nimita naik / Mbed 2 deprecated LoRaWAN-STM32

Application example using LoRaWAN-lib MAC layer implementation for STM32 + SX1276 on OpenChirp

Dependencies:   mbed LoRaWAN-lib SX1276Lib

system/crypto/aes.cpp@13:779fef3e4573, 2019-09-15 (annotated)

Committer:
nimita23
Date:
Sun Sep 15 17:10:06 2019 +0000
Revision:
13:779fef3e4573
Parent:
5:1e9f6a365854 
led working

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mluis 1:352f608c3337 1 /*
mluis 1:352f608c3337 2 ---------------------------------------------------------------------------
mluis 1:352f608c3337 3 Copyright (c) 1998-2008, Brian Gladman, Worcester, UK. All rights reserved.
mluis 1:352f608c3337 4
mluis 1:352f608c3337 5 LICENSE TERMS
mluis 1:352f608c3337 6
mluis 1:352f608c3337 7 The redistribution and use of this software (with or without changes)
mluis 1:352f608c3337 8 is allowed without the payment of fees or royalties provided that:
mluis 1:352f608c3337 9
mluis 1:352f608c3337 10 1. source code distributions include the above copyright notice, this
mluis 1:352f608c3337 11 list of conditions and the following disclaimer;
mluis 1:352f608c3337 12
mluis 1:352f608c3337 13 2. binary distributions include the above copyright notice, this list
mluis 1:352f608c3337 14 of conditions and the following disclaimer in their documentation;
mluis 1:352f608c3337 15
mluis 1:352f608c3337 16 3. the name of the copyright holder is not used to endorse products
mluis 1:352f608c3337 17 built using this software without specific written permission.
mluis 1:352f608c3337 18
mluis 1:352f608c3337 19 DISCLAIMER
mluis 1:352f608c3337 20
mluis 1:352f608c3337 21 This software is provided 'as is' with no explicit or implied warranties
mluis 1:352f608c3337 22 in respect of its properties, including, but not limited to, correctness
mluis 1:352f608c3337 23 and/or fitness for purpose.
mluis 1:352f608c3337 24 ---------------------------------------------------------------------------
mluis 1:352f608c3337 25 Issue 09/09/2006
mluis 1:352f608c3337 26
mluis 1:352f608c3337 27 This is an AES implementation that uses only 8-bit byte operations on the
mluis 1:352f608c3337 28 cipher state (there are options to use 32-bit types if available).
mluis 1:352f608c3337 29
mluis 1:352f608c3337 30 The combination of mix columns and byte substitution used here is based on
mluis 1:352f608c3337 31 that developed by Karl Malbrain. His contribution is acknowledged.
mluis 1:352f608c3337 32 */
mluis 1:352f608c3337 33
mluis 1:352f608c3337 34 /* define if you have a fast memcpy function on your system */
mluis 1:352f608c3337 35 #if 0
mluis 1:352f608c3337 36 # define HAVE_MEMCPY
mluis 1:352f608c3337 37 # include <string.h>
mluis 1:352f608c3337 38 # if defined( _MSC_VER )
mluis 1:352f608c3337 39 # include <intrin.h>
mluis 1:352f608c3337 40 # pragma intrinsic( memcpy )
mluis 1:352f608c3337 41 # endif
mluis 1:352f608c3337 42 #endif
mluis 1:352f608c3337 43
mluis 1:352f608c3337 44
mluis 1:352f608c3337 45 #include <stdlib.h>
mluis 1:352f608c3337 46 #include <stdint.h>
mluis 1:352f608c3337 47
mluis 1:352f608c3337 48 /* define if you have fast 32-bit types on your system */
mluis 5:1e9f6a365854 49 #if ( __CORTEX_M != 0 ) // if Cortex is different from M0/M0+
mluis 1:352f608c3337 50 # define HAVE_UINT_32T
mluis 1:352f608c3337 51 #endif
mluis 1:352f608c3337 52
mluis 1:352f608c3337 53 /* define if you don't want any tables */
mluis 1:352f608c3337 54 #if 1
mluis 1:352f608c3337 55 # define USE_TABLES
mluis 1:352f608c3337 56 #endif
mluis 1:352f608c3337 57
mluis 1:352f608c3337 58 /* On Intel Core 2 duo VERSION_1 is faster */
mluis 1:352f608c3337 59
mluis 1:352f608c3337 60 /* alternative versions (test for performance on your system) */
mluis 1:352f608c3337 61 #if 1
mluis 1:352f608c3337 62 # define VERSION_1
mluis 1:352f608c3337 63 #endif
mluis 1:352f608c3337 64
mluis 1:352f608c3337 65 #include "aes.h"
mluis 1:352f608c3337 66
mluis 1:352f608c3337 67 //#if defined( HAVE_UINT_32T )
mluis 1:352f608c3337 68 // typedef unsigned long uint32_t;
mluis 1:352f608c3337 69 //#endif
mluis 1:352f608c3337 70
mluis 1:352f608c3337 71 /* functions for finite field multiplication in the AES Galois field */
mluis 1:352f608c3337 72
mluis 1:352f608c3337 73 #define WPOLY 0x011b
mluis 1:352f608c3337 74 #define BPOLY 0x1b
mluis 1:352f608c3337 75 #define DPOLY 0x008d
mluis 1:352f608c3337 76
mluis 1:352f608c3337 77 #define f1(x) (x)
mluis 1:352f608c3337 78 #define f2(x) ((x << 1) ^ (((x >> 7) & 1) * WPOLY))
mluis 1:352f608c3337 79 #define f4(x) ((x << 2) ^ (((x >> 6) & 1) * WPOLY) ^ (((x >> 6) & 2) * WPOLY))
mluis 1:352f608c3337 80 #define f8(x) ((x << 3) ^ (((x >> 5) & 1) * WPOLY) ^ (((x >> 5) & 2) * WPOLY) \
mluis 1:352f608c3337 81 ^ (((x >> 5) & 4) * WPOLY))
mluis 1:352f608c3337 82 #define d2(x) (((x) >> 1) ^ ((x) & 1 ? DPOLY : 0))
mluis 1:352f608c3337 83
mluis 1:352f608c3337 84 #define f3(x) (f2(x) ^ x)
mluis 1:352f608c3337 85 #define f9(x) (f8(x) ^ x)
mluis 1:352f608c3337 86 #define fb(x) (f8(x) ^ f2(x) ^ x)
mluis 1:352f608c3337 87 #define fd(x) (f8(x) ^ f4(x) ^ x)
mluis 1:352f608c3337 88 #define fe(x) (f8(x) ^ f4(x) ^ f2(x))
mluis 1:352f608c3337 89
mluis 1:352f608c3337 90 #if defined( USE_TABLES )
mluis 1:352f608c3337 91
mluis 1:352f608c3337 92 #define sb_data(w) { /* S Box data values */ \
mluis 1:352f608c3337 93 w(0x63), w(0x7c), w(0x77), w(0x7b), w(0xf2), w(0x6b), w(0x6f), w(0xc5),\
mluis 1:352f608c3337 94 w(0x30), w(0x01), w(0x67), w(0x2b), w(0xfe), w(0xd7), w(0xab), w(0x76),\
mluis 1:352f608c3337 95 w(0xca), w(0x82), w(0xc9), w(0x7d), w(0xfa), w(0x59), w(0x47), w(0xf0),\
mluis 1:352f608c3337 96 w(0xad), w(0xd4), w(0xa2), w(0xaf), w(0x9c), w(0xa4), w(0x72), w(0xc0),\
mluis 1:352f608c3337 97 w(0xb7), w(0xfd), w(0x93), w(0x26), w(0x36), w(0x3f), w(0xf7), w(0xcc),\
mluis 1:352f608c3337 98 w(0x34), w(0xa5), w(0xe5), w(0xf1), w(0x71), w(0xd8), w(0x31), w(0x15),\
mluis 1:352f608c3337 99 w(0x04), w(0xc7), w(0x23), w(0xc3), w(0x18), w(0x96), w(0x05), w(0x9a),\
mluis 1:352f608c3337 100 w(0x07), w(0x12), w(0x80), w(0xe2), w(0xeb), w(0x27), w(0xb2), w(0x75),\
mluis 1:352f608c3337 101 w(0x09), w(0x83), w(0x2c), w(0x1a), w(0x1b), w(0x6e), w(0x5a), w(0xa0),\
mluis 1:352f608c3337 102 w(0x52), w(0x3b), w(0xd6), w(0xb3), w(0x29), w(0xe3), w(0x2f), w(0x84),\
mluis 1:352f608c3337 103 w(0x53), w(0xd1), w(0x00), w(0xed), w(0x20), w(0xfc), w(0xb1), w(0x5b),\
mluis 1:352f608c3337 104 w(0x6a), w(0xcb), w(0xbe), w(0x39), w(0x4a), w(0x4c), w(0x58), w(0xcf),\
mluis 1:352f608c3337 105 w(0xd0), w(0xef), w(0xaa), w(0xfb), w(0x43), w(0x4d), w(0x33), w(0x85),\
