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 // 43 // Purpose: 44 // Intel(R) Integrated Performance Primitives. Cryptography Primitives. 45 // EC over GF(p) Operations 46 // 47 // Context: 48 // ippsGFpECTstPointInSubgroup() 49 // 50 */ 51 52 #include "owndefs.h" 53 #include "owncp.h" 54 #include "pcpgfpecstuff.h" 55 #include "pcphash.h" 56 #include "pcphash_rmf.h" 57 58 59 /*F* 60 // Name: ippsGFpECTstPointInSubgroup 61 // 62 // Purpose: Checks if a point belongs to a specified subgroup 63 // 64 // Returns: Reason: 65 // ippStsNullPtrErr pP == NULL 66 // pEC == NULL 67 // pResult == NULL 68 / pScratchBuffer == NULL 69 // 70 // ippStsContextMatchErr invalid pEC->idCtx 71 // pEC->subgroup == NULL 72 // invalid pP->idCtx 73 // 74 // ippStsOutOfRangeErr ECP_POINT_FELEN(pP)!=GFP_FELEN() 75 // 76 // ippStsNoErr no error 77 // 78 // Parameters: 79 // pP Pointer to the IppsGFpECPoint context 80 // pEC Pointer to the context of the elliptic curve 81 // pResult Pointer to the result of the check 82 // pScratchBuffer Pointer to the scratch buffer 83 // 84 *F*/ 85 IPPFUN(IppStatus, ippsGFpECTstPointInSubgroup,(const IppsGFpECPoint* pP, 86 IppECResult* pResult, 87 IppsGFpECState* pEC, 88 Ipp8u* pScratchBuffer)) 89 { 90 IPP_BAD_PTR4_RET(pP, pResult, pEC, pScratchBuffer); 91 pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) ); 92 IPP_BADARG_RET( !ECP_TEST_ID(pEC), ippStsContextMatchErr ); 93 IPP_BADARG_RET(!ECP_SUBGROUP(pEC), ippStsContextMatchErr); 94 IPP_BADARG_RET( !ECP_POINT_TEST_ID(pP), ippStsContextMatchErr ); 95 96 IPP_BADARG_RET( ECP_POINT_FELEN(pP)!=GFP_FELEN(GFP_PMA(ECP_GFP(pEC))), ippStsOutOfRangeErr); 97 98 { 99 IppECResult tstResult; 100 ippsGFpECTstPoint(pP, &tstResult, pEC); 101 102 if(ippECValid==tstResult) { 103 IppsGFpECPoint T; 104 cpEcGFpInitPoint(&T, cpEcGFpGetPool(1, pEC),0, pEC); 105 106 gfec_MulPoint(&T, pP, MOD_MODULUS(ECP_MONT_R(pEC)), BITS_BNU_CHUNK(ECP_ORDBITSIZE(pEC)), /*0,*/ pEC, pScratchBuffer); 107 tstResult = gfec_IsPointAtInfinity(&T)? ippECValid : ippECPointOutOfGroup; 108 109 cpEcGFpReleasePool(1, pEC); 110 } 111 *pResult = tstResult; 112 113 return ippStsNoErr; 114 } 115 } 116