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| |
| /* |
| // Intel(R) Integrated Performance Primitives. Cryptography Primitives. |
| // |
| // Context: |
| // ippsGFpECSignNR() |
| // |
| */ |
| |
| #include "owndefs.h" |
| #include "owncp.h" |
| #include "pcpeccp.h" |
| |
| /*F* |
| // Name: ippsGFpECSignNR |
| // |
| // Purpose: NR Signature Generation. |
| // |
| // Returns: Reason: |
| // ippStsNullPtrErr NULL == pEC |
| // NULL == pMsgDigest |
| // NULL == pRegPrivate |
| // NULL == pEphPrivate |
| // NULL == pSignR |
| // NULL == pSignS |
| // NULL == pScratchBuffer |
| // |
| // ippStsContextMatchErr illegal pEC->idCtx |
| // pEC->subgroup == NULL |
| // illegal pMsgDigest->idCtx |
| // illegal pRegPrivate->idCtx |
| // illegal pEphPrivate->idCtx |
| // illegal pSignR->idCtx |
| // illegal pSignS->idCtx |
| // |
| // ippStsIvalidPrivateKey 0 >= RegPrivate |
| // RegPrivate >= order |
| // |
| // 0 >= EphPrivate |
| // EphPrivate >= order |
| // |
| // ippStsMessageErr pMsgDigest < 0 |
| // pMsgDigest >= order |
| // |
| // ippStsRangeErr not enough room for: |
| // signC |
| // signD |
| // |
| // ippStsEphemeralKeyErr (0==signR) || (0==signS) |
| // |
| // ippStsNotSupportedModeErr 1<GFP_EXTDEGREE(pGFE) |
| // |
| // ippStsNoErr no errors |
| // |
| // Parameters: |
| // pMsgDigest 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, ippsGFpECSignNR,(const IppsBigNumState* pMsgDigest, |
| const IppsBigNumState* pRegPrivate, |
| const IppsBigNumState* pEphPrivate, |
| IppsBigNumState* pSignR, IppsBigNumState* pSignS, |
| IppsGFpECState* pEC, |
| Ipp8u* pScratchBuffer)) |
| { |
| IppsGFpState* pGF; |
| gsModEngine* pMontP; |
| |
| /* 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); |
| IPP_BADARG_RET(!ECP_SUBGROUP(pEC), ippStsContextMatchErr); |
| |
| pGF = ECP_GFP(pEC); |
| pMontP = GFP_PMA(pGF); |
| IPP_BADARG_RET(1<GFP_EXTDEGREE(pMontP), ippStsNotSupportedModeErr); |
| |
| /* 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 signature */ |
| IPP_BAD_PTR2_RET(pSignR, pSignS); |
| pSignR = (IppsBigNumState*)( IPP_ALIGNED_PTR(pSignR, BN_ALIGNMENT) ); |
| pSignS = (IppsBigNumState*)( IPP_ALIGNED_PTR(pSignS, BN_ALIGNMENT) ); |
| IPP_BADARG_RET(!BN_VALID_ID(pSignR), ippStsContextMatchErr); |
| IPP_BADARG_RET(!BN_VALID_ID(pSignS), ippStsContextMatchErr); |
| IPP_BADARG_RET((BN_ROOM(pSignR)*BITSIZE(BNU_CHUNK_T)<ECP_ORDBITSIZE(pEC)), ippStsRangeErr); |
| IPP_BADARG_RET((BN_ROOM(pSignS)*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); |
| IPP_BADARG_RET(BN_NEGATIVE(pRegPrivate), ippStsIvalidPrivateKey); |
| |
| pEphPrivate = (IppsBigNumState*)( IPP_ALIGNED_PTR(pEphPrivate, ALIGN_VAL) ); |
