| /* |
| --------------------------------------------------------------------------- |
| Copyright (c) 2002, 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 Date: 24/01/2003 |
| |
| This file contains the code for generating the fixed tables needed for AES |
| */ |
| |
| #include "aesopt.h" |
| |
| #if defined(__cplusplus) |
| extern "C" |
| { |
| #endif |
| |
| #if defined(FIXED_TABLES) || !defined(FF_TABLES) |
| |
| /* finite field arithmetic operations */ |
| |
| #define f2(x) ((x<<1) ^ (((x>>7) & 1) * WPOLY)) |
| #define f4(x) ((x<<2) ^ (((x>>6) & 1) * WPOLY) ^ (((x>>6) & 2) * WPOLY)) |
| #define f8(x) ((x<<3) ^ (((x>>5) & 1) * WPOLY) ^ (((x>>5) & 2) * WPOLY) \ |
| ^ (((x>>5) & 4) * WPOLY)) |
| #define f3(x) (f2(x) ^ x) |
| #define f9(x) (f8(x) ^ x) |
| #define fb(x) (f8(x) ^ f2(x) ^ x) |
| #define fd(x) (f8(x) ^ f4(x) ^ x) |
| #define fe(x) (f8(x) ^ f4(x) ^ f2(x)) |
| |
| #endif |
| |
| #if defined(FIXED_TABLES) |
| |
| #define sb_data(w) \ |
| w(0x63), w(0x7c), w(0x77), w(0x7b), w(0xf2), w(0x6b), w(0x6f), w(0xc5),\ |
| w(0x30), w(0x01), w(0x67), w(0x2b), w(0xfe), w(0xd7), w(0xab), w(0x76),\ |
| w(0xca), w(0x82), w(0xc9), w(0x7d), w(0xfa), w(0x59), w(0x47), w(0xf0),\ |
| w(0xad), w(0xd4), w(0xa2), w(0xaf), w(0x9c), w(0xa4), w(0x72), w(0xc0),\ |
| w(0xb7), w(0xfd), w(0x93), w(0x26), w(0x36), w(0x3f), w(0xf7), w(0xcc),\ |
| w(0x34), w(0xa5), w(0xe5), w(0xf1), w(0x71), w(0xd8), w(0x31), w(0x15),\ |
| w(0x04), w(0xc7), w(0x23), w(0xc3), w(0x18), w(0x96), w(0x05), w(0x9a),\ |
| w(0x07), w(0x12), w(0x80), w(0xe2), w(0xeb), w(0x27), w(0xb2), w(0x75),\ |
| w(0x09), w(0x83), w(0x2c), w(0x1a), w(0x1b), w(0x6e), w(0x5a), w(0xa0),\ |
| w(0x52), w(0x3b), w(0xd6), w(0xb3), w(0x29), w(0xe3), w(0x2f), w(0x84),\ |
| w(0x53), w(0xd1), w(0x00), w(0xed), w(0x20), w(0xfc), w(0xb1), w(0x5b),\ |
| w(0x6a), w(0xcb), w(0xbe), w(0x39), w(0x4a), w(0x4c), w(0x58), w(0xcf),\ |
| w(0xd0), w(0xef), w(0xaa), w(0xfb), w(0x43), w(0x4d), w(0x33), w(0x85),\ |
| w(0x45), w(0xf9), w(0x02), w(0x7f), w(0x50), w(0x3c), w(0x9f), w(0xa8),\ |
| w(0x51), w(0xa3), w(0x40), w(0x8f), w(0x92), w(0x9d), w(0x38), w(0xf5),\ |
| w(0xbc), w(0xb6), w(0xda), w(0x21), w(0x10), w(0xff), w(0xf3), w(0xd2),\ |
| w(0xcd), w(0x0c), w(0x13), w(0xec), w(0x5f), w(0x97), w(0x44), w(0x17),\ |
| w(0xc4), w(0xa7), w(0x7e), w(0x3d), w(0x64), w(0x5d), w(0x19), w(0x73),\ |
| w(0x60), w(0x81), w(0x4f), w(0xdc), w(0x22), w(0x2a), w(0x90), w(0x88),\ |
| w(0x46), w(0xee), w(0xb8), w(0x14), w(0xde), w(0x5e), w(0x0b), w(0xdb),\ |
