/**
 * \file rsa_alt.h
 *
 * \brief This file provides an API for the RSA public-key cryptosystem.
 *
 * The RSA public-key cryptosystem is defined in <em>Public-Key
 * Cryptography Standards (PKCS) #1 v1.5: RSA Encryption</em>
 * and <em>Public-Key Cryptography Standards (PKCS) #1 v2.1:
 * RSA Cryptography Specifications</em>.
 *
 */
/*
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0
 *
 *  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_RSA_ALT_H
#define MBEDTLS_RSA_ALT_H

#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif

#include "mbedtls/bignum.h"
#include "mbedtls/md.h"

#if defined(MBEDTLS_THREADING_C)
#include "mbedtls/threading.h"
#endif

#ifdef __cplusplus
extern "C" {
#endif

#if defined(MBEDTLS_RSA_ALT)
// Regular implementation
//

/* Enable Nuvoton's Crypto RSA H/W */
#define NU_CRYPTO_RSA_ENABLE

/**
 * \brief   The RSA context structure.
 *
 * \note    Direct manipulation of the members of this structure
 *          is deprecated. All manipulation should instead be done through
 *          the public interface functions.
 */
typedef struct mbedtls_rsa_context
{
    int ver;                    /*!<  Always 0.*/
    size_t len;                 /*!<  The size of \p N in Bytes. */

    mbedtls_mpi N;              /*!<  The public modulus. */
    mbedtls_mpi E;              /*!<  The public exponent. */

    mbedtls_mpi D;              /*!<  The private exponent. */
    mbedtls_mpi P;              /*!<  The first prime factor. */
    mbedtls_mpi Q;              /*!<  The second prime factor. */

    mbedtls_mpi DP;             /*!<  <code>D % (P - 1)</code>. */
    mbedtls_mpi DQ;             /*!<  <code>D % (Q - 1)</code>. */
    mbedtls_mpi QP;             /*!<  <code>1 / (Q % P)</code>. */

    mbedtls_mpi RN;             /*!<  cached <code>R^2 mod N</code>. */

    mbedtls_mpi RP;             /*!<  cached <code>R^2 mod P</code>. */
    mbedtls_mpi RQ;             /*!<  cached <code>R^2 mod Q</code>. */

    mbedtls_mpi Vi;             /*!<  The cached blinding value. */
    mbedtls_mpi Vf;             /*!<  The cached un-blinding value. */

    int padding;                /*!< Selects padding mode:
                                     #MBEDTLS_RSA_PKCS_V15 for 1.5 padding and
                                     #MBEDTLS_RSA_PKCS_V21 for OAEP or PSS. */
    int hash_id;                /*!< Hash identifier of mbedtls_md_type_t type,
                                     as specified in md.h for use in the MGF
                                     mask generating function used in the
                                     EME-OAEP and EMSA-PSS encodings. */
#if defined(MBEDTLS_THREADING_C)
    mbedtls_threading_mutex_t mutex;    /*!<  Thread-safety mutex. */
#endif

#if defined(NU_CRYPTO_RSA_ENABLE)
    int hw_init;                /*!< Initialized Crypto RSA H/W or not. */
#endif
}
mbedtls_rsa_context;

#endif /* MBEDTLS_RSA_ALT */

#ifdef __cplusplus
}
#endif

#endif /* rsa_alt.h */