Edward Stott / Crypto_light

This library implements some hash and cryptographic algorithms.

Dependents:   ES_CW2_Starter_JIN EMBEDDED_CW2 EMBEDDED_CW2_Final Spinnybois ... more

Fork of Crypto by Francois Berder

AES.cpp@0:7a1237bd2d13, 2013-09-07 (annotated)

Committer:
feb11
Date:
Sat Sep 07 23:47:28 2013 +0000
Revision:
0:7a1237bd2d13
Child:
2:473bac39ae7c
initial import

Who changed what in which revision?

UserRevisionLine numberNew 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 0:7a1237bd2d13 55 state()
feb11 0:7a1237bd2d13 56 {
feb11 0:7a1237bd2d13 57 switch(t)
feb11 0:7a1237bd2d13 58 {
feb11 0:7a1237bd2d13 59 case AES_128:
feb11 0:7a1237bd2d13 60 nr = 10;
feb11 0:7a1237bd2d13 61 nk = 4;
feb11 0:7a1237bd2d13 62 break;
feb11 0:7a1237bd2d13 63
feb11 0:7a1237bd2d13 64 case AES_192:
feb11 0:7a1237bd2d13 65 nr = 12;
feb11 0:7a1237bd2d13 66 nk = 6;
feb11 0:7a1237bd2d13 67 break;
feb11 0:7a1237bd2d13 68
feb11 0:7a1237bd2d13 69 case AES_256:
feb11 0:7a1237bd2d13 70 nr = 14;
feb11 0:7a1237bd2d13 71 nk = 8;
feb11 0:7a1237bd2d13 72 break;
feb11 0:7a1237bd2d13 73 }
feb11 0:7a1237bd2d13 74
feb11 0:7a1237bd2d13 75 keyExpansion(key);
feb11 0:7a1237bd2d13 76 }
feb11 0:7a1237bd2d13 77
feb11 0:7a1237bd2d13 78 void AES::keyExpansion(uint8_t *key)
feb11 0:7a1237bd2d13 79 {
feb11 0:7a1237bd2d13 80 uint32_t temp;
feb11 0:7a1237bd2d13 81 int i = 0;
feb11 0:7a1237bd2d13 82
feb11 0:7a1237bd2d13 83 while(i < nk)
feb11 0:7a1237bd2d13 84 {
feb11 0:7a1237bd2d13 85 w[i] = (key[4*i] << 24) + (key[4*i+1] << 16) + (key[4*i+2] << 8) + key[4*i+3];
feb11 0:7a1237bd2d13 86 i++;
feb11 0:7a1237bd2d13 87 }
feb11 0:7a1237bd2d13 88 i = nk;
feb11 0:7a1237bd2d13 89 while(i < 4*(nr+1))
feb11 0:7a1237bd2d13 90 {
feb11 0:7a1237bd2d13 91 temp = w[i-1];
feb11 0:7a1237bd2d13 92 if(i % nk == 0)
feb11 0:7a1237bd2d13 93 {
feb11 0:7a1237bd2d13 94 temp = rotWord(temp);
feb11 0:7a1237bd2d13 95 temp = subWord(temp);
feb11 0:7a1237bd2d13 96 temp ^= rcon[i/nk-1];
feb11 0:7a1237bd2d13 97 }
feb11 0:7a1237bd2d13 98 else if(nk > 6 && i % nk == 4)
feb11 0:7a1237bd2d13 99 temp = subWord(temp);
feb11 0:7a1237bd2d13 100 w[i] = w[i-nk] ^ temp;
feb11 0:7a1237bd2d13 101 i++;
feb11 0:7a1237bd2d13 102 }
feb11 0:7a1237bd2d13 103 }
feb11 0:7a1237bd2d13 104
feb11 0:7a1237bd2d13 105 uint32_t AES::rotWord(uint32_t w)
feb11 0:7a1237bd2d13 106 {
feb11 0:7a1237bd2d13 107 return (w << 8) + (w >> 24);
feb11 0:7a1237bd2d13 108 }
feb11 0:7a1237bd2d13 109
feb11 0:7a1237bd2d13 110 uint32_t AES::invRotWord(uint32_t w)
feb11 0:7a1237bd2d13 111 {
feb11 0:7a1237bd2d13 112 return (w >> 8) + (w << 24);
feb11 0:7a1237bd2d13 113 }
feb11 0:7a1237bd2d13 114