| w(0xe0), w(0x32), w(0x3a), w(0x0a), w(0x49), w(0x06), w(0x24), w(0x5c),\ |
| w(0xc2), w(0xd3), w(0xac), w(0x62), w(0x91), w(0x95), w(0xe4), w(0x79),\ |
| w(0xe7), w(0xc8), w(0x37), w(0x6d), w(0x8d), w(0xd5), w(0x4e), w(0xa9),\ |
| w(0x6c), w(0x56), w(0xf4), w(0xea), w(0x65), w(0x7a), w(0xae), w(0x08),\ |
| w(0xba), w(0x78), w(0x25), w(0x2e), w(0x1c), w(0xa6), w(0xb4), w(0xc6),\ |
| w(0xe8), w(0xdd), w(0x74), w(0x1f), w(0x4b), w(0xbd), w(0x8b), w(0x8a),\ |
| w(0x70), w(0x3e), w(0xb5), w(0x66), w(0x48), w(0x03), w(0xf6), w(0x0e),\ |
| w(0x61), w(0x35), w(0x57), w(0xb9), w(0x86), w(0xc1), w(0x1d), w(0x9e),\ |
| w(0xe1), w(0xf8), w(0x98), w(0x11), w(0x69), w(0xd9), w(0x8e), w(0x94),\ |
| w(0x9b), w(0x1e), w(0x87), w(0xe9), w(0xce), w(0x55), w(0x28), w(0xdf),\ |
| w(0x8c), w(0xa1), w(0x89), w(0x0d), w(0xbf), w(0xe6), w(0x42), w(0x68),\ |
| w(0x41), w(0x99), w(0x2d), w(0x0f), w(0xb0), w(0x54), w(0xbb), w(0x16) |
| |
| #define isb_data(w) \ |
| w(0x52), w(0x09), w(0x6a), w(0xd5), w(0x30), w(0x36), w(0xa5), w(0x38),\ |
| w(0xbf), w(0x40), w(0xa3), w(0x9e), w(0x81), w(0xf3), w(0xd7), w(0xfb),\ |
| w(0x7c), w(0xe3), w(0x39), w(0x82), w(0x9b), w(0x2f), w(0xff), w(0x87),\ |
| w(0x34), w(0x8e), w(0x43), w(0x44), w(0xc4), w(0xde), w(0xe9), w(0xcb),\ |
| w(0x54), w(0x7b), w(0x94), w(0x32), w(0xa6), w(0xc2), w(0x23), w(0x3d),\ |
| w(0xee), w(0x4c), w(0x95), w(0x0b), w(0x42), w(0xfa), w(0xc3), w(0x4e),\ |
| w(0x08), w(0x2e), w(0xa1), w(0x66), w(0x28), w(0xd9), w(0x24), w(0xb2),\ |
| w(0x76), w(0x5b), w(0xa2), w(0x49), w(0x6d), w(0x8b), w(0xd1), w(0x25),\ |
| w(0x72), w(0xf8), w(0xf6), w(0x64), w(0x86), w(0x68), w(0x98), w(0x16),\ |
| w(0xd4), w(0xa4), w(0x5c), w(0xcc), w(0x5d), w(0x65), w(0xb6), w(0x92),\ |
| w(0x6c), w(0x70), w(0x48), w(0x50), w(0xfd), w(0xed), w(0xb9), w(0xda),\ |
| w(0x5e), w(0x15), w(0x46), w(0x57), w(0xa7), w(0x8d), w(0x9d), w(0x84),\ |
| w(0x90), w(0xd8), w(0xab), w(0x00), w(0x8c), w(0xbc), w(0xd3), w(0x0a),\ |
| w(0xf7), w(0xe4), w(0x58), w(0x05), w(0xb8), w(0xb3), w(0x45), w(0x06),\ |
| w(0xd0), w(0x2c), w(0x1e), w(0x8f), w(0xca), w(0x3f), w(0x0f), w(0x02),\ |
| w(0xc1), w(0xaf), w(0xbd), w(0x03), w(0x01), w(0x13), w(0x8a), w(0x6b),\ |
| w(0x3a), w(0x91), w(0x11), w(0x41), w(0x4f), w(0x67), w(0xdc), w(0xea),\ |
| w(0x97), w(0xf2), w(0xcf), w(0xce), w(0xf0), w(0xb4), w(0xe6), w(0x73),\ |
| w(0x96), w(0xac), w(0x74), w(0x22), w(0xe7), w(0xad), w(0x35), w(0x85),\ |
| w(0xe2), w(0xf9), w(0x37), w(0xe8), w(0x1c), w(0x75), w(0xdf), w(0x6e),\ |
| w(0x47), w(0xf1), w(0x1a), w(0x71), w(0x1d), w(0x29), w(0xc5), w(0x89),\ |
