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Diffstat (limited to 'ext/ipp/sources/ippcp/pcpgfpecgetpointoctstring.c')
-rw-r--r-- | ext/ipp/sources/ippcp/pcpgfpecgetpointoctstring.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/ext/ipp/sources/ippcp/pcpgfpecgetpointoctstring.c b/ext/ipp/sources/ippcp/pcpgfpecgetpointoctstring.c new file mode 100644 index 0000000..a47ec18 --- /dev/null +++ b/ext/ipp/sources/ippcp/pcpgfpecgetpointoctstring.c @@ -0,0 +1,107 @@ +/******************************************************************************* +* Copyright 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. +// EC over GF(p) Operations +// +// Context: +// ippsGFpECGetPointOctString() +// +*/ +#include "pcpgfpecessm2.h" +#include "pcpgfpecstuff.h" + +/*F* +// Name: ippsGFpECGetPointOctString +// +// Purpose: Converts a point on EC into x||y octstring +// +// Returns: Reason: +// ippStsNullPtrErr pPoint == NULL / pEC == NULL / pStr == NULL +// ippStsContextMatchErr pEC, pPoint invalid context +// ippStsNotSupportedModeErr pGFE->extdegree > 1 +// ippStsSizeErr strLen is not equal to double GFp element +// ippStsOutOfRangeErr the point does not belong to the EC +// ippStsPointAtInfinity a point on infinity cannot be converted to a string +// ippStsNoErr no errors +// +// Parameters: +// pStr pointer to the string to read from +// strLen length of the string +// pPoint pointer to output point +// pEC EC ctx +// +*F*/ +IPPFUN(IppStatus, ippsGFpECGetPointOctString, (const IppsGFpECPoint* pPoint, + Ipp8u* pStr, int strLen, IppsGFpECState* pEC)) { + IPP_BAD_PTR3_RET(pPoint, pEC, pStr); + IPP_BADARG_RET(pPoint->idCtx != idCtxGFPPoint, ippStsContextMatchErr); + IPP_BADARG_RET(pEC->idCtx != idCtxGFPEC, ippStsContextMatchErr); + IPP_BADARG_RET(!pEC->subgroup, ippStsContextMatchErr); + IPP_BADARG_RET(1 < pEC->pGF->pGFE->extdegree, ippStsNotSupportedModeErr); + + { + gsModEngine* pGFE = pEC->pGF->pGFE; + int elemLen = BITS2WORD8_SIZE(pGFE->modBitLen); + IPP_BADARG_RET(strLen != elemLen * 2, ippStsSizeErr); + IPP_BADARG_RET(pPoint->elementSize != pGFE->modLen, ippStsOutOfRangeErr); + + { + int finitePoint; + IppsGFpElement ptX, ptY; + + cpGFpElementConstruct(&ptX, cpGFpGetPool(1, pGFE), pGFE->modLen); + cpGFpElementConstruct(&ptY, cpGFpGetPool(1, pGFE), pGFE->modLen); + finitePoint = gfec_GetPoint(ptX.pData, ptY.pData, pPoint, pEC); + if (finitePoint) { + ippsGFpGetElementOctString(&ptX, pStr, elemLen, pEC->pGF); + pStr += elemLen; + ippsGFpGetElementOctString(&ptY, pStr, elemLen, pEC->pGF); + } + + cpGFpReleasePool(2, pGFE); /* release ptX and ptY from the pool */ + + return finitePoint ? ippStsNoErr : ippStsPointAtInfinity; + } + } +} |