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/*
//
// Purpose:
// Cryptography Primitive.
// PRNG Functions
//
// Contents:
// cpPRNGenRange()
//
*/
#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
within specified ragnge lo < r < Hi
returns:
0 random bit string not generated
1 random bit string generated
-1 detected internal error (ippStsNoErr != rndFunc())
*/
int cpPRNGenRange(BNU_CHUNK_T* pRand,
const BNU_CHUNK_T* pLo, cpSize loLen,
const BNU_CHUNK_T* pHi, cpSize hiLen,
IppBitSupplier rndFunc, void* pRndParam)
{
int bitSize = BITSIZE_BNU(pHi,hiLen);
BNU_CHUNK_T topMask = MASK_BNU_CHUNK(bitSize);
#define MAX_COUNT (1000)
int n;
for(n=0; n<MAX_COUNT; n++) {
cpSize randLen;
IppStatus sts = rndFunc((Ipp32u*)pRand, bitSize, pRndParam);
if(ippStsNoErr!=sts) return -1;
pRand[hiLen-1] &= topMask;
randLen = cpFix_BNU(pRand, hiLen);
if((0 < cpCmp_BNU(pRand, randLen, pLo, loLen)) && (0 < cpCmp_BNU(pHi, hiLen, pRand, randLen)))
return 1;
}
#undef MAX_COUNT
return 0; /* no random matched to (Lo,Hi) */
}