Embedded systems coursework 2.
Fork of Crypto_light by
cipher/AES.cpp@8:a090264e9b2d, 2013-09-14 (annotated)
- Committer:
- feb11
- Date:
- Sat Sep 14 20:54:59 2013 +0000
- Revision:
- 8:a090264e9b2d
- Parent:
- 7:2dbbdfb08123
refactored public API for ciphers & added TDES
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
feb11 | 0:7a1237bd2d13 | 1 | #include "AES.h" |
feb11 | 0:7a1237bd2d13 | 2 | #include <string.h> |
feb11 | 0:7a1237bd2d13 | 3 | #include <stdio.h> |
feb11 | 0:7a1237bd2d13 | 4 | #include <stdlib.h> |
feb11 | 0:7a1237bd2d13 | 5 | |
feb11 | 0:7a1237bd2d13 | 6 | static const uint8_t sbox[] = |
feb11 | 0:7a1237bd2d13 | 7 | { |
feb11 | 0:7a1237bd2d13 | 8 | 0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76, |
feb11 | 0:7a1237bd2d13 | 9 | 0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0, |
feb11 | 0:7a1237bd2d13 | 10 | 0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15, |
feb11 | 0:7a1237bd2d13 | 11 | 0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75, |
feb11 | 0:7a1237bd2d13 | 12 | 0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84, |
feb11 | 0:7a1237bd2d13 | 13 | 0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF, |
feb11 | 0:7a1237bd2d13 | 14 | 0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8, |
feb11 | 0:7a1237bd2d13 | 15 | 0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2, |
feb11 | 0:7a1237bd2d13 | 16 | 0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73, |
feb11 | 0:7a1237bd2d13 | 17 | 0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB, |
feb11 | 0:7a1237bd2d13 | 18 | 0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79, |
feb11 | 0:7a1237bd2d13 | 19 | 0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08, |
feb11 | 0:7a1237bd2d13 | 20 | 0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A, |
feb11 | 0:7a1237bd2d13 | 21 | 0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E, |
feb11 | 0:7a1237bd2d13 | 22 | 0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF, |
feb11 | 0:7a1237bd2d13 | 23 | 0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16 |
feb11 | 0:7a1237bd2d13 | 24 | }; |
feb11 | 0:7a1237bd2d13 | 25 | |
feb11 | 0:7a1237bd2d13 | 26 | static const uint8_t inv_s[] = |
feb11 | 0:7a1237bd2d13 | 27 | { |
feb11 | 0:7a1237bd2d13 | 28 | 0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB, |
feb11 | 0:7a1237bd2d13 | 29 | 0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB, |
feb11 | 0:7a1237bd2d13 | 30 | 0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E, |
feb11 | 0:7a1237bd2d13 | 31 | 0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25, |
feb11 | 0:7a1237bd2d13 | 32 | 0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92, |