feb11 0:7a1237bd2d13 115 uint32_t AES::subWord(uint32_t w)
feb11 0:7a1237bd2d13 116 {
feb11 0:7a1237bd2d13 117 uint32_t out = 0;
feb11 0:7a1237bd2d13 118 for(int i = 0; i < 4; ++i)
feb11 0:7a1237bd2d13 119 {
feb11 0:7a1237bd2d13 120 uint8_t temp = (w & 0xFF);
feb11 0:7a1237bd2d13 121 out |= (sbox[temp] << (8*i));
feb11 0:7a1237bd2d13 122 w = (w >> 8);
feb11 0:7a1237bd2d13 123 }
feb11 0:7a1237bd2d13 124 return out;
feb11 0:7a1237bd2d13 125 }
feb11 0:7a1237bd2d13 126
feb11 0:7a1237bd2d13 127 void AES::subBytes()
feb11 0:7a1237bd2d13 128 {
feb11 0:7a1237bd2d13 129 for(int i = 0; i < 16; ++i)
feb11 0:7a1237bd2d13 130 state[i] = sbox[state[i]];
feb11 0:7a1237bd2d13 131 }
feb11 0:7a1237bd2d13 132
feb11 0:7a1237bd2d13 133 void AES::invSubBytes()
feb11 0:7a1237bd2d13 134 {
feb11 0:7a1237bd2d13 135 for(int i = 0; i < 16; ++i)
feb11 0:7a1237bd2d13 136 state[i] = inv_s[state[i]];
feb11 0:7a1237bd2d13 137 }
feb11 0:7a1237bd2d13 138
feb11 0:7a1237bd2d13 139 void AES::shiftRows()
feb11 0:7a1237bd2d13 140 {
feb11 0:7a1237bd2d13 141 for(int r = 0; r < 4; ++r)
feb11 0:7a1237bd2d13 142 {
feb11 0:7a1237bd2d13 143 uint32_t temp = (state[r] << 24) + (state[r+4] << 16) + (state[r+8] << 8) + state[r+12];
feb11 0:7a1237bd2d13 144 int i = r;
feb11 0:7a1237bd2d13 145 while(i > 0)
feb11 0:7a1237bd2d13 146 {
feb11 0:7a1237bd2d13 147 temp = rotWord(temp);
feb11 0:7a1237bd2d13 148 --i;
feb11 0:7a1237bd2d13 149 }
feb11 0:7a1237bd2d13 150 state[r] = temp >> 24;
feb11 0:7a1237bd2d13 151 state[r+4] = (temp & 0x00FF0000) >> 16;
feb11 0:7a1237bd2d13 152 state[r+8] = (temp & 0x0000FF00) >> 8;
feb11 0:7a1237bd2d13 153 state[r+12] = temp & 0xFF;
feb11 0:7a1237bd2d13 154 }
feb11 0:7a1237bd2d13 155 }
feb11 0:7a1237bd2d13 156
feb11 0:7a1237bd2d13 157 void AES::invShiftRows()
feb11 0:7a1237bd2d13 158 {
feb11 0:7a1237bd2d13 159 for(int r = 0; r < 4; ++r)
feb11 0:7a1237bd2d13 160 {
feb11 0:7a1237bd2d13 161 uint32_t temp = (state[r] << 24) + (state[r+4] << 16) + (state[r+8] << 8) + state[r+12];
feb11 0:7a1237bd2d13 162 int i = r;
feb11 0:7a1237bd2d13 163 while(i > 0)
feb11 0:7a1237bd2d13 164 {
feb11 0:7a1237bd2d13 165 temp = invRotWord(temp);
feb11 0:7a1237bd2d13 166 --i;
feb11 0:7a1237bd2d13 167 }
feb11 0:7a1237bd2d13 168 state[r] = temp >> 24;
feb11 0:7a1237bd2d13 169 state[r+4] = (temp & 0x00FF0000) >> 16;
feb11 0:7a1237bd2d13 170 state[r+8] = (temp & 0x0000FF00) >> 8;
feb11 0:7a1237bd2d13 171 state[r+12] = temp & 0xFF;
feb11 0:7a1237bd2d13 172 }
feb11 0:7a1237bd2d13 173 }
feb11 0:7a1237bd2d13 174
feb11 0:7a1237bd2d13 175 /* Multiply two numbers in the GF(2^8) finite field defined
feb11 0:7a1237bd2d13 176 * by the polynomial x^8 + x^4 + x^3 + x + 1 */
