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/*
//
// Purpose:
// Cryptography Primitive.
// EC over Prime Finite Field (Verify Signature, SM2 version)
//
// Contents:
// ippsECCPVerifySM2()
//
//
*/
#include "owndefs.h"
#include "owncp.h"
#include "pcpeccp.h"
/*F*
// Name: ippsECCPVerifySM2
//
// Purpose: Verify Signature (SM2 version).
//
// Returns: Reason:
// ippStsNullPtrErr NULL == pEC
// NULL == pMsgDigest
// NULL == pRegPublic
// NULL == pSignR
// NULL == pSignS
// NULL == pResult
//
// ippStsContextMatchErr illegal pEC->idCtx
// illegal pMsgDigest->idCtx
// illegal pRegPublic->idCtx
// illegal pSignR->idCtx
// illegal pSignS->idCtx
//
// ippStsMessageErr 0> MsgDigest
// order<= MsgDigest
//
// ippStsRangeErr SignR < 0 or SignS < 0
//
// ippStsNoErr no errors
//
// Parameters:
// pMsgDigest pointer to the message representative to being signed
// pRegPublic pointer to the regular public key
// pSignR,pSignS pointer to the signature
// pResult pointer to the result: ippECValid/ippECInvalidSignature
// pEC pointer to the ECCP context
//
*F*/
IPPFUN(IppStatus, ippsECCPVerifySM2,(const IppsBigNumState* pMsgDigest,
const IppsECCPPointState* pRegPublic,
const IppsBigNumState* pSignR, const IppsBigNumState* pSignS,
IppECResult* pResult,
IppsECCPState* pEC))
{
IppsGFpState* pGF;
gsModEngine* pGFE;
/* 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);
pGF = ECP_GFP(pEC);
pGFE = GFP_PMA(pGF);
/* test message representative */
IPP_BAD_PTR1_RET(pMsgDigest);
pMsgDigest = (IppsBigNumState*)( IPP_ALIGNED_PTR(pMsgDigest, ALIGN_VAL) );
IPP_BADARG_RET(!BN_VALID_ID(pMsgDigest), ippStsContextMatchErr);
IPP_BADARG_RET(BN_NEGATIVE(pMsgDigest), 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 result */
IPP_BAD_PTR1_RET(pResult);
/* test signature */
IPP_BAD_PTR2_RET(pSignR, pSignS);
pSignR = (IppsBigNumState*)( IPP_ALIGNED_PTR(pSignR, ALIGN_VAL) );
pSignS = (IppsBigNumState*)( IPP_ALIGNED_PTR(pSignS, ALIGN_VAL) );
IPP_BADARG_RET(!BN_VALID_ID(pSignR), ippStsContextMatchErr);
IPP_BADARG_RET(!BN_VALID_ID(pSignS), ippStsContextMatchErr);
IPP_BADARG_RET(BN_NEGATIVE(pSignR), ippStsRangeErr);
IPP_BADARG_RET(BN_NEGATIVE(pSignS), ippStsRangeErr);
{
IppECResult vResult = ippECInvalidSignature;
gsModEngine* pMontR = ECP_MONT_R(pEC);
BNU_CHUNK_T* pOrder = MOD_MODULUS(pMontR);
int orderLen = MOD_LEN(pMontR);
BNU_CHUNK_T* pMsgData = BN_NUMBER(pMsgDigest);
int msgLen = BN_SIZE(pMsgDigest);
/* test message value */
IPP_BADARG_RET(0<=cpCmp_BNU(pMsgData, msgLen, pOrder, orderLen), ippStsMessageErr);
/* test signature value */
if(!cpEqu_BNU_CHUNK(BN_NUMBER(pSignR), BN_SIZE(pSignR), 0) &&
!cpEqu_BNU_CHUNK(BN_NUMBER(pSignS), BN_SIZE(pSignS), 0) &&
0>cpCmp_BNU(BN_NUMBER(pSignR), BN_SIZE(pSignR), pOrder, orderLen) &&
0>cpCmp_BNU(BN_NUMBER(pSignS), BN_SIZE(pSignS), pOrder, orderLen)) {
int elmLen = GFP_FELEN(pGFE);
int ns;
BNU_CHUNK_T* r = cpGFpGetPool(4, pGFE);
BNU_CHUNK_T* s = r+orderLen;
BNU_CHUNK_T* t = s+orderLen;
BNU_CHUNK_T* f = t+orderLen;
/* expand signatire's components */
cpGFpElementCopyPadd(r, orderLen, BN_NUMBER(pSignR), BN_SIZE(pSignR));
cpGFpElementCopyPadd(s, orderLen, BN_NUMBER(pSignS), BN_SIZE(pSignS));
/* t = (r+s) mod order */
cpModAdd_BNU(t, r, s, pOrder, orderLen, f);
/* P = [s]G +[t]regPublic, t = P.x */
{
IppsGFpECPoint P, G;
cpEcGFpInitPoint(&P, cpEcGFpGetPool(1, pEC),0, pEC);
cpEcGFpInitPoint(&G, ECP_G(pEC), ECP_AFFINE_POINT|ECP_FINITE_POINT, pEC);
gfec_BasePointProduct(&P,
s, orderLen, pRegPublic, t, orderLen,
pEC, (Ipp8u*)ECP_SBUFFER(pEC));
gfec_GetPoint(t, NULL, &P, pEC);
GFP_METHOD(pGFE)->decode(t, t, pGFE);
ns = cpMod_BNU(t, elmLen, pOrder, orderLen);
cpEcGFpReleasePool(1, pEC);
}
/* t = (msg+t) mod order */
cpGFpElementCopyPadd(f, orderLen, pMsgData, msgLen);
cpModAdd_BNU(t, t, f, pOrder, orderLen, f);
if(GFP_EQ(t, r, orderLen))
vResult = ippECValid;
cpGFpReleasePool(4, pGFE);
}
*pResult = vResult;
return ippStsNoErr;
}
}