feb11 | 0:7a1237bd2d13 | 33 | 0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84, |
feb11 | 0:7a1237bd2d13 | 34 | 0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06, |
feb11 | 0:7a1237bd2d13 | 35 | 0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B, |
feb11 | 0:7a1237bd2d13 | 36 | 0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73, |
feb11 | 0:7a1237bd2d13 | 37 | 0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E, |
feb11 | 0:7a1237bd2d13 | 38 | 0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B, |
feb11 | 0:7a1237bd2d13 | 39 | 0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4, |
feb11 | 0:7a1237bd2d13 | 40 | 0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F, |
feb11 | 0:7a1237bd2d13 | 41 | 0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF, |
feb11 | 0:7a1237bd2d13 | 42 | 0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61, |
feb11 | 0:7a1237bd2d13 | 43 | 0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D |
feb11 | 0:7a1237bd2d13 | 44 | }; |
feb11 | 0:7a1237bd2d13 | 45 | |
feb11 | 0:7a1237bd2d13 | 46 | |
feb11 | 0:7a1237bd2d13 | 47 | static const uint32_t rcon[10]= |
feb11 | 0:7a1237bd2d13 | 48 | { |
feb11 | 0:7a1237bd2d13 | 49 | 0x01000000, 0x02000000, 0x04000000, 0x08000000, |
feb11 | 0:7a1237bd2d13 | 50 | 0x10000000, 0x20000000, 0x40000000, 0x80000000, |
feb11 | 0:7a1237bd2d13 | 51 | 0x1B000000, 0x36000000 |
feb11 | 0:7a1237bd2d13 | 52 | }; |
feb11 | 0:7a1237bd2d13 | 53 | |
feb11 | 0:7a1237bd2d13 | 54 | AES::AES(const AES_TYPE t, uint8_t *key): |
feb11 | 8:a090264e9b2d | 55 | BlockCipher(16,ECB_MODE), |
feb11 | 8:a090264e9b2d | 56 | state() |
feb11 | 8:a090264e9b2d | 57 | { |
feb11 | 8:a090264e9b2d | 58 | switch(t) |
feb11 | 8:a090264e9b2d | 59 | { |
feb11 | 8:a090264e9b2d | 60 | case AES_128: |
feb11 | 8:a090264e9b2d | 61 | nr = 10; |
feb11 | 8:a090264e9b2d | 62 | nk = 4; |
feb11 | 8:a090264e9b2d | 63 | break; |
feb11 | 8:a090264e9b2d | 64 | |
feb11 | 8:a090264e9b2d | 65 | case AES_192: |
feb11 | 8:a090264e9b2d | 66 | nr = 12; |
feb11 | 8:a090264e9b2d | 67 | nk = 6; |
feb11 | 8:a090264e9b2d | 68 | break; |
feb11 | 8:a090264e9b2d | 69 | |
feb11 | 8:a090264e9b2d | 70 | case AES_256: |
feb11 | 8:a090264e9b2d | 71 | nr = 14; |
feb11 | 8:a090264e9b2d | 72 | nk = 8; |
feb11 | 8:a090264e9b2d | 73 | break; |
feb11 | 8:a090264e9b2d | 74 | } |
feb11 | 8:a090264e9b2d | 75 | |
feb11 | 8:a090264e9b2d | 76 | keyExpansion(key); |
feb11 | 8:a090264e9b2d | 77 | } |
feb11 | 8:a090264e9b2d | 78 | |
feb11 | 8:a090264e9b2d | 79 | AES::AES(const AES_TYPE t, uint8_t *key, uint8_t *iv): |
feb11 | 8:a090264e9b2d | 80 | BlockCipher(16,CBC_MODE, iv), |
feb11 | 0:7a1237bd2d13 | 81 | state() |
feb11 | 0:7a1237bd2d13 | 82 | { |
feb11 | 0:7a1237bd2d13 | 83 | switch(t) |