feb11 0:7a1237bd2d13 177 uint8_t gmul(uint8_t a, uint8_t b)
feb11 0:7a1237bd2d13 178 {
feb11 0:7a1237bd2d13 179 uint8_t p = 0;
feb11 0:7a1237bd2d13 180 uint8_t counter;
feb11 0:7a1237bd2d13 181 uint8_t carry;
feb11 0:7a1237bd2d13 182 for (counter = 0; counter < 8; counter++) {
feb11 0:7a1237bd2d13 183 if (b & 1)
feb11 0:7a1237bd2d13 184 p ^= a;
feb11 0:7a1237bd2d13 185 carry = (a & 0x80);
feb11 0:7a1237bd2d13 186 a <<= 1;
feb11 0:7a1237bd2d13 187 if (carry)
feb11 0:7a1237bd2d13 188 a ^= 0x001B; /* what x^8 is modulo x^8 + x^4 + x^3 + x^2 + 1 */
feb11 0:7a1237bd2d13 189 b >>= 1;
feb11 0:7a1237bd2d13 190 }
feb11 0:7a1237bd2d13 191 return p;
feb11 0:7a1237bd2d13 192 }
feb11 0:7a1237bd2d13 193
feb11 0:7a1237bd2d13 194 void AES::mul(uint8_t *r)
feb11 0:7a1237bd2d13 195 {
feb11 0:7a1237bd2d13 196 uint8_t tmp[4];
feb11 0:7a1237bd2d13 197 memcpy(tmp, r, 4);
feb11 0:7a1237bd2d13 198 r[0] = gmul(tmp[0],2) ^ gmul(tmp[1],3) ^ tmp[2] ^ tmp[3];
feb11 0:7a1237bd2d13 199 r[1] = tmp[0] ^ gmul(tmp[1],2) ^ gmul(tmp[2],3) ^ tmp[3];
feb11 0:7a1237bd2d13 200 r[2] = tmp[0] ^ tmp[1] ^ gmul(tmp[2],2) ^ gmul(tmp[3],3);
feb11 0:7a1237bd2d13 201 r[3] = gmul(tmp[0],3) ^ tmp[1] ^ tmp[2] ^ gmul(tmp[3],2);
feb11 0:7a1237bd2d13 202 }
feb11 0:7a1237bd2d13 203
feb11 0:7a1237bd2d13 204 void AES::invMul(uint8_t *r)
feb11 0:7a1237bd2d13 205 {
feb11 0:7a1237bd2d13 206 uint8_t tmp[4];
feb11 0:7a1237bd2d13 207 memcpy(tmp, r, 4);
feb11 0:7a1237bd2d13 208 r[0] = gmul(tmp[0],0x0e) ^ gmul(tmp[1],0x0b) ^ gmul(tmp[2],0x0d) ^ gmul(tmp[3],9);
feb11 0:7a1237bd2d13 209 r[1] = gmul(tmp[0],9) ^ gmul(tmp[1],0x0e) ^ gmul(tmp[2],0x0b) ^ gmul(tmp[3],0x0d);
feb11 0:7a1237bd2d13 210 r[2] = gmul(tmp[0],0x0d) ^ gmul(tmp[1],9) ^ gmul(tmp[2],0x0e) ^ gmul(tmp[3],0x0b);
feb11 0:7a1237bd2d13 211 r[3] = gmul(tmp[0],0x0b) ^ gmul(tmp[1],0x0d) ^ gmul(tmp[2],9) ^ gmul(tmp[3],0x0e);
feb11 0:7a1237bd2d13 212 }
feb11 0:7a1237bd2d13 213
feb11 0:7a1237bd2d13 214 void AES::mixColumns()
feb11 0:7a1237bd2d13 215 {
feb11 0:7a1237bd2d13 216 for(int c = 0; c < 4; ++c)
feb11 0:7a1237bd2d13 217 mul(&state[4*c]);
feb11 0:7a1237bd2d13 218 }
feb11 0:7a1237bd2d13 219
feb11 0:7a1237bd2d13 220 void AES::invMixColumns()
feb11 0:7a1237bd2d13 221 {
feb11 0:7a1237bd2d13 222 for(int c = 0; c < 4; ++c)
feb11 0:7a1237bd2d13 223 invMul(&state[4*c]);
feb11 0:7a1237bd2d13 224 }
feb11 0:7a1237bd2d13 225
feb11 0:7a1237bd2d13 226 void AES::addRoundKey(int round)
feb11 0:7a1237bd2d13 227 {
feb11 0:7a1237bd2d13 228 for(int c = 0; c < 4; ++c)
feb11 0:7a1237bd2d13 229 {
feb11 0:7a1237bd2d13 230 uint32_t temp = (state[4*c] << 24) + (state[4*c+1] << 16) + (state[4*c+2] << 8) + state[4*c+3];
