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/*############################################################################
# Copyright 1999-2018 Intel Corporation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# 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.
// DSA signature generation and verification
//
// Contents:
// ippsGFpECSignDSA()
// ippsGFpECVerifyDSA()
//
*/
#include "owndefs.h"
#include "owncp.h"
#include "pcpeccp.h"
/*F*
// Name: ippsGFpECSignDSA
//
// Purpose: DSA Signature Generation.
//
// Returns: Reason:
// ippStsNullPtrErr NULL == pEC
// NULL == pMsg
// NULL == pRegPrivate
// NULL == pEphPrivate
// NULL == pSignC
// NULL == pSignD
// NULL == pScratchBuffer
//
// ippStsContextMatchErr illegal pEC->idCtx
// illegal pMsg->idCtx
// illegal pRegPrivate->idCtx
// illegal pEphPrivate->idCtx
// illegal pSignC->idCtx
// illegal pSignD->idCtx
//
// ippStsMessageErr Msg < 0
//
// ippStsRangeErr not enough room for:
// signC
// signD
//
// ippStsErr (0==signC) || (0==signD)
//
// ippStsNoErr no errors
//
// Parameters:
// pMsg pointer to the message representative to be signed
// pRegPrivate pointer to the regular private key
// pEphPrivate pointer to the ephemeral private key
// pSignR,pSignS pointer to the signature
// pEC pointer to the EC context
// pScratchBuffer pointer to buffer (1 mul_point operation)
//
*F*/
IPPFUN(IppStatus, ippsGFpECSignDSA,(const IppsBigNumState* pMsg,
const IppsBigNumState* pRegPrivate,
const IppsBigNumState* pEphPrivate,
IppsBigNumState* pSignC, IppsBigNumState* pSignD,
IppsGFpECState* pEC,
Ipp8u* pScratchBuffer))
{
IppsGFpState* pGF;
gsModEngine* pGFE;
/* EC context and buffer */
IPP_BAD_PTR2_RET(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(1<GFP_EXTDEGREE(pGFE), ippStsNotSupportedModeErr);
/* test message representative */
IPP_BAD_PTR1_RET(pMsg);
pMsg = (IppsBigNumState*)( IPP_ALIGNED_PTR(pMsg, ALIGN_VAL) );
IPP_BADARG_RET(!BN_VALID_ID(pMsg), ippStsContextMatchErr);
IPP_BADARG_RET(BN_NEGATIVE(pMsg), ippStsMessageErr);
/* test signature */
IPP_BAD_PTR2_RET(pSignC, pSignD);
pSignC = (IppsBigNumState*)( IPP_ALIGNED_PTR(pSignC, BN_ALIGNMENT) );
pSignD = (IppsBigNumState*)( IPP_ALIGNED_PTR(pSignD, BN_ALIGNMENT) );
IPP_BADARG_RET(!BN_VALID_ID(pSignC), ippStsContextMatchErr);
IPP_BADARG_RET(!BN_VALID_ID(pSignD), ippStsContextMatchErr);
IPP_BADARG_RET((BN_ROOM(pSignC)*BITSIZE(BNU_CHUNK_T)<ECP_ORDBITSIZE(pEC)), ippStsRangeErr);
IPP_BADARG_RET((BN_ROOM(pSignD)*BITSIZE(BNU_CHUNK_T)<ECP_ORDBITSIZE(pEC)), ippStsRangeErr);
/* test private keys */
IPP_BAD_PTR2_RET(pRegPrivate, pEphPrivate);
