1 /******************************************************************************* 2 * Copyright 2010-2018 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 // EC over GF(p^m) definitinons 44 // 45 // Context: 46 // ippsGFpECScratchBufferSize() 47 // 48 */ 49 50 #include "owndefs.h" 51 #include "owncp.h" 52 #include "pcpgfpecstuff.h" 53 #include "pcpeccp.h" 54 55 /*F* 56 // Name: ippsGFpScratchBufferSize 57 // 58 // Purpose: Gets the size of the scratch buffer. 59 // 60 // Returns: Reason: 61 // ippStsNullPtrErr pEC == NULL 62 // pBufferSize == NULL 63 // ippStsContextMatchErr invalid pEC->idCtx 64 // ippStsBadArgErr 0>=nScalars 65 // nScalars>6 66 // ippStsNoErr no error 67 // 68 // Parameters: 69 // nScalars Number of scalar values. 70 // pEC Pointer to the context of the elliptic curve 71 // pBufferSize Pointer to the calculated buffer size in bytes. 72 // 73 *F*/ 74 75 IPPFUN(IppStatus, ippsGFpECScratchBufferSize,(int nScalars, const IppsGFpECState* pEC, int* pBufferSize)) 76 { 77 IPP_BAD_PTR2_RET(pEC, pBufferSize); 78 pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) ); 79 IPP_BADARG_RET( !ECP_TEST_ID(pEC), ippStsContextMatchErr ); 80 81 IPP_BADARG_RET( (0>=nScalars)||(nScalars>IPP_MAX_EXPONENT_NUM), ippStsBadArgErr); 82 83 { 84 /* select constant size of window */ 85 const int w = 5; 86 /* number of table entries */ 87 const int nPrecomputed = 1<<(w-1); /* because of signed digit representation of scalar is uses */ 88 89 int pointDataSize = ECP_POINTLEN(pEC)*sizeof(BNU_CHUNK_T); 90 91 *pBufferSize = nScalars * pointDataSize*nPrecomputed + CACHE_LINE_SIZE; 92 93 return ippStsNoErr; 94 } 95 } 96
