ext/ipp/sources/ippcp/pcpprngsetmodulus.c

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/* 
// 
//  Purpose:
//     Cryptography Primitive.
//     PRNG Functions
// 
//  Contents:
//        ippsPRNGSetModulus()
//
*/

#include "owndefs.h"
#include "owncp.h"
#include "pcpbn.h"
#include "pcpprng.h"

/*F*
// Name: ippsPRNGSetModulus
//
// Purpose: Sets 160-bit modulus Q.
//
// Returns:                   Reason:
//    ippStsNullPtrErr           NULL == pCtx
//                               NULL == pMod
//
//    ippStsContextMatchErr      illegal pCtx->idCtx
//                               illegal pMod->idCtx
//
//    ippStsBadArgErr            160 != bitsize(pMod)
//
//    ippStsNoErr                no error
//
// Parameters:
//    pMod     pointer to the 160-bit modulus
//    pCtx     pointer to the context
*F*/
IPPFUN(IppStatus, ippsPRNGSetModulus, (const IppsBigNumState* pMod, IppsPRNGState* pCtx))
{
   /* test PRNG context */
   IPP_BAD_PTR1_RET(pCtx);
   pCtx = (IppsPRNGState*)( IPP_ALIGNED_PTR(pCtx, PRNG_ALIGNMENT) );
   IPP_BADARG_RET(!RAND_VALID_ID(pCtx), ippStsContextMatchErr);

   /* test modulus */
   IPP_BAD_PTR1_RET(pMod);
   pMod = (IppsBigNumState*)( IPP_ALIGNED_PTR(pMod, BN_ALIGNMENT) );
   IPP_BADARG_RET(!BN_VALID_ID(pMod), ippStsContextMatchErr);
   IPP_BADARG_RET(160 != BITSIZE_BNU(BN_NUMBER(pMod),BN_SIZE(pMod)), ippStsBadArgErr);

   ZEXPAND_COPY_BNU(RAND_Q(pCtx), (int)(sizeof(RAND_Q(pCtx))/sizeof(BNU_CHUNK_T)), BN_NUMBER(pMod),  BN_SIZE(pMod));
   return ippStsNoErr;
}