Balamurugan sanjeevirayar / Mbed 2 deprecated LoRAWANtest

LoRaWAN VIT

Dependencies:   mbed DigitDisplay Chainable_RGB_LED LoRaWAN-lib SX1276Lib

system/crypto/aes.cpp@0:cb80564f40e1, 2016-03-17 (annotated)

Committer:
mluis
Date:
Thu Mar 17 09:32:46 2016 +0000
Revision:
0:cb80564f40e1
Project creation based on LoRaWAN-demo-76

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mluis 0:cb80564f40e1 1 /*
mluis 0:cb80564f40e1 2 ---------------------------------------------------------------------------
mluis 0:cb80564f40e1 3 Copyright (c) 1998-2008, Brian Gladman, Worcester, UK. All rights reserved.
mluis 0:cb80564f40e1 4
mluis 0:cb80564f40e1 5 LICENSE TERMS
mluis 0:cb80564f40e1 6
mluis 0:cb80564f40e1 7 The redistribution and use of this software (with or without changes)
mluis 0:cb80564f40e1 8 is allowed without the payment of fees or royalties provided that:
mluis 0:cb80564f40e1 9
mluis 0:cb80564f40e1 10 1. source code distributions include the above copyright notice, this
mluis 0:cb80564f40e1 11 list of conditions and the following disclaimer;
mluis 0:cb80564f40e1 12
mluis 0:cb80564f40e1 13 2. binary distributions include the above copyright notice, this list
mluis 0:cb80564f40e1 14 of conditions and the following disclaimer in their documentation;
mluis 0:cb80564f40e1 15
mluis 0:cb80564f40e1 16 3. the name of the copyright holder is not used to endorse products
mluis 0:cb80564f40e1 17 built using this software without specific written permission.
mluis 0:cb80564f40e1 18
mluis 0:cb80564f40e1 19 DISCLAIMER
mluis 0:cb80564f40e1 20
mluis 0:cb80564f40e1 21 This software is provided 'as is' with no explicit or implied warranties
mluis 0:cb80564f40e1 22 in respect of its properties, including, but not limited to, correctness
mluis 0:cb80564f40e1 23 and/or fitness for purpose.
mluis 0:cb80564f40e1 24 ---------------------------------------------------------------------------
mluis 0:cb80564f40e1 25 Issue 09/09/2006
mluis 0:cb80564f40e1 26
mluis 0:cb80564f40e1 27 This is an AES implementation that uses only 8-bit byte operations on the
mluis 0:cb80564f40e1 28 cipher state (there are options to use 32-bit types if available).
mluis 0:cb80564f40e1 29
mluis 0:cb80564f40e1 30 The combination of mix columns and byte substitution used here is based on
mluis 0:cb80564f40e1 31 that developed by Karl Malbrain. His contribution is acknowledged.
mluis 0:cb80564f40e1 32 */
mluis 0:cb80564f40e1 33
mluis 0:cb80564f40e1 34 /* define if you have a fast memcpy function on your system */
mluis 0:cb80564f40e1 35 #if 0
mluis 0:cb80564f40e1 36 # define HAVE_MEMCPY
mluis 0:cb80564f40e1 37 # include <string.h>
mluis 0:cb80564f40e1 38 # if defined( _MSC_VER )
mluis 0:cb80564f40e1 39 # include <intrin.h>
mluis 0:cb80564f40e1 40 # pragma intrinsic( memcpy )
mluis 0:cb80564f40e1 41 # endif
mluis 0:cb80564f40e1 42 #endif
mluis 0:cb80564f40e1 43
mluis 0:cb80564f40e1 44
mluis 0:cb80564f40e1 45 #include <stdlib.h>
mluis 0:cb80564f40e1 46 #include <stdint.h>
mluis 0:cb80564f40e1 47
mluis 0:cb80564f40e1 48 /* define if you have fast 32-bit types on your system */
mluis 0:cb80564f40e1 49 #if 1
mluis 0:cb80564f40e1 50 # define HAVE_UINT_32T
mluis 0:cb80564f40e1 51 #endif
mluis 0:cb80564f40e1 52
mluis 0:cb80564f40e1 53 /* define if you don't want any tables */
mluis 0:cb80564f40e1 54 #if 1
mluis 0:cb80564f40e1 55 # define USE_TABLES
mluis 0:cb80564f40e1 56 #endif
mluis 0:cb80564f40e1 57
mluis 0:cb80564f40e1 58 /* On Intel Core 2 duo VERSION_1 is faster */
mluis 0:cb80564f40e1 59
mluis 0:cb80564f40e1 60 /* alternative versions (test for performance on your system) */
mluis 0:cb80564f40e1 61 #if 1
mluis 0:cb80564f40e1 62 # define VERSION_1
mluis 0:cb80564f40e1 63 #endif
mluis 0:cb80564f40e1 64
mluis 0:cb80564f40e1 65 #include "aes.h"
mluis 0:cb80564f40e1 66
mluis 0:cb80564f40e1 67 //#if defined( HAVE_UINT_32T )
mluis 0:cb80564f40e1 68 // typedef unsigned long uint32_t;
mluis 0:cb80564f40e1 69 //#endif
mluis 0:cb80564f40e1 70
mluis 0:cb80564f40e1 71 /* functions for finite field multiplication in the AES Galois field */
mluis 0:cb80564f40e1 72
mluis 0:cb80564f40e1 73 #define WPOLY 0x011b
mluis 0:cb80564f40e1 74 #define BPOLY 0x1b
mluis 0:cb80564f40e1 75 #define DPOLY 0x008d
mluis 0:cb80564f40e1 76
mluis 0:cb80564f40e1 77 #define f1(x) (x)
mluis 0:cb80564f40e1 78 #define f2(x) ((x << 1) ^ (((x >> 7) & 1) * WPOLY))
mluis 0:cb80564f40e1 79 #define f4(x) ((x << 2) ^ (((x >> 6) & 1) * WPOLY) ^ (((x >> 6) & 2) * WPOLY))
mluis 0:cb80564f40e1 80 #define f8(x) ((x << 3) ^ (((x >> 5) & 1) * WPOLY) ^ (((x >> 5) & 2) * WPOLY) \
mluis 0:cb80564f40e1 81 ^ (((x >> 5) & 4) * WPOLY))
mluis 0:cb80564f40e1 82 #define d2(x) (((x) >> 1) ^ ((x) & 1 ? DPOLY : 0))
mluis 0:cb80564f40e1 83
mluis 0:cb80564f40e1 84 #define f3(x) (f2(x) ^ x)
mluis 0:cb80564f40e1 85 #define f9(x) (f8(x) ^ x)
mluis 0:cb80564f40e1 86 #define fb(x) (f8(x) ^ f2(x) ^ x)
mluis 0:cb80564f40e1 87 #define fd(x) (f8(x) ^ f4(x) ^ x)
mluis 0:cb80564f40e1 88 #define fe(x) (f8(x) ^ f4(x) ^ f2(x))
mluis 0:cb80564f40e1 89
mluis 0:cb80564f40e1 90 #if defined( USE_TABLES )
mluis 0:cb80564f40e1 91
mluis 0:cb80564f40e1 92 #define sb_data(w) { /* S Box data values */ \
mluis 0:cb80564f40e1 93 w(0x63), w(0x7c), w(0x77), w(0x7b), w(0xf2), w(0x6b), w(0x6f), w(0xc5),\
mluis 0:cb80564f40e1 94 w(0x30), w(0x01), w(0x67), w(0x2b), w(0xfe), w(0xd7), w(0xab), w(0x76),\
mluis 0:cb80564f40e1 95 w(0xca), w(0x82), w(0xc9), w(0x7d), w(0xfa), w(0x59), w(0x47), w(0xf0),\
mluis 0:cb80564f40e1 96 w(0xad), w(0xd4), w(0xa2), w(0xaf), w(0x9c), w(0xa4), w(0x72), w(0xc0),\
mluis 0:cb80564f40e1 97 w(0xb7), w(0xfd), w(0x93), w(0x26), w(0x36), w(0x3f), w(0xf7), w(0xcc),\
mluis 0:cb80564f40e1 98 w(0x34), w(0xa5), w(0xe5), w(0xf1), w(0x71), w(0xd8), w(0x31), w(0x15),\
mluis 0:cb80564f40e1 99 w(0x04), w(0xc7), w(0x23), w(0xc3), w(0x18), w(0x96), w(0x05), w(0x9a),\
mluis 0:cb80564f40e1 100 w(0x07), w(0x12), w(0x80), w(0xe2), w(0xeb), w(0x27), w(0xb2), w(0x75),\
mluis 0:cb80564f40e1 101 w(0x09), w(0x83), w(0x2c), w(0x1a), w(0x1b), w(0x6e), w(0x5a), w(0xa0),\
mluis 0:cb80564f40e1 102 w(0x52), w(0x3b), w(0xd6), w(0xb3), w(0x29), w(0xe3), w(0x2f), w(0x84),\
mluis 0:cb80564f40e1 103 w(0x53), w(0xd1), w(0x00), w(0xed), w(0x20), w(0xfc), w(0xb1), w(0x5b),\
mluis 0:cb80564f40e1 104 w(0x6a), w(0xcb), w(0xbe), w(0x39), w(0x4a), w(0x4c), w(0x58), w(0xcf),\
mluis 0:cb80564f40e1 105 w(0xd0), w(0xef), w(0xaa), w(0xfb), w(0x43), w(0x4d), w(0x33), w(0x85),\
mluis 0:cb80564f40e1 106 w(0x45), w(0xf9), w(0x02), w(0x7f), w(0x50), w(0x3c), w(0x9f), w(0xa8),\