mluis 1:352f608c3337 106 w(0x45), w(0xf9), w(0x02), w(0x7f), w(0x50), w(0x3c), w(0x9f), w(0xa8),\
mluis 1:352f608c3337 107 w(0x51), w(0xa3), w(0x40), w(0x8f), w(0x92), w(0x9d), w(0x38), w(0xf5),\
mluis 1:352f608c3337 108 w(0xbc), w(0xb6), w(0xda), w(0x21), w(0x10), w(0xff), w(0xf3), w(0xd2),\
mluis 1:352f608c3337 109 w(0xcd), w(0x0c), w(0x13), w(0xec), w(0x5f), w(0x97), w(0x44), w(0x17),\
mluis 1:352f608c3337 110 w(0xc4), w(0xa7), w(0x7e), w(0x3d), w(0x64), w(0x5d), w(0x19), w(0x73),\
mluis 1:352f608c3337 111 w(0x60), w(0x81), w(0x4f), w(0xdc), w(0x22), w(0x2a), w(0x90), w(0x88),\
mluis 1:352f608c3337 112 w(0x46), w(0xee), w(0xb8), w(0x14), w(0xde), w(0x5e), w(0x0b), w(0xdb),\
mluis 1:352f608c3337 113 w(0xe0), w(0x32), w(0x3a), w(0x0a), w(0x49), w(0x06), w(0x24), w(0x5c),\
mluis 1:352f608c3337 114 w(0xc2), w(0xd3), w(0xac), w(0x62), w(0x91), w(0x95), w(0xe4), w(0x79),\
mluis 1:352f608c3337 115 w(0xe7), w(0xc8), w(0x37), w(0x6d), w(0x8d), w(0xd5), w(0x4e), w(0xa9),\
mluis 1:352f608c3337 116 w(0x6c), w(0x56), w(0xf4), w(0xea), w(0x65), w(0x7a), w(0xae), w(0x08),\
mluis 1:352f608c3337 117 w(0xba), w(0x78), w(0x25), w(0x2e), w(0x1c), w(0xa6), w(0xb4), w(0xc6),\
mluis 1:352f608c3337 118 w(0xe8), w(0xdd), w(0x74), w(0x1f), w(0x4b), w(0xbd), w(0x8b), w(0x8a),\
mluis 1:352f608c3337 119 w(0x70), w(0x3e), w(0xb5), w(0x66), w(0x48), w(0x03), w(0xf6), w(0x0e),\
mluis 1:352f608c3337 120 w(0x61), w(0x35), w(0x57), w(0xb9), w(0x86), w(0xc1), w(0x1d), w(0x9e),\
mluis 1:352f608c3337 121 w(0xe1), w(0xf8), w(0x98), w(0x11), w(0x69), w(0xd9), w(0x8e), w(0x94),\
mluis 1:352f608c3337 122 w(0x9b), w(0x1e), w(0x87), w(0xe9), w(0xce), w(0x55), w(0x28), w(0xdf),\
mluis 1:352f608c3337 123 w(0x8c), w(0xa1), w(0x89), w(0x0d), w(0xbf), w(0xe6), w(0x42), w(0x68),\
mluis 1:352f608c3337 124 w(0x41), w(0x99), w(0x2d), w(0x0f), w(0xb0), w(0x54), w(0xbb), w(0x16) }
mluis 1:352f608c3337 125
mluis 1:352f608c3337 126 #define isb_data(w) { /* inverse S Box data values */ \
mluis 1:352f608c3337 127 w(0x52), w(0x09), w(0x6a), w(0xd5), w(0x30), w(0x36), w(0xa5), w(0x38),\
mluis 1:352f608c3337 128 w(0xbf), w(0x40), w(0xa3), w(0x9e), w(0x81), w(0xf3), w(0xd7), w(0xfb),\
mluis 1:352f608c3337 129 w(0x7c), w(0xe3), w(0x39), w(0x82), w(0x9b), w(0x2f), w(0xff), w(0x87),\
mluis 1:352f608c3337 130 w(0x34), w(0x8e), w(0x43), w(0x44), w(0xc4), w(0xde), w(0xe9), w(0xcb),\
mluis 1:352f608c3337 131 w(0x54), w(0x7b), w(0x94), w(0x32), w(0xa6), w(0xc2), w(0x23), w(0x3d),\
mluis 1:352f608c3337 132 w(0xee), w(0x4c), w(0x95), w(0x0b), w(0x42), w(0xfa), w(0xc3), w(0x4e),\
mluis 1:352f608c3337 133 w(0x08), w(0x2e), w(0xa1), w(0x66), w(0x28), w(0xd9), w(0x24), w(0xb2),\
mluis 1:352f608c3337 134 w(0x76), w(0x5b), w(0xa2), w(0x49), w(0x6d), w(0x8b), w(0xd1), w(0x25),\
mluis 1:352f608c3337 135 w(0x72), w(0xf8), w(0xf6), w(0x64), w(0x86), w(0x68), w(0x98), w(0x16),\
mluis 1:352f608c3337 136 w(0xd4), w(0xa4), w(0x5c), w(0xcc), w(0x5d), w(0x65), w(0xb6), w(0x92),\
mluis 1:352f608c3337 137 w(0x6c), w(0x70), w(0x48), w(0x50), w(0xfd), w(0xed), w(0xb9), w(0xda),\
mluis 1:352f608c3337 138 w(0x5e), w(0x15), w(0x46), w(0x57), w(0xa7), w(0x8d), w(0x9d), w(0x84),\
mluis 1:352f608c3337 139 w(0x90), w(0xd8), w(0xab), w(0x00), w(0x8c), w(0xbc), w(0xd3), w(0x0a),\
mluis 1:352f608c3337 140 w(0xf7), w(0xe4), w(0x58), w(0x05), w(0xb8), w(0xb3), w(0x45), w(0x06),\
mluis 1:352f608c3337 141 w(0xd0), w(0x2c), w(0x1e), w(0x8f), w(0xca), w(0x3f), w(0x0f), w(0x02),\
mluis 1:352f608c3337 142 w(0xc1), w(0xaf), w(0xbd), w(0x03), w(0x01), w(0x13), w(0x8a), w(0x6b),\
mluis 1:352f608c3337 143 w(0x3a), w(0x91), w(0x11), w(0x41), w(0x4f), w(0x67), w(0xdc), w(0xea),\
mluis 1:352f608c3337 144 w(0x97), w(0xf2), w(0xcf), w(0xce), w(0xf0), w(0xb4), w(0xe6), w(0x73),\
mluis 1:352f608c3337 145 w(0x96), w(0xac), w(0x74), w(0x22), w(0xe7), w(0xad), w(0x35), w(0x85),\
mluis 1:352f608c3337 146 w(0xe2), w(0xf9), w(0x37), w(0xe8), w(0x1c), w(0x75), w(0xdf), w(0x6e),\
mluis 1:352f608c3337 147 w(0x47), w(0xf1), w(0x1a), w(0x71), w(0x1d), w(0x29), w(0xc5), w(0x89),\
mluis 1:352f608c3337 148 w(0x6f), w(0xb7), w(0x62), w(0x0e), w(0xaa), w(0x18), w(0xbe), w(0x1b),\
mluis 1:352f608c3337 149 w(0xfc), w(0x56), w(0x3e), w(0x4b), w(0xc6), w(0xd2), w(0x79), w(0x20),\
mluis 1:352f608c3337 150 w(0x9a), w(0xdb), w(0xc0), w(0xfe), w(0x78), w(0xcd), w(0x5a), w(0xf4),\
mluis 1:352f608c3337 151 w(0x1f), w(0xdd), w(0xa8), w(0x33), w(0x88), w(0x07), w(0xc7), w(0x31),\
mluis 1:352f608c3337 152 w(0xb1), w(0x12), w(0x10), w(0x59), w(0x27), w(0x80), w(0xec), w(0x5f),\
mluis 1:352f608c3337 153 w(0x60), w(0x51), w(0x7f), w(0xa9), w(0x19), w(0xb5), w(0x4a), w(0x0d),\
mluis 1:352f608c3337 154 w(0x2d), w(0xe5), w(0x7a), w(0x9f), w(0x93), w(0xc9), w(0x9c), w(0xef),\
mluis 1:352f608c3337 155 w(0xa0), w(0xe0), w(0x3b), w(0x4d), w(0xae), w(0x2a), w(0xf5), w(0xb0),\
mluis 1:352f608c3337 156 w(0xc8), w(0xeb), w(0xbb), w(0x3c), w(0x83), w(0x53), w(0x99), w(0x61),\
mluis 1:352f608c3337 157 w(0x17), w(0x2b), w(0x04), w(0x7e), w(0xba), w(0x77), w(0xd6), w(0x26),\
mluis 1:352f608c3337 158 w(0xe1), w(0x69), w(0x14), w(0x63), w(0x55), w(0x21), w(0x0c), w(0x7d) }
mluis 1:352f608c3337 159
mluis 1:352f608c3337 160 #define mm_data(w) { /* basic data for forming finite field tables */ \
mluis 1:352f608c3337 161 w(0x00), w(0x01), w(0x02), w(0x03), w(0x04), w(0x05), w(0x06), w(0x07),\
mluis 1:352f608c3337 162 w(0x08), w(0x09), w(0x0a), w(0x0b), w(0x0c), w(0x0d), w(0x0e), w(0x0f),\
mluis 1:352f608c3337 163 w(0x10), w(0x11), w(0x12), w(0x13), w(0x14), w(0x15), w(0x16), w(0x17),\
mluis 1:352f608c3337 164 w(0x18), w(0x19), w(0x1a), w(0x1b), w(0x1c), w(0x1d), w(0x1e), w(0x1f),\
mluis 1:352f608c3337 165 w(0x20), w(0x21), w(0x22), w(0x23), w(0x24), w(0x25), w(0x26), w(0x27),\
mluis 1:352f608c3337 166 w(0x28), w(0x29), w(0x2a), w(0x2b), w(0x2c), w(0x2d), w(0x2e), w(0x2f),\
mluis 1:352f608c3337 167 w(0x30), w(0x31), w(0x32), w(0x33), w(0x34), w(0x35), w(0x36), w(0x37),\
mluis 1:352f608c3337 168 w(0x38), w(0x39), w(0x3a), w(0x3b), w(0x3c), w(0x3d), w(0x3e), w(0x3f),\
mluis 1:352f608c3337 169 w(0x40), w(0x41), w(0x42), w(0x43), w(0x44), w(0x45), w(0x46), w(0x47),\
mluis 1:352f608c3337 170 w(0x48), w(0x49), w(0x4a), w(0x4b), w(0x4c), w(0x4d), w(0x4e), w(0x4f),\
mluis 1:352f608c3337 171 w(0x50), w(0x51), w(0x52), w(0x53), w(0x54), w(0x55), w(0x56), w(0x57),\
mluis 1:352f608c3337 172 w(0x58), w(0x59), w(0x5a), w(0x5b), w(0x5c), w(0x5d), w(0x5e), w(0x5f),\
mluis 1:352f608c3337 173 w(0x60), w(0x61), w(0x62), w(0x63), w(0x64), w(0x65), w(0x66), w(0x67),\
