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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_GetPoint()
49 //
50 */
51
52 #include "owndefs.h"
53 #include "owncp.h"
54 #include "pcpgfpecstuff.h"
55 #include "gsscramble.h"
56
57
58 #if ( ECP_PROJECTIVE_COORD == JACOBIAN )
59 /* returns 1/0 if point is finite/infinite */
gfec_GetPoint(BNU_CHUNK_T * pX,BNU_CHUNK_T * pY,const IppsGFpECPoint * pPoint,IppsGFpECState * pEC)60 int gfec_GetPoint(BNU_CHUNK_T* pX, BNU_CHUNK_T* pY, const IppsGFpECPoint* pPoint, IppsGFpECState* pEC)
61 {
62 IppsGFpState* pGF = ECP_GFP(pEC);
63 gsModEngine* pGFE = GFP_PMA(pGF);
64 int elemLen = GFP_FELEN(pGFE);
65
66 if( !IS_ECP_FINITE_POINT(pPoint) ) {
67 if(pX) cpGFpElementPadd(pX, elemLen, 0);
68 if(pY) cpGFpElementPadd(pY, elemLen, 0);
69 return 0;
70 }
71
72 /* affine point (1==Z) */
73 if( IS_ECP_AFFINE_POINT(pPoint) ) {
74 if(pX)
75 cpGFpElementCopy(pX, ECP_POINT_X(pPoint), elemLen);
76 if(pY)
77 cpGFpElementCopy(pY, ECP_POINT_Y(pPoint), elemLen);
78 return 1;
79 }
80
81 /* projective point (1!=Z) */
82 {
83 mod_mul mulF = GFP_METHOD(pGFE)->mul;
84 mod_sqr sqrF = GFP_METHOD(pGFE)->sqr;
85
86 /* T = (1/Z)*(1/Z) */
87 BNU_CHUNK_T* pT = cpGFpGetPool(1, pGFE);
88 BNU_CHUNK_T* pZinv = cpGFpGetPool(1, pGFE);
89 BNU_CHUNK_T* pU = cpGFpGetPool(1, pGFE);
90 cpGFpxInv(pZinv, ECP_POINT_Z(pPoint), pGFE);
91 sqrF(pT, pZinv, pGFE);
92
93 if(pX) {
94 mulF(pU, ECP_POINT_X(pPoint), pT, pGFE);
95 cpGFpElementCopy(pX, pU, elemLen);
96 }
97 if(pY) {
98 mulF(pT, pZinv, pT, pGFE);
99 mulF(pU, ECP_POINT_Y(pPoint), pT, pGFE);
100 cpGFpElementCopy(pY, pU, elemLen);
101 }
102
103 cpGFpReleasePool(3, pGFE);
104 return 1;
105 }
106 }
107 #endif
108