mluis 0:cb80564f40e1 107 w(0x51), w(0xa3), w(0x40), w(0x8f), w(0x92), w(0x9d), w(0x38), w(0xf5),\
mluis 0:cb80564f40e1 108 w(0xbc), w(0xb6), w(0xda), w(0x21), w(0x10), w(0xff), w(0xf3), w(0xd2),\
mluis 0:cb80564f40e1 109 w(0xcd), w(0x0c), w(0x13), w(0xec), w(0x5f), w(0x97), w(0x44), w(0x17),\
mluis 0:cb80564f40e1 110 w(0xc4), w(0xa7), w(0x7e), w(0x3d), w(0x64), w(0x5d), w(0x19), w(0x73),\
mluis 0:cb80564f40e1 111 w(0x60), w(0x81), w(0x4f), w(0xdc), w(0x22), w(0x2a), w(0x90), w(0x88),\
mluis 0:cb80564f40e1 112 w(0x46), w(0xee), w(0xb8), w(0x14), w(0xde), w(0x5e), w(0x0b), w(0xdb),\
mluis 0:cb80564f40e1 113 w(0xe0), w(0x32), w(0x3a), w(0x0a), w(0x49), w(0x06), w(0x24), w(0x5c),\
mluis 0:cb80564f40e1 114 w(0xc2), w(0xd3), w(0xac), w(0x62), w(0x91), w(0x95), w(0xe4), w(0x79),\
mluis 0:cb80564f40e1 115 w(0xe7), w(0xc8), w(0x37), w(0x6d), w(0x8d), w(0xd5), w(0x4e), w(0xa9),\
mluis 0:cb80564f40e1 116 w(0x6c), w(0x56), w(0xf4), w(0xea), w(0x65), w(0x7a), w(0xae), w(0x08),\
mluis 0:cb80564f40e1 117 w(0xba), w(0x78), w(0x25), w(0x2e), w(0x1c), w(0xa6), w(0xb4), w(0xc6),\
mluis 0:cb80564f40e1 118 w(0xe8), w(0xdd), w(0x74), w(0x1f), w(0x4b), w(0xbd), w(0x8b), w(0x8a),\
mluis 0:cb80564f40e1 119 w(0x70), w(0x3e), w(0xb5), w(0x66), w(0x48), w(0x03), w(0xf6), w(0x0e),\
mluis 0:cb80564f40e1 120 w(0x61), w(0x35), w(0x57), w(0xb9), w(0x86), w(0xc1), w(0x1d), w(0x9e),\
mluis 0:cb80564f40e1 121 w(0xe1), w(0xf8), w(0x98), w(0x11), w(0x69), w(0xd9), w(0x8e), w(0x94),\
mluis 0:cb80564f40e1 122 w(0x9b), w(0x1e), w(0x87), w(0xe9), w(0xce), w(0x55), w(0x28), w(0xdf),\
mluis 0:cb80564f40e1 123 w(0x8c), w(0xa1), w(0x89), w(0x0d), w(0xbf), w(0xe6), w(0x42), w(0x68),\
mluis 0:cb80564f40e1 124 w(0x41), w(0x99), w(0x2d), w(0x0f), w(0xb0), w(0x54), w(0xbb), w(0x16) }
mluis 0:cb80564f40e1 125
mluis 0:cb80564f40e1 126 #define isb_data(w) { /* inverse S Box data values */ \
mluis 0:cb80564f40e1 127 w(0x52), w(0x09), w(0x6a), w(0xd5), w(0x30), w(0x36), w(0xa5), w(0x38),\
mluis 0:cb80564f40e1 128 w(0xbf), w(0x40), w(0xa3), w(0x9e), w(0x81), w(0xf3), w(0xd7), w(0xfb),\
mluis 0:cb80564f40e1 129 w(0x7c), w(0xe3), w(0x39), w(0x82), w(0x9b), w(0x2f), w(0xff), w(0x87),\
mluis 0:cb80564f40e1 130 w(0x34), w(0x8e), w(0x43), w(0x44), w(0xc4), w(0xde), w(0xe9), w(0xcb),\
mluis 0:cb80564f40e1 131 w(0x54), w(0x7b), w(0x94), w(0x32), w(0xa6), w(0xc2), w(0x23), w(0x3d),\
mluis 0:cb80564f40e1 132 w(0xee), w(0x4c), w(0x95), w(0x0b), w(0x42), w(0xfa), w(0xc3), w(0x4e),\
mluis 0:cb80564f40e1 133 w(0x08), w(0x2e), w(0xa1), w(0x66), w(0x28), w(0xd9), w(0x24), w(0xb2),\
mluis 0:cb80564f40e1 134 w(0x76), w(0x5b), w(0xa2), w(0x49), w(0x6d), w(0x8b), w(0xd1), w(0x25),\
mluis 0:cb80564f40e1 135 w(0x72), w(0xf8), w(0xf6), w(0x64), w(0x86), w(0x68), w(0x98), w(0x16),\
mluis 0:cb80564f40e1 136 w(0xd4), w(0xa4), w(0x5c), w(0xcc), w(0x5d), w(0x65), w(0xb6), w(0x92),\
mluis 0:cb80564f40e1 137 w(0x6c), w(0x70), w(0x48), w(0x50), w(0xfd), w(0xed), w(0xb9), w(0xda),\
mluis 0:cb80564f40e1 138 w(0x5e), w(0x15), w(0x46), w(0x57), w(0xa7), w(0x8d), w(0x9d), w(0x84),\
mluis 0:cb80564f40e1 139 w(0x90), w(0xd8), w(0xab), w(0x00), w(0x8c), w(0xbc), w(0xd3), w(0x0a),\
mluis 0:cb80564f40e1 140 w(0xf7), w(0xe4), w(0x58), w(0x05), w(0xb8), w(0xb3), w(0x45), w(0x06),\
mluis 0:cb80564f40e1 141 w(0xd0), w(0x2c), w(0x1e), w(0x8f), w(0xca), w(0x3f), w(0x0f), w(0x02),\
mluis 0:cb80564f40e1 142 w(0xc1), w(0xaf), w(0xbd), w(0x03), w(0x01), w(0x13), w(0x8a), w(0x6b),\
mluis 0:cb80564f40e1 143 w(0x3a), w(0x91), w(0x11), w(0x41), w(0x4f), w(0x67), w(0xdc), w(0xea),\
mluis 0:cb80564f40e1 144 w(0x97), w(0xf2), w(0xcf), w(0xce), w(0xf0), w(0xb4), w(0xe6), w(0x73),\
mluis 0:cb80564f40e1 145 w(0x96), w(0xac), w(0x74), w(0x22), w(0xe7), w(0xad), w(0x35), w(0x85),\
mluis 0:cb80564f40e1 146 w(0xe2), w(0xf9), w(0x37), w(0xe8), w(0x1c), w(0x75), w(0xdf), w(0x6e),\
mluis 0:cb80564f40e1 147 w(0x47), w(0xf1), w(0x1a), w(0x71), w(0x1d), w(0x29), w(0xc5), w(0x89),\
mluis 0:cb80564f40e1 148 w(0x6f), w(0xb7), w(0x62), w(0x0e), w(0xaa), w(0x18), w(0xbe), w(0x1b),\
mluis 0:cb80564f40e1 149 w(0xfc), w(0x56), w(0x3e), w(0x4b), w(0xc6), w(0xd2), w(0x79), w(0x20),\
mluis 0:cb80564f40e1 150 w(0x9a), w(0xdb), w(0xc0), w(0xfe), w(0x78), w(0xcd), w(0x5a), w(0xf4),\
mluis 0:cb80564f40e1 151 w(0x1f), w(0xdd), w(0xa8), w(0x33), w(0x88), w(0x07), w(0xc7), w(0x31),\
mluis 0:cb80564f40e1 152 w(0xb1), w(0x12), w(0x10), w(0x59), w(0x27), w(0x80), w(0xec), w(0x5f),\
mluis 0:cb80564f40e1 153 w(0x60), w(0x51), w(0x7f), w(0xa9), w(0x19), w(0xb5), w(0x4a), w(0x0d),\
mluis 0:cb80564f40e1 154 w(0x2d), w(0xe5), w(0x7a), w(0x9f), w(0x93), w(0xc9), w(0x9c), w(0xef),\
mluis 0:cb80564f40e1 155 w(0xa0), w(0xe0), w(0x3b), w(0x4d), w(0xae), w(0x2a), w(0xf5), w(0xb0),\
mluis 0:cb80564f40e1 156 w(0xc8), w(0xeb), w(0xbb), w(0x3c), w(0x83), w(0x53), w(0x99), w(0x61),\
mluis 0:cb80564f40e1 157 w(0x17), w(0x2b), w(0x04), w(0x7e), w(0xba), w(0x77), w(0xd6), w(0x26),\
mluis 0:cb80564f40e1 158 w(0xe1), w(0x69), w(0x14), w(0x63), w(0x55), w(0x21), w(0x0c), w(0x7d) }
mluis 0:cb80564f40e1 159
mluis 0:cb80564f40e1 160 #define mm_data(w) { /* basic data for forming finite field tables */ \
mluis 0:cb80564f40e1 161 w(0x00), w(0x01), w(0x02), w(0x03), w(0x04), w(0x05), w(0x06), w(0x07),\
mluis 0:cb80564f40e1 162 w(0x08), w(0x09), w(0x0a), w(0x0b), w(0x0c), w(0x0d), w(0x0e), w(0x0f),\
mluis 0:cb80564f40e1 163 w(0x10), w(0x11), w(0x12), w(0x13), w(0x14), w(0x15), w(0x16), w(0x17),\
mluis 0:cb80564f40e1 164 w(0x18), w(0x19), w(0x1a), w(0x1b), w(0x1c), w(0x1d), w(0x1e), w(0x1f),\
mluis 0:cb80564f40e1 165 w(0x20), w(0x21), w(0x22), w(0x23), w(0x24), w(0x25), w(0x26), w(0x27),\
mluis 0:cb80564f40e1 166 w(0x28), w(0x29), w(0x2a), w(0x2b), w(0x2c), w(0x2d), w(0x2e), w(0x2f),\
mluis 0:cb80564f40e1 167 w(0x30), w(0x31), w(0x32), w(0x33), w(0x34), w(0x35), w(0x36), w(0x37),\
mluis 0:cb80564f40e1 168 w(0x38), w(0x39), w(0x3a), w(0x3b), w(0x3c), w(0x3d), w(0x3e), w(0x3f),\
mluis 0:cb80564f40e1 169 w(0x40), w(0x41), w(0x42), w(0x43), w(0x44), w(0x45), w(0x46), w(0x47),\
mluis 0:cb80564f40e1 170 w(0x48), w(0x49), w(0x4a), w(0x4b), w(0x4c), w(0x4d), w(0x4e), w(0x4f),\
mluis 0:cb80564f40e1 171 w(0x50), w(0x51), w(0x52), w(0x53), w(0x54), w(0x55), w(0x56), w(0x57),\
mluis 0:cb80564f40e1 172 w(0x58), w(0x59), w(0x5a), w(0x5b), w(0x5c), w(0x5d), w(0x5e), w(0x5f),\
mluis 0:cb80564f40e1 173 w(0x60), w(0x61), w(0x62), w(0x63), w(0x64), w(0x65), w(0x66), w(0x67),\