feb11 | 0:7a1237bd2d13 | 84 | { |
feb11 | 0:7a1237bd2d13 | 85 | case AES_128: |
feb11 | 0:7a1237bd2d13 | 86 | nr = 10; |
feb11 | 0:7a1237bd2d13 | 87 | nk = 4; |
feb11 | 0:7a1237bd2d13 | 88 | break; |
feb11 | 0:7a1237bd2d13 | 89 | |
feb11 | 0:7a1237bd2d13 | 90 | case AES_192: |
feb11 | 0:7a1237bd2d13 | 91 | nr = 12; |
feb11 | 0:7a1237bd2d13 | 92 | nk = 6; |
feb11 | 0:7a1237bd2d13 | 93 | break; |
feb11 | 0:7a1237bd2d13 | 94 | |
feb11 | 0:7a1237bd2d13 | 95 | case AES_256: |
feb11 | 0:7a1237bd2d13 | 96 | nr = 14; |
feb11 | 0:7a1237bd2d13 | 97 | nk = 8; |
feb11 | 0:7a1237bd2d13 | 98 | break; |
feb11 | 0:7a1237bd2d13 | 99 | } |
feb11 | 0:7a1237bd2d13 | 100 | |
feb11 | 0:7a1237bd2d13 | 101 | keyExpansion(key); |
feb11 | 0:7a1237bd2d13 | 102 | } |
feb11 | 0:7a1237bd2d13 | 103 | |
feb11 | 0:7a1237bd2d13 | 104 | void AES::keyExpansion(uint8_t *key) |
feb11 | 0:7a1237bd2d13 | 105 | { |
feb11 | 0:7a1237bd2d13 | 106 | uint32_t temp; |
feb11 | 0:7a1237bd2d13 | 107 | int i = 0; |
feb11 | 0:7a1237bd2d13 | 108 | |
feb11 | 0:7a1237bd2d13 | 109 | while(i < nk) |
feb11 | 0:7a1237bd2d13 | 110 | { |
feb11 | 0:7a1237bd2d13 | 111 | w[i] = (key[4*i] << 24) + (key[4*i+1] << 16) + (key[4*i+2] << 8) + key[4*i+3]; |
feb11 | 0:7a1237bd2d13 | 112 | i++; |
feb11 | 0:7a1237bd2d13 | 113 | } |
feb11 | 0:7a1237bd2d13 | 114 | i = nk; |
feb11 | 0:7a1237bd2d13 | 115 | while(i < 4*(nr+1)) |
feb11 | 0:7a1237bd2d13 | 116 | { |
feb11 | 0:7a1237bd2d13 | 117 | temp = w[i-1]; |
feb11 | 0:7a1237bd2d13 | 118 | if(i % nk == 0) |
feb11 | 0:7a1237bd2d13 | 119 | { |
feb11 | 0:7a1237bd2d13 | 120 | temp = rotWord(temp); |
feb11 | 0:7a1237bd2d13 | 121 | temp = subWord(temp); |
feb11 | 0:7a1237bd2d13 | 122 | temp ^= rcon[i/nk-1]; |
feb11 | 0:7a1237bd2d13 | 123 | } |
feb11 | 0:7a1237bd2d13 | 124 | else if(nk > 6 && i % nk == 4) |
feb11 | 0:7a1237bd2d13 | 125 | temp = subWord(temp); |
feb11 | 0:7a1237bd2d13 | 126 | w[i] = w[i-nk] ^ temp; |
feb11 | 0:7a1237bd2d13 | 127 | i++; |
feb11 | 0:7a1237bd2d13 | 128 | } |
feb11 | 0:7a1237bd2d13 | 129 | } |
feb11 | 0:7a1237bd2d13 | 130 | |
feb11 | 0:7a1237bd2d13 | 131 | uint32_t AES::rotWord(uint32_t w) |
feb11 | 0:7a1237bd2d13 | 132 | { |
feb11 | 0:7a1237bd2d13 | 133 | return (w << 8) + (w >> 24); |
feb11 | 0:7a1237bd2d13 | 134 | } |
feb11 | 0:7a1237bd2d13 | 135 | |
feb11 | 0:7a1237bd2d13 | 136 | uint32_t AES::invRotWord(uint32_t w) |
feb11 | 0:7a1237bd2d13 | 137 | { |
feb11 | 0:7a1237bd2d13 | 138 | return (w >> 8) + (w << 24); |
feb11 | 0:7a1237bd2d13 | 139 | } |
feb11 | 0:7a1237bd2d13 | 140 | |
feb11 | 0:7a1237bd2d13 | 141 | uint32_t AES::subWord(uint32_t w) |
feb11 | 0:7a1237bd2d13 | 142 | { |
feb11 | 0:7a1237bd2d13 | 143 | uint32_t out = 0; |
feb11 | 0:7a1237bd2d13 | 144 | for(int i = 0; i < 4; ++i) |
