examples/platforms/qpg6100/crypto/sha256_alt.h

/**
 * \file mbedtls_sha256.h
 *
 * \brief SHA-224 and SHA-256 cryptographic hash function
 *
 *  Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
 *
 *  This file is part of mbed TLS (https://tls.mbed.org)
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
#ifndef MBEDTLS_SHA256_ALT_H
#define MBEDTLS_SHA256_ALT_H

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

#include <stddef.h>
#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * \brief          SHA-256 context structure
 */
typedef struct
{
    uint32_t      total[2];   /*!< number of bytes processed  */
    uint32_t      state[8];   /*!< intermediate digest state  */
    unsigned char buffer[64]; /*!< data block being processed */
    int           is224;      /*!< 0 => SHA-256, else SHA-224 */
} mbedtls_sha256_context;

/**
 * \brief          This function initializes a SHA-256 context.
 *
 * \param ctx      The SHA-256 context to initialize.
 */
void mbedtls_sha256_init(mbedtls_sha256_context *ctx);

/**
 * \brief          This function clears a SHA-256 context.
 *
 * \param ctx      The SHA-256 context to clear.
 */
void mbedtls_sha256_free(mbedtls_sha256_context *ctx);

/**
 * \brief          This function clones the state of a SHA-256 context.
 *
 * \param dst      The destination context.
 * \param src      The context to clone.
 */
void mbedtls_sha256_clone(mbedtls_sha256_context *dst, const mbedtls_sha256_context *src);

/**
 * \brief          This function starts a SHA-224 or SHA-256 checksum
 *                 calculation.
 *
 * \param ctx      The context to initialize.
 * \param is224    Determines which function to use.
 *                 <ul><li>0: Use SHA-256.</li>
 *                 <li>1: Use SHA-224.</li></ul>
 *
 * \return         \c 0 on success.
 */
int mbedtls_sha256_starts_ret(mbedtls_sha256_context *ctx, int is224);

/**
 * \brief          This function feeds an input buffer into an ongoing
 *                 SHA-256 checksum calculation.
 *
 * \param ctx      SHA-256 context
 * \param input    buffer holding the data
 * \param ilen     length of the input data
 *
 * \return         \c 0 on success.
 */
int mbedtls_sha256_update_ret(mbedtls_sha256_context *ctx, const unsigned char *input, size_t ilen);

/**
 * \brief          This function finishes the SHA-256 operation, and writes
 *                 the result to the output buffer.
 *
 * \param ctx      The SHA-256 context.
 * \param output   The SHA-224 or SHA-256 checksum result.
 *
 * \return         \c 0 on success.
 */
int mbedtls_sha256_finish_ret(mbedtls_sha256_context *ctx, unsigned char output[32]);

/**
 * \brief          This function processes a single data block within
 *                 the ongoing SHA-256 computation. This function is for
 *                 internal use only.
 *
 * \param ctx      The SHA-256 context.
 * \param data     The buffer holding one block of data.
 *
 * \return         \c 0 on success.
 */
int mbedtls_internal_sha256_process(mbedtls_sha256_context *ctx, const unsigned char data[64]);

#if !defined(MBEDTLS_DEPRECATED_REMOVED)
#if defined(MBEDTLS_DEPRECATED_WARNING)
#define MBEDTLS_DEPRECATED __attribute__((deprecated))
#else
#define MBEDTLS_DEPRECATED
#endif
/**
 * \brief          This function starts a SHA-256 checksum calculation.
 *
 * \deprecated     Superseded by mbedtls_sha256_starts_ret() in 2.7.0.
 *
 * \param ctx      The SHA-256 context to initialize.
 * \param is224    Determines which function to use.
 *                 <ul><li>0: Use SHA-256.</li>
 *                 <li>1: Use SHA-224.</li></ul>
 */
MBEDTLS_DEPRECATED static inline void mbedtls_sha256_starts(mbedtls_sha256_context *ctx, int is224)
{
    mbedtls_sha256_starts_ret(ctx, is224);
}

/**
 * \brief          This function feeds an input buffer into an ongoing
 *                 SHA-256 checksum calculation.
 *
 * \deprecated     Superseded by mbedtls_sha256_update_ret() in 2.7.0.
 *
 * \param ctx      The SHA-256 context to initialize.
 * \param input    The buffer holding the data.
 * \param ilen     The length of the input data.
 */
MBEDTLS_DEPRECATED static inline void mbedtls_sha256_update(mbedtls_sha256_context *ctx,
                                                            const unsigned char *   input,
                                                            size_t                  ilen)
{
    mbedtls_sha256_update_ret(ctx, input, ilen);
}

/**
 * \brief          This function finishes the SHA-256 operation, and writes
 *                 the result to the output buffer.
 *
 * \deprecated     Superseded by mbedtls_sha256_finish_ret() in 2.7.0.
 *
 * \param ctx      The SHA-256 context.
 * \param output   The SHA-224or SHA-256 checksum result.
 */
MBEDTLS_DEPRECATED static inline void mbedtls_sha256_finish(mbedtls_sha256_context *ctx, unsigned char output[32])
{
    mbedtls_sha256_finish_ret(ctx, output);
}

/**
 * \brief          This function processes a single data block within
 *                 the ongoing SHA-256 computation. This function is for
 *                 internal use only.
 *
 * \deprecated     Superseded by mbedtls_internal_sha256_process() in 2.7.0.
 *
 * \param ctx      The SHA-256 context.
 * \param data     The buffer holding one block of data.
 */
MBEDTLS_DEPRECATED static inline void mbedtls_sha256_process(mbedtls_sha256_context *ctx, const unsigned char data[64])
{
    mbedtls_internal_sha256_process(ctx, data);
}

#undef MBEDTLS_DEPRECATED
#endif /* !MBEDTLS_DEPRECATED_REMOVED */
#ifdef __cplusplus
}
#endif

#endif