mluis 1:352f608c3337 174 w(0x68), w(0x69), w(0x6a), w(0x6b), w(0x6c), w(0x6d), w(0x6e), w(0x6f),\
mluis 1:352f608c3337 175 w(0x70), w(0x71), w(0x72), w(0x73), w(0x74), w(0x75), w(0x76), w(0x77),\
mluis 1:352f608c3337 176 w(0x78), w(0x79), w(0x7a), w(0x7b), w(0x7c), w(0x7d), w(0x7e), w(0x7f),\
mluis 1:352f608c3337 177 w(0x80), w(0x81), w(0x82), w(0x83), w(0x84), w(0x85), w(0x86), w(0x87),\
mluis 1:352f608c3337 178 w(0x88), w(0x89), w(0x8a), w(0x8b), w(0x8c), w(0x8d), w(0x8e), w(0x8f),\
mluis 1:352f608c3337 179 w(0x90), w(0x91), w(0x92), w(0x93), w(0x94), w(0x95), w(0x96), w(0x97),\
mluis 1:352f608c3337 180 w(0x98), w(0x99), w(0x9a), w(0x9b), w(0x9c), w(0x9d), w(0x9e), w(0x9f),\
mluis 1:352f608c3337 181 w(0xa0), w(0xa1), w(0xa2), w(0xa3), w(0xa4), w(0xa5), w(0xa6), w(0xa7),\
mluis 1:352f608c3337 182 w(0xa8), w(0xa9), w(0xaa), w(0xab), w(0xac), w(0xad), w(0xae), w(0xaf),\
mluis 1:352f608c3337 183 w(0xb0), w(0xb1), w(0xb2), w(0xb3), w(0xb4), w(0xb5), w(0xb6), w(0xb7),\
mluis 1:352f608c3337 184 w(0xb8), w(0xb9), w(0xba), w(0xbb), w(0xbc), w(0xbd), w(0xbe), w(0xbf),\
mluis 1:352f608c3337 185 w(0xc0), w(0xc1), w(0xc2), w(0xc3), w(0xc4), w(0xc5), w(0xc6), w(0xc7),\
mluis 1:352f608c3337 186 w(0xc8), w(0xc9), w(0xca), w(0xcb), w(0xcc), w(0xcd), w(0xce), w(0xcf),\
mluis 1:352f608c3337 187 w(0xd0), w(0xd1), w(0xd2), w(0xd3), w(0xd4), w(0xd5), w(0xd6), w(0xd7),\
mluis 1:352f608c3337 188 w(0xd8), w(0xd9), w(0xda), w(0xdb), w(0xdc), w(0xdd), w(0xde), w(0xdf),\
mluis 1:352f608c3337 189 w(0xe0), w(0xe1), w(0xe2), w(0xe3), w(0xe4), w(0xe5), w(0xe6), w(0xe7),\
mluis 1:352f608c3337 190 w(0xe8), w(0xe9), w(0xea), w(0xeb), w(0xec), w(0xed), w(0xee), w(0xef),\
mluis 1:352f608c3337 191 w(0xf0), w(0xf1), w(0xf2), w(0xf3), w(0xf4), w(0xf5), w(0xf6), w(0xf7),\
mluis 1:352f608c3337 192 w(0xf8), w(0xf9), w(0xfa), w(0xfb), w(0xfc), w(0xfd), w(0xfe), w(0xff) }
mluis 1:352f608c3337 193
mluis 1:352f608c3337 194 static const uint8_t sbox[256] = sb_data(f1);
mluis 1:352f608c3337 195
mluis 1:352f608c3337 196 #if defined( AES_DEC_PREKEYED )
mluis 1:352f608c3337 197 static const uint8_t isbox[256] = isb_data(f1);
mluis 1:352f608c3337 198 #endif
mluis 1:352f608c3337 199
mluis 1:352f608c3337 200 static const uint8_t gfm2_sbox[256] = sb_data(f2);
mluis 1:352f608c3337 201 static const uint8_t gfm3_sbox[256] = sb_data(f3);
mluis 1:352f608c3337 202
mluis 1:352f608c3337 203 #if defined( AES_DEC_PREKEYED )
mluis 1:352f608c3337 204 static const uint8_t gfmul_9[256] = mm_data(f9);
mluis 1:352f608c3337 205 static const uint8_t gfmul_b[256] = mm_data(fb);
mluis 1:352f608c3337 206 static const uint8_t gfmul_d[256] = mm_data(fd);
mluis 1:352f608c3337 207 static const uint8_t gfmul_e[256] = mm_data(fe);
mluis 1:352f608c3337 208 #endif
mluis 1:352f608c3337 209
mluis 1:352f608c3337 210 #define s_box(x) sbox[(x)]
mluis 1:352f608c3337 211 #if defined( AES_DEC_PREKEYED )
mluis 1:352f608c3337 212 #define is_box(x) isbox[(x)]
mluis 1:352f608c3337 213 #endif
mluis 1:352f608c3337 214 #define gfm2_sb(x) gfm2_sbox[(x)]
mluis 1:352f608c3337 215 #define gfm3_sb(x) gfm3_sbox[(x)]
mluis 1:352f608c3337 216 #if defined( AES_DEC_PREKEYED )
mluis 1:352f608c3337 217 #define gfm_9(x) gfmul_9[(x)]
mluis 1:352f608c3337 218 #define gfm_b(x) gfmul_b[(x)]
mluis 1:352f608c3337 219 #define gfm_d(x) gfmul_d[(x)]
mluis 1:352f608c3337 220 #define gfm_e(x) gfmul_e[(x)]
mluis 1:352f608c3337 221 #endif
mluis 1:352f608c3337 222 #else
mluis 1:352f608c3337 223
mluis 1:352f608c3337 224 /* this is the high bit of x right shifted by 1 */
mluis 1:352f608c3337 225 /* position. Since the starting polynomial has */
mluis 1:352f608c3337 226 /* 9 bits (0x11b), this right shift keeps the */
mluis 1:352f608c3337 227 /* values of all top bits within a byte */
mluis 1:352f608c3337 228
mluis 1:352f608c3337 229 static uint8_t hibit(const uint8_t x)
mluis 1:352f608c3337 230 { uint8_t r = (uint8_t)((x >> 1) | (x >> 2));
mluis 1:352f608c3337 231
mluis 1:352f608c3337 232 r |= (r >> 2);
mluis 1:352f608c3337 233 r |= (r >> 4);
mluis 1:352f608c3337 234 return (r + 1) >> 1;
mluis 1:352f608c3337 235 }
mluis 1:352f608c3337 236
mluis 1:352f608c3337 237 /* return the inverse of the finite field element x */
mluis 1:352f608c3337 238
mluis 1:352f608c3337 239 static uint8_t gf_inv(const uint8_t x)
mluis 1:352f608c3337 240 { uint8_t p1 = x, p2 = BPOLY, n1 = hibit(x), n2 = 0x80, v1 = 1, v2 = 0;
mluis 1:352f608c3337 241
mluis 5:1e9f6a365854 242 if(x < 2)
mluis 1:352f608c3337 243 return x;
mluis 1:352f608c3337 244
mluis 1:352f608c3337 245 for( ; ; )
mluis 1:352f608c3337 246 {
mluis 1:352f608c3337 247 if(n1)
mluis 1:352f608c3337 248 while(n2 >= n1) /* divide polynomial p2 by p1 */
mluis 1:352f608c3337 249 {
mluis 5:1e9f6a365854 250 n2 /= n1; /* shift smaller polynomial left */
mluis 1:352f608c3337 251 p2 ^= (p1 * n2) & 0xff; /* and remove from larger one */
mluis 5:1e9f6a365854 252 v2 ^= (v1 * n2); /* shift accumulated value and */
mluis 1:352f608c3337 253 n2 = hibit(p2); /* add into result */
mluis 1:352f608c3337 254 }
mluis 1:352f608c3337 255 else
mluis 1:352f608c3337 256 return v1;
mluis 1:352f608c3337 257
mluis 5:1e9f6a365854 258 if(n2) /* repeat with values swapped */
mluis 1:352f608c3337 259 while(n1 >= n2)
mluis 1:352f608c3337 260 {
mluis 5:1e9f6a365854 261 n1 /= n2;
mluis 5:1e9f6a365854 262 p1 ^= p2 * n1;
mluis 5:1e9f6a365854 263 v1 ^= v2 * n1;
mluis 1:352f608c3337 264 n1 = hibit(p1);
mluis 1:352f608c3337 265 }
mluis 1:352f608c3337 266 else
mluis 1:352f608c3337 267 return v2;
mluis 1:352f608c3337 268 }
mluis 1:352f608c3337 269 }
mluis 1:352f608c3337 270
mluis 1:352f608c3337 271 /* The forward and inverse affine transformations used in the S-box */
mluis 1:352f608c3337 272 uint8_t fwd_affine(const uint8_t x)
mluis 5:1e9f6a365854 273 {
mluis 1:352f608c3337 274 #if defined( HAVE_UINT_32T )
mluis 1:352f608c3337 275 uint32_t w = x;
mluis 1:352f608c3337 276 w ^= (w << 1) ^ (w << 2) ^ (w << 3) ^ (w << 4);
mluis 1:352f608c3337 277 return 0x63 ^ ((w ^ (w >> 8)) & 0xff);
mluis 1:352f608c3337 278 #else
mluis 5:1e9f6a365854 279 return 0x63 ^ x ^ (x << 1) ^ (x << 2) ^ (x << 3) ^ (x << 4)
mluis 1:352f608c3337 280 ^ (x >> 7) ^ (x >> 6) ^ (x >> 5) ^ (x >> 4);
mluis 1:352f608c3337 281 #endif
mluis 1:352f608c3337 282 }
mluis 1:352f608c3337 283
mluis 1:352f608c3337 284 uint8_t inv_affine(const uint8_t x)
mluis 1:352f608c3337 285 {
mluis 1:352f608c3337 286 #if defined( HAVE_UINT_32T )
mluis 1:352f608c3337 287 uint32_t w = x;
mluis 1:352f608c3337 288 w = (w << 1) ^ (w << 3) ^ (w << 6);
