/*
 *  Copyright (c) 2017, The OpenThread Authors.
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the copyright holder nor the
 *     names of its contributors may be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef MBEDTLS_SHA256_ALT_H
#define MBEDTLS_SHA256_ALT_H

#ifndef MBEDTLS_CONFIG_FILE
#include "cc2650-mbedtls-config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif

#ifdef MBEDTLS_SHA256_ALT

#include "driverlib/rom_crypto.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @brief translating the mbedtls SHA256 workspace to the cc2650 SHA256 workspace.
 */
typedef SHA256_memory_t mbedtls_sha256_context;

/**
 * @brief Initialize SHA-256 context
 *
 * @param [in,out] ctx SHA-256 context to be initialized
 */
void mbedtls_sha256_init(mbedtls_sha256_context *ctx);

/**
 * @brief Clear SHA-256 context
 *
 * @param [in,out] ctx SHA-256 context to be cleared
 */
void mbedtls_sha256_free(mbedtls_sha256_context *ctx);

/**
 * @brief Clone (the state of) a SHA-256 context
 *
 * @param [out] dst The destination context
 * @param [in] src The context to be cloned
 */
void mbedtls_sha256_clone(mbedtls_sha256_context *dst,
                          const mbedtls_sha256_context *src);

/**
 * @brief SHA-256 context setup
 *
 * @param [in,out] ctx context to be initialized
 * @param [in] is224 0 = use SHA256, 1 = use SHA224
 */
void mbedtls_sha256_starts(mbedtls_sha256_context *ctx, int is224);

/**
 * @brief SHA-256 process buffer
 *
 * @param [in,out] ctx SHA-256 context
 * @param [in] input buffer holding the  data
 * @param [in] ilen length of the input data
 */
void mbedtls_sha256_update(mbedtls_sha256_context *ctx, const unsigned char *input, size_t ilen);

/**
 * @brief SHA-256 final digest
 *
 * @param [in,out] ctx SHA-256 context
 * @param [out] output SHA-224/256 checksum result
 */
void mbedtls_sha256_finish(mbedtls_sha256_context *ctx, unsigned char output[32]);

/* Internal use */
void mbedtls_sha256_process(mbedtls_sha256_context *ctx, const unsigned char data[64]);

#ifdef __cplusplus
}
#endif

#endif /* MBEDTLS_SHA256_ALT */

#endif /* MBEDTLS_SHA256_ALT_H */