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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