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/*
* Copyright (c) 2018-2021, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*
*/
/**
* \file
* \brief Platform Security Architecture cryptography module
*/
#ifndef PSA_CRYPTO_H
#define PSA_CRYPTO_H
#include <stddef.h>
#ifdef __DOXYGEN_ONLY__
/* This __DOXYGEN_ONLY__ block contains mock definitions for things that
* must be defined in the crypto_platform.h header. These mock definitions
* are present in this file as a convenience to generate pretty-printed
* documentation that includes those definitions. */
/** \defgroup platform Implementation-specific definitions
* @{
*/
/**@}*/
#endif /* __DOXYGEN_ONLY__ */
#ifdef __cplusplus
extern "C" {
#endif
/* The file "crypto_types.h" declares types that encode errors,
* algorithms, key types, policies, etc. */
#include "psa/crypto_types.h"
/** \defgroup version API version
* @{
*/
/**
* The major version of this implementation of the PSA Crypto API
*/
#define PSA_CRYPTO_API_VERSION_MAJOR 1
/**
* The minor version of this implementation of the PSA Crypto API
*/
#define PSA_CRYPTO_API_VERSION_MINOR 0
/**@}*/
/* The file "crypto_values.h" declares macros to build and analyze values
* of integral types defined in "crypto_types.h". */
#include "psa/crypto_values.h"
/** \defgroup initialization Library initialization
* @{
*/
/**
* \brief Library initialization.
*
* Applications must call this function before calling any other
* function in this module.
*
* Applications may call this function more than once. Once a call
* succeeds, subsequent calls are guaranteed to succeed.
*
* If the application calls other functions before calling psa_crypto_init(),
* the behavior is undefined. Implementations are encouraged to either perform
* the operation as if the library had been initialized or to return
* #PSA_ERROR_BAD_STATE or some other applicable error. In particular,
* implementations should not return a success status if the lack of
* initialization may have security implications, for example due to improper
* seeding of the random number generator.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_INSUFFICIENT_STORAGE
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_DATA_INVALID
* \retval #PSA_ERROR_DATA_CORRUPT
*/
psa_status_t psa_crypto_init(void);
/**@}*/
/** \addtogroup attributes
* @{
*/
/** Return an initial value for a key attributes structure.
*/
static psa_key_attributes_t psa_key_attributes_init(void);
/** Declare a key as persistent and set its key identifier.
*
* If the attribute structure currently declares the key as volatile (which
* is the default content of an attribute structure), this function sets
* the lifetime attribute to #PSA_KEY_LIFETIME_PERSISTENT.
*
* This function does not access storage, it merely stores the given
* value in the structure.
* The persistent key will be written to storage when the attribute
* structure is passed to a key creation function such as
* psa_import_key(), psa_generate_key(),
* psa_key_derivation_output_key() or psa_copy_key().
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate each of its arguments exactly once.
*
* \param[out] attributes The attribute structure to write to.
* \param key The persistent identifier for the key.
*/
static void psa_set_key_id(psa_key_attributes_t *attributes,
psa_key_id_t key);
/** Set the location of a persistent key.
*
* To make a key persistent, you must give it a persistent key identifier
* with psa_set_key_id(). By default, a key that has a persistent identifier
* is stored in the default storage area identifier by
* #PSA_KEY_LIFETIME_PERSISTENT. Call this function to choose a storage
* area, or to explicitly declare the key as volatile.
*
* This function does not access storage, it merely stores the given
* value in the structure.
* The persistent key will be written to storage when the attribute
* structure is passed to a key creation function such as
* psa_import_key(), psa_generate_key(),
* psa_key_derivation_output_key() or psa_copy_key().
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate each of its arguments exactly once.
*
* \param[out] attributes The attribute structure to write to.
* \param lifetime The lifetime for the key.
* If this is #PSA_KEY_LIFETIME_VOLATILE, the
* key will be volatile, and the key identifier
* attribute is reset to 0.
*/
static void psa_set_key_lifetime(psa_key_attributes_t *attributes,
psa_key_lifetime_t lifetime);
/** Retrieve the key identifier from key attributes.
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate its argument exactly once.
*
* \param[in] attributes The key attribute structure to query.
*
* \return The persistent identifier stored in the attribute structure.
* This value is unspecified if the attribute structure declares
* the key as volatile.
*/
static psa_key_id_t psa_get_key_id(const psa_key_attributes_t *attributes);
/** Retrieve the lifetime from key attributes.
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate its argument exactly once.
*
* \param[in] attributes The key attribute structure to query.
*
* \return The lifetime value stored in the attribute structure.
*/
static psa_key_lifetime_t psa_get_key_lifetime(
const psa_key_attributes_t *attributes);
/** Declare usage flags for a key.
*
* Usage flags are part of a key's usage policy. They encode what
* kind of operations are permitted on the key. For more details,
* refer to the documentation of the type #psa_key_usage_t.
*
* This function overwrites any usage flags
* previously set in \p attributes.
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate each of its arguments exactly once.
*
* \param[out] attributes The attribute structure to write to.
* \param usage_flags The usage flags to write.
*/
static void psa_set_key_usage_flags(psa_key_attributes_t *attributes,
psa_key_usage_t usage_flags);
/** Retrieve the usage flags from key attributes.
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate its argument exactly once.
*
* \param[in] attributes The key attribute structure to query.
*
* \return The usage flags stored in the attribute structure.
*/
static psa_key_usage_t psa_get_key_usage_flags(
const psa_key_attributes_t *attributes);
/** Declare the permitted algorithm policy for a key.
*
* The permitted algorithm policy of a key encodes which algorithm or
* algorithms are permitted to be used with this key. The following
* algorithm policies are supported:
* - 0 does not allow any cryptographic operation with the key. The key
* may be used for non-cryptographic actions such as exporting (if
* permitted by the usage flags).
* - An algorithm value permits this particular algorithm.
* - An algorithm wildcard built from #PSA_ALG_ANY_HASH allows the specified
* signature scheme with any hash algorithm.
* - An algorithm built from #PSA_ALG_AT_LEAST_THIS_LENGTH_MAC allows
* any MAC algorithm from the same base class (e.g. CMAC) which
* generates/verifies a MAC length greater than or equal to the length
* encoded in the wildcard algorithm.
* - An algorithm built from #PSA_ALG_AEAD_WITH_AT_LEAST_THIS_LENGTH_TAG
* allows any AEAD algorithm from the same base class (e.g. CCM) which
* generates/verifies a tag length greater than or equal to the length
* encoded in the wildcard algorithm.
*
* This function overwrites any algorithm policy
* previously set in \p attributes.
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate each of its arguments exactly once.
*
* \param[out] attributes The attribute structure to write to.
* \param alg The permitted algorithm policy to write.
*/
static void psa_set_key_algorithm(psa_key_attributes_t *attributes,
psa_algorithm_t alg);
/** Retrieve the algorithm policy from key attributes.
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate its argument exactly once.
*
* \param[in] attributes The key attribute structure to query.
*
* \return The algorithm stored in the attribute structure.
*/
static psa_algorithm_t psa_get_key_algorithm(
const psa_key_attributes_t *attributes);
/** Declare the type of a key.
*
* This function overwrites any key type
* previously set in \p attributes.
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate each of its arguments exactly once.
*
* \param[out] attributes The attribute structure to write to.
* \param type The key type to write.
* If this is 0, the key type in \p attributes
* becomes unspecified.
*/
static void psa_set_key_type(psa_key_attributes_t *attributes,
psa_key_type_t type);
/** Declare the size of a key.
*
* This function overwrites any key size previously set in \p attributes.
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate each of its arguments exactly once.
*
* \param[out] attributes The attribute structure to write to.
* \param bits The key size in bits.
* If this is 0, the key size in \p attributes
* becomes unspecified. Keys of size 0 are
* not supported.
*/
static void psa_set_key_bits(psa_key_attributes_t *attributes,
size_t bits);
/** Retrieve the key type from key attributes.
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate its argument exactly once.
*
* \param[in] attributes The key attribute structure to query.
*
* \return The key type stored in the attribute structure.
*/
static psa_key_type_t psa_get_key_type(const psa_key_attributes_t *attributes);
/** Retrieve the key size from key attributes.
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate its argument exactly once.
*
* \param[in] attributes The key attribute structure to query.
*
* \return The key size stored in the attribute structure, in bits.
*/
static size_t psa_get_key_bits(const psa_key_attributes_t *attributes);
/** Retrieve the attributes of a key.
*
* This function first resets the attribute structure as with
* psa_reset_key_attributes(). It then copies the attributes of
* the given key into the given attribute structure.
*
* \note This function may allocate memory or other resources.
* Once you have called this function on an attribute structure,
* you must call psa_reset_key_attributes() to free these resources.
*
* \param[in] key Identifier of the key to query.
* \param[in,out] attributes On success, the attributes of the key.
* On failure, equivalent to a
* freshly-initialized structure.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_DATA_CORRUPT
* \retval #PSA_ERROR_DATA_INVALID
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_get_key_attributes(psa_key_id_t key,
psa_key_attributes_t *attributes);
/** Reset a key attribute structure to a freshly initialized state.
*
* You must initialize the attribute structure as described in the
* documentation of the type #psa_key_attributes_t before calling this
* function. Once the structure has been initialized, you may call this
* function at any time.
*
* This function frees any auxiliary resources that the structure
* may contain.
*
* \param[in,out] attributes The attribute structure to reset.
*/
void psa_reset_key_attributes(psa_key_attributes_t *attributes);
/**@}*/
/** \defgroup key_management Key management
* @{
*/
/** Remove non-essential copies of key material from memory.
*
* If the key identifier designates a volatile key, this functions does not do
* anything and returns successfully.
*
* If the key identifier designates a persistent key, then this function will
* free all resources associated with the key in volatile memory. The key
* data in persistent storage is not affected and the key can still be used.
*
* \param key Identifier of the key to purge.
*
* \retval #PSA_SUCCESS
* The key material will have been removed from memory if it is not
* currently required.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p key is not a valid key identifier.
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_purge_key(psa_key_id_t key);
/** Make a copy of a key.
*
* Copy key material from one location to another.
*
* This function is primarily useful to copy a key from one location
* to another, since it populates a key using the material from
* another key which may have a different lifetime.
*
* This function may be used to share a key with a different party,
* subject to implementation-defined restrictions on key sharing.
*
* The policy on the source key must have the usage flag
* #PSA_KEY_USAGE_COPY set.
* This flag is sufficient to permit the copy if the key has the lifetime
* #PSA_KEY_LIFETIME_VOLATILE or #PSA_KEY_LIFETIME_PERSISTENT.
* Some secure elements do not provide a way to copy a key without
* making it extractable from the secure element. If a key is located
* in such a secure element, then the key must have both usage flags
* #PSA_KEY_USAGE_COPY and #PSA_KEY_USAGE_EXPORT in order to make
* a copy of the key outside the secure element.
*
* The resulting key may only be used in a way that conforms to
* both the policy of the original key and the policy specified in
* the \p attributes parameter:
* - The usage flags on the resulting key are the bitwise-and of the
* usage flags on the source policy and the usage flags in \p attributes.
* - If both allow the same algorithm or wildcard-based
* algorithm policy, the resulting key has the same algorithm policy.
* - If either of the policies allows an algorithm and the other policy
* allows a wildcard-based algorithm policy that includes this algorithm,
* the resulting key allows the same algorithm.
* - If the policies do not allow any algorithm in common, this function
* fails with the status #PSA_ERROR_INVALID_ARGUMENT.
*
* The effect of this function on implementation-defined attributes is
* implementation-defined.
*
* \param source_key The key to copy. It must allow the usage
* #PSA_KEY_USAGE_COPY. If a private or secret key is
* being copied outside of a secure element it must
* also allow #PSA_KEY_USAGE_EXPORT.
* \param[in] attributes The attributes for the new key.
* They are used as follows:
* - The key type and size may be 0. If either is
* nonzero, it must match the corresponding
* attribute of the source key.
* - The key location (the lifetime and, for
* persistent keys, the key identifier) is
* used directly.
* - The policy constraints (usage flags and
* algorithm policy) are combined from
* the source key and \p attributes so that
* both sets of restrictions apply, as
* described in the documentation of this function.
* \param[out] target_key On success, an identifier for the newly created
* key. For persistent keys, this is the key
* identifier defined in \p attributes.
* \c 0 on failure.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INVALID_HANDLE
* \p source_key is invalid.
* \retval #PSA_ERROR_ALREADY_EXISTS
* This is an attempt to create a persistent key, and there is
* already a persistent key with the given identifier.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The lifetime or identifier in \p attributes are invalid.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The policy constraints on the source and specified in
* \p attributes are incompatible.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p attributes specifies a key type or key size
* which does not match the attributes of the source key.
* \retval #PSA_ERROR_NOT_PERMITTED
* The source key does not have the #PSA_KEY_USAGE_COPY usage flag.
* \retval #PSA_ERROR_NOT_PERMITTED
* The source key is not exportable and its lifetime does not
* allow copying it to the target's lifetime.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_INSUFFICIENT_STORAGE
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_DATA_INVALID
* \retval #PSA_ERROR_DATA_CORRUPT
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_copy_key(psa_key_id_t source_key,
const psa_key_attributes_t *attributes,
psa_key_id_t *target_key);
/**
* \brief Destroy a key.
*
* This function destroys a key from both volatile
* memory and, if applicable, non-volatile storage. Implementations shall
* make a best effort to ensure that that the key material cannot be recovered.
*
* This function also erases any metadata such as policies and frees
* resources associated with the key.
*
* If a key is currently in use in a multipart operation, then destroying the
* key will cause the multipart operation to fail.
*
* \param key Identifier of the key to erase. If this is \c 0, do nothing and
* return #PSA_SUCCESS.
*
* \retval #PSA_SUCCESS
* \p key was a valid identifier and the key material that it
* referred to has been erased. Alternatively, \p key is \c 0.
