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/* 
// 
//  Purpose:
//     Cryptography Primitive.
//     Big Number Operations
// 
//  Contents:
//     ippsSetOctString_BN()
// 
*/

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


/*F*
//    Name: ippsSetOctString_BN
//
// Purpose: Convert octet string into the BN value.
//
// Returns:                   Reason:
//    ippStsNullPtrErr           NULL == pOctStr
//                               NULL == pBN
//
//    ippStsContextMatchErr      !BN_VALID_ID(pBN)
//
//    ippStsLengthErr            0 > strLen
//
//    ippStsSizeErr              BN_ROOM(pBN) is enough for keep actual strLen
//
//    ippStsNoErr                no errors
//
// Parameters:
//    pOctStr     pointer to the source octet string
//    strLen      octet string length
//    pBN         pointer to the target BN
//
*F*/
IPPFUN(IppStatus, ippsSetOctString_BN,(const Ipp8u* pOctStr, int strLen,
                                       IppsBigNumState* pBN))
{
   IPP_BAD_PTR2_RET(pOctStr, pBN);

   pBN = (IppsBigNumState*)( IPP_ALIGNED_PTR(pBN, BN_ALIGNMENT) );
   IPP_BADARG_RET(!BN_VALID_ID(pBN), ippStsContextMatchErr);

   IPP_BADARG_RET((0>strLen), ippStsLengthErr);

   /* remove leading zeros */
   while(strLen && (0==pOctStr[0])) {
      strLen--;
      pOctStr++;
   }

   /* test BN size */
   IPP_BADARG_RET((int)(sizeof(BNU_CHUNK_T)*BN_ROOM(pBN))<strLen, ippStsSizeErr);
   if(strLen)
      BN_SIZE(pBN) = cpFromOctStr_BNU(BN_NUMBER(pBN), pOctStr, strLen);
   else {
      BN_NUMBER(pBN)[0] = (BNU_CHUNK_T)0;
      BN_SIZE(pBN) = 1;
   }
   BN_SIGN(pBN) = ippBigNumPOS;

   return ippStsNoErr;
}