linux-sgx-trts-modified/common/src/ipp_bn.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.
 *
 */


/** 
* File: 
*		ipp_bn.cpp
*Description: 
*		Wrappers for Big number generation and free functions
* 
*/



#include "ipp_wrapper.h"

#include <stdlib.h>
#include <string.h>

#ifndef _TLIBC_CDECL_
extern "C" int memset_s(void *s, size_t smax, int c, size_t n);
#endif

extern "C" IppStatus 
    newBN(const Ipp32u *data, int size_in_bytes, IppsBigNumState **p_new_BN)
{
    IppsBigNumState *pBN=0;
    int bn_size = 0;

    if(p_new_BN == NULL || size_in_bytes <= 0 || size_in_bytes % sizeof(Ipp32u))
        return ippStsBadArgErr;

    /* Get the size of the IppsBigNumState context in bytes */
    IppStatus error_code = ippsBigNumGetSize(size_in_bytes/(int)sizeof(Ipp32u), &bn_size);
    if(error_code != ippStsNoErr)
    {
        *p_new_BN = 0;
        return error_code;
    }
    pBN = (IppsBigNumState *) malloc(bn_size); 
    if(!pBN)
    {
        error_code = ippStsMemAllocErr;
        *p_new_BN = 0;
        return error_code;
    }
    /* Initializes context and partitions allocated buffer */
    error_code = ippsBigNumInit(size_in_bytes/(int)sizeof(Ipp32u), pBN);
    if(error_code != ippStsNoErr)
    {
        SAFE_FREE_MM(pBN);
        *p_new_BN = 0;
        return error_code;
    }
    if(data)
    {
        error_code = ippsSet_BN(IppsBigNumPOS, size_in_bytes/(int)sizeof(Ipp32u), data, pBN);
        if(error_code != ippStsNoErr)
        {
            SAFE_FREE_MM(pBN);
            *p_new_BN = 0;
            return error_code;
        }
    }
    *p_new_BN = pBN;
    return error_code;

}


extern "C" void secure_free_BN(IppsBigNumState *pBN, int size_in_bytes)
{
    if(pBN == NULL || size_in_bytes <= 0  || size_in_bytes % sizeof(Ipp32u))
    {
        if(pBN)
        {
            free(pBN);
        }
        return;
    }

    int bn_size = 0;

    /* Get the size of the IppsBigNumState context in bytes
     * Since we have checked the size_in_bytes before and the &bn_size is not NULL, 
     * ippsBigNumGetSize never returns failure
     */
    if(ippsBigNumGetSize(size_in_bytes/(int)sizeof(Ipp32u), &bn_size) != ippStsNoErr)
    {
        free(pBN);
        return;
    }
    /* Clear the buffer before free. */
    memset_s(pBN, bn_size, 0, bn_size);
    free(pBN);
    return;
}