feb11 0:7a1237bd2d13 231 temp ^= w[round*4+c];
feb11 0:7a1237bd2d13 232 state[4*c] = (temp >> 24);
feb11 0:7a1237bd2d13 233 state[4*c+1] = ((temp & 0x00FF0000) >> 16);
feb11 0:7a1237bd2d13 234 state[4*c+2] = ((temp & 0x0000FF00) >> 8);
feb11 0:7a1237bd2d13 235 state[4*c+3] = temp & 0xFF;
feb11 0:7a1237bd2d13 236 }
feb11 0:7a1237bd2d13 237 }
feb11 0:7a1237bd2d13 238
feb11 0:7a1237bd2d13 239 void AES::decryptBlock(uint8_t *out, uint8_t *in)
feb11 0:7a1237bd2d13 240 {
feb11 0:7a1237bd2d13 241 memcpy(state,in,16);
feb11 0:7a1237bd2d13 242
feb11 0:7a1237bd2d13 243 addRoundKey(nr);
feb11 0:7a1237bd2d13 244
feb11 0:7a1237bd2d13 245 for(int round = nr-1; round > 0; --round)
feb11 0:7a1237bd2d13 246 {
feb11 0:7a1237bd2d13 247 invShiftRows();
feb11 0:7a1237bd2d13 248 invSubBytes();
feb11 0:7a1237bd2d13 249 addRoundKey(round);
feb11 0:7a1237bd2d13 250 invMixColumns();
feb11 0:7a1237bd2d13 251 }
feb11 0:7a1237bd2d13 252 invShiftRows();
feb11 0:7a1237bd2d13 253 invSubBytes();
feb11 0:7a1237bd2d13 254 addRoundKey(0);
feb11 0:7a1237bd2d13 255
feb11 0:7a1237bd2d13 256 memcpy(out, state, 16);
feb11 0:7a1237bd2d13 257 }
feb11 0:7a1237bd2d13 258
feb11 0:7a1237bd2d13 259 void AES::encryptBlock(uint8_t *out, uint8_t *in)
feb11 0:7a1237bd2d13 260 {
feb11 0:7a1237bd2d13 261 memcpy(state,in,16);
feb11 0:7a1237bd2d13 262
feb11 0:7a1237bd2d13 263 addRoundKey(0);
feb11 0:7a1237bd2d13 264
feb11 0:7a1237bd2d13 265 for(int round = 1; round < nr; ++round)
feb11 0:7a1237bd2d13 266 {
feb11 0:7a1237bd2d13 267 subBytes();
feb11 0:7a1237bd2d13 268 shiftRows();
feb11 0:7a1237bd2d13 269 mixColumns();
feb11 0:7a1237bd2d13 270 addRoundKey(round);
feb11 0:7a1237bd2d13 271 }
feb11 0:7a1237bd2d13 272 subBytes();
feb11 0:7a1237bd2d13 273 shiftRows();
feb11 0:7a1237bd2d13 274 addRoundKey(nr);
feb11 0:7a1237bd2d13 275
feb11 0:7a1237bd2d13 276 memcpy(out, state, 16);
feb11 0:7a1237bd2d13 277 }
feb11 0:7a1237bd2d13 278
feb11 0:7a1237bd2d13 279 void AES::encrypt(uint8_t *out, uint8_t *in, uint32_t length)
feb11 0:7a1237bd2d13 280 {
feb11 0:7a1237bd2d13 281 for(uint32_t i = 0; i < length; i+=16)
feb11 0:7a1237bd2d13 282 encryptBlock(&out[i], &in[i]);
feb11 0:7a1237bd2d13 283 }
feb11 0:7a1237bd2d13 284
feb11 0:7a1237bd2d13 285 void AES::decrypt(uint8_t *out, uint8_t *in, uint32_t length)
feb11 0:7a1237bd2d13 286 {
feb11 0:7a1237bd2d13 287 for(uint32_t i = 0; i < length; i+=16)
feb11 0:7a1237bd2d13 288 decryptBlock(&out[i], &in[i]);
feb11 0:7a1237bd2d13 289 }
feb11 0:7a1237bd2d13 290
feb11 0:7a1237bd2d13 291 uint32_t AES::getBlockSize() const
feb11 0:7a1237bd2d13 292 {
feb11 0:7a1237bd2d13 293 return 16;
feb11 0:7a1237bd2d13 294 }