| /******************************************************************************* |
| * 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. |
| // |
| // Context: |
| // cpMontMultiExpInitArray() |
| // |
| */ |
| |
| #include "owndefs.h" |
| #include "owncp.h" |
| #include "pcpbn.h" |
| #include "pcpmontgomery.h" |
| |
| /* |
| // Intel(R) Integrated Performance Primitives |
| // Cryptographic Primitives (ippcp) |
| // |
| // |
| */ |
| /* |
| // Initialize multi-exponentiation computation |
| // y = x[0]^e[0] * x[1]^e[1] *...* x[numItems-1]^e[numItems-1] mod M |
| // |
| // Output: |
| // - table pTbl of precomuted values pTbl[i] = x[0]^i[0] * x[1]^i[1] *...* x[numItems-1]^i[numItems-1] mod M, |
| // where i[0], i[1], ..., i[numItems-1] are bits of i value; |
| // |
| // Input: |
| // - array of pointers to the BNU bases x[0], x[1],...,x[numItems-1] |
| // - pointer to the Montgomery engine |
| */ |
| void cpMontMultiExpInitArray(BNU_CHUNK_T* pPrecomTbl, |
| const BNU_CHUNK_T** ppX, cpSize xItemBitSize, |
| cpSize numItems, |
| gsModEngine* pModEngine) |
| { |
| cpSize sizeM = MOD_LEN(pModEngine); |
| |
| cpSize i, base; |
| cpSize sizeX = BITS_BNU_CHUNK(xItemBitSize); |
| |
| /* buff[0] = mont(1) */ |
| COPY_BNU(pPrecomTbl, MOD_MNT_R(pModEngine), sizeM); |
| /* buff[1] = X[0] */ |
| ZEXPAND_COPY_BNU(pPrecomTbl+sizeM, sizeM, ppX[0], sizeX); |
| |
| for(i=1,base=2*sizeM; i<numItems; i++,base*=2) { |
| /* buf[base] = X[i] */ |
| ZEXPAND_COPY_BNU(pPrecomTbl+base, sizeM, ppX[i], sizeX); |
| |
| { |
| int nPasses = 1; |
| int step = base/2; |
| |
| int k; |
| for(k=i-1; k>=0; k--) { |
| const BNU_CHUNK_T* pXterm = ppX[k]; |
| |
| BNU_CHUNK_T* pBufferBase = pPrecomTbl+base; |
| int n; |
| for(n=1; n<=nPasses; n++, pBufferBase+=2*step) { |
| cpMontMul_BNU_EX(pBufferBase+step, |
| pBufferBase, sizeM, |
| pXterm, sizeX, |
| pModEngine); |
| } |
| |
| nPasses *= 2; |
| step /= 2; |
| } |
| } |
| } |
| } |