feb11 | 0:7a1237bd2d13 | 145 | { |
feb11 | 0:7a1237bd2d13 | 146 | uint8_t temp = (w & 0xFF); |
feb11 | 0:7a1237bd2d13 | 147 | out |= (sbox[temp] << (8*i)); |
feb11 | 0:7a1237bd2d13 | 148 | w = (w >> 8); |
feb11 | 0:7a1237bd2d13 | 149 | } |
feb11 | 0:7a1237bd2d13 | 150 | return out; |
feb11 | 0:7a1237bd2d13 | 151 | } |
feb11 | 0:7a1237bd2d13 | 152 | |
feb11 | 0:7a1237bd2d13 | 153 | void AES::subBytes() |
feb11 | 0:7a1237bd2d13 | 154 | { |
feb11 | 0:7a1237bd2d13 | 155 | for(int i = 0; i < 16; ++i) |
feb11 | 0:7a1237bd2d13 | 156 | state[i] = sbox[state[i]]; |
feb11 | 0:7a1237bd2d13 | 157 | } |
feb11 | 0:7a1237bd2d13 | 158 | |
feb11 | 0:7a1237bd2d13 | 159 | void AES::invSubBytes() |
feb11 | 0:7a1237bd2d13 | 160 | { |
feb11 | 0:7a1237bd2d13 | 161 | for(int i = 0; i < 16; ++i) |
feb11 | 0:7a1237bd2d13 | 162 | state[i] = inv_s[state[i]]; |
feb11 | 0:7a1237bd2d13 | 163 | } |
feb11 | 0:7a1237bd2d13 | 164 | |
feb11 | 0:7a1237bd2d13 | 165 | void AES::shiftRows() |
feb11 | 0:7a1237bd2d13 | 166 | { |
feb11 | 0:7a1237bd2d13 | 167 | for(int r = 0; r < 4; ++r) |
feb11 | 0:7a1237bd2d13 | 168 | { |
feb11 | 0:7a1237bd2d13 | 169 | uint32_t temp = (state[r] << 24) + (state[r+4] << 16) + (state[r+8] << 8) + state[r+12]; |
feb11 | 0:7a1237bd2d13 | 170 | int i = r; |
feb11 | 0:7a1237bd2d13 | 171 | while(i > 0) |
feb11 | 0:7a1237bd2d13 | 172 | { |
feb11 | 0:7a1237bd2d13 | 173 | temp = rotWord(temp); |
feb11 | 0:7a1237bd2d13 | 174 | --i; |
feb11 | 0:7a1237bd2d13 | 175 | } |
feb11 | 0:7a1237bd2d13 | 176 | state[r] = temp >> 24; |
feb11 | 2:473bac39ae7c | 177 | state[r+4] = temp >> 16; |
feb11 | 2:473bac39ae7c | 178 | state[r+8] = temp >> 8; |
feb11 | 2:473bac39ae7c | 179 | state[r+12] = temp; |
feb11 | 0:7a1237bd2d13 | 180 | } |
feb11 | 0:7a1237bd2d13 | 181 | } |
feb11 | 0:7a1237bd2d13 | 182 | |
feb11 | 0:7a1237bd2d13 | 183 | void AES::invShiftRows() |
feb11 | 0:7a1237bd2d13 | 184 | { |
feb11 | 0:7a1237bd2d13 | 185 | for(int r = 0; r < 4; ++r) |
feb11 | 0:7a1237bd2d13 | 186 | { |
feb11 | 0:7a1237bd2d13 | 187 | uint32_t temp = (state[r] << 24) + (state[r+4] << 16) + (state[r+8] << 8) + state[r+12]; |
feb11 | 0:7a1237bd2d13 | 188 | int i = r; |
feb11 | 0:7a1237bd2d13 | 189 | while(i > 0) |
feb11 | 0:7a1237bd2d13 | 190 | { |
feb11 | 0:7a1237bd2d13 | 191 | temp = invRotWord(temp); |
feb11 | 0:7a1237bd2d13 | 192 | --i; |
feb11 | 0:7a1237bd2d13 | 193 | } |
feb11 | 0:7a1237bd2d13 | 194 | state[r] = temp >> 24; |
feb11 | 2:473bac39ae7c | 195 | state[r+4] = temp >> 16; |
feb11 | 2:473bac39ae7c | 196 | state[r+8] = temp >> 8; |
feb11 | 2:473bac39ae7c | 197 | state[r+12] = temp; |
feb11 | 0:7a1237bd2d13 | 198 | } |
feb11 | 0:7a1237bd2d13 | 199 | } |
feb11 | 0:7a1237bd2d13 | 200 | |
