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418 lines
16 KiB
418 lines
16 KiB
/* |
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--------------------------------------------------------------------------- |
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Copyright (c) 1998-2013, Brian Gladman, Worcester, UK. All rights reserved. |
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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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source code distributions include the above copyright notice, this |
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list of conditions and the following disclaimer; |
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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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This software is provided 'as is' with no explicit or implied warranties |
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in respect of its operation, including, but not limited to, correctness |
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and fitness for purpose. |
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--------------------------------------------------------------------------- |
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Issue Date: 20/12/2007 |
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*/ |
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#define DO_TABLES |
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#include "aes.h" |
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#include "aesopt.h" |
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#if defined(STATIC_TABLES) |
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#define sb_data(w) {\ |
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w(0x63), w(0x7c), w(0x77), w(0x7b), w(0xf2), w(0x6b), w(0x6f), w(0xc5),\ |
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w(0x30), w(0x01), w(0x67), w(0x2b), w(0xfe), w(0xd7), w(0xab), w(0x76),\ |
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w(0xca), w(0x82), w(0xc9), w(0x7d), w(0xfa), w(0x59), w(0x47), w(0xf0),\ |
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w(0xad), w(0xd4), w(0xa2), w(0xaf), w(0x9c), w(0xa4), w(0x72), w(0xc0),\ |
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w(0xb7), w(0xfd), w(0x93), w(0x26), w(0x36), w(0x3f), w(0xf7), w(0xcc),\ |
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w(0x34), w(0xa5), w(0xe5), w(0xf1), w(0x71), w(0xd8), w(0x31), w(0x15),\ |
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w(0x04), w(0xc7), w(0x23), w(0xc3), w(0x18), w(0x96), w(0x05), w(0x9a),\ |
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w(0x07), w(0x12), w(0x80), w(0xe2), w(0xeb), w(0x27), w(0xb2), w(0x75),\ |
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w(0x09), w(0x83), w(0x2c), w(0x1a), w(0x1b), w(0x6e), w(0x5a), w(0xa0),\ |
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w(0x52), w(0x3b), w(0xd6), w(0xb3), w(0x29), w(0xe3), w(0x2f), w(0x84),\ |
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w(0x53), w(0xd1), w(0x00), w(0xed), w(0x20), w(0xfc), w(0xb1), w(0x5b),\ |
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w(0x6a), w(0xcb), w(0xbe), w(0x39), w(0x4a), w(0x4c), w(0x58), w(0xcf),\ |
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w(0xd0), w(0xef), w(0xaa), w(0xfb), w(0x43), w(0x4d), w(0x33), w(0x85),\ |
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w(0x45), w(0xf9), w(0x02), w(0x7f), w(0x50), w(0x3c), w(0x9f), w(0xa8),\ |
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w(0x51), w(0xa3), w(0x40), w(0x8f), w(0x92), w(0x9d), w(0x38), w(0xf5),\ |
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w(0xbc), w(0xb6), w(0xda), w(0x21), w(0x10), w(0xff), w(0xf3), w(0xd2),\ |
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w(0xcd), w(0x0c), w(0x13), w(0xec), w(0x5f), w(0x97), w(0x44), w(0x17),\ |
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w(0xc4), w(0xa7), w(0x7e), w(0x3d), w(0x64), w(0x5d), w(0x19), w(0x73),\ |
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w(0x60), w(0x81), w(0x4f), w(0xdc), w(0x22), w(0x2a), w(0x90), w(0x88),\ |
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w(0x46), w(0xee), w(0xb8), w(0x14), w(0xde), w(0x5e), w(0x0b), w(0xdb),\ |
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w(0xe0), w(0x32), w(0x3a), w(0x0a), w(0x49), w(0x06), w(0x24), w(0x5c),\ |
