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     40 
     41 /*
     42 //
     43 //  Purpose:
     44 //     Cryptography Primitive.
     45 //     PRNG Functions
     46 //
     47 //  Contents:
     48 //        ippsPRNGInit()
     49 //
     50 */
     51 
     52 #include "owndefs.h"
     53 #include "owncp.h"
     54 #include "pcpbn.h"
     55 #include "pcpprng.h"
     56 #include "pcphash.h"
     57 #include "pcptool.h"
     58 
     59 /*F*
     60 // Name: ippsPRNGInit
     61 //
     62 // Purpose: Initializes PRNG context
     63 //
     64 // Returns:                   Reason:
     65 //    ippStsNullPtrErr           NULL == pCtx
     66 //
     67 //    ippStsLengthErr            seedBits < 1
     68 //                               seedBits < MAX_XKEY_SIZE
     69 //                               seedBits % 8 !=0
     70 //
     71 //    ippStsNoErr                no error
     72 //
     73 // Parameters:
     74 //    seedBits    seed bitsize
     75 //    pCtx        pointer to the context to be initialized
     76 *F*/
     77 IPPFUN(IppStatus, ippsPRNGInit, (int seedBits, IppsPRNGState* pCtx))
     78 {
     79    /* test PRNG context */
     80    IPP_BAD_PTR1_RET(pCtx);
     81    pCtx = (IppsPRNGState*)( IPP_ALIGNED_PTR(pCtx, PRNG_ALIGNMENT) );
     82 
     83    /* test sizes */
     84    IPP_BADARG_RET((1>seedBits) || (seedBits>MAX_XKEY_SIZE) ||(seedBits&7), ippStsLengthErr);
     85 
     86    {
     87       int hashIvSize = cpHashIvSize(ippHashAlg_SHA1);
     88       const Ipp8u* iv = cpHashIV[ippHashAlg_SHA1];
     89 
     90       /* cleanup context */
     91       ZEXPAND_BNU((Ipp8u*)pCtx, 0, (cpSize)(sizeof(IppsPRNGState)));
     92 
     93       RAND_ID(pCtx) = idCtxPRNG;
     94       RAND_SEEDBITS(pCtx) = seedBits;
     95 
     96       /* default Q parameter */
     97       ((Ipp32u*)RAND_Q(pCtx))[0] = 0xFFFFFFFF;
     98       ((Ipp32u*)RAND_Q(pCtx))[1] = 0xFFFFFFFF;
     99       ((Ipp32u*)RAND_Q(pCtx))[2] = 0xFFFFFFFF;
    100       ((Ipp32u*)RAND_Q(pCtx))[3] = 0xFFFFFFFF;
    101       ((Ipp32u*)RAND_Q(pCtx))[4] = 0xFFFFFFFF;
    102 
    103       /* default T parameter */
    104       CopyBlock(iv, RAND_T(pCtx), hashIvSize);
    105 
    106       return ippStsNoErr;
    107    }
    108 }
    109