linux-sgx-trts-modified/sdk/tlibcrypto/sgx_sha256_msg.cpp

/*
 * Copyright (C) 2011-2016 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:
 *
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 *   * Redistributions in binary form must reproduce the above copyright
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 *     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
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#include "sgx_tcrypto.h"
#include "ippcp.h"
#include "stdlib.h"

#ifndef SAFE_FREE
#define SAFE_FREE(ptr) {if (NULL != (ptr)) {free(ptr); (ptr)=NULL;}}
#endif


/* 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;
    }

    IppStatus ipp_ret = ippStsNoErr;
    ipp_ret = ippsHashMessage((const Ipp8u *) p_src, src_len, (Ipp8u *)p_hash, IPP_ALG_HASH_SHA256);
    switch (ipp_ret)
    {
    case ippStsNoErr: return SGX_SUCCESS;
    case ippStsMemAllocErr: return SGX_ERROR_OUT_OF_MEMORY;
    case ippStsNullPtrErr:
    case ippStsLengthErr: return SGX_ERROR_INVALID_PARAMETER;
    default: return SGX_ERROR_UNEXPECTED;
    }
}