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w(0xc2), w(0xd3), w(0xac), w(0x62), w(0x91), w(0x95), w(0xe4), w(0x79),\ |
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w(0xe7), w(0xc8), w(0x37), w(0x6d), w(0x8d), w(0xd5), w(0x4e), w(0xa9),\ |
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w(0x6c), w(0x56), w(0xf4), w(0xea), w(0x65), w(0x7a), w(0xae), w(0x08),\ |
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w(0xba), w(0x78), w(0x25), w(0x2e), w(0x1c), w(0xa6), w(0xb4), w(0xc6),\ |
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w(0xe8), w(0xdd), w(0x74), w(0x1f), w(0x4b), w(0xbd), w(0x8b), w(0x8a),\ |
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w(0x70), w(0x3e), w(0xb5), w(0x66), w(0x48), w(0x03), w(0xf6), w(0x0e),\ |
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w(0x61), w(0x35), w(0x57), w(0xb9), w(0x86), w(0xc1), w(0x1d), w(0x9e),\ |
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w(0xe1), w(0xf8), w(0x98), w(0x11), w(0x69), w(0xd9), w(0x8e), w(0x94),\ |
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w(0x9b), w(0x1e), w(0x87), w(0xe9), w(0xce), w(0x55), w(0x28), w(0xdf),\ |
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w(0x8c), w(0xa1), w(0x89), w(0x0d), w(0xbf), w(0xe6), w(0x42), w(0x68),\ |
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w(0x41), w(0x99), w(0x2d), w(0x0f), w(0xb0), w(0x54), w(0xbb), w(0x16) } |
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#define isb_data(w) {\ |
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w(0x52), w(0x09), w(0x6a), w(0xd5), w(0x30), w(0x36), w(0xa5), w(0x38),\ |
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w(0xbf), w(0x40), w(0xa3), w(0x9e), w(0x81), w(0xf3), w(0xd7), w(0xfb),\ |
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w(0x7c), w(0xe3), w(0x39), w(0x82), w(0x9b), w(0x2f), w(0xff), w(0x87),\ |
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w(0x34), w(0x8e), w(0x43), w(0x44), w(0xc4), w(0xde), w(0xe9), w(0xcb),\ |
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w(0x54), w(0x7b), w(0x94), w(0x32), w(0xa6), w(0xc2), w(0x23), w(0x3d),\ |
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w(0xee), w(0x4c), w(0x95), w(0x0b), w(0x42), w(0xfa), w(0xc3), w(0x4e),\ |
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w(0x08), w(0x2e), w(0xa1), w(0x66), w(0x28), w(0xd9), w(0x24), w(0xb2),\ |
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w(0x76), w(0x5b), w(0xa2), w(0x49), w(0x6d), w(0x8b), w(0xd1), w(0x25),\ |
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w(0x72), w(0xf8), w(0xf6), w(0x64), w(0x86), w(0x68), w(0x98), w(0x16),\ |
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w(0xd4), w(0xa4), w(0x5c), w(0xcc), w(0x5d), w(0x65), w(0xb6), w(0x92),\ |
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w(0x6c), w(0x70), w(0x48), w(0x50), w(0xfd), w(0xed), w(0xb9), w(0xda),\ |
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w(0x5e), w(0x15), w(0x46), w(0x57), w(0xa7), w(0x8d), w(0x9d), w(0x84),\ |
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w(0x90), w(0xd8), w(0xab), w(0x00), w(0x8c), w(0xbc), w(0xd3), w(0x0a),\ |
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w(0xf7), w(0xe4), w(0x58), w(0x05), w(0xb8), w(0xb3), w(0x45), w(0x06),\ |
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w(0xd0), w(0x2c), w(0x1e), w(0x8f), w(0xca), w(0x3f), w(0x0f), w(0x02),\ |
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w(0xc1), w(0xaf), w(0xbd), w(0x03), w(0x01), w(0x13), w(0x8a), w(0x6b),\ |
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w(0x3a), w(0x91), w(0x11), w(0x41), w(0x4f), w(0x67), w(0xdc), w(0xea),\ |
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w(0x97), w(0xf2), w(0xcf), w(0xce), w(0xf0), w(0xb4), w(0xe6), w(0x73),\ |
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w(0x96), w(0xac), w(0x74), w(0x22), w(0xe7), w(0xad), w(0x35), w(0x85),\ |
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w(0xe2), w(0xf9), w(0x37), w(0xe8), w(0x1c), w(0x75), w(0xdf), w(0x6e),\ |
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w(0x47), w(0xf1), w(0x1a), w(0x71), w(0x1d), w(0x29), w(0xc5), w(0x89),\ |
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w(0x6f), w(0xb7), w(0x62), w(0x0e), w(0xaa), w(0x18), w(0xbe), w(0x1b),\ |
