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Diffstat (limited to 'ext/ipp/sources/ippcp/pcpgfpecpointstuff.c')
| -rw-r--r-- | ext/ipp/sources/ippcp/pcpgfpecpointstuff.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/ext/ipp/sources/ippcp/pcpgfpecpointstuff.c b/ext/ipp/sources/ippcp/pcpgfpecpointstuff.c new file mode 100644 index 0000000..8963716 --- /dev/null +++ b/ext/ipp/sources/ippcp/pcpgfpecpointstuff.c @@ -0,0 +1,117 @@ +/******************************************************************************* +* 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_IsPointOnCurve() +// +*/ + +#include "owndefs.h" +#include "owncp.h" +#include "pcpgfpecstuff.h" +#include "gsscramble.h" + + +#if ( ECP_PROJECTIVE_COORD == JACOBIAN ) +int gfec_IsPointOnCurve(const IppsGFpECPoint* pPoint, IppsGFpECState* pEC) +{ + /* point at infinity does not belong curve */ + if( !IS_ECP_FINITE_POINT(pPoint) ) + //return 1; + return 0; + + /* test that 0 == R = (Y^2) - (X^3 + A*X*(Z^4) + B*(Z^6)) */ + else { + int isOnCurve = 0; + + IppsGFpState* pGF = ECP_GFP(pEC); + gsModEngine* pGFE = GFP_PMA(pGF); + + mod_mul mulF = GFP_METHOD(pGFE)->mul; + mod_sqr sqrF = GFP_METHOD(pGFE)->sqr; + mod_sub subF = GFP_METHOD(pGFE)->sub; + + BNU_CHUNK_T* pX = ECP_POINT_X(pPoint); + BNU_CHUNK_T* pY = ECP_POINT_Y(pPoint); + BNU_CHUNK_T* pZ = ECP_POINT_Z(pPoint); + + BNU_CHUNK_T* pR = cpGFpGetPool(1, pGFE); + BNU_CHUNK_T* pT = cpGFpGetPool(1, pGFE); + + sqrF(pR, pY, pGFE); /* R = Y^2 */ + sqrF(pT, pX, pGFE); /* T = X^3 */ + mulF(pT, pX, pT, pGFE); + subF(pR, pR, pT, pGFE); /* R -= T */ + + if( IS_ECP_AFFINE_POINT(pPoint) ) { + mulF(pT, pX, ECP_A(pEC), pGFE); /* T = A*X */ + subF(pR, pR, pT, pGFE); /* R -= T */ + subF(pR, pR, ECP_B(pEC), pGFE); /* R -= B */ + } + else { + BNU_CHUNK_T* pZ4 = cpGFpGetPool(1, pGFE); + BNU_CHUNK_T* pZ6 = cpGFpGetPool(1, pGFE); + + sqrF(pZ6, pZ, pGFE); /* Z^2 */ + sqrF(pZ4, pZ6, pGFE); /* Z^4 */ + mulF(pZ6, pZ6, pZ4, pGFE); /* Z^6 */ + + mulF(pZ4, pZ4, pX, pGFE); /* X*(Z^4) */ + mulF(pZ4, pZ4, ECP_A(pEC), pGFE); /* A*X*(Z^4) */ + mulF(pZ6, pZ6, ECP_B(pEC), pGFE); /* B*(Z^4) */ + + subF(pR, pR, pZ4, pGFE); /* R -= A*X*(Z^4) */ + subF(pR, pR, pZ6, pGFE); /* R -= B*(Z^6) */ + + cpGFpReleasePool(2, pGFE); + } + + isOnCurve = GFP_IS_ZERO(pR, GFP_FELEN(pGFE)); + cpGFpReleasePool(2, pGFE); + return isOnCurve; + } +} +#endif |