mluis 0:cb80564f40e1 174 w(0x68), w(0x69), w(0x6a), w(0x6b), w(0x6c), w(0x6d), w(0x6e), w(0x6f),\
mluis 0:cb80564f40e1 175 w(0x70), w(0x71), w(0x72), w(0x73), w(0x74), w(0x75), w(0x76), w(0x77),\
mluis 0:cb80564f40e1 176 w(0x78), w(0x79), w(0x7a), w(0x7b), w(0x7c), w(0x7d), w(0x7e), w(0x7f),\
mluis 0:cb80564f40e1 177 w(0x80), w(0x81), w(0x82), w(0x83), w(0x84), w(0x85), w(0x86), w(0x87),\
mluis 0:cb80564f40e1 178 w(0x88), w(0x89), w(0x8a), w(0x8b), w(0x8c), w(0x8d), w(0x8e), w(0x8f),\
mluis 0:cb80564f40e1 179 w(0x90), w(0x91), w(0x92), w(0x93), w(0x94), w(0x95), w(0x96), w(0x97),\
mluis 0:cb80564f40e1 180 w(0x98), w(0x99), w(0x9a), w(0x9b), w(0x9c), w(0x9d), w(0x9e), w(0x9f),\
mluis 0:cb80564f40e1 181 w(0xa0), w(0xa1), w(0xa2), w(0xa3), w(0xa4), w(0xa5), w(0xa6), w(0xa7),\
mluis 0:cb80564f40e1 182 w(0xa8), w(0xa9), w(0xaa), w(0xab), w(0xac), w(0xad), w(0xae), w(0xaf),\
mluis 0:cb80564f40e1 183 w(0xb0), w(0xb1), w(0xb2), w(0xb3), w(0xb4), w(0xb5), w(0xb6), w(0xb7),\
mluis 0:cb80564f40e1 184 w(0xb8), w(0xb9), w(0xba), w(0xbb), w(0xbc), w(0xbd), w(0xbe), w(0xbf),\
mluis 0:cb80564f40e1 185 w(0xc0), w(0xc1), w(0xc2), w(0xc3), w(0xc4), w(0xc5), w(0xc6), w(0xc7),\
mluis 0:cb80564f40e1 186 w(0xc8), w(0xc9), w(0xca), w(0xcb), w(0xcc), w(0xcd), w(0xce), w(0xcf),\
mluis 0:cb80564f40e1 187 w(0xd0), w(0xd1), w(0xd2), w(0xd3), w(0xd4), w(0xd5), w(0xd6), w(0xd7),\
mluis 0:cb80564f40e1 188 w(0xd8), w(0xd9), w(0xda), w(0xdb), w(0xdc), w(0xdd), w(0xde), w(0xdf),\
mluis 0:cb80564f40e1 189 w(0xe0), w(0xe1), w(0xe2), w(0xe3), w(0xe4), w(0xe5), w(0xe6), w(0xe7),\
mluis 0:cb80564f40e1 190 w(0xe8), w(0xe9), w(0xea), w(0xeb), w(0xec), w(0xed), w(0xee), w(0xef),\
mluis 0:cb80564f40e1 191 w(0xf0), w(0xf1), w(0xf2), w(0xf3), w(0xf4), w(0xf5), w(0xf6), w(0xf7),\
mluis 0:cb80564f40e1 192 w(0xf8), w(0xf9), w(0xfa), w(0xfb), w(0xfc), w(0xfd), w(0xfe), w(0xff) }
mluis 0:cb80564f40e1 193
mluis 0:cb80564f40e1 194 static const uint8_t sbox[256] = sb_data(f1);
mluis 0:cb80564f40e1 195
mluis 0:cb80564f40e1 196 #if defined( AES_DEC_PREKEYED )
mluis 0:cb80564f40e1 197 static const uint8_t isbox[256] = isb_data(f1);
mluis 0:cb80564f40e1 198 #endif
mluis 0:cb80564f40e1 199
mluis 0:cb80564f40e1 200 static const uint8_t gfm2_sbox[256] = sb_data(f2);
mluis 0:cb80564f40e1 201 static const uint8_t gfm3_sbox[256] = sb_data(f3);
mluis 0:cb80564f40e1 202
mluis 0:cb80564f40e1 203 #if defined( AES_DEC_PREKEYED )
mluis 0:cb80564f40e1 204 static const uint8_t gfmul_9[256] = mm_data(f9);
mluis 0:cb80564f40e1 205 static const uint8_t gfmul_b[256] = mm_data(fb);
mluis 0:cb80564f40e1 206 static const uint8_t gfmul_d[256] = mm_data(fd);
mluis 0:cb80564f40e1 207 static const uint8_t gfmul_e[256] = mm_data(fe);
mluis 0:cb80564f40e1 208 #endif
mluis 0:cb80564f40e1 209
mluis 0:cb80564f40e1 210 #define s_box(x) sbox[(x)]
mluis 0:cb80564f40e1 211 #if defined( AES_DEC_PREKEYED )
mluis 0:cb80564f40e1 212 #define is_box(x) isbox[(x)]
mluis 0:cb80564f40e1 213 #endif
mluis 0:cb80564f40e1 214 #define gfm2_sb(x) gfm2_sbox[(x)]
mluis 0:cb80564f40e1 215 #define gfm3_sb(x) gfm3_sbox[(x)]
mluis 0:cb80564f40e1 216 #if defined( AES_DEC_PREKEYED )
mluis 0:cb80564f40e1 217 #define gfm_9(x) gfmul_9[(x)]
mluis 0:cb80564f40e1 218 #define gfm_b(x) gfmul_b[(x)]
mluis 0:cb80564f40e1 219 #define gfm_d(x) gfmul_d[(x)]
mluis 0:cb80564f40e1 220 #define gfm_e(x) gfmul_e[(x)]
mluis 0:cb80564f40e1 221 #endif
mluis 0:cb80564f40e1 222 #else
mluis 0:cb80564f40e1 223
mluis 0:cb80564f40e1 224 /* this is the high bit of x right shifted by 1 */
mluis 0:cb80564f40e1 225 /* position. Since the starting polynomial has */
mluis 0:cb80564f40e1 226 /* 9 bits (0x11b), this right shift keeps the */
mluis 0:cb80564f40e1 227 /* values of all top bits within a byte */
mluis 0:cb80564f40e1 228
mluis 0:cb80564f40e1 229 static uint8_t hibit(const uint8_t x)
mluis 0:cb80564f40e1 230 { uint8_t r = (uint8_t)((x >> 1) | (x >> 2));
mluis 0:cb80564f40e1 231
mluis 0:cb80564f40e1 232 r |= (r >> 2);
mluis 0:cb80564f40e1 233 r |= (r >> 4);
mluis 0:cb80564f40e1 234 return (r + 1) >> 1;
mluis 0:cb80564f40e1 235 }
mluis 0:cb80564f40e1 236
mluis 0:cb80564f40e1 237 /* return the inverse of the finite field element x */
mluis 0:cb80564f40e1 238
mluis 0:cb80564f40e1 239 static uint8_t gf_inv(const uint8_t x)
mluis 0:cb80564f40e1 240 { uint8_t p1 = x, p2 = BPOLY, n1 = hibit(x), n2 = 0x80, v1 = 1, v2 = 0;
mluis 0:cb80564f40e1 241
mluis 0:cb80564f40e1 242 if(x < 2)
mluis 0:cb80564f40e1 243 return x;
mluis 0:cb80564f40e1 244
mluis 0:cb80564f40e1 245 for( ; ; )
mluis 0:cb80564f40e1 246 {
mluis 0:cb80564f40e1 247 if(n1)
mluis 0:cb80564f40e1 248 while(n2 >= n1) /* divide polynomial p2 by p1 */
mluis 0:cb80564f40e1 249 {
mluis 0:cb80564f40e1 250 n2 /= n1; /* shift smaller polynomial left */
mluis 0:cb80564f40e1 251 p2 ^= (p1 * n2) & 0xff; /* and remove from larger one */
mluis 0:cb80564f40e1 252 v2 ^= (v1 * n2); /* shift accumulated value and */
mluis 0:cb80564f40e1 253 n2 = hibit(p2); /* add into result */
mluis 0:cb80564f40e1 254 }
mluis 0:cb80564f40e1 255 else
mluis 0:cb80564f40e1 256 return v1;
mluis 0:cb80564f40e1 257
mluis 0:cb80564f40e1 258 if(n2) /* repeat with values swapped */
mluis 0:cb80564f40e1 259 while(n1 >= n2)
mluis 0:cb80564f40e1 260 {
mluis 0:cb80564f40e1 261 n1 /= n2;
mluis 0:cb80564f40e1 262 p1 ^= p2 * n1;
mluis 0:cb80564f40e1 263 v1 ^= v2 * n1;
mluis 0:cb80564f40e1 264 n1 = hibit(p1);
mluis 0:cb80564f40e1 265 }
mluis 0:cb80564f40e1 266 else
mluis 0:cb80564f40e1 267 return v2;
mluis 0:cb80564f40e1 268 }
mluis 0:cb80564f40e1 269 }
mluis 0:cb80564f40e1 270
mluis 0:cb80564f40e1 271 /* The forward and inverse affine transformations used in the S-box */
mluis 0:cb80564f40e1 272 uint8_t fwd_affine(const uint8_t x)
mluis 0:cb80564f40e1 273 {
mluis 0:cb80564f40e1 274 #if defined( HAVE_UINT_32T )
mluis 0:cb80564f40e1 275 uint32_t w = x;
mluis 0:cb80564f40e1 276 w ^= (w << 1) ^ (w << 2) ^ (w << 3) ^ (w << 4);
mluis 0:cb80564f40e1 277 return 0x63 ^ ((w ^ (w >> 8)) & 0xff);
mluis 0:cb80564f40e1 278 #else
mluis 0:cb80564f40e1 279 return 0x63 ^ x ^ (x << 1) ^ (x << 2) ^ (x << 3) ^ (x << 4)
mluis 0:cb80564f40e1 280 ^ (x >> 7) ^ (x >> 6) ^ (x >> 5) ^ (x >> 4);
mluis 0:cb80564f40e1 281 #endif
mluis 0:cb80564f40e1 282 }
mluis 0:cb80564f40e1 283
mluis 0:cb80564f40e1 284 uint8_t inv_affine(const uint8_t x)
mluis 0:cb80564f40e1 285 {
mluis 0:cb80564f40e1 286 #if defined( HAVE_UINT_32T )
mluis 0:cb80564f40e1 287 uint32_t w = x;
mluis 0:cb80564f40e1 288 w = (w << 1) ^ (w << 3) ^ (w << 6);
mluis 0:cb80564f40e1 289 return 0x05 ^ ((w ^ (w >> 8)) & 0xff);
