ext/ipp/sources/ippcp/pcpbngetsize.c

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

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


/*F*
//    Name: ippsBigNumGetSize
//
// Purpose: Returns size of BigNum ctx (bytes).
//
// Returns:                Reason:
//    ippStsNullPtrErr        pCtxSize == NULL
//    ippStsLengthErr         length < 1
//                            length > BITS2WORD32_SIZE(BN_MAXBITSIZE)
//    ippStsNoErr             no errors
//
// Parameters:
//    length  max BN length (32-bits segments)
//    pSize   pointer BigNum ctx size
//
*F*/
IPPFUN(IppStatus, ippsBigNumGetSize, (int length, cpSize *pCtxSize))
{
   IPP_BAD_PTR1_RET(pCtxSize);
   IPP_BADARG_RET(length<1 || length>BITS2WORD32_SIZE(BN_MAXBITSIZE), ippStsLengthErr);

   {
      /* convert length to the number of BNU_CHUNK_T */
      cpSize len = INTERNAL_BNU_LENGTH(length);

      /* reserve one BNU_CHUNK_T more for cpDiv_BNU,
         mul, mont exp operations */
      len++;

      *pCtxSize = sizeof(IppsBigNumState)
                + len*sizeof(BNU_CHUNK_T)
                + len*sizeof(BNU_CHUNK_T)
                + BN_ALIGNMENT-1;

      return ippStsNoErr;
   }
}