LCOV - code coverage report
Current view: top level - zxid - ykaes.c (source / functions) Hit Total Coverage
Test: ZXID Code Coverage Lines: 0 60 0.0 %
Date: 2010-12-19 Functions: 0 2 0.0 %
Branches: 0 18 0.0 %

           Branch data     Line data    Source code
       1                 :            : /* ykaes.c --- Implementation of AES-128.
       2                 :            :  *
       3                 :            :  * Copyright (c) 2006, 2007, 2008, 2009 Yubico AB
       4                 :            :  * All rights reserved.
       5                 :            :  *
       6                 :            :  * Redistribution and use in source and binary forms, with or without
       7                 :            :  * modification, are permitted provided that the following conditions are
       8                 :            :  * met:
       9                 :            :  *
      10                 :            :  *    * Redistributions of source code must retain the above copyright
      11                 :            :  *      notice, this list of conditions and the following disclaimer.
      12                 :            :  *
      13                 :            :  *    * Redistributions in binary form must reproduce the above
      14                 :            :  *      copyright notice, this list of conditions and the following
      15                 :            :  *      disclaimer in the documentation and/or other materials provided
      16                 :            :  *      with the distribution.
      17                 :            :  *
      18                 :            :  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      19                 :            :  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      20                 :            :  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      21                 :            :  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      22                 :            :  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      23                 :            :  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      24                 :            :  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      25                 :            :  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      26                 :            :  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      27                 :            :  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      28                 :            :  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      29                 :            :  *
      30                 :            :  */
      31                 :            : 
      32                 :            : #include "yubikey.h"
      33                 :            : 
      34                 :            : #define NUMBER_OF_ROUNDS        10
      35                 :            : 
      36                 :            : static const unsigned char RC[] =
      37                 :            :   { 0x1, 0x2, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80, 0x1B, 0x36 };
      38                 :            : 
      39                 :            : static const unsigned char rijndael_sbox[] = {
      40                 :            :   0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5,
      41                 :            :   0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
      42                 :            :   0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0,
      43                 :            :   0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
      44                 :            :   0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC,
      45                 :            :   0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
      46                 :            :   0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A,
      47                 :            :   0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
      48                 :            :   0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0,
      49                 :            :   0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
      50                 :            :   0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B,
      51                 :            :   0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
      52                 :            :   0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85,
      53                 :            :   0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
      54                 :            :   0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5,
      55                 :            :   0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
      56                 :            :   0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17,
      57                 :            :   0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
      58                 :            :   0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88,
      59                 :            :   0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
      60                 :            :   0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C,
      61                 :            :   0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
      62                 :            :   0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9,
      63                 :            :   0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
      64                 :            :   0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6,
      65                 :            :   0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
      66                 :            :   0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E,
      67                 :            :   0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
      68                 :            :   0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94,
      69                 :            :   0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
      70                 :            :   0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68,
      71                 :            :   0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16
      72                 :            : };
      73                 :            : 
      74                 :            : static const unsigned char rijndael_inv_sbox[] = {
      75                 :            :   0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38,
      76                 :            :   0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB,
      77                 :            :   0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87,
      78                 :            :   0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB,
      79                 :            :   0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D,
      80                 :            :   0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E,
      81                 :            :   0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2,
      82                 :            :   0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25,
      83                 :            :   0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16,
      84                 :            :   0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92,
      85                 :            :   0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA,
      86                 :            :   0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84,
      87                 :            :   0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A,
      88                 :            :   0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06,
      89                 :            :   0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02,
      90                 :            :   0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B,
      91                 :            :   0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA,
      92                 :            :   0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73,
      93                 :            :   0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85,
      94                 :            :   0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E,
      95                 :            :   0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89,