mluis 1:352f608c3337 289 return 0x05 ^ ((w ^ (w >> 8)) & 0xff);
mluis 1:352f608c3337 290 #else
mluis 5:1e9f6a365854 291 return 0x05 ^ (x << 1) ^ (x << 3) ^ (x << 6)
mluis 1:352f608c3337 292 ^ (x >> 7) ^ (x >> 5) ^ (x >> 2);
mluis 1:352f608c3337 293 #endif
mluis 1:352f608c3337 294 }
mluis 1:352f608c3337 295
mluis 1:352f608c3337 296 #define s_box(x) fwd_affine(gf_inv(x))
mluis 1:352f608c3337 297 #define is_box(x) gf_inv(inv_affine(x))
mluis 1:352f608c3337 298 #define gfm2_sb(x) f2(s_box(x))
mluis 1:352f608c3337 299 #define gfm3_sb(x) f3(s_box(x))
mluis 1:352f608c3337 300 #define gfm_9(x) f9(x)
mluis 1:352f608c3337 301 #define gfm_b(x) fb(x)
mluis 1:352f608c3337 302 #define gfm_d(x) fd(x)
mluis 1:352f608c3337 303 #define gfm_e(x) fe(x)
mluis 1:352f608c3337 304
mluis 1:352f608c3337 305 #endif
mluis 1:352f608c3337 306
mluis 1:352f608c3337 307 #if defined( HAVE_MEMCPY )
mluis 1:352f608c3337 308 # define block_copy_nn(d, s, l) memcpy(d, s, l)
mluis 1:352f608c3337 309 # define block_copy(d, s) memcpy(d, s, N_BLOCK)
mluis 1:352f608c3337 310 #else
mluis 1:352f608c3337 311 # define block_copy_nn(d, s, l) copy_block_nn(d, s, l)
mluis 1:352f608c3337 312 # define block_copy(d, s) copy_block(d, s)
mluis 1:352f608c3337 313 #endif
mluis 1:352f608c3337 314
mluis 1:352f608c3337 315 static void copy_block( void *d, const void *s )
mluis 1:352f608c3337 316 {
mluis 1:352f608c3337 317 #if defined( HAVE_UINT_32T )
mluis 1:352f608c3337 318 ((uint32_t*)d)[ 0] = ((uint32_t*)s)[ 0];
mluis 1:352f608c3337 319 ((uint32_t*)d)[ 1] = ((uint32_t*)s)[ 1];
mluis 1:352f608c3337 320 ((uint32_t*)d)[ 2] = ((uint32_t*)s)[ 2];
mluis 1:352f608c3337 321 ((uint32_t*)d)[ 3] = ((uint32_t*)s)[ 3];
mluis 1:352f608c3337 322 #else
mluis 1:352f608c3337 323 ((uint8_t*)d)[ 0] = ((uint8_t*)s)[ 0];
mluis 1:352f608c3337 324 ((uint8_t*)d)[ 1] = ((uint8_t*)s)[ 1];
mluis 1:352f608c3337 325 ((uint8_t*)d)[ 2] = ((uint8_t*)s)[ 2];
mluis 1:352f608c3337 326 ((uint8_t*)d)[ 3] = ((uint8_t*)s)[ 3];
mluis 1:352f608c3337 327 ((uint8_t*)d)[ 4] = ((uint8_t*)s)[ 4];
mluis 1:352f608c3337 328 ((uint8_t*)d)[ 5] = ((uint8_t*)s)[ 5];
mluis 1:352f608c3337 329 ((uint8_t*)d)[ 6] = ((uint8_t*)s)[ 6];
mluis 1:352f608c3337 330 ((uint8_t*)d)[ 7] = ((uint8_t*)s)[ 7];
mluis 1:352f608c3337 331 ((uint8_t*)d)[ 8] = ((uint8_t*)s)[ 8];
mluis 1:352f608c3337 332 ((uint8_t*)d)[ 9] = ((uint8_t*)s)[ 9];
mluis 1:352f608c3337 333 ((uint8_t*)d)[10] = ((uint8_t*)s)[10];
mluis 1:352f608c3337 334 ((uint8_t*)d)[11] = ((uint8_t*)s)[11];
mluis 1:352f608c3337 335 ((uint8_t*)d)[12] = ((uint8_t*)s)[12];
mluis 1:352f608c3337 336 ((uint8_t*)d)[13] = ((uint8_t*)s)[13];
mluis 1:352f608c3337 337 ((uint8_t*)d)[14] = ((uint8_t*)s)[14];
mluis 1:352f608c3337 338 ((uint8_t*)d)[15] = ((uint8_t*)s)[15];
mluis 1:352f608c3337 339 #endif
mluis 1:352f608c3337 340 }
mluis 1:352f608c3337 341
mluis 1:352f608c3337 342 static void copy_block_nn( uint8_t * d, const uint8_t *s, uint8_t nn )
mluis 1:352f608c3337 343 {
mluis 1:352f608c3337 344 while( nn-- )
mluis 1:352f608c3337 345 //*((uint8_t*)d)++ = *((uint8_t*)s)++;
mluis 1:352f608c3337 346 *d++ = *s++;
mluis 1:352f608c3337 347 }
mluis 1:352f608c3337 348
mluis 1:352f608c3337 349 static void xor_block( void *d, const void *s )
mluis 1:352f608c3337 350 {
mluis 1:352f608c3337 351 #if defined( HAVE_UINT_32T )
mluis 1:352f608c3337 352 ((uint32_t*)d)[ 0] ^= ((uint32_t*)s)[ 0];
mluis 1:352f608c3337 353 ((uint32_t*)d)[ 1] ^= ((uint32_t*)s)[ 1];
mluis 1:352f608c3337 354 ((uint32_t*)d)[ 2] ^= ((uint32_t*)s)[ 2];
mluis 1:352f608c3337 355 ((uint32_t*)d)[ 3] ^= ((uint32_t*)s)[ 3];
mluis 1:352f608c3337 356 #else
mluis 1:352f608c3337 357 ((uint8_t*)d)[ 0] ^= ((uint8_t*)s)[ 0];
mluis 1:352f608c3337 358 ((uint8_t*)d)[ 1] ^= ((uint8_t*)s)[ 1];
mluis 1:352f608c3337 359 ((uint8_t*)d)[ 2] ^= ((uint8_t*)s)[ 2];
mluis 1:352f608c3337 360 ((uint8_t*)d)[ 3] ^= ((uint8_t*)s)[ 3];
mluis 1:352f608c3337 361 ((uint8_t*)d)[ 4] ^= ((uint8_t*)s)[ 4];
mluis 1:352f608c3337 362 ((uint8_t*)d)[ 5] ^= ((uint8_t*)s)[ 5];
mluis 1:352f608c3337 363 ((uint8_t*)d)[ 6] ^= ((uint8_t*)s)[ 6];
mluis 1:352f608c3337 364 ((uint8_t*)d)[ 7] ^= ((uint8_t*)s)[ 7];
mluis 1:352f608c3337 365 ((uint8_t*)d)[ 8] ^= ((uint8_t*)s)[ 8];
mluis 1:352f608c3337 366 ((uint8_t*)d)[ 9] ^= ((uint8_t*)s)[ 9];
mluis 1:352f608c3337 367 ((uint8_t*)d)[10] ^= ((uint8_t*)s)[10];
mluis 1:352f608c3337 368 ((uint8_t*)d)[11] ^= ((uint8_t*)s)[11];
mluis 1:352f608c3337 369 ((uint8_t*)d)[12] ^= ((uint8_t*)s)[12];
mluis 1:352f608c3337 370 ((uint8_t*)d)[13] ^= ((uint8_t*)s)[13];
mluis 1:352f608c3337 371 ((uint8_t*)d)[14] ^= ((uint8_t*)s)[14];
mluis 1:352f608c3337 372 ((uint8_t*)d)[15] ^= ((uint8_t*)s)[15];
mluis 1:352f608c3337 373 #endif
mluis 1:352f608c3337 374 }
mluis 1:352f608c3337 375
mluis 1:352f608c3337 376 static void copy_and_key( void *d, const void *s, const void *k )
mluis 1:352f608c3337 377 {
mluis 1:352f608c3337 378 #if defined( HAVE_UINT_32T )
mluis 1:352f608c3337 379 ((uint32_t*)d)[ 0] = ((uint32_t*)s)[ 0] ^ ((uint32_t*)k)[ 0];
mluis 1:352f608c3337 380 ((uint32_t*)d)[ 1] = ((uint32_t*)s)[ 1] ^ ((uint32_t*)k)[ 1];
mluis 1:352f608c3337 381 ((uint32_t*)d)[ 2] = ((uint32_t*)s)[ 2] ^ ((uint32_t*)k)[ 2];
mluis 1:352f608c3337 382 ((uint32_t*)d)[ 3] = ((uint32_t*)s)[ 3] ^ ((uint32_t*)k)[ 3];
mluis 1:352f608c3337 383 #elif 1
mluis 1:352f608c3337 384 ((uint8_t*)d)[ 0] = ((uint8_t*)s)[ 0] ^ ((uint8_t*)k)[ 0];
mluis 1:352f608c3337 385 ((uint8_t*)d)[ 1] = ((uint8_t*)s)[ 1] ^ ((uint8_t*)k)[ 1];
mluis 1:352f608c3337 386 ((uint8_t*)d)[ 2] = ((uint8_t*)s)[ 2] ^ ((uint8_t*)k)[ 2];
mluis 1:352f608c3337 387 ((uint8_t*)d)[ 3] = ((uint8_t*)s)[ 3] ^ ((uint8_t*)k)[ 3];
mluis 1:352f608c3337 388 ((uint8_t*)d)[ 4] = ((uint8_t*)s)[ 4] ^ ((uint8_t*)k)[ 4];
mluis 1:352f608c3337 389 ((uint8_t*)d)[ 5] = ((uint8_t*)s)[ 5] ^ ((uint8_t*)k)[ 5];
mluis 1:352f608c3337 390 ((uint8_t*)d)[ 6] = ((uint8_t*)s)[ 6] ^ ((uint8_t*)k)[ 6];
mluis 1:352f608c3337 391 ((uint8_t*)d)[ 7] = ((uint8_t*)s)[ 7] ^ ((uint8_t*)k)[ 7];
mluis 1:352f608c3337 392 ((uint8_t*)d)[ 8] = ((uint8_t*)s)[ 8] ^ ((uint8_t*)k)[ 8];
mluis 1:352f608c3337 393 ((uint8_t*)d)[ 9] = ((uint8_t*)s)[ 9] ^ ((uint8_t*)k)[ 9];
mluis 1:352f608c3337 394 ((uint8_t*)d)[10] = ((uint8_t*)s)[10] ^ ((uint8_t*)k)[10];
mluis 1:352f608c3337 395 ((uint8_t*)d)[11] = ((uint8_t*)s)[11] ^ ((uint8_t*)k)[11];
mluis 1:352f608c3337 396 ((uint8_t*)d)[12] = ((uint8_t*)s)[12] ^ ((uint8_t*)k)[12];
mluis 1:352f608c3337 397 ((uint8_t*)d)[13] = ((uint8_t*)s)[13] ^ ((uint8_t*)k)[13];
mluis 1:352f608c3337 398 ((uint8_t*)d)[14] = ((uint8_t*)s)[14] ^ ((uint8_t*)k)[14];
