Alexandre Lision | 7fd5d3d | 2013-12-04 13:06:40 -0500 | [diff] [blame] | 1 | /* |
| 2 | --------------------------------------------------------------------------- |
| 3 | Copyright (c) 1998-2010, Brian Gladman, Worcester, UK. All rights reserved. |
| 4 | |
| 5 | The redistribution and use of this software (with or without changes) |
| 6 | is allowed without the payment of fees or royalties provided that: |
| 7 | |
| 8 | source code distributions include the above copyright notice, this |
| 9 | list of conditions and the following disclaimer; |
| 10 | |
| 11 | binary distributions include the above copyright notice, this list |
| 12 | of conditions and the following disclaimer in their documentation. |
| 13 | |
| 14 | This software is provided 'as is' with no explicit or implied warranties |
| 15 | in respect of its operation, including, but not limited to, correctness |
| 16 | and fitness for purpose. |
| 17 | --------------------------------------------------------------------------- |
| 18 | Issue Date: 20/12/2007 |
| 19 | |
| 20 | This file contains the code for declaring the tables needed to implement |
| 21 | AES. The file aesopt.h is assumed to be included before this header file. |
| 22 | If there are no global variables, the definitions here can be used to put |
| 23 | the AES tables in a structure so that a pointer can then be added to the |
| 24 | AES context to pass them to the AES routines that need them. If this |
| 25 | facility is used, the calling program has to ensure that this pointer is |
| 26 | managed appropriately. In particular, the value of the t_dec(in,it) item |
| 27 | in the table structure must be set to zero in order to ensure that the |
| 28 | tables are initialised. In practice the three code sequences in aeskey.c |
| 29 | that control the calls to aes_init() and the aes_init() routine itself will |
| 30 | have to be changed for a specific implementation. If global variables are |
| 31 | available it will generally be preferable to use them with the precomputed |
| 32 | FIXED_TABLES option that uses static global tables. |
| 33 | |
| 34 | The following defines can be used to control the way the tables |
| 35 | are defined, initialised and used in embedded environments that |
| 36 | require special features for these purposes |
| 37 | |
| 38 | the 't_dec' construction is used to declare fixed table arrays |
| 39 | the 't_set' construction is used to set fixed table values |
| 40 | the 't_use' construction is used to access fixed table values |
| 41 | |
| 42 | 256 byte tables: |
| 43 | |
| 44 | t_xxx(s,box) => forward S box |
| 45 | t_xxx(i,box) => inverse S box |
| 46 | |
| 47 | 256 32-bit word OR 4 x 256 32-bit word tables: |
| 48 | |
| 49 | t_xxx(f,n) => forward normal round |
| 50 | t_xxx(f,l) => forward last round |
| 51 | t_xxx(i,n) => inverse normal round |
| 52 | t_xxx(i,l) => inverse last round |
| 53 | t_xxx(l,s) => key schedule table |
| 54 | t_xxx(i,m) => key schedule table |
| 55 | |
| 56 | Other variables and tables: |
| 57 | |
| 58 | t_xxx(r,c) => the rcon table |
| 59 | */ |
| 60 | |
| 61 | #if !defined( _AESTAB_H ) |
| 62 | #define _AESTAB_H |
| 63 | |
| 64 | #if defined(__cplusplus) |
| 65 | extern "C" { |
| 66 | #endif |
| 67 | |
| 68 | #define t_dec(m,n) t_##m##n |
