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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 in both source and binary
form is allowed (with or without changes) provided that:
1. distributions of this source code include the above copyright
notice, this list of conditions and the following disclaimer;
2. distributions in binary form include the above copyright
notice, this list of conditions and the following disclaimer
in the documentation and/or other associated materials;
3. the copyright holder's name is not used to endorse products
built using this software without specific written permission.
ALTERNATIVELY, provided that this notice is retained in full, this product
may be distributed under the terms of the GNU General Public License (GPL),
in which case the provisions of the GPL apply INSTEAD OF those given above.
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 28/01/2004
This file contains the code for declaring the tables needed to implement
AES. The file aesopt.h is assumed to be included before this header file.
If there are no global variables, the definitions here can be used to put
the AES tables in a structure so that a pointer can then be added to the
AES context to pass them to the AES routines that need them. If this
facility is used, the calling program has to ensure that this pointer is
managed appropriately. In particular, the value of the t_dec(in,it) item
in the table structure must be set to zero in order to ensure that the
tables are initialised. In practice the three code sequences in aeskey.c
that control the calls to gen_tabs() and the gen_tabs() routine itself will
have to be changed for a specific implementation. If global variables are
available it will generally be preferable to use them with the precomputed
FIXED_TABLES option that uses static global tables.
The following defines can be used to control the way the tables
are defined, initialised and used in embedded environments that
require special features for these purposes
the 't_dec' construction is used to declare fixed table arrays
the 't_set' construction is used to set fixed table values
the 't_use' construction is used to access fixed table values
256 byte tables:
t_xxx(s,box) => forward S box
t_xxx(i,box) => inverse S box
256 32-bit word OR 4 x 256 32-bit word tables:
t_xxx(f,n) => forward normal round
t_xxx(f,l) => forward last round
t_xxx(i,n) => inverse normal round
t_xxx(i,l) => inverse last round
t_xxx(l,s) => key schedule table
t_xxx(i,m) => key schedule table
Other variables and tables:
t_xxx(r,c) => the rcon table
*/
#if !defined( _AESTAB_H )
#define _AESTAB_H
#define t_dec(m,n) t_##m##n
#define t_set(m,n) t_##m##n
#define t_use(m,n) t_##m##n
#if defined(FIXED_TABLES)
#define Const const
#else
#define Const
#endif
#if defined(DO_TABLES)
#define Extern
#else
#define Extern extern
#endif
#if defined(_MSC_VER) && defined(TABLE_ALIGN)
#define Align __declspec(align(TABLE_ALIGN))
#else
#define Align
#endif
#if defined(__cplusplus)
extern "C"
{
#endif
#if defined(DO_TABLES) && defined(FIXED_TABLES)
#define d_1(t,n,b,e) Align Const t n[256] = b(e)
#define d_4(t,n,b,e,f,g,h) Align Const t n[4][256] = { b(e), b(f), b(g), b(h) }
Extern Align Const aes_32t t_dec(r,c)[RC_LENGTH] = rc_data(w0);
#else
#define d_1(t,n,b,e) Extern Align Const t n[256]
#define d_4(t,n,b,e,f,g,h) Extern Align Const t n[4][256]
Extern Align Const aes_32t t_dec(r,c)[RC_LENGTH];
#endif
#if defined( SBX_SET )
d_1(aes_08t, t_dec(s,box), sb_data, h0);
#endif
#if defined( ISB_SET )
d_1(aes_08t, t_dec(i,box), isb_data, h0);
#endif
#if defined( FT1_SET )
d_1(aes_32t, t_dec(f,n), sb_data, u0);
#endif
#if defined( FT4_SET )
d_4(aes_32t, t_dec(f,n), sb_data, u0, u1, u2, u3);
#endif
#if defined( FL1_SET )
d_1(aes_32t, t_dec(f,l), sb_data, w0);
#endif
#if defined( FL4_SET )
d_4(aes_32t, t_dec(f,l), sb_data, w0, w1, w2, w3);
#endif
#if defined( IT1_SET )
d_1(aes_32t, t_dec(i,n), isb_data, v0);
#endif
#if defined( IT4_SET )
d_4(aes_32t, t_dec(i,n), isb_data, v0, v1, v2, v3);
#endif
#if defined( IL1_SET )
d_1(aes_32t, t_dec(i,l), isb_data, w0);
#endif
#if defined( IL4_SET )
d_4(aes_32t, t_dec(i,l), isb_data, w0, w1, w2, w3);
#endif
#if defined( LS1_SET )
#if defined( FL1_SET )
#undef LS1_SET
#else
d_1(aes_32t, t_dec(l,s), sb_data, w0);
#endif
#endif
#if defined( LS4_SET )
#if defined( FL4_SET )
#undef LS4_SET
#else
d_4(aes_32t, t_dec(l,s), sb_data, w0, w1, w2, w3);
#endif
#endif
#if defined( IM1_SET )
d_1(aes_32t, t_dec(i,m), mm_data, v0);
#endif
#if defined( IM4_SET )
d_4(aes_32t, t_dec(i,m), mm_data, v0, v1, v2, v3);
#endif
#if defined(__cplusplus)
}
#endif
#endif
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