/*
 ---------------------------------------------------------------------------
 Copyright (c) 2003, Dr Brian Gladman, Worcester, UK.   All rights reserved.

 LICENSE TERMS

 The free distribution and use of this software is allowed (with or without
 changes) provided that:

  1. source code distributions include the above copyright notice, this
     list of conditions and the following disclaimer;

  2. binary distributions include the above copyright notice, this list
     of conditions and the following disclaimer in their documentation;

  3. the name of the copyright holder is not used to endorse products
     built using this software without specific written permission.

 DISCLAIMER

 This software is provided 'as is' with no explicit or implied warranties
 in respect of its properties, including, but not limited to, correctness
 and/or fitness for purpose.
 ---------------------------------------------------------------------------
 Issue Date: 31/01/2004
*/

/* Adapted for TrueCrypt */

#ifndef _GCM_H
#define _GCM_H

#include "Tcdefs.h"

#if defined(__cplusplus)
extern "C"
{
#endif

#define CBLK_LEN   16  /* encryption block length */
#define CBLK_LEN8  8

typedef struct
{
    unsigned __int32 gf_t8k[CBLK_LEN * 2][16][CBLK_LEN / 4];
} GfCtx8k;

typedef struct
{
		unsigned __int32 gf_t4k[CBLK_LEN8 * 2][16][CBLK_LEN / 4];
} GfCtx4k64;

typedef struct
{
	/* union not used to support faster mounting */
    unsigned __int32 gf_t128[CBLK_LEN * 2 / 2][16][CBLK_LEN / 4];
    unsigned __int32 gf_t64[CBLK_LEN8 * 2][16][CBLK_LEN8 / 4];
} GfCtx;

typedef int  ret_type;

void GfMul128 (void *a, const void* b);
void GfMul128Tab(unsigned char a[16], GfCtx8k *ctx);
int Gf128Tab64Init (unsigned __int8 *a, GfCtx *ctx);
void Gf128MulBy64Tab (unsigned __int8 a[8], unsigned __int8 p[16], GfCtx *ctx);
void MirrorBits128 (unsigned __int8 *a);
void MirrorBits64 (unsigned __int8 *a);
BOOL GfMulSelfTest ();

#if defined(__cplusplus)
}
#endif

#endif
