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Diffstat (limited to 'ext/ipp/sources/ippcp/pcpeccpverifydsaca.c')
| -rw-r--r-- | ext/ipp/sources/ippcp/pcpeccpverifydsaca.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/ext/ipp/sources/ippcp/pcpeccpverifydsaca.c b/ext/ipp/sources/ippcp/pcpeccpverifydsaca.c new file mode 100644 index 0000000..5b6df37 --- /dev/null +++ b/ext/ipp/sources/ippcp/pcpeccpverifydsaca.c @@ -0,0 +1,198 @@ +/******************************************************************************* +* Copyright 2003-2018 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. +// EC over Prime Finite Field (Verify Signature, DSA version) +// +// Contents: +// ippsECCPVerifyDSA() +// +*/ + +#include "owndefs.h" +#include "owncp.h" +#include "pcpeccp.h" + + +/*F* +// Name: ippsECCPVerifyDSA +// +// Purpose: Verify Signature (DSA version). +// +// Returns: Reason: +// ippStsNullPtrErr NULL == pEC +// NULL == pMsgDigest +// NULL == pSignX +// NULL == pSignY +// NULL == pResult +// +// ippStsContextMatchErr illegal pEC->idCtx +// illegal pMsgDigest->idCtx +// illegal pSignX->idCtx +// illegal pSignY->idCtx +// +// ippStsMessageErr MsgDigest >= order +// MsgDigest < 0 +// +// ippStsRangeErr SignX < 0 or SignY < 0 +// +// ippStsNoErr no errors +// +// Parameters: +// pMsgDigest pointer to the message representative to be signed +// pSignX,pSignY pointer to the signature +// pResult pointer to the result: ippECValid/ippECInvalidSignature +// pEC pointer to the ECCP context +// +// Note: +// - signer's key must be set up in ECCP context +// before ippsECCPVerifyDSA() usage +// +*F*/ +IPPFUN(IppStatus, ippsECCPVerifyDSA,(const IppsBigNumState* pMsgDigest, + const IppsBigNumState* pSignX, const IppsBigNumState* pSignY, + IppECResult* pResult, + IppsECCPState* pEC)) +{ + /* use aligned EC context */ + IPP_BAD_PTR1_RET(pEC); + pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) ); + IPP_BADARG_RET(!ECP_TEST_ID(pEC), ippStsContextMatchErr); + + /* test message representative */ + IPP_BAD_PTR1_RET(pMsgDigest); + pMsgDigest = (IppsBigNumState*)( IPP_ALIGNED_PTR(pMsgDigest, BN_ALIGNMENT) ); + IPP_BADARG_RET(!BN_VALID_ID(pMsgDigest), ippStsContextMatchErr); + IPP_BADARG_RET(BN_NEGATIVE(pMsgDigest), ippStsMessageErr); + + /* test result */ + IPP_BAD_PTR1_RET(pResult); + + /* test signature */ + IPP_BAD_PTR2_RET(pSignX,pSignY); + pSignX = (IppsBigNumState*)( IPP_ALIGNED_PTR(pSignX, BN_ALIGNMENT) ); + pSignY = (IppsBigNumState*)( IPP_ALIGNED_PTR(pSignY, BN_ALIGNMENT) ); + IPP_BADARG_RET(!BN_VALID_ID(pSignX), ippStsContextMatchErr); + IPP_BADARG_RET(!BN_VALID_ID(pSignY), ippStsContextMatchErr); + IPP_BADARG_RET(BN_NEGATIVE(pSignX), ippStsRangeErr); + IPP_BADARG_RET(BN_NEGATIVE(pSignY), ippStsRangeErr); + + { + IppECResult