summaryrefslogtreecommitdiffstats
path: root/tests/codeigniter/libraries/Encryption_test.php
blob: 96e52ada83825b1320a4d11c2b99f5879f85f661 (plain)
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
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
<?php

class Encryption_test extends CI_TestCase {

	public function set_up()
	{
		$this->encryption = new Mock_Libraries_Encryption();
	}

	// --------------------------------------------------------------------

	/**
	 * __construct test
	 *
	 * Covers behavior with $config['encryption_key'] set or not
	 */
	public function test___construct()
	{
		// Assume no configuration from set_up()
		$this->assertNull($this->encryption->get_key());

		// Try with an empty value
		$this->ci_set_config('encryption_key');
		$this->encrypt = new Mock_Libraries_Encryption();
		$this->assertNull($this->encrypt->get_key());

		$this->ci_set_config('encryption_key', str_repeat("\x0", 16));
		$this->encrypt = new Mock_Libraries_Encryption();
		$this->assertEquals(str_repeat("\x0", 16), $this->encrypt->get_key());
	}

	// --------------------------------------------------------------------

	/**
	 * hkdf() test
	 *
	 * Applies test vectors described in Appendix A(1-3) RFC5869.
	 * Described vectors 4-7 SHA-1, which we don't support and are
	 * therefore excluded.
	 *
	 * Because our implementation is a single method instead of being
	 * split into hkdf_extract() and hkdf_expand(), we cannot test for
	 * the PRK value. As long as the OKM is correct though, it's fine.
	 *
	 * @link	https://tools.ietf.org/rfc/rfc5869.txt
	 */
	public function test_hkdf()
	{
		$vectors = array(
			// A.1: Basic test case with SHA-256
			array(
				'digest' => 'sha256',
				'ikm' => "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b",
				'salt' => "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c",
				'length' => 42,
				'info' => "\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9",
			//	'prk' => "\x07\x77\x09\x36\x2c\x2e\x32\xdf\x0d\xdc\x3f\x0d\xc4\x7b\xba\x63\x90\xb6\xc7\x3b\xb5\x0f\x9c\x31\x22\xec\x84\x4a\xd7\xc2\xb3\xe5",
				'okm' => "\x3c\xb2\x5f\x25\xfa\xac\xd5\x7a\x90\x43\x4f\x64\xd0\x36\x2f\x2a\x2d\x2d\x0a\x90\xcf\x1a\x5a\x4c\x5d\xb0\x2d\x56\xec\xc4\xc5\xbf\x34\x00\x72\x08\xd5\xb8\x87\x18\x58\x65"
			),
			// A.2: Test with SHA-256 and longer inputs/outputs
			array(
				'digest' => 'sha256',
				'ikm' => "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20\x21\x22\x23\x24\x25\x26\x27\x28\x29\x2a\x2b\x2c\x2d\x2e\x2f\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x3a\x3b\x3c\x3d\x3e\x3f\x40\x41\x42\x43\x44\x45\x46\x47\x48\x49\x4a\x4b\x4c\x4d\x4e\x4f",
				'salt' => "\x60\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6a\x6b\x6c\x6d\x6e\x6f\x70\x71\x72\x73\x74\x75\x76\x77\x78\x79\x7a\x7b\x7c\x7d\x7e\x7f\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf",
				'length' => 82,
				'info' => "\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff",
			//	'prk' => "\x06\xa6\xb8\x8c\x58\x53\x36\x1a\x06\x10\x4c\x9c\xeb\x35\xb4\x5c\xef\x76\x00\x14\x90\x46\x71\x01\x4a\x19\x3f\x40\xc1\x5f\xc2\x44",
				'okm' => "\xb1\x1e\x39\x8d\xc8\x03\x27\xa1\xc8\xe7\xf7\x8c\x59\x6a\x49\x34\x4f\x01\x2e\xda\x2d\x4e\xfa\xd8\xa0\x50\xcc\x4c\x19\xaf\xa9\x7c\x59\x04\x5a\x99\xca\xc7\x82\x72\x71\xcb\x41\xc6\x5e\x59\x0e\x09\xda\x32\x75\x60\x0c\x2f\x09\xb8\x36\x77\x93\xa9\xac\xa3\xdb\x71\xcc\x30\xc5\x81\x79\xec\x3e\x87\xc1\x4c\x01\xd5\xc1\xf3\x43\x4f\x1d\x87",
			),
			// A.3: Test with SHA-256 and zero-length salt/info
			array(
				'digest' => 'sha256',
				'ikm' => "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b",
				'salt' => '',
				'length' => 42,
				'info' => '',
			//	'prk' => "\x19\xef\x24\xa3\x2c\x71\x7b\x16\x7f\x33\xa9\x1d\x6f\x64\x8b\xdf\x96\x59\x67\x76\xaf\xdb\x63\x77\xac\x43\x4c\x1c\x29\x3c\xcb\x04",
				'okm' => "\x8d\xa4\xe7\x75\xa5\x63\xc1\x8f\x71\x5f\x80\x2a\x06\x3c\x5a\x31\xb8\xa1\x1f\x5c\x5e\xe1\x87\x9e\xc3\x45\x4e\x5f\x3c\x73\x8d\x2d\x9d\x20\x13\x95\xfa\xa4\xb6\x1a\x96\xc8",
			)
		);

