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40
41 /*
42 //
43 // Purpose:
44 // Intel(R) Integrated Performance Primitives. Cryptography Primitives.
45 // Internal EC over GF(p^m) basic Definitions & Function Prototypes
46 //
47 // Context:
48 // gfec_MulPoint()
49 //
50 */
51
52 #include "owndefs.h"
53 #include "owncp.h"
54 #include "pcpgfpecstuff.h"
55 #include "gsscramble.h"
56
gfec_MulPoint(IppsGFpECPoint * pR,const IppsGFpECPoint * pP,const BNU_CHUNK_T * pScalar,int scalarLen,IppsGFpECState * pEC,Ipp8u * pScratchBuffer)57 IppsGFpECPoint* gfec_MulPoint(IppsGFpECPoint* pR,
58 const IppsGFpECPoint* pP,
59 const BNU_CHUNK_T* pScalar, int scalarLen,
60 IppsGFpECState* pEC, Ipp8u* pScratchBuffer)
61 {
62 FIX_BNU(pScalar, scalarLen);
63 {
64 gsModEngine* pGForder = ECP_MONT_R(pEC);
65
66 BNU_CHUNK_T* pTmpScalar = cpGFpGetPool(1, pGForder); /* length of scalar does not exceed length of order */
67 int orderBits = MOD_BITSIZE(pGForder);
68 int orderLen = MOD_LEN(pGForder);
69 cpGFpElementCopyPadd(pTmpScalar,orderLen+1, pScalar,scalarLen);
70
71 gfec_point_mul(ECP_POINT_X(pR), ECP_POINT_X(pP),
72 (Ipp8u*)pTmpScalar, orderBits,
73 pEC, pScratchBuffer);
74 cpGFpReleasePool(1, pGForder);
75
76 ECP_POINT_FLAGS(pR) = gfec_IsPointAtInfinity(pR)? 0 : ECP_FINITE_POINT;
77 return pR;
78 }
79 }