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| |
| /* |
| // |
| // Purpose: |
| // Cryptography Primitive. |
| // EC over Prime Finite Field (EC Point operations) |
| // |
| // Contents: |
| // ippsECCPGetPoint() |
| // |
| */ |
| |
| #include "owndefs.h" |
| #include "owncp.h" |
| #include "pcpeccp.h" |
| |
| /*F* |
| // Name: ippsECCPGetPoint |
| // |
| // Purpose: Converts internal presentation EC point - montgomery projective |
| // into regular affine coordinates EC point (pX,pY) |
| // |
| // Returns: Reason: |
| // ippStsNullPtrErr NULL == pEC |
| // NULL == pPoint |
| // |
| // ippStsContextMatchErr illegal pEC->idCtx |
| // illegal pPoint->idCtx |
| // NULL != pX, illegal pX->idCtx |
| // NULL != pY, illegal pY->idCtx |
| // |
| // ippStsNoErr no errors |
| // |
| // Parameters: |
| // pX pointer to the regular affine coordinate X |
| // pY pointer to the regular affine coordinate Y |
| // pPoint pointer to the EC Point context |
| // pEC pointer to the ECCP context |
| // |
| *F*/ |
| IPPFUN(IppStatus, ippsECCPGetPoint,(IppsBigNumState* pX, IppsBigNumState* pY, |
| const IppsECCPPointState* pPoint, |
| IppsECCPState* pEC)) |
| { |
| /* test pEC */ |
| IPP_BAD_PTR1_RET(pEC); |
| /* use aligned EC context */ |
| pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) ); |
| IPP_BADARG_RET(!ECP_TEST_ID(pEC), ippStsContextMatchErr); |
| |
| /* test pX and pY */ |
| if(pX) { |
| pX = (IppsBigNumState*)( IPP_ALIGNED_PTR(pX, ALIGN_VAL) ); |
| IPP_BADARG_RET(!BN_VALID_ID(pX), ippStsContextMatchErr); |
| } |
| if(pY) { |
| pY = (IppsBigNumState*)( IPP_ALIGNED_PTR(pY, ALIGN_VAL) ); |
| IPP_BADARG_RET(!BN_VALID_ID(pY), ippStsContextMatchErr); |
| } |
| |
| { |
| IppStatus sts; |
| |
| IppsGFpState* pGF = ECP_GFP(pEC); |
| gsModEngine* pGFE = GFP_PMA(pGF); |
| int elemLen = GFP_FELEN(pGFE); |
| |
| mod_decode decode = GFP_METHOD(pGFE)->decode; /* gf decode method */ |
| |
| IppsGFpElement elmX, elmY; |
| |
| cpGFpElementConstruct(&elmX, cpGFpGetPool(1, pGFE), elemLen); |
| cpGFpElementConstruct(&elmY, cpGFpGetPool(1, pGFE), elemLen); |
| do { |
| sts = ippsGFpECGetPoint(pPoint, pX? &elmX:NULL, pY? &elmY:NULL, pEC); |
| if(ippStsNoErr!=sts) break; |
| |
| if(pX) { |
| decode(elmX.pData, elmX.pData, pGFE); |
| sts = ippsSet_BN(ippBigNumPOS, GFP_FELEN32(pGFE), (Ipp32u*)elmX.pData, pX); |
| if(ippStsNoErr!=sts) break; |
| } |
| if(pY) { |
| decode(elmY.pData, elmY.pData, pGFE); |
| sts = ippsSet_BN(ippBigNumPOS, GFP_FELEN32(pGFE), (Ipp32u*)elmY.pData, pY); |
| if(ippStsNoErr!=sts) break; |
| } |
| } while(0); |
| |
| cpGFpReleasePool(2, pGFE); |
| return sts; |
| } |
| } |