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w(0xfc), w(0x56), w(0x3e), w(0x4b), w(0xc6), w(0xd2), w(0x79), w(0x20),\ |
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w(0x9a), w(0xdb), w(0xc0), w(0xfe), w(0x78), w(0xcd), w(0x5a), w(0xf4),\ |
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w(0x1f), w(0xdd), w(0xa8), w(0x33), w(0x88), w(0x07), w(0xc7), w(0x31),\ |
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w(0xb1), w(0x12), w(0x10), w(0x59), w(0x27), w(0x80), w(0xec), w(0x5f),\ |
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w(0x60), w(0x51), w(0x7f), w(0xa9), w(0x19), w(0xb5), w(0x4a), w(0x0d),\ |
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w(0x2d), w(0xe5), w(0x7a), w(0x9f), w(0x93), w(0xc9), w(0x9c), w(0xef),\ |
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w(0xa0), w(0xe0), w(0x3b), w(0x4d), w(0xae), w(0x2a), w(0xf5), w(0xb0),\ |
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w(0xc8), w(0xeb), w(0xbb), w(0x3c), w(0x83), w(0x53), w(0x99), w(0x61),\ |
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w(0x17), w(0x2b), w(0x04), w(0x7e), w(0xba), w(0x77), w(0xd6), w(0x26),\ |
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w(0xe1), w(0x69), w(0x14), w(0x63), w(0x55), w(0x21), w(0x0c), w(0x7d) } |
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#define mm_data(w) {\ |
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w(0x00), w(0x01), w(0x02), w(0x03), w(0x04), w(0x05), w(0x06), w(0x07),\ |
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w(0x08), w(0x09), w(0x0a), w(0x0b), w(0x0c), w(0x0d), w(0x0e), w(0x0f),\ |
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w(0x10), w(0x11), w(0x12), w(0x13), w(0x14), w(0x15), w(0x16), w(0x17),\ |
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w(0x18), w(0x19), w(0x1a), w(0x1b), w(0x1c), w(0x1d), w(0x1e), w(0x1f),\ |
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w(0x20), w(0x21), w(0x22), w(0x23), w(0x24), w(0x25), w(0x26), w(0x27),\ |
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w(0x28), w(0x29), w(0x2a), w(0x2b), w(0x2c), w(0x2d), w(0x2e), w(0x2f),\ |
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w(0x30), w(0x31), w(0x32), w(0x33), w(0x34), w(0x35), w(0x36), w(0x37),\ |
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w(0x38), w(0x39), w(0x3a), w(0x3b), w(0x3c), w(0x3d), w(0x3e), w(0x3f),\ |
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w(0x40), w(0x41), w(0x42), w(0x43), w(0x44), w(0x45), w(0x46), w(0x47),\ |
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w(0x48), w(0x49), w(0x4a), w(0x4b), w(0x4c), w(0x4d), w(0x4e), w(0x4f),\ |
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w(0x50), w(0x51), w(0x52), w(0x53), w(0x54), w(0x55), w(0x56), w(0x57),\ |
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w(0x58), w(0x59), w(0x5a), w(0x5b), w(0x5c), w(0x5d), w(0x5e), w(0x5f),\ |
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w(0x60), w(0x61), w(0x62), w(0x63), w(0x64), w(0x65), w(0x66), w(0x67),\ |
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w(0x68), w(0x69), w(0x6a), w(0x6b), w(0x6c), w(0x6d), w(0x6e), w(0x6f),\ |
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w(0x70), w(0x71), w(0x72), w(0x73), w(0x74), w(0x75), w(0x76), w(0x77),\ |
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w(0x78), w(0x79), w(0x7a), w(0x7b), w(0x7c), w(0x7d), w(0x7e), w(0x7f),\ |
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w(0x80), w(0x81), w(0x82), w(0x83), w(0x84), w(0x85), w(0x86), w(0x87),\ |
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w(0x88), w(0x89), w(0x8a), w(0x8b), w(0x8c), w(0x8d), w(0x8e), w(0x8f),\ |
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w(0x90), w(0x91), w(0x92), w(0x93), w(0x94), w(0x95), w(0x96), w(0x97),\ |
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w(0x98), w(0x99), w(0x9a), w(0x9b), w(0x9c), w(0x9d), w(0x9e), w(0x9f),\ |
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w(0xa0), w(0xa1), w(0xa2), w(0xa3), w(0xa4), w(0xa5), w(0xa6), w(0xa7),\ |
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w(0xa8), w(0xa9), w(0xaa), w(0xab), w(0xac), w(0xad), w(0xae), w(0xaf),\ |
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w(0xb0), w(0xb1), w(0xb2), w(0xb3), w(0xb4), w(0xb5), w(0xb6), w(0xb7),\ |
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w(0xb8), w(0xb9), w(0xba), w(0xbb), w(0xbc), w(0xbd), w(0xbe), w(0xbf),\ |