		foreach ($vectors as $test)
		{
			$this->assertEquals(
				$test['okm'],
				$this->encryption->hkdf(
					$test['ikm'],
					$test['digest'],
					$test['salt'],
					$test['length'],
					$test['info']
				)
			);
		}

		// Test default length, it must match the digest size
		$this->assertEquals(64, strlen($this->encryption->hkdf('foobar', 'sha512')));

		// Test maximum length (RFC5869 says that it must be up to 255 times the digest size)
		$this->assertEquals(12240, strlen($this->encryption->hkdf('foobar', 'sha384', NULL, 48 * 255)));
		$this->assertFalse($this->encryption->hkdf('foobar', 'sha224', NULL, 28 * 255 + 1));

		// CI-specific test for an invalid digest
		$this->assertFalse($this->encryption->hkdf('fobar', 'sha1'));
	}

	// --------------------------------------------------------------------

	/**
	 * _get_params() test
	 */
	public function test__get_params()
	{
		$key = str_repeat("\x0", 16);

		// Invalid custom parameters
		$params = array(
			// No cipher, mode or key
			array('cipher' => 'aes-128', 'mode' => 'cbc'),
			array('cipher' => 'aes-128', 'key' => $key),
			array('mode' => 'cbc', 'key' => $key),
			// No HMAC key or not a valid digest
			array('cipher' => 'aes-128', 'mode' => 'cbc', 'key' => $key),
			array('cipher' => 'aes-128', 'mode' => 'cbc', 'key' => $key, 'hmac_digest' => 'sha1', 'hmac_key' => $key),
			// Invalid mode
			array('cipher' => 'aes-128', 'mode' => 'foo', 'key' => $key, 'hmac_digest' => 'sha256', 'hmac_key' => $key)
		);

		for ($i = 0, $c = count($params); $i < $c; $i++)
		{
			$this->assertFalse($this->encryption->__get_params($params[$i]));
		}

		// Valid parameters
		$params = array(
			'cipher' => 'aes-128',
			'mode' => 'cbc',
			'key' => str_repeat("\x0", 16),
			'hmac_key' => str_repeat("\x0", 16)
		);

		$this->assertTrue(is_array($this->encryption->__get_params($params)));

		$params['base64'] = TRUE;
		$params['hmac_digest'] = 'sha512';

		// Including all parameters
		$params = array(
			'cipher' => 'aes-128',
			'mode' => 'cbc',
			'key' => str_repeat("\x0", 16),
			'raw_data' => TRUE,
			'hmac_key' => str_repeat("\x0", 16),
			'hmac_digest' => 'sha256'
		);

		$output = $this->encryption->__get_params($params);
		unset($output['handle'], $output['cipher'], $params['raw_data'], $params['cipher']);
		$params['base64'] = FALSE;
		$this->assertEquals($params, $output);