mluis 1:352f608c3337 399 ((uint8_t*)d)[15] = ((uint8_t*)s)[15] ^ ((uint8_t*)k)[15];
mluis 1:352f608c3337 400 #else
mluis 1:352f608c3337 401 block_copy(d, s);
mluis 1:352f608c3337 402 xor_block(d, k);
mluis 1:352f608c3337 403 #endif
mluis 1:352f608c3337 404 }
mluis 1:352f608c3337 405
mluis 1:352f608c3337 406 static void add_round_key( uint8_t d[N_BLOCK], const uint8_t k[N_BLOCK] )
mluis 1:352f608c3337 407 {
mluis 1:352f608c3337 408 xor_block(d, k);
mluis 1:352f608c3337 409 }
mluis 1:352f608c3337 410
mluis 1:352f608c3337 411 static void shift_sub_rows( uint8_t st[N_BLOCK] )
mluis 1:352f608c3337 412 { uint8_t tt;
mluis 1:352f608c3337 413
mluis 1:352f608c3337 414 st[ 0] = s_box(st[ 0]); st[ 4] = s_box(st[ 4]);
mluis 1:352f608c3337 415 st[ 8] = s_box(st[ 8]); st[12] = s_box(st[12]);
mluis 1:352f608c3337 416
mluis 1:352f608c3337 417 tt = st[1]; st[ 1] = s_box(st[ 5]); st[ 5] = s_box(st[ 9]);
mluis 1:352f608c3337 418 st[ 9] = s_box(st[13]); st[13] = s_box( tt );
mluis 1:352f608c3337 419
mluis 1:352f608c3337 420 tt = st[2]; st[ 2] = s_box(st[10]); st[10] = s_box( tt );
mluis 1:352f608c3337 421 tt = st[6]; st[ 6] = s_box(st[14]); st[14] = s_box( tt );
mluis 1:352f608c3337 422
mluis 1:352f608c3337 423 tt = st[15]; st[15] = s_box(st[11]); st[11] = s_box(st[ 7]);
mluis 1:352f608c3337 424 st[ 7] = s_box(st[ 3]); st[ 3] = s_box( tt );
mluis 1:352f608c3337 425 }
mluis 1:352f608c3337 426
mluis 1:352f608c3337 427 #if defined( AES_DEC_PREKEYED )
mluis 1:352f608c3337 428
mluis 1:352f608c3337 429 static void inv_shift_sub_rows( uint8_t st[N_BLOCK] )
mluis 1:352f608c3337 430 { uint8_t tt;
mluis 1:352f608c3337 431
mluis 1:352f608c3337 432 st[ 0] = is_box(st[ 0]); st[ 4] = is_box(st[ 4]);
mluis 1:352f608c3337 433 st[ 8] = is_box(st[ 8]); st[12] = is_box(st[12]);
mluis 1:352f608c3337 434
mluis 1:352f608c3337 435 tt = st[13]; st[13] = is_box(st[9]); st[ 9] = is_box(st[5]);
mluis 1:352f608c3337 436 st[ 5] = is_box(st[1]); st[ 1] = is_box( tt );
mluis 1:352f608c3337 437
mluis 1:352f608c3337 438 tt = st[2]; st[ 2] = is_box(st[10]); st[10] = is_box( tt );
mluis 1:352f608c3337 439 tt = st[6]; st[ 6] = is_box(st[14]); st[14] = is_box( tt );
mluis 1:352f608c3337 440
mluis 1:352f608c3337 441 tt = st[3]; st[ 3] = is_box(st[ 7]); st[ 7] = is_box(st[11]);
mluis 1:352f608c3337 442 st[11] = is_box(st[15]); st[15] = is_box( tt );
mluis 1:352f608c3337 443 }
mluis 1:352f608c3337 444
mluis 1:352f608c3337 445 #endif
mluis 1:352f608c3337 446
mluis 1:352f608c3337 447 #if defined( VERSION_1 )
mluis 1:352f608c3337 448 static void mix_sub_columns( uint8_t dt[N_BLOCK] )
mluis 1:352f608c3337 449 { uint8_t st[N_BLOCK];
mluis 1:352f608c3337 450 block_copy(st, dt);
mluis 1:352f608c3337 451 #else
mluis 1:352f608c3337 452 static void mix_sub_columns( uint8_t dt[N_BLOCK], uint8_t st[N_BLOCK] )
mluis 1:352f608c3337 453 {
mluis 1:352f608c3337 454 #endif
mluis 1:352f608c3337 455 dt[ 0] = gfm2_sb(st[0]) ^ gfm3_sb(st[5]) ^ s_box(st[10]) ^ s_box(st[15]);
mluis 1:352f608c3337 456 dt[ 1] = s_box(st[0]) ^ gfm2_sb(st[5]) ^ gfm3_sb(st[10]) ^ s_box(st[15]);
mluis 1:352f608c3337 457 dt[ 2] = s_box(st[0]) ^ s_box(st[5]) ^ gfm2_sb(st[10]) ^ gfm3_sb(st[15]);
mluis 1:352f608c3337 458 dt[ 3] = gfm3_sb(st[0]) ^ s_box(st[5]) ^ s_box(st[10]) ^ gfm2_sb(st[15]);
mluis 1:352f608c3337 459
mluis 1:352f608c3337 460 dt[ 4] = gfm2_sb(st[4]) ^ gfm3_sb(st[9]) ^ s_box(st[14]) ^ s_box(st[3]);
mluis 1:352f608c3337 461 dt[ 5] = s_box(st[4]) ^ gfm2_sb(st[9]) ^ gfm3_sb(st[14]) ^ s_box(st[3]);
mluis 1:352f608c3337 462 dt[ 6] = s_box(st[4]) ^ s_box(st[9]) ^ gfm2_sb(st[14]) ^ gfm3_sb(st[3]);
mluis 1:352f608c3337 463 dt[ 7] = gfm3_sb(st[4]) ^ s_box(st[9]) ^ s_box(st[14]) ^ gfm2_sb(st[3]);
mluis 1:352f608c3337 464
mluis 1:352f608c3337 465 dt[ 8] = gfm2_sb(st[8]) ^ gfm3_sb(st[13]) ^ s_box(st[2]) ^ s_box(st[7]);
mluis 1:352f608c3337 466 dt[ 9] = s_box(st[8]) ^ gfm2_sb(st[13]) ^ gfm3_sb(st[2]) ^ s_box(st[7]);
mluis 1:352f608c3337 467 dt[10] = s_box(st[8]) ^ s_box(st[13]) ^ gfm2_sb(st[2]) ^ gfm3_sb(st[7]);
mluis 1:352f608c3337 468 dt[11] = gfm3_sb(st[8]) ^ s_box(st[13]) ^ s_box(st[2]) ^ gfm2_sb(st[7]);
mluis 1:352f608c3337 469
mluis 1:352f608c3337 470 dt[12] = gfm2_sb(st[12]) ^ gfm3_sb(st[1]) ^ s_box(st[6]) ^ s_box(st[11]);
mluis 1:352f608c3337 471 dt[13] = s_box(st[12]) ^ gfm2_sb(st[1]) ^ gfm3_sb(st[6]) ^ s_box(st[11]);
mluis 1:352f608c3337 472 dt[14] = s_box(st[12]) ^ s_box(st[1]) ^ gfm2_sb(st[6]) ^ gfm3_sb(st[11]);
mluis 1:352f608c3337 473 dt[15] = gfm3_sb(st[12]) ^ s_box(st[1]) ^ s_box(st[6]) ^ gfm2_sb(st[11]);
mluis 1:352f608c3337 474 }
mluis 1:352f608c3337 475
mluis 1:352f608c3337 476 #if defined( AES_DEC_PREKEYED )
mluis 1:352f608c3337 477
mluis 1:352f608c3337 478 #if defined( VERSION_1 )
mluis 1:352f608c3337 479 static void inv_mix_sub_columns( uint8_t dt[N_BLOCK] )
mluis 1:352f608c3337 480 { uint8_t st[N_BLOCK];
mluis 1:352f608c3337 481 block_copy(st, dt);
mluis 1:352f608c3337 482 #else
mluis 1:352f608c3337 483 static void inv_mix_sub_columns( uint8_t dt[N_BLOCK], uint8_t st[N_BLOCK] )
mluis 1:352f608c3337 484 {
mluis 1:352f608c3337 485 #endif
mluis 1:352f608c3337 486 dt[ 0] = is_box(gfm_e(st[ 0]) ^ gfm_b(st[ 1]) ^ gfm_d(st[ 2]) ^ gfm_9(st[ 3]));
mluis 1:352f608c3337 487 dt[ 5] = is_box(gfm_9(st[ 0]) ^ gfm_e(st[ 1]) ^ gfm_b(st[ 2]) ^ gfm_d(st[ 3]));
mluis 1:352f608c3337 488 dt[10] = is_box(gfm_d(st[ 0]) ^ gfm_9(st[ 1]) ^ gfm_e(st[ 2]) ^ gfm_b(st[ 3]));
mluis 1:352f608c3337 489 dt[15] = is_box(gfm_b(st[ 0]) ^ gfm_d(st[ 1]) ^ gfm_9(st[ 2]) ^ gfm_e(st[ 3]));
mluis 1:352f608c3337 490
mluis 1:352f608c3337 491 dt[ 4] = is_box(gfm_e(st[ 4]) ^ gfm_b(st[ 5]) ^ gfm_d(st[ 6]) ^ gfm_9(st[ 7]));
mluis 1:352f608c3337 492 dt[ 9] = is_box(gfm_9(st[ 4]) ^ gfm_e(st[ 5]) ^ gfm_b(st[ 6]) ^ gfm_d(st[ 7]));
mluis 1:352f608c3337 493 dt[14] = is_box(gfm_d(st[ 4]) ^ gfm_9(st[ 5]) ^ gfm_e(st[ 6]) ^ gfm_b(st[ 7]));
mluis 1:352f608c3337 494 dt[ 3] = is_box(gfm_b(st[ 4]) ^ gfm_d(st[ 5]) ^ gfm_9(st[ 6]) ^ gfm_e(st[ 7]));
mluis 1:352f608c3337 495
mluis 1:352f608c3337 496 dt[ 8] = is_box(gfm_e(st[ 8]) ^ gfm_b(st[ 9]) ^ gfm_d(st[10]) ^ gfm_9(st[11]));
mluis 1:352f608c3337 497 dt[13] = is_box(gfm_9(st[ 8]) ^ gfm_e(st[ 9]) ^ gfm_b(st[10]) ^ gfm_d(st[11]));
mluis 1:352f608c3337 498 dt[ 2] = is_box(gfm_d(st[ 8]) ^ gfm_9(st[ 9]) ^ gfm_e(st[10]) ^ gfm_b(st[11]));
mluis 1:352f608c3337 499 dt[ 7] = is_box(gfm_b(st[ 8]) ^ gfm_d(st[ 9]) ^ gfm_9(st[10]) ^ gfm_e(st[11]));
mluis 1:352f608c3337 500
mluis 1:352f608c3337 501 dt[12] = is_box(gfm_e(st[12]) ^ gfm_b(st[13]) ^ gfm_d(st[14]) ^ gfm_9(st[15]));