      96                 :            :   0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B,
      97                 :            :   0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20,
      98                 :            :   0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4,
      99                 :            :   0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31,
     100                 :            :   0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F,
     101                 :            :   0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D,
     102                 :            :   0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF,
     103                 :            :   0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0,
     104                 :            :   0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61,
     105                 :            :   0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26,
     106                 :            :   0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D
     107                 :            : };
     108                 :            : 
     109                 :            : /* Called by:  yubikey_aes_decrypt x7 */
     110                 :            : static /*inline*/ unsigned char
     111                 :            : xtime (unsigned char b)
     112                 :          0 : {
     113         [ #  # ]:          0 :   return (b & 0x80) ? ((b << 1) ^ 0x1b) : (b << 1);
     114                 :            : }
     115                 :            : 
     116                 :            : /* Called by:  main, zxid_pw_authn */
     117                 :            : void
     118                 :            : yubikey_aes_decrypt (unsigned char * state, const unsigned char * key)
     119                 :          0 : {
     120                 :            :   unsigned char i, j, round_key[0x10];
     121                 :            :   unsigned char a02x, a13x;
     122                 :            :   unsigned char a02xx, a13xx;
     123                 :            :   unsigned char k1, k2;
     124                 :            : 
     125                 :          0 :   memcpy (round_key, key, sizeof (round_key));
     126         [ #  # ]:          0 :   for (i = 0; i < NUMBER_OF_ROUNDS; i++)
     127                 :            :     {
     128                 :          0 :       round_key[0] ^= RC[i];
     129                 :            : 
     130                 :          0 :       round_key[0] ^= rijndael_sbox[round_key[13]];
     131                 :          0 :       round_key[1] ^= rijndael_sbox[round_key[14]];
     132                 :          0 :       round_key[2] ^= rijndael_sbox[round_key[15]];
     133                 :          0 :       round_key[3] ^= rijndael_sbox[round_key[12]];
     134                 :            : 
     135         [ #  # ]:          0 :       for (j = 4; j < 16; j++)
     136                 :          0 :         round_key[j] ^= round_key[j - 4];
     137                 :            :     }
     138         [ #  # ]:          0 :   for (i = 0; i < 0x10; i++)
     139                 :          0 :     state[i] ^= round_key[i];
     140                 :            : 
     141         [ #  # ]:          0 :   for (i = 1; i <= NUMBER_OF_ROUNDS; i++)
     142                 :            :     {
     143                 :            :       // inv_byte_sub_shift_row();
     144                 :            : 
     145                 :            :       /* First row: 0 shift, 0 4 8 12 */
     146                 :          0 :       state[0] = rijndael_inv_sbox[state[0]];
     147                 :          0 :       state[4] = rijndael_inv_sbox[state[4]];
     148                 :          0 :       state[8] = rijndael_inv_sbox[state[8]];
     149                 :          0 :       state[12] = rijndael_inv_sbox[state[12]];
     150                 :            : 
     151                 :            :       /* Second row: -1 shift, 1 5 9 13 */
     152                 :          0 :       j = state[13];
     153                 :          0 :       state[13] = rijndael_inv_sbox[state[9]];
     154                 :          0 :       state[9] = rijndael_inv_sbox[state[5]];
     155                 :          0 :       state[5] = rijndael_inv_sbox[state[1]];
     156                 :          0 :       state[1] = rijndael_inv_sbox[j];
     157                 :            : 
     158                 :            :       /* Third row: -2 shift, 2 6 10 14 */
     159                 :          0 :       j = state[2];
     160                 :          0 :       state[2] = rijndael_inv_sbox[state[10]];
     161                 :          0 :       state[10] = rijndael_inv_sbox[j];
     162                 :          0 :       j = state[6];
     163                 :          0 :       state[6] = rijndael_inv_sbox[state[14]];
     164                 :          0 :       state[14] = rijndael_inv_sbox[j];
     165                 :            : 
     166                 :            :       /* Fourth row: -3 shift, 3 7 11 15 */
     167                 :          0 :       j = state[3];
     168                 :          0 :       state[3] = rijndael_inv_sbox[state[7]];
     169                 :          0 :       state[7] = rijndael_inv_sbox[state[11]];
     170                 :          0 :       state[11] = rijndael_inv_sbox[state[15]];
     171                 :          0 :       state[15] = rijndael_inv_sbox[j];
     172                 :            : 
     173                 :            : //              get_inv_round_key(i);
     174                 :            : 
     175         [ #  # ]:          0 :       for (j = 15; j > 3; j--)
     176                 :          0 :         round_key[j] ^= round_key[j - 4];
     177                 :            : 
     178                 :          0 :       round_key[0] ^=
     179                 :            :         (RC[NUMBER_OF_ROUNDS - i] ^ rijndael_sbox[round_key[13]]);
     180                 :            : 
     181                 :          0 :       round_key[1] ^= rijndael_sbox[round_key[14]];
     182                 :          0 :       round_key[2] ^= rijndael_sbox[round_key[15]];
     183                 :          0 :       round_key[3] ^= rijndael_sbox[round_key[12]];
     184                 :            : 
     185         [ #  # ]:          0 :       for (j = 0; j < 16; j++)
     186                 :          0 :         state[j] ^= round_key[j];
     187         [ #  # ]:          0 :       if (i != NUMBER_OF_ROUNDS)
     188                 :            :         {
     189                 :            : 
     190                 :            :           //inv_mix_column();
     191                 :            : 
     192         [ #  # ]:          0 :           for (j = 0; j < 16; j += 4)
     193                 :            :             {
     194                 :          0 :               k1 = state[j] ^ state[j + 2];
     195                 :          0 :               a02x = xtime (k1);
     196                 :          0 :               k2 = state[j + 1] ^ state[j + 3];
     197                 :          0 :               a13x = xtime (k2);
     198                 :            : 
     199                 :          0 :               k1 ^= (k2 ^ xtime (state[j + 1] ^ state[j + 2]));
     200                 :          0 :               k2 = k1;
     201                 :            : 
     202                 :          0 :               a02xx = xtime (a02x);
     203                 :          0 :               a13xx = xtime (a13x);
     204                 :            : 
     205                 :          0 :               k1 ^= (xtime (a02xx ^ a13xx) ^ a02xx);
     206                 :          0 :               k2 ^= (xtime (a02xx ^ a13xx) ^ a13xx);
     207                 :            : 
     208                 :          0 :               state[j] ^= (k1 ^ a02x);
     209                 :          0 :               state[j + 1] ^= k2;
     210                 :          0 :               state[j + 2] ^= (k1 ^ a13x);
     211                 :          0 :               state[j + 3] ^= (k2 ^ a02x ^ a13x);
     212                 :            :             }
     213                 :            :         }
     214                 :            : 
     215                 :            :     }
     216                 :          0 : }

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