pRegPrivate = (IppsBigNumState*)( IPP_ALIGNED_PTR(pRegPrivate, ALIGN_VAL) );
IPP_BADARG_RET(!BN_VALID_ID(pRegPrivate), ippStsContextMatchErr);
pEphPrivate = (IppsBigNumState*)( IPP_ALIGNED_PTR(pEphPrivate, ALIGN_VAL) );
IPP_BADARG_RET(!BN_VALID_ID(pEphPrivate), ippStsContextMatchErr);
{
gsModEngine* pMontR = ECP_MONT_R(pEC);
BNU_CHUNK_T* pOrder = MOD_MODULUS(pMontR);
int orderLen = MOD_LEN(pMontR);
BNU_CHUNK_T* dataC = BN_NUMBER(pSignC);
BNU_CHUNK_T* dataD = BN_NUMBER(pSignD);
BNU_CHUNK_T* buffD = BN_BUFFER(pSignD);
BNU_CHUNK_T* buffMsg = BN_BUFFER(pMsg);
/* test value of private keys: regPrivate<order, ephPrivate<order */
IPP_BADARG_RET(BN_NEGATIVE(pRegPrivate) ||
(0<=cpCmp_BNU(BN_NUMBER(pRegPrivate), BN_SIZE(pRegPrivate), pOrder, orderLen)), ippStsIvalidPrivateKey);
IPP_BADARG_RET(BN_NEGATIVE(pEphPrivate) ||
(0<=cpCmp_BNU(BN_NUMBER(pEphPrivate), BN_SIZE(pEphPrivate), pOrder, orderLen)), ippStsIvalidPrivateKey);
{
int elmLen = GFP_FELEN(pGFE);
int ns;
/* compute ephemeral public key */
IppsGFpECPoint ephPublic;
cpEcGFpInitPoint(&ephPublic, cpEcGFpGetPool(1, pEC), 0, pEC);
gfec_MulBasePoint(&ephPublic,
BN_NUMBER(pEphPrivate), BN_SIZE(pEphPrivate),
pEC, pScratchBuffer);
/* C = (ephPublic.x) mod order */
gfec_GetPoint(dataC, NULL, &ephPublic, pEC);
GFP_METHOD(pGFE)->decode(dataC, dataC, pGFE);
ns = cpMod_BNU(dataC, elmLen, pOrder, orderLen);
cpGFpElementPadd(dataC+ns, orderLen-ns, 0);
cpEcGFpReleasePool(1, pEC);
/* check c!=0 */
if(GFP_IS_ZERO(dataC, orderLen)) return ippStsErr;
/* reduce message: msg = msg mod ordfer */
COPY_BNU(buffMsg, BN_NUMBER(pMsg), BN_SIZE(pMsg));
ns = cpMod_BNU(buffMsg, BN_SIZE(pMsg), pOrder, orderLen);
ZEXPAND_BNU(buffMsg+ns, orderLen-ns, 0);
/* D = (ephPrivate^-1) * (msg + regPrivate*C) mod order */
ZEXPAND_COPY_BNU(buffD, orderLen, BN_NUMBER(pRegPrivate),BN_SIZE(pRegPrivate));
cpMontEnc_BNU_EX(buffD, buffD, orderLen, pMontR);
cpMontMul_BNU(buffD, buffD, dataC, pMontR);
cpModAdd_BNU(buffD, buffD, buffMsg, pOrder, orderLen, dataD);
ZEXPAND_COPY_BNU(dataD, orderLen, BN_NUMBER(pEphPrivate),BN_SIZE(pEphPrivate));
//cpMontInv_BNU(dataD, dataD, pMontR); /* d = ephPrivate^-1 */
gs_mont_inv(dataD, dataD, pMontR); /* d = ephPrivate^-1 */
cpMontMul_BNU(dataD, dataD, buffD, pMontR);
/* check d!=0 */
if(GFP_IS_ZERO(dataD, orderLen)) return ippStsErr;
/* signC */
ns = orderLen;
FIX_BNU(dataC, ns);
BN_SIGN(pSignC) = ippBigNumPOS;
BN_SIZE(pSignC) = ns;
/* signD */
ns = orderLen;
FIX_BNU(dataD, ns);
BN_SIGN(pSignD) = ippBigNumPOS;
BN_SIZE(pSignD) = ns;
return ippStsNoErr;
}
}
}
/*F*
// Name: ippsGFpECVerifyDSA
//
// Purpose: DSA Signature Verification.