* \retval #PSA_ERROR_NOT_PERMITTED
* The key cannot be erased because it is
* read-only, either due to a policy or due to physical restrictions.
* \retval #PSA_ERROR_INVALID_HANDLE
* \p key is not a valid identifier nor \c 0.
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* There was an failure in communication with the cryptoprocessor.
* The key material may still be present in the cryptoprocessor.
* \retval #PSA_ERROR_DATA_INVALID
* This error is typically a result of either storage corruption on a
* cleartext storage backend, or an attempt to read data that was
* written by an incompatible version of the library.
* \retval #PSA_ERROR_STORAGE_FAILURE
* The storage is corrupted. Implementations shall make a best effort
* to erase key material even in this stage, however applications
* should be aware that it may be impossible to guarantee that the
* key material is not recoverable in such cases.
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* An unexpected condition which is not a storage corruption or
* a communication failure occurred. The cryptoprocessor may have
* been compromised.
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_destroy_key(psa_key_id_t key);
/**@}*/
/** \defgroup import_export Key import and export
* @{
*/
/**
* \brief Import a key in binary format.
*
* This function supports any output from psa_export_key(). Refer to the
* documentation of psa_export_public_key() for the format of public keys
* and to the documentation of psa_export_key() for the format for
* other key types.
*
* The key data determines the key size. The attributes may optionally
* specify a key size; in this case it must match the size determined
* from the key data. A key size of 0 in \p attributes indicates that
* the key size is solely determined by the key data.
*
* Implementations must reject an attempt to import a key of size 0.
*
* This specification supports a single format for each key type.
* Implementations may support other formats as long as the standard
* format is supported. Implementations that support other formats
* should ensure that the formats are clearly unambiguous so as to
* minimize the risk that an invalid input is accidentally interpreted
* according to a different format.
*
* \param[in] attributes The attributes for the new key.
* The key size is always determined from the
* \p data buffer.
* If the key size in \p attributes is nonzero,
* it must be equal to the size from \p data.
* \param[out] key On success, an identifier to the newly created key.
* For persistent keys, this is the key identifier
* defined in \p attributes.
* \c 0 on failure.
* \param[in] data Buffer containing the key data. The content of this
* buffer is interpreted according to the type declared
* in \p attributes.
* All implementations must support at least the format
* described in the documentation
* of psa_export_key() or psa_export_public_key() for
* the chosen type. Implementations may allow other
* formats, but should be conservative: implementations
* should err on the side of rejecting content if it
* may be erroneous (e.g. wrong type or truncated data).
* \param data_length Size of the \p data buffer in bytes.
*
* \retval #PSA_SUCCESS
* Success.
* If the key is persistent, the key material and the key's metadata
* have been saved to persistent storage.
* \retval #PSA_ERROR_ALREADY_EXISTS
* This is an attempt to create a persistent key, and there is
* already a persistent key with the given identifier.
* \retval #PSA_ERROR_NOT_SUPPORTED
* The key type or key size is not supported, either by the
* implementation in general or in this particular persistent location.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The key attributes, as a whole, are invalid.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The key data is not correctly formatted.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The size in \p attributes is nonzero and does not match the size
* of the key data.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_INSUFFICIENT_STORAGE
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_DATA_CORRUPT
* \retval #PSA_ERROR_DATA_INVALID
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_import_key(const psa_key_attributes_t *attributes,
const uint8_t *data,
size_t data_length,
psa_key_id_t *key);
/**
* \brief Export a key in binary format.
*
* The output of this function can be passed to psa_import_key() to
* create an equivalent object.
*
* If the implementation of psa_import_key() supports other formats
* beyond the format specified here, the output from psa_export_key()
* must use the representation specified here, not the original
* representation.
*
* For standard key types, the output format is as follows:
*
* - For symmetric keys (including MAC keys), the format is the
* raw bytes of the key.
* - For DES, the key data consists of 8 bytes. The parity bits must be
* correct.
* - For Triple-DES, the format is the concatenation of the
* two or three DES keys.
* - For RSA key pairs (#PSA_KEY_TYPE_RSA_KEY_PAIR), the format
* is the non-encrypted DER encoding of the representation defined by
* PKCS\#1 (RFC 8017) as `RSAPrivateKey`, version 0.
* ```
* RSAPrivateKey ::= SEQUENCE {
* version INTEGER, -- must be 0
* modulus INTEGER, -- n
* publicExponent INTEGER, -- e
* privateExponent INTEGER, -- d
* prime1 INTEGER, -- p
* prime2 INTEGER, -- q
* exponent1 INTEGER, -- d mod (p-1)
* exponent2 INTEGER, -- d mod (q-1)
* coefficient INTEGER, -- (inverse of q) mod p
* }
* ```
* - For elliptic curve key pairs (key types for which
* #PSA_KEY_TYPE_IS_ECC_KEY_PAIR is true), the format is
* a representation of the private value as a `ceiling(m/8)`-byte string
* where `m` is the bit size associated with the curve, i.e. the bit size
* of the order of the curve's coordinate field. This byte string is
* in little-endian order for Montgomery curves (curve types
* `PSA_ECC_FAMILY_CURVEXXX`), and in big-endian order for Weierstrass
* curves (curve types `PSA_ECC_FAMILY_SECTXXX`, `PSA_ECC_FAMILY_SECPXXX`
* and `PSA_ECC_FAMILY_BRAINPOOL_PXXX`).
* For Weierstrass curves, this is the content of the `privateKey` field of
* the `ECPrivateKey` format defined by RFC 5915. For Montgomery curves,
* the format is defined by RFC 7748, and output is masked according to ยง5.
* For twisted Edwards curves, the private key is as defined by RFC 8032
* (a 32-byte string for Edwards25519, a 57-byte string for Edwards448).
* - For Diffie-Hellman key exchange key pairs (key types for which
* #PSA_KEY_TYPE_IS_DH_KEY_PAIR is true), the
* format is the representation of the private key `x` as a big-endian byte
* string. The length of the byte string is the private key size in bytes
* (leading zeroes are not stripped).
* - For public keys (key types for which #PSA_KEY_TYPE_IS_PUBLIC_KEY is
* true), the format is the same as for psa_export_public_key().
*
* The policy on the key must have the usage flag #PSA_KEY_USAGE_EXPORT set.
*
* \param key Identifier of the key to export. It must allow the
* usage #PSA_KEY_USAGE_EXPORT, unless it is a public
* key.
* \param[out] data Buffer where the key data is to be written.
* \param data_size Size of the \p data buffer in bytes.
* \param[out] data_length On success, the number of bytes
* that make up the key data.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* The key does not have the #PSA_KEY_USAGE_EXPORT flag.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p data buffer is too small. You can determine a
* sufficient buffer size by calling
* #PSA_EXPORT_KEY_OUTPUT_SIZE(\c type, \c bits)
* where \c type is the key type
* and \c bits is the key size in bits.
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_export_key(psa_key_id_t key,
uint8_t *data,
size_t data_size,
size_t *data_length);
/**
* \brief Export a public key or the public part of a key pair in binary format.
*
* The output of this function can be passed to psa_import_key() to
* create an object that is equivalent to the public key.
*
* This specification supports a single format for each key type.
* Implementations may support other formats as long as the standard
* format is supported. Implementations that support other formats
* should ensure that the formats are clearly unambiguous so as to
* minimize the risk that an invalid input is accidentally interpreted
* according to a different format.
*
* For standard key types, the output format is as follows:
* - For RSA public keys (#PSA_KEY_TYPE_RSA_PUBLIC_KEY), the DER encoding of
* the representation defined by RFC 3279 §2.3.1 as `RSAPublicKey`.
* ```
* RSAPublicKey ::= SEQUENCE {
* modulus INTEGER, -- n
* publicExponent INTEGER } -- e
* ```
* - For elliptic curve keys on a twisted Edwards curve (key types for which
* #PSA_KEY_TYPE_IS_ECC_PUBLIC_KEY is true and #PSA_KEY_TYPE_ECC_GET_FAMILY
* returns #PSA_ECC_FAMILY_TWISTED_EDWARDS), the public key is as defined
* by RFC 8032
* (a 32-byte string for Edwards25519, a 57-byte string for Edwards448).
* - For other elliptic curve public keys (key types for which
* #PSA_KEY_TYPE_IS_ECC_PUBLIC_KEY is true), the format is the uncompressed
* representation defined by SEC1 §2.3.3 as the content of an ECPoint.
* Let `m` be the bit size associated with the curve, i.e. the bit size of
* `q` for a curve over `F_q`. The representation consists of:
* - The byte 0x04;
* - `x_P` as a `ceiling(m/8)`-byte string, big-endian;
* - `y_P` as a `ceiling(m/8)`-byte string, big-endian.
* - For Diffie-Hellman key exchange public keys (key types for which
* #PSA_KEY_TYPE_IS_DH_PUBLIC_KEY is true),
* the format is the representation of the public key `y = g^x mod p` as a
* big-endian byte string. The length of the byte string is the length of the
* base prime `p` in bytes.
*
* Exporting a public key object or the public part of a key pair is
* always permitted, regardless of the key's usage flags.
*
* \param key Identifier of the key to export.
* \param[out] data Buffer where the key data is to be written.
* \param data_size Size of the \p data buffer in bytes.
* \param[out] data_length On success, the number of bytes
* that make up the key data.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The key is neither a public key nor a key pair.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p data buffer is too small. You can determine a
* sufficient buffer size by calling
* #PSA_EXPORT_KEY_OUTPUT_SIZE(#PSA_KEY_TYPE_PUBLIC_KEY_OF_KEY_PAIR(\c type), \c bits)
* where \c type is the key type
* and \c bits is the key size in bits.
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_export_public_key(psa_key_id_t key,
uint8_t *data,
size_t data_size,
size_t *data_length);
/**@}*/
/** \defgroup hash Message digests
* @{
*/
/** Calculate the hash (digest) of a message.
*
* \note To verify the hash of a message against an
* expected value, use psa_hash_compare() instead.
*
* \param alg The hash algorithm to compute (\c PSA_ALG_XXX value
* such that #PSA_ALG_IS_HASH(\p alg) is true).
* \param[in] input Buffer containing the message to hash.
* \param input_length Size of the \p input buffer in bytes.
* \param[out] hash Buffer where the hash is to be written.
* \param hash_size Size of the \p hash buffer in bytes.
* \param[out] hash_length On success, the number of bytes
* that make up the hash value. This is always
* #PSA_HASH_LENGTH(\p alg).
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not a hash algorithm.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* \p hash_size is too small
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_hash_compute(psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
uint8_t *hash,
size_t hash_size,
size_t *hash_length);
/** Calculate the hash (digest) of a message and compare it with a
* reference value.
*
* \param alg The hash algorithm to compute (\c PSA_ALG_XXX value
* such that #PSA_ALG_IS_HASH(\p alg) is true).
* \param[in] input Buffer containing the message to hash.
* \param input_length Size of the \p input buffer in bytes.
* \param[out] hash Buffer containing the expected hash value.
* \param hash_length Size of the \p hash buffer in bytes.
*
* \retval #PSA_SUCCESS
* The expected hash is identical to the actual hash of the input.
* \retval #PSA_ERROR_INVALID_SIGNATURE
* The hash of the message was calculated successfully, but it
* differs from the expected hash.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not a hash algorithm.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p input_length or \p hash_length do not match the hash size for \p alg
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_hash_compare(psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
const uint8_t *hash,
size_t hash_length);
/** The type of the state data structure for multipart hash operations.
*
* Before calling any function on a hash operation object, the application must
* initialize it by any of the following means:
* - Set the structure to all-bits-zero, for example:
* \code
* psa_hash_operation_t operation;
* memset(&operation, 0, sizeof(operation));
* \endcode
* - Initialize the structure to logical zero values, for example:
* \code
* psa_hash_operation_t operation = {0};
* \endcode
* - Initialize the structure to the initializer #PSA_HASH_OPERATION_INIT,
* for example:
* \code
* psa_hash_operation_t operation = PSA_HASH_OPERATION_INIT;
* \endcode
* - Assign the result of the function psa_hash_operation_init()
* to the structure, for example:
* \code
* psa_hash_operation_t operation;
* operation = psa_hash_operation_init();
* \endcode
*
* This is an implementation-defined \c struct. Applications should not
* make any assumptions about the content of this structure.
* Implementation details can change in future versions without notice. */
typedef struct psa_hash_operation_s psa_hash_operation_t;
/** Return an initial value for a hash operation object.
*/
static psa_hash_operation_t psa_hash_operation_init(void);
/** Set up a multipart hash operation.
*
* The sequence of operations to calculate a hash (message digest)
* is as follows:
* -# Allocate an operation object which will be passed to all the functions
* listed here.
* -# Initialize the operation object with one of the methods described in the
* documentation for #psa_hash_operation_t, e.g. #PSA_HASH_OPERATION_INIT.
* -# Call psa_hash_setup() to specify the algorithm.
* -# Call psa_hash_update() zero, one or more times, passing a fragment
* of the message each time. The hash that is calculated is the hash
* of the concatenation of these messages in order.
* -# To calculate the hash, call psa_hash_finish().
* To compare the hash with an expected value, call psa_hash_verify().
*
* If an error occurs at any step after a call to psa_hash_setup(), the
* operation will need to be reset by a call to psa_hash_abort(). The
* application may call psa_hash_abort() at any time after the operation
* has been initialized.
*
* After a successful call to psa_hash_setup(), the application must
* eventually terminate the operation. The following events terminate an
* operation:
* - A successful call to psa_hash_finish() or psa_hash_verify().
* - A call to psa_hash_abort().
*
* \param[in,out] operation The operation object to set up. It must have
* been initialized as per the documentation for
* #psa_hash_operation_t and not yet in use.
* \param alg The hash algorithm to compute (\c PSA_ALG_XXX value
* such that #PSA_ALG_IS_HASH(\p alg) is true).
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not a supported hash algorithm.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p alg is not a hash algorithm.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be inactive).