mluis 1:352f608c3337 502 dt[ 1] = is_box(gfm_9(st[12]) ^ gfm_e(st[13]) ^ gfm_b(st[14]) ^ gfm_d(st[15]));
mluis 1:352f608c3337 503 dt[ 6] = is_box(gfm_d(st[12]) ^ gfm_9(st[13]) ^ gfm_e(st[14]) ^ gfm_b(st[15]));
mluis 1:352f608c3337 504 dt[11] = is_box(gfm_b(st[12]) ^ gfm_d(st[13]) ^ gfm_9(st[14]) ^ gfm_e(st[15]));
mluis 1:352f608c3337 505 }
mluis 1:352f608c3337 506
mluis 1:352f608c3337 507 #endif
mluis 1:352f608c3337 508
mluis 1:352f608c3337 509 #if defined( AES_ENC_PREKEYED ) || defined( AES_DEC_PREKEYED )
mluis 1:352f608c3337 510
mluis 1:352f608c3337 511 /* Set the cipher key for the pre-keyed version */
mluis 1:352f608c3337 512
mluis 1:352f608c3337 513 return_type aes_set_key( const uint8_t key[], length_type keylen, aes_context ctx[1] )
mluis 1:352f608c3337 514 {
mluis 1:352f608c3337 515 uint8_t cc, rc, hi;
mluis 1:352f608c3337 516
mluis 1:352f608c3337 517 switch( keylen )
mluis 1:352f608c3337 518 {
mluis 1:352f608c3337 519 case 16:
mluis 1:352f608c3337 520 case 24:
mluis 1:352f608c3337 521 case 32:
mluis 1:352f608c3337 522 break;
mluis 5:1e9f6a365854 523 default:
mluis 5:1e9f6a365854 524 ctx->rnd = 0;
mluis 1:352f608c3337 525 return ( uint8_t )-1;
mluis 1:352f608c3337 526 }
mluis 1:352f608c3337 527 block_copy_nn(ctx->ksch, key, keylen);
mluis 1:352f608c3337 528 hi = (keylen + 28) << 2;
mluis 1:352f608c3337 529 ctx->rnd = (hi >> 4) - 1;
mluis 1:352f608c3337 530 for( cc = keylen, rc = 1; cc < hi; cc += 4 )
mluis 1:352f608c3337 531 { uint8_t tt, t0, t1, t2, t3;
mluis 1:352f608c3337 532
mluis 1:352f608c3337 533 t0 = ctx->ksch[cc - 4];
mluis 1:352f608c3337 534 t1 = ctx->ksch[cc - 3];
mluis 1:352f608c3337 535 t2 = ctx->ksch[cc - 2];
mluis 1:352f608c3337 536 t3 = ctx->ksch[cc - 1];
mluis 1:352f608c3337 537 if( cc % keylen == 0 )
mluis 1:352f608c3337 538 {
mluis 1:352f608c3337 539 tt = t0;
mluis 1:352f608c3337 540 t0 = s_box(t1) ^ rc;
mluis 1:352f608c3337 541 t1 = s_box(t2);
mluis 1:352f608c3337 542 t2 = s_box(t3);
mluis 1:352f608c3337 543 t3 = s_box(tt);
mluis 1:352f608c3337 544 rc = f2(rc);
mluis 1:352f608c3337 545 }
mluis 1:352f608c3337 546 else if( keylen > 24 && cc % keylen == 16 )
mluis 1:352f608c3337 547 {
mluis 1:352f608c3337 548 t0 = s_box(t0);
mluis 1:352f608c3337 549 t1 = s_box(t1);
mluis 1:352f608c3337 550 t2 = s_box(t2);
mluis 1:352f608c3337 551 t3 = s_box(t3);
mluis 1:352f608c3337 552 }
mluis 1:352f608c3337 553 tt = cc - keylen;
mluis 1:352f608c3337 554 ctx->ksch[cc + 0] = ctx->ksch[tt + 0] ^ t0;
mluis 1:352f608c3337 555 ctx->ksch[cc + 1] = ctx->ksch[tt + 1] ^ t1;
mluis 1:352f608c3337 556 ctx->ksch[cc + 2] = ctx->ksch[tt + 2] ^ t2;
mluis 1:352f608c3337 557 ctx->ksch[cc + 3] = ctx->ksch[tt + 3] ^ t3;
mluis 1:352f608c3337 558 }
mluis 1:352f608c3337 559 return 0;
mluis 1:352f608c3337 560 }
mluis 1:352f608c3337 561
mluis 1:352f608c3337 562 #endif
mluis 1:352f608c3337 563
mluis 1:352f608c3337 564 #if defined( AES_ENC_PREKEYED )
mluis 1:352f608c3337 565
mluis 1:352f608c3337 566 /* Encrypt a single block of 16 bytes */
mluis 1:352f608c3337 567
mluis 1:352f608c3337 568 return_type aes_encrypt( const uint8_t in[N_BLOCK], uint8_t out[N_BLOCK], const aes_context ctx[1] )
mluis 1:352f608c3337 569 {
mluis 1:352f608c3337 570 if( ctx->rnd )
mluis 1:352f608c3337 571 {
mluis 1:352f608c3337 572 uint8_t s1[N_BLOCK], r;
mluis 1:352f608c3337 573 copy_and_key( s1, in, ctx->ksch );
mluis 1:352f608c3337 574
mluis 1:352f608c3337 575 for( r = 1 ; r < ctx->rnd ; ++r )
mluis 1:352f608c3337 576 #if defined( VERSION_1 )
mluis 1:352f608c3337 577 {
mluis 1:352f608c3337 578 mix_sub_columns( s1 );
mluis 1:352f608c3337 579 add_round_key( s1, ctx->ksch + r * N_BLOCK);
mluis 1:352f608c3337 580 }
mluis 1:352f608c3337 581 #else
mluis 1:352f608c3337 582 { uint8_t s2[N_BLOCK];
mluis 1:352f608c3337 583 mix_sub_columns( s2, s1 );
mluis 1:352f608c3337 584 copy_and_key( s1, s2, ctx->ksch + r * N_BLOCK);
mluis 1:352f608c3337 585 }
mluis 1:352f608c3337 586 #endif
mluis 1:352f608c3337 587 shift_sub_rows( s1 );
mluis 1:352f608c3337 588 copy_and_key( out, s1, ctx->ksch + r * N_BLOCK );
mluis 1:352f608c3337 589 }
mluis 1:352f608c3337 590 else
mluis 1:352f608c3337 591 return ( uint8_t )-1;
mluis 1:352f608c3337 592 return 0;
mluis 1:352f608c3337 593 }
mluis 1:352f608c3337 594
mluis 1:352f608c3337 595 /* CBC encrypt a number of blocks (input and return an IV) */
mluis 1:352f608c3337 596
mluis 1:352f608c3337 597 return_type aes_cbc_encrypt( const uint8_t *in, uint8_t *out,
mluis 1:352f608c3337 598 int32_t n_block, uint8_t iv[N_BLOCK], const aes_context ctx[1] )
mluis 1:352f608c3337 599 {
mluis 1:352f608c3337 600
mluis 1:352f608c3337 601 while(n_block--)
mluis 1:352f608c3337 602 {
mluis 1:352f608c3337 603 xor_block(iv, in);
mluis 1:352f608c3337 604 if(aes_encrypt(iv, iv, ctx) != EXIT_SUCCESS)
mluis 1:352f608c3337 605 return EXIT_FAILURE;
mluis 1:352f608c3337 606 //memcpy(out, iv, N_BLOCK);
mluis 1:352f608c3337 607 block_copy(out, iv);
mluis 1:352f608c3337 608 in += N_BLOCK;
mluis 1:352f608c3337 609 out += N_BLOCK;
mluis 1:352f608c3337 610 }
mluis 1:352f608c3337 611 return EXIT_SUCCESS;
mluis 1:352f608c3337 612 }
mluis 1:352f608c3337 613
mluis 1:352f608c3337 614 #endif
mluis 1:352f608c3337 615
mluis 1:352f608c3337 616 #if defined( AES_DEC_PREKEYED )
mluis 1:352f608c3337 617
mluis 1:352f608c3337 618 /* Decrypt a single block of 16 bytes */
mluis 1:352f608c3337 619
mluis 1:352f608c3337 620 return_type aes_decrypt( const uint8_t in[N_BLOCK], uint8_t out[N_BLOCK], const aes_context ctx[1] )
mluis 1:352f608c3337 621 {
mluis 1:352f608c3337 622 if( ctx->rnd )
mluis 1:352f608c3337 623 {
mluis 1:352f608c3337 624 uint8_t s1[N_BLOCK], r;
mluis 1:352f608c3337 625 copy_and_key( s1, in, ctx->ksch + ctx->rnd * N_BLOCK );
mluis 1:352f608c3337 626 inv_shift_sub_rows( s1 );
mluis 1:352f608c3337 627
mluis 1:352f608c3337 628 for( r = ctx->rnd ; --r ; )
mluis 1:352f608c3337 629 #if defined( VERSION_1 )
mluis 1:352f608c3337 630 {
mluis 1:352f608c3337 631 add_round_key( s1, ctx->ksch + r * N_BLOCK );
mluis 1:352f608c3337 632 inv_mix_sub_columns( s1 );
mluis 1:352f608c3337 633 }
mluis 1:352f608c3337 634 #else
mluis 1:352f608c3337 635 { uint8_t s2[N_BLOCK];
mluis 1:352f608c3337 636 copy_and_key( s2, s1, ctx->ksch + r * N_BLOCK );
mluis 1:352f608c3337 637 inv_mix_sub_columns( s1, s2 );
mluis 1:352f608c3337 638 }
mluis 1:352f608c3337 639 #endif
mluis 1:352f608c3337 640 copy_and_key( out, s1, ctx->ksch );
mluis 1:352f608c3337 641 }
mluis 1:352f608c3337 642 else
mluis 1:352f608c3337 643 return -1;
mluis 1:352f608c3337 644 return 0;
