aboutsummaryrefslogtreecommitdiff
path: root/src/util/test_crypto_aes_weak.c
blob: a694b64818e61815e756ddc73aece57ab82a67f4 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
/*
     This file is part of GNUnet.
     (C) 2003, 2004, 2005, 2006 Christian Grothoff (and other contributing authors)

     GNUnet is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published
     by the Free Software Foundation; either version 2, or (at your
     option) any later version.

     GNUnet is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with GNUnet; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
     Boston, MA 02111-1307, USA.

*/

/**
 * @author Krista Bennett
 * @author Christian Grothoff
 * @file util/test_crypto_aes_weak.c
 * @brief AES weak key test.
 */
#include "platform.h"
#include "gnunet_common.h"
#include "gnunet_crypto_lib.h"
#include <gcrypt.h>

#define MAX_WEAK_KEY_TRIALS 100000
#define GENERATE_WEAK_KEYS GNUNET_NO
#define WEAK_KEY_TESTSTRING "I hate weak keys."

static void
printWeakKey (struct GNUNET_CRYPTO_AesSessionKey *key)
{
  int i;
  for (i = 0; i < GNUNET_CRYPTO_AES_KEY_LENGTH; i++)
    {
      printf ("%x ", (int) (key->key[i]));
    }
}

static int
testWeakKey ()
{
  char result[100];
  char res[100];
  int size;
  struct GNUNET_CRYPTO_AesSessionKey weak_key;
  struct GNUNET_CRYPTO_AesInitializationVector INITVALUE;

  memset (&INITVALUE, 42,
          sizeof (struct GNUNET_CRYPTO_AesInitializationVector));
  /* sorry, this is not a weak key -- I don't have
     any at the moment! */
  weak_key.key[0] = (char) (0x4c);
  weak_key.key[1] = (char) (0x31);
  weak_key.key[2] = (char) (0xc6);
  weak_key.key[3] = (char) (0x2b);
  weak_key.key[4] = (char) (0xc1);
  weak_key.key[5] = (char) (0x5f);
  weak_key.key[6] = (char) (0x4d);
  weak_key.key[7] = (char) (0x1f);
  weak_key.key[8] = (char) (0x31);
  weak_key.key[9] = (char) (0xaa);
  weak_key.key[10] = (char) (0x12);
  weak_key.key[11] = (char) (0x2e);
  weak_key.key[12] = (char) (0xb7);
  weak_key.key[13] = (char) (0x82);
  weak_key.key[14] = (char) (0xc0);
  weak_key.key[15] = (char) (0xb6);
  weak_key.key[16] = (char) (0x4d);
  weak_key.key[17] = (char) (0x1f);
  weak_key.key[18] = (char) (0x31);
  weak_key.key[19] = (char) (0xaa);
  weak_key.key[20] = (char) (0x4c);
  weak_key.key[21] = (char) (0x31);
  weak_key.key[22] = (char) (0xc6);
  weak_key.key[23] = (char) (0x2b);
  weak_key.key[24] = (char) (0xc1);
  weak_key.key[25] = (char) (0x5f);
  weak_key.key[26] = (char) (0x4d);
  weak_key.key[27] = (char) (0x1f);
  weak_key.key[28] = (char) (0x31);
  weak_key.key[29] = (char) (0xaa);
  weak_key.key[30] = (char) (0xaa);
  weak_key.key[31] = (char) (0xaa);
  /* memset(&weak_key, 0, 32); */
  weak_key.crc32 =
    htonl (GNUNET_CRYPTO_crc32_n (&weak_key, GNUNET_CRYPTO_AES_KEY_LENGTH));

  size = GNUNET_CRYPTO_aes_encrypt (WEAK_KEY_TESTSTRING,
                                    strlen (WEAK_KEY_TESTSTRING) + 1,
                                    &weak_key, &INITVALUE, result);

  if (size == -1)
    {
      GNUNET_break (0);
      return 1;
    }

  size = GNUNET_CRYPTO_aes_decrypt (result, size, &weak_key, &INITVALUE, res);

  if ((strlen (WEAK_KEY_TESTSTRING) + 1) != size)
    {
      GNUNET_break (0);
      return 1;
    }
  if (0 != strcmp (res, WEAK_KEY_TESTSTRING))
    {
      GNUNET_break (0);
      return 1;
    }
  else
    return 0;
}

static int
getWeakKeys ()
{
  struct GNUNET_CRYPTO_AesSessionKey sessionkey;
  int number_of_weak_keys = 0;
  int number_of_runs;

  gcry_cipher_hd_t handle;
  int rc;

  for (number_of_runs = 0; number_of_runs < MAX_WEAK_KEY_TRIALS;
       number_of_runs++)
    {

      if (number_of_runs % 1000 == 0)
        fprintf (stderr, ".");
      /*printf("Got to run number %d.\n", number_of_runs); */
      GNUNET_CRYPTO_aes_create_session_key (&sessionkey);

      rc = gcry_cipher_open (&handle,
                             GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_CFB, 0);

      if (rc)
        {
          printf ("testweakkey: gcry_cipher_open failed on trial %d. %s\n",
                  number_of_runs, gcry_strerror (rc));
          continue;
        }

      rc =
        gcry_cipher_setkey (handle, &sessionkey,
                            GNUNET_CRYPTO_AES_KEY_LENGTH);

      if ((char) rc == GPG_ERR_WEAK_KEY)
        {
          printf ("\nWeak key (in hex): ");
          printWeakKey (&sessionkey);
          printf ("\n");
          number_of_weak_keys++;
        }
      else if (rc)
        {
          printf ("\nUnexpected error generating keys. Error is %s\n",
                  gcry_strerror (rc));
        }

      gcry_cipher_close (handle);

    }

  return number_of_weak_keys;
}

int
main (int argc, char *argv[])
{
  int weak_keys;

  GNUNET_log_setup ("test-crypto-aes-weak", "WARNING", NULL);
  GNUNET_CRYPTO_random_disable_entropy_gathering ();
  if (GENERATE_WEAK_KEYS)
    {
      weak_keys = getWeakKeys ();

      if (weak_keys == 0)
        {
          printf ("\nNo weak keys found in %d runs.\n", MAX_WEAK_KEY_TRIALS);
        }
      else
        {
          printf ("\n%d weak keys found in %d runs.\n",
                  weak_keys, MAX_WEAK_KEY_TRIALS);
        }
    }

  if (testWeakKey () != 0)
    return -1;
  return 0;
}

/* end of weakkeytest.c */