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_hash_setup(psa_hash_operation_t *operation,
psa_algorithm_t alg);
/** Add a message fragment to a multipart hash operation.
*
* The application must call psa_hash_setup() before calling this function.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_hash_abort().
*
* \param[in,out] operation Active hash operation.
* \param[in] input Buffer containing the message fragment to hash.
* \param input_length Size of the \p input buffer in bytes.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it muct be active).
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_hash_update(psa_hash_operation_t *operation,
const uint8_t *input,
size_t input_length);
/** Finish the calculation of the hash of a message.
*
* The application must call psa_hash_setup() before calling this function.
* This function calculates the hash of the message formed by concatenating
* the inputs passed to preceding calls to psa_hash_update().
*
* When this function returns successfuly, the operation becomes inactive.
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_hash_abort().
*
* \warning Applications should not call this function if they expect
* a specific value for the hash. Call psa_hash_verify() instead.
* Beware that comparing integrity or authenticity data such as
* hash values with a function such as \c memcmp is risky
* because the time taken by the comparison may leak information
* about the hashed data which could allow an attacker to guess
* a valid hash and thereby bypass security controls.
*
* \param[in,out] operation Active hash operation.
* \param[out] hash Buffer where the hash is to be written.
* \param hash_size Size of the \p hash buffer in bytes.
* \param[out] hash_length On success, the number of bytes
* that make up the hash value. This is always
* #PSA_HASH_LENGTH(\c alg) where \c alg is the
* hash algorithm that is calculated.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active).
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p hash buffer is too small. You can determine a
* sufficient buffer size by calling #PSA_HASH_LENGTH(\c alg)
* where \c alg is the hash algorithm that is calculated.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_hash_finish(psa_hash_operation_t *operation,
uint8_t *hash,
size_t hash_size,
size_t *hash_length);
/** Finish the calculation of the hash of a message and compare it with
* an expected value.
*
* The application must call psa_hash_setup() before calling this function.
* This function calculates the hash of the message formed by concatenating
* the inputs passed to preceding calls to psa_hash_update(). It then
* compares the calculated hash with the expected hash passed as a
* parameter to this function.
*
* When this function returns successfuly, the operation becomes inactive.
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_hash_abort().
*
* \note Implementations shall make the best effort to ensure that the
* comparison between the actual hash and the expected hash is performed
* in constant time.
*
* \param[in,out] operation Active hash operation.
* \param[in] hash Buffer containing the expected hash value.
* \param hash_length Size of the \p hash buffer in bytes.
*
* \retval #PSA_SUCCESS
* The expected hash is identical to the actual hash of the message.
* \retval #PSA_ERROR_INVALID_SIGNATURE
* The hash of the message was calculated successfully, but it
* differs from the expected hash.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active).
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_hash_verify(psa_hash_operation_t *operation,
const uint8_t *hash,
size_t hash_length);
/** Abort a hash operation.
*
* Aborting an operation frees all associated resources except for the
* \p operation structure itself. Once aborted, the operation object
* can be reused for another operation by calling
* psa_hash_setup() again.
*
* You may call this function any time after the operation object has
* been initialized by one of the methods described in #psa_hash_operation_t.
*
* In particular, calling psa_hash_abort() after the operation has been
* terminated by a call to psa_hash_abort(), psa_hash_finish() or
* psa_hash_verify() is safe and has no effect.
*
* \param[in,out] operation Initialized hash operation.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_hash_abort(psa_hash_operation_t *operation);
/** Clone a hash operation.
*
* This function copies the state of an ongoing hash operation to
* a new operation object. In other words, this function is equivalent
* to calling psa_hash_setup() on \p target_operation with the same
* algorithm that \p source_operation was set up for, then
* psa_hash_update() on \p target_operation with the same input that
* that was passed to \p source_operation. After this function returns, the
* two objects are independent, i.e. subsequent calls involving one of
* the objects do not affect the other object.
*
* \param[in] source_operation The active hash operation to clone.
* \param[in,out] target_operation The operation object to set up.
* It must be initialized but not active.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_BAD_STATE
* The \p source_operation state is not valid (it must be active).
* \retval #PSA_ERROR_BAD_STATE
* The \p target_operation state is not valid (it must be inactive).
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_hash_clone(const psa_hash_operation_t *source_operation,
psa_hash_operation_t *target_operation);
/**@}*/
/** \defgroup MAC Message authentication codes
* @{
*/
/** Calculate the MAC (message authentication code) of a message.
*
* \note To verify the MAC of a message against an
* expected value, use psa_mac_verify() instead.
* Beware that comparing integrity or authenticity data such as
* MAC values with a function such as \c memcmp is risky
* because the time taken by the comparison may leak information
* about the MAC value which could allow an attacker to guess
* a valid MAC and thereby bypass security controls.
*
* \param key Identifier of the key to use for the operation. It
* must allow the usage PSA_KEY_USAGE_SIGN_MESSAGE.
* \param alg The MAC algorithm to compute (\c PSA_ALG_XXX value
* such that #PSA_ALG_IS_MAC(\p alg) is true).
* \param[in] input Buffer containing the input message.
* \param input_length Size of the \p input buffer in bytes.
* \param[out] mac Buffer where the MAC value is to be written.
* \param mac_size Size of the \p mac buffer in bytes.
* \param[out] mac_length On success, the number of bytes
* that make up the MAC value.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p key is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not a MAC algorithm.
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* \p mac_size is too small
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* The key could not be retrieved from storage.
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_mac_compute(psa_key_id_t key,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
uint8_t *mac,
size_t mac_size,
size_t *mac_length);
/** Calculate the MAC of a message and compare it with a reference value.
*
* \param key Identifier of the key to use for the operation. It
* must allow the usage PSA_KEY_USAGE_VERIFY_MESSAGE.
* \param alg The MAC algorithm to compute (\c PSA_ALG_XXX value
* such that #PSA_ALG_IS_MAC(\p alg) is true).
* \param[in] input Buffer containing the input message.
* \param input_length Size of the \p input buffer in bytes.
* \param[out] mac Buffer containing the expected MAC value.
* \param mac_length Size of the \p mac buffer in bytes.
*
* \retval #PSA_SUCCESS
* The expected MAC is identical to the actual MAC of the input.
* \retval #PSA_ERROR_INVALID_SIGNATURE
* The MAC of the message was calculated successfully, but it
* differs from the expected value.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p key is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not a MAC algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* The key could not be retrieved from storage.
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_mac_verify(psa_key_id_t key,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
const uint8_t *mac,
size_t mac_length);
/** The type of the state data structure for multipart MAC operations.
*
* Before calling any function on a MAC operation object, the application must
* initialize it by any of the following means:
* - Set the structure to all-bits-zero, for example:
* \code
* psa_mac_operation_t operation;
* memset(&operation, 0, sizeof(operation));
* \endcode
* - Initialize the structure to logical zero values, for example:
* \code
* psa_mac_operation_t operation = {0};
* \endcode
* - Initialize the structure to the initializer #PSA_MAC_OPERATION_INIT,
* for example:
* \code
* psa_mac_operation_t operation = PSA_MAC_OPERATION_INIT;
* \endcode
* - Assign the result of the function psa_mac_operation_init()
* to the structure, for example:
* \code
* psa_mac_operation_t operation;
* operation = psa_mac_operation_init();
* \endcode
*
*
* This is an implementation-defined \c struct. Applications should not
* make any assumptions about the content of this structure.
* Implementation details can change in future versions without notice. */
typedef struct psa_mac_operation_s psa_mac_operation_t;
/** Return an initial value for a MAC operation object.
*/
static psa_mac_operation_t psa_mac_operation_init(void);
/** Set up a multipart MAC calculation operation.
*
* This function sets up the calculation of the MAC
* (message authentication code) of a byte string.
* To verify the MAC of a message against an
* expected value, use psa_mac_verify_setup() instead.
*
* The sequence of operations to calculate a MAC is as follows:
* -# Allocate an operation object which will be passed to all the functions
* listed here.
* -# Initialize the operation object with one of the methods described in the
* documentation for #psa_mac_operation_t, e.g. #PSA_MAC_OPERATION_INIT.
* -# Call psa_mac_sign_setup() to specify the algorithm and key.
* -# Call psa_mac_update() zero, one or more times, passing a fragment
* of the message each time. The MAC that is calculated is the MAC
* of the concatenation of these messages in order.
* -# At the end of the message, call psa_mac_sign_finish() to finish
* calculating the MAC value and retrieve it.
*
* If an error occurs at any step after a call to psa_mac_sign_setup(), the
* operation will need to be reset by a call to psa_mac_abort(). The
* application may call psa_mac_abort() at any time after the operation
* has been initialized.
*
* After a successful call to psa_mac_sign_setup(), the application must
* eventually terminate the operation through one of the following methods:
* - A successful call to psa_mac_sign_finish().
* - A call to psa_mac_abort().
*
* \param[in,out] operation The operation object to set up. It must have
* been initialized as per the documentation for
* #psa_mac_operation_t and not yet in use.
* \param key Identifier of the key to use for the operation. It
* must remain valid until the operation terminates.
* It must allow the usage PSA_KEY_USAGE_SIGN_MESSAGE.
* \param alg The MAC algorithm to compute (\c PSA_ALG_XXX value
* such that #PSA_ALG_IS_MAC(\p alg) is true).
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p key is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not a MAC algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* The key could not be retrieved from storage.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be inactive).
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_mac_sign_setup(psa_mac_operation_t *operation,
psa_key_id_t key,
psa_algorithm_t alg);
/** Set up a multipart MAC verification operation.
*
* This function sets up the verification of the MAC
* (message authentication code) of a byte string against an expected value.
*
* The sequence of operations to verify a MAC is as follows:
* -# Allocate an operation object which will be passed to all the functions
* listed here.
* -# Initialize the operation object with one of the methods described in the
* documentation for #psa_mac_operation_t, e.g. #PSA_MAC_OPERATION_INIT.
* -# Call psa_mac_verify_setup() to specify the algorithm and key.
* -# Call psa_mac_update() zero, one or more times, passing a fragment
* of the message each time. The MAC that is calculated is the MAC
* of the concatenation of these messages in order.
* -# At the end of the message, call psa_mac_verify_finish() to finish
* calculating the actual MAC of the message and verify it against
* the expected value.
*
* If an error occurs at any step after a call to psa_mac_verify_setup(), the
* operation will need to be reset by a call to psa_mac_abort(). The
* application may call psa_mac_abort() at any time after the operation
* has been initialized.
*
* After a successful call to psa_mac_verify_setup(), the application must
* eventually terminate the operation through one of the following methods:
* - A successful call to psa_mac_verify_finish().
* - A call to psa_mac_abort().
*
* \param[in,out] operation The operation object to set up. It must have
* been initialized as per the documentation for
* #psa_mac_operation_t and not yet in use.
* \param key Identifier of the key to use for the operation. It
* must remain valid until the operation terminates.
* It must allow the usage
* PSA_KEY_USAGE_VERIFY_MESSAGE.
* \param alg The MAC algorithm to compute (\c PSA_ALG_XXX value
* such that #PSA_ALG_IS_MAC(\p alg) is true).
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \c key is not compatible with \c alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \c alg is not supported or is not a MAC algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* The key could not be retrieved from storage
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be inactive).
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_mac_verify_setup(psa_mac_operation_t *operation,
psa_key_id_t key,
psa_algorithm_t alg);
/** Add a message fragment to a multipart MAC operation.
*
* The application must call psa_mac_sign_setup() or psa_mac_verify_setup()
* before calling this function.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_mac_abort().
*
* \param[in,out] operation Active MAC operation.
* \param[in] input Buffer containing the message fragment to add to
* the MAC calculation.
* \param input_length Size of the \p input buffer in bytes.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active).
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_mac_update(psa_mac_operation_t *operation,
const uint8_t *input,
size_t input_length);
/** Finish the calculation of the MAC of a message.
*
* The application must call psa_mac_sign_setup() before calling this function.
* This function calculates the MAC of the message formed by concatenating
* the inputs passed to preceding calls to psa_mac_update().
*
* When this function returns successfuly, the operation becomes inactive.
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_mac_abort().
*
* \warning Applications should not call this function if they expect
* a specific value for the MAC. Call psa_mac_verify_finish() instead.
* Beware that comparing integrity or authenticity data such as
* MAC values with a function such as \c memcmp is risky
* because the time taken by the comparison may leak information
* about the MAC value which could allow an attacker to guess
* a valid MAC and thereby bypass security controls.
*
* \param[in,out] operation Active MAC operation.
* \param[out] mac Buffer where the MAC value is to be written.
* \param mac_size Size of the \p mac buffer in bytes.
* \param[out] mac_length On success, the number of bytes
* that make up the MAC value. This is always
* #PSA_MAC_LENGTH(\c key_type, \c key_bits, \c alg)
* where \c key_type and \c key_bits are the type and
* bit-size respectively of the key and \c alg is the
* MAC algorithm that is calculated.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be an active mac sign
* operation).
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p mac buffer is too small. You can determine a
* sufficient buffer size by calling PSA_MAC_LENGTH().
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_mac_sign_finish(psa_mac_operation_t *operation,
uint8_t *mac,
size_t mac_size,
size_t *mac_length);
/** Finish the calculation of the MAC of a message and compare it with
* an expected value.
*
* The application must call psa_mac_verify_setup() before calling this function.
* This function calculates the MAC of the message formed by concatenating
* the inputs passed to preceding calls to psa_mac_update(). It then
* compares the calculated MAC with the expected MAC passed as a
* parameter to this function.
*
* When this function returns successfuly, the operation becomes inactive.
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_mac_abort().
*
* \note Implementations shall make the best effort to ensure that the
* comparison between the actual MAC and the expected MAC is performed
* in constant time.
*
* \param[in,out] operation Active MAC operation.
* \param[in] mac Buffer containing the expected MAC value.
* \param mac_length Size of the \p mac buffer in bytes.
*
* \retval #PSA_SUCCESS
* The expected MAC is identical to the actual MAC of the message.
