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Diffstat (limited to 'ext/ipp/sources/ippcp/pcpgfpec_mul.c')
| -rw-r--r-- | ext/ipp/sources/ippcp/pcpgfpec_mul.c | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/ext/ipp/sources/ippcp/pcpgfpec_mul.c b/ext/ipp/sources/ippcp/pcpgfpec_mul.c new file mode 100644 index 0000000..095a634 --- /dev/null +++ b/ext/ipp/sources/ippcp/pcpgfpec_mul.c @@ -0,0 +1,138 @@ +/******************************************************************************* +* Copyright 2010-2018 Intel Corporation +* All Rights Reserved. +* +* If this software was obtained under the Intel Simplified Software License, +* the following terms apply: +* +* The source code, information and material ("Material") contained herein is +* owned by Intel Corporation or its suppliers or licensors, and title to such +* Material remains with Intel Corporation or its suppliers or licensors. The +* Material contains proprietary information of Intel or its suppliers and +* licensors. The Material is protected by worldwide copyright laws and treaty +* provisions. No part of the Material may be used, copied, reproduced, +* modified, published, uploaded, posted, transmitted, distributed or disclosed +* in any way without Intel's prior express written permission. No license under +* any patent, copyright or other intellectual property rights in the Material +* is granted to or conferred upon you, either expressly, by implication, +* inducement, estoppel or otherwise. Any license under such intellectual +* property rights must be express and approved by Intel in writing. +* +* Unless otherwise agreed by Intel in writing, you may not remove or alter this +* notice or any other notice embedded in Materials by Intel or Intel's +* suppliers or licensors in any way. +* +* +* If this software was obtained under the Apache License, Version 2.0 (the +* "License"), the following terms apply: +* +* You may not use this file except in compliance with the License. You may +* obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 +* +* +* Unless required by applicable law or agreed to in writing, software +* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT +* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +* +* See the License for the specific language governing permissions and +* limitations under the License. +*******************************************************************************/ + +/* +// +// Purpose: +// Intel(R) Integrated Performance Primitives. Cryptography Primitives. +// Internal EC over GF(p^m) basic Definitions & Function Prototypes +// +// Context: +// gfec_MulPoint() +// +*/ + +#include "owndefs.h" +#include "owncp.h" +#include "pcpgfpecstuff.h" +#include "gsscramble.h" +#include "pcpmask_ct.h" + + +void gfec_point_mul(BNU_CHUNK_T* pRdata, + const BNU_CHUNK_T* pPdata, + const Ipp8u* pScalar8, int scalarBitSize, + IppsGFpECState* pEC, Ipp8u* pScratchBuffer) +{ + int pointLen = ECP_POINTLEN(pEC); + + /* optimal size of window */ + const int window_size = 5; + + /* aligned pre-computed table */ + BNU_CHUNK_T* pTable = (BNU_CHUNK_T*)IPP_ALIGNED_PTR(pScratchBuffer, CACHE_LINE_SIZE); + setupTable(pTable, pPdata, pEC); + + { + IppsGFpState* pGF = ECP_GFP(pEC); + gsModEngine* pGFE = GFP_PMA(pGF); + int elemLen = GFP_FELEN(pGFE); + + mod_neg negF = GFP_METHOD(pGFE)->neg; + + BNU_CHUNK_T* pHy = cpGFpGetPool(1, pGFE); + + BNU_CHUNK_T* pTdata = cpEcGFpGetPool(1, pEC); /* points from the pool */ + BNU_CHUNK_T* pHdata = cpEcGFpGetPool(1, pEC); + + int wvalue; + Ipp8u digit, sign; + int mask = (1<<(window_size+1)) -1; + int bit = scalarBitSize-(scalarBitSize%window_size); + + /* first window */ + if(bit) { + wvalue = *((Ipp16u*)&pScalar8[(bit-1)/8]); + wvalue = (wvalue>> ((bit-1)%8)) & mask; + } + else + wvalue = 0; + booth_recode(&sign, &digit, (Ipp8u)wvalue, window_size); + gsScrambleGet_sscm(pTdata, pointLen, pTable, digit-1, 5-1); + + for(bit-=window_size; bit>=window_size; bit-=window_size) { + gfec_point_double(pTdata, pTdata, pEC); /* probablyit's better to have separate calls */ + gfec_point_double(pTdata, pTdata, pEC); /* instead of gfec_point_double_k() */ + gfec_point_double(pTdata, pTdata, pEC); + gfec_point_double(pTdata, pTdata, pEC); + gfec_point_double(pTdata, pTdata, pEC); + + wvalue = *((Ipp16u*)&pScalar8[(bit-1)/8]); + wvalue = (wvalue>> ((bit-1)%8)) & mask; + booth_recode(&sign, &digit, (Ipp8u)wvalue, window_size); + gsScrambleGet_sscm(pHdata, pointLen, pTable, digit-1, 5-1); + + negF(pHy, pHdata+elemLen, pGFE); + cpMaskedReplace_ct(pHdata+elemLen, pHy, elemLen, ~cpIsZero_ct(sign)); + gfec_point_add(pTdata, pTdata, pHdata, pEC); + } + + /* last window */ + gfec_point_double(pTdata, pTdata, pEC); + gfec_point_double(pTdata, pTdata, pEC); + gfec_point_double(pTdata, pTdata, pEC); + gfec_point_double(pTdata, pTdata, pEC); + gfec_point_double(pTdata, pTdata, pEC); + + wvalue = *((Ipp16u*)&pScalar8[0]); + wvalue = (wvalue << 1) & mask; + booth_recode(&sign, &digit, (Ipp8u)wvalue, window_size); + gsScrambleGet_sscm(pHdata, pointLen, pTable, digit-1, 5-1); + + negF(pHy, pHdata+elemLen, pGFE); + cpMaskedReplace_ct(pHdata+elemLen, pHy, elemLen, ~cpIsZero_ct(sign)); + gfec_point_add(pTdata, pTdata, pHdata, pEC); + + cpGFpElementCopy(pRdata, pTdata, pointLen); + + cpEcGFpReleasePool(2, pEC); + cpGFpReleasePool(1, pGFE); + } +} |