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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 41 /* 42 // Intel(R) Integrated Performance Primitives. Cryptography Primitives. 43 // 44 // Context: 45 // ippsGFpECSignNR() 46 // 47 */ 48 49 #include "owndefs.h" 50 #include "owncp.h" 51 #include "pcpeccp.h" 52 53 /*F* 54 // Name: ippsGFpECSignNR 55 // 56 // Purpose: NR Signature Generation. 57 // 58 // Returns: Reason: 59 // ippStsNullPtrErr NULL == pEC 60 // NULL == pMsgDigest 61 // NULL == pRegPrivate 62 // NULL == pEphPrivate 63 // NULL == pSignR 64 // NULL == pSignS 65 // NULL == pScratchBuffer 66 // 67 // ippStsContextMatchErr illegal pEC->idCtx 68 // pEC->subgroup == NULL 69 // illegal pMsgDigest->idCtx 70 // illegal pRegPrivate->idCtx 71 // illegal pEphPrivate->idCtx 72 // illegal pSignR->idCtx 73 // illegal pSignS->idCtx 74 // 75 // ippStsIvalidPrivateKey 0 >= RegPrivate 76 // RegPrivate >= order 77 // 78 // 0 >= EphPrivate 79 // EphPrivate >= order 80 // 81 // ippStsMessageErr pMsgDigest < 0 82 // pMsgDigest >= order 83 // 84 // ippStsRangeErr not enough room for: 85 // signC 86 // signD 87 // 88 // ippStsEphemeralKeyErr (0==signR) || (0==signS) 89 // 90 // ippStsNotSupportedModeErr 1<GFP_EXTDEGREE(pGFE) 91 // 92 // ippStsNoErr no errors 93 // 94 // Parameters: 95 // pMsgDigest pointer to the message representative to be signed 96 // pRegPrivate pointer to the regular private key 97 // pEphPrivate pointer to the ephemeral private key 98 // pSignR,pSignS pointer to the signature 99 // pEC pointer to the EC context 100 // pScratchBuffer pointer to buffer (1 mul_point operation) 101 // 102 *F*/ 103 IPPFUN(IppStatus, ippsGFpECSignNR,(const IppsBigNumState* pMsgDigest, 104 const IppsBigNumState* pRegPrivate, 105 const IppsBigNumState* pEphPrivate, 106 IppsBigNumState* pSignR, IppsBigNumState* pSignS, 107 IppsGFpECState* pEC, 108 Ipp8u* pScratchBuffer)) 109 { 110 IppsGFpState* pGF; 111 gsModEngine* pMontP; 112 113 /* EC context and buffer */ 114 IPP_BAD_PTR2_RET(pEC, pScratchBuffer); 115 pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) ); 116 IPP_BADARG_RET(!ECP_TEST_ID(pEC), ippStsContextMatchErr); 117 IPP_BADARG_RET(!ECP_SUBGROUP(pEC), ippStsContextMatchErr); 118 119 pGF = ECP_GFP(pEC); 120 pMontP = GFP_PMA(pGF); 121 IPP_BADARG_RET(1<GFP_EXTDEGREE(pMontP), ippStsNotSupportedModeErr); 122 123 /* test message representative */ 124 IPP_BAD_PTR1_RET(pMsgDigest); 125 pMsgDigest = (IppsBigNumState*)( IPP_ALIGNED_PTR(pMsgDigest, ALIGN_VAL) ); 126 IPP_BADARG_RET(!BN_VALID_ID(pMsgDigest), ippStsContextMatchErr); 127 IPP_BADARG_RET(BN_NEGATIVE(pMsgDigest), ippStsMessageErr); 128 129 /* test signature */ 130 IPP_BAD_PTR2_RET(pSignR, pSignS); 131 pSignR = (IppsBigNumState*)( IPP_ALIGNED_PTR(pSignR, BN_ALIGNMENT) ); 132 pSignS = (IppsBigNumState*)( IPP_ALIGNED_PTR(pSignS, BN_ALIGNMENT) ); 133 IPP_BADARG_RET(!BN_VALID_ID(pSignR), ippStsContextMatchErr); 134 IPP_BADARG_RET(!BN_VALID_ID(pSignS), ippStsContextMatchErr); 135 IPP_BADARG_RET((BN_ROOM(pSignR)*BITSIZE(BNU_CHUNK_T)<ECP_ORDBITSIZE(pEC)), ippStsRangeErr); 136 IPP_BADARG_RET((BN_ROOM(pSignS)*BITSIZE(BNU_CHUNK_T)<ECP_ORDBITSIZE(pEC)), ippStsRangeErr); 137 138 /* test private keys */ 139 IPP_BAD_PTR2_RET(pRegPrivate, pEphPrivate); 140 141 pRegPrivate = (IppsBigNumState*)( IPP_ALIGNED_PTR(pRegPrivate, ALIGN_VAL) ); 142 IPP_BADARG_RET(!BN_VALID_ID(pRegPrivate), ippStsContextMatchErr); 143 IPP_BADARG_RET(BN_NEGATIVE(pRegPrivate), ippStsIvalidPrivateKey); 144 145 pEphPrivate = (IppsBigNumState*)( IPP_ALIGNED_PTR(pEphPrivate, ALIGN_VAL) ); 146 IPP_BADARG_RET(!BN_VALID_ID(pEphPrivate), ippStsContextMatchErr); 147 IPP_BADARG_RET(BN_NEGATIVE(pEphPrivate), ippStsEphemeralKeyErr); 148 149 { 150 gsModEngine* pMontR = ECP_MONT_R(pEC); 151 BNU_CHUNK_T* pOrder = MOD_MODULUS(pMontR); 152 int ordLen = MOD_LEN(pMontR); 153 154 BNU_CHUNK_T* dataC = BN_NUMBER(pSignR); 155 BNU_CHUNK_T* dataD = BN_NUMBER(pSignS); 156 BNU_CHUNK_T* buffF = BN_BUFFER(pSignR); 157 BNU_CHUNK_T* buffT = BN_BUFFER(pSignS); 158 159 BNU_CHUNK_T* pPriData = BN_NUMBER(pRegPrivate); 160 int priLen = BN_SIZE(pRegPrivate); 161 162 BNU_CHUNK_T* pEphData = BN_NUMBER(pEphPrivate); 163 int ephLen = BN_SIZE(pEphPrivate); 164 165 BNU_CHUNK_T* pMsgData = BN_NUMBER(pMsgDigest); 166 int msgLen = BN_SIZE(pMsgDigest); 167 168 /* test value of private keys: 0 < regPrivate<order, 0 < ephPrivate < order */ 169 IPP_BADARG_RET(cpEqu_BNU_CHUNK(pPriData, priLen, 0) || 170 0<=cpCmp_BNU(pPriData, priLen, pOrder, ordLen), ippStsIvalidPrivateKey); 171 IPP_BADARG_RET(cpEqu_BNU_CHUNK(pEphData, ephLen, 0) || 172 0<=cpCmp_BNU(pEphData, ephLen, pOrder, ordLen), ippStsEphemeralKeyErr); 173 174 /* test mesage: msg < order */ 175 IPP_BADARG_RET(0<=cpCmp_BNU(pMsgData, msgLen, pOrder, ordLen), ippStsMessageErr); 176 177 { 178 int elmLen = GFP_FELEN(pMontP); 179 int ns; 180 181 /* compute ephemeral public key */ 182 IppsGFpECPoint ephPublic; 183 cpEcGFpInitPoint(&ephPublic, cpEcGFpGetPool(1, pEC), 0, pEC); 184 gfec_MulBasePoint(&ephPublic, 185 BN_NUMBER(pEphPrivate), BN_SIZE(pEphPrivate), 186 pEC, pScratchBuffer); 187 188 /* x = (ephPublic.x) mod order */ 189 { 190 BNU_CHUNK_T* buffer = gsModPoolAlloc(pMontP, 1); 191 gfec_GetPoint(buffer, NULL, &ephPublic, pEC); 192 GFP_METHOD(pMontP)->decode(buffer, buffer, pMontP); 193 ns = cpMod_BNU(buffer, elmLen, pOrder, ordLen); 194 cpGFpElementCopyPadd(dataC, ordLen, buffer, ns); 195 gsModPoolFree(pMontP, 1); 196 } 197 cpEcGFpReleasePool(1, pEC); 198 199 /* C = (ephPublic.x + msg) mod order */ 200 ZEXPAND_COPY_BNU(buffF, ordLen, pMsgData, msgLen); 201 cpModAdd_BNU(dataC, dataC, buffF, pOrder, ordLen, dataD); 202 203 if(!GFP_IS_ZERO(dataC, ordLen)) { 204 205 /* signS = (eph_private - private*signR) (mod order) */ 206 ZEXPAND_COPY_BNU(dataD, ordLen, pPriData, priLen); 207 GFP_METHOD(pMontR)->encode(dataD, dataD, pMontR); 208 GFP_METHOD(pMontR)->mul(dataD, dataD, dataC, pMontR); 209 ZEXPAND_COPY_BNU(buffF, ordLen, pEphData, ephLen); 210 cpModSub_BNU(dataD, buffF, dataD, pOrder, ordLen, buffT); 211 212 /* signR */ 213 ns = ordLen; 214 FIX_BNU(dataC, ns); 215 BN_SIGN(pSignR) = ippBigNumPOS; 216 BN_SIZE(pSignR) = ns; 217 /* signS */ 218 ns = ordLen; 219 FIX_BNU(dataD, ns); 220 BN_SIGN(pSignS) = ippBigNumPOS; 221 BN_SIZE(pSignS) = ns; 222 223 return ippStsNoErr; 224 } 225 226 return ippStsEphemeralKeyErr; 227 } 228 } 229 } 230
