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| |
| /* |
| // Intel(R) Integrated Performance Primitives. Cryptography Primitives. |
| // GF(p^d) methods |
| // |
| */ |
| #include "owncp.h" |
| |
| #include "pcpgfpxstuff.h" |
| #include "pcpgfpxmethod_com.h" |
| |
| //tbcd: temporary excluded: #include <assert.h> |
| |
| BNU_CHUNK_T* cpGFpxMul_com(BNU_CHUNK_T* pR, const BNU_CHUNK_T* pA, const BNU_CHUNK_T* pB, gsEngine* pGFEx) |
| { |
| int extDegree = GFP_EXTDEGREE(pGFEx); |
| |
| BNU_CHUNK_T* pGFpolynomial = GFP_MODULUS(pGFEx); |
| int degR = extDegree-1; |
| int elemLen= GFP_FELEN(pGFEx); |
| |
| int degB = degR; |
| BNU_CHUNK_T* pTmpProduct = cpGFpGetPool(2, pGFEx); |
| BNU_CHUNK_T* pTmpResult = pTmpProduct + GFP_PELEN(pGFEx); |
| |
| gsEngine* pGroundGFE = GFP_PARENT(pGFEx); |
| BNU_CHUNK_T* r = cpGFpGetPool(1, pGroundGFE); |
| int groundElemLen = GFP_FELEN(pGroundGFE); |
| |
| const BNU_CHUNK_T* pTmpB = GFPX_IDX_ELEMENT(pB, degB, groundElemLen); |
| |
| //tbcd: temporary excluded: assert(NULL!=pTmpProduct && NULL!=r); |
| |
| /* clear temporary */ |
| cpGFpElementPadd(pTmpProduct, elemLen, 0); |
| |
| /* R = A * B[degB-1] */ |
| cpGFpxMul_GFE(pTmpResult, pA, pTmpB, pGFEx); |
| |
| for(degB-=1; degB>=0; degB--) { |
| /* save R[degR-1] */ |
| cpGFpElementCopy(r, GFPX_IDX_ELEMENT(pTmpResult, degR, groundElemLen), groundElemLen); |
| |
| { /* R = R * x */ |
| int j; |
| for (j=degR; j>=1; j--) |
| cpGFpElementCopy(GFPX_IDX_ELEMENT(pTmpResult, j, groundElemLen), GFPX_IDX_ELEMENT(pTmpResult, j-1, groundElemLen), groundElemLen); |
| cpGFpElementPadd(pTmpResult, groundElemLen, 0); |
| } |
| |
| cpGFpxMul_GFE(pTmpProduct, pGFpolynomial, r, pGFEx); |
| GFP_METHOD(pGFEx)->sub(pTmpResult, pTmpResult, pTmpProduct, pGFEx); |
| |
| /* B[degB-i] */ |
| pTmpB -= groundElemLen; |
| cpGFpxMul_GFE(pTmpProduct, pA, pTmpB, pGFEx); |
| GFP_METHOD(pGFEx)->add(pTmpResult, pTmpResult, pTmpProduct, pGFEx); |
| } |
| |
| /* copy result */ |
| cpGFpElementCopy(pR, pTmpResult, elemLen); |
| |
| /* release pools */ |
| cpGFpReleasePool(1, pGroundGFE); |
| cpGFpReleasePool(2, pGFEx); |
| |
| return pR; |
| } |