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| |
| /* |
| // Intel(R) Integrated Performance Primitives. Cryptography Primitives. |
| // |
| // Context: |
| // ippsGFpECPrivateKey() |
| // |
| */ |
| |
| #include "owndefs.h" |
| #include "owncp.h" |
| #include "pcpgfpecstuff.h" |
| |
| /*F* |
| // Name: ippsGFpECPrivateKey |
| // |
| // Purpose: Generate random private key |
| // |
| // Returns: Reason: |
| // ippStsNullPtrErr NULL == pEC |
| // NULL == pPrivate |
| // |
| // ippStsContextMatchErr illegal pEC->idCtx |
| // pEC->subgroup == NULL |
| // illegal pPrivate->idCtx |
| // |
| // ippStsSizeErr BN_ROOM(pPrivate)*BITSIZE(BNU_CHUNK_T)<ECP_ORDBITSIZE(pEC) |
| // |
| // ippStsNoErr no errors |
| // |
| // Parameters: |
| // pPrivate pointer to the resultant private key |
| // pEC pointer to the EC context |
| // rndFunc Specified Random Generator |
| // pRndParam Pointer to the Random Generator context |
| // |
| *F*/ |
| IPPFUN(IppStatus, ippsGFpECPrivateKey, (IppsBigNumState* pPrivate, IppsGFpECState* pEC, |
| IppBitSupplier rndFunc, void* pRndParam)) |
| { |
| IPP_BAD_PTR2_RET(pEC, rndFunc); |
| |
| /* use aligned EC context */ |
| pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) ); |
| IPP_BADARG_RET(!ECP_TEST_ID(pEC), ippStsContextMatchErr); |
| IPP_BADARG_RET(!ECP_SUBGROUP(pEC), ippStsContextMatchErr); |
| |
| /* test private key */ |
| IPP_BAD_PTR1_RET(pPrivate); |
| pPrivate = (IppsBigNumState*)( IPP_ALIGNED_PTR(pPrivate, ALIGN_VAL) ); |
| IPP_BADARG_RET(!BN_VALID_ID(pPrivate), ippStsContextMatchErr); |
| IPP_BADARG_RET((BN_ROOM(pPrivate)*BITSIZE(BNU_CHUNK_T)<ECP_ORDBITSIZE(pEC)), ippStsSizeErr); |
| |
| { |
| /* generate random private key X: 0 < X < R */ |
| BNU_CHUNK_T* pOrder = MOD_MODULUS(ECP_MONT_R(pEC)); |
| int orderBitLen = ECP_ORDBITSIZE(pEC); |
| int orderLen = BITS_BNU_CHUNK(orderBitLen); |
| |
| BNU_CHUNK_T* pX = BN_NUMBER(pPrivate); |
| int nsX = BITS_BNU_CHUNK(orderBitLen); |
| BNU_CHUNK_T xMask = MASK_BNU_CHUNK(orderBitLen); |
| |
| IppStatus sts; |
| do { |
| sts = rndFunc((Ipp32u*)pX, orderBitLen, pRndParam); |
| if(ippStsNoErr!=sts) |
| break; |
| pX[nsX-1] &= xMask; |
| } while( (1 == cpEqu_BNU_CHUNK(pX, nsX, 0)) || |
| (0 <= cpCmp_BNU(pX, nsX, pOrder, orderLen)) ); |
| |
| /* set up private */ |
| if(ippStsNoErr==sts) { |
| BN_SIGN(pPrivate) = ippBigNumPOS; |
| FIX_BNU(pX, nsX); |
| BN_SIZE(pPrivate) = nsX; |
| } |
| |
| return sts; |
| } |
| } |