/* mbed Microcontroller Library * Copyright (c) 2015-2016 Nuvoton * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef MBEDTLS_DES_ALT_H #define MBEDTLS_DES_ALT_H #include "mbedtls/des.h" #if defined(MBEDTLS_DES_ALT) #include <stddef.h> #include <stdint.h> #ifdef __cplusplus extern "C" { #endif /** * \brief DES context structure */ typedef struct { int enc; /* 0: dec, 1: enc */ uint16_t keyopt; /* 1: All three keys are independent. * 2: K1 and K2 are independent, and K3 = K1. * 3: All three keys are identical, i.e. K1 = K2 = K3. */ uint8_t key[3][MBEDTLS_DES_KEY_SIZE]; /* 3DES keys */ } mbedtls_des_context; /** * \brief Triple-DES context structure */ typedef struct { int enc; /*!< 0: dec, 1: enc */ uint16_t keyopt; uint8_t key[3][MBEDTLS_DES_KEY_SIZE]; /*!< 3DES keys */ } mbedtls_des3_context; /** * \brief Initialize DES context * * \param ctx DES context to be initialized */ void mbedtls_des_init( mbedtls_des_context *ctx ); /** * \brief Clear DES context * * \param ctx DES context to be cleared */ void mbedtls_des_free( mbedtls_des_context *ctx ); /** * \brief Initialize Triple-DES context * * \param ctx DES3 context to be initialized */ void mbedtls_des3_init( mbedtls_des3_context *ctx ); /** * \brief Clear Triple-DES context * * \param ctx DES3 context to be cleared */ void mbedtls_des3_free( mbedtls_des3_context *ctx ); /** * \brief Set key parity on the given key to odd. * * DES keys are 56 bits long, but each byte is padded with * a parity bit to allow verification. * * \param key 8-byte secret key */ void mbedtls_des_key_set_parity( unsigned char key[MBEDTLS_DES_KEY_SIZE] ); /** * \brief Check that key parity on the given key is odd. * * DES keys are 56 bits long, but each byte is padded with * a parity bit to allow verification. * * \param key 8-byte secret key * * \return 0 is parity was ok, 1 if parity was not correct. */ int mbedtls_des_key_check_key_parity( const unsigned char key[MBEDTLS_DES_KEY_SIZE] ); /** * \brief Check that key is not a weak or semi-weak DES key * * \param key 8-byte secret key * * \return 0 if no weak key was found, 1 if a weak key was identified. */ int mbedtls_des_key_check_weak( const unsigned char key[MBEDTLS_DES_KEY_SIZE] ); /** * \brief DES key schedule (56-bit, encryption) * * \param ctx DES context to be initialized * \param key 8-byte secret key * * \return 0 */ int mbedtls_des_setkey_enc( mbedtls_des_context *ctx, const unsigned char key[MBEDTLS_DES_KEY_SIZE] ); /** * \brief DES key schedule (56-bit, decryption) * * \param ctx DES context to be initialized * \param key 8-byte secret key * * \return 0 */ int mbedtls_des_setkey_dec( mbedtls_des_context *ctx, const unsigned char key[MBEDTLS_DES_KEY_SIZE] ); /** * \brief Triple-DES key schedule (112-bit, encryption) * * \param ctx 3DES context to be initialized * \param key 16-byte secret key * * \return 0 */ int mbedtls_des3_set2key_enc( mbedtls_des3_context *ctx, const unsigned char key[MBEDTLS_DES_KEY_SIZE * 2] ); /** * \brief Triple-DES key schedule (112-bit, decryption) * * \param ctx 3DES context to be initialized * \param key 16-byte secret key * * \return 0 */ int mbedtls_des3_set2key_dec( mbedtls_des3_context *ctx, const unsigned char key[MBEDTLS_DES_KEY_SIZE * 2] ); /** * \brief Triple-DES key schedule (168-bit, encryption) * * \param ctx 3DES context to be initialized * \param key 24-byte secret key * * \return 0 */ int mbedtls_des3_set3key_enc( mbedtls_des3_context *ctx, const unsigned char key[MBEDTLS_DES_KEY_SIZE * 3] ); /** * \brief Triple-DES key schedule (168-bit, decryption) * * \param ctx 3DES context to be initialized * \param key 24-byte secret key * * \return 0 */ int mbedtls_des3_set3key_dec( mbedtls_des3_context *ctx, const unsigned char key[MBEDTLS_DES_KEY_SIZE * 3] ); /** * \brief DES-ECB block encryption/decryption * * \param ctx DES context * \param input 64-bit input block * \param output 64-bit output block * * \return 0 if successful */ int mbedtls_des_crypt_ecb( mbedtls_des_context *ctx, const unsigned char input[8], unsigned char output[8] ); #if defined(MBEDTLS_CIPHER_MODE_CBC) /** * \brief DES-CBC buffer encryption/decryption * * \note Upon exit, the content of the IV is updated so that you can * call the function same function again on the following * block(s) of data and get the same result as if it was * encrypted in one call. This allows a "streaming" usage. * If on the other hand you need to retain the contents of the * IV, you should either save it manually or use the cipher * module instead. * * \param ctx DES context * \param mode MBEDTLS_DES_ENCRYPT or MBEDTLS_DES_DECRYPT * \param length length of the input data * \param iv initialization vector (updated after use) * \param input buffer holding the input data * \param output buffer holding the output data */ int mbedtls_des_crypt_cbc( mbedtls_des_context *ctx, int mode, size_t length, unsigned char iv[8], const unsigned char *input, unsigned char *output ); #endif /* MBEDTLS_CIPHER_MODE_CBC */ /** * \brief 3DES-ECB block encryption/decryption * * \param ctx 3DES context * \param input 64-bit input block * \param output 64-bit output block * * \return 0 if successful */ int mbedtls_des3_crypt_ecb( mbedtls_des3_context *ctx, const unsigned char input[8], unsigned char output[8] ); #if defined(MBEDTLS_CIPHER_MODE_CBC) /** * \brief 3DES-CBC buffer encryption/decryption * * \note Upon exit, the content of the IV is updated so that you can * call the function same function again on the following * block(s) of data and get the same result as if it was * encrypted in one call. This allows a "streaming" usage. * If on the other hand you need to retain the contents of the * IV, you should either save it manually or use the cipher * module instead. * * \param ctx 3DES context * \param mode MBEDTLS_DES_ENCRYPT or MBEDTLS_DES_DECRYPT * \param length length of the input data * \param iv initialization vector (updated after use) * \param input buffer holding the input data * \param output buffer holding the output data * * \return 0 if successful, or MBEDTLS_ERR_DES_INVALID_INPUT_LENGTH */ int mbedtls_des3_crypt_cbc( mbedtls_des3_context *ctx, int mode, size_t length, unsigned char iv[8], const unsigned char *input, unsigned char *output ); #endif /* MBEDTLS_CIPHER_MODE_CBC */ /** * \brief Internal function for key expansion. * (Only exposed to allow overriding it, * see MBEDTLS_DES_SETKEY_ALT) * * \param SK Round keys * \param key Base key */ void mbedtls_des_setkey( uint32_t SK[32], const unsigned char key[MBEDTLS_DES_KEY_SIZE] ); #ifdef __cplusplus } #endif #endif /* MBEDTLS_DES_ALT */ #endif /* des_alt.h */