mluis 0:cb80564f40e1 290 #else
mluis 0:cb80564f40e1 291 return 0x05 ^ (x << 1) ^ (x << 3) ^ (x << 6)
mluis 0:cb80564f40e1 292 ^ (x >> 7) ^ (x >> 5) ^ (x >> 2);
mluis 0:cb80564f40e1 293 #endif
mluis 0:cb80564f40e1 294 }
mluis 0:cb80564f40e1 295
mluis 0:cb80564f40e1 296 #define s_box(x) fwd_affine(gf_inv(x))
mluis 0:cb80564f40e1 297 #define is_box(x) gf_inv(inv_affine(x))
mluis 0:cb80564f40e1 298 #define gfm2_sb(x) f2(s_box(x))
mluis 0:cb80564f40e1 299 #define gfm3_sb(x) f3(s_box(x))
mluis 0:cb80564f40e1 300 #define gfm_9(x) f9(x)
mluis 0:cb80564f40e1 301 #define gfm_b(x) fb(x)
mluis 0:cb80564f40e1 302 #define gfm_d(x) fd(x)
mluis 0:cb80564f40e1 303 #define gfm_e(x) fe(x)
mluis 0:cb80564f40e1 304
mluis 0:cb80564f40e1 305 #endif
mluis 0:cb80564f40e1 306
mluis 0:cb80564f40e1 307 #if defined( HAVE_MEMCPY )
mluis 0:cb80564f40e1 308 # define block_copy_nn(d, s, l) memcpy(d, s, l)
mluis 0:cb80564f40e1 309 # define block_copy(d, s) memcpy(d, s, N_BLOCK)
mluis 0:cb80564f40e1 310 #else
mluis 0:cb80564f40e1 311 # define block_copy_nn(d, s, l) copy_block_nn(d, s, l)
mluis 0:cb80564f40e1 312 # define block_copy(d, s) copy_block(d, s)
mluis 0:cb80564f40e1 313 #endif
mluis 0:cb80564f40e1 314
mluis 0:cb80564f40e1 315 static void copy_block( void *d, const void *s )
mluis 0:cb80564f40e1 316 {
mluis 0:cb80564f40e1 317 #if defined( HAVE_UINT_32T )
mluis 0:cb80564f40e1 318 ((uint32_t*)d)[ 0] = ((uint32_t*)s)[ 0];
mluis 0:cb80564f40e1 319 ((uint32_t*)d)[ 1] = ((uint32_t*)s)[ 1];
mluis 0:cb80564f40e1 320 ((uint32_t*)d)[ 2] = ((uint32_t*)s)[ 2];
mluis 0:cb80564f40e1 321 ((uint32_t*)d)[ 3] = ((uint32_t*)s)[ 3];
mluis 0:cb80564f40e1 322 #else
mluis 0:cb80564f40e1 323 ((uint8_t*)d)[ 0] = ((uint8_t*)s)[ 0];
mluis 0:cb80564f40e1 324 ((uint8_t*)d)[ 1] = ((uint8_t*)s)[ 1];
mluis 0:cb80564f40e1 325 ((uint8_t*)d)[ 2] = ((uint8_t*)s)[ 2];
mluis 0:cb80564f40e1 326 ((uint8_t*)d)[ 3] = ((uint8_t*)s)[ 3];
mluis 0:cb80564f40e1 327 ((uint8_t*)d)[ 4] = ((uint8_t*)s)[ 4];
mluis 0:cb80564f40e1 328 ((uint8_t*)d)[ 5] = ((uint8_t*)s)[ 5];
mluis 0:cb80564f40e1 329 ((uint8_t*)d)[ 6] = ((uint8_t*)s)[ 6];
mluis 0:cb80564f40e1 330 ((uint8_t*)d)[ 7] = ((uint8_t*)s)[ 7];
mluis 0:cb80564f40e1 331 ((uint8_t*)d)[ 8] = ((uint8_t*)s)[ 8];
mluis 0:cb80564f40e1 332 ((uint8_t*)d)[ 9] = ((uint8_t*)s)[ 9];
mluis 0:cb80564f40e1 333 ((uint8_t*)d)[10] = ((uint8_t*)s)[10];
mluis 0:cb80564f40e1 334 ((uint8_t*)d)[11] = ((uint8_t*)s)[11];
mluis 0:cb80564f40e1 335 ((uint8_t*)d)[12] = ((uint8_t*)s)[12];
mluis 0:cb80564f40e1 336 ((uint8_t*)d)[13] = ((uint8_t*)s)[13];
mluis 0:cb80564f40e1 337 ((uint8_t*)d)[14] = ((uint8_t*)s)[14];
mluis 0:cb80564f40e1 338 ((uint8_t*)d)[15] = ((uint8_t*)s)[15];
mluis 0:cb80564f40e1 339 #endif
mluis 0:cb80564f40e1 340 }
mluis 0:cb80564f40e1 341
mluis 0:cb80564f40e1 342 static void copy_block_nn( uint8_t * d, const uint8_t *s, uint8_t nn )
mluis 0:cb80564f40e1 343 {
mluis 0:cb80564f40e1 344 while( nn-- )
mluis 0:cb80564f40e1 345 //*((uint8_t*)d)++ = *((uint8_t*)s)++;
mluis 0:cb80564f40e1 346 *d++ = *s++;
mluis 0:cb80564f40e1 347 }
mluis 0:cb80564f40e1 348
mluis 0:cb80564f40e1 349 static void xor_block( void *d, const void *s )
mluis 0:cb80564f40e1 350 {
mluis 0:cb80564f40e1 351 #if defined( HAVE_UINT_32T )
mluis 0:cb80564f40e1 352 ((uint32_t*)d)[ 0] ^= ((uint32_t*)s)[ 0];
mluis 0:cb80564f40e1 353 ((uint32_t*)d)[ 1] ^= ((uint32_t*)s)[ 1];
mluis 0:cb80564f40e1 354 ((uint32_t*)d)[ 2] ^= ((uint32_t*)s)[ 2];
mluis 0:cb80564f40e1 355 ((uint32_t*)d)[ 3] ^= ((uint32_t*)s)[ 3];
mluis 0:cb80564f40e1 356 #else
mluis 0:cb80564f40e1 357 ((uint8_t*)d)[ 0] ^= ((uint8_t*)s)[ 0];
mluis 0:cb80564f40e1 358 ((uint8_t*)d)[ 1] ^= ((uint8_t*)s)[ 1];
mluis 0:cb80564f40e1 359 ((uint8_t*)d)[ 2] ^= ((uint8_t*)s)[ 2];
mluis 0:cb80564f40e1 360 ((uint8_t*)d)[ 3] ^= ((uint8_t*)s)[ 3];
mluis 0:cb80564f40e1 361 ((uint8_t*)d)[ 4] ^= ((uint8_t*)s)[ 4];
mluis 0:cb80564f40e1 362 ((uint8_t*)d)[ 5] ^= ((uint8_t*)s)[ 5];
mluis 0:cb80564f40e1 363 ((uint8_t*)d)[ 6] ^= ((uint8_t*)s)[ 6];
mluis 0:cb80564f40e1 364 ((uint8_t*)d)[ 7] ^= ((uint8_t*)s)[ 7];
mluis 0:cb80564f40e1 365 ((uint8_t*)d)[ 8] ^= ((uint8_t*)s)[ 8];
mluis 0:cb80564f40e1 366 ((uint8_t*)d)[ 9] ^= ((uint8_t*)s)[ 9];
mluis 0:cb80564f40e1 367 ((uint8_t*)d)[10] ^= ((uint8_t*)s)[10];
mluis 0:cb80564f40e1 368 ((uint8_t*)d)[11] ^= ((uint8_t*)s)[11];
mluis 0:cb80564f40e1 369 ((uint8_t*)d)[12] ^= ((uint8_t*)s)[12];
mluis 0:cb80564f40e1 370 ((uint8_t*)d)[13] ^= ((uint8_t*)s)[13];
mluis 0:cb80564f40e1 371 ((uint8_t*)d)[14] ^= ((uint8_t*)s)[14];
mluis 0:cb80564f40e1 372 ((uint8_t*)d)[15] ^= ((uint8_t*)s)[15];
mluis 0:cb80564f40e1 373 #endif
mluis 0:cb80564f40e1 374 }
mluis 0:cb80564f40e1 375
mluis 0:cb80564f40e1 376 static void copy_and_key( void *d, const void *s, const void *k )
mluis 0:cb80564f40e1 377 {
mluis 0:cb80564f40e1 378 #if defined( HAVE_UINT_32T )
mluis 0:cb80564f40e1 379 ((uint32_t*)d)[ 0] = ((uint32_t*)s)[ 0] ^ ((uint32_t*)k)[ 0];
mluis 0:cb80564f40e1 380 ((uint32_t*)d)[ 1] = ((uint32_t*)s)[ 1] ^ ((uint32_t*)k)[ 1];
mluis 0:cb80564f40e1 381 ((uint32_t*)d)[ 2] = ((uint32_t*)s)[ 2] ^ ((uint32_t*)k)[ 2];
mluis 0:cb80564f40e1 382 ((uint32_t*)d)[ 3] = ((uint32_t*)s)[ 3] ^ ((uint32_t*)k)[ 3];
mluis 0:cb80564f40e1 383 #elif 1
mluis 0:cb80564f40e1 384 ((uint8_t*)d)[ 0] = ((uint8_t*)s)[ 0] ^ ((uint8_t*)k)[ 0];
mluis 0:cb80564f40e1 385 ((uint8_t*)d)[ 1] = ((uint8_t*)s)[ 1] ^ ((uint8_t*)k)[ 1];
mluis 0:cb80564f40e1 386 ((uint8_t*)d)[ 2] = ((uint8_t*)s)[ 2] ^ ((uint8_t*)k)[ 2];
mluis 0:cb80564f40e1 387 ((uint8_t*)d)[ 3] = ((uint8_t*)s)[ 3] ^ ((uint8_t*)k)[ 3];
mluis 0:cb80564f40e1 388 ((uint8_t*)d)[ 4] = ((uint8_t*)s)[ 4] ^ ((uint8_t*)k)[ 4];
mluis 0:cb80564f40e1 389 ((uint8_t*)d)[ 5] = ((uint8_t*)s)[ 5] ^ ((uint8_t*)k)[ 5];
mluis 0:cb80564f40e1 390 ((uint8_t*)d)[ 6] = ((uint8_t*)s)[ 6] ^ ((uint8_t*)k)[ 6];
mluis 0:cb80564f40e1 391 ((uint8_t*)d)[ 7] = ((uint8_t*)s)[ 7] ^ ((uint8_t*)k)[ 7];
mluis 0:cb80564f40e1 392 ((uint8_t*)d)[ 8] = ((uint8_t*)s)[ 8] ^ ((uint8_t*)k)[ 8];
mluis 0:cb80564f40e1 393 ((uint8_t*)d)[ 9] = ((uint8_t*)s)[ 9] ^ ((uint8_t*)k)[ 9];
mluis 0:cb80564f40e1 394 ((uint8_t*)d)[10] = ((uint8_t*)s)[10] ^ ((uint8_t*)k)[10];
mluis 0:cb80564f40e1 395 ((uint8_t*)d)[11] = ((uint8_t*)s)[11] ^ ((uint8_t*)k)[11];
mluis 0:cb80564f40e1 396 ((uint8_t*)d)[12] = ((uint8_t*)s)[12] ^ ((uint8_t*)k)[12];
mluis 0:cb80564f40e1 397 ((uint8_t*)d)[13] = ((uint8_t*)s)[13] ^ ((uint8_t*)k)[13];
mluis 0:cb80564f40e1 398 ((uint8_t*)d)[14] = ((uint8_t*)s)[14] ^ ((uint8_t*)k)[14];
