1 /******************************************************************************* 2 * Copyright 2018 Intel Corporation 3 * All Rights Reserved. 4 * 5 * If this software was obtained under the Intel Simplified Software License, 6 * the following terms apply: 7 * 8 * The source code, information and material ("Material") contained herein is 9 * owned by Intel Corporation or its suppliers or licensors, and title to such 10 * Material remains with Intel Corporation or its suppliers or licensors. The 11 * Material contains proprietary information of Intel or its suppliers and 12 * licensors. The Material is protected by worldwide copyright laws and treaty 13 * provisions. No part of the Material may be used, copied, reproduced, 14 * modified, published, uploaded, posted, transmitted, distributed or disclosed 15 * in any way without Intel's prior express written permission. No license under 16 * any patent, copyright or other intellectual property rights in the Material 17 * is granted to or conferred upon you, either expressly, by implication, 18 * inducement, estoppel or otherwise. Any license under such intellectual 19 * property rights must be express and approved by Intel in writing. 20 * 21 * Unless otherwise agreed by Intel in writing, you may not remove or alter this 22 * notice or any other notice embedded in Materials by Intel or Intel's 23 * suppliers or licensors in any way. 24 * 25 * 26 * If this software was obtained under the Apache License, Version 2.0 (the 27 * "License"), the following terms apply: 28 * 29 * You may not use this file except in compliance with the License. You may 30 * obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 31 * 32 * 33 * Unless required by applicable law or agreed to in writing, software 34 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 35 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 36 * 37 * See the License for the specific language governing permissions and 38 * limitations under the License. 39 *******************************************************************************/ 40 41 /* 42 // Intel(R) Integrated Performance Primitives. Cryptography Primitives. 43 // Operations over GF(p). 44 // 45 // Context: 46 // ippsGFpScratchBufferSize 47 // 48 */ 49 #include "owndefs.h" 50 #include "owncp.h" 51 52 #include "pcpgfpstuff.h" 53 #include "pcpgfpxstuff.h" 54 #include "pcptool.h" 55 56 57 /*F* 58 // Name: ippsGFpScratchBufferSize 59 // 60 // Purpose: Gets the size of the scratch buffer. 61 // 62 // Returns: Reason: 63 // ippStsNullPtrErr pGFp == NULL 64 // pBufferSize == NULL 65 // ippStsContextMatchErr incorrect pGFp's context id 66 // ippStsBadArgErr 0>=nExponents 67 // nExponents>6 68 // ippStsNoErr no error 69 // 70 // Parameters: 71 // nExponents Number of exponents. 72 // ExpBitSize Maximum bit size of the exponents. 73 // pGFp Pointer to the context of the finite field. 74 // pBufferSize Pointer to the calculated buffer size in bytes. 75 // 76 *F*/ 77 78 IPPFUN(IppStatus, ippsGFpScratchBufferSize,(int nExponents, int ExpBitSize, const IppsGFpState* pGFp, int* pBufferSize)) 79 { 80 IPP_BAD_PTR2_RET(pGFp, pBufferSize); 81 pGFp = (IppsGFpState*)( IPP_ALIGNED_PTR(pGFp, GFP_ALIGNMENT) ); 82 IPP_BADARG_RET( !GFP_TEST_ID(pGFp), ippStsContextMatchErr ); 83 84 IPP_BADARG_RET( 0>=nExponents ||nExponents>IPP_MAX_EXPONENT_NUM, ippStsBadArgErr); 85 IPP_BADARG_RET( 0>=ExpBitSize, ippStsBadArgErr); 86 87 { 88 int elmDataSize = GFP_FELEN(GFP_PMA(pGFp))*sizeof(BNU_CHUNK_T); 89 90 /* get window_size */ 91 int w = (nExponents==1)? cpGFpGetOptimalWinSize(ExpBitSize) : /* use optimal window size, if single-scalar operation */ 92 nExponents; /* or pseudo-oprimal if multi-scalar operation */ 93 94 /* number of table entries */ 95 int nPrecomputed = 1<<w; 96 97 *pBufferSize = elmDataSize*nPrecomputed + (CACHE_LINE_SIZE-1); 98 99 return ippStsNoErr; 100 } 101 } 102