| w(0x6f), w(0xb7), w(0x62), w(0x0e), w(0xaa), w(0x18), w(0xbe), w(0x1b),\ |
| w(0xfc), w(0x56), w(0x3e), w(0x4b), w(0xc6), w(0xd2), w(0x79), w(0x20),\ |
| w(0x9a), w(0xdb), w(0xc0), w(0xfe), w(0x78), w(0xcd), w(0x5a), w(0xf4),\ |
| w(0x1f), w(0xdd), w(0xa8), w(0x33), w(0x88), w(0x07), w(0xc7), w(0x31),\ |
| w(0xb1), w(0x12), w(0x10), w(0x59), w(0x27), w(0x80), w(0xec), w(0x5f),\ |
| w(0x60), w(0x51), w(0x7f), w(0xa9), w(0x19), w(0xb5), w(0x4a), w(0x0d),\ |
| w(0x2d), w(0xe5), w(0x7a), w(0x9f), w(0x93), w(0xc9), w(0x9c), w(0xef),\ |
| w(0xa0), w(0xe0), w(0x3b), w(0x4d), w(0xae), w(0x2a), w(0xf5), w(0xb0),\ |
| w(0xc8), w(0xeb), w(0xbb), w(0x3c), w(0x83), w(0x53), w(0x99), w(0x61),\ |
| w(0x17), w(0x2b), w(0x04), w(0x7e), w(0xba), w(0x77), w(0xd6), w(0x26),\ |
| w(0xe1), w(0x69), w(0x14), w(0x63), w(0x55), w(0x21), w(0x0c), w(0x7d), |
| |
| #define mm_data(w) \ |
| w(0x00), w(0x01), w(0x02), w(0x03), w(0x04), w(0x05), w(0x06), w(0x07),\ |
| w(0x08), w(0x09), w(0x0a), w(0x0b), w(0x0c), w(0x0d), w(0x0e), w(0x0f),\ |
| w(0x10), w(0x11), w(0x12), w(0x13), w(0x14), w(0x15), w(0x16), w(0x17),\ |
| w(0x18), w(0x19), w(0x1a), w(0x1b), w(0x1c), w(0x1d), w(0x1e), w(0x1f),\ |
| w(0x20), w(0x21), w(0x22), w(0x23), w(0x24), w(0x25), w(0x26), w(0x27),\ |
| w(0x28), w(0x29), w(0x2a), w(0x2b), w(0x2c), w(0x2d), w(0x2e), w(0x2f),\ |
| w(0x30), w(0x31), w(0x32), w(0x33), w(0x34), w(0x35), w(0x36), w(0x37),\ |
| w(0x38), w(0x39), w(0x3a), w(0x3b), w(0x3c), w(0x3d), w(0x3e), w(0x3f),\ |
| w(0x40), w(0x41), w(0x42), w(0x43), w(0x44), w(0x45), w(0x46), w(0x47),\ |
| w(0x48), w(0x49), w(0x4a), w(0x4b), w(0x4c), w(0x4d), w(0x4e), w(0x4f),\ |
| w(0x50), w(0x51), w(0x52), w(0x53), w(0x54), w(0x55), w(0x56), w(0x57),\ |
| w(0x58), w(0x59), w(0x5a), w(0x5b), w(0x5c), w(0x5d), w(0x5e), w(0x5f),\ |
| w(0x60), w(0x61), w(0x62), w(0x63), w(0x64), w(0x65), w(0x66), w(0x67),\ |
| w(0x68), w(0x69), w(0x6a), w(0x6b), w(0x6c), w(0x6d), w(0x6e), w(0x6f),\ |
| w(0x70), w(0x71), w(0x72), w(0x73), w(0x74), w(0x75), w(0x76), w(0x77),\ |
| w(0x78), w(0x79), w(0x7a), w(0x7b), w(0x7c), w(0x7d), w(0x7e), w(0x7f),\ |
| w(0x80), w(0x81), w(0x82), w(0x83), w(0x84), w(0x85), w(0x86), w(0x87),\ |
| w(0x88), w(0x89), w(0x8a), w(0x8b), w(0x8c), w(0x8d), w(0x8e), w(0x8f),\ |
| w(0x90), w(0x91), w(0x92), w(0x93), w(0x94), w(0x95), w(0x96), w(0x97),\ |
| w(0x98), w(0x99), w(0x9a), w(0x9b), w(0x9c), w(0x9d), w(0x9e), w(0x9f),\ |
| w(0xa0), w(0xa1), w(0xa2), w(0xa3), w(0xa4), w(0xa5), w(0xa6), w(0xa7),\ |
