/* --------------------------------------------------------------------------- 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