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     40 
     41 /*
     42 //
     43 //  Purpose:
     44 //     Cryptography Primitive.
     45 //     PRNG Functions
     46 //
     47 //  Contents:
     48 //        cpPRNGenRange()
     49 //
     50 */
     51 
     52 #include "owndefs.h"
     53 #include "owncp.h"
     54 #include "pcpbn.h"
     55 #include "pcphash.h"
     56 #include "pcpprng.h"
     57 #include "pcptool.h"
     58 
     59 /* generates random string of specified bitSize length
     60    within specified ragnge lo < r < Hi
     61    returns:
     62       0 random bit string not generated
     63       1 random bit string generated
     64      -1 detected internal error (ippStsNoErr != rndFunc())
     65 */
     66 int cpPRNGenRange(BNU_CHUNK_T* pRand,
     67             const BNU_CHUNK_T* pLo, cpSize loLen,
     68             const BNU_CHUNK_T* pHi, cpSize hiLen,
     69                   IppBitSupplier rndFunc, void* pRndParam)
     70 {
     71    int bitSize = BITSIZE_BNU(pHi,hiLen);
     72    BNU_CHUNK_T topMask = MASK_BNU_CHUNK(bitSize);
     73 
     74    #define MAX_COUNT (1000)
     75    int n;
     76    for(n=0; n<MAX_COUNT; n++) {
     77       cpSize randLen;
     78       IppStatus sts = rndFunc((Ipp32u*)pRand, bitSize, pRndParam);
     79       if(ippStsNoErr!=sts) return -1;
     80 
     81       pRand[hiLen-1] &= topMask;
     82       randLen = cpFix_BNU(pRand, hiLen);
     83       if((0 < cpCmp_BNU(pRand, randLen, pLo, loLen)) && (0 < cpCmp_BNU(pHi, hiLen, pRand, randLen)))
     84          return 1;
     85    }
     86    #undef MAX_COUNT
     87 
     88    return 0; /* no random matched to (Lo,Hi) */
     89 }
     90