mluis 0:cb80564f40e1 399 ((uint8_t*)d)[15] = ((uint8_t*)s)[15] ^ ((uint8_t*)k)[15];
mluis 0:cb80564f40e1 400 #else
mluis 0:cb80564f40e1 401 block_copy(d, s);
mluis 0:cb80564f40e1 402 xor_block(d, k);
mluis 0:cb80564f40e1 403 #endif
mluis 0:cb80564f40e1 404 }
mluis 0:cb80564f40e1 405
mluis 0:cb80564f40e1 406 static void add_round_key( uint8_t d[N_BLOCK], const uint8_t k[N_BLOCK] )
mluis 0:cb80564f40e1 407 {
mluis 0:cb80564f40e1 408 xor_block(d, k);
mluis 0:cb80564f40e1 409 }
mluis 0:cb80564f40e1 410
mluis 0:cb80564f40e1 411 static void shift_sub_rows( uint8_t st[N_BLOCK] )
mluis 0:cb80564f40e1 412 { uint8_t tt;
mluis 0:cb80564f40e1 413
mluis 0:cb80564f40e1 414 st[ 0] = s_box(st[ 0]); st[ 4] = s_box(st[ 4]);
mluis 0:cb80564f40e1 415 st[ 8] = s_box(st[ 8]); st[12] = s_box(st[12]);
mluis 0:cb80564f40e1 416
mluis 0:cb80564f40e1 417 tt = st[1]; st[ 1] = s_box(st[ 5]); st[ 5] = s_box(st[ 9]);
mluis 0:cb80564f40e1 418 st[ 9] = s_box(st[13]); st[13] = s_box( tt );
mluis 0:cb80564f40e1 419
mluis 0:cb80564f40e1 420 tt = st[2]; st[ 2] = s_box(st[10]); st[10] = s_box( tt );
mluis 0:cb80564f40e1 421 tt = st[6]; st[ 6] = s_box(st[14]); st[14] = s_box( tt );
mluis 0:cb80564f40e1 422
mluis 0:cb80564f40e1 423 tt = st[15]; st[15] = s_box(st[11]); st[11] = s_box(st[ 7]);
mluis 0:cb80564f40e1 424 st[ 7] = s_box(st[ 3]); st[ 3] = s_box( tt );
mluis 0:cb80564f40e1 425 }
mluis 0:cb80564f40e1 426
mluis 0:cb80564f40e1 427 #if defined( AES_DEC_PREKEYED )
mluis 0:cb80564f40e1 428
mluis 0:cb80564f40e1 429 static void inv_shift_sub_rows( uint8_t st[N_BLOCK] )
mluis 0:cb80564f40e1 430 { uint8_t tt;
mluis 0:cb80564f40e1 431
mluis 0:cb80564f40e1 432 st[ 0] = is_box(st[ 0]); st[ 4] = is_box(st[ 4]);
mluis 0:cb80564f40e1 433 st[ 8] = is_box(st[ 8]); st[12] = is_box(st[12]);
mluis 0:cb80564f40e1 434
mluis 0:cb80564f40e1 435 tt = st[13]; st[13] = is_box(st[9]); st[ 9] = is_box(st[5]);
mluis 0:cb80564f40e1 436 st[ 5] = is_box(st[1]); st[ 1] = is_box( tt );
mluis 0:cb80564f40e1 437
mluis 0:cb80564f40e1 438 tt = st[2]; st[ 2] = is_box(st[10]); st[10] = is_box( tt );
mluis 0:cb80564f40e1 439 tt = st[6]; st[ 6] = is_box(st[14]); st[14] = is_box( tt );
mluis 0:cb80564f40e1 440
mluis 0:cb80564f40e1 441 tt = st[3]; st[ 3] = is_box(st[ 7]); st[ 7] = is_box(st[11]);
mluis 0:cb80564f40e1 442 st[11] = is_box(st[15]); st[15] = is_box( tt );
mluis 0:cb80564f40e1 443 }
mluis 0:cb80564f40e1 444
mluis 0:cb80564f40e1 445 #endif
mluis 0:cb80564f40e1 446
mluis 0:cb80564f40e1 447 #if defined( VERSION_1 )
mluis 0:cb80564f40e1 448 static void mix_sub_columns( uint8_t dt[N_BLOCK] )
mluis 0:cb80564f40e1 449 { uint8_t st[N_BLOCK];
mluis 0:cb80564f40e1 450 block_copy(st, dt);
mluis 0:cb80564f40e1 451 #else
mluis 0:cb80564f40e1 452 static void mix_sub_columns( uint8_t dt[N_BLOCK], uint8_t st[N_BLOCK] )
mluis 0:cb80564f40e1 453 {
mluis 0:cb80564f40e1 454 #endif
mluis 0:cb80564f40e1 455 dt[ 0] = gfm2_sb(st[0]) ^ gfm3_sb(st[5]) ^ s_box(st[10]) ^ s_box(st[15]);
mluis 0:cb80564f40e1 456 dt[ 1] = s_box(st[0]) ^ gfm2_sb(st[5]) ^ gfm3_sb(st[10]) ^ s_box(st[15]);
mluis 0:cb80564f40e1 457 dt[ 2] = s_box(st[0]) ^ s_box(st[5]) ^ gfm2_sb(st[10]) ^ gfm3_sb(st[15]);
mluis 0:cb80564f40e1 458 dt[ 3] = gfm3_sb(st[0]) ^ s_box(st[5]) ^ s_box(st[10]) ^ gfm2_sb(st[15]);
mluis 0:cb80564f40e1 459
mluis 0:cb80564f40e1 460 dt[ 4] = gfm2_sb(st[4]) ^ gfm3_sb(st[9]) ^ s_box(st[14]) ^ s_box(st[3]);
mluis 0:cb80564f40e1 461 dt[ 5] = s_box(st[4]) ^ gfm2_sb(st[9]) ^ gfm3_sb(st[14]) ^ s_box(st[3]);
mluis 0:cb80564f40e1 462 dt[ 6] = s_box(st[4]) ^ s_box(st[9]) ^ gfm2_sb(st[14]) ^ gfm3_sb(st[3]);
mluis 0:cb80564f40e1 463 dt[ 7] = gfm3_sb(st[4]) ^ s_box(st[9]) ^ s_box(st[14]) ^ gfm2_sb(st[3]);
mluis 0:cb80564f40e1 464
mluis 0:cb80564f40e1 465 dt[ 8] = gfm2_sb(st[8]) ^ gfm3_sb(st[13]) ^ s_box(st[2]) ^ s_box(st[7]);
mluis 0:cb80564f40e1 466 dt[ 9] = s_box(st[8]) ^ gfm2_sb(st[13]) ^ gfm3_sb(st[2]) ^ s_box(st[7]);
mluis 0:cb80564f40e1 467 dt[10] = s_box(st[8]) ^ s_box(st[13]) ^ gfm2_sb(st[2]) ^ gfm3_sb(st[7]);
mluis 0:cb80564f40e1 468 dt[11] = gfm3_sb(st[8]) ^ s_box(st[13]) ^ s_box(st[2]) ^ gfm2_sb(st[7]);
mluis 0:cb80564f40e1 469
mluis 0:cb80564f40e1 470 dt[12] = gfm2_sb(st[12]) ^ gfm3_sb(st[1]) ^ s_box(st[6]) ^ s_box(st[11]);
mluis 0:cb80564f40e1 471 dt[13] = s_box(st[12]) ^ gfm2_sb(st[1]) ^ gfm3_sb(st[6]) ^ s_box(st[11]);
mluis 0:cb80564f40e1 472 dt[14] = s_box(st[12]) ^ s_box(st[1]) ^ gfm2_sb(st[6]) ^ gfm3_sb(st[11]);
mluis 0:cb80564f40e1 473 dt[15] = gfm3_sb(st[12]) ^ s_box(st[1]) ^ s_box(st[6]) ^ gfm2_sb(st[11]);
mluis 0:cb80564f40e1 474 }
mluis 0:cb80564f40e1 475
mluis 0:cb80564f40e1 476 #if defined( AES_DEC_PREKEYED )
mluis 0:cb80564f40e1 477
mluis 0:cb80564f40e1 478 #if defined( VERSION_1 )
mluis 0:cb80564f40e1 479 static void inv_mix_sub_columns( uint8_t dt[N_BLOCK] )
mluis 0:cb80564f40e1 480 { uint8_t st[N_BLOCK];
mluis 0:cb80564f40e1 481 block_copy(st, dt);
mluis 0:cb80564f40e1 482 #else
mluis 0:cb80564f40e1 483 static void inv_mix_sub_columns( uint8_t dt[N_BLOCK], uint8_t st[N_BLOCK] )
mluis 0:cb80564f40e1 484 {
mluis 0:cb80564f40e1 485 #endif
mluis 0:cb80564f40e1 486 dt[ 0] = is_box(gfm_e(st[ 0]) ^ gfm_b(st[ 1]) ^ gfm_d(st[ 2]) ^ gfm_9(st[ 3]));
mluis 0:cb80564f40e1 487 dt[ 5] = is_box(gfm_9(st[ 0]) ^ gfm_e(st[ 1]) ^ gfm_b(st[ 2]) ^ gfm_d(st[ 3]));
mluis 0:cb80564f40e1 488 dt[10] = is_box(gfm_d(st[ 0]) ^ gfm_9(st[ 1]) ^ gfm_e(st[ 2]) ^ gfm_b(st[ 3]));
mluis 0:cb80564f40e1 489 dt[15] = is_box(gfm_b(st[ 0]) ^ gfm_d(st[ 1]) ^ gfm_9(st[ 2]) ^ gfm_e(st[ 3]));
mluis 0:cb80564f40e1 490
mluis 0:cb80564f40e1 491 dt[ 4] = is_box(gfm_e(st[ 4]) ^ gfm_b(st[ 5]) ^ gfm_d(st[ 6]) ^ gfm_9(st[ 7]));
mluis 0:cb80564f40e1 492 dt[ 9] = is_box(gfm_9(st[ 4]) ^ gfm_e(st[ 5]) ^ gfm_b(st[ 6]) ^ gfm_d(st[ 7]));
mluis 0:cb80564f40e1 493 dt[14] = is_box(gfm_d(st[ 4]) ^ gfm_9(st[ 5]) ^ gfm_e(st[ 6]) ^ gfm_b(st[ 7]));
mluis 0:cb80564f40e1 494 dt[ 3] = is_box(gfm_b(st[ 4]) ^ gfm_d(st[ 5]) ^ gfm_9(st[ 6]) ^ gfm_e(st[ 7]));
mluis 0:cb80564f40e1 495
mluis 0:cb80564f40e1 496 dt[ 8] = is_box(gfm_e(st[ 8]) ^ gfm_b(st[ 9]) ^ gfm_d(st[10]) ^ gfm_9(st[11]));
mluis 0:cb80564f40e1 497 dt[13] = is_box(gfm_9(st[ 8]) ^ gfm_e(st[ 9]) ^ gfm_b(st[10]) ^ gfm_d(st[11]));
mluis 0:cb80564f40e1 498 dt[ 2] = is_box(gfm_d(st[ 8]) ^ gfm_9(st[ 9]) ^ gfm_e(st[10]) ^ gfm_b(st[11]));
mluis 0:cb80564f40e1 499 dt[ 7] = is_box(gfm_b(st[ 8]) ^ gfm_d(st[ 9]) ^ gfm_9(st[10]) ^ gfm_e(st[11]));
mluis 0:cb80564f40e1 500
mluis 0:cb80564f40e1 501 dt[12] = is_box(gfm_e(st[12]) ^ gfm_b(st[13]) ^ gfm_d(st[14]) ^ gfm_9(st[15]));
