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40 
41 /*
42 //
43 //  Purpose:
44 //     Cryptography Primitive.
45 //     PRNG Functions
46 //
47 //  Contents:
48 //        ippsPRNGGetSeed()
49 //
50 */
51 
52 #include "owndefs.h"
53 #include "owncp.h"
54 #include "pcpbn.h"
55 #include "pcpprng.h"
56 
57 /*F*
58 // Name: ippsPRNGGetSeed
59 //
60 // Purpose: Get current SEED value from the state
61 //
62 // Returns:                   Reason:
63 //    ippStsNullPtrErr           NULL == pCtx
64 //                               NULL == pSeed
65 //
66 //    ippStsContextMatchErr      illegal pCtx->idCtx
67 //                               illegal pSeed->idCtx
68 //    ippStsOutOfRangeErr        length of the actual SEED > length SEED destination
69 //
70 //    ippStsNoErr                no error
71 //
72 // Parameters:
73 //    pCtx     pointer to the context
74 //    pSeed    pointer to the SEED
75 *F*/
76 IPPFUN(IppStatus, ippsPRNGGetSeed, (const IppsPRNGState* pCtx, IppsBigNumState* pSeed))
77 {
78    /* test PRNG context */
79    IPP_BAD_PTR1_RET(pCtx);
80    pCtx = (IppsPRNGState*)( IPP_ALIGNED_PTR(pCtx, PRNG_ALIGNMENT) );
81    IPP_BADARG_RET(!RAND_VALID_ID(pCtx), ippStsContextMatchErr);
82 
83    /* test seed */
84    IPP_BAD_PTR1_RET(pSeed);
85    pSeed = (IppsBigNumState*)( IPP_ALIGNED_PTR(pSeed, BN_ALIGNMENT) );
86    IPP_BADARG_RET(!BN_VALID_ID(pSeed), ippStsContextMatchErr);
87 
88    return ippsSet_BN(ippBigNumPOS,
89                      BITS2WORD32_SIZE(RAND_SEEDBITS(pCtx)),
90                      (Ipp32u*)RAND_XKEY(pCtx),
91                      pSeed);
92 }
93