		// HMAC disabled
		unset($params['hmac_key'], $params['hmac_digest']);
		$params['hmac'] = $params['raw_data'] = FALSE;
		$params['cipher'] = 'aes-128';
		$output = $this->encryption->__get_params($params);
		unset($output['handle'], $output['cipher'], $params['hmac'], $params['raw_data'], $params['cipher']);
		$params['base64'] = TRUE;
		$params['hmac_digest'] = $params['hmac_key'] = NULL;
		$this->assertEquals($params, $output);
	}

	// --------------------------------------------------------------------

	/**
	 * initialize(), encrypt(), decrypt() test
	 *
	 * Testing the three methods separately is not realistic as they are
	 * designed to work together. A more thorough test for initialize()
	 * though is the OpenSSL/MCrypt compatibility test.
	 *
	 * @depends	test_hkdf
	 * @depends	test__get_params
	 */
	public function test_initialize_encrypt_decrypt()
	{
		$message = 'This is a plain-text message.';
		$key = "\xd0\xc9\x08\xc4\xde\x52\x12\x6e\xf8\xcc\xdb\x03\xea\xa0\x3a\x5c";

		// Default state (AES-128/Rijndael-128 in CBC mode)
		$this->encryption->initialize(array('key' => $key));

		// Was the key properly set?
		$this->assertEquals($key, $this->encryption->get_key());

		$this->assertEquals($message, $this->encryption->decrypt($this->encryption->encrypt($message)));

		// Try DES in ECB mode, just for the sake of changing stuff
		$this->encryption->initialize(array('cipher' => 'des', 'mode' => 'ecb', 'key' => substr($key, 0, 8)));
		$this->assertEquals($message, $this->encryption->decrypt($this->encryption->encrypt($message)));
	}

	// --------------------------------------------------------------------

	/**
	 * encrypt(), decrypt test with custom parameters
	 *
	 * @depends	test___get_params
	 */
	public function test_encrypt_decrypt_custom()
	{
		$message = 'Another plain-text message.';

		// A random invalid parameter
		$this->assertFalse($this->encryption->encrypt($message, array('foo')));
		$this->assertFalse($this->encryption->decrypt($message, array('foo')));

		// No HMAC, binary output
		$params = array(
			'cipher' => 'tripledes',
			'mode' => 'cfb',
			'key' => str_repeat("\x1", 16),
			'base64' => FALSE,
			'hmac' => FALSE
		);

		$ciphertext = $this->encryption->encrypt($message, $params);

		$this->assertEquals($message, $this->encryption->decrypt($ciphertext, $params));
	}

	// --------------------------------------------------------------------

	/**
	 * _mcrypt_get_handle() test
	 */
	public function test__mcrypt_get_handle()
	{
		if ($this->encryption->drivers['mcrypt'] === FALSE)
		{
			return $this->markTestSkipped('Cannot test MCrypt because it is not available.');
		}
		elseif (version_compare(PHP_VERSION, '7.1.0-alpha', '>='))
		{
			return $this->markTestSkipped('ext/mcrypt is deprecated since PHP 7.1 and will generate notices here.');
		}

		$this->assertTrue(is_resource($this->encryption->__driver_get_handle('mcrypt', 'rijndael-128', 'cbc')));
	}

	// --------------------------------------------------------------------

	/**
	 * _openssl_get_handle() test
	 */
	public function test__openssl_mcrypt_get_handle()
	{
		if ($this->encryption->drivers['openssl'] === FALSE)
		{
			return $this->markTestSkipped('Cannot test OpenSSL because it is not available.');
		}

		$this->assertEquals('aes-128-cbc', $this->encryption->__driver_get_handle('openssl', 'aes-128', 'cbc'));
		$this->assertEquals('rc4-40', $this->encryption->__driver_get_handle('openssl', 'rc4-40', 'stream'));
	}

	// --------------------------------------------------------------------

	/**
	 * OpenSSL/MCrypt portability test
	 *
	 * Amongst the obvious stuff, _cipher_alias() is also tested here.
	 */
	public function test_portability()
	{
		if ( ! $this->encryption->drivers['mcrypt'] OR ! $this->encryption->drivers['openssl'])
		{
			$this->markTestSkipped('Both MCrypt and OpenSSL support are required for portability tests.');
			return;
		}
		elseif (version_compare(PHP_VERSION, '7.1.0-alpha', '>='))
		{
			return $this->markTestSkipped('ext/mcrypt is deprecated since PHP 7.1 and will generate notices here.');
		}

