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     40 
     41 /*
     42 //
     43 //  Purpose:
     44 //     Cryptography Primitive.
     45 //     PRNG Functions
     46 //
     47 //  Contents:
     48 //        cpPRNGenPattern()
     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    returns:
     61       1 random bit string generated
     62      -1 detected internal error (ippStsNoErr != rndFunc())
     63 */
     64 int cpPRNGenPattern(BNU_CHUNK_T* pRand, int bitSize,
     65                     BNU_CHUNK_T botPattern, BNU_CHUNK_T topPattern,
     66                     IppBitSupplier rndFunc, void* pRndParam)
     67 {
     68    BNU_CHUNK_T topMask = MASK_BNU_CHUNK(bitSize);
     69    cpSize randLen = BITS_BNU_CHUNK(bitSize);
     70 
     71    IppStatus sts = rndFunc((Ipp32u*)pRand, bitSize, pRndParam);
     72    if(ippStsNoErr!=sts) return -1;
     73 
     74    pRand[randLen-1] &= topMask;
     75    pRand[0] |= botPattern;
     76    pRand[randLen-1] |= topPattern;
     77    return 1;
     78 }
     79