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w(0xc0), w(0xc1), w(0xc2), w(0xc3), w(0xc4), w(0xc5), w(0xc6), w(0xc7),\ |
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w(0xc8), w(0xc9), w(0xca), w(0xcb), w(0xcc), w(0xcd), w(0xce), w(0xcf),\ |
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w(0xd0), w(0xd1), w(0xd2), w(0xd3), w(0xd4), w(0xd5), w(0xd6), w(0xd7),\ |
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w(0xd8), w(0xd9), w(0xda), w(0xdb), w(0xdc), w(0xdd), w(0xde), w(0xdf),\ |
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w(0xe0), w(0xe1), w(0xe2), w(0xe3), w(0xe4), w(0xe5), w(0xe6), w(0xe7),\ |
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w(0xe8), w(0xe9), w(0xea), w(0xeb), w(0xec), w(0xed), w(0xee), w(0xef),\ |
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w(0xf0), w(0xf1), w(0xf2), w(0xf3), w(0xf4), w(0xf5), w(0xf6), w(0xf7),\ |
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w(0xf8), w(0xf9), w(0xfa), w(0xfb), w(0xfc), w(0xfd), w(0xfe), w(0xff) } |
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#define rc_data(w) {\ |
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w(0x01), w(0x02), w(0x04), w(0x08), w(0x10),w(0x20), w(0x40), w(0x80),\ |
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w(0x1b), w(0x36) } |
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#define h0(x) (x) |
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#define w0(p) bytes2word(p, 0, 0, 0) |
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#define w1(p) bytes2word(0, p, 0, 0) |
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#define w2(p) bytes2word(0, 0, p, 0) |
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#define w3(p) bytes2word(0, 0, 0, p) |
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#define u0(p) bytes2word(f2(p), p, p, f3(p)) |
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#define u1(p) bytes2word(f3(p), f2(p), p, p) |
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#define u2(p) bytes2word(p, f3(p), f2(p), p) |
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#define u3(p) bytes2word(p, p, f3(p), f2(p)) |
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#define v0(p) bytes2word(fe(p), f9(p), fd(p), fb(p)) |
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#define v1(p) bytes2word(fb(p), fe(p), f9(p), fd(p)) |
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#define v2(p) bytes2word(fd(p), fb(p), fe(p), f9(p)) |
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#define v3(p) bytes2word(f9(p), fd(p), fb(p), fe(p)) |
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#endif |
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#if defined(STATIC_TABLES) || !defined(FF_TABLES) |
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#define f2(x) ((x<<1) ^ (((x>>7) & 1) * WPOLY)) |
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#define f4(x) ((x<<2) ^ (((x>>6) & 1) * WPOLY) ^ (((x>>6) & 2) * WPOLY)) |
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#define f8(x) ((x<<3) ^ (((x>>5) & 1) * WPOLY) ^ (((x>>5) & 2) * WPOLY) \ |
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^ (((x>>5) & 4) * WPOLY)) |
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#define f3(x) (f2(x) ^ x) |
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#define f9(x) (f8(x) ^ x) |
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#define fb(x) (f8(x) ^ f2(x) ^ x) |
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#define fd(x) (f8(x) ^ f4(x) ^ x) |
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#define fe(x) (f8(x) ^ f4(x) ^ f2(x)) |
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#else |
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#define f2(x) ((x) ? pow[log[x] + 0x19] : 0) |
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#define f3(x) ((x) ? pow[log[x] + 0x01] : 0) |
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#define f9(x) ((x) ? pow[log[x] + 0xc7] : 0) |
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#define fb(x) ((x) ? pow[log[x] + 0x68] : 0) |
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#define fd(x) ((x) ? pow[log[x] + 0xee] : 0) |
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#define fe(x) ((x) ? pow[log[x] + 0xdf] : 0) |
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#endif |
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#include "aestab.h" |
