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40 
41 /*
42 //
43 //  Purpose:
44 //     Cryptography Primitive.
45 //     PRNG Functions
46 //
47 //  Contents:
48 //        ippsPRNGSetH0()
49 //
50 */
51 
52 #include "owndefs.h"
53 #include "owncp.h"
54 #include "pcpbn.h"
55 #include "pcpprng.h"
56 
57 /*F*
58 // Name: ippsPRNGSetH0
59 //
60 // Purpose: Sets 160-bit parameter of G() function.
61 //
62 // Returns:                   Reason:
63 //    ippStsNullPtrErr           NULL == pCtx
64 //                               NULL == pH0
65 //
66 //    ippStsContextMatchErr      illegal pCtx->idCtx
67 //                               illegal pH0->idCtx
68 //
69 //    ippStsNoErr                no error
70 //
71 // Parameters:
72 //    pH0      pointer to the parameter used into G() function
73 //    pCtx     pointer to the context
74 *F*/
75 IPPFUN(IppStatus, ippsPRNGSetH0,(const IppsBigNumState* pH0, IppsPRNGState* pCtx))
76 {
77    /* test PRNG context */
78    IPP_BAD_PTR1_RET(pCtx);
79    pCtx = (IppsPRNGState*)( IPP_ALIGNED_PTR(pCtx, PRNG_ALIGNMENT) );
80    IPP_BADARG_RET(!RAND_VALID_ID(pCtx), ippStsContextMatchErr);
81 
82    /* test H0 */
83    IPP_BAD_PTR1_RET(pH0);
84    pH0 = (IppsBigNumState*)( IPP_ALIGNED_PTR(pH0, BN_ALIGNMENT) );
85    IPP_BADARG_RET(!BN_VALID_ID(pH0), ippStsContextMatchErr);
86 
87    {
88       cpSize len = IPP_MIN(5, BN_SIZE(pH0)*(sizeof(BNU_CHUNK_T)/sizeof(Ipp32u)));
89       ZEXPAND_BNU(RAND_T(pCtx), 0, (int)(sizeof(RAND_T(pCtx))/sizeof(BNU_CHUNK_T)));
90       ZEXPAND_COPY_BNU((Ipp32u*)RAND_T(pCtx), (int)(sizeof(RAND_T(pCtx))/sizeof(Ipp32u)),
91                        (Ipp32u*)BN_NUMBER(pH0), len);
92       return ippStsNoErr;
93    }
94 }
95