1 /******************************************************************************* 2 * Copyright 2003-2018 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 // Cryptography Primitive. 45 // EC over Prime Finite Field (EC Point operations) 46 // 47 // Contents: 48 // ippsECCPGetPoint() 49 // 50 */ 51 52 #include "owndefs.h" 53 #include "owncp.h" 54 #include "pcpeccp.h" 55 56 /*F* 57 // Name: ippsECCPGetPoint 58 // 59 // Purpose: Converts internal presentation EC point - montgomery projective 60 // into regular affine coordinates EC point (pX,pY) 61 // 62 // Returns: Reason: 63 // ippStsNullPtrErr NULL == pEC 64 // NULL == pPoint 65 // 66 // ippStsContextMatchErr illegal pEC->idCtx 67 // illegal pPoint->idCtx 68 // NULL != pX, illegal pX->idCtx 69 // NULL != pY, illegal pY->idCtx 70 // 71 // ippStsNoErr no errors 72 // 73 // Parameters: 74 // pX pointer to the regular affine coordinate X 75 // pY pointer to the regular affine coordinate Y 76 // pPoint pointer to the EC Point context 77 // pEC pointer to the ECCP context 78 // 79 *F*/ 80 IPPFUN(IppStatus, ippsECCPGetPoint,(IppsBigNumState* pX, IppsBigNumState* pY, 81 const IppsECCPPointState* pPoint, 82 IppsECCPState* pEC)) 83 { 84 /* test pEC */ 85 IPP_BAD_PTR1_RET(pEC); 86 /* use aligned EC context */ 87 pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) ); 88 IPP_BADARG_RET(!ECP_TEST_ID(pEC), ippStsContextMatchErr); 89 90 /* test pX and pY */ 91 if(pX) { 92 pX = (IppsBigNumState*)( IPP_ALIGNED_PTR(pX, ALIGN_VAL) ); 93 IPP_BADARG_RET(!BN_VALID_ID(pX), ippStsContextMatchErr); 94 } 95 if(pY) { 96 pY = (IppsBigNumState*)( IPP_ALIGNED_PTR(pY, ALIGN_VAL) ); 97 IPP_BADARG_RET(!BN_VALID_ID(pY), ippStsContextMatchErr); 98 } 99 100 { 101 IppStatus sts; 102 103 IppsGFpState* pGF = ECP_GFP(pEC); 104 gsModEngine* pGFE = GFP_PMA(pGF); 105 int elemLen = GFP_FELEN(pGFE); 106 107 mod_decode decode = GFP_METHOD(pGFE)->decode; /* gf decode method */ 108 109 IppsGFpElement elmX, elmY; 110 111 cpGFpElementConstruct(&elmX, cpGFpGetPool(1, pGFE), elemLen); 112 cpGFpElementConstruct(&elmY, cpGFpGetPool(1, pGFE), elemLen); 113 do { 114 sts = ippsGFpECGetPoint(pPoint, pX? &elmX:NULL, pY? &elmY:NULL, pEC); 115 if(ippStsNoErr!=sts) break; 116 117 if(pX) { 118 decode(elmX.pData, elmX.pData, pGFE); 119 sts = ippsSet_BN(ippBigNumPOS, GFP_FELEN32(pGFE), (Ipp32u*)elmX.pData, pX); 120 if(ippStsNoErr!=sts) break; 121 } 122 if(pY) { 123 decode(elmY.pData, elmY.pData, pGFE); 124 sts = ippsSet_BN(ippBigNumPOS, GFP_FELEN32(pGFE), (Ipp32u*)elmY.pData, pY); 125 if(ippStsNoErr!=sts) break; 126 } 127 } while(0); 128 129 cpGFpReleasePool(2, pGFE); 130 return sts; 131 } 132 } 133