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     40 
     41 /*
     42 //
     43 //  Purpose:
     44 //     Cryptography Primitive.
     45 //     EC over Prime Finite Field (EC Key Generation)
     46 //
     47 //  Contents:
     48 //     ippsECCPGenKeyPair()
     49 //
     50 //
     51 */
     52 
     53 #include "owndefs.h"
     54 #include "owncp.h"
     55 #include "pcpeccp.h"
     56 
     57 
     58 /*F*
     59 //    Name: ippsECCPGenKeyPair
     60 //
     61 // Purpose: Generate (private,public) Key Pair
     62 //
     63 // Returns:                Reason:
     64 //    ippStsNullPtrErr        NULL == pEC
     65 //                            NULL == pPrivate
     66 //                            NULL == pPublic
     67 //
     68 //    ippStsContextMatchErr   illegal pEC->idCtx
     69 //                            illegal pPrivate->idCtx
     70 //                            illegal pPublic->idCtx
     71 //
     72 //    ippStsNoErr             no errors
     73 //
     74 // Parameters:
     75 //    pPrivate    pointer to the resultant private key
     76 //    pPublic     pointer to the resultant public  key
     77 //    pEC        pointer to the ECCP context
     78 //    rndFunc     Specified Random Generator.
     79 //    pRndParam   Pointer to the Random Generator context.
     80 //
     81 *F*/
     82 IPPFUN(IppStatus, ippsECCPGenKeyPair, (IppsBigNumState* pPrivate, IppsECCPPointState* pPublic,
     83                                        IppsECCPState* pEC,
     84                                        IppBitSupplier rndFunc, void* pRndParam))
     85 {
     86    IPP_BAD_PTR2_RET(pEC, rndFunc);
     87 
     88    /* use aligned EC context */
     89    pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) );
     90    IPP_BADARG_RET(!ECP_TEST_ID(pEC), ippStsContextMatchErr);
     91 
     92    /* test private/public keys */
     93    IPP_BAD_PTR2_RET(pPrivate,pPublic);
     94    pPrivate = (IppsBigNumState*)( IPP_ALIGNED_PTR(pPrivate, ALIGN_VAL) );
     95    IPP_BADARG_RET(!BN_VALID_ID(pPrivate), ippStsContextMatchErr);
     96    IPP_BADARG_RET((BN_ROOM(pPrivate)*BITSIZE(BNU_CHUNK_T)<ECP_ORDBITSIZE(pEC)), ippStsSizeErr);
     97 
     98    IPP_BADARG_RET( !ECP_POINT_TEST_ID(pPublic), ippStsContextMatchErr );
     99    IPP_BADARG_RET(ECP_POINT_FELEN(pPublic)<GFP_FELEN(GFP_PMA(ECP_GFP(pEC))), ippStsRangeErr);
    100 
    101    {
    102       /* generate random private key X:  0 < X < R */
    103       gsModEngine* pModEngine =ECP_MONT_R(pEC);
    104       BNU_CHUNK_T* pOrder = MOD_MODULUS(pModEngine);
    105       int orderBitLen = ECP_ORDBITSIZE(pEC);
    106       int orderLen = BITS_BNU_CHUNK(orderBitLen);
    107 
    108       BNU_CHUNK_T* pX = BN_NUMBER(pPrivate);
    109       int nsX = BITS_BNU_CHUNK(orderBitLen);
    110       BNU_CHUNK_T xMask = MASK_BNU_CHUNK(orderBitLen);
    111 
    112       IppStatus sts;
    113       do {
    114          sts = rndFunc((Ipp32u*)pX, orderBitLen, pRndParam);
    115          if(ippStsNoErr != sts)
    116             break;
    117          pX[nsX-1] &= xMask;
    118       } while( (1 == cpEqu_BNU_CHUNK(pX, nsX, 0)) ||
    119                (0 <= cpCmp_BNU(pX, nsX, pOrder, orderLen)) );
    120 
    121       if(ippStsNoErr != sts)
    122          return ippStsErr;
    123 
    124       /* set up private */
    125       BN_SIGN(pPrivate) = ippBigNumPOS;
    126       FIX_BNU(pX, nsX);
    127       BN_SIZE(pPrivate) = nsX;
    128 
    129       /* calculate public key */
    130       gfec_MulBasePoint(pPublic, pX, nsX, pEC, (Ipp8u*)ECP_SBUFFER(pEC));
    131 
    132       return ippStsNoErr;
    133    }
    134 }
    135