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| |
| /* |
| // |
| // Purpose: |
| // Intel(R) Integrated Performance Primitives. Cryptography Primitives. |
| // Internal EC over GF(p^m) basic Definitions & Function Prototypes |
| // |
| // Context: |
| // p521r1_select_ap_w5() |
| // |
| */ |
| |
| #include "owndefs.h" |
| #include "owncp.h" |
| #include "pcpgfpecstuff.h" |
| #include "pcpmask_ct.h" |
| |
| /* |
| // select affine point |
| */ |
| #if (_IPP32E < _IPP32E_M7) |
| void p521r1_select_ap_w5(BNU_CHUNK_T* pVal, const BNU_CHUNK_T* pTbl, int idx) |
| { |
| #define OPERAND_BITSIZE (521) |
| #define LEN_P521 (BITS_BNU_CHUNK(OPERAND_BITSIZE)) |
| #define LEN_P521_APOINT (2*LEN_P521) |
| |
| const int tblLen = 16; |
| int i; |
| unsigned int n; |
| |
| /* clear output affine point */ |
| for(n=0; n<LEN_P521_APOINT; n++) |
| pVal[n] = 0; |
| |
| /* select point */ |
| for(i=1; i<=tblLen; i++) { |
| BNU_CHUNK_T mask = cpIsEqu_ct(i, idx); |
| for(n=0; n<LEN_P521_APOINT; n++) |
| pVal[n] |= (pTbl[n] & mask); |
| pTbl += LEN_P521_APOINT; |
| } |
| |
| #undef OPERAND_BITSIZE |
| #undef LEN_P521 |
| #undef P521_POINT_AFFINE |
| } |
| #endif |
