| /******************************************************************************* |
| * Copyright 2003-2018 Intel Corporation |
| * All Rights Reserved. |
| * |
| * If this software was obtained under the Intel Simplified Software License, |
| * the following terms apply: |
| * |
| * The source code, information and material ("Material") contained herein is |
| * owned by Intel Corporation or its suppliers or licensors, and title to such |
| * Material remains with Intel Corporation or its suppliers or licensors. The |
| * Material contains proprietary information of Intel or its suppliers and |
| * licensors. The Material is protected by worldwide copyright laws and treaty |
| * provisions. No part of the Material may be used, copied, reproduced, |
| * modified, published, uploaded, posted, transmitted, distributed or disclosed |
| * in any way without Intel's prior express written permission. No license under |
| * any patent, copyright or other intellectual property rights in the Material |
| * is granted to or conferred upon you, either expressly, by implication, |
| * inducement, estoppel or otherwise. Any license under such intellectual |
| * property rights must be express and approved by Intel in writing. |
| * |
| * Unless otherwise agreed by Intel in writing, you may not remove or alter this |
| * notice or any other notice embedded in Materials by Intel or Intel's |
| * suppliers or licensors in any way. |
| * |
| * |
| * If this software was obtained under the Apache License, Version 2.0 (the |
| * "License"), the following terms apply: |
| * |
| * You may not use this file except in compliance with the License. You may |
| * obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| *******************************************************************************/ |
| |
| /* |
| // |
| // Purpose: |
| // Cryptography Primitive. |
| // EC over Prime Finite Field (Verify Signature, NR version) |
| // |
| // Contents: |
| // ippsECCPVerifyNR() |
| // |
| // |
| */ |
| |
| #include "owndefs.h" |
| #include "owncp.h" |
| #include "pcpeccp.h" |
| |
| |
| /*F* |
| // Name: ippsECCPVerifyNR |
| // |
| // Purpose: Verify Signature (NR version). |
| // |
| // Returns: Reason: |
| // ippStsNullPtrErr NULL == pEC |
| // NULL == pMsgDigest |
| // NULL == pSignX |
| // NULL == pSignY |
| // NULL == pResult |
| // |
| // ippStsContextMatchErr illegal pEC->idCtx |
| // illegal pMsgDigest->idCtx |
| // illegal pSignX->idCtx |
| // illegal pSignY->idCtx |
| // |
| // ippStsMessageErr 0> MsgDigest |
| // order<= MsgDigest |
| // |
| // ippStsRangeErr SignX < 0 or SignY < 0 |
| // |
| // ippStsNoErr no errors |
| // |
| // Parameters: |
| // pMsgDigest pointer to the message representative to be signed |
| // pSignX,pSignY pointer to the signature |
| // pResult pointer to the result: ippECValid/ippECInvalidSignature |
| // pEC pointer to the ECCP context |
| // |
| // Note: |
| // - signer's key must be set up in ECCP context |
| // before ippsECCPVerifyNR() usage |
| // |
| *F*/ |
| IPPFUN(IppStatus, ippsECCPVerifyNR,(const IppsBigNumState* pMsgDigest, |
| const IppsBigNumState* pSignX, const IppsBigNumState* pSignY, |
| IppECResult* pResult, |
| IppsECCPState* pEC)) |
| { |
| gsModEngine* pModEngine; |
