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40
41 /*
42 //
43 // Purpose:
44 // Cryptography Primitive.
45 // EC over Prime Finite Field (setup/retrieve domain parameters)
46 //
47 // Contents:
48 // ECCPSetDP()
49 //
50 */
51
52 #include "owndefs.h"
53 #include "owncp.h"
54 #include "pcpeccp.h"
55
56 /*F*
57 // Name: ippsECCPSet
58 //
59 // Purpose: Set EC Domain Parameters.
60 //
61 // Returns: Reason:
62 // ippStsNullPtrErr NULL == pPrime
63 // NULL == pA
64 // NULL == pB
65 // NULL == pGX
66 // NULL == pGY
67 // NULL == pOrder
68 // NULL == pECC
69 //
70 // ippStsContextMatchErr illegal pPrime->idCtx
71 // illegal pA->idCtx
72 // illegal pB->idCtx
73 // illegal pGX->idCtx
74 // illegal pGY->idCtx
75 // illegal pOrder->idCtx
76 // illegal pECC->idCtx
77 //
78 // ippStsRangeErr not enough room for:
79 // pPrime
80 // pA, pB,
81 // pGX,pGY
82 // pOrder
83 //
84 // ippStsRangeErr 0>= cofactor
85 //
86 // ippStsNoErr no errors
87 //
88 // Parameters:
89 // pPrime pointer to the prime (specify FG(p))
90 // pA pointer to the A coefficient of EC equation
91 // pB pointer to the B coefficient of EC equation
92 // pGX,pGY pointer to the Base Point (x and y coordinates) of EC
93 // pOrder pointer to the Base Point order
94 // cofactor cofactor value
95 // pECC pointer to the ECC context
96 //
97 *F*/
ECCPSetDP(const IppsGFpMethod * method,int pLen,const BNU_CHUNK_T * pP,int aLen,const BNU_CHUNK_T * pA,int bLen,const BNU_CHUNK_T * pB,int xLen,const BNU_CHUNK_T * pX,int yLen,const BNU_CHUNK_T * pY,int rLen,const BNU_CHUNK_T * pR,BNU_CHUNK_T h,IppsGFpECState * pEC)98 IppStatus ECCPSetDP(const IppsGFpMethod* method,
99 int pLen, const BNU_CHUNK_T* pP,
100 int aLen, const BNU_CHUNK_T* pA,
101 int bLen, const BNU_CHUNK_T* pB,
102 int xLen, const BNU_CHUNK_T* pX,
103 int yLen, const BNU_CHUNK_T* pY,
104 int rLen, const BNU_CHUNK_T* pR,
105 BNU_CHUNK_T h,
106 IppsGFpECState* pEC)
107 {
108 IPP_BADARG_RET(!ECP_TEST_ID(pEC), ippStsContextMatchErr);
109
110 {
111 IppsGFpState * pGF = ECP_GFP(pEC);
112
113 IppStatus sts = ippStsNoErr;
114 IppsBigNumState P, H;
115 int primeBitSize = BITSIZE_BNU(pP, pLen);
116 //cpConstructBN(&P, pLen, (BNU_CHUNK_T*)pP, NULL);
117 //sts = cpGFpSetGFp(&P, primeBitSize, method, pGF);
118 cpGFpSetGFp(pP, primeBitSize, method, pGF);
119
120 if(ippStsNoErr==sts) {
121 gsModEngine* pGFE = GFP_PMA(pGF);
122
123 do {
124 int elemLen = GFP_FELEN(pGFE);
125 IppsGFpElement elmA, elmB;
126
127 /* convert A ans B coeffs into GF elements */
128 cpGFpElementConstruct(&elmA, cpGFpGetPool(1, pGFE), elemLen);
129 cpGFpElementConstruct(&elmB, cpGFpGetPool(1, pGFE), elemLen);
130 sts = ippsGFpSetElement((Ipp32u*)pA, BITS2WORD32_SIZE(BITSIZE_BNU(pA,aLen)), &elmA, pGF);
131 if(ippStsNoErr!=sts) break;
132 sts = ippsGFpSetElement((Ipp32u*)pB, BITS2WORD32_SIZE(BITSIZE_BNU(pB,bLen)), &elmB, pGF);
133 if(ippStsNoErr!=sts) break;
134 /* and set EC */
135 sts = ippsGFpECSet(&elmA, &elmB, pEC);
136 if(ippStsNoErr!=sts) break;
137
138 /* convert GX ans GY coeffs into GF elements */
139 cpConstructBN(&P, rLen, (BNU_CHUNK_T*)pR, NULL);
140 cpConstructBN(&H, 1, &h, NULL);
141 sts = ippsGFpSetElement((Ipp32u*)pX, BITS2WORD32_SIZE(BITSIZE_BNU(pX,xLen)), &elmA, pGF);
142 if(ippStsNoErr!=sts) break;
143 sts = ippsGFpSetElement((Ipp32u*)pY, BITS2WORD32_SIZE(BITSIZE_BNU(pY,yLen)), &elmB, pGF);
144 if(ippStsNoErr!=sts) break;
145 /* and init EC subgroup */
146 sts = ippsGFpECSetSubgroup(&elmA, &elmB, &P, &H, pEC);
147 } while(0);
148
149 cpGFpReleasePool(2, pGFE);
150 }
151
152 return sts;
153 }
154 }
155