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#if defined(__cplusplus) |
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extern "C" |
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{ |
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#endif |
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#if defined(STATIC_TABLES) |
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/* implemented in case of wrong call for fixed tables */ |
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AES_RETURN aes_init(void) |
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{ |
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return EXIT_SUCCESS; |
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} |
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#else /* Generate the tables for the dynamic table option */ |
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#if defined(FF_TABLES) |
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#define gf_inv(x) ((x) ? pow[ 255 - log[x]] : 0) |
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#else |
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/* It will generally be sensible to use tables to compute finite |
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field multiplies and inverses but where memory is scarse this |
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code might sometimes be better. But it only has effect during |
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initialisation so its pretty unimportant in overall terms. |
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*/ |
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/* return 2 ^ (n - 1) where n is the bit number of the highest bit |
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set in x with x in the range 1 < x < 0x00000200. This form is |
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used so that locals within fi can be bytes rather than words |
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*/ |
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static uint8_t hibit(const uint32_t x) |
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{ uint8_t r = (uint8_t)((x >> 1) | (x >> 2)); |
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r |= (r >> 2); |
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r |= (r >> 4); |
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return (r + 1) >> 1; |
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} |
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/* return the inverse of the finite field element x */ |
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static uint8_t gf_inv(const uint8_t x) |
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{ uint8_t p1 = x, p2 = BPOLY, n1 = hibit(x), n2 = 0x80, v1 = 1, v2 = 0; |
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if(x < 2) |
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return x; |
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for( ; ; ) |
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{ |
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if(n1) |
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while(n2 >= n1) /* divide polynomial p2 by p1 */ |
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{ |
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n2 /= n1; /* shift smaller polynomial left */ |
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p2 ^= (p1 * n2) & 0xff; /* and remove from larger one */ |
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v2 ^= v1 * n2; /* shift accumulated value and */ |
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n2 = hibit(p2); /* add into result */ |
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} |
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else |
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return v1; |
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if(n2) /* repeat with values swapped */ |
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while(n1 >= n2) |
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{ |
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n1 /= n2; |
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p1 ^= p2 * n1; |
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v1 ^= v2 * n1; |
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n1 = hibit(p1); |
