1 /******************************************************************************* 2 * Copyright 2016-2018 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 // Purpose: 43 // Cryptography Primitive. 44 // HASH based Mask Generation Functions 45 // 46 // Contents: 47 // ippsMGF1_rmf() 48 // 49 */ 50 51 #include "owndefs.h" 52 #include "owncp.h" 53 #include "pcphash_rmf.h" 54 #include "pcptool.h" 55 56 /*F* 57 // Name: ippsMGF1 58 // 59 // Purpose: Mask Generation Functios. 60 // 61 // Returns: Reason: 62 // ippStsNullPtrErr pMask == NULL 63 // pMethod ==NULL 64 // ippStsLengthErr seedLen <0 65 // maskLen <0 66 // ippStsNoErr no errors 67 // 68 // Parameters: 69 // pSeed pointer to the input stream 70 // seedLen input stream length (bytes) 71 // pMaske pointer to the ouput mask 72 // maskLen desired length of mask (bytes) 73 // pMethod hash method 74 // 75 // 76 // Note. 77 // MGF1 defined in the IEEE P1363 standard. 78 // MGF1 defined in the ANSI X9.63 standard and frequently called KDF (key Generation Function). 79 // The fifference between MGF1 and MGF2 is negligible - counter i runs from 0 (in MGF1) and from 1 (in MGF2) 80 *F*/ 81 IPPFUN(IppStatus, ippsMGF1_rmf,(const Ipp8u* pSeed, int seedLen, Ipp8u* pMask, int maskLen, const IppsHashMethod* pMethod)) 82 { 83 IPP_BAD_PTR2_RET(pMask, pMethod); 84 IPP_BADARG_RET((seedLen<0)||(maskLen<0), ippStsLengthErr); 85 86 { 87 /* hash specific */ 88 int hashSize = pMethod->hashLen; 89 90 int i, outLen; 91 92 __ALIGN8 IppsHashState_rmf hashCtx; 93 ippsHashInit_rmf(&hashCtx, pMethod); 94 95 if(!pSeed) 96 seedLen = 0; 97 98 for(i=0,outLen=0; outLen<maskLen; i++) { /* counter i runs from 0 */ 99 Ipp8u cnt[4]; 100 cnt[0] = (Ipp8u)((i>>24) & 0xFF); 101 cnt[1] = (Ipp8u)((i>>16) & 0xFF); 102 cnt[2] = (Ipp8u)((i>>8) & 0xFF); 103 cnt[3] = (Ipp8u)(i & 0xFF); 104 105 ippsHashUpdate_rmf(pSeed, seedLen, &hashCtx); 106 ippsHashUpdate_rmf(cnt, 4, &hashCtx); 107 108 if((outLen + hashSize) <= maskLen) { 109 ippsHashFinal_rmf(pMask+outLen, &hashCtx); 110 outLen += hashSize; 111 } 112 else { 113 Ipp8u md[MAX_HASH_SIZE]; 114 ippsHashFinal_rmf(md, &hashCtx); 115 CopyBlock(md, pMask+outLen, maskLen-outLen); 116 outLen = maskLen; 117 } 118 } 119 120 return ippStsNoErr; 121 } 122 } 123