mluis 0:cb80564f40e1 502 dt[ 1] = is_box(gfm_9(st[12]) ^ gfm_e(st[13]) ^ gfm_b(st[14]) ^ gfm_d(st[15]));
mluis 0:cb80564f40e1 503 dt[ 6] = is_box(gfm_d(st[12]) ^ gfm_9(st[13]) ^ gfm_e(st[14]) ^ gfm_b(st[15]));
mluis 0:cb80564f40e1 504 dt[11] = is_box(gfm_b(st[12]) ^ gfm_d(st[13]) ^ gfm_9(st[14]) ^ gfm_e(st[15]));
mluis 0:cb80564f40e1 505 }
mluis 0:cb80564f40e1 506
mluis 0:cb80564f40e1 507 #endif
mluis 0:cb80564f40e1 508
mluis 0:cb80564f40e1 509 #if defined( AES_ENC_PREKEYED ) || defined( AES_DEC_PREKEYED )
mluis 0:cb80564f40e1 510
mluis 0:cb80564f40e1 511 /* Set the cipher key for the pre-keyed version */
mluis 0:cb80564f40e1 512
mluis 0:cb80564f40e1 513 return_type aes_set_key( const uint8_t key[], length_type keylen, aes_context ctx[1] )
mluis 0:cb80564f40e1 514 {
mluis 0:cb80564f40e1 515 uint8_t cc, rc, hi;
mluis 0:cb80564f40e1 516
mluis 0:cb80564f40e1 517 switch( keylen )
mluis 0:cb80564f40e1 518 {
mluis 0:cb80564f40e1 519 case 16:
mluis 0:cb80564f40e1 520 case 24:
mluis 0:cb80564f40e1 521 case 32:
mluis 0:cb80564f40e1 522 break;
mluis 0:cb80564f40e1 523 default:
mluis 0:cb80564f40e1 524 ctx->rnd = 0;
mluis 0:cb80564f40e1 525 return ( uint8_t )-1;
mluis 0:cb80564f40e1 526 }
mluis 0:cb80564f40e1 527 block_copy_nn(ctx->ksch, key, keylen);
mluis 0:cb80564f40e1 528 hi = (keylen + 28) << 2;
mluis 0:cb80564f40e1 529 ctx->rnd = (hi >> 4) - 1;
mluis 0:cb80564f40e1 530 for( cc = keylen, rc = 1; cc < hi; cc += 4 )
mluis 0:cb80564f40e1 531 { uint8_t tt, t0, t1, t2, t3;
mluis 0:cb80564f40e1 532
mluis 0:cb80564f40e1 533 t0 = ctx->ksch[cc - 4];
mluis 0:cb80564f40e1 534 t1 = ctx->ksch[cc - 3];
mluis 0:cb80564f40e1 535 t2 = ctx->ksch[cc - 2];
mluis 0:cb80564f40e1 536 t3 = ctx->ksch[cc - 1];
mluis 0:cb80564f40e1 537 if( cc % keylen == 0 )
mluis 0:cb80564f40e1 538 {
mluis 0:cb80564f40e1 539 tt = t0;
mluis 0:cb80564f40e1 540 t0 = s_box(t1) ^ rc;
mluis 0:cb80564f40e1 541 t1 = s_box(t2);
mluis 0:cb80564f40e1 542 t2 = s_box(t3);
mluis 0:cb80564f40e1 543 t3 = s_box(tt);
mluis 0:cb80564f40e1 544 rc = f2(rc);
mluis 0:cb80564f40e1 545 }
mluis 0:cb80564f40e1 546 else if( keylen > 24 && cc % keylen == 16 )
mluis 0:cb80564f40e1 547 {
mluis 0:cb80564f40e1 548 t0 = s_box(t0);
mluis 0:cb80564f40e1 549 t1 = s_box(t1);
mluis 0:cb80564f40e1 550 t2 = s_box(t2);
mluis 0:cb80564f40e1 551 t3 = s_box(t3);
mluis 0:cb80564f40e1 552 }
mluis 0:cb80564f40e1 553 tt = cc - keylen;
mluis 0:cb80564f40e1 554 ctx->ksch[cc + 0] = ctx->ksch[tt + 0] ^ t0;
mluis 0:cb80564f40e1 555 ctx->ksch[cc + 1] = ctx->ksch[tt + 1] ^ t1;
mluis 0:cb80564f40e1 556 ctx->ksch[cc + 2] = ctx->ksch[tt + 2] ^ t2;
mluis 0:cb80564f40e1 557 ctx->ksch[cc + 3] = ctx->ksch[tt + 3] ^ t3;
mluis 0:cb80564f40e1 558 }
mluis 0:cb80564f40e1 559 return 0;
mluis 0:cb80564f40e1 560 }
mluis 0:cb80564f40e1 561
mluis 0:cb80564f40e1 562 #endif
mluis 0:cb80564f40e1 563
mluis 0:cb80564f40e1 564 #if defined( AES_ENC_PREKEYED )
mluis 0:cb80564f40e1 565
mluis 0:cb80564f40e1 566 /* Encrypt a single block of 16 bytes */
mluis 0:cb80564f40e1 567
mluis 0:cb80564f40e1 568 return_type aes_encrypt( const uint8_t in[N_BLOCK], uint8_t out[N_BLOCK], const aes_context ctx[1] )
mluis 0:cb80564f40e1 569 {
mluis 0:cb80564f40e1 570 if( ctx->rnd )
mluis 0:cb80564f40e1 571 {
mluis 0:cb80564f40e1 572 uint8_t s1[N_BLOCK], r;
mluis 0:cb80564f40e1 573 copy_and_key( s1, in, ctx->ksch );
mluis 0:cb80564f40e1 574
mluis 0:cb80564f40e1 575 for( r = 1 ; r < ctx->rnd ; ++r )
mluis 0:cb80564f40e1 576 #if defined( VERSION_1 )
mluis 0:cb80564f40e1 577 {
mluis 0:cb80564f40e1 578 mix_sub_columns( s1 );
mluis 0:cb80564f40e1 579 add_round_key( s1, ctx->ksch + r * N_BLOCK);
mluis 0:cb80564f40e1 580 }
mluis 0:cb80564f40e1 581 #else
mluis 0:cb80564f40e1 582 { uint8_t s2[N_BLOCK];
mluis 0:cb80564f40e1 583 mix_sub_columns( s2, s1 );
mluis 0:cb80564f40e1 584 copy_and_key( s1, s2, ctx->ksch + r * N_BLOCK);
mluis 0:cb80564f40e1 585 }
mluis 0:cb80564f40e1 586 #endif
mluis 0:cb80564f40e1 587 shift_sub_rows( s1 );
mluis 0:cb80564f40e1 588 copy_and_key( out, s1, ctx->ksch + r * N_BLOCK );
mluis 0:cb80564f40e1 589 }
mluis 0:cb80564f40e1 590 else
mluis 0:cb80564f40e1 591 return ( uint8_t )-1;
mluis 0:cb80564f40e1 592 return 0;
mluis 0:cb80564f40e1 593 }
mluis 0:cb80564f40e1 594
mluis 0:cb80564f40e1 595 /* CBC encrypt a number of blocks (input and return an IV) */
mluis 0:cb80564f40e1 596
mluis 0:cb80564f40e1 597 return_type aes_cbc_encrypt( const uint8_t *in, uint8_t *out,
mluis 0:cb80564f40e1 598 int32_t n_block, uint8_t iv[N_BLOCK], const aes_context ctx[1] )
mluis 0:cb80564f40e1 599 {
mluis 0:cb80564f40e1 600
mluis 0:cb80564f40e1 601 while(n_block--)
mluis 0:cb80564f40e1 602 {
mluis 0:cb80564f40e1 603 xor_block(iv, in);
mluis 0:cb80564f40e1 604 if(aes_encrypt(iv, iv, ctx) != EXIT_SUCCESS)
mluis 0:cb80564f40e1 605 return EXIT_FAILURE;
mluis 0:cb80564f40e1 606 //memcpy(out, iv, N_BLOCK);
mluis 0:cb80564f40e1 607 block_copy(out, iv);
mluis 0:cb80564f40e1 608 in += N_BLOCK;
mluis 0:cb80564f40e1 609 out += N_BLOCK;
mluis 0:cb80564f40e1 610 }
mluis 0:cb80564f40e1 611 return EXIT_SUCCESS;
mluis 0:cb80564f40e1 612 }
mluis 0:cb80564f40e1 613
mluis 0:cb80564f40e1 614 #endif
mluis 0:cb80564f40e1 615
mluis 0:cb80564f40e1 616 #if defined( AES_DEC_PREKEYED )
mluis 0:cb80564f40e1 617
mluis 0:cb80564f40e1 618 /* Decrypt a single block of 16 bytes */
mluis 0:cb80564f40e1 619
mluis 0:cb80564f40e1 620 return_type aes_decrypt( const uint8_t in[N_BLOCK], uint8_t out[N_BLOCK], const aes_context ctx[1] )
mluis 0:cb80564f40e1 621 {
mluis 0:cb80564f40e1 622 if( ctx->rnd )
mluis 0:cb80564f40e1 623 {
mluis 0:cb80564f40e1 624 uint8_t s1[N_BLOCK], r;
mluis 0:cb80564f40e1 625 copy_and_key( s1, in, ctx->ksch + ctx->rnd * N_BLOCK );
mluis 0:cb80564f40e1 626 inv_shift_sub_rows( s1 );
mluis 0:cb80564f40e1 627
mluis 0:cb80564f40e1 628 for( r = ctx->rnd ; --r ; )
mluis 0:cb80564f40e1 629 #if defined( VERSION_1 )
mluis 0:cb80564f40e1 630 {
mluis 0:cb80564f40e1 631 add_round_key( s1, ctx->ksch + r * N_BLOCK );
mluis 0:cb80564f40e1 632 inv_mix_sub_columns( s1 );
mluis 0:cb80564f40e1 633 }
mluis 0:cb80564f40e1 634 #else
mluis 0:cb80564f40e1 635 { uint8_t s2[N_BLOCK];
mluis 0:cb80564f40e1 636 copy_and_key( s2, s1, ctx->ksch + r * N_BLOCK );
mluis 0:cb80564f40e1 637 inv_mix_sub_columns( s1, s2 );
mluis 0:cb80564f40e1 638 }
mluis 0:cb80564f40e1 639 #endif
mluis 0:cb80564f40e1 640 copy_and_key( out, s1, ctx->ksch );
mluis 0:cb80564f40e1 641 }
mluis 0:cb80564f40e1 642 else
mluis 0:cb80564f40e1 643 return -1;
mluis 0:cb80564f40e1 644 return 0;
mluis 0:cb80564f40e1 645 }