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} |
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else |
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return v2; |
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} |
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} |
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#endif |
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/* The forward and inverse affine transformations used in the S-box */ |
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uint8_t fwd_affine(const uint8_t x) |
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{ uint32_t w = x; |
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w ^= (w << 1) ^ (w << 2) ^ (w << 3) ^ (w << 4); |
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return 0x63 ^ ((w ^ (w >> 8)) & 0xff); |
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} |
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uint8_t inv_affine(const uint8_t x) |
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{ uint32_t w = x; |
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w = (w << 1) ^ (w << 3) ^ (w << 6); |
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return 0x05 ^ ((w ^ (w >> 8)) & 0xff); |
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} |
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static int init = 0; |
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AES_RETURN aes_init(void) |
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{ uint32_t i, w; |
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#if defined(FF_TABLES) |
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uint8_t pow[512], log[256]; |
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if(init) |
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return EXIT_SUCCESS; |
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/* 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] = (uint8_t)w; |
|
pow[i + 255] = (uint8_t)w; |
|
log[w] = (uint8_t)i++; |
|
w ^= (w << 1) ^ (w & 0x80 ? WPOLY : 0); |
|
} |
|
while (w != 1); |
|
|
|
#else |
|
if(init) |
|
return EXIT_SUCCESS; |
|
#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) |
|
{ uint8_t b; |
|
|
|
b = fwd_affine(gf_inv((uint8_t)i)); |
|
w = bytes2word(f2(b), b, b, f3(b)); |
|
|
|
#if defined( SBX_SET ) |
|
t_set(s,box)[i] = b; |
|
#endif |
|
|
|
#if defined( FT1_SET ) /* tables for a normal encryption round */ |
|
t_set(f,n)[i] = w; |
|
#endif |
|
#if defined( 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); |
|
|
|
#if defined( FL1_SET ) /* tables for last encryption round (may also */ |
|
t_set(f,l)[i] = w; /* be used in the key schedule) */ |
|
#endif |
|
#if defined( 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 |
|
|
|
#if defined( 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 |
|
#if defined( 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 = gf_inv(inv_affine((uint8_t)i)); |
|
w = bytes2word(fe(b), f9(b), fd(b), fb(b)); |
|
|
|
#if defined( IM1_SET ) /* tables for the inverse mix column operation */ |
|
t_set(i,m)[b] = w; |
|
#endif |
|
#if defined( 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 |
|
|
|
#if defined( ISB_SET ) |
|
t_set(i,box)[i] = b; |
|
#endif |
|
#if defined( IT1_SET ) /* tables for a normal decryption round */ |
|
t_set(i,n)[i] = w; |
|
#endif |
|
#if defined( 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); |
|
#if defined( IL1_SET ) /* tables for last decryption round */ |
|
t_set(i,l)[i] = w; |
|
#endif |
|
#if defined( 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 |
|
} |
|
init = 1; |
|
return EXIT_SUCCESS; |
|
} |
|
|
|
/* |
|
Automatic code initialisation (suggested by by Henrik S. Gaßmann) |
|
based on code provided by Joe Lowe and placed in the public domain at: |
|
http://stackoverflow.com/questions/1113409/attribute-constructor-equivalent-in-vc |
|
*/ |
|
|
|
#ifdef _MSC_VER |
|
|
|
#pragma section(".CRT$XCU", read) |
|
|
|
__declspec(allocate(".CRT$XCU")) void (__cdecl *aes_startup)(void) = aes_init; |
|
|
|
#elif defined(__GNUC__) |
|
|
|
static void aes_startup(void) __attribute__((constructor)); |
|
|
|
static void aes_startup(void) |
|
{ |
|
aes_init(); |
|
} |
|
|
|
#else |
|
|
|
#pragma message( "dynamic tables must be initialised manually on your system" ) |
|
|
|
#endif |
|
|
|
#endif |
|
|
|
#if defined(__cplusplus) |
|
} |
|
#endif |
|
|
|
|