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40
41 /*
42 // Intel(R) Integrated Performance Primitives. Cryptography Primitives.
43 // Operations over GF(p).
44 //
45 // Context:
46 // cpGFpSetGFp()
47 //
48 //
49 */
50 #include "owndefs.h"
51 #include "owncp.h"
52
53 #include "pcpgfpstuff.h"
54 #include "pcpgfpxstuff.h"
55 #include "pcptool.h"
56
57
cpGFESet(gsModEngine * pGFE,const BNU_CHUNK_T * pPrime,int primeBitSize,const gsModMethod * method)58 static void cpGFESet(gsModEngine* pGFE, const BNU_CHUNK_T* pPrime, int primeBitSize, const gsModMethod* method)
59 {
60 int primeLen = BITS_BNU_CHUNK(primeBitSize);
61
62 /* arithmetic methods */
63 GFP_METHOD(pGFE) = method;
64
65 /* store modulus */
66 COPY_BNU(GFP_MODULUS(pGFE), pPrime, primeLen);
67
68 /* montgomery factor */
69 GFP_MNT_FACTOR(pGFE) = gsMontFactor(GFP_MODULUS(pGFE)[0]);
70
71 /* montgomery identity (R) */
72 ZEXPAND_BNU(GFP_MNT_R(pGFE), 0, primeLen);
73 GFP_MNT_R(pGFE)[primeLen] = 1;
74 cpMod_BNU(GFP_MNT_R(pGFE), primeLen+1, GFP_MODULUS(pGFE), primeLen);
75
76 /* montgomery domain converter (RR) */
77 ZEXPAND_BNU(GFP_MNT_RR(pGFE), 0, primeLen);
78 COPY_BNU(GFP_MNT_RR(pGFE)+primeLen, GFP_MNT_R(pGFE), primeLen);
79 cpMod_BNU(GFP_MNT_RR(pGFE), 2*primeLen, GFP_MODULUS(pGFE), primeLen);
80
81 /* half of modulus */
82 cpLSR_BNU(GFP_HMODULUS(pGFE), GFP_MODULUS(pGFE), primeLen, 1);
83
84 /* set qnr value */
85 cpGFEqnr(pGFE);
86 }
87
cpGFpSetGFp(const BNU_CHUNK_T * pPrime,int primeBitSize,const IppsGFpMethod * method,IppsGFpState * pGF)88 IppStatus cpGFpSetGFp(const BNU_CHUNK_T* pPrime, int primeBitSize, const IppsGFpMethod* method, IppsGFpState* pGF)
89 {
90 cpGFESet(GFP_PMA(pGF), pPrime, primeBitSize, method->arith);
91 return ippStsNoErr;
92 }
93