| BNU_CHUNK_T* pOrder; |
| int orderLen; |
| |
| BNU_CHUNK_T* pMsgData; |
| int msgLen; |
| |
| /* use aligned EC context */ |
| IPP_BAD_PTR1_RET(pEC); |
| pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) ); |
| IPP_BADARG_RET(!ECP_TEST_ID(pEC), ippStsContextMatchErr); |
| |
| pModEngine = ECP_MONT_R(pEC); |
| pOrder = MOD_MODULUS(pModEngine); |
| orderLen = MOD_LEN(pModEngine); |
| |
| /* test message representative */ |
| IPP_BAD_PTR1_RET(pMsgDigest); |
| pMsgDigest = (IppsBigNumState*)( IPP_ALIGNED_PTR(pMsgDigest, ALIGN_VAL) ); |
| IPP_BADARG_RET(!BN_VALID_ID(pMsgDigest), ippStsContextMatchErr); |
| IPP_BADARG_RET(BN_NEGATIVE(pMsgDigest), ippStsMessageErr); |
| |
| pMsgData = BN_NUMBER(pMsgDigest); |
| msgLen = BN_SIZE(pMsgDigest); |
| IPP_BADARG_RET(0<=cpCmp_BNU(pMsgData, msgLen, pOrder, orderLen), ippStsMessageErr); |
| |
| /* test result */ |
| IPP_BAD_PTR1_RET(pResult); |
| |
| /* test signature */ |
| IPP_BAD_PTR2_RET(pSignX,pSignY); |
| pSignX = (IppsBigNumState*)( IPP_ALIGNED_PTR(pSignX, ALIGN_VAL) ); |
| pSignY = (IppsBigNumState*)( IPP_ALIGNED_PTR(pSignY, ALIGN_VAL) ); |
| IPP_BADARG_RET(!BN_VALID_ID(pSignX), ippStsContextMatchErr); |
| IPP_BADARG_RET(!BN_VALID_ID(pSignY), ippStsContextMatchErr); |
| IPP_BADARG_RET(BN_NEGATIVE(pSignX), ippStsRangeErr); |
| IPP_BADARG_RET(BN_NEGATIVE(pSignY), ippStsRangeErr); |
| |
| { |
| IppECResult vResult = ippECInvalidSignature; |
| |
| IppsGFpState* pGF = ECP_GFP(pEC); |
| gsModEngine* pGFE = GFP_PMA(pGF); |
| |
| int elmLen = GFP_FELEN(pGFE); |
| int pelmLen = GFP_PELEN(pGFE); |
| |
| BNU_CHUNK_T* pH1 = cpGFpGetPool(3, pGFE); |
| BNU_CHUNK_T* pH2 = pH1 + pelmLen; |
| BNU_CHUNK_T* pR1 = pH2 + pelmLen; |
| BNU_CHUNK_T* pF = pR1 + pelmLen; |
| |
| /* test signature value */ |
| if(0<cpBN_tst(pSignX) && 0<cpBN_tst(pSignY) && |
| 0>cpCmp_BNU(BN_NUMBER(pSignX),BN_SIZE(pSignX), pOrder,orderLen) && |
| 0>cpCmp_BNU(BN_NUMBER(pSignY),BN_SIZE(pSignY), pOrder,orderLen)) { |
| |
| /* validate signature */ |
| IppsGFpECPoint P, G, Public; |
| cpEcGFpInitPoint(&P, cpEcGFpGetPool(1, pEC),0, pEC); |
| cpEcGFpInitPoint(&G, ECP_G(pEC), ECP_AFFINE_POINT|ECP_FINITE_POINT, pEC); |
| cpEcGFpInitPoint(&Public, ECP_PUBLIC(pEC), ECP_FINITE_POINT, pEC); |
| |
| /* expand signature: H1 = signY, H2 = signX */ |
| cpGFpElementCopyPadd(pH1, orderLen, BN_NUMBER(pSignY), BN_SIZE(pSignY)); |
| cpGFpElementCopyPadd(pH2, orderLen, BN_NUMBER(pSignX), BN_SIZE(pSignX)); |
| |
| /* compute H1*BasePoint + H2*publicKey */ |
| gfec_BasePointProduct(&P, |
| pH1, orderLen, &Public, pH2, orderLen, |
| pEC, (Ipp8u*)ECP_SBUFFER(pEC)); |
| |
| /* P.X */ |
| if(gfec_GetPoint(pH1, NULL, &P, pEC)) { |
| /* H1 = int(P.X) mod order */ |
| GFP_METHOD(pGFE)->decode(pH1, pH1, pGFE); |
| elmLen = cpMod_BNU(pH1, elmLen, pOrder, orderLen); |
| cpGFpElementPadd(pH1+elmLen, orderLen-elmLen, 0); |
| |
| /* recovered message: (SignX - H1) mod order */ |
| cpModSub_BNU(pH1, pH2, pH1, pOrder, orderLen, pF); |
| |
| /* and compare with input message*/ |
| cpGFpElementCopyPadd(pH2, orderLen, pMsgData, msgLen); |
| if(GFP_EQ(pH1, pH2, orderLen)) |
| vResult = ippECValid; |
| } |
| |
| cpEcGFpReleasePool(1, pEC); |
| cpGFpReleasePool(3, pGFE); |
| } |
| |
| *pResult = vResult; |
| return ippStsNoErr; |
| } |
| } |
