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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 /******* FILE MODIFIED FROM ORIGINAL 2019u1 RELEASE TO AVOID WARNINGS *********/ 41 /* 42 // Intel(R) Integrated Performance Primitives. Cryptography Primitives. 43 // 44 // Context: 45 // ippsGFpECVerifyDSA() 46 // 47 */ 48 49 #include "owndefs.h" 50 #include "owncp.h" 51 #include "pcpeccp.h" 52 53 /*F* 54 // Name: ippsGFpECVerifyDSA 55 // 56 // Purpose: DSA Signature Verification. 57 // 58 // Returns: Reason: 59 // ippStsNullPtrErr NULL == pEC 60 // NULL == pMsgDigest 61 // NULL == pRegPublic 62 // NULL == pSignR 63 // NULL == pSignS 64 // NULL == pResult 65 // NULL == pScratchBuffer 66 // 67 // ippStsContextMatchErr illegal pECC->idCtx 68 // pEC->subgroup == NULL 69 // illegal pMsgDigestDigest->idCtx 70 // illegal pRegPublic->idCtx 71 // illegal pSignR->idCtx 72 // illegal pSignS->idCtx 73 // 74 // ippStsMessageErr 0> MsgDigest 75 // order<= MsgDigest 76 // 77 // ippStsRangeErr SignR < 0 or SignS < 0 78 // 79 // ippStsOutOfRangeErr bitsize(pRegPublic) != bitsize(prime) 80 // 81 // ippStsNotSupportedModeErr 1<GFP_EXTDEGREE(pGFE) 82 // 83 // ippStsNoErr no errors 84 // 85 // Parameters: 86 // pMsgDigest pointer to the message representative to being signed 87 // pRegPublic pointer to the regular public key 88 // pSignR,pSignS pointer to the signature 89 // pResult pointer to the result: ippECValid/ippECInvalidSignature 90 // pEC pointer to the ECCP context 91 // pScratchBuffer pointer to buffer (2 mul_point operation) 92 // 93 *F*/ 94 IPPFUN(IppStatus, ippsGFpECVerifyDSA,(const IppsBigNumState* pMsgDigest, 95 const IppsGFpECPoint* pRegPublic, 96 const IppsBigNumState* pSignR, const IppsBigNumState* pSignS, 97 IppECResult* pResult, 98 IppsGFpECState* pEC, 99 Ipp8u* pScratchBuffer)) 100 { 101 IppsGFpState* pGF; 102 gsModEngine* pGFE; 103 104 /* EC context and buffer */ 105 IPP_BAD_PTR2_RET(pEC, pScratchBuffer); 106 pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) ); 107 IPP_BADARG_RET(!ECP_TEST_ID(pEC), ippStsContextMatchErr); 108 IPP_BADARG_RET(!ECP_SUBGROUP(pEC), ippStsContextMatchErr); 109 110 pGF = ECP_GFP(pEC); 111 pGFE = GFP_PMA(pGF); 112 IPP_BADARG_RET(1<GFP_EXTDEGREE(pGFE), ippStsNotSupportedModeErr); 113 114 /* test message representative */ 115 IPP_BAD_PTR1_RET(pMsgDigest); 116 pMsgDigest = (IppsBigNumState*)( IPP_ALIGNED_PTR(pMsgDigest, ALIGN_VAL) ); 117 IPP_BADARG_RET(!BN_VALID_ID(pMsgDigest), ippStsContextMatchErr); 118 IPP_BADARG_RET(BN_NEGATIVE(pMsgDigest), ippStsMessageErr); 119 120 /* test regular public key */ 121 IPP_BAD_PTR1_RET(pRegPublic); 122 IPP_BADARG_RET( !ECP_POINT_TEST_ID(pRegPublic), ippStsContextMatchErr ); 123 IPP_BADARG_RET( ECP_POINT_FELEN(pRegPublic)!