feb11 | 0:7a1237bd2d13 | 201 | /* Multiply two numbers in the GF(2^8) finite field defined |
feb11 | 0:7a1237bd2d13 | 202 | * by the polynomial x^8 + x^4 + x^3 + x + 1 */ |
feb11 | 0:7a1237bd2d13 | 203 | uint8_t gmul(uint8_t a, uint8_t b) |
feb11 | 0:7a1237bd2d13 | 204 | { |
feb11 | 0:7a1237bd2d13 | 205 | uint8_t p = 0; |
feb11 | 0:7a1237bd2d13 | 206 | uint8_t counter; |
feb11 | 0:7a1237bd2d13 | 207 | uint8_t carry; |
feb11 | 0:7a1237bd2d13 | 208 | for (counter = 0; counter < 8; counter++) { |
feb11 | 0:7a1237bd2d13 | 209 | if (b & 1) |
feb11 | 0:7a1237bd2d13 | 210 | p ^= a; |
feb11 | 0:7a1237bd2d13 | 211 | carry = (a & 0x80); |
feb11 | 0:7a1237bd2d13 | 212 | a <<= 1; |
feb11 | 0:7a1237bd2d13 | 213 | if (carry) |
feb11 | 0:7a1237bd2d13 | 214 | a ^= 0x001B; /* what x^8 is modulo x^8 + x^4 + x^3 + x^2 + 1 */ |
feb11 | 0:7a1237bd2d13 | 215 | b >>= 1; |
feb11 | 0:7a1237bd2d13 | 216 | } |
feb11 | 0:7a1237bd2d13 | 217 | return p; |
feb11 | 0:7a1237bd2d13 | 218 | } |
feb11 | 0:7a1237bd2d13 | 219 | |
feb11 | 0:7a1237bd2d13 | 220 | void AES::mul(uint8_t *r) |
feb11 | 0:7a1237bd2d13 | 221 | { |
feb11 | 0:7a1237bd2d13 | 222 | uint8_t tmp[4]; |
feb11 | 0:7a1237bd2d13 | 223 | memcpy(tmp, r, 4); |
feb11 | 0:7a1237bd2d13 | 224 | r[0] = gmul(tmp[0],2) ^ gmul(tmp[1],3) ^ tmp[2] ^ tmp[3]; |
feb11 | 0:7a1237bd2d13 | 225 | r[1] = tmp[0] ^ gmul(tmp[1],2) ^ gmul(tmp[2],3) ^ tmp[3]; |
feb11 | 0:7a1237bd2d13 | 226 | r[2] = tmp[0] ^ tmp[1] ^ gmul(tmp[2],2) ^ gmul(tmp[3],3); |
feb11 | 0:7a1237bd2d13 | 227 | r[3] = gmul(tmp[0],3) ^ tmp[1] ^ tmp[2] ^ gmul(tmp[3],2); |
feb11 | 0:7a1237bd2d13 | 228 | } |
feb11 | 0:7a1237bd2d13 | 229 | |
feb11 | 0:7a1237bd2d13 | 230 | void AES::invMul(uint8_t *r) |
feb11 | 0:7a1237bd2d13 | 231 | { |
feb11 | 0:7a1237bd2d13 | 232 | uint8_t tmp[4]; |
feb11 | 0:7a1237bd2d13 | 233 | memcpy(tmp, r, 4); |
feb11 | 0:7a1237bd2d13 | 234 | r[0] = gmul(tmp[0],0x0e) ^ gmul(tmp[1],0x0b) ^ gmul(tmp[2],0x0d) ^ gmul(tmp[3],9); |
feb11 | 0:7a1237bd2d13 | 235 | r[1] = gmul(tmp[0],9) ^ gmul(tmp[1],0x0e) ^ gmul(tmp[2],0x0b) ^ gmul(tmp[3],0x0d); |
feb11 | 0:7a1237bd2d13 | 236 | r[2] = gmul(tmp[0],0x0d) ^ gmul(tmp[1],9) ^ gmul(tmp[2],0x0e) ^ gmul(tmp[3],0x0b); |
feb11 | 0:7a1237bd2d13 | 237 | r[3] = gmul(tmp[0],0x0b) ^ gmul(tmp[1],0x0d) ^ gmul(tmp[2],9) ^ gmul(tmp[3],0x0e); |
feb11 | 0:7a1237bd2d13 | 238 | } |
feb11 | 0:7a1237bd2d13 | 239 | |
feb11 | 0:7a1237bd2d13 | 240 | void AES::mixColumns() |
feb11 | 0:7a1237bd2d13 | 241 | { |
feb11 | 0:7a1237bd2d13 | 242 | for(int c = 0; c < 4; ++c) |
feb11 | 0:7a1237bd2d13 | 243 | mul(&state[4*c]); |
feb11 | 0:7a1237bd2d13 | 244 | } |
feb11 | 0:7a1237bd2d13 | 245 | |
feb11 | 0:7a1237bd2d13 | 246 | void AES::invMixColumns() |
feb11 | 0:7a1237bd2d13 | 247 | { |