mluis 1:352f608c3337 645 }
mluis 1:352f608c3337 646
mluis 1:352f608c3337 647 /* CBC decrypt a number of blocks (input and return an IV) */
mluis 1:352f608c3337 648
mluis 1:352f608c3337 649 return_type aes_cbc_decrypt( const uint8_t *in, uint8_t *out,
mluis 1:352f608c3337 650 int32_t n_block, uint8_t iv[N_BLOCK], const aes_context ctx[1] )
mluis 5:1e9f6a365854 651 {
mluis 1:352f608c3337 652 while(n_block--)
mluis 1:352f608c3337 653 { uint8_t tmp[N_BLOCK];
mluis 5:1e9f6a365854 654
mluis 1:352f608c3337 655 //memcpy(tmp, in, N_BLOCK);
mluis 1:352f608c3337 656 block_copy(tmp, in);
mluis 1:352f608c3337 657 if(aes_decrypt(in, out, ctx) != EXIT_SUCCESS)
mluis 1:352f608c3337 658 return EXIT_FAILURE;
mluis 1:352f608c3337 659 xor_block(out, iv);
mluis 1:352f608c3337 660 //memcpy(iv, tmp, N_BLOCK);
mluis 1:352f608c3337 661 block_copy(iv, tmp);
mluis 1:352f608c3337 662 in += N_BLOCK;
mluis 1:352f608c3337 663 out += N_BLOCK;
mluis 1:352f608c3337 664 }
mluis 1:352f608c3337 665 return EXIT_SUCCESS;
mluis 1:352f608c3337 666 }
mluis 1:352f608c3337 667
mluis 1:352f608c3337 668 #endif
mluis 1:352f608c3337 669
mluis 1:352f608c3337 670 #if defined( AES_ENC_128_OTFK )
mluis 1:352f608c3337 671
mluis 1:352f608c3337 672 /* The 'on the fly' encryption key update for for 128 bit keys */
mluis 1:352f608c3337 673
mluis 1:352f608c3337 674 static void update_encrypt_key_128( uint8_t k[N_BLOCK], uint8_t *rc )
mluis 1:352f608c3337 675 { uint8_t cc;
mluis 1:352f608c3337 676
mluis 1:352f608c3337 677 k[0] ^= s_box(k[13]) ^ *rc;
mluis 1:352f608c3337 678 k[1] ^= s_box(k[14]);
mluis 1:352f608c3337 679 k[2] ^= s_box(k[15]);
mluis 1:352f608c3337 680 k[3] ^= s_box(k[12]);
mluis 1:352f608c3337 681 *rc = f2( *rc );
mluis 1:352f608c3337 682
mluis 1:352f608c3337 683 for(cc = 4; cc < 16; cc += 4 )
mluis 1:352f608c3337 684 {
mluis 1:352f608c3337 685 k[cc + 0] ^= k[cc - 4];
mluis 1:352f608c3337 686 k[cc + 1] ^= k[cc - 3];
mluis 1:352f608c3337 687 k[cc + 2] ^= k[cc - 2];
mluis 1:352f608c3337 688 k[cc + 3] ^= k[cc - 1];
mluis 1:352f608c3337 689 }
mluis 1:352f608c3337 690 }
mluis 1:352f608c3337 691
mluis 1:352f608c3337 692 /* Encrypt a single block of 16 bytes with 'on the fly' 128 bit keying */
mluis 1:352f608c3337 693
mluis 1:352f608c3337 694 void aes_encrypt_128( const uint8_t in[N_BLOCK], uint8_t out[N_BLOCK],
mluis 1:352f608c3337 695 const uint8_t key[N_BLOCK], uint8_t o_key[N_BLOCK] )
mluis 1:352f608c3337 696 { uint8_t s1[N_BLOCK], r, rc = 1;
mluis 1:352f608c3337 697
mluis 1:352f608c3337 698 if(o_key != key)
mluis 1:352f608c3337 699 block_copy( o_key, key );
mluis 1:352f608c3337 700 copy_and_key( s1, in, o_key );
mluis 1:352f608c3337 701
mluis 1:352f608c3337 702 for( r = 1 ; r < 10 ; ++r )
mluis 1:352f608c3337 703 #if defined( VERSION_1 )
mluis 1:352f608c3337 704 {
mluis 1:352f608c3337 705 mix_sub_columns( s1 );
mluis 1:352f608c3337 706 update_encrypt_key_128( o_key, &rc );
mluis 1:352f608c3337 707 add_round_key( s1, o_key );
mluis 1:352f608c3337 708 }
mluis 1:352f608c3337 709 #else
mluis 1:352f608c3337 710 { uint8_t s2[N_BLOCK];
mluis 1:352f608c3337 711 mix_sub_columns( s2, s1 );
mluis 1:352f608c3337 712 update_encrypt_key_128( o_key, &rc );
mluis 1:352f608c3337 713 copy_and_key( s1, s2, o_key );
mluis 1:352f608c3337 714 }
mluis 1:352f608c3337 715 #endif
mluis 1:352f608c3337 716
mluis 1:352f608c3337 717 shift_sub_rows( s1 );
mluis 1:352f608c3337 718 update_encrypt_key_128( o_key, &rc );
mluis 1:352f608c3337 719 copy_and_key( out, s1, o_key );
mluis 1:352f608c3337 720 }
mluis 1:352f608c3337 721
mluis 1:352f608c3337 722 #endif
mluis 1:352f608c3337 723
mluis 1:352f608c3337 724 #if defined( AES_DEC_128_OTFK )
mluis 1:352f608c3337 725
mluis 1:352f608c3337 726 /* The 'on the fly' decryption key update for for 128 bit keys */
mluis 1:352f608c3337 727
mluis 1:352f608c3337 728 static void update_decrypt_key_128( uint8_t k[N_BLOCK], uint8_t *rc )
mluis 1:352f608c3337 729 { uint8_t cc;
mluis 1:352f608c3337 730
mluis 1:352f608c3337 731 for( cc = 12; cc > 0; cc -= 4 )
mluis 1:352f608c3337 732 {
mluis 1:352f608c3337 733 k[cc + 0] ^= k[cc - 4];
mluis 1:352f608c3337 734 k[cc + 1] ^= k[cc - 3];
mluis 1:352f608c3337 735 k[cc + 2] ^= k[cc - 2];
mluis 1:352f608c3337 736 k[cc + 3] ^= k[cc - 1];
mluis 1:352f608c3337 737 }
mluis 1:352f608c3337 738 *rc = d2(*rc);
mluis 1:352f608c3337 739 k[0] ^= s_box(k[13]) ^ *rc;
mluis 1:352f608c3337 740 k[1] ^= s_box(k[14]);
mluis 1:352f608c3337 741 k[2] ^= s_box(k[15]);
mluis 1:352f608c3337 742 k[3] ^= s_box(k[12]);
mluis 1:352f608c3337 743 }
mluis 1:352f608c3337 744
mluis 1:352f608c3337 745 /* Decrypt a single block of 16 bytes with 'on the fly' 128 bit keying */
mluis 1:352f608c3337 746
mluis 1:352f608c3337 747 void aes_decrypt_128( const uint8_t in[N_BLOCK], uint8_t out[N_BLOCK],
mluis 1:352f608c3337 748 const uint8_t key[N_BLOCK], uint8_t o_key[N_BLOCK] )
mluis 1:352f608c3337 749 {
mluis 1:352f608c3337 750 uint8_t s1[N_BLOCK], r, rc = 0x6c;
mluis 1:352f608c3337 751 if(o_key != key)
mluis 1:352f608c3337 752 block_copy( o_key, key );
mluis 1:352f608c3337 753
mluis 1:352f608c3337 754 copy_and_key( s1, in, o_key );
mluis 1:352f608c3337 755 inv_shift_sub_rows( s1 );
mluis 1:352f608c3337 756
mluis 1:352f608c3337 757 for( r = 10 ; --r ; )
mluis 1:352f608c3337 758 #if defined( VERSION_1 )
mluis 1:352f608c3337 759 {
mluis 1:352f608c3337 760 update_decrypt_key_128( o_key, &rc );
mluis 1:352f608c3337 761 add_round_key( s1, o_key );
mluis 1:352f608c3337 762 inv_mix_sub_columns( s1 );
mluis 1:352f608c3337 763 }
mluis 1:352f608c3337 764 #else
mluis 1:352f608c3337 765 { uint8_t s2[N_BLOCK];
mluis 1:352f608c3337 766 update_decrypt_key_128( o_key, &rc );
mluis 1:352f608c3337 767 copy_and_key( s2, s1, o_key );
mluis 1:352f608c3337 768 inv_mix_sub_columns( s1, s2 );
mluis 1:352f608c3337 769 }
mluis 1:352f608c3337 770 #endif
mluis 1:352f608c3337 771 update_decrypt_key_128( o_key, &rc );
mluis 1:352f608c3337 772 copy_and_key( out, s1, o_key );
mluis 1:352f608c3337 773 }
mluis 1:352f608c3337 774
mluis 1:352f608c3337 775 #endif
mluis 1:352f608c3337 776
mluis 1:352f608c3337 777 #if defined( AES_ENC_256_OTFK )
mluis 1:352f608c3337 778
mluis 1:352f608c3337 779 /* The 'on the fly' encryption key update for for 256 bit keys */
mluis 1:352f608c3337 780
mluis 1:352f608c3337 781 static void update_encrypt_key_256( uint8_t k[2 * N_BLOCK], uint8_t *rc )
mluis 1:352f608c3337 782 { uint8_t cc;
mluis 1:352f608c3337 783
mluis 1:352f608c3337 784 k[0] ^= s_box(k[29]) ^ *rc;
mluis 1:352f608c3337 785 k[1] ^= s_box(k[30]);