* \retval #PSA_ERROR_INVALID_SIGNATURE
* The MAC of the message was calculated successfully, but it
* differs from the expected MAC.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be an active mac verify
* operation).
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_mac_verify_finish(psa_mac_operation_t *operation,
const uint8_t *mac,
size_t mac_length);
/** Abort a MAC operation.
*
* Aborting an operation frees all associated resources except for the
* \p operation structure itself. Once aborted, the operation object
* can be reused for another operation by calling
* psa_mac_sign_setup() or psa_mac_verify_setup() again.
*
* You may call this function any time after the operation object has
* been initialized by one of the methods described in #psa_mac_operation_t.
*
* In particular, calling psa_mac_abort() after the operation has been
* terminated by a call to psa_mac_abort(), psa_mac_sign_finish() or
* psa_mac_verify_finish() is safe and has no effect.
*
* \param[in,out] operation Initialized MAC operation.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_mac_abort(psa_mac_operation_t *operation);
/**@}*/
/** \defgroup cipher Symmetric ciphers
* @{
*/
/** Encrypt a message using a symmetric cipher.
*
* This function encrypts a message with a random IV (initialization
* vector). Use the multipart operation interface with a
* #psa_cipher_operation_t object to provide other forms of IV.
*
* \param key Identifier of the key to use for the operation.
* It must allow the usage #PSA_KEY_USAGE_ENCRYPT.
* \param alg The cipher algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_CIPHER(\p alg) is true).
* \param[in] input Buffer containing the message to encrypt.
* \param input_length Size of the \p input buffer in bytes.
* \param[out] output Buffer where the output is to be written.
* The output contains the IV followed by
* the ciphertext proper.
* \param output_size Size of the \p output buffer in bytes.
* \param[out] output_length On success, the number of bytes
* that make up the output.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p key is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not a cipher algorithm.
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_cipher_encrypt(psa_key_id_t key,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
uint8_t *output,
size_t output_size,
size_t *output_length);
/** Decrypt a message using a symmetric cipher.
*
* This function decrypts a message encrypted with a symmetric cipher.
*
* \param key Identifier of the key to use for the operation.
* It must remain valid until the operation
* terminates. It must allow the usage
* #PSA_KEY_USAGE_DECRYPT.
* \param alg The cipher algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_CIPHER(\p alg) is true).
* \param[in] input Buffer containing the message to decrypt.
* This consists of the IV followed by the
* ciphertext proper.
* \param input_length Size of the \p input buffer in bytes.
* \param[out] output Buffer where the plaintext is to be written.
* \param output_size Size of the \p output buffer in bytes.
* \param[out] output_length On success, the number of bytes
* that make up the output.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p key is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not a cipher algorithm.
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_cipher_decrypt(psa_key_id_t key,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
uint8_t *output,
size_t output_size,
size_t *output_length);
/** The type of the state data structure for multipart cipher operations.
*
* Before calling any function on a cipher operation object, the application
* must initialize it by any of the following means:
* - Set the structure to all-bits-zero, for example:
* \code
* psa_cipher_operation_t operation;
* memset(&operation, 0, sizeof(operation));
* \endcode
* - Initialize the structure to logical zero values, for example:
* \code
* psa_cipher_operation_t operation = {0};
* \endcode
* - Initialize the structure to the initializer #PSA_CIPHER_OPERATION_INIT,
* for example:
* \code
* psa_cipher_operation_t operation = PSA_CIPHER_OPERATION_INIT;
* \endcode
* - Assign the result of the function psa_cipher_operation_init()
* to the structure, for example:
* \code
* psa_cipher_operation_t operation;
* operation = psa_cipher_operation_init();
* \endcode
*
* This is an implementation-defined \c struct. Applications should not
* make any assumptions about the content of this structure.
* Implementation details can change in future versions without notice. */
typedef struct psa_cipher_operation_s psa_cipher_operation_t;
/** Return an initial value for a cipher operation object.
*/
static psa_cipher_operation_t psa_cipher_operation_init(void);
/** Set the key for a multipart symmetric encryption operation.
*
* The sequence of operations to encrypt a message with a symmetric cipher
* is as follows:
* -# Allocate an operation object which will be passed to all the functions
* listed here.
* -# Initialize the operation object with one of the methods described in the
* documentation for #psa_cipher_operation_t, e.g.
* #PSA_CIPHER_OPERATION_INIT.
* -# Call psa_cipher_encrypt_setup() to specify the algorithm and key.
* -# Call either psa_cipher_generate_iv() or psa_cipher_set_iv() to
* generate or set the IV (initialization vector). You should use
* psa_cipher_generate_iv() unless the protocol you are implementing
* requires a specific IV value.
* -# Call psa_cipher_update() zero, one or more times, passing a fragment
* of the message each time.
* -# Call psa_cipher_finish().
*
* If an error occurs at any step after a call to psa_cipher_encrypt_setup(),
* the operation will need to be reset by a call to psa_cipher_abort(). The
* application may call psa_cipher_abort() at any time after the operation
* has been initialized.
*
* After a successful call to psa_cipher_encrypt_setup(), the application must
* eventually terminate the operation. The following events terminate an
* operation:
* - A successful call to psa_cipher_finish().
* - A call to psa_cipher_abort().
*
* \param[in,out] operation The operation object to set up. It must have
* been initialized as per the documentation for
* #psa_cipher_operation_t and not yet in use.
* \param key Identifier of the key to use for the operation.
* It must remain valid until the operation
* terminates. It must allow the usage
* #PSA_KEY_USAGE_ENCRYPT.
* \param alg The cipher algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_CIPHER(\p alg) is true).
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p key is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not a cipher algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be inactive).
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_cipher_encrypt_setup(psa_cipher_operation_t *operation,
psa_key_id_t key,
psa_algorithm_t alg);
/** Set the key for a multipart symmetric decryption operation.
*
* The sequence of operations to decrypt a message with a symmetric cipher
* is as follows:
* -# Allocate an operation object which will be passed to all the functions
* listed here.
* -# Initialize the operation object with one of the methods described in the
* documentation for #psa_cipher_operation_t, e.g.
* #PSA_CIPHER_OPERATION_INIT.
* -# Call psa_cipher_decrypt_setup() to specify the algorithm and key.
* -# Call psa_cipher_set_iv() with the IV (initialization vector) for the
* decryption. If the IV is prepended to the ciphertext, you can call
* psa_cipher_update() on a buffer containing the IV followed by the
* beginning of the message.
* -# Call psa_cipher_update() zero, one or more times, passing a fragment
* of the message each time.
* -# Call psa_cipher_finish().
*
* If an error occurs at any step after a call to psa_cipher_decrypt_setup(),
* the operation will need to be reset by a call to psa_cipher_abort(). The
* application may call psa_cipher_abort() at any time after the operation
* has been initialized.
*
* After a successful call to psa_cipher_decrypt_setup(), the application must
* eventually terminate the operation. The following events terminate an
* operation:
* - A successful call to psa_cipher_finish().
* - A call to psa_cipher_abort().
*
* \param[in,out] operation The operation object to set up. It must have
* been initialized as per the documentation for
* #psa_cipher_operation_t and not yet in use.
* \param key Identifier of the key to use for the operation.
* It must remain valid until the operation
* terminates. It must allow the usage
* #PSA_KEY_USAGE_DECRYPT.
* \param alg The cipher algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_CIPHER(\p alg) is true).
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p key is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not a cipher algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be inactive).
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_cipher_decrypt_setup(psa_cipher_operation_t *operation,
psa_key_id_t key,
psa_algorithm_t alg);
/** Generate an IV for a symmetric encryption operation.
*
* This function generates a random IV (initialization vector), nonce
* or initial counter value for the encryption operation as appropriate
* for the chosen algorithm, key type and key size.
*
* The application must call psa_cipher_encrypt_setup() before
* calling this function.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_cipher_abort().
*
* \param[in,out] operation Active cipher operation.
* \param[out] iv Buffer where the generated IV is to be written.
* \param iv_size Size of the \p iv buffer in bytes.
* \param[out] iv_length On success, the number of bytes of the
* generated IV.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active, with no IV set).
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p iv buffer is too small.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_cipher_generate_iv(psa_cipher_operation_t *operation,
uint8_t *iv,
size_t iv_size,
size_t *iv_length);
/** Set the IV for a symmetric encryption or decryption operation.
*
* This function sets the IV (initialization vector), nonce
* or initial counter value for the encryption or decryption operation.
*
* The application must call psa_cipher_encrypt_setup() before
* calling this function.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_cipher_abort().
*
* \note When encrypting, applications should use psa_cipher_generate_iv()
* instead of this function, unless implementing a protocol that requires
* a non-random IV.
*
* \param[in,out] operation Active cipher operation.
* \param[in] iv Buffer containing the IV to use.
* \param iv_length Size of the IV in bytes.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be an active cipher
* encrypt operation, with no IV set).
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The size of \p iv is not acceptable for the chosen algorithm,
* or the chosen algorithm does not use an IV.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_cipher_set_iv(psa_cipher_operation_t *operation,
const uint8_t *iv,
size_t iv_length);
/** Encrypt or decrypt a message fragment in an active cipher operation.
*
* Before calling this function, you must:
* 1. Call either psa_cipher_encrypt_setup() or psa_cipher_decrypt_setup().
* The choice of setup function determines whether this function
* encrypts or decrypts its input.
* 2. If the algorithm requires an IV, call psa_cipher_generate_iv()
* (recommended when encrypting) or psa_cipher_set_iv().
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_cipher_abort().
*
* \param[in,out] operation Active cipher operation.
* \param[in] input Buffer containing the message fragment to
* encrypt or decrypt.
* \param input_length Size of the \p input buffer in bytes.
* \param[out] output Buffer where the output is to be written.
* \param output_size Size of the \p output buffer in bytes.
* \param[out] output_length On success, the number of bytes
* that make up the returned output.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active, with an IV set
* if required for the algorithm).
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p output buffer is too small.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_cipher_update(psa_cipher_operation_t *operation,
const uint8_t *input,
size_t input_length,
uint8_t *output,
size_t output_size,
size_t *output_length);
/** Finish encrypting or decrypting a message in a cipher operation.
*
* The application must call psa_cipher_encrypt_setup() or
* psa_cipher_decrypt_setup() before calling this function. The choice
* of setup function determines whether this function encrypts or
* decrypts its input.
*
* This function finishes the encryption or decryption of the message
* formed by concatenating the inputs passed to preceding calls to
* psa_cipher_update().
*
* When this function returns successfuly, the operation becomes inactive.
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_cipher_abort().
*
* \param[in,out] operation Active cipher operation.
* \param[out] output Buffer where the output is to be written.
* \param output_size Size of the \p output buffer in bytes.
* \param[out] output_length On success, the number of bytes
* that make up the returned output.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The total input size passed to this operation is not valid for
* this particular algorithm. For example, the algorithm is a based
* on block cipher and requires a whole number of blocks, but the
* total input size is not a multiple of the block size.
* \retval #PSA_ERROR_INVALID_PADDING
* This is a decryption operation for an algorithm that includes
* padding, and the ciphertext does not contain valid padding.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active, with an IV set
* if required for the algorithm).
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p output buffer is too small.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_cipher_finish(psa_cipher_operation_t *operation,
uint8_t *output,
size_t output_size,
size_t *output_length);
/** Abort a cipher operation.
*
* Aborting an operation frees all associated resources except for the
* \p operation structure itself. Once aborted, the operation object
* can be reused for another operation by calling
* psa_cipher_encrypt_setup() or psa_cipher_decrypt_setup() again.
*
* You may call this function any time after the operation object has
* been initialized as described in #psa_cipher_operation_t.
*
* In particular, calling psa_cipher_abort() after the operation has been
* terminated by a call to psa_cipher_abort() or psa_cipher_finish()
* is safe and has no effect.
*
* \param[in,out] operation Initialized cipher operation.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_cipher_abort(psa_cipher_operation_t *operation);
/**@}*/
/** \defgroup aead Authenticated encryption with associated data (AEAD)
* @{
*/
/** Process an authenticated encryption operation.
*
* \param key Identifier of the key to use for the
* operation. It must allow the usage
* #PSA_KEY_USAGE_ENCRYPT.
* \param alg The AEAD algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_AEAD(\p alg) is true).
* \param[in] nonce Nonce or IV to use.
* \param nonce_length Size of the \p nonce buffer in bytes.
* \param[in] additional_data Additional data that will be authenticated
* but not encrypted.
* \param additional_data_length Size of \p additional_data in bytes.
* \param[in] plaintext Data that will be authenticated and
* encrypted.
* \param plaintext_length Size of \p plaintext in bytes.
* \param[out] ciphertext Output buffer for the authenticated and
* encrypted data. The additional data is not
* part of this output. For algorithms where the
* encrypted data and the authentication tag
* are defined as separate outputs, the
* authentication tag is appended to the
* encrypted data.
* \param ciphertext_size Size of the \p ciphertext buffer in bytes.
* This must be appropriate for the selected
* algorithm and key:
* - A sufficient output size is
* #PSA_AEAD_ENCRYPT_OUTPUT_SIZE(\c key_type,
* \p alg, \p plaintext_length) where
* \c key_type is the type of \p key.
* - #PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE(\p
* plaintext_length) evaluates to the maximum
* ciphertext size of any supported AEAD
* encryption.
* \param[out] ciphertext_length On success, the size of the output
* in the \p ciphertext buffer.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p key is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not an AEAD algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* \p ciphertext_size is too small.
* #PSA_AEAD_ENCRYPT_OUTPUT_SIZE(\c key_type, \p alg,
* \p plaintext_length) or
* #PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE(\p plaintext_length) can be used to
* determine the required buffer size.
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_encrypt(psa_key_id_t key,
psa_algorithm_t alg,
const uint8_t *nonce,
size_t nonce_length,
const uint8_t *additional_data,
size_t additional_data_length,
const uint8_t *plaintext,
size_t plaintext_length,
uint8_t *ciphertext,
size_t ciphertext_size,
size_t *ciphertext_length);
/** Process an authenticated decryption operation.