| w(0xa8), w(0xa9), w(0xaa), w(0xab), w(0xac), w(0xad), w(0xae), w(0xaf),\ |
| w(0xb0), w(0xb1), w(0xb2), w(0xb3), w(0xb4), w(0xb5), w(0xb6), w(0xb7),\ |
| w(0xb8), w(0xb9), w(0xba), w(0xbb), w(0xbc), w(0xbd), w(0xbe), w(0xbf),\ |
| w(0xc0), w(0xc1), w(0xc2), w(0xc3), w(0xc4), w(0xc5), w(0xc6), w(0xc7),\ |
| w(0xc8), w(0xc9), w(0xca), w(0xcb), w(0xcc), w(0xcd), w(0xce), w(0xcf),\ |
| w(0xd0), w(0xd1), w(0xd2), w(0xd3), w(0xd4), w(0xd5), w(0xd6), w(0xd7),\ |
| w(0xd8), w(0xd9), w(0xda), w(0xdb), w(0xdc), w(0xdd), w(0xde), w(0xdf),\ |
| w(0xe0), w(0xe1), w(0xe2), w(0xe3), w(0xe4), w(0xe5), w(0xe6), w(0xe7),\ |
| w(0xe8), w(0xe9), w(0xea), w(0xeb), w(0xec), w(0xed), w(0xee), w(0xef),\ |
| w(0xf0), w(0xf1), w(0xf2), w(0xf3), w(0xf4), w(0xf5), w(0xf6), w(0xf7),\ |
| w(0xf8), w(0xf9), w(0xfa), w(0xfb), w(0xfc), w(0xfd), w(0xfe), w(0xff) |
| |
| #define h0(x) (x) |
| |
| /* These defines are used to ensure tables are generated in the |
| right format depending on the internal byte order required |
| */ |
| |
| #define w0(p) bytes2word(p, 0, 0, 0) |
| #define w1(p) bytes2word(0, p, 0, 0) |
| #define w2(p) bytes2word(0, 0, p, 0) |
| #define w3(p) bytes2word(0, 0, 0, p) |
| |
| /* Number of elements required in this table for different |
| block and key lengths is: |
| |
| Rcon Table key length (bytes) |
| Length 16 20 24 28 32 |
| --------------------- |
| block 16 | 10 9 8 7 7 |
| length 20 | 14 11 10 9 9 |
| (bytes) 24 | 19 15 12 11 11 |
| 28 | 24 19 16 13 13 |
| 32 | 29 23 19 17 14 |
| |
| this table can be a table of bytes if the key schedule |
| code is adjusted accordingly |
| */ |
| |
| #define u0(p) bytes2word(f2(p), p, p, f3(p)) |
| #define u1(p) bytes2word(f3(p), f2(p), p, p) |
| #define u2(p) bytes2word(p, f3(p), f2(p), p) |
| #define u3(p) bytes2word(p, p, f3(p), f2(p)) |
| |
| #define v0(p) bytes2word(fe(p), f9(p), fd(p), fb(p)) |
| #define v1(p) bytes2word(fb(p), fe(p), f9(p), fd(p)) |
| #define v2(p) bytes2word(fd(p), fb(p), fe(p), f9(p)) |
| #define v3(p) bytes2word(f9(p), fd(p), fb(p), fe(p)) |
| |
| INTERNAL const aes_32t t_dec(r,c)[RC_LENGTH] = |
| { |
| w0(0x01), w0(0x02), w0(0x04), w0(0x08), w0(0x10), |
| w0(0x20), w0(0x40), w0(0x80), w0(0x1b), w0(0x36), |
| #if RC_LENGTH > 10 |
| w0(0x6c), w0(0xd8), w0(0xab), w0(0x4d), |
| #endif |
| #if RC_LENGTH > 14 |
| w0(0x9a), w0(0x2f), w0(0x5e), w0(0xbc), w0(0x63), |
| #endif |
| #if RC_LENGTH > 19 |
| w0(0xc6), w0(0x97), w0(0x35), w0(0x6a), w0(0xd4), |
| #endif |
| #if RC_LENGTH > 24 |
| w0(0xb3), w0(0x7d), w0(0xfa), w0(0xef), w0(0xc5) |
| #endif |
| }; |
| |
| #ifdef SBX_SET |
