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

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

/*F*
// Name: gsModEngineGetSize
//
// Purpose: Specifies size of size of ModEngine context (Montgomery).
//
// Returns:                Reason:
//      ippStsLengthErr     modulusBitSize < 1
//                          numpe < MOD_ENGINE_MIN_POOL_SIZE
//      ippStsNoErr         no errors
//
// Parameters:
//      numpe           length of pool
//      modulusBitSize  max modulus length (in bits)
//      pSize           pointer to size
//
*F*/

IppStatus gsModEngineGetSize(int modulusBitSize, int numpe, int* pSize)
{
   int modLen  = BITS_BNU_CHUNK(modulusBitSize);
   int pelmLen = BITS_BNU_CHUNK(modulusBitSize);

   IPP_BADARG_RET(modulusBitSize<1, ippStsLengthErr);
   IPP_BADARG_RET(numpe<MOD_ENGINE_MIN_POOL_SIZE, ippStsLengthErr);

   /* allocates mimimal necessary to Montgomery based methods */
   *pSize = sizeof(gsModEngine)
           + modLen*sizeof(BNU_CHUNK_T)         /* modulus  */
           + modLen*sizeof(BNU_CHUNK_T)         /* mont_R   */
           + modLen*sizeof(BNU_CHUNK_T)         /* mont_R^2 */
           + pelmLen*sizeof(BNU_CHUNK_T)*numpe; /* buffers  */

   return ippStsNoErr;
}