*
* \param key Identifier of the key to use for the
* operation. It must allow the usage
* #PSA_KEY_USAGE_DECRYPT.
* \param alg The AEAD algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_AEAD(\p alg) is true).
* \param[in] nonce Nonce or IV to use.
* \param nonce_length Size of the \p nonce buffer in bytes.
* \param[in] additional_data Additional data that has been authenticated
* but not encrypted.
* \param additional_data_length Size of \p additional_data in bytes.
* \param[in] ciphertext Data that has been authenticated and
* encrypted. For algorithms where the
* encrypted data and the authentication tag
* are defined as separate inputs, the buffer
* must contain the encrypted data followed
* by the authentication tag.
* \param ciphertext_length Size of \p ciphertext in bytes.
* \param[out] plaintext Output buffer for the decrypted data.
* \param plaintext_size Size of the \p plaintext buffer in bytes.
* This must be appropriate for the selected
* algorithm and key:
* - A sufficient output size is
* #PSA_AEAD_DECRYPT_OUTPUT_SIZE(\c key_type,
* \p alg, \p ciphertext_length) where
* \c key_type is the type of \p key.
* - #PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE(\p
* ciphertext_length) evaluates to the maximum
* plaintext size of any supported AEAD
* decryption.
* \param[out] plaintext_length On success, the size of the output
* in the \p plaintext buffer.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_INVALID_SIGNATURE
* The ciphertext is not authentic.
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p key is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not an AEAD algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* \p plaintext_size is too small.
* #PSA_AEAD_DECRYPT_OUTPUT_SIZE(\c key_type, \p alg,
* \p ciphertext_length) or
* #PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE(\p ciphertext_length) can be used
* to determine the required buffer size.
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_decrypt(psa_key_id_t key,
psa_algorithm_t alg,
const uint8_t *nonce,
size_t nonce_length,
const uint8_t *additional_data,
size_t additional_data_length,
const uint8_t *ciphertext,
size_t ciphertext_length,
uint8_t *plaintext,
size_t plaintext_size,
size_t *plaintext_length);
/** The type of the state data structure for multipart AEAD operations.
*
* Before calling any function on an AEAD operation object, the application
* must initialize it by any of the following means:
* - Set the structure to all-bits-zero, for example:
* \code
* psa_aead_operation_t operation;
* memset(&operation, 0, sizeof(operation));
* \endcode
* - Initialize the structure to logical zero values, for example:
* \code
* psa_aead_operation_t operation = {0};
* \endcode
* - Initialize the structure to the initializer #PSA_AEAD_OPERATION_INIT,
* for example:
* \code
* psa_aead_operation_t operation = PSA_AEAD_OPERATION_INIT;
* \endcode
* - Assign the result of the function psa_aead_operation_init()
* to the structure, for example:
* \code
* psa_aead_operation_t operation;
* operation = psa_aead_operation_init();
* \endcode
*
* This is an implementation-defined \c struct. Applications should not
* make any assumptions about the content of this structure.
* Implementation details can change in future versions without notice. */
typedef struct psa_aead_operation_s psa_aead_operation_t;
/** Return an initial value for an AEAD operation object.
*/
static psa_aead_operation_t psa_aead_operation_init(void);
/** Set the key for a multipart authenticated encryption operation.
*
* The sequence of operations to encrypt a message with authentication
* is as follows:
* -# Allocate an operation object which will be passed to all the functions
* listed here.
* -# Initialize the operation object with one of the methods described in the
* documentation for #psa_aead_operation_t, e.g.
* #PSA_AEAD_OPERATION_INIT.
* -# Call psa_aead_encrypt_setup() to specify the algorithm and key.
* -# If needed, call psa_aead_set_lengths() to specify the length of the
* inputs to the subsequent calls to psa_aead_update_ad() and
* psa_aead_update(). See the documentation of psa_aead_set_lengths()
* for details.
* -# Call either psa_aead_generate_nonce() or psa_aead_set_nonce() to
* generate or set the nonce. You should use
* psa_aead_generate_nonce() unless the protocol you are implementing
* requires a specific nonce value.
* -# Call psa_aead_update_ad() zero, one or more times, passing a fragment
* of the non-encrypted additional authenticated data each time.
* -# Call psa_aead_update() zero, one or more times, passing a fragment
* of the message to encrypt each time.
* -# Call psa_aead_finish().
*
* If an error occurs at any step after a call to psa_aead_encrypt_setup(),
* the operation will need to be reset by a call to psa_aead_abort(). The
* application may call psa_aead_abort() at any time after the operation
* has been initialized.
*
* After a successful call to psa_aead_encrypt_setup(), the application must
* eventually terminate the operation. The following events terminate an
* operation:
* - A successful call to psa_aead_finish().
* - A call to psa_aead_abort().
*
* \param[in,out] operation The operation object to set up. It must have
* been initialized as per the documentation for
* #psa_aead_operation_t and not yet in use.
* \param key Identifier of the key to use for the operation.
* It must remain valid until the operation
* terminates. It must allow the usage
* #PSA_KEY_USAGE_ENCRYPT.
* \param alg The AEAD algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_AEAD(\p alg) is true).
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be inactive).
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p key is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not an AEAD algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_encrypt_setup(psa_aead_operation_t *operation,
psa_key_id_t key,
psa_algorithm_t alg);
/** Set the key for a multipart authenticated decryption operation.
*
* The sequence of operations to decrypt a message with authentication
* is as follows:
* -# Allocate an operation object which will be passed to all the functions
* listed here.
* -# Initialize the operation object with one of the methods described in the
* documentation for #psa_aead_operation_t, e.g.
* #PSA_AEAD_OPERATION_INIT.
* -# Call psa_aead_decrypt_setup() to specify the algorithm and key.
* -# If needed, call psa_aead_set_lengths() to specify the length of the
* inputs to the subsequent calls to psa_aead_update_ad() and
* psa_aead_update(). See the documentation of psa_aead_set_lengths()
* for details.
* -# Call psa_aead_set_nonce() with the nonce for the decryption.
* -# Call psa_aead_update_ad() zero, one or more times, passing a fragment
* of the non-encrypted additional authenticated data each time.
* -# Call psa_aead_update() zero, one or more times, passing a fragment
* of the ciphertext to decrypt each time.
* -# Call psa_aead_verify().
*
* If an error occurs at any step after a call to psa_aead_decrypt_setup(),
* the operation will need to be reset by a call to psa_aead_abort(). The
* application may call psa_aead_abort() at any time after the operation
* has been initialized.
*
* After a successful call to psa_aead_decrypt_setup(), the application must
* eventually terminate the operation. The following events terminate an
* operation:
* - A successful call to psa_aead_verify().
* - A call to psa_aead_abort().
*
* \param[in,out] operation The operation object to set up. It must have
* been initialized as per the documentation for
* #psa_aead_operation_t and not yet in use.
* \param key Identifier of the key to use for the operation.
* It must remain valid until the operation
* terminates. It must allow the usage
* #PSA_KEY_USAGE_DECRYPT.
* \param alg The AEAD algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_AEAD(\p alg) is true).
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be inactive).
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p key is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not an AEAD algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_decrypt_setup(psa_aead_operation_t *operation,
psa_key_id_t key,
psa_algorithm_t alg);
/** Generate a random nonce for an authenticated encryption operation.
*
* This function generates a random nonce for the authenticated encryption
* operation with an appropriate size for the chosen algorithm, key type
* and key size.
*
* The application must call psa_aead_encrypt_setup() before
* calling this function.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_aead_abort().
*
* \param[in,out] operation Active AEAD operation.
* \param[out] nonce Buffer where the generated nonce is to be
* written.
* \param nonce_size Size of the \p nonce buffer in bytes.
* \param[out] nonce_length On success, the number of bytes of the
* generated nonce.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be an active aead encrypt
* operation, with no nonce set).
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p nonce buffer is too small.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_generate_nonce(psa_aead_operation_t *operation,
uint8_t *nonce,
size_t nonce_size,
size_t *nonce_length);
/** Set the nonce for an authenticated encryption or decryption operation.
*
* This function sets the nonce for the authenticated
* encryption or decryption operation.
*
* The application must call psa_aead_encrypt_setup() or
* psa_aead_decrypt_setup() before calling this function.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_aead_abort().
*
* \note When encrypting, applications should use psa_aead_generate_nonce()
* instead of this function, unless implementing a protocol that requires
* a non-random IV.
*
* \param[in,out] operation Active AEAD operation.
* \param[in] nonce Buffer containing the nonce to use.
* \param nonce_length Size of the nonce in bytes.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active, with no nonce
* set).
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The size of \p nonce is not acceptable for the chosen algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_set_nonce(psa_aead_operation_t *operation,
const uint8_t *nonce,
size_t nonce_length);
/** Declare the lengths of the message and additional data for AEAD.
*
* The application must call this function before calling
* psa_aead_update_ad() or psa_aead_update() if the algorithm for
* the operation requires it. If the algorithm does not require it,
* calling this function is optional, but if this function is called
* then the implementation must enforce the lengths.
*
* You may call this function before or after setting the nonce with
* psa_aead_set_nonce() or psa_aead_generate_nonce().
*
* - For #PSA_ALG_CCM, calling this function is required.
* - For the other AEAD algorithms defined in this specification, calling
* this function is not required.
* - For vendor-defined algorithm, refer to the vendor documentation.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_aead_abort().
*
* \param[in,out] operation Active AEAD operation.
* \param ad_length Size of the non-encrypted additional
* authenticated data in bytes.
* \param plaintext_length Size of the plaintext to encrypt in bytes.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active, and
* psa_aead_update_ad() and psa_aead_update() must not have been
* called yet).
* \retval #PSA_ERROR_INVALID_ARGUMENT
* At least one of the lengths is not acceptable for the chosen
* algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_set_lengths(psa_aead_operation_t *operation,
size_t ad_length,
size_t plaintext_length);
/** Pass additional data to an active AEAD operation.
*
* Additional data is authenticated, but not encrypted.
*
* You may call this function multiple times to pass successive fragments
* of the additional data. You may not call this function after passing
* data to encrypt or decrypt with psa_aead_update().
*
* Before calling this function, you must:
* 1. Call either psa_aead_encrypt_setup() or psa_aead_decrypt_setup().
* 2. Set the nonce with psa_aead_generate_nonce() or psa_aead_set_nonce().
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_aead_abort().
*
* \warning When decrypting, until psa_aead_verify() has returned #PSA_SUCCESS,
* there is no guarantee that the input is valid. Therefore, until
* you have called psa_aead_verify() and it has returned #PSA_SUCCESS,
* treat the input as untrusted and prepare to undo any action that
* depends on the input if psa_aead_verify() returns an error status.
*
* \param[in,out] operation Active AEAD operation.
* \param[in] input Buffer containing the fragment of
* additional data.
* \param input_length Size of the \p input buffer in bytes.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active, have a nonce
* set, have lengths set if required by the algorithm, and
* psa_aead_update() must not have been called yet).
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The total input length overflows the additional data length that
* was previously specified with psa_aead_set_lengths().
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_update_ad(psa_aead_operation_t *operation,
const uint8_t *input,
size_t input_length);
/** Encrypt or decrypt a message fragment in an active AEAD operation.
*
* Before calling this function, you must:
* 1. Call either psa_aead_encrypt_setup() or psa_aead_decrypt_setup().
* The choice of setup function determines whether this function
* encrypts or decrypts its input.
* 2. Set the nonce with psa_aead_generate_nonce() or psa_aead_set_nonce().
* 3. Call psa_aead_update_ad() to pass all the additional data.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_aead_abort().
*
* \warning When decrypting, until psa_aead_verify() has returned #PSA_SUCCESS,
* there is no guarantee that the input is valid. Therefore, until
* you have called psa_aead_verify() and it has returned #PSA_SUCCESS:
* - Do not use the output in any way other than storing it in a
* confidential location. If you take any action that depends
* on the tentative decrypted data, this action will need to be
* undone if the input turns out not to be valid. Furthermore,
* if an adversary can observe that this action took place
* (for example through timing), they may be able to use this
* fact as an oracle to decrypt any message encrypted with the
* same key.
* - In particular, do not copy the output anywhere but to a
* memory or storage space that you have exclusive access to.
*
* This function does not require the input to be aligned to any
* particular block boundary. If the implementation can only process
* a whole block at a time, it must consume all the input provided, but
* it may delay the end of the corresponding output until a subsequent
* call to psa_aead_update(), psa_aead_finish() or psa_aead_verify()
* provides sufficient input. The amount of data that can be delayed
* in this way is bounded by #PSA_AEAD_UPDATE_OUTPUT_SIZE.
*
* \param[in,out] operation Active AEAD operation.
* \param[in] input Buffer containing the message fragment to
* encrypt or decrypt.
* \param input_length Size of the \p input buffer in bytes.
* \param[out] output Buffer where the output is to be written.
* \param output_size Size of the \p output buffer in bytes.
* This must be appropriate for the selected
* algorithm and key:
* - A sufficient output size is
* #PSA_AEAD_UPDATE_OUTPUT_SIZE(\c key_type,
* \c alg, \p input_length) where
* \c key_type is the type of key and \c alg is
* the algorithm that were used to set up the
* operation.
* - #PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE(\p
* input_length) evaluates to the maximum
* output size of any supported AEAD
* algorithm.
* \param[out] output_length On success, the number of bytes
* that make up the returned output.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active, have a nonce
* set, and have lengths set if required by the algorithm).
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p output buffer is too small.
* #PSA_AEAD_UPDATE_OUTPUT_SIZE(\c key_type, \c alg, \p input_length) or
* #PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE(\p input_length) can be used to
* determine the required buffer size.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The total length of input to psa_aead_update_ad() so far is
* less than the additional data length that was previously
* specified with psa_aead_set_lengths().
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The total input length overflows the plaintext length that
* was previously specified with psa_aead_set_lengths().
