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/*******************************************************************************
* Copyright 2016-2018 Intel Corporation
* All Rights Reserved.
*
* If this software was obtained under the Intel Simplified Software License,
* the following terms apply:
*
* The source code, information and material ("Material") contained herein is
* owned by Intel Corporation or its suppliers or licensors, and title to such
* Material remains with Intel Corporation or its suppliers or licensors. The
* Material contains proprietary information of Intel or its suppliers and
* licensors. The Material is protected by worldwide copyright laws and treaty
* provisions. No part of the Material may be used, copied, reproduced,
* modified, published, uploaded, posted, transmitted, distributed or disclosed
* in any way without Intel's prior express written permission. No license under
* any patent, copyright or other intellectual property rights in the Material
* is granted to or conferred upon you, either expressly, by implication,
* inducement, estoppel or otherwise. Any license under such intellectual
* property rights must be express and approved by Intel in writing.
*
* Unless otherwise agreed by Intel in writing, you may not remove or alter this
* notice or any other notice embedded in Materials by Intel or Intel's
* suppliers or licensors in any way.
*
*
* If this software was obtained under the Apache License, Version 2.0 (the
* "License"), the following terms apply:
*
* You may not use this file except in compliance with the License. You may
* obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
*
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*
* See the License for the specific language governing permissions and
* limitations under the License.
*******************************************************************************/
/*
// Purpose:
// Cryptography Primitive.
// HASH based Mask Generation Functions
//
// Contents:
// ippsMGF2_rmf()
//
*/
#include "owndefs.h"
#include "owncp.h"
#include "pcphash_rmf.h"
#include "pcptool.h"
/*F*
// Name: ippsMGF2
//
// Purpose: Mask Generation Functios.
//
// Returns: Reason:
// ippStsNullPtrErr pMask == NULL
// pMethod ==NULL
// ippStsLengthErr seedLen <0
// maskLen <0
// ippStsNoErr no errors
//
// Parameters:
// pSeed pointer to the input stream
// seedLen input stream length (bytes)
// pMaske pointer to the ouput mask
// maskLen desired length of mask (bytes)
// pMethod hash method
//
//
// Note.
// MGF1 defined in the IEEE P1363 standard.
// MGF1 defined in the ANSI X9.63 standard and frequently called KDF (key Generation Function).
// The fifference between MGF1 and MGF2 is negligible - counter i runs from 0 (in MGF1) and from 1 (in MGF2)
*F*/
IPPFUN(IppStatus, ippsMGF2_rmf,(const Ipp8u* pSeed, int seedLen, Ipp8u* pMask, int maskLen, const IppsHashMethod* pMethod))
{
IPP_BAD_PTR2_RET(pMask, pMethod);
IPP_BADARG_RET((seedLen<0)||(maskLen<0), ippStsLengthErr);
{
/* hash specific */
int hashSize = pMethod->hashLen;
int i, outLen;
__ALIGN8 IppsHashState_rmf hashCtx;
ippsHashInit_rmf(&hashCtx, pMethod);
if(!pSeed)
seedLen = 0;
for(i=1,outLen=0; outLen<maskLen; i++) { /* counter i runs from 1 */
Ipp8u cnt[4];
cnt[0] = (Ipp8u)((i>>24) & 0xFF);
cnt[1] = (Ipp8u)((i>>16) & 0xFF);
cnt[2] = (Ipp8u)((i>>8) & 0xFF);
cnt[3] = (Ipp8u)(i & 0xFF);
ippsHashUpdate_rmf(pSeed, seedLen, &hashCtx);
ippsHashUpdate_rmf(cnt, 4, &hashCtx);
if((outLen + hashSize) <= maskLen) {
ippsHashFinal_rmf(pMask+outLen, &hashCtx);
outLen += hashSize;
}
else {
Ipp8u md[MAX_HASH_SIZE];
ippsHashFinal_rmf(md, &hashCtx);
CopyBlock(md, pMask+outLen, maskLen-outLen);
outLen = maskLen;
}
}
return ippStsNoErr;
}
}
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