ext/ipp/sources/ippcp/pcpbnarithminv.c

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/* 
//               Intel(R) Integrated Performance Primitives
//                   Cryptographic Primitives (ippcp)
// 
//  Contents:
//     ippsModInv_BN()
// 
*/

#include "owndefs.h"
#include "owncp.h"
#include "pcpbn.h"
#include "pcptool.h"


/*F*
//    Name: ippsModInv_BN
//
// Purpose: Multiplicative Inversion BigNum.
//
// Returns:                Reason:
//    ippStsNullPtrErr        pA  == NULL
//                            pM  == NULL
//                            pInv  == NULL
//    ippStsContextMatchErr   !BN_VALID_ID(pA)
//                            !BN_VALID_ID(pM)
//                            !BN_VALID_ID(pInv)
//    ippStsBadArgErr         A<=0
//    ippStsBadModulusErr     M<=0
//    ippStsScaleRangeErr     A>=M
//    ippStsOutOfRangeErr     pInv can not hold result
//    ippStsNoErr             no errors
//    ippStsBadModulusErr     inversion not found
//
// Parameters:
//    pA    source (value) BigNum
//    pM    source (modulus) BigNum
//    pInv  result BigNum
//
*F*/
IPPFUN(IppStatus, ippsModInv_BN, (IppsBigNumState* pA, IppsBigNumState* pM, IppsBigNumState* pInv) )
{
   IPP_BAD_PTR3_RET(pA, pM, pInv);

   pA = (IppsBigNumState*)( IPP_ALIGNED_PTR(pA, BN_ALIGNMENT) );
   IPP_BADARG_RET(!BN_VALID_ID(pA), ippStsContextMatchErr);
   pM = (IppsBigNumState*)( IPP_ALIGNED_PTR(pM, BN_ALIGNMENT) );
   IPP_BADARG_RET(!BN_VALID_ID(pM), ippStsContextMatchErr);
   pInv = (IppsBigNumState*)( IPP_ALIGNED_PTR(pInv, BN_ALIGNMENT) );
   IPP_BADARG_RET(!BN_VALID_ID(pInv), ippStsContextMatchErr);

    IPP_BADARG_RET(BN_ROOM(pInv) < BN_SIZE(pM), ippStsOutOfRangeErr);
    IPP_BADARG_RET(BN_NEGATIVE(pA) || (BN_SIZE(pA)==1 && BN_NUMBER(pA)[0]==0), ippStsBadArgErr);
    IPP_BADARG_RET(BN_NEGATIVE(pM) || (BN_SIZE(pM)==1 && BN_NUMBER(pM)[0]==0), ippStsBadModulusErr);
    IPP_BADARG_RET(cpCmp_BNU(BN_NUMBER(pA), BN_SIZE(pA), BN_NUMBER(pM), BN_SIZE(pM)) >= 0, ippStsScaleRangeErr);

   {
      cpSize nsR = cpModInv_BNU(BN_NUMBER(pInv),
                                BN_NUMBER(pA), BN_SIZE(pA),
                                BN_NUMBER(pM), BN_SIZE(pM),
                                BN_BUFFER(pInv), BN_BUFFER(pA), BN_BUFFER(pM));
      if(nsR) {
         BN_SIGN(pInv) = ippBigNumPOS;
         BN_SIZE(pInv) = nsR;
         return ippStsNoErr;
      }
      else
         return ippStsBadModulusErr;
    }
}