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_update(psa_aead_operation_t *operation,
const uint8_t *input,
size_t input_length,
uint8_t *output,
size_t output_size,
size_t *output_length);
/** Finish encrypting a message in an AEAD operation.
*
* The operation must have been set up with psa_aead_encrypt_setup().
*
* This function finishes the authentication of the additional data
* formed by concatenating the inputs passed to preceding calls to
* psa_aead_update_ad() with the plaintext formed by concatenating the
* inputs passed to preceding calls to psa_aead_update().
*
* This function has two output buffers:
* - \p ciphertext contains trailing ciphertext that was buffered from
* preceding calls to psa_aead_update().
* - \p tag contains the authentication tag.
*
* When this function returns successfuly, the operation becomes inactive.
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_aead_abort().
*
* \param[in,out] operation Active AEAD operation.
* \param[out] ciphertext Buffer where the last part of the ciphertext
* is to be written.
* \param ciphertext_size Size of the \p ciphertext buffer in bytes.
* This must be appropriate for the selected
* algorithm and key:
* - A sufficient output size is
* #PSA_AEAD_FINISH_OUTPUT_SIZE(\c key_type,
* \c alg) where \c key_type is the type of key
* and \c alg is the algorithm that were used to
* set up the operation.
* - #PSA_AEAD_FINISH_OUTPUT_MAX_SIZE evaluates to
* the maximum output size of any supported AEAD
* algorithm.
* \param[out] ciphertext_length On success, the number of bytes of
* returned ciphertext.
* \param[out] tag Buffer where the authentication tag is
* to be written.
* \param tag_size Size of the \p tag buffer in bytes.
* This must be appropriate for the selected
* algorithm and key:
* - The exact tag size is #PSA_AEAD_TAG_LENGTH(\c
* key_type, \c key_bits, \c alg) where
* \c key_type and \c key_bits are the type and
* bit-size of the key, and \c alg is the
* algorithm that were used in the call to
* psa_aead_encrypt_setup().
* - #PSA_AEAD_TAG_MAX_SIZE evaluates to the
* maximum tag size of any supported AEAD
* algorithm.
* \param[out] tag_length On success, the number of bytes
* that make up the returned tag.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be an active encryption
* operation with a nonce set).
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p ciphertext or \p tag buffer is too small.
* #PSA_AEAD_FINISH_OUTPUT_SIZE(\c key_type, \c alg) or
* #PSA_AEAD_FINISH_OUTPUT_MAX_SIZE can be used to determine the
* required \p ciphertext buffer size. #PSA_AEAD_TAG_LENGTH(\c key_type,
* \c key_bits, \c alg) or #PSA_AEAD_TAG_MAX_SIZE can be used to
* determine the required \p tag buffer size.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The total length of input to psa_aead_update_ad() so far is
* less than the additional data length that was previously
* specified with psa_aead_set_lengths().
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The total length of input to psa_aead_update() so far is
* less than the plaintext length that was previously
* specified with psa_aead_set_lengths().
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_finish(psa_aead_operation_t *operation,
uint8_t *ciphertext,
size_t ciphertext_size,
size_t *ciphertext_length,
uint8_t *tag,
size_t tag_size,
size_t *tag_length);
/** Finish authenticating and decrypting a message in an AEAD operation.
*
* The operation must have been set up with psa_aead_decrypt_setup().
*
* This function finishes the authenticated decryption of the message
* components:
*
* - The additional data consisting of the concatenation of the inputs
* passed to preceding calls to psa_aead_update_ad().
* - The ciphertext consisting of the concatenation of the inputs passed to
* preceding calls to psa_aead_update().
* - The tag passed to this function call.
*
* If the authentication tag is correct, this function outputs any remaining
* plaintext and reports success. If the authentication tag is not correct,
* this function returns #PSA_ERROR_INVALID_SIGNATURE.
*
* When this function returns successfuly, the operation becomes inactive.
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_aead_abort().
*
* \note Implementations shall make the best effort to ensure that the
* comparison between the actual tag and the expected tag is performed
* in constant time.
*
* \param[in,out] operation Active AEAD operation.
* \param[out] plaintext Buffer where the last part of the plaintext
* is to be written. This is the remaining data
* from previous calls to psa_aead_update()
* that could not be processed until the end
* of the input.
* \param plaintext_size Size of the \p plaintext buffer in bytes.
* This must be appropriate for the selected algorithm and key:
* - A sufficient output size is
* #PSA_AEAD_VERIFY_OUTPUT_SIZE(\c key_type,
* \c alg) where \c key_type is the type of key
* and \c alg is the algorithm that were used to
* set up the operation.
* - #PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE evaluates to
* the maximum output size of any supported AEAD
* algorithm.
* \param[out] plaintext_length On success, the number of bytes of
* returned plaintext.
* \param[in] tag Buffer containing the authentication tag.
* \param tag_length Size of the \p tag buffer in bytes.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_SIGNATURE
* The calculations were successful, but the authentication tag is
* not correct.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be an active decryption
* operation with a nonce set).
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p plaintext buffer is too small.
* #PSA_AEAD_VERIFY_OUTPUT_SIZE(\c key_type, \c alg) or
* #PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE can be used to determine the
* required buffer size.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The total length of input to psa_aead_update_ad() so far is
* less than the additional data length that was previously
* specified with psa_aead_set_lengths().
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The total length of input to psa_aead_update() so far is
* less than the plaintext length that was previously
* specified with psa_aead_set_lengths().
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_verify(psa_aead_operation_t *operation,
uint8_t *plaintext,
size_t plaintext_size,
size_t *plaintext_length,
const uint8_t *tag,
size_t tag_length);
/** Abort an AEAD operation.
*
* Aborting an operation frees all associated resources except for the
* \p operation structure itself. Once aborted, the operation object
* can be reused for another operation by calling
* psa_aead_encrypt_setup() or psa_aead_decrypt_setup() again.
*
* You may call this function any time after the operation object has
* been initialized as described in #psa_aead_operation_t.
*
* In particular, calling psa_aead_abort() after the operation has been
* terminated by a call to psa_aead_abort(), psa_aead_finish() or
* psa_aead_verify() is safe and has no effect.
*
* \param[in,out] operation Initialized AEAD operation.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_abort(psa_aead_operation_t *operation);
/**@}*/
/** \defgroup asymmetric Asymmetric cryptography
* @{
*/
/**
* \brief Sign a message with a private key. For hash-and-sign algorithms,
* this includes the hashing step.
*
* \note To perform a multi-part hash-and-sign signature algorithm, first use
* a multi-part hash operation and then pass the resulting hash to
* psa_sign_hash(). PSA_ALG_GET_HASH(\p alg) can be used to determine the
* hash algorithm to use.
*
* \param[in] key Identifier of the key to use for the operation.
* It must be an asymmetric key pair. The key must
* allow the usage #PSA_KEY_USAGE_SIGN_MESSAGE.
* \param[in] alg An asymmetric signature algorithm (PSA_ALG_XXX
* value such that #PSA_ALG_IS_SIGN_MESSAGE(\p alg)
* is true), that is compatible with the type of
* \p key.
* \param[in] input The input message to sign.
* \param[in] input_length Size of the \p input buffer in bytes.
* \param[out] signature Buffer where the signature is to be written.
* \param[in] signature_size Size of the \p signature buffer in bytes. This
* must be appropriate for the selected
* algorithm and key:
* - The required signature size is
* #PSA_SIGN_OUTPUT_SIZE(\c key_type, \c key_bits, \p alg)
* where \c key_type and \c key_bits are the type and
* bit-size respectively of key.
* - #PSA_SIGNATURE_MAX_SIZE evaluates to the
* maximum signature size of any supported
* signature algorithm.
* \param[out] signature_length On success, the number of bytes that make up
* the returned signature value.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* The key does not have the #PSA_KEY_USAGE_SIGN_MESSAGE flag,
* or it does not permit the requested algorithm.
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p signature buffer is too small. You can
* determine a sufficient buffer size by calling
* #PSA_SIGN_OUTPUT_SIZE(\c key_type, \c key_bits, \p alg)
* where \c key_type and \c key_bits are the type and bit-size
* respectively of \p key.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_DATA_CORRUPT
* \retval #PSA_ERROR_DATA_INVALID
* \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_sign_message( psa_key_id_t key,
psa_algorithm_t alg,
const uint8_t * input,
size_t input_length,
uint8_t * signature,
size_t signature_size,
size_t * signature_length );
/** \brief Verify the signature of a message with a public key, using
* a hash-and-sign verification algorithm.
*
* \note To perform a multi-part hash-and-sign signature verification
* algorithm, first use a multi-part hash operation to hash the message
* and then pass the resulting hash to psa_verify_hash().
* PSA_ALG_GET_HASH(\p alg) can be used to determine the hash algorithm
* to use.
*
* \param[in] key Identifier of the key to use for the operation.
* It must be a public key or an asymmetric key
* pair. The key must allow the usage
* #PSA_KEY_USAGE_VERIFY_MESSAGE.
* \param[in] alg An asymmetric signature algorithm (PSA_ALG_XXX
* value such that #PSA_ALG_IS_SIGN_MESSAGE(\p alg)
* is true), that is compatible with the type of
* \p key.
* \param[in] input The message whose signature is to be verified.
* \param[in] input_length Size of the \p input buffer in bytes.
* \param[out] signature Buffer containing the signature to verify.
* \param[in] signature_length Size of the \p signature buffer in bytes.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* The key does not have the #PSA_KEY_USAGE_SIGN_MESSAGE flag,
* or it does not permit the requested algorithm.
* \retval #PSA_ERROR_INVALID_SIGNATURE
* The calculation was performed successfully, but the passed signature
* is not a valid signature.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_DATA_CORRUPT
* \retval #PSA_ERROR_DATA_INVALID
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_verify_message( psa_key_id_t key,
psa_algorithm_t alg,
const uint8_t * input,
size_t input_length,
const uint8_t * signature,
size_t signature_length );
/**
* \brief Sign a hash or short message with a private key.
*
* Note that to perform a hash-and-sign signature algorithm, you must
* first calculate the hash by calling psa_hash_setup(), psa_hash_update()
* and psa_hash_finish(), or alternatively by calling psa_hash_compute().
* Then pass the resulting hash as the \p hash
* parameter to this function. You can use #PSA_ALG_SIGN_GET_HASH(\p alg)
* to determine the hash algorithm to use.
*
* \param key Identifier of the key to use for the operation.
* It must be an asymmetric key pair. The key must
* allow the usage #PSA_KEY_USAGE_SIGN_HASH.
* \param alg A signature algorithm that is compatible with
* the type of \p key.
* \param[in] hash The hash or message to sign.
* \param hash_length Size of the \p hash buffer in bytes.
* \param[out] signature Buffer where the signature is to be written.
* \param signature_size Size of the \p signature buffer in bytes.
* \param[out] signature_length On success, the number of bytes
* that make up the returned signature value.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p signature buffer is too small. You can
* determine a sufficient buffer size by calling
* #PSA_SIGN_OUTPUT_SIZE(\c key_type, \c key_bits, \p alg)
* where \c key_type and \c key_bits are the type and bit-size
* respectively of \p key.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_sign_hash(psa_key_id_t key,
psa_algorithm_t alg,
const uint8_t *hash,
size_t hash_length,
uint8_t *signature,
size_t signature_size,
size_t *signature_length);
/**
* \brief Verify the signature of a hash or short message using a public key.
*
* Note that to perform a hash-and-sign signature algorithm, you must
* first calculate the hash by calling psa_hash_setup(), psa_hash_update()
* and psa_hash_finish(), or alternatively by calling psa_hash_compute().
* Then pass the resulting hash as the \p hash
* parameter to this function. You can use #PSA_ALG_SIGN_GET_HASH(\p alg)
* to determine the hash algorithm to use.
*
* \param key Identifier of the key to use for the operation. It
* must be a public key or an asymmetric key pair. The
* key must allow the usage
* #PSA_KEY_USAGE_VERIFY_HASH.
* \param alg A signature algorithm that is compatible with
* the type of \p key.
* \param[in] hash The hash or message whose signature is to be
* verified.
* \param hash_length Size of the \p hash buffer in bytes.
* \param[in] signature Buffer containing the signature to verify.
* \param signature_length Size of the \p signature buffer in bytes.
*
* \retval #PSA_SUCCESS
* The signature is valid.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_SIGNATURE
* The calculation was perfomed successfully, but the passed
* signature is not a valid signature.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_verify_hash(psa_key_id_t key,
psa_algorithm_t alg,
const uint8_t *hash,
size_t hash_length,
const uint8_t *signature,
size_t signature_length);
/**
* \brief Encrypt a short message with a public key.
*
* \param key Identifer of the key to use for the operation.
* It must be a public key or an asymmetric key
* pair. It must allow the usage
* #PSA_KEY_USAGE_ENCRYPT.
* \param alg An asymmetric encryption algorithm that is
* compatible with the type of \p key.
* \param[in] input The message to encrypt.
* \param input_length Size of the \p input buffer in bytes.
* \param[in] salt A salt or label, if supported by the
* encryption algorithm.
* If the algorithm does not support a
* salt, pass \c NULL.
* If the algorithm supports an optional
* salt and you do not want to pass a salt,
* pass \c NULL.
*
* - For #PSA_ALG_RSA_PKCS1V15_CRYPT, no salt is
* supported.
* \param salt_length Size of the \p salt buffer in bytes.
* If \p salt is \c NULL, pass 0.
* \param[out] output Buffer where the encrypted message is to
* be written.
* \param output_size Size of the \p output buffer in bytes.
* \param[out] output_length On success, the number of bytes
* that make up the returned output.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p output buffer is too small. You can
* determine a sufficient buffer size by calling
* #PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE(\c key_type, \c key_bits, \p alg)
* where \c key_type and \c key_bits are the type and bit-size
* respectively of \p key.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_asymmetric_encrypt(psa_key_id_t key,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
const uint8_t *salt,
size_t salt_length,
uint8_t *output,
size_t output_size,
size_t *output_length);
/**
* \brief Decrypt a short message with a private key.