		$message = 'This is a message encrypted via MCrypt and decrypted via OpenSSL, or vice-versa.';

		// Format is: <Cipher name>, <Cipher mode>, <Key size>
		$portable = array(
			array('aes-128', 'cbc', 16),
			array('aes-128', 'cfb', 16),
			array('aes-128', 'cfb8', 16),
			array('aes-128', 'ofb', 16),
			array('aes-128', 'ecb', 16),
			array('aes-128', 'ctr', 16),
			array('aes-192', 'cbc', 24),
			array('aes-192', 'cfb', 24),
			array('aes-192', 'cfb8', 24),
			array('aes-192', 'ofb', 24),
			array('aes-192', 'ecb', 24),
			array('aes-192', 'ctr', 24),
			array('aes-256', 'cbc', 32),
			array('aes-256', 'cfb', 32),
			array('aes-256', 'cfb8', 32),
			array('aes-256', 'ofb', 32),
			array('aes-256', 'ecb', 32),
			array('aes-256', 'ctr', 32),
			array('des', 'cbc', 7),
			array('des', 'cfb', 7),
			array('des', 'cfb8', 7),
			array('des', 'ofb', 7),
			array('des', 'ecb', 7),
			array('tripledes', 'cbc', 7),
			array('tripledes', 'cfb', 7),
			array('tripledes', 'cfb8', 7),
			array('tripledes', 'ofb', 7),
			array('tripledes', 'cbc', 14),
			array('tripledes', 'cfb', 14),
			array('tripledes', 'cfb8', 14),
			array('tripledes', 'ofb', 14),
			array('tripledes', 'cbc', 21),
			array('tripledes', 'cfb', 21),
			array('tripledes', 'cfb8', 21),
			array('tripledes', 'ofb', 21),
			array('blowfish', 'cbc', 16),
			array('blowfish', 'cfb', 16),
			array('blowfish', 'ofb', 16),
			array('blowfish', 'ecb', 16),
			array('blowfish', 'cbc', 56),
			array('blowfish', 'cfb', 56),
			array('blowfish', 'ofb', 56),
			array('blowfish', 'ecb', 56),
			array('cast5', 'cbc', 11),
			array('cast5', 'cfb', 11),
			array('cast5', 'ofb', 11),
			array('cast5', 'ecb', 11),
			array('cast5', 'cbc', 16),
			array('cast5', 'cfb', 16),
			array('cast5', 'ofb', 16),
			array('cast5', 'ecb', 16),
			array('rc4', 'stream', 5),
			array('rc4', 'stream', 8),
			array('rc4', 'stream', 16),
			array('rc4', 'stream', 32),
			array('rc4', 'stream', 64),
			array('rc4', 'stream', 128),
			array('rc4', 'stream', 256)
		);
		$driver_index = array('mcrypt', 'openssl');

		foreach ($portable as &$test)
		{
			// Add some randomness to the selected driver
			$driver = mt_rand(0,1);
			$params = array(
				'driver' => $driver_index[$driver],
				'cipher' => $test[0],
				'mode' => $test[1],
				'key' => openssl_random_pseudo_bytes($test[2])
			);

			$this->encryption->initialize($params);
			$ciphertext = $this->encryption->encrypt($message);

			$driver = (int) ! $driver;
			$params['driver'] = $driver_index[$driver];

			$this->encryption->initialize($params);
			$this->assertEquals($message, $this->encryption->decrypt($ciphertext));
		}
	}

	// --------------------------------------------------------------------

	/**
	 * __get() test
	 */
	public function test_magic_get()
	{
		$this->assertNull($this->encryption->foo);
		$this->assertEquals(array('mcrypt', 'openssl'), array_keys($this->encryption->drivers));

		// 'stream' mode is translated into an empty string for OpenSSL
		$this->encryption->initialize(array('cipher' => 'rc4', 'mode' => 'stream'));
		$this->assertEquals('stream', $this->encryption->mode);
	}

}