| INTERNAL const aes_08t t_dec(s,box)[256] = { sb_data(h0) }; |
| #endif |
| #ifdef ISB_SET |
| INTERNAL const aes_08t t_dec(i,box)[256] = { isb_data(h0) }; |
| #endif |
| |
| #ifdef FT1_SET |
| INTERNAL const aes_32t t_dec(f,n)[256] = { sb_data(u0) }; |
| #endif |
| #ifdef FT4_SET |
| INTERNAL const aes_32t t_dec(f,n)[4][256] = |
| { { sb_data(u0) }, { sb_data(u1) }, { sb_data(u2) }, { sb_data(u3) } }; |
| #endif |
| |
| #ifdef FL1_SET |
| INTERNAL const aes_32t t_dec(f,l)[256] = { sb_data(w0) }; |
| #endif |
| #ifdef FL4_SET |
| INTERNAL const aes_32t t_dec(f,l)[4][256] = |
| { { sb_data(w0) }, { sb_data(w1) }, { sb_data(w2) }, { sb_data(w3) } }; |
| #endif |
| |
| #ifdef IT1_SET |
| INTERNAL const aes_32t t_dec(i,n)[256] = { isb_data(v0) }; |
| #endif |
| #ifdef IT4_SET |
| INTERNAL const aes_32t t_dec(i,n)[4][256] = |
| { { isb_data(v0) }, { isb_data(v1) }, { isb_data(v2) }, { isb_data(v3) } }; |
| #endif |
| |
| #ifdef IL1_SET |
| INTERNAL const aes_32t t_dec(i,l)[256] = { isb_data(w0) }; |
| #endif |
| #ifdef IL4_SET |
| INTERNAL const aes_32t t_dec(i,l)[4][256] = |
| { { isb_data(w0) }, { isb_data(w1) }, { isb_data(w2) }, { isb_data(w3) } }; |
| #endif |
| |
| #ifdef LS1_SET |
| INTERNAL const aes_32t t_dec(l,s)[256] = { sb_data(w0) }; |
| #endif |
| #ifdef LS4_SET |
| INTERNAL const aes_32t t_dec(l,s)[4][256] = |
| { { sb_data(w0) }, { sb_data(w1) }, { sb_data(w2) }, { sb_data(w3) } }; |
| #endif |
| |
| #ifdef IM1_SET |
| INTERNAL const aes_32t t_dec(i,m)[256] = { mm_data(v0) }; |
| #endif |
| #ifdef IM4_SET |
| INTERNAL const aes_32t t_dec(i,m)[4][256] = |
| { { mm_data(v0) }, { mm_data(v1) }, { mm_data(v2) }, { mm_data(v3) } }; |
| #endif |
| |
| #else /* dynamic table generation */ |
| |
| #ifdef GLOBALS |
| |
| aes_08t t_dec(in,it) = 0; |
| |
| aes_32t t_dec(r,c)[RC_LENGTH]; |
| |
| #ifdef SBX_SET |
| aes_08t t_dec(s,box)[256]; |
| #endif |
| #ifdef ISB_SET |
| aes_08t t_dec(i,box)[256]; |
| #endif |
| |
| #ifdef FT1_SET |
| aes_32t t_dec(f,n)[256]; |
| #endif |
| #ifdef FT4_SET |
| aes_32t t_dec(f,n)[4][256]; |
| #endif |
| |
| #ifdef FL1_SET |
| aes_32t t_dec(f,l)[256]; |
| #endif |
| #ifdef FL4_SET |
| aes_32t t_dec(f,l)[4][256]; |
| #endif |
| |
| #ifdef IT1_SET |
| aes_32t t_dec(i,n)[256]; |
| #endif |
| #ifdef IT4_SET |
| aes_32t t_dec(i,n)[4][256]; |
| #endif |
| |
| #ifdef IL1_SET |
| aes_32t t_dec(i,l)[256]; |
| #endif |
| #ifdef IL4_SET |
| aes_32t t_dec(i,l)[4][256]; |
| #endif |
| |
| #ifdef LS1_SET |
| aes_32t t_dec(l,s)[256]; |
| #endif |
| #ifdef LS4_SET |