*
* \param key Identifier of the key to use for the operation.
* It must be an asymmetric key pair. It must
* allow the usage #PSA_KEY_USAGE_DECRYPT.
* \param alg An asymmetric encryption algorithm that is
* compatible with the type of \p key.
* \param[in] input The message to decrypt.
* \param input_length Size of the \p input buffer in bytes.
* \param[in] salt A salt or label, if supported by the
* encryption algorithm.
* If the algorithm does not support a
* salt, pass \c NULL.
* If the algorithm supports an optional
* salt and you do not want to pass a salt,
* pass \c NULL.
*
* - For #PSA_ALG_RSA_PKCS1V15_CRYPT, no salt is
* supported.
* \param salt_length Size of the \p salt buffer in bytes.
* If \p salt is \c NULL, pass 0.
* \param[out] output Buffer where the decrypted message is to
* be written.
* \param output_size Size of the \c output buffer in bytes.
* \param[out] output_length On success, the number of bytes
* that make up the returned output.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p output buffer is too small. You can
* determine a sufficient buffer size by calling
* #PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE(\c key_type, \c key_bits, \p alg)
* where \c key_type and \c key_bits are the type and bit-size
* respectively of \p key.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
* \retval #PSA_ERROR_INVALID_PADDING
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_asymmetric_decrypt(psa_key_id_t key,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
const uint8_t *salt,
size_t salt_length,
uint8_t *output,
size_t output_size,
size_t *output_length);
/**@}*/
/** \defgroup key_derivation Key derivation and pseudorandom generation
* @{
*/
/** The type of the state data structure for key derivation operations.
*
* Before calling any function on a key derivation operation object, the
* application must initialize it by any of the following means:
* - Set the structure to all-bits-zero, for example:
* \code
* psa_key_derivation_operation_t operation;
* memset(&operation, 0, sizeof(operation));
* \endcode
* - Initialize the structure to logical zero values, for example:
* \code
* psa_key_derivation_operation_t operation = {0};
* \endcode
* - Initialize the structure to the initializer #PSA_KEY_DERIVATION_OPERATION_INIT,
* for example:
* \code
* psa_key_derivation_operation_t operation = PSA_KEY_DERIVATION_OPERATION_INIT;
* \endcode
* - Assign the result of the function psa_key_derivation_operation_init()
* to the structure, for example:
* \code
* psa_key_derivation_operation_t operation;
* operation = psa_key_derivation_operation_init();
* \endcode
*
* This is an implementation-defined \c struct. Applications should not
* make any assumptions about the content of this structure.
* Implementation details can change in future versions without notice.
*/
typedef struct psa_key_derivation_s psa_key_derivation_operation_t;
/** Return an initial value for a key derivation operation object.
*/
static psa_key_derivation_operation_t psa_key_derivation_operation_init(void);
/** Set up a key derivation operation.
*
* A key derivation algorithm takes some inputs and uses them to generate
* a byte stream in a deterministic way.
* This byte stream can be used to produce keys and other
* cryptographic material.
*
* To derive a key:
* -# Start with an initialized object of type #psa_key_derivation_operation_t.
* -# Call psa_key_derivation_setup() to select the algorithm.
* -# Provide the inputs for the key derivation by calling
* psa_key_derivation_input_bytes() or psa_key_derivation_input_key()
* as appropriate. Which inputs are needed, in what order, and whether
* they may be keys and if so of what type depends on the algorithm.
* -# Optionally set the operation's maximum capacity with
* psa_key_derivation_set_capacity(). You may do this before, in the middle
* of or after providing inputs. For some algorithms, this step is mandatory
* because the output depends on the maximum capacity.
* -# To derive a key, call psa_key_derivation_output_key().
* To derive a byte string for a different purpose, call
* psa_key_derivation_output_bytes().
* Successive calls to these functions use successive output bytes
* calculated by the key derivation algorithm.
* -# Clean up the key derivation operation object with
* psa_key_derivation_abort().
*
* If this function returns an error, the key derivation operation object is
* not changed.
*
* If an error occurs at any step after a call to psa_key_derivation_setup(),
* the operation will need to be reset by a call to psa_key_derivation_abort().
*
* Implementations must reject an attempt to derive a key of size 0.
*
* \param[in,out] operation The key derivation operation object
* to set up. It must
* have been initialized but not set up yet.
* \param alg The key derivation algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_KEY_DERIVATION(\p alg) is true).
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \c alg is not a key derivation algorithm.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \c alg is not supported or is not a key derivation algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be inactive).
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_key_derivation_setup(
psa_key_derivation_operation_t *operation,
psa_algorithm_t alg);
/** Retrieve the current capacity of a key derivation operation.
*
* The capacity of a key derivation is the maximum number of bytes that it can
* return. When you get *N* bytes of output from a key derivation operation,
* this reduces its capacity by *N*.
*
* \param[in] operation The operation to query.
* \param[out] capacity On success, the capacity of the operation.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active).
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_key_derivation_get_capacity(
const psa_key_derivation_operation_t *operation,
size_t *capacity);
/** Set the maximum capacity of a key derivation operation.
*
* The capacity of a key derivation operation is the maximum number of bytes
* that the key derivation operation can return from this point onwards.
*
* \param[in,out] operation The key derivation operation object to modify.
* \param capacity The new capacity of the operation.
* It must be less or equal to the operation's
* current capacity.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p capacity is larger than the operation's current capacity.
* In this case, the operation object remains valid and its capacity
* remains unchanged.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active).
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_key_derivation_set_capacity(
psa_key_derivation_operation_t *operation,
size_t capacity);
/** Use the maximum possible capacity for a key derivation operation.
*
* Use this value as the capacity argument when setting up a key derivation
* to indicate that the operation should have the maximum possible capacity.
* The value of the maximum possible capacity depends on the key derivation
* algorithm.
*/
#define PSA_KEY_DERIVATION_UNLIMITED_CAPACITY ((size_t)(-1))
/** Provide an input for key derivation or key agreement.
*
* Which inputs are required and in what order depends on the algorithm.
* Refer to the documentation of each key derivation or key agreement
* algorithm for information.
*
* This function passes direct inputs, which is usually correct for
* non-secret inputs. To pass a secret input, which should be in a key
* object, call psa_key_derivation_input_key() instead of this function.
* Refer to the documentation of individual step types
* (`PSA_KEY_DERIVATION_INPUT_xxx` values of type ::psa_key_derivation_step_t)
* for more information.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_key_derivation_abort().
*
* \param[in,out] operation The key derivation operation object to use.
* It must have been set up with
* psa_key_derivation_setup() and must not
* have produced any output yet.
* \param step Which step the input data is for.
* \param[in] data Input data to use.
* \param data_length Size of the \p data buffer in bytes.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \c step is not compatible with the operation's algorithm.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \c step does not allow direct inputs.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid for this input \p step.
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_key_derivation_input_bytes(
psa_key_derivation_operation_t *operation,
psa_key_derivation_step_t step,
const uint8_t *data,
size_t data_length);
/** Provide a numeric input for key derivation or key agreement.
*
* Which inputs are required and in what order depends on the algorithm.
* However, when an algorithm requires a particular order, numeric inputs
* usually come first as they tend to be configuration parameters.
* Refer to the documentation of each key derivation or key agreement
* algorithm for information.
*
* This function is used for inputs which are fixed-size non-negative
* integers.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_key_derivation_abort().
*
* \param[in,out] operation The key derivation operation object to use.
* It must have been set up with
* psa_key_derivation_setup() and must not
* have produced any output yet.
* \param step Which step the input data is for.
* \param[in] value The value of the numeric input.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \c step is not compatible with the operation's algorithm.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \c step does not allow numeric inputs.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid for this input \p step.
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_key_derivation_input_integer(
psa_key_derivation_operation_t *operation,
psa_key_derivation_step_t step,
uint64_t value);
/** Provide an input for key derivation in the form of a key.
*
* Which inputs are required and in what order depends on the algorithm.
* Refer to the documentation of each key derivation or key agreement
* algorithm for information.
*
* This function obtains input from a key object, which is usually correct for
* secret inputs or for non-secret personalization strings kept in the key
* store. To pass a non-secret parameter which is not in the key store,
* call psa_key_derivation_input_bytes() instead of this function.
* Refer to the documentation of individual step types
* (`PSA_KEY_DERIVATION_INPUT_xxx` values of type ::psa_key_derivation_step_t)
* for more information.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_key_derivation_abort().
*
* \param[in,out] operation The key derivation operation object to use.
* It must have been set up with
* psa_key_derivation_setup() and must not
* have produced any output yet.
* \param step Which step the input data is for.
* \param key Identifier of the key. It must have an
* appropriate type for step and must allow the
* usage #PSA_KEY_USAGE_DERIVE or
* #PSA_KEY_USAGE_VERIFY_DERIVATION (see note)
* and the algorithm used by the operation.
*
* \note Once all inputs steps are completed, the operations will allow:
* - psa_key_derivation_output_bytes() if each input was either a direct input
* or a key with #PSA_KEY_USAGE_DERIVE set;
* - psa_key_derivation_output_key() if the input for step
* #PSA_KEY_DERIVATION_INPUT_SECRET or #PSA_KEY_DERIVATION_INPUT_PASSWORD
* was from a key slot with #PSA_KEY_USAGE_DERIVE and each other input was
* either a direct input or a key with #PSA_KEY_USAGE_DERIVE set;
* - psa_key_derivation_verify_bytes() if each input was either a direct input
* or a key with #PSA_KEY_USAGE_VERIFY_DERIVATION set;
* - psa_key_derivation_verify_key() under the same conditions as
* psa_key_derivation_verify_bytes().
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* The key allows neither #PSA_KEY_USAGE_DERIVE nor
* #PSA_KEY_USAGE_VERIFY_DERIVATION, or it doesn't allow this
* algorithm.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \c step is not compatible with the operation's algorithm.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \c step does not allow key inputs of the given type
* or does not allow key inputs at all.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid for this input \p step.
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_key_derivation_input_key(
psa_key_derivation_operation_t *operation,
psa_key_derivation_step_t step,
psa_key_id_t key);
/** Perform a key agreement and use the shared secret as input to a key
* derivation.
*
* A key agreement algorithm takes two inputs: a private key \p private_key
* a public key \p peer_key.
* The result of this function is passed as input to a key derivation.
* The output of this key derivation can be extracted by reading from the
* resulting operation to produce keys and other cryptographic material.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_key_derivation_abort().
*
* \param[in,out] operation The key derivation operation object to use.
* It must have been set up with
* psa_key_derivation_setup() with a
* key agreement and derivation algorithm
* \c alg (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_KEY_AGREEMENT(\c alg) is true
* and #PSA_ALG_IS_RAW_KEY_AGREEMENT(\c alg)
* is false).
* The operation must be ready for an
* input of the type given by \p step.
* \param step Which step the input data is for.
* \param private_key Identifier of the private key to use. It must
* allow the usage #PSA_KEY_USAGE_DERIVE.
* \param[in] peer_key Public key of the peer. The peer key must be in the
* same format that psa_import_key() accepts for the
* public key type corresponding to the type of
* private_key. That is, this function performs the
* equivalent of
* #psa_import_key(...,
* `peer_key`, `peer_key_length`) where
* with key attributes indicating the public key
* type corresponding to the type of `private_key`.
* For example, for EC keys, this means that peer_key
* is interpreted as a point on the curve that the
* private key is on. The standard formats for public
* keys are documented in the documentation of
* psa_export_public_key().
* \param peer_key_length Size of \p peer_key in bytes.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid for this key agreement \p step.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \c private_key is not compatible with \c alg,
* or \p peer_key is not valid for \c alg or not compatible with
* \c private_key.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \c alg is not supported or is not a key derivation algorithm.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \c step does not allow an input resulting from a key agreement.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_key_derivation_key_agreement(
psa_key_derivation_operation_t *operation,
psa_key_derivation_step_t step,
psa_key_id_t private_key,
const uint8_t *peer_key,
size_t peer_key_length);
/** Read some data from a key derivation operation.
*
* This function calculates output bytes from a key derivation algorithm and
* return those bytes.
* If you view the key derivation's output as a stream of bytes, this
* function destructively reads the requested number of bytes from the
* stream.
* The operation's capacity decreases by the number of bytes read.
*
* If this function returns an error status other than
* #PSA_ERROR_INSUFFICIENT_DATA, the operation enters an error
* state and must be aborted by calling psa_key_derivation_abort().
*
* \param[in,out] operation The key derivation operation object to read from.
* \param[out] output Buffer where the output will be written.
* \param output_length Number of bytes to output.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_NOT_PERMITTED
* One of the inputs was a key whose policy didn't allow
* #PSA_KEY_USAGE_DERIVE.
* \retval #PSA_ERROR_INSUFFICIENT_DATA
* The operation's capacity was less than
* \p output_length bytes. Note that in this case,
* no output is written to the output buffer.
* The operation's capacity is set to 0, thus
* subsequent calls to this function will not
* succeed, even with a smaller output buffer.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active and completed
* all required input steps).
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_key_derivation_output_bytes(
psa_key_derivation_operation_t *operation,
uint8_t *output,
size_t output_length);
/** Derive a key from an ongoing key derivation operation.
*
* This function calculates output bytes from a key derivation algorithm
* and uses those bytes to generate a key deterministically.
* The key's location, usage policy, type and size are taken from
* \p attributes.
*
* If you view the key derivation's output as a stream of bytes, this
* function destructively reads as many bytes as required from the
* stream.
* The operation's capacity decreases by the number of bytes read.
*
* If this function returns an error status other than
* #PSA_ERROR_INSUFFICIENT_DATA, the operation enters an error
* state and must be aborted by calling psa_key_derivation_abort().
*
* How much output is produced and consumed from the operation, and how
* the key is derived, depends on the key type and on the key size
* (denoted \c bits below):
*
* - For key types for which the key is an arbitrary sequence of bytes
* of a given size, this function is functionally equivalent to
* calling #psa_key_derivation_output_bytes
* and passing the resulting output to #psa_import_key.
