diff options
Diffstat (limited to 'ext/ipp/sources/ippcp/pcpgfpecsetpointhash_rmf.c')
| -rw-r--r-- | ext/ipp/sources/ippcp/pcpgfpecsetpointhash_rmf.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/ext/ipp/sources/ippcp/pcpgfpecsetpointhash_rmf.c b/ext/ipp/sources/ippcp/pcpgfpecsetpointhash_rmf.c new file mode 100644 index 0000000..beebf8e --- /dev/null +++ b/ext/ipp/sources/ippcp/pcpgfpecsetpointhash_rmf.c @@ -0,0 +1,173 @@ +/******************************************************************************* +* 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_rmf() +// +*/ + +#include "owndefs.h" +#include "owncp.h" +#include "pcpgfpecstuff.h" +#include "pcphash.h" +#include "pcphash_rmf.h" + + +/*F* +// Name: ippsGFpECSetPointHash_rmf +// +// 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) +// pMethod == NULL +// +// 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 +// pMethod Pointer to the hash method +// pScratchBuffer Pointer to the scratch buffer +// +// Note: +// Is not a fact that computed point belongs to BP-related subgroup BP +// +*F*/ +IPPFUN(IppStatus, ippsGFpECSetPointHash_rmf,(Ipp32u hdr, const Ipp8u* pMsg, int msgLen, IppsGFpECPoint* pPoint, + IppsGFpECState* pEC, const IppsHashMethod* pMethod, + Ipp8u* pScratchBuffer)) +{ + IppsGFpState* pGF; + gsModEngine* pGFE; + + /* test method pointer */ + IPP_BAD_PTR1_RET(pMethod); + + /* 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 = pMethod->hashLen; + BNU_CHUNK_T hashVal[BITS_BNU_CHUNK(IPP_SHA512_DIGEST_BITSIZE)+1]; + int hashValLen; + + IppsHashState_rmf hashCtx; + ippsHashInit_rmf(&hashCtx, pMethod); + + { + 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_rmf(hdrOctStr, sizeof(hdrOctStr), &hashCtx); + ippsHashUpdate_rmf(pMsg, msgLen, &hashCtx); + ippsHashFinal_rmf(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); + + /* update point if cofactor>1 */ + if(ECP_SUBGROUP(pEC)) + gfec_MulPoint(pPoint, pPoint, ECP_COFACTOR(pEC), GFP_FELEN(pGFE), /*0,*/ pEC, pScratchBuffer); + + cpGFpReleasePool(1, pGFE); + return ippStsNoErr; + } + } + + cpGFpReleasePool(1, pGFE); + return ippStsQuadraticNonResidueErr; + } +} |