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/*******************************************************************************
* Copyright 2010-2018 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:
// Intel(R) Integrated Performance Primitives. Cryptography Primitives.
// EC over GF(p) Operations
//
// Context:
// ippsGFpECSetPointHash()
//
*/
#include "owndefs.h"
#include "owncp.h"
#include "pcpgfpecstuff.h"
#include "pcphash.h"
#include "pcphash_rmf.h"
/*F*
// Name: ippsGFpECSetPointHash
//
// Purpose: Constructs a point on an elliptic curve based on the hash of the input message
//
// Returns: Reason:
// ippStsNullPtrErr pPoint == NULL
// pEC == NULL
// pScratchBuffer == NULL
// (msgLen && !pMsg)
//
// ippStsContextMatchErr invalid pEC->idCtx
// invalid pPoint->idCtx
//
// ippStsBadArgErr !GFP_IS_BASIC(pGFE)
//
// ippStsOutOfRangeErr ECP_POINT_FELEN(pPoint)!=GFP_FELEN()
//
// ippStsQuadraticNonResidueErr square of the Y-coordinate of
// the pPoint is a quadratic non-residue modulo
//
// ippStsLengthErr msgLen<0
//
// ippStsNoErr no error
//
// Parameters:
// hdr Header of the input message
// pMsg Pointer to the input message
// msgLen Length of the input message
// pPoint Pointer to the IppsGFpECPoint context
// pEC Pointer to the context of the elliptic curve
// hashID ID of the hash algorithm used
// pScratchBuffer Pointer to the scratch buffer
//
// Note:
// Is not a fact that computed point belongs to BP-related subgroup BP
//
*F*/
IPPFUN(IppStatus, ippsGFpECSetPointHash,(Ipp32u hdr, const Ipp8u* pMsg, int msgLen, IppsGFpECPoint* pPoint,
IppsGFpECState* pEC, IppHashAlgId hashID,
Ipp8u* pScratchBuffer))
{
IppsGFpState* pGF;
gsModEngine* pGFE;
/* get algorithm id */
hashID = cpValidHashAlg(hashID);
IPP_BADARG_RET(ippHashAlg_Unknown==hashID, ippStsNotSupportedModeErr);
/* test message length */
IPP_BADARG_RET((msgLen<0), ippStsLengthErr);
/* test message pointer */
IPP_BADARG_RET((msgLen && !pMsg), ippStsNullPtrErr);
IPP_BAD_PTR3_RET(pPoint, pEC, pScratchBuffer);
pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) );
IPP_BADARG_RET( !ECP_TEST_ID(pEC), ippStsContextMatchErr );
pGF = ECP_GFP(pEC);
pGFE = GFP_PMA(pGF);
IPP_BADARG_RET( !GFP_IS_BASIC(pGFE), ippStsBadArgErr );
IPP_BADARG_RET( !ECP_POINT_TEST_ID(pPoint), ippStsContextMatchErr );
IPP_BADARG_RET( ECP_POINT_FELEN(pPoint)!=GFP_FELEN(pGFE), ippStsOutOfRangeErr);
{
int elemLen = GFP_FELEN(pGFE);
BNU_CHUNK_T* pModulus = GFP_MODULUS(pGFE);
Ipp8u md[IPP_SHA512_DIGEST_BITSIZE/BYTESIZE];
int hashLen = cpHashAlgAttr[hashID].hashSize;
BNU_CHUNK_T hashVal[BITS_BNU_CHUNK(IPP_SHA512_DIGEST_BITSIZE)+1];
int hashValLen;
IppsHashState hashCtx;
ippsHashInit(&hashCtx, hashID);
{
BNU_CHUNK_T* pPoolElm = cpGFpGetPool(1, pGFE);
/* convert hdr => hdrStr */
BNU_CHUNK_T locHdr = (BNU_CHUNK_T)hdr;
Ipp8u hdrOctStr[sizeof(hdr/*locHdr*/)];
cpToOctStr_BNU(hdrOctStr, sizeof(hdrOctStr), &locHdr, 1);
/* compute md = hash(hrd||msg) */
ippsHashUpdate(hdrOctStr, sizeof(hdrOctStr), &hashCtx);
ippsHashUpdate(pMsg, msgLen, &hashCtx);
ippsHashFinal(md, &hashCtx);
/* convert hash into the integer */
hashValLen = cpFromOctStr_BNU(hashVal, md, hashLen);
hashValLen = cpMod_BNU(hashVal, hashValLen, pModulus, elemLen);
cpGFpSet(pPoolElm, hashVal, hashValLen, pGFE);
if( gfec_MakePoint(pPoint, pPoolElm, pEC)) {
/* set y-coordinate of the point (positive or negative) */
BNU_CHUNK_T* pY = ECP_POINT_Y(pPoint);
if(pY[0] & 1)
cpGFpNeg(pY, pY, pGFE);
/* R = [cofactor]R */
if(ECP_SUBGROUP(pEC)) {
BNU_CHUNK_T* pCofactor = ECP_COFACTOR(pEC);
int cofactorLen = GFP_FELEN(pGFE);
if(!GFP_IS_ONE(pCofactor, cofactorLen))
gfec_MulPoint(pPoint, pPoint, pCofactor, cofactorLen, /*0,*/ pEC, pScratchBuffer);
}
cpGFpReleasePool(1, pGFE);
return ippStsNoErr;
}
}
cpGFpReleasePool(1, pGFE);
return ippStsQuadraticNonResidueErr;
}
}
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