* However, this function has a security benefit:
* if the implementation provides an isolation boundary then
* the key material is not exposed outside the isolation boundary.
* As a consequence, for these key types, this function always consumes
* exactly (\c bits / 8) bytes from the operation.
* The following key types defined in this specification follow this scheme:
*
* - #PSA_KEY_TYPE_AES;
* - #PSA_KEY_TYPE_CAMELLIA;
* - #PSA_KEY_TYPE_DERIVE;
* - #PSA_KEY_TYPE_HMAC;
* - #PSA_KEY_TYPE_PASSWORD_HASH.
*
* - For ECC keys on a Montgomery elliptic curve
* (#PSA_KEY_TYPE_ECC_KEY_PAIR(\c curve) where \c curve designates a
* Montgomery curve), this function always draws a byte string whose
* length is determined by the curve, and sets the mandatory bits
* accordingly. That is:
*
* - Curve25519 (#PSA_ECC_FAMILY_MONTGOMERY, 255 bits): draw a 32-byte
* string and process it as specified in RFC 7748 §5.
* - Curve448 (#PSA_ECC_FAMILY_MONTGOMERY, 448 bits): draw a 56-byte
* string and process it as specified in RFC 7748 §5.
*
* - For key types for which the key is represented by a single sequence of
* \c bits bits with constraints as to which bit sequences are acceptable,
* this function draws a byte string of length (\c bits / 8) bytes rounded
* up to the nearest whole number of bytes. If the resulting byte string
* is acceptable, it becomes the key, otherwise the drawn bytes are discarded.
* This process is repeated until an acceptable byte string is drawn.
* The byte string drawn from the operation is interpreted as specified
* for the output produced by psa_export_key().
* The following key types defined in this specification follow this scheme:
*
* - #PSA_KEY_TYPE_DES.
* Force-set the parity bits, but discard forbidden weak keys.
* For 2-key and 3-key triple-DES, the three keys are generated
* successively (for example, for 3-key triple-DES,
* if the first 8 bytes specify a weak key and the next 8 bytes do not,
* discard the first 8 bytes, use the next 8 bytes as the first key,
* and continue reading output from the operation to derive the other
* two keys).
* - Finite-field Diffie-Hellman keys (#PSA_KEY_TYPE_DH_KEY_PAIR(\c group)
* where \c group designates any Diffie-Hellman group) and
* ECC keys on a Weierstrass elliptic curve
* (#PSA_KEY_TYPE_ECC_KEY_PAIR(\c curve) where \c curve designates a
* Weierstrass curve).
* For these key types, interpret the byte string as integer
* in big-endian order. Discard it if it is not in the range
* [0, *N* - 2] where *N* is the boundary of the private key domain
* (the prime *p* for Diffie-Hellman, the subprime *q* for DSA,
* or the order of the curve's base point for ECC).
* Add 1 to the resulting integer and use this as the private key *x*.
* This method allows compliance to NIST standards, specifically
* the methods titled "key-pair generation by testing candidates"
* in NIST SP 800-56A §5.6.1.1.4 for Diffie-Hellman,
* in FIPS 186-4 §B.1.2 for DSA, and
* in NIST SP 800-56A §5.6.1.2.2 or
* FIPS 186-4 §B.4.2 for elliptic curve keys.
*
* - For other key types, including #PSA_KEY_TYPE_RSA_KEY_PAIR,
* the way in which the operation output is consumed is
* implementation-defined.
*
* In all cases, the data that is read is discarded from the operation.
* The operation's capacity is decreased by the number of bytes read.
*
* For algorithms that take an input step #PSA_KEY_DERIVATION_INPUT_SECRET,
* the input to that step must be provided with psa_key_derivation_input_key().
* Future versions of this specification may include additional restrictions
* on the derived key based on the attributes and strength of the secret key.
*
* \param[in] attributes The attributes for the new key.
* If the key type to be created is
* #PSA_KEY_TYPE_PASSWORD_HASH then the algorithm in
* the policy must be the same as in the current
* operation.
* \param[in,out] operation The key derivation operation object to read from.
* \param[out] key On success, an identifier for the newly created
* key. For persistent keys, this is the key
* identifier defined in \p attributes.
* \c 0 on failure.
*
* \retval #PSA_SUCCESS
* Success.
* If the key is persistent, the key material and the key's metadata
* have been saved to persistent storage.
* \retval #PSA_ERROR_ALREADY_EXISTS
* This is an attempt to create a persistent key, and there is
* already a persistent key with the given identifier.
* \retval #PSA_ERROR_INSUFFICIENT_DATA
* There was not enough data to create the desired key.
* Note that in this case, no output is written to the output buffer.
* The operation's capacity is set to 0, thus subsequent calls to
* this function will not succeed, even with a smaller output buffer.
* \retval #PSA_ERROR_NOT_SUPPORTED
* The key type or key size is not supported, either by the
* implementation in general or in this particular location.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The provided key attributes are not valid for the operation.
* \retval #PSA_ERROR_NOT_PERMITTED
* The #PSA_KEY_DERIVATION_INPUT_SECRET or
* #PSA_KEY_DERIVATION_INPUT_PASSWORD input was not provided through a
* key; or one of the inputs was a key whose policy didn't allow
* #PSA_KEY_USAGE_DERIVE.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active and completed
* all required input steps).
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_INSUFFICIENT_STORAGE
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_DATA_INVALID
* \retval #PSA_ERROR_DATA_CORRUPT
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_key_derivation_output_key(
const psa_key_attributes_t *attributes,
psa_key_derivation_operation_t *operation,
psa_key_id_t *key);
/** Compare output data from a key derivation operation to an expected value.
*
* This function calculates output bytes from a key derivation algorithm and
* compares those bytes to an expected value in constant time.
* If you view the key derivation's output as a stream of bytes, this
* function destructively reads the expected number of bytes from the
* stream before comparing them.
* The operation's capacity decreases by the number of bytes read.
*
* This is functionally equivalent to the following code:
* \code
* psa_key_derivation_output_bytes(operation, tmp, output_length);
* if (memcmp(output, tmp, output_length) != 0)
* return PSA_ERROR_INVALID_SIGNATURE;
* \endcode
* except (1) it works even if the key's policy does not allow outputting the
* bytes, and (2) the comparison will be done in constant time.
*
* If this function returns an error status other than
* #PSA_ERROR_INSUFFICIENT_DATA or #PSA_ERROR_INVALID_SIGNATURE,
* the operation enters an error state and must be aborted by calling
* psa_key_derivation_abort().
*
* \param[in,out] operation The key derivation operation object to read from.
* \param[in] expected_output Buffer containing the expected derivation output.
* \param output_length Length ot the expected output; this is also the
* number of bytes that will be read.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INVALID_SIGNATURE
* The output was read successfully, but it differs from the expected
* output.
* \retval #PSA_ERROR_NOT_PERMITTED
* One of the inputs was a key whose policy didn't allow
* #PSA_KEY_USAGE_VERIFY_DERIVATION.
* \retval #PSA_ERROR_INSUFFICIENT_DATA
* The operation's capacity was less than
* \p output_length bytes. Note that in this case,
* the operation's capacity is set to 0, thus
* subsequent calls to this function will not
* succeed, even with a smaller expected output.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active and completed
* all required input steps).
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_key_derivation_verify_bytes(
psa_key_derivation_operation_t *operation,
const uint8_t *expected_output,
size_t output_length);
/** Compare output data from a key derivation operation to an expected value
* stored in a key object.
*
* This function calculates output bytes from a key derivation algorithm and
* compares those bytes to an expected value, provided as key of type
* #PSA_KEY_TYPE_PASSWORD_HASH.
* If you view the key derivation's output as a stream of bytes, this
* function destructively reads the number of bytes corresponding the the
* length of the expected value from the stream before comparing them.
* The operation's capacity decreases by the number of bytes read.
*
* This is functionally equivalent to exporting the key and calling
* psa_key_derivation_verify_bytes() on the result, except that it
* works even if the key cannot be exported.
*
* If this function returns an error status other than
* #PSA_ERROR_INSUFFICIENT_DATA or #PSA_ERROR_INVALID_SIGNATURE,
* the operation enters an error state and must be aborted by calling
* psa_key_derivation_abort().
*
* \param[in,out] operation The key derivation operation object to read from.
* \param[in] expected A key of type #PSA_KEY_TYPE_PASSWORD_HASH
* containing the expected output. Its policy must
* include the #PSA_KEY_USAGE_VERIFY_DERIVATION flag
* and the permitted algorithm must match the
* operation. The value of this key was likely
* computed by a previous call to
* psa_key_derivation_output_key().
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INVALID_SIGNATURE
* The output was read successfully, but if differs from the expected
* output.
* \retval #PSA_ERROR_INVALID_HANDLE
* The key passed as the expected value does not exist.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The key passed as the expected value has an invalid type.
* \retval #PSA_ERROR_NOT_PERMITTED
* The key passed as the expected value does not allow this usage or
* this algorithm; or one of the inputs was a key whose policy didn't
* allow #PSA_KEY_USAGE_VERIFY_DERIVATION.
* \retval #PSA_ERROR_INSUFFICIENT_DATA
* The operation's capacity was less than
* the length of the expected value. In this case,
* the operation's capacity is set to 0, thus
* subsequent calls to this function will not
* succeed, even with a smaller expected output.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active and completed
* all required input steps).
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_key_derivation_verify_key(
psa_key_derivation_operation_t *operation,
psa_key_id_t expected);
/** Abort a key derivation operation.
*
* Aborting an operation frees all associated resources except for the \c
* operation structure itself. Once aborted, the operation object can be reused
* for another operation by calling psa_key_derivation_setup() again.
*
* This function may be called at any time after the operation
* object has been initialized as described in #psa_key_derivation_operation_t.
*
* In particular, it is valid to call psa_key_derivation_abort() twice, or to
* call psa_key_derivation_abort() on an operation that has not been set up.
*
* \param[in,out] operation The operation to abort.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_key_derivation_abort(
psa_key_derivation_operation_t *operation);
/** Perform a key agreement and return the raw shared secret.
*
* \warning The raw result of a key agreement algorithm such as finite-field
* Diffie-Hellman or elliptic curve Diffie-Hellman has biases and should
* not be used directly as key material. It should instead be passed as
* input to a key derivation algorithm. To chain a key agreement with
* a key derivation, use psa_key_derivation_key_agreement() and other
* functions from the key derivation interface.
*
* \param alg The key agreement algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_RAW_KEY_AGREEMENT(\p alg)
* is true).
* \param private_key Identifier of the private key to use. It must
* allow the usage #PSA_KEY_USAGE_DERIVE.
* \param[in] peer_key Public key of the peer. It must be
* in the same format that psa_import_key()
* accepts. The standard formats for public
* keys are documented in the documentation
* of psa_export_public_key().
* \param peer_key_length Size of \p peer_key in bytes.
* \param[out] output Buffer where the decrypted message is to
* be written.
* \param output_size Size of the \c output buffer in bytes.
* \param[out] output_length On success, the number of bytes
* that make up the returned output.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p alg is not a key agreement algorithm
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p private_key is not compatible with \p alg,
* or \p peer_key is not valid for \p alg or not compatible with
* \p private_key.
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* \p output_size is too small
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not a supported key agreement algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_raw_key_agreement(psa_algorithm_t alg,
psa_key_id_t private_key,
const uint8_t *peer_key,
size_t peer_key_length,
uint8_t *output,
size_t output_size,
size_t *output_length);
/**@}*/
/** \defgroup random Random generation
* @{
*/
/**
* \brief Generate random bytes.
*
* \warning This function **can** fail! Callers MUST check the return status
* and MUST NOT use the content of the output buffer if the return
* status is not #PSA_SUCCESS.
*
* \note To generate a key, use psa_generate_key() instead.
*
* \param[out] output Output buffer for the generated data.
* \param output_size Number of bytes to generate and output.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_generate_random(uint8_t *output,
size_t output_size);
/**
* \brief Generate a key or key pair.
*
* The key is generated randomly.
* Its location, usage policy, type and size are taken from \p attributes.
*
* Implementations must reject an attempt to generate a key of size 0.
*
* The following type-specific considerations apply:
* - For RSA keys (#PSA_KEY_TYPE_RSA_KEY_PAIR),
* the public exponent is 65537.
* The modulus is a product of two probabilistic primes
* between 2^{n-1} and 2^n where n is the bit size specified in the
* attributes.
*
* \param[in] attributes The attributes for the new key.
* \param[out] key On success, an identifier for the newly created
* key. For persistent keys, this is the key
* identifier defined in \p attributes.
* \c 0 on failure.
*
* \retval #PSA_SUCCESS
* Success.
* If the key is persistent, the key material and the key's metadata
* have been saved to persistent storage.
* \retval #PSA_ERROR_ALREADY_EXISTS
* This is an attempt to create a persistent key, and there is
* already a persistent key with the given identifier.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_INSUFFICIENT_STORAGE
* \retval #PSA_ERROR_DATA_INVALID
* \retval #PSA_ERROR_DATA_CORRUPT
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_generate_key(const psa_key_attributes_t *attributes,
psa_key_id_t *key);
/**@}*/
#ifdef __cplusplus
}
#endif
/* The file "crypto_sizes.h" contains definitions for size calculation
* macros whose definitions are implementation-specific. */
#include "psa/crypto_sizes.h"
/* The file "crypto_client_struct.h" contains definitions for structures
* whose definitions differ in the client view and the PSA server
* implementation in TF-M. */
#include "psa/crypto_client_struct.h"
/* The file "crypto_struct.h" contains definitions for
* implementation-specific structs that are declared above. */
#include "psa/crypto_struct.h"
/* The file "crypto_extra.h" contains vendor-specific definitions. This
* can include vendor-defined algorithms, extra functions, etc. */
#include "psa/crypto_extra.h"
#endif /* PSA_CRYPTO_H */