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Diffstat (limited to 'ext/ipp/sources/ippcp/pcpgfpecbufsize.c')
| -rw-r--r-- | ext/ipp/sources/ippcp/pcpgfpecbufsize.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/ext/ipp/sources/ippcp/pcpgfpecbufsize.c b/ext/ipp/sources/ippcp/pcpgfpecbufsize.c new file mode 100644 index 0000000..ac89de9 --- /dev/null +++ b/ext/ipp/sources/ippcp/pcpgfpecbufsize.c @@ -0,0 +1,95 @@ +/******************************************************************************* +* 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. +*******************************************************************************/ + +/* +// Intel(R) Integrated Performance Primitives. Cryptography Primitives. +// EC over GF(p^m) definitinons +// +// Context: +// ippsGFpECScratchBufferSize() +// +*/ + +#include "owndefs.h" +#include "owncp.h" +#include "pcpgfpecstuff.h" +#include "pcpeccp.h" + +/*F* +// Name: ippsGFpScratchBufferSize +// +// Purpose: Gets the size of the scratch buffer. +// +// Returns: Reason: +// ippStsNullPtrErr pEC == NULL +// pBufferSize == NULL +// ippStsContextMatchErr invalid pEC->idCtx +// ippStsBadArgErr 0>=nScalars +// nScalars>6 +// ippStsNoErr no error +// +// Parameters: +// nScalars Number of scalar values. +// pEC Pointer to the context of the elliptic curve +// pBufferSize Pointer to the calculated buffer size in bytes. +// +*F*/ + +IPPFUN(IppStatus, ippsGFpECScratchBufferSize,(int nScalars, const IppsGFpECState* pEC, int* pBufferSize)) +{ + IPP_BAD_PTR2_RET(pEC, pBufferSize); + pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) ); + IPP_BADARG_RET( !ECP_TEST_ID(pEC), ippStsContextMatchErr ); + + IPP_BADARG_RET( (0>=nScalars)||(nScalars>IPP_MAX_EXPONENT_NUM), ippStsBadArgErr); + + { + /* select constant size of window */ + const int w = 5; + /* number of table entries */ + const int nPrecomputed = 1<<(w-1); /* because of signed digit representation of scalar is uses */ + + int pointDataSize = ECP_POINTLEN(pEC)*sizeof(BNU_CHUNK_T); + + *pBufferSize = nScalars * pointDataSize*nPrecomputed + CACHE_LINE_SIZE; + + return ippStsNoErr; + } +} |