/*
 * Copyright (C) 2011-2018 Intel Corporation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * 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.
 *   * Neither the name of Intel Corporation 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
 * OWNER 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 INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include "se_tcrypto_common.h"
#include <openssl/sha.h>
#include <openssl/err.h>
#include "sgx_tcrypto.h"

/* SHA Hashing functions
* Parameters:
*   Return: sgx_status_t  - SGX_SUCCESS or failure as defined sgx_error.h
*   Inputs: uint8_t *p_src - Pointer to input stream to be hashed
*           uint32_t src_len - Length of input stream to be hashed
*   Output: sgx_sha256_hash_t *p_hash - Resultant hash from operation */
sgx_status_t sgx_sha256_msg(const uint8_t *p_src, uint32_t src_len, sgx_sha256_hash_t *p_hash)
{
    if ((p_src == NULL) || (p_hash == NULL))
    {
        return SGX_ERROR_INVALID_PARAMETER;
    }

    sgx_status_t retval = SGX_ERROR_UNEXPECTED;
    CLEAR_OPENSSL_ERROR_QUEUE;

    do {
	    /* generates digest of p_src */
	    if (SHA256((const unsigned char *)p_src, src_len, (unsigned char *)p_hash) == NULL) {
		GET_LAST_OPENSSL_ERROR;
		break;
	    }

	    retval = SGX_SUCCESS;
    } while(0);


    return retval;
}