linux-sgx-trts-modified/common/src/crypto_cmac_128.cpp

/*
 * 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 "crypto_wrapper.h"
#include <openssl/cmac.h>
#include <openssl/evp.h>
#include <stdint.h>
#include <assert.h>
#include <se_memcpy.h>

sgx_status_t sgx_cmac128_msg(const sgx_key_128bit_t key, const uint8_t *p_src, unsigned int src_len, sgx_mac_t *p_mac)
{
    if(!key || !p_src || src_len == 0 || !p_mac)
    {
        return SGX_ERROR_INVALID_PARAMETER;
    }
    CMAC_CTX *cmac_ctx = NULL;
    size_t mac_len;
    
    if(!(cmac_ctx = CMAC_CTX_new()))
    {
        return SGX_ERROR_OUT_OF_MEMORY;
    }
    if(!CMAC_Init(cmac_ctx, key, sizeof(sgx_key_128bit_t), EVP_aes_128_cbc(), NULL))
    {
        CMAC_CTX_free(cmac_ctx);
        return SGX_ERROR_UNEXPECTED;
    }
    if(!CMAC_Update(cmac_ctx, p_src, src_len))
    {
        CMAC_CTX_free(cmac_ctx);
        return SGX_ERROR_UNEXPECTED;
    }
       if(!CMAC_Final(cmac_ctx, (uint8_t *)p_mac, &mac_len))
    {
        CMAC_CTX_free(cmac_ctx);
        return SGX_ERROR_UNEXPECTED;
    }
    CMAC_CTX_free(cmac_ctx);
    assert(mac_len == sizeof(sgx_mac_t));
    return SGX_SUCCESS;    

}