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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 // 43 // Purpose: 44 // Cryptography Primitive. 45 // EC over Prime Finite Field (setup/retrieve domain parameters) 46 // 47 // Contents: 48 // ippsECCPGet() 49 // 50 */ 51 52 #include "owndefs.h" 53 #include "owncp.h" 54 #include "pcpeccp.h" 55 56 /*F* 57 // Name: ippsECCPGet 58 // 59 // Purpose: Retrieve ECC Domain Parameter. 60 // 61 // Returns: Reason: 62 // ippStsNullPtrErr NULL == pPrime 63 // NULL == pA 64 // NULL == pB 65 // NULL == pGX 66 // NULL == pGY 67 // NULL == pOrder 68 // NULL == cofactor 69 // NULL == pEC 70 // 71 // ippStsContextMatchErr illegal pPrime->idCtx 72 // illegal pA->idCtx 73 // illegal pB->idCtx 74 // illegal pGX->idCtx 75 // illegal pGY->idCtx 76 // illegal pOrder->idCtx 77 // illegal pEC->idCtx 78 // 79 // ippStsRangeErr not enough room for: 80 // pPrime 81 // pA, pB, 82 // pGX,pGY 83 // pOrder 84 // 85 // ippStsNoErr no errors 86 // 87 // Parameters: 88 // pPrime pointer to the retrieval prime (specify FG(p)) 89 // pA pointer to the retrieval A coefficient of EC equation 90 // pB pointer to the retrieval B coefficient of EC equation 91 // pGX,pGY pointer to the retrieval Base Point (x and y coordinates) of EC 92 // pOrder pointer to the retrieval Base Point order 93 // cofactor pointer to the retrieval cofactor value 94 // pEC pointer to the ECC context 95 // 96 *F*/ 97 IPPFUN(IppStatus, ippsECCPGet, (IppsBigNumState* pPrime, 98 IppsBigNumState* pA, IppsBigNumState* pB, 99 IppsBigNumState* pGX,IppsBigNumState* pGY, 100 IppsBigNumState* pOrder, int* cofactor, 101 IppsECCPState* pEC)) 102 { 103 IppsGFpState* pGF; 104 gsModEngine* pGFE; 105 106 /* test pEC */ 107 IPP_BAD_PTR1_RET(pEC); 108 /* use aligned EC context */ 109 pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) ); 110 IPP_BADARG_RET(!ECP_TEST_ID(pEC), ippStsContextMatchErr); 111 112 pGF = ECP_GFP(pEC); 113 pGFE = GFP_PMA(pGF); 114 115 /* test pPrime */ 116 IPP_BAD_PTR1_RET(pPrime); 117 pPrime = (IppsBigNumState*)( IPP_ALIGNED_PTR(pPrime, ALIGN_VAL) ); 118 IPP_BADARG_RET(!BN_VALID_ID(pPrime), ippStsContextMatchErr); 119 IPP_BADARG_RET(BN_ROOM(pPrime)<GFP_FELEN(pGFE), ippStsRangeErr); 120 121 /* test pA and pB */ 122 IPP_BAD_PTR2_RET(pA,pB); 123 pA = (IppsBigNumState*)( IPP_ALIGNED_PTR(pA, ALIGN_VAL) ); 124 pB = (IppsBigNumState*)( IPP_ALIGNED_PTR(pB, ALIGN_VAL) ); 125 IPP_BADARG_RET(!BN_VALID_ID(pA), ippStsContextMatchErr); 126 IPP_BADARG_RET(!BN_VALID_ID(pB), ippStsContextMatchErr); 127 IPP_BADARG_RET(BN_ROOM(pA)<GFP_FELEN(pGFE), ippStsRangeErr); 128 IPP_BADARG_RET(BN_ROOM(pB)<GFP_FELEN(pGFE), ippStsRangeErr); 129 130 /* test pG and pGorder pointers */ 131 IPP_BAD_PTR3_RET(pGX,pGY, pOrder); 132 pGX = (IppsBigNumState*)( IPP_ALIGNED_PTR(pGX, ALIGN_VAL) ); 133 pGY = (IppsBigNumState*)( IPP_ALIGNED_PTR(pGY, ALIGN_VAL) ); 134 pOrder= (IppsBigNumState*)( IPP_ALIGNED_PTR(pOrder,ALIGN_VAL) ); 135 IPP_BADARG_RET(!BN_VALID_ID(pGX), ippStsContextMatchErr); 136 IPP_BADARG_RET(!BN_VALID_ID(pGY), ippStsContextMatchErr); 137 IPP_BADARG_RET(!BN_VALID_ID(pOrder), ippStsContextMatchErr); 138 IPP_BADARG_RET(BN_ROOM(pGX)<GFP_FELEN(pGFE), ippStsRangeErr); 139 IPP_BADARG_RET(BN_ROOM(pGY)<GFP_FELEN(pGFE), ippStsRangeErr); 140 IPP_BADARG_RET((BN_ROOM(pOrder)*BITSIZE(BNU_CHUNK_T)<ECP_ORDBITSIZE(pEC)), ippStsRangeErr); 141 142 /* test cofactor */ 143 IPP_BAD_PTR1_RET(cofactor); 144 145 { 146 mod_decode decode = GFP_METHOD(pGFE)->decode; /* gf decode method */ 147 BNU_CHUNK_T* tmp = cpGFpGetPool(1, pGFE); 148 149 /* retrieve EC parameter */ 150 ippsSet_BN(ippBigNumPOS, GFP_FELEN32(pGFE), (Ipp32u*)GFP_MODULUS(pGFE), pPrime); 151 152 decode(tmp, ECP_A(pEC), pGFE); 153 ippsSet_BN(ippBigNumPOS, GFP_FELEN32(pGFE), (Ipp32u*)tmp, pA); 154 decode(tmp, ECP_B(pEC), pGFE); 155 ippsSet_BN(ippBigNumPOS, GFP_FELEN32(pGFE), (Ipp32u*)tmp, pB); 156 157 decode(tmp, ECP_G(pEC), pGFE); 158 ippsSet_BN(ippBigNumPOS, GFP_FELEN32(pGFE), (Ipp32u*)tmp, pGX); 159 decode(tmp, ECP_G(pEC)+GFP_FELEN(pGFE), pGFE); 160 ippsSet_BN(ippBigNumPOS, GFP_FELEN32(pGFE), (Ipp32u*)tmp, pGY); 161 162 { 163 gsModEngine* pR = ECP_MONT_R(pEC); 164 ippsSet_BN(ippBigNumPOS, MOD_LEN(pR)*sizeof(BNU_CHUNK_T)/sizeof(Ipp32u), (Ipp32u*)MOD_MODULUS(pR), pOrder); 165 } 166 167 *cofactor = (int)ECP_COFACTOR(pEC)[0]; 168 169 cpGFpReleasePool(1, pGFE); 170 return ippStsNoErr; 171 } 172 } 173