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/*
---------------------------------------------------------------------------
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);
int Gf64TabInit (unsigned __int8 *a, GfCtx *ctx);
void Gf64MulTab (unsigned char a[8], unsigned char p[8], GfCtx *ctx);
void MirrorBits128 (unsigned __int8 *a);
void MirrorBits64 (unsigned __int8 *a);
BOOL GfMulSelfTest ();
#if defined(__cplusplus)
}
#endif
#endif
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