//
// Returns: Reason:
// ippStsNullPtrErr NULL == pEC
// NULL == pMsg
// NULL == pRegPublic
// NULL == pSignC
// NULL == pSignD
// NULL == pResult
// NULL == pScratchBuffer
//
// ippStsContextMatchErr illegal pECC->idCtx
// illegal pMsgDigest->idCtx
// illegal pRegPublic->idCtx
// illegal pSignC->idCtx
// illegal pSignD->idCtx
//
// ippStsMessageErr Msg < 0
// ippStsRangeErr SignC < 0 or SignD < 0
//
// ippStsOutOfRangeErr bitsize(pRegPublic) != bitsize(prime)
//
// ippStsNoErr no errors
//
// Parameters:
// pMsg pointer to the message representative to being signed
// pRegPublic pointer to the regular public key
// pSignC,pSignD pointer to the signature
// pResult pointer to the result: ippECValid/ippECInvalidSignature
// pEC pointer to the ECCP context
// pScratchBuffer pointer to buffer (2 mul_point operation)
//
*F*/
IPPFUN(IppStatus, ippsGFpECVerifyDSA,(const IppsBigNumState* pMsg,
const IppsGFpECPoint* pRegPublic,
const IppsBigNumState* pSignC, const IppsBigNumState* pSignD,
IppECResult* pResult,
IppsGFpECState* pEC,
Ipp8u* pScratchBuffer))
{
IppsGFpState* pGF;
gsModEngine* pGFE;
/* EC context and buffer */
IPP_BAD_PTR2_RET(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(1<GFP_EXTDEGREE(pGFE), ippStsNotSupportedModeErr);
/* test message representative */
IPP_BAD_PTR1_RET(pMsg);
pMsg = (IppsBigNumState*)( IPP_ALIGNED_PTR(pMsg, ALIGN_VAL) );
IPP_BADARG_RET(!BN_VALID_ID(pMsg), ippStsContextMatchErr);
IPP_BADARG_RET(BN_NEGATIVE(pMsg), ippStsMessageErr);
/* test regular public key */
IPP_BAD_PTR1_RET(pRegPublic);
IPP_BADARG_RET( !ECP_POINT_TEST_ID(pRegPublic), ippStsContextMatchErr );
IPP_BADARG_RET( ECP_POINT_FELEN(pRegPublic)!=GFP_FELEN(pGFE), ippStsOutOfRangeErr);
/* test signature */
IPP_BAD_PTR2_RET(pSignC, pSignD);
pSignC = (IppsBigNumState*)( IPP_ALIGNED_PTR(pSignC, ALIGN_VAL) );
pSignD = (IppsBigNumState*)( IPP_ALIGNED_PTR(pSignD, ALIGN_VAL) );
IPP_BADARG_RET(!BN_VALID_ID(pSignC), ippStsContextMatchErr);
IPP_BADARG_RET(!BN_VALID_ID(pSignD), ippStsContextMatchErr);
IPP_BADARG_RET(BN_NEGATIVE(pSignC), ippStsRangeErr);
IPP_BADARG_RET(BN_NEGATIVE(pSignD), ippStsRangeErr);
/* test result */
IPP_BAD_PTR1_RET(pResult);
{
IppECResult vResult = ippECInvalidSignature;
gsModEngine* pMontR = ECP_MONT_R(pEC);
BNU_CHUNK_T* pOrder = MOD_MODULUS(pMontR);
int orderLen = MOD_LEN(pMontR);
/* test signature value */
if(!cpEqu_BNU_CHUNK(BN_NUMBER(pSignC), BN_SIZE(pSignC), 0) &&
!cpEqu_BNU_CHUNK(BN_NUMBER(pSignD), BN_SIZE(pSignD), 0) &&
0>cpCmp_BNU(BN_NUMBER(pSignC), BN_SIZE(pSignC), pOrder, orderLen) &&
0>cpCmp_BNU(BN_NUMBER(pSignD), BN_SIZE(pSignD), pOrder, orderLen)) {
int elmLen = GFP_FELEN(pGFE);
int pelmLen = GFP_PELEN(pGFE);
int ns;
BNU_CHUNK_T* h1 = cpGFpGetPool(3, pGFE);
BNU_CHUNK_T* h2 = h1+pelmLen;
BNU_CHUNK_T* h = h2+pelmLen;
BNU_CHUNK_T* buffMsg = BN_BUFFER(pMsg);
IppsGFpECPoint P;
cpEcGFpInitPoint(&P, cpEcGFpGetPool(1, pEC),0, pEC);
/* reduce message: h1 = msg mod ordfer */
COPY_BNU(buffMsg, BN_NUMBER(pMsg), BN_SIZE(pMsg));
ns = cpMod_BNU(buffMsg, BN_SIZE(pMsg), pOrder, orderLen);
ZEXPAND_COPY_BNU(h1, orderLen, buffMsg, ns);
/* h = d^-1, h1 = msg*h, h2 = c*h */
ZEXPAND_COPY_BNU(h, orderLen, BN_NUMBER(pSignD),BN_SIZE(pSignD));
//cpMontInv_BNU(h, h, pMontR);
gs_mont_inv(h, h, pMontR);
cpMontMul_BNU(h1, h, h1, pMontR);
ZEXPAND_COPY_BNU(h2, orderLen, BN_NUMBER(pSignC),BN_SIZE(pSignC));
cpMontMul_BNU(h2, h, h2, pMontR);
/* P = [h1]BasePoint + [h2]publicKey */
gfec_BasePointProduct(&P,
h1, orderLen, pRegPublic, h2, orderLen,
pEC, pScratchBuffer);
/* 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 c' = signC */
cpGFpElementCopyPadd(h2, orderLen, BN_NUMBER(pSignC), BN_SIZE(pSignC));
if(GFP_EQ(h1, h2, orderLen))
vResult = ippECValid;
}
cpEcGFpReleasePool(1, pEC);
cpGFpReleasePool(3, pGFE);
}
*pResult = vResult;
return ippStsNoErr;
}
}
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