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Diffstat (limited to 'ext/ipp/sources/ippcp/pcpmont_exp_bufsize.h')
| -rw-r--r-- | ext/ipp/sources/ippcp/pcpmont_exp_bufsize.h | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/ext/ipp/sources/ippcp/pcpmont_exp_bufsize.h b/ext/ipp/sources/ippcp/pcpmont_exp_bufsize.h new file mode 100644 index 0000000..95fa88d --- /dev/null +++ b/ext/ipp/sources/ippcp/pcpmont_exp_bufsize.h @@ -0,0 +1,74 @@ +/******************************************************************************* +* Copyright 2005-2018 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: +// Cryptography Primitive. +// DL over Prime Field +// +*/ + +#include "owndefs.h" +#include "owncp.h" +#include "pcpdlp.h" +#include "pcptool.h" + +/* +// Size of scratch buffer, involved in MontExp operation +// +// nExponents - number of exponents +// expBitSize - (max) sizeof exponent (in bits) +// modulusBitSize - size of modulus (bits) +*/ +static cpSize cpMontExpScratchBufferSize(cpSize modulusBitSize, cpSize expBitSize, cpSize nExponents) +{ + /* sizeof table element */ + cpSize elmDataSize = BITS_BNU_CHUNK(modulusBitSize) * sizeof(BNU_CHUNK_T); + /* get window_size */ + cpSize w = (nExponents == 1) ? cpMontExp_WinSize(expBitSize) : /* use optimal window size, if single-scalar operation */ + nExponents; /* or pseudo-oprimal if multi-scalar operation */ + + /* number of table entries */ + cpSize nPrecomputed = 1 << w; + + cpSize bufferSize = elmDataSize*nPrecomputed + (CACHE_LINE_SIZE - 1); + return bufferSize; +}
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