mluis 1:352f608c3337 786 k[2] ^= s_box(k[31]);
mluis 1:352f608c3337 787 k[3] ^= s_box(k[28]);
mluis 1:352f608c3337 788 *rc = f2( *rc );
mluis 1:352f608c3337 789
mluis 1:352f608c3337 790 for(cc = 4; cc < 16; cc += 4)
mluis 1:352f608c3337 791 {
mluis 1:352f608c3337 792 k[cc + 0] ^= k[cc - 4];
mluis 1:352f608c3337 793 k[cc + 1] ^= k[cc - 3];
mluis 1:352f608c3337 794 k[cc + 2] ^= k[cc - 2];
mluis 1:352f608c3337 795 k[cc + 3] ^= k[cc - 1];
mluis 1:352f608c3337 796 }
mluis 1:352f608c3337 797
mluis 1:352f608c3337 798 k[16] ^= s_box(k[12]);
mluis 1:352f608c3337 799 k[17] ^= s_box(k[13]);
mluis 1:352f608c3337 800 k[18] ^= s_box(k[14]);
mluis 1:352f608c3337 801 k[19] ^= s_box(k[15]);
mluis 1:352f608c3337 802
mluis 1:352f608c3337 803 for( cc = 20; cc < 32; cc += 4 )
mluis 1:352f608c3337 804 {
mluis 1:352f608c3337 805 k[cc + 0] ^= k[cc - 4];
mluis 1:352f608c3337 806 k[cc + 1] ^= k[cc - 3];
mluis 1:352f608c3337 807 k[cc + 2] ^= k[cc - 2];
mluis 1:352f608c3337 808 k[cc + 3] ^= k[cc - 1];
mluis 1:352f608c3337 809 }
mluis 1:352f608c3337 810 }
mluis 1:352f608c3337 811
mluis 1:352f608c3337 812 /* Encrypt a single block of 16 bytes with 'on the fly' 256 bit keying */
mluis 1:352f608c3337 813
mluis 1:352f608c3337 814 void aes_encrypt_256( const uint8_t in[N_BLOCK], uint8_t out[N_BLOCK],
mluis 1:352f608c3337 815 const uint8_t key[2 * N_BLOCK], uint8_t o_key[2 * N_BLOCK] )
mluis 1:352f608c3337 816 {
mluis 1:352f608c3337 817 uint8_t s1[N_BLOCK], r, rc = 1;
mluis 1:352f608c3337 818 if(o_key != key)
mluis 1:352f608c3337 819 {
mluis 1:352f608c3337 820 block_copy( o_key, key );
mluis 1:352f608c3337 821 block_copy( o_key + 16, key + 16 );
mluis 1:352f608c3337 822 }
mluis 1:352f608c3337 823 copy_and_key( s1, in, o_key );
mluis 1:352f608c3337 824
mluis 1:352f608c3337 825 for( r = 1 ; r < 14 ; ++r )
mluis 1:352f608c3337 826 #if defined( VERSION_1 )
mluis 1:352f608c3337 827 {
mluis 1:352f608c3337 828 mix_sub_columns(s1);
mluis 1:352f608c3337 829 if( r & 1 )
mluis 1:352f608c3337 830 add_round_key( s1, o_key + 16 );
mluis 1:352f608c3337 831 else
mluis 1:352f608c3337 832 {
mluis 1:352f608c3337 833 update_encrypt_key_256( o_key, &rc );
mluis 1:352f608c3337 834 add_round_key( s1, o_key );
mluis 1:352f608c3337 835 }
mluis 1:352f608c3337 836 }
mluis 1:352f608c3337 837 #else
mluis 1:352f608c3337 838 { uint8_t s2[N_BLOCK];
mluis 1:352f608c3337 839 mix_sub_columns( s2, s1 );
mluis 1:352f608c3337 840 if( r & 1 )
mluis 1:352f608c3337 841 copy_and_key( s1, s2, o_key + 16 );
mluis 1:352f608c3337 842 else
mluis 1:352f608c3337 843 {
mluis 1:352f608c3337 844 update_encrypt_key_256( o_key, &rc );
mluis 1:352f608c3337 845 copy_and_key( s1, s2, o_key );
mluis 1:352f608c3337 846 }
mluis 1:352f608c3337 847 }
mluis 1:352f608c3337 848 #endif
mluis 1:352f608c3337 849
mluis 1:352f608c3337 850 shift_sub_rows( s1 );
mluis 1:352f608c3337 851 update_encrypt_key_256( o_key, &rc );
mluis 1:352f608c3337 852 copy_and_key( out, s1, o_key );
mluis 1:352f608c3337 853 }
mluis 1:352f608c3337 854
mluis 1:352f608c3337 855 #endif
mluis 1:352f608c3337 856
mluis 1:352f608c3337 857 #if defined( AES_DEC_256_OTFK )
mluis 1:352f608c3337 858
mluis 1:352f608c3337 859 /* The 'on the fly' encryption key update for for 256 bit keys */
mluis 1:352f608c3337 860
mluis 1:352f608c3337 861 static void update_decrypt_key_256( uint8_t k[2 * N_BLOCK], uint8_t *rc )
mluis 1:352f608c3337 862 { uint8_t cc;
mluis 1:352f608c3337 863
mluis 1:352f608c3337 864 for(cc = 28; cc > 16; cc -= 4)
mluis 1:352f608c3337 865 {
mluis 1:352f608c3337 866 k[cc + 0] ^= k[cc - 4];
mluis 1:352f608c3337 867 k[cc + 1] ^= k[cc - 3];
mluis 1:352f608c3337 868 k[cc + 2] ^= k[cc - 2];
mluis 1:352f608c3337 869 k[cc + 3] ^= k[cc - 1];
mluis 1:352f608c3337 870 }
mluis 1:352f608c3337 871
mluis 1:352f608c3337 872 k[16] ^= s_box(k[12]);
mluis 1:352f608c3337 873 k[17] ^= s_box(k[13]);
mluis 1:352f608c3337 874 k[18] ^= s_box(k[14]);
mluis 1:352f608c3337 875 k[19] ^= s_box(k[15]);
mluis 1:352f608c3337 876
mluis 1:352f608c3337 877 for(cc = 12; cc > 0; cc -= 4)
mluis 1:352f608c3337 878 {
mluis 1:352f608c3337 879 k[cc + 0] ^= k[cc - 4];
mluis 1:352f608c3337 880 k[cc + 1] ^= k[cc - 3];
mluis 1:352f608c3337 881 k[cc + 2] ^= k[cc - 2];
mluis 1:352f608c3337 882 k[cc + 3] ^= k[cc - 1];
mluis 1:352f608c3337 883 }
mluis 1:352f608c3337 884
mluis 1:352f608c3337 885 *rc = d2(*rc);
mluis 1:352f608c3337 886 k[0] ^= s_box(k[29]) ^ *rc;
mluis 1:352f608c3337 887 k[1] ^= s_box(k[30]);
mluis 1:352f608c3337 888 k[2] ^= s_box(k[31]);
mluis 1:352f608c3337 889 k[3] ^= s_box(k[28]);
mluis 1:352f608c3337 890 }
mluis 1:352f608c3337 891
mluis 1:352f608c3337 892 /* Decrypt a single block of 16 bytes with 'on the fly'
mluis 1:352f608c3337 893 256 bit keying
mluis 1:352f608c3337 894 */
mluis 1:352f608c3337 895 void aes_decrypt_256( const uint8_t in[N_BLOCK], uint8_t out[N_BLOCK],
mluis 1:352f608c3337 896 const uint8_t key[2 * N_BLOCK], uint8_t o_key[2 * N_BLOCK] )
mluis 1:352f608c3337 897 {
mluis 1:352f608c3337 898 uint8_t s1[N_BLOCK], r, rc = 0x80;
mluis 1:352f608c3337 899
mluis 1:352f608c3337 900 if(o_key != key)
mluis 1:352f608c3337 901 {
mluis 1:352f608c3337 902 block_copy( o_key, key );
mluis 1:352f608c3337 903 block_copy( o_key + 16, key + 16 );
mluis 1:352f608c3337 904 }
mluis 1:352f608c3337 905
mluis 1:352f608c3337 906 copy_and_key( s1, in, o_key );
mluis 1:352f608c3337 907 inv_shift_sub_rows( s1 );
mluis 1:352f608c3337 908
mluis 1:352f608c3337 909 for( r = 14 ; --r ; )
mluis 1:352f608c3337 910 #if defined( VERSION_1 )
mluis 1:352f608c3337 911 {
mluis 1:352f608c3337 912 if( ( r & 1 ) )
mluis 1:352f608c3337 913 {
mluis 1:352f608c3337 914 update_decrypt_key_256( o_key, &rc );
mluis 1:352f608c3337 915 add_round_key( s1, o_key + 16 );
mluis 1:352f608c3337 916 }
mluis 1:352f608c3337 917 else
mluis 1:352f608c3337 918 add_round_key( s1, o_key );
mluis 1:352f608c3337 919 inv_mix_sub_columns( s1 );
mluis 1:352f608c3337 920 }
mluis 1:352f608c3337 921 #else
mluis 1:352f608c3337 922 { uint8_t s2[N_BLOCK];
mluis 1:352f608c3337 923 if( ( r & 1 ) )
mluis 1:352f608c3337 924 {
mluis 1:352f608c3337 925 update_decrypt_key_256( o_key, &rc );
mluis 1:352f608c3337 926 copy_and_key( s2, s1, o_key + 16 );
mluis 1:352f608c3337 927 }
mluis 1:352f608c3337 928 else
mluis 1:352f608c3337 929 copy_and_key( s2, s1, o_key );
mluis 1:352f608c3337 930 inv_mix_sub_columns( s1, s2 );
mluis 1:352f608c3337 931 }
mluis 1:352f608c3337 932 #endif
mluis 1:352f608c3337 933 copy_and_key( out, s1, o_key );
mluis 1:352f608c3337 934 }
mluis 1:352f608c3337 935
mluis 1:352f608c3337 936 #endif