| aes_32t t_dec(l,s)[4][256]; |
| #endif |
| |
| #ifdef IM1_SET |
| aes_32t t_dec(i,m)[256]; |
| #endif |
| #ifdef IM4_SET |
| aes_32t t_dec(i,m)[4][256]; |
| #endif |
| |
| #else |
| s_ty s_t; |
| #endif |
| |
| #if !defined(FF_TABLES) |
| |
| /* Generate the tables for the dynamic table option |
| |
| It will generally be sensible to use tables to compute finite |
| field multiplies and inverses but where memory is scarse this |
| code might sometimes be better. But it only has effect during |
| initialisation so its pretty unimportant in overall terms. |
| */ |
| |
| /* return 2 ^ (n - 1) where n is the bit number of the highest bit |
| set in x with x in the range 1 < x < 0x00000200. This form is |
| used so that locals within fi can be bytes rather than words |
| */ |
| |
| static aes_08t hibit(const aes_32t x) |
| { aes_08t r = (aes_08t)((x >> 1) | (x >> 2)); |
| |
| r |= (r >> 2); |
| r |= (r >> 4); |
| return (r + 1) >> 1; |
| } |
| |
| /* return the inverse of the finite field element x */ |
| |
| static aes_08t fi(const aes_08t x) |
| { aes_08t p1 = x, p2 = BPOLY, n1 = hibit(x), n2 = 0x80, v1 = 1, v2 = 0; |
| |
| if(x < 2) return x; |
| |
| for(;;) |
| { |
| if(!n1) return v1; |
| |
| while(n2 >= n1) |
| { |
| n2 /= n1; p2 ^= p1 * n2; v2 ^= v1 * n2; n2 = hibit(p2); |
| } |
| |
| if(!n2) return v2; |
| |
| while(n1 >= n2) |
| { |
| n1 /= n2; p1 ^= p2 * n1; v1 ^= v2 * n1; n1 = hibit(p1); |
| } |
| } |
| } |
| |
| #else |
| |
| /* define the finite field multiplies required for Rijndael */ |
| |
| #define f2(x) ((x) ? pow[log[x] + 0x19] : 0) |
| #define f3(x) ((x) ? pow[log[x] + 0x01] : 0) |
| #define f9(x) ((x) ? pow[log[x] + 0xc7] : 0) |
| #define fb(x) ((x) ? pow[log[x] + 0x68] : 0) |
| #define fd(x) ((x) ? pow[log[x] + 0xee] : 0) |
| #define fe(x) ((x) ? pow[log[x] + 0xdf] : 0) |
| #define fi(x) ((x) ? pow[255 - log[x]]: 0) |
| |
| #endif |
| |
| /* The forward and inverse affine transformations used in the S-box */ |
| |
| #define fwd_affine(x) \ |
| (w = (aes_32t)x, w ^= (w<<1)^(w<<2)^(w<<3)^(w<<4), 0x63^(aes_08t)(w^(w>>8))) |
| |
| #define inv_affine(x) \ |
| (w = (aes_32t)x, w = (w<<1)^(w<<3)^(w<<6), 0x05^(aes_08t)(w^(w>>8))) |
| |
| #ifdef GLOBALS |
| INTERNAL void gen_tabs(void) |
| #else |
| INTERNAL void gen_tabs(aes_ctx cx[1]) |
| #endif |
| { aes_32t i, w; |
| |
| #if defined(FF_TABLES) |
| |
| aes_08t pow[512], log[256]; |
| |
| /* log and power tables for GF(2^8) finite field with |
| WPOLY as modular polynomial - the simplest primitive |
| root is 0x03, used here to generate the tables |
