ext/ipp/sources/ippcp/pcpmontget.c

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

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

/*F*
// Name: ippsMontGet
//
// Purpose: Extracts modulus.
//
// Returns:                   Reason:
//    ippStsNullPtrErr           pMont==NULL
//                               pModulus==NULL
//                               pSize==NULL
//    ippStsContextMatchErr      !MNT_VALID_ID()
//    ippStsNoErr                no errors
//
// Parameters:
//    pModulus    pointer to the modulus buffer
//    pSize       pointer to the modulus length (in Ipp32u chunks).
//    pMont       pointer to the context
*F*/
IPPFUN(IppStatus, ippsMontGet,(Ipp32u* pModulus, int* pSize, const IppsMontState* pMont))
{
    IPP_BAD_PTR3_RET(pMont, pModulus, pSize);

   pMont = (IppsMontState*)(IPP_ALIGNED_PTR((pMont), MONT_ALIGNMENT));
   IPP_BADARG_RET(!MNT_VALID_ID(pMont), ippStsContextMatchErr);

   {
      cpSize len32 = MOD_LEN(MNT_ENGINE(pMont))*sizeof(BNU_CHUNK_T)/sizeof(Ipp32u);
      Ipp32u* bnData = (Ipp32u*) MOD_MODULUS( MNT_ENGINE(pMont) );

      FIX_BNU(bnData, len32);
      COPY_BNU(pModulus, bnData, len32);
      *pSize = len32;

      return ippStsNoErr;
   }
}