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/* 
//     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
//     EC over GF(p^m) definitinons
// 
//     Context:
//        cpGFpECGetSize()
//
*/

#include "owndefs.h"
#include "owncp.h"
#include "pcpgfpecstuff.h"
#include "pcpeccp.h"


int cpGFpECGetSize(int basicDeg, int basicElmBitSize)
{
   int ctxSize = 0;
   int elemLen = basicDeg*BITS_BNU_CHUNK(basicElmBitSize);

   int maxOrderBits = 1+ basicDeg*basicElmBitSize;
   #if defined(_LEGACY_ECCP_SUPPORT_)
   int maxOrderLen = BITS_BNU_CHUNK(maxOrderBits);
   #endif

   int modEngineCtxSize;
   if(ippStsNoErr==gsModEngineGetSize(maxOrderBits, MONT_DEFAULT_POOL_LENGTH, &modEngineCtxSize)) {

      ctxSize = sizeof(IppsGFpECState)
               +elemLen*sizeof(BNU_CHUNK_T)    /* EC coeff    A */
               +elemLen*sizeof(BNU_CHUNK_T)    /* EC coeff    B */
               +elemLen*sizeof(BNU_CHUNK_T)    /* generator G.x */
               +elemLen*sizeof(BNU_CHUNK_T)    /* generator G.y */
               +elemLen*sizeof(BNU_CHUNK_T)    /* generator G.z */
               +modEngineCtxSize               /* mont engine (R) */
               +elemLen*sizeof(BNU_CHUNK_T)    /* cofactor */
               #if defined(_LEGACY_ECCP_SUPPORT_)
               +2*elemLen*3*sizeof(BNU_CHUNK_T)    /* regular and ephemeral public  keys */
               +2*maxOrderLen*sizeof(BNU_CHUNK_T)  /* regular and ephemeral private keys */
               #endif
               +elemLen*sizeof(BNU_CHUNK_T)*3*EC_POOL_SIZE;
   }
   return ctxSize;
}