=GFP_FELEN(pGFE), ippStsOutOfRangeErr); 124 125 /* test signature */ 126 IPP_BAD_PTR2_RET(pSignR, pSignS); 127 pSignR = (IppsBigNumState*)( IPP_ALIGNED_PTR(pSignR, ALIGN_VAL) ); 128 pSignS = (IppsBigNumState*)( IPP_ALIGNED_PTR(pSignS, ALIGN_VAL) ); 129 IPP_BADARG_RET(!BN_VALID_ID(pSignR), ippStsContextMatchErr); 130 IPP_BADARG_RET(!BN_VALID_ID(pSignS), ippStsContextMatchErr); 131 IPP_BADARG_RET(BN_NEGATIVE(pSignR), ippStsRangeErr); 132 IPP_BADARG_RET(BN_NEGATIVE(pSignS), ippStsRangeErr); 133 134 /* test result */ 135 IPP_BAD_PTR1_RET(pResult); 136 137 { 138 IppECResult vResult = ippECInvalidSignature; 139 140 gsModEngine* pMontR = ECP_MONT_R(pEC); 141 BNU_CHUNK_T* pOrder = MOD_MODULUS(pMontR); 142 int orderLen = MOD_LEN(pMontR); 143 144 /* test mesage: msg<order */ 145 IPP_BADARG_RET((0<=cpCmp_BNU(BN_NUMBER(pMsgDigest), BN_SIZE(pMsgDigest), pOrder, orderLen)), ippStsMessageErr); 146 147 /* test signature value */ 148 if(!cpEqu_BNU_CHUNK(BN_NUMBER(pSignR), BN_SIZE(pSignR), 0) && 149 !cpEqu_BNU_CHUNK(BN_NUMBER(pSignS), BN_SIZE(pSignS), 0) && 150 0>cpCmp_BNU(BN_NUMBER(pSignR), BN_SIZE(pSignR), pOrder, orderLen) && 151 0>cpCmp_BNU(BN_NUMBER(pSignS), BN_SIZE(pSignS), pOrder, orderLen)) { 152 153 int elmLen = GFP_FELEN(pGFE); 154 int pelmLen = GFP_PELEN(pGFE); 155 156 BNU_CHUNK_T* h1 = cpGFpGetPool(3, pGFE); 157 BNU_CHUNK_T* h2 = h1+pelmLen; 158 BNU_CHUNK_T* h = h2+pelmLen; 159 160 //BNU_CHUNK_T* buffMsg = BN_BUFFER(pMsgDigest); 161 162 IppsGFpECPoint P; 163 cpEcGFpInitPoint(&P, cpEcGFpGetPool(1, pEC),0, pEC); 164 165 /* copy message */ 166 ZEXPAND_COPY_BNU(h1, orderLen, BN_NUMBER(pMsgDigest), BN_SIZE(pMsgDigest)); 167 168 /* h = d^-1, h1 = msg*h, h2 = c*h */ 169 ZEXPAND_COPY_BNU(h, orderLen, BN_NUMBER(pSignS),BN_SIZE(pSignS)); 170 gs_mont_inv(h, h, pMontR, alm_mont_inv); 171 172 cpMontMul_BNU(h1, h, h1, pMontR); 173 ZEXPAND_COPY_BNU(h2, orderLen, BN_NUMBER(pSignR),BN_SIZE(pSignR)); 174 cpMontMul_BNU(h2, h, h2, pMontR); 175 176 /* P = [h1]BasePoint + [h2]publicKey */ 177 gfec_BasePointProduct(&P, 178 h1, orderLen, pRegPublic, h2, orderLen, 179 pEC, pScratchBuffer); 180 181 /* get P.X */ 182 if(gfec_GetPoint(h1, NULL, &P, pEC)) { 183 /* c' = int(P.x) mod order */ 184 GFP_METHOD(pGFE)->decode(h1, h1, pGFE); 185 elmLen = cpMod_BNU(h1, elmLen, pOrder, orderLen); 186 cpGFpElementPadd(h1+elmLen, orderLen-elmLen, 0); 187 188 /* and make sure c' = signC */ 189 cpGFpElementCopyPadd(h2, orderLen, BN_NUMBER(pSignR), BN_SIZE(pSignR)); 190 if(GFP_EQ(h1, h2, orderLen)) 191 vResult = ippECValid; 192 } 193 194 cpEcGFpReleasePool(1, pEC); 195 cpGFpReleasePool(3, pGFE); 196 } 197 198 *pResult = vResult; 199 return ippStsNoErr; 200 } 201 } 202