| 69 | #define t_set(m,n) t_##m##n |
| 70 | #define t_use(m,n) t_##m##n |
| 71 | |
| 72 | #if defined(FIXED_TABLES) |
| 73 | # if !defined( __GNUC__ ) && (defined( __MSDOS__ ) || defined( __WIN16__ )) |
| 74 | /* make tables far data to avoid using too much DGROUP space (PG) */ |
| 75 | # define CONST const far |
| 76 | # else |
| 77 | # define CONST const |
| 78 | # endif |
| 79 | #else |
| 80 | # define CONST |
| 81 | #endif |
| 82 | |
| 83 | #if defined(DO_TABLES) |
| 84 | # define EXTERN |
| 85 | #else |
| 86 | # define EXTERN extern |
| 87 | #endif |
| 88 | |
| 89 | #if defined(_MSC_VER) && defined(TABLE_ALIGN) |
| 90 | #define ALIGN __declspec(align(TABLE_ALIGN)) |
| 91 | #else |
| 92 | #define ALIGN |
| 93 | #endif |
| 94 | |
| 95 | #if defined( __WATCOMC__ ) && ( __WATCOMC__ >= 1100 ) |
| 96 | # define XP_DIR __cdecl |
| 97 | #else |
| 98 | # define XP_DIR |
| 99 | #endif |
| 100 | |
| 101 | #if defined(DO_TABLES) && defined(FIXED_TABLES) |
| 102 | #define d_1(t,n,b,e) EXTERN ALIGN CONST XP_DIR t n[256] = b(e) |
| 103 | #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) } |
| 104 | EXTERN ALIGN CONST uint_32t t_dec(r,c)[RC_LENGTH] = rc_data(w0); |
| 105 | #else |
| 106 | #define d_1(t,n,b,e) EXTERN ALIGN CONST XP_DIR t n[256] |
| 107 | #define d_4(t,n,b,e,f,g,h) EXTERN ALIGN CONST XP_DIR t n[4][256] |
| 108 | EXTERN ALIGN CONST uint_32t t_dec(r,c)[RC_LENGTH]; |
| 109 | #endif |
| 110 | |
| 111 | #if defined( SBX_SET ) |
| 112 | d_1(uint_8t, t_dec(s,box), sb_data, h0); |
| 113 | #endif |
| 114 | #if defined( ISB_SET ) |
| 115 | d_1(uint_8t, t_dec(i,box), isb_data, h0); |
| 116 | #endif |
| 117 | |
| 118 | #if defined( FT1_SET ) |
| 119 | d_1(uint_32t, t_dec(f,n), sb_data, u0); |
| 120 | #endif |
| 121 | #if defined( FT4_SET ) |
| 122 | d_4(uint_32t, t_dec(f,n), sb_data, u0, u1, u2, u3); |
| 123 | #endif |
| 124 | |
| 125 | #if defined( FL1_SET ) |
| 126 | d_1(uint_32t, t_dec(f,l), sb_data, w0); |
| 127 | #endif |
| 128 | #if defined( FL4_SET ) |
| 129 | d_4(uint_32t, t_dec(f,l), sb_data, w0, w1, w2, w3); |
| 130 | #endif |
| 131 | |
| 132 | #if defined( IT1_SET ) |
| 133 | d_1(uint_32t, t_dec(i,n), isb_data, v0); |
| 134 | #endif |
| 135 | #if defined( IT4_SET ) |
| 136 | d_4(uint_32t, t_dec(i,n), isb_data, v0, v1, v2, v3); |
| 137 | #endif |
| 138 | |
| 139 | #if defined( IL1_SET ) |
| 140 | d_1(uint_32t, t_dec(i,l), isb_data, w0); |
| 141 | #endif |
| 142 | #if defined( IL4_SET ) |
| 143 | d_4(uint_32t, t_dec(i,l), isb_data, w0, w1, w2, w3); |
| 144 | #endif |
| 145 | |
| 146 | #if defined( LS1_SET ) |
| 147 | #if defined( FL1_SET ) |
| 148 | #undef LS1_SET |
| 149 | #else |
| 150 | d_1(uint_32t, t_dec(l,s), sb_data, w0); |
| 151 | #endif |
| 152 | #endif |
| 153 | |
| 154 | #if defined( LS4_SET ) |
| 155 | #if defined( FL4_SET ) |
| 156 | #undef LS4_SET |
| 157 | #else |
| 158 | d_4(uint_32t, t_dec(l,s), sb_data, w0, w1, w2, w3); |
| 159 | #endif |
| 160 | #endif |
| 161 | |
| 162 | #if defined( IM1_SET ) |
| 163 | d_1(uint_32t, t_dec(i,m), mm_data, v0); |
| 164 | #endif |
| 165 | #if defined( IM4_SET ) |
| 166 | d_4(uint_32t, t_dec(i,m), mm_data, v0, v1, v2, v3); |
| 167 | #endif |
| 168 | |
| 169 | #if defined(__cplusplus) |
| 170 | } |
| 171 | #endif |
| 172 | |
| 173 | #endif |