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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 #include "pcpmask_ct.h"
57
58
gfec_point_mul(BNU_CHUNK_T * pRdata,const BNU_CHUNK_T * pPdata,const Ipp8u * pScalar8,int scalarBitSize,IppsGFpECState * pEC,Ipp8u * pScratchBuffer)59 void gfec_point_mul(BNU_CHUNK_T* pRdata,
60 const BNU_CHUNK_T* pPdata,
61 const Ipp8u* pScalar8, int scalarBitSize,
62 IppsGFpECState* pEC, Ipp8u* pScratchBuffer)
63 {
64 int pointLen = ECP_POINTLEN(pEC);
65
66 /* optimal size of window */
67 const int window_size = 5;
68
69 /* aligned pre-computed table */
70 BNU_CHUNK_T* pTable = (BNU_CHUNK_T*)IPP_ALIGNED_PTR(pScratchBuffer, CACHE_LINE_SIZE);
71 setupTable(pTable, pPdata, pEC);
72
73 {
74 IppsGFpState* pGF = ECP_GFP(pEC);
75 gsModEngine* pGFE = GFP_PMA(pGF);
76 int elemLen = GFP_FELEN(pGFE);
77
78 mod_neg negF = GFP_METHOD(pGFE)->neg;
79
80 BNU_CHUNK_T* pHy = cpGFpGetPool(1, pGFE);
81
82 BNU_CHUNK_T* pTdata = cpEcGFpGetPool(1, pEC); /* points from the pool */
83 BNU_CHUNK_T* pHdata = cpEcGFpGetPool(1, pEC);
84
85 int wvalue;
86 Ipp8u digit, sign;
87 int mask = (1<<(window_size+1)) -1;
88 int bit = scalarBitSize-(scalarBitSize%window_size);
89
90 /* first window */
91 if(bit) {
92 wvalue = *((Ipp16u*)&pScalar8[(bit-1)/8]);
93 wvalue = (wvalue>> ((bit-1)%8)) & mask;
94 }
95 else
96 wvalue = 0;
97 booth_recode(&sign, &digit, (Ipp8u)wvalue, window_size);
98 gsScrambleGet_sscm(pTdata, pointLen, pTable, digit-1, 5-1);
99
100 for(bit-=window_size; bit>=window_size; bit-=window_size) {
101 gfec_point_double(pTdata, pTdata, pEC); /* probablyit's better to have separate calls */
102 gfec_point_double(pTdata, pTdata, pEC); /* instead of gfec_point_double_k() */
103 gfec_point_double(pTdata, pTdata, pEC);
104 gfec_point_double(pTdata, pTdata, pEC);
105 gfec_point_double(pTdata, pTdata, pEC);
106
107 wvalue = *((Ipp16u*)&pScalar8[(bit-1)/8]);
108 wvalue = (wvalue>> ((bit-1)%8)) & mask;
109 booth_recode(&sign, &digit, (Ipp8u)wvalue, window_size);
110 gsScrambleGet_sscm(pHdata, pointLen, pTable, digit-1, 5-1);
111
112 negF(pHy, pHdata+elemLen, pGFE);
113 cpMaskedReplace_ct(pHdata+elemLen, pHy, elemLen, ~cpIsZero_ct(sign));
114 gfec_point_add(pTdata, pTdata, pHdata, pEC);
115 }
116
117 /* last window */
118 gfec_point_double(pTdata, pTdata, pEC);
119 gfec_point_double(pTdata, pTdata, pEC);
120 gfec_point_double(pTdata, pTdata, pEC);
121 gfec_point_double(pTdata, pTdata, pEC);
122 gfec_point_double(pTdata, pTdata, pEC);
123
124 wvalue = *((Ipp16u*)&pScalar8[0]);
125 wvalue = (wvalue << 1) & mask;
126 booth_recode(&sign, &digit, (Ipp8u)wvalue, window_size);
127 gsScrambleGet_sscm(pHdata, pointLen, pTable, digit-1, 5-1);
128
129 negF(pHy, pHdata+elemLen, pGFE);
130 cpMaskedReplace_ct(pHdata+elemLen, pHy, elemLen, ~cpIsZero_ct(sign));
131 gfec_point_add(pTdata, pTdata, pHdata, pEC);
132
133 cpGFpElementCopy(pRdata, pTdata, pointLen);
134
135 cpEcGFpReleasePool(2, pEC);
136 cpGFpReleasePool(1, pGFE);
137 }
138 }
139