mluis 0:cb80564f40e1 646
mluis 0:cb80564f40e1 647 /* CBC decrypt a number of blocks (input and return an IV) */
mluis 0:cb80564f40e1 648
mluis 0:cb80564f40e1 649 return_type aes_cbc_decrypt( const uint8_t *in, uint8_t *out,
mluis 0:cb80564f40e1 650 int32_t n_block, uint8_t iv[N_BLOCK], const aes_context ctx[1] )
mluis 0:cb80564f40e1 651 {
mluis 0:cb80564f40e1 652 while(n_block--)
mluis 0:cb80564f40e1 653 { uint8_t tmp[N_BLOCK];
mluis 0:cb80564f40e1 654
mluis 0:cb80564f40e1 655 //memcpy(tmp, in, N_BLOCK);
mluis 0:cb80564f40e1 656 block_copy(tmp, in);
mluis 0:cb80564f40e1 657 if(aes_decrypt(in, out, ctx) != EXIT_SUCCESS)
mluis 0:cb80564f40e1 658 return EXIT_FAILURE;
mluis 0:cb80564f40e1 659 xor_block(out, iv);
mluis 0:cb80564f40e1 660 //memcpy(iv, tmp, N_BLOCK);
mluis 0:cb80564f40e1 661 block_copy(iv, tmp);
mluis 0:cb80564f40e1 662 in += N_BLOCK;
mluis 0:cb80564f40e1 663 out += N_BLOCK;
mluis 0:cb80564f40e1 664 }
mluis 0:cb80564f40e1 665 return EXIT_SUCCESS;
mluis 0:cb80564f40e1 666 }
mluis 0:cb80564f40e1 667
mluis 0:cb80564f40e1 668 #endif
mluis 0:cb80564f40e1 669
mluis 0:cb80564f40e1 670 #if defined( AES_ENC_128_OTFK )
mluis 0:cb80564f40e1 671
mluis 0:cb80564f40e1 672 /* The 'on the fly' encryption key update for for 128 bit keys */
mluis 0:cb80564f40e1 673
mluis 0:cb80564f40e1 674 static void update_encrypt_key_128( uint8_t k[N_BLOCK], uint8_t *rc )
mluis 0:cb80564f40e1 675 { uint8_t cc;
mluis 0:cb80564f40e1 676
mluis 0:cb80564f40e1 677 k[0] ^= s_box(k[13]) ^ *rc;
mluis 0:cb80564f40e1 678 k[1] ^= s_box(k[14]);
mluis 0:cb80564f40e1 679 k[2] ^= s_box(k[15]);
mluis 0:cb80564f40e1 680 k[3] ^= s_box(k[12]);
mluis 0:cb80564f40e1 681 *rc = f2( *rc );
mluis 0:cb80564f40e1 682
mluis 0:cb80564f40e1 683 for(cc = 4; cc < 16; cc += 4 )
mluis 0:cb80564f40e1 684 {
mluis 0:cb80564f40e1 685 k[cc + 0] ^= k[cc - 4];
mluis 0:cb80564f40e1 686 k[cc + 1] ^= k[cc - 3];
mluis 0:cb80564f40e1 687 k[cc + 2] ^= k[cc - 2];
mluis 0:cb80564f40e1 688 k[cc + 3] ^= k[cc - 1];
mluis 0:cb80564f40e1 689 }
mluis 0:cb80564f40e1 690 }
mluis 0:cb80564f40e1 691
mluis 0:cb80564f40e1 692 /* Encrypt a single block of 16 bytes with 'on the fly' 128 bit keying */
mluis 0:cb80564f40e1 693
mluis 0:cb80564f40e1 694 void aes_encrypt_128( const uint8_t in[N_BLOCK], uint8_t out[N_BLOCK],
mluis 0:cb80564f40e1 695 const uint8_t key[N_BLOCK], uint8_t o_key[N_BLOCK] )
mluis 0:cb80564f40e1 696 { uint8_t s1[N_BLOCK], r, rc = 1;
mluis 0:cb80564f40e1 697
mluis 0:cb80564f40e1 698 if(o_key != key)
mluis 0:cb80564f40e1 699 block_copy( o_key, key );
mluis 0:cb80564f40e1 700 copy_and_key( s1, in, o_key );
mluis 0:cb80564f40e1 701
mluis 0:cb80564f40e1 702 for( r = 1 ; r < 10 ; ++r )
mluis 0:cb80564f40e1 703 #if defined( VERSION_1 )
mluis 0:cb80564f40e1 704 {
mluis 0:cb80564f40e1 705 mix_sub_columns( s1 );
mluis 0:cb80564f40e1 706 update_encrypt_key_128( o_key, &rc );
mluis 0:cb80564f40e1 707 add_round_key( s1, o_key );
mluis 0:cb80564f40e1 708 }
mluis 0:cb80564f40e1 709 #else
mluis 0:cb80564f40e1 710 { uint8_t s2[N_BLOCK];
mluis 0:cb80564f40e1 711 mix_sub_columns( s2, s1 );
mluis 0:cb80564f40e1 712 update_encrypt_key_128( o_key, &rc );
mluis 0:cb80564f40e1 713 copy_and_key( s1, s2, o_key );
mluis 0:cb80564f40e1 714 }
mluis 0:cb80564f40e1 715 #endif
mluis 0:cb80564f40e1 716
mluis 0:cb80564f40e1 717 shift_sub_rows( s1 );
mluis 0:cb80564f40e1 718 update_encrypt_key_128( o_key, &rc );
mluis 0:cb80564f40e1 719 copy_and_key( out, s1, o_key );
mluis 0:cb80564f40e1 720 }
mluis 0:cb80564f40e1 721
mluis 0:cb80564f40e1 722 #endif
mluis 0:cb80564f40e1 723
mluis 0:cb80564f40e1 724 #if defined( AES_DEC_128_OTFK )
mluis 0:cb80564f40e1 725
mluis 0:cb80564f40e1 726 /* The 'on the fly' decryption key update for for 128 bit keys */
mluis 0:cb80564f40e1 727
mluis 0:cb80564f40e1 728 static void update_decrypt_key_128( uint8_t k[N_BLOCK], uint8_t *rc )
mluis 0:cb80564f40e1 729 { uint8_t cc;
mluis 0:cb80564f40e1 730
mluis 0:cb80564f40e1 731 for( cc = 12; cc > 0; cc -= 4 )
mluis 0:cb80564f40e1 732 {
mluis 0:cb80564f40e1 733 k[cc + 0] ^= k[cc - 4];
mluis 0:cb80564f40e1 734 k[cc + 1] ^= k[cc - 3];
mluis 0:cb80564f40e1 735 k[cc + 2] ^= k[cc - 2];
mluis 0:cb80564f40e1 736 k[cc + 3] ^= k[cc - 1];
mluis 0:cb80564f40e1 737 }
mluis 0:cb80564f40e1 738 *rc = d2(*rc);
mluis 0:cb80564f40e1 739 k[0] ^= s_box(k[13]) ^ *rc;
mluis 0:cb80564f40e1 740 k[1] ^= s_box(k[14]);
mluis 0:cb80564f40e1 741 k[2] ^= s_box(k[15]);
mluis 0:cb80564f40e1 742 k[3] ^= s_box(k[12]);
mluis 0:cb80564f40e1 743 }
mluis 0:cb80564f40e1 744
mluis 0:cb80564f40e1 745 /* Decrypt a single block of 16 bytes with 'on the fly' 128 bit keying */
mluis 0:cb80564f40e1 746
mluis 0:cb80564f40e1 747 void aes_decrypt_128( const uint8_t in[N_BLOCK], uint8_t out[N_BLOCK],
mluis 0:cb80564f40e1 748 const uint8_t key[N_BLOCK], uint8_t o_key[N_BLOCK] )
mluis 0:cb80564f40e1 749 {
mluis 0:cb80564f40e1 750 uint8_t s1[N_BLOCK], r, rc = 0x6c;
mluis 0:cb80564f40e1 751 if(o_key != key)
mluis 0:cb80564f40e1 752 block_copy( o_key, key );
mluis 0:cb80564f40e1 753
mluis 0:cb80564f40e1 754 copy_and_key( s1, in, o_key );
mluis 0:cb80564f40e1 755 inv_shift_sub_rows( s1 );
mluis 0:cb80564f40e1 756
mluis 0:cb80564f40e1 757 for( r = 10 ; --r ; )
mluis 0:cb80564f40e1 758 #if defined( VERSION_1 )
mluis 0:cb80564f40e1 759 {
mluis 0:cb80564f40e1 760 update_decrypt_key_128( o_key, &rc );
mluis 0:cb80564f40e1 761 add_round_key( s1, o_key );
mluis 0:cb80564f40e1 762 inv_mix_sub_columns( s1 );
mluis 0:cb80564f40e1 763 }
mluis 0:cb80564f40e1 764 #else
mluis 0:cb80564f40e1 765 { uint8_t s2[N_BLOCK];
mluis 0:cb80564f40e1 766 update_decrypt_key_128( o_key, &rc );
mluis 0:cb80564f40e1 767 copy_and_key( s2, s1, o_key );
mluis 0:cb80564f40e1 768 inv_mix_sub_columns( s1, s2 );
mluis 0:cb80564f40e1 769 }
mluis 0:cb80564f40e1 770 #endif
mluis 0:cb80564f40e1 771 update_decrypt_key_128( o_key, &rc );
mluis 0:cb80564f40e1 772 copy_and_key( out, s1, o_key );
mluis 0:cb80564f40e1 773 }
mluis 0:cb80564f40e1 774
mluis 0:cb80564f40e1 775 #endif
mluis 0:cb80564f40e1 776
mluis 0:cb80564f40e1 777 #if defined( AES_ENC_256_OTFK )
mluis 0:cb80564f40e1 778
mluis 0:cb80564f40e1 779 /* The 'on the fly' encryption key update for for 256 bit keys */
mluis 0:cb80564f40e1 780
mluis 0:cb80564f40e1 781 static void update_encrypt_key_256( uint8_t k[2 * N_BLOCK], uint8_t *rc )
mluis 0:cb80564f40e1 782 { uint8_t cc;
mluis 0:cb80564f40e1 783
mluis 0:cb80564f40e1 784 k[0] ^= s_box(k[29]) ^ *rc;
mluis 0:cb80564f40e1 785 k[1] ^= s_box(k[30]);
mluis 0:cb80564f40e1 786 k[2] ^= s_box(k[31]);
