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/* 
// 
//  Purpose:
//     Cryptography Primitive.
//     PRNG Functions
// 
//  Contents:
//        cpPRNGenPattern()
//
*/

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

/* generates random string of specified bitSize length
   returns:
      1 random bit string generated
     -1 detected internal error (ippStsNoErr != rndFunc())
*/
int cpPRNGenPattern(BNU_CHUNK_T* pRand, int bitSize,
                    BNU_CHUNK_T botPattern, BNU_CHUNK_T topPattern,
                    IppBitSupplier rndFunc, void* pRndParam)
{
   BNU_CHUNK_T topMask = MASK_BNU_CHUNK(bitSize);
   cpSize randLen = BITS_BNU_CHUNK(bitSize);

   IppStatus sts = rndFunc((Ipp32u*)pRand, bitSize, pRndParam);
   if(ippStsNoErr!=sts) return -1;

   pRand[randLen-1] &= topMask;
   pRand[0] |= botPattern;
   pRand[randLen-1] |= topPattern;
   return 1;
}