ext/ipp/sources/ippcp/gsmod_unpackctx.c

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/* 
// 
//  Purpose:
//     Cryptography Primitive. Modular Arithmetic Engine. General Functionality
// 
//  Contents:
//        gsUnpackModEngineCtx()
//
*/

#include "owndefs.h"
#include "owncp.h"
#include "pcpbnumisc.h"
#include "pcpbnuarith.h"
#include "gsmodstuff.h"
#include "pcptool.h"

void gsUnpackModEngineCtx(const Ipp8u* pBuffer, gsModEngine* pCtx)
{
   gsModEngine* pAlignedBuffer = (gsModEngine*)pBuffer;

   /* max modulus length */
   int modSize = MOD_LEN(pAlignedBuffer);
   /* size of context (bytes) without cube and pool buffers */
   int ctxSize = sizeof(gsModEngine)
                +sizeof(BNU_CHUNK_T)*(modSize*3);

   CopyBlock(pAlignedBuffer, pCtx, ctxSize);
   MOD_MODULUS(pCtx)  = (BNU_CHUNK_T*)((Ipp8u*)pCtx + IPP_UINT_PTR(MOD_MODULUS(pAlignedBuffer)));
   MOD_MNT_R(pCtx)    = (BNU_CHUNK_T*)((Ipp8u*)pCtx + IPP_UINT_PTR(MOD_MNT_R(pAlignedBuffer)));
   MOD_MNT_R2(pCtx)   = (BNU_CHUNK_T*)((Ipp8u*)pCtx + IPP_UINT_PTR(MOD_MNT_R2(pAlignedBuffer)));
   MOD_POOL_BUF(pCtx) = MOD_MNT_R2(pCtx) + modSize;
}