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Diffstat (limited to 'ext/ipp/sources/ippcp/pcpgfpec_getpoint.c')
-rw-r--r-- | ext/ipp/sources/ippcp/pcpgfpec_getpoint.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/ext/ipp/sources/ippcp/pcpgfpec_getpoint.c b/ext/ipp/sources/ippcp/pcpgfpec_getpoint.c new file mode 100644 index 0000000..9cae2f6 --- /dev/null +++ b/ext/ipp/sources/ippcp/pcpgfpec_getpoint.c @@ -0,0 +1,107 @@ +/******************************************************************************* +* 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_GetPoint() +// +*/ + +#include "owndefs.h" +#include "owncp.h" +#include "pcpgfpecstuff.h" +#include "gsscramble.h" + + +#if ( ECP_PROJECTIVE_COORD == JACOBIAN ) +/* returns 1/0 if point is finite/infinite */ +int gfec_GetPoint(BNU_CHUNK_T* pX, BNU_CHUNK_T* pY, const IppsGFpECPoint* pPoint, IppsGFpECState* pEC) +{ + IppsGFpState* pGF = ECP_GFP(pEC); + gsModEngine* pGFE = GFP_PMA(pGF); + int elemLen = GFP_FELEN(pGFE); + + if( !IS_ECP_FINITE_POINT(pPoint) ) { + if(pX) cpGFpElementPadd(pX, elemLen, 0); + if(pY) cpGFpElementPadd(pY, elemLen, 0); + return 0; + } + + /* affine point (1==Z) */ + if( IS_ECP_AFFINE_POINT(pPoint) ) { + if(pX) + cpGFpElementCopy(pX, ECP_POINT_X(pPoint), elemLen); + if(pY) + cpGFpElementCopy(pY, ECP_POINT_Y(pPoint), elemLen); + return 1; + } + + /* projective point (1!=Z) */ + { + mod_mul mulF = GFP_METHOD(pGFE)->mul; + mod_sqr sqrF = GFP_METHOD(pGFE)->sqr; + + /* T = (1/Z)*(1/Z) */ + BNU_CHUNK_T* pT = cpGFpGetPool(1, pGFE); + BNU_CHUNK_T* pZinv = cpGFpGetPool(1, pGFE); + BNU_CHUNK_T* pU = cpGFpGetPool(1, pGFE); + cpGFpxInv(pZinv, ECP_POINT_Z(pPoint), pGFE); + sqrF(pT, pZinv, pGFE); + + if(pX) { + mulF(pU, ECP_POINT_X(pPoint), pT, pGFE); + cpGFpElementCopy(pX, pU, elemLen); + } + if(pY) { + mulF(pT, pZinv, pT, pGFE); + mulF(pU, ECP_POINT_Y(pPoint), pT, pGFE); + cpGFpElementCopy(pY, pU, elemLen); + } + + cpGFpReleasePool(3, pGFE); + return 1; + } +} +#endif |