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397 lines
16 KiB
397 lines
16 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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*/
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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(FIXED_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(FIXED_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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#define fi(x) ((x) ? pow[ 255 - log[x]] : 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(FIXED_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 /* dynamic table generation */
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#if !defined(FF_TABLES)
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/* Generate the tables for the dynamic table option
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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 uint_8t hibit(const uint_32t x)
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{ uint_8t r = (uint_8t)((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 uint_8t gf_inv(const uint_8t x)
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{ uint_8t 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)
|
|
{
|
|
n1 /= n2;
|
|
p1 ^= p2 * n1;
|
|
v1 ^= v2 * n1;
|
|
n1 = hibit(p1);
|
|
}
|
|
else
|
|
return v2;
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
/* The forward and inverse affine transformations used in the S-box */
|
|
uint_8t fwd_affine(const uint_8t x)
|
|
{ uint_32t w = x;
|
|
w ^= (w << 1) ^ (w << 2) ^ (w << 3) ^ (w << 4);
|
|
return 0x63 ^ ((w ^ (w >> 8)) & 0xff);
|
|
}
|
|
|
|
uint_8t inv_affine(const uint_8t x)
|
|
{ uint_32t w = x;
|
|
w = (w << 1) ^ (w << 3) ^ (w << 6);
|
|
return 0x05 ^ ((w ^ (w >> 8)) & 0xff);
|
|
}
|
|
|
|
static int init = 0;
|
|
|
|
AES_RETURN aes_init(void)
|
|
{ uint_32t i, w;
|
|
|
|
#if defined(FF_TABLES)
|
|
|
|
uint_8t pow[512], log[256];
|
|
|
|
if(init)
|
|
return EXIT_SUCCESS;
|
|
/* 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] = (uint_8t)w;
|
|
pow[i + 255] = (uint_8t)w;
|
|
log[w] = (uint_8t)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)
|
|
{ uint_8t b;
|
|
|
|
b = fwd_affine(gf_inv((uint_8t)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((uint_8t)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;
|
|
}
|
|
|
|
#endif
|
|
|
|
#if defined(__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
|