| */ |
| |
| i = 0; w = 1; |
| do |
| { |
| pow[i] = (aes_08t)w; |
| pow[i + 255] = (aes_08t)w; |
| log[w] = (aes_08t)i++; |
| w ^= (w << 1) ^ (w & 0x80 ? WPOLY : 0); |
| } |
| while (w != 1); |
| |
| #endif |
| |
| #ifndef GLOBALS |
| if(!cx->t_ptr) |
| cx->t_ptr = &s_t; |
| #endif |
| |
| for(i = 0, w = 1; i < RC_LENGTH; ++i) |
| { |
| t_set(r,c)[i] = bytes2word(w, 0, 0, 0); |
| w = f2(w); |
| } |
| |
| for(i = 0; i < 256; ++i) |
| { aes_08t b; |
| |
| b = fwd_affine(fi((aes_08t)i)); |
| w = bytes2word(f2(b), b, b, f3(b)); |
| |
| #ifdef SBX_SET |
| t_set(s,box)[i] = b; |
| #endif |
| |
| #ifdef FT1_SET /* tables for a normal encryption round */ |
| t_set(f,n)[i] = w; |
| #endif |
| #ifdef FT4_SET |
| t_set(f,n)[0][i] = w; |
| t_set(f,n)[1][i] = upr(w,1); |
| t_set(f,n)[2][i] = upr(w,2); |
| t_set(f,n)[3][i] = upr(w,3); |
| #endif |
| w = bytes2word(b, 0, 0, 0); |
| |
| #ifdef FL1_SET /* tables for last encryption round (may also */ |
| t_set(f,l)[i] = w; /* be used in the key schedule) */ |
| #endif |
| #ifdef FL4_SET |
| t_set(f,l)[0][i] = w; |
| t_set(f,l)[1][i] = upr(w,1); |
| t_set(f,l)[2][i] = upr(w,2); |
| t_set(f,l)[3][i] = upr(w,3); |
| #endif |
| |
| #ifdef LS1_SET /* table for key schedule if t_set(f,l) above is */ |
| t_set(l,s)[i] = w; /* not of the required form */ |
| #endif |
| #ifdef LS4_SET |
| t_set(l,s)[0][i] = w; |
| t_set(l,s)[1][i] = upr(w,1); |
| t_set(l,s)[2][i] = upr(w,2); |
| t_set(l,s)[3][i] = upr(w,3); |
| #endif |
| |
| b = fi(inv_affine((aes_08t)i)); |
| w = bytes2word(fe(b), f9(b), fd(b), fb(b)); |
| |
| #ifdef IM1_SET /* tables for the inverse mix column operation */ |
| t_set(i,m)[b] = w; |
| #endif |
| #ifdef IM4_SET |
| t_set(i,m)[0][b] = w; |
| t_set(i,m)[1][b] = upr(w,1); |
| t_set(i,m)[2][b] = upr(w,2); |
| t_set(i,m)[3][b] = upr(w,3); |
| #endif |
| |
| #ifdef ISB_SET |
| t_set(i,box)[i] = b; |
| #endif |
| #ifdef IT1_SET /* tables for a normal decryption round */ |
| t_set(i,n)[i] = w; |
| #endif |
| #ifdef IT4_SET |
| t_set(i,n)[0][i] = w; |
| t_set(i,n)[1][i] = upr(w,1); |
| t_set(i,n)[2][i] = upr(w,2); |
| t_set(i,n)[3][i] = upr(w,3); |
| #endif |
| w = bytes2word(b, 0, 0, 0); |
| #ifdef IL1_SET /* tables for last decryption round */ |
| t_set(i,l)[i] = w; |
| #endif |
| #ifdef IL4_SET |
| t_set(i,l)[0][i] = w; |
| t_set(i,l)[1][i] = upr(w,1); |
| t_set(i,l)[2][i] = upr(w,2); |
| t_set(i,l)[3][i] = upr(w,3); |
| #endif |
| } |
| |
| t_set(in,it) = 1; |
| } |
| |
| #endif |
| |
| #if defined(__cplusplus) |
| } |
| #endif |
| |
