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180 lines
5.4 KiB
180 lines
5.4 KiB
/*
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---------------------------------------------------------------------------
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Copyright (c) 1998-2008, Brian Gladman, Worcester, UK. All rights reserved.
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LICENSE TERMS
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The redistribution and use of this software (with or without changes)
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is allowed without the payment of fees or royalties provided that:
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1. source code distributions include the above copyright notice, this
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list of conditions and the following disclaimer;
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2. binary distributions include the above copyright notice, this list
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of conditions and the following disclaimer in their documentation;
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3. the name of the copyright holder is not used to endorse products
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built using this software without specific written permission.
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DISCLAIMER
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This software is provided 'as is' with no explicit or implied warranties
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in respect of its properties, including, but not limited to, correctness
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and/or fitness for purpose.
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---------------------------------------------------------------------------
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Issue Date: 20/12/2007
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This file contains the code for declaring the tables needed to implement
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AES. The file aesopt.h is assumed to be included before this header file.
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If there are no global variables, the definitions here can be used to put
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the AES tables in a structure so that a pointer can then be added to the
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AES context to pass them to the AES routines that need them. If this
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facility is used, the calling program has to ensure that this pointer is
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managed appropriately. In particular, the value of the t_dec(in,it) item
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in the table structure must be set to zero in order to ensure that the
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tables are initialised. In practice the three code sequences in aeskey.c
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that control the calls to aes_init() and the aes_init() routine itself will
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have to be changed for a specific implementation. If global variables are
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available it will generally be preferable to use them with the precomputed
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FIXED_TABLES option that uses static global tables.
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The following defines can be used to control the way the tables
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are defined, initialised and used in embedded environments that
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require special features for these purposes
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the 't_dec' construction is used to declare fixed table arrays
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the 't_set' construction is used to set fixed table values
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the 't_use' construction is used to access fixed table values
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256 byte tables:
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t_xxx(s,box) => forward S box
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t_xxx(i,box) => inverse S box
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256 32-bit word OR 4 x 256 32-bit word tables:
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t_xxx(f,n) => forward normal round
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t_xxx(f,l) => forward last round
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t_xxx(i,n) => inverse normal round
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t_xxx(i,l) => inverse last round
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t_xxx(l,s) => key schedule table
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t_xxx(i,m) => key schedule table
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Other variables and tables:
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t_xxx(r,c) => the rcon table
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*/
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#if !defined( _AESTAB_H )
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#define _AESTAB_H
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#if defined(__cplusplus)
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extern "C" {
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#endif
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#define t_dec(m,n) t_##m##n
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#define t_set(m,n) t_##m##n
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#define t_use(m,n) t_##m##n
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#if defined(FIXED_TABLES)
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# if !defined( __GNUC__ ) && (defined( __MSDOS__ ) || defined( __WIN16__ ))
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/* make tables far data to avoid using too much DGROUP space (PG) */
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# define CONST const far
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# else
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# define CONST const
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# endif
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#else
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# define CONST
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#endif
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#if defined(DO_TABLES)
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# define EXTERN
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#else
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# define EXTERN extern
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#endif
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#if defined(_MSC_VER) && defined(TABLE_ALIGN)
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#define ALIGN __declspec(align(TABLE_ALIGN))
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#else
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#define ALIGN
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#endif
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#if defined( __WATCOMC__ ) && ( __WATCOMC__ >= 1100 )
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# define XP_DIR __cdecl
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#else
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# define XP_DIR
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#endif
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#if defined(DO_TABLES) && defined(FIXED_TABLES)
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#define d_1(t,n,b,e) EXTERN ALIGN CONST XP_DIR t n[256] = b(e)
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#define d_4(t,n,b,e,f,g,h) EXTERN ALIGN CONST XP_DIR t n[4][256] = { b(e), b(f), b(g), b(h) }
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EXTERN ALIGN CONST uint_32t t_dec(r,c)[RC_LENGTH] = rc_data(w0);
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#else
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#define d_1(t,n,b,e) EXTERN ALIGN CONST XP_DIR t n[256]
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#define d_4(t,n,b,e,f,g,h) EXTERN ALIGN CONST XP_DIR t n[4][256]
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EXTERN ALIGN CONST uint_32t t_dec(r,c)[RC_LENGTH];
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#endif
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#if defined( SBX_SET )
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d_1(uint_8t, t_dec(s,box), sb_data, h0);
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#endif
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#if defined( ISB_SET )
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d_1(uint_8t, t_dec(i,box), isb_data, h0);
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#endif
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#if defined( FT1_SET )
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d_1(uint_32t, t_dec(f,n), sb_data, u0);
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#endif
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#if defined( FT4_SET )
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d_4(uint_32t, t_dec(f,n), sb_data, u0, u1, u2, u3);
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#endif
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#if defined( FL1_SET )
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d_1(uint_32t, t_dec(f,l), sb_data, w0);
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#endif
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#if defined( FL4_SET )
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d_4(uint_32t, t_dec(f,l), sb_data, w0, w1, w2, w3);
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#endif
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#if defined( IT1_SET )
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d_1(uint_32t, t_dec(i,n), isb_data, v0);
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#endif
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#if defined( IT4_SET )
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d_4(uint_32t, t_dec(i,n), isb_data, v0, v1, v2, v3);
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#endif
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#if defined( IL1_SET )
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d_1(uint_32t, t_dec(i,l), isb_data, w0);
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#endif
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#if defined( IL4_SET )
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d_4(uint_32t, t_dec(i,l), isb_data, w0, w1, w2, w3);
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#endif
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#if defined( LS1_SET )
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#if defined( FL1_SET )
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#undef LS1_SET
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#else
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d_1(uint_32t, t_dec(l,s), sb_data, w0);
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#endif
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#endif
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#if defined( LS4_SET )
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#if defined( FL4_SET )
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#undef LS4_SET
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#else
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d_4(uint_32t, t_dec(l,s), sb_data, w0, w1, w2, w3);
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#endif
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#endif
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#if defined( IM1_SET )
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d_1(uint_32t, t_dec(i,m), mm_data, v0);
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#endif
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#if defined( IM4_SET )
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d_4(uint_32t, t_dec(i,m), mm_data, v0, v1, v2, v3);
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#endif
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#if defined(__cplusplus)
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}
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#endif
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#endif
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