feb11 | 0:7a1237bd2d13 | 248 | for(int c = 0; c < 4; ++c) |
feb11 | 0:7a1237bd2d13 | 249 | invMul(&state[4*c]); |
feb11 | 0:7a1237bd2d13 | 250 | } |
feb11 | 0:7a1237bd2d13 | 251 | |
feb11 | 0:7a1237bd2d13 | 252 | void AES::addRoundKey(int round) |
feb11 | 0:7a1237bd2d13 | 253 | { |
feb11 | 0:7a1237bd2d13 | 254 | for(int c = 0; c < 4; ++c) |
feb11 | 0:7a1237bd2d13 | 255 | { |
feb11 | 0:7a1237bd2d13 | 256 | uint32_t temp = (state[4*c] << 24) + (state[4*c+1] << 16) + (state[4*c+2] << 8) + state[4*c+3]; |
feb11 | 0:7a1237bd2d13 | 257 | temp ^= w[round*4+c]; |
feb11 | 2:473bac39ae7c | 258 | state[4*c] = temp >> 24; |
feb11 | 2:473bac39ae7c | 259 | state[4*c+1] = temp >> 16; |
feb11 | 2:473bac39ae7c | 260 | state[4*c+2] = temp >> 8; |
feb11 | 2:473bac39ae7c | 261 | state[4*c+3] = temp; |
feb11 | 0:7a1237bd2d13 | 262 | } |
feb11 | 0:7a1237bd2d13 | 263 | } |
feb11 | 0:7a1237bd2d13 | 264 | |
feb11 | 0:7a1237bd2d13 | 265 | void AES::decryptBlock(uint8_t *out, uint8_t *in) |
feb11 | 0:7a1237bd2d13 | 266 | { |
feb11 | 0:7a1237bd2d13 | 267 | memcpy(state,in,16); |
feb11 | 0:7a1237bd2d13 | 268 | |
feb11 | 0:7a1237bd2d13 | 269 | addRoundKey(nr); |
feb11 | 0:7a1237bd2d13 | 270 | |
feb11 | 0:7a1237bd2d13 | 271 | for(int round = nr-1; round > 0; --round) |
feb11 | 0:7a1237bd2d13 | 272 | { |
feb11 | 0:7a1237bd2d13 | 273 | invShiftRows(); |
feb11 | 0:7a1237bd2d13 | 274 | invSubBytes(); |
feb11 | 0:7a1237bd2d13 | 275 | addRoundKey(round); |
feb11 | 0:7a1237bd2d13 | 276 | invMixColumns(); |
feb11 | 0:7a1237bd2d13 | 277 | } |
feb11 | 0:7a1237bd2d13 | 278 | invShiftRows(); |
feb11 | 0:7a1237bd2d13 | 279 | invSubBytes(); |
feb11 | 0:7a1237bd2d13 | 280 | addRoundKey(0); |
feb11 | 0:7a1237bd2d13 | 281 | |
feb11 | 0:7a1237bd2d13 | 282 | memcpy(out, state, 16); |
feb11 | 0:7a1237bd2d13 | 283 | } |
feb11 | 0:7a1237bd2d13 | 284 | |
feb11 | 0:7a1237bd2d13 | 285 | void AES::encryptBlock(uint8_t *out, uint8_t *in) |
feb11 | 0:7a1237bd2d13 | 286 | { |
feb11 | 0:7a1237bd2d13 | 287 | memcpy(state,in,16); |
feb11 | 0:7a1237bd2d13 | 288 | |
feb11 | 0:7a1237bd2d13 | 289 | addRoundKey(0); |
feb11 | 0:7a1237bd2d13 | 290 | |
feb11 | 0:7a1237bd2d13 | 291 | for(int round = 1; round < nr; ++round) |
feb11 | 0:7a1237bd2d13 | 292 | { |
feb11 | 0:7a1237bd2d13 | 293 | subBytes(); |
feb11 | 0:7a1237bd2d13 | 294 | shiftRows(); |
feb11 | 0:7a1237bd2d13 | 295 | mixColumns(); |
feb11 | 0:7a1237bd2d13 | 296 | addRoundKey(round); |
feb11 | 0:7a1237bd2d13 | 297 | } |
feb11 | 0:7a1237bd2d13 | 298 | subBytes(); |
feb11 | 0:7a1237bd2d13 | 299 | shiftRows(); |
feb11 | 0:7a1237bd2d13 | 300 | addRoundKey(nr); |
feb11 | 0:7a1237bd2d13 | 301 | |
feb11 | 0:7a1237bd2d13 | 302 | memcpy(out, state, 16); |
feb11 | 0:7a1237bd2d13 | 303 | } |