mluis 0:cb80564f40e1 787 k[3] ^= s_box(k[28]);
mluis 0:cb80564f40e1 788 *rc = f2( *rc );
mluis 0:cb80564f40e1 789
mluis 0:cb80564f40e1 790 for(cc = 4; cc < 16; cc += 4)
mluis 0:cb80564f40e1 791 {
mluis 0:cb80564f40e1 792 k[cc + 0] ^= k[cc - 4];
mluis 0:cb80564f40e1 793 k[cc + 1] ^= k[cc - 3];
mluis 0:cb80564f40e1 794 k[cc + 2] ^= k[cc - 2];
mluis 0:cb80564f40e1 795 k[cc + 3] ^= k[cc - 1];
mluis 0:cb80564f40e1 796 }
mluis 0:cb80564f40e1 797
mluis 0:cb80564f40e1 798 k[16] ^= s_box(k[12]);
mluis 0:cb80564f40e1 799 k[17] ^= s_box(k[13]);
mluis 0:cb80564f40e1 800 k[18] ^= s_box(k[14]);
mluis 0:cb80564f40e1 801 k[19] ^= s_box(k[15]);
mluis 0:cb80564f40e1 802
mluis 0:cb80564f40e1 803 for( cc = 20; cc < 32; cc += 4 )
mluis 0:cb80564f40e1 804 {
mluis 0:cb80564f40e1 805 k[cc + 0] ^= k[cc - 4];
mluis 0:cb80564f40e1 806 k[cc + 1] ^= k[cc - 3];
mluis 0:cb80564f40e1 807 k[cc + 2] ^= k[cc - 2];
mluis 0:cb80564f40e1 808 k[cc + 3] ^= k[cc - 1];
mluis 0:cb80564f40e1 809 }
mluis 0:cb80564f40e1 810 }
mluis 0:cb80564f40e1 811
mluis 0:cb80564f40e1 812 /* Encrypt a single block of 16 bytes with 'on the fly' 256 bit keying */
mluis 0:cb80564f40e1 813
mluis 0:cb80564f40e1 814 void aes_encrypt_256( const uint8_t in[N_BLOCK], uint8_t out[N_BLOCK],
mluis 0:cb80564f40e1 815 const uint8_t key[2 * N_BLOCK], uint8_t o_key[2 * N_BLOCK] )
mluis 0:cb80564f40e1 816 {
mluis 0:cb80564f40e1 817 uint8_t s1[N_BLOCK], r, rc = 1;
mluis 0:cb80564f40e1 818 if(o_key != key)
mluis 0:cb80564f40e1 819 {
mluis 0:cb80564f40e1 820 block_copy( o_key, key );
mluis 0:cb80564f40e1 821 block_copy( o_key + 16, key + 16 );
mluis 0:cb80564f40e1 822 }
mluis 0:cb80564f40e1 823 copy_and_key( s1, in, o_key );
mluis 0:cb80564f40e1 824
mluis 0:cb80564f40e1 825 for( r = 1 ; r < 14 ; ++r )
mluis 0:cb80564f40e1 826 #if defined( VERSION_1 )
mluis 0:cb80564f40e1 827 {
mluis 0:cb80564f40e1 828 mix_sub_columns(s1);
mluis 0:cb80564f40e1 829 if( r & 1 )
mluis 0:cb80564f40e1 830 add_round_key( s1, o_key + 16 );
mluis 0:cb80564f40e1 831 else
mluis 0:cb80564f40e1 832 {
mluis 0:cb80564f40e1 833 update_encrypt_key_256( o_key, &rc );
mluis 0:cb80564f40e1 834 add_round_key( s1, o_key );
mluis 0:cb80564f40e1 835 }
mluis 0:cb80564f40e1 836 }
mluis 0:cb80564f40e1 837 #else
mluis 0:cb80564f40e1 838 { uint8_t s2[N_BLOCK];
mluis 0:cb80564f40e1 839 mix_sub_columns( s2, s1 );
mluis 0:cb80564f40e1 840 if( r & 1 )
mluis 0:cb80564f40e1 841 copy_and_key( s1, s2, o_key + 16 );
mluis 0:cb80564f40e1 842 else
mluis 0:cb80564f40e1 843 {
mluis 0:cb80564f40e1 844 update_encrypt_key_256( o_key, &rc );
mluis 0:cb80564f40e1 845 copy_and_key( s1, s2, o_key );
mluis 0:cb80564f40e1 846 }
mluis 0:cb80564f40e1 847 }
mluis 0:cb80564f40e1 848 #endif
mluis 0:cb80564f40e1 849
mluis 0:cb80564f40e1 850 shift_sub_rows( s1 );
mluis 0:cb80564f40e1 851 update_encrypt_key_256( o_key, &rc );
mluis 0:cb80564f40e1 852 copy_and_key( out, s1, o_key );
mluis 0:cb80564f40e1 853 }
mluis 0:cb80564f40e1 854
mluis 0:cb80564f40e1 855 #endif
mluis 0:cb80564f40e1 856
mluis 0:cb80564f40e1 857 #if defined( AES_DEC_256_OTFK )
mluis 0:cb80564f40e1 858
mluis 0:cb80564f40e1 859 /* The 'on the fly' encryption key update for for 256 bit keys */
mluis 0:cb80564f40e1 860
mluis 0:cb80564f40e1 861 static void update_decrypt_key_256( uint8_t k[2 * N_BLOCK], uint8_t *rc )
mluis 0:cb80564f40e1 862 { uint8_t cc;
mluis 0:cb80564f40e1 863
mluis 0:cb80564f40e1 864 for(cc = 28; cc > 16; cc -= 4)
mluis 0:cb80564f40e1 865 {
mluis 0:cb80564f40e1 866 k[cc + 0] ^= k[cc - 4];
mluis 0:cb80564f40e1 867 k[cc + 1] ^= k[cc - 3];
mluis 0:cb80564f40e1 868 k[cc + 2] ^= k[cc - 2];
mluis 0:cb80564f40e1 869 k[cc + 3] ^= k[cc - 1];
mluis 0:cb80564f40e1 870 }
mluis 0:cb80564f40e1 871
mluis 0:cb80564f40e1 872 k[16] ^= s_box(k[12]);
mluis 0:cb80564f40e1 873 k[17] ^= s_box(k[13]);
mluis 0:cb80564f40e1 874 k[18] ^= s_box(k[14]);
mluis 0:cb80564f40e1 875 k[19] ^= s_box(k[15]);
mluis 0:cb80564f40e1 876
mluis 0:cb80564f40e1 877 for(cc = 12; cc > 0; cc -= 4)
mluis 0:cb80564f40e1 878 {
mluis 0:cb80564f40e1 879 k[cc + 0] ^= k[cc - 4];
mluis 0:cb80564f40e1 880 k[cc + 1] ^= k[cc - 3];
mluis 0:cb80564f40e1 881 k[cc + 2] ^= k[cc - 2];
mluis 0:cb80564f40e1 882 k[cc + 3] ^= k[cc - 1];
mluis 0:cb80564f40e1 883 }
mluis 0:cb80564f40e1 884
mluis 0:cb80564f40e1 885 *rc = d2(*rc);
mluis 0:cb80564f40e1 886 k[0] ^= s_box(k[29]) ^ *rc;
mluis 0:cb80564f40e1 887 k[1] ^= s_box(k[30]);
mluis 0:cb80564f40e1 888 k[2] ^= s_box(k[31]);
mluis 0:cb80564f40e1 889 k[3] ^= s_box(k[28]);
mluis 0:cb80564f40e1 890 }
mluis 0:cb80564f40e1 891
mluis 0:cb80564f40e1 892 /* Decrypt a single block of 16 bytes with 'on the fly'
mluis 0:cb80564f40e1 893 256 bit keying
mluis 0:cb80564f40e1 894 */
mluis 0:cb80564f40e1 895 void aes_decrypt_256( const uint8_t in[N_BLOCK], uint8_t out[N_BLOCK],
mluis 0:cb80564f40e1 896 const uint8_t key[2 * N_BLOCK], uint8_t o_key[2 * N_BLOCK] )
mluis 0:cb80564f40e1 897 {
mluis 0:cb80564f40e1 898 uint8_t s1[N_BLOCK], r, rc = 0x80;
mluis 0:cb80564f40e1 899
mluis 0:cb80564f40e1 900 if(o_key != key)
mluis 0:cb80564f40e1 901 {
mluis 0:cb80564f40e1 902 block_copy( o_key, key );
mluis 0:cb80564f40e1 903 block_copy( o_key + 16, key + 16 );
mluis 0:cb80564f40e1 904 }
mluis 0:cb80564f40e1 905
mluis 0:cb80564f40e1 906 copy_and_key( s1, in, o_key );
mluis 0:cb80564f40e1 907 inv_shift_sub_rows( s1 );
mluis 0:cb80564f40e1 908
mluis 0:cb80564f40e1 909 for( r = 14 ; --r ; )
mluis 0:cb80564f40e1 910 #if defined( VERSION_1 )
mluis 0:cb80564f40e1 911 {
mluis 0:cb80564f40e1 912 if( ( r & 1 ) )
mluis 0:cb80564f40e1 913 {
mluis 0:cb80564f40e1 914 update_decrypt_key_256( o_key, &rc );
mluis 0:cb80564f40e1 915 add_round_key( s1, o_key + 16 );
mluis 0:cb80564f40e1 916 }
mluis 0:cb80564f40e1 917 else
mluis 0:cb80564f40e1 918 add_round_key( s1, o_key );
mluis 0:cb80564f40e1 919 inv_mix_sub_columns( s1 );
mluis 0:cb80564f40e1 920 }
mluis 0:cb80564f40e1 921 #else
mluis 0:cb80564f40e1 922 { uint8_t s2[N_BLOCK];
mluis 0:cb80564f40e1 923 if( ( r & 1 ) )
mluis 0:cb80564f40e1 924 {
mluis 0:cb80564f40e1 925 update_decrypt_key_256( o_key, &rc );
mluis 0:cb80564f40e1 926 copy_and_key( s2, s1, o_key + 16 );
mluis 0:cb80564f40e1 927 }
mluis 0:cb80564f40e1 928 else
mluis 0:cb80564f40e1 929 copy_and_key( s2, s1, o_key );
mluis 0:cb80564f40e1 930 inv_mix_sub_columns( s1, s2 );
mluis 0:cb80564f40e1 931 }
mluis 0:cb80564f40e1 932 #endif
mluis 0:cb80564f40e1 933 copy_and_key( out, s1, o_key );
mluis 0:cb80564f40e1 934 }
mluis 0:cb80564f40e1 935
mluis 0:cb80564f40e1 936 #endif