| IPP_BADARG_RET(!BN_VALID_ID(pEphPrivate), ippStsContextMatchErr); |
| IPP_BADARG_RET(BN_NEGATIVE(pEphPrivate), ippStsEphemeralKeyErr); |
| |
| { |
| gsModEngine* pMontR = ECP_MONT_R(pEC); |
| BNU_CHUNK_T* pOrder = MOD_MODULUS(pMontR); |
| int ordLen = MOD_LEN(pMontR); |
| |
| BNU_CHUNK_T* dataC = BN_NUMBER(pSignR); |
| BNU_CHUNK_T* dataD = BN_NUMBER(pSignS); |
| BNU_CHUNK_T* buffF = BN_BUFFER(pSignR); |
| BNU_CHUNK_T* buffT = BN_BUFFER(pSignS); |
| |
| BNU_CHUNK_T* pPriData = BN_NUMBER(pRegPrivate); |
| int priLen = BN_SIZE(pRegPrivate); |
| |
| BNU_CHUNK_T* pEphData = BN_NUMBER(pEphPrivate); |
| int ephLen = BN_SIZE(pEphPrivate); |
| |
| BNU_CHUNK_T* pMsgData = BN_NUMBER(pMsgDigest); |
| int msgLen = BN_SIZE(pMsgDigest); |
| |
| /* test value of private keys: 0 < regPrivate<order, 0 < ephPrivate < order */ |
| IPP_BADARG_RET(cpEqu_BNU_CHUNK(pPriData, priLen, 0) || |
| 0<=cpCmp_BNU(pPriData, priLen, pOrder, ordLen), ippStsIvalidPrivateKey); |
| IPP_BADARG_RET(cpEqu_BNU_CHUNK(pEphData, ephLen, 0) || |
| 0<=cpCmp_BNU(pEphData, ephLen, pOrder, ordLen), ippStsEphemeralKeyErr); |
| |
| /* test mesage: msg < order */ |
| IPP_BADARG_RET(0<=cpCmp_BNU(pMsgData, msgLen, pOrder, ordLen), ippStsMessageErr); |
| |
| { |
| int elmLen = GFP_FELEN(pMontP); |
| 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); |
| |
| /* x = (ephPublic.x) mod order */ |
| { |
| BNU_CHUNK_T* buffer = gsModPoolAlloc(pMontP, 1); |
| gfec_GetPoint(buffer, NULL, &ephPublic, pEC); |
| GFP_METHOD(pMontP)->decode(buffer, buffer, pMontP); |
| ns = cpMod_BNU(buffer, elmLen, pOrder, ordLen); |
| cpGFpElementCopyPadd(dataC, ordLen, buffer, ns); |
| gsModPoolFree(pMontP, 1); |
| } |
| cpEcGFpReleasePool(1, pEC); |
| |
| /* C = (ephPublic.x + msg) mod order */ |
| ZEXPAND_COPY_BNU(buffF, ordLen, pMsgData, msgLen); |
| cpModAdd_BNU(dataC, dataC, buffF, pOrder, ordLen, dataD); |
| |
| if(!GFP_IS_ZERO(dataC, ordLen)) { |
| |
| /* signS = (eph_private - private*signR) (mod order) */ |
| ZEXPAND_COPY_BNU(dataD, ordLen, pPriData, priLen); |
| GFP_METHOD(pMontR)->encode(dataD, dataD, pMontR); |
| GFP_METHOD(pMontR)->mul(dataD, dataD, dataC, pMontR); |
| ZEXPAND_COPY_BNU(buffF, ordLen, pEphData, ephLen); |
| cpModSub_BNU(dataD, buffF, dataD, pOrder, ordLen, buffT); |
| |
| /* signR */ |
| ns = ordLen; |
| FIX_BNU(dataC, ns); |
| BN_SIGN(pSignR) = ippBigNumPOS; |
| BN_SIZE(pSignR) = ns; |
| /* signS */ |
| ns = ordLen; |
| FIX_BNU(dataD, ns); |
| BN_SIGN(pSignS) = ippBigNumPOS; |
| BN_SIZE(pSignS) = ns; |
| |
| return ippStsNoErr; |
| } |
| |
| return ippStsEphemeralKeyErr; |
| } |
| } |
| } |