vResult = ippECInvalidSignature; + + gsModEngine* pModEngine = ECP_MONT_R(pEC); + BNU_CHUNK_T* pOrder = MOD_MODULUS(pModEngine); + int orderLen = MOD_LEN(pModEngine); + + /* test input message value */ + IPP_BADARG_RET(0<=cpCmp_BNU(BN_NUMBER(pMsgDigest), BN_SIZE(pMsgDigest), pOrder, orderLen), ippStsMessageErr); + + /* test signature value */ + if(!cpEqu_BNU_CHUNK(BN_NUMBER(pSignX), BN_SIZE(pSignX), 0) && + !cpEqu_BNU_CHUNK(BN_NUMBER(pSignY), BN_SIZE(pSignY), 0) && + 0>cpCmp_BNU(BN_NUMBER(pSignX), BN_SIZE(pSignX), pOrder, orderLen) && + 0>cpCmp_BNU(BN_NUMBER(pSignY), BN_SIZE(pSignY), pOrder, orderLen)) { + + IppsGFpState* pGF = ECP_GFP(pEC); + gsModEngine* pGFE = GFP_PMA(pGF); + + int elmLen = GFP_FELEN(pGFE); + int pelmLen = GFP_PELEN(pGFE); + + BNU_CHUNK_T* h1 = cpGFpGetPool(2, pGFE); + BNU_CHUNK_T* h2 = h1+pelmLen; + + IppsGFpECPoint P, G, Public; + + /* Y = 1/signY mod order */ + __ALIGN8 IppsBigNumState Y; + __ALIGN8 IppsBigNumState R; + BNU_CHUNK_T* buffer = ECP_SBUFFER(pEC); + BN_Make(buffer, buffer+orderLen+1, orderLen, &Y); + BN_Make(buffer+(orderLen+1)*2, buffer+(orderLen+1)*3, orderLen, &R); + /* BN(order) */ + BN_Set(pOrder, orderLen, &R); + ippsModInv_BN((IppsBigNumState*)pSignY, &R, &Y); + /* h1 = 1/signY mod order */ + cpGFpElementCopyPadd(h1, orderLen, BN_NUMBER(&Y), BN_SIZE(&Y)); + cpMontEnc_BNU_EX(h1, h1, orderLen, pModEngine); + + /* validate signature */ + cpEcGFpInitPoint(&P, cpEcGFpGetPool(1, pEC),0, pEC); + cpEcGFpInitPoint(&G, ECP_G(pEC), ECP_AFFINE_POINT|ECP_FINITE_POINT, pEC); + cpEcGFpInitPoint(&Public, ECP_PUBLIC(pEC), ECP_FINITE_POINT, pEC); + + /* h2 = pSignX * h1 (mod order) */ + cpMontMul_BNU_EX(h2, + h1,orderLen, BN_NUMBER(pSignX), BN_SIZE(pSignX), + pModEngine); + /* h1 = pMsgDigest * h1 (mod order) */ + cpMontMul_BNU_EX(h1, + h1,orderLen, BN_NUMBER(pMsgDigest), BN_SIZE(pMsgDigest), + pModEngine); + + /* compute h1*BasePoint + h2*publicKey */ + gfec_BasePointProduct(&P, + h1, orderLen, &Public, h2, orderLen, + pEC, (Ipp8u*)ECP_SBUFFER(pEC)); + + /* get P.X */ + if(gfec_GetPoint(h1, NULL, &P, pEC)) { + /* C' = int(P.x) mod order */ + GFP_METHOD(pGFE)->decode(h1, h1, pGFE); + elmLen = cpMod_BNU(h1, elmLen, pOrder, orderLen); + cpGFpElementPadd(h1+elmLen, orderLen-elmLen, 0); + + /* and make sure signX==P.X */ + cpGFpElementCopyPadd(h2, orderLen, BN_NUMBER(pSignX), BN_SIZE(pSignX)); + if(GFP_EQ(h1, h2, orderLen)) + vResult = ippECValid; + } + + cpEcGFpReleasePool(1, pEC); + cpGFpReleasePool(2, pGFE); + } + + *pResult = vResult; + return ippStsNoErr; + } +} |