Skip to content
Navigation Menu
{{ message }}
forked from bcit-ci/CodeIgniter
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathEncrypt.php
More file actions
507 lines (435 loc) · 11.1 KB
/
Copy pathEncrypt.php
File metadata and controls
507 lines (435 loc) · 11.1 KB
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
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.2.4 or newer
*
* NOTICE OF LICENSE
*
* Licensed under the Open Software License version 3.0
*
* This source file is subject to the Open Software License (OSL 3.0) that is
* bundled with this package in the files license.txt / license.rst. It is
* also available through the world wide web at this URL:
* http://opensource.org/licenses/OSL-3.0
* If you did not receive a copy of the license and are unable to obtain it
* through the world wide web, please send an email to
* licensing@ellislab.com so we can send you a copy immediately.
*
* @package CodeIgniter
* @author EllisLab Dev Team
* @copyright Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/)
* @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
* @link http://codeigniter.com
* @since Version 1.0
* @filesource
*/
defined('BASEPATH') OR exit('No direct script access allowed');
/**
* CodeIgniter Encryption Class
*
* Provides two-way keyed encoding using XOR Hashing and Mcrypt
*
* @package CodeIgniter
* @subpackage Libraries
* @category Libraries
* @author EllisLab Dev Team
* @link http://codeigniter.com/user_guide/libraries/encryption.html
*/
class CI_Encrypt {
/**
* Reference to the user's encryption key
*
* @var string
*/
public $encryption_key = '';
/**
* Type of hash operation
*
* @var string
*/
protected $_hash_type = 'sha1';
/**
* Flag for the existance of mcrypt
*
* @var bool
*/
protected $_mcrypt_exists = FALSE;
/**
* Current cipher to be used with mcrypt
*
* @var string
*/
protected $_mcrypt_cipher;
/**
* Method for encrypting/decrypting data
*
* @var int
*/
protected $_mcrypt_mode;
/**
* Initialize Encryption class
*
* @return void
*/
public function __construct()
{
$this->_mcrypt_exists = function_exists('mcrypt_encrypt');
log_message('debug', 'Encrypt Class Initialized');
}
// --------------------------------------------------------------------
/**
* Fetch the encryption key
*
* Returns it as MD5 in order to have an exact-length 128 bit key.
* Mcrypt is sensitive to keys that are not the correct length
*
* @param string
* @return string
*/
public function get_key($key = '')
{
if ($key === '')
{
if ($this->encryption_key !== '')
{
return $this->encryption_key;
}
$key = config_item('encryption_key');
if ($key === FALSE)
{
show_error('In order to use the encryption class requires that you set an encryption key in your config file.');
}
}
return md5($key);
}
// --------------------------------------------------------------------
/**
* Set the encryption key
*
* @param string
* @return object
*/
public function set_key($key = '')
{
$this->encryption_key = $key;
return $this;
}
// --------------------------------------------------------------------
/**
* Encode
*
* Encodes the message string using bitwise XOR encoding.
* The key is combined with a random hash, and then it
* too gets converted using XOR. The whole thing is then run
* through mcrypt (if supported) using the randomized key.
* The end result is a double-encrypted message string
* that is randomized with each call to this function,
* even if the supplied message and key are the same.
*
* @param string the string to encode
* @param string the key
* @return string
*/
public function encode($string, $key = '')
{
$method = ($this->_mcrypt_exists === TRUE) ? 'mcrypt_encode' : '_xor_encode';
return base64_encode($this->$method($string, $this->get_key($key)));
}
// --------------------------------------------------------------------
/**
* Decode
*
* Reverses the above process
*
* @param string
* @param string
* @return string
*/
public function decode($string, $key = '')
{
if (preg_match('/[^a-zA-Z0-9\/\+=]/', $string) OR base64_encode(base64_decode($string)) !== $string)
{
return FALSE;
}
$method = ($this->_mcrypt_exists === TRUE) ? 'mcrypt_decode' : '_xor_decode';
return $this->$method(base64_decode($string), $this->get_key($key));
}
// --------------------------------------------------------------------
/**
* Encode from Legacy
*
* Takes an encoded string from the original Encryption class algorithms and
* returns a newly encoded string using the improved method added in 2.0.0
* This allows for backwards compatibility and a method to transition to the
* new encryption algorithms.
*
* For more details, see http://codeigniter.com/user_guide/installation/upgrade_200.html#encryption
*
* @param string
* @param int (mcrypt mode constant)
* @param string
* @return string
*/
public function encode_from_legacy($string, $legacy_mode = MCRYPT_MODE_ECB, $key = '')
{
if ($this->_mcrypt_exists === FALSE)
{
log_message('error', 'Encoding from legacy is available only when Mcrypt is in use.');
return FALSE;
}
elseif (preg_match('/[^a-zA-Z0-9\/\+=]/', $string))
{
return FALSE;
}
// decode it first
// set mode temporarily to what it was when string was encoded with the legacy
// algorithm - typically MCRYPT_MODE_ECB
$current_mode = $this->_get_mode();
$this->set_mode($legacy_mode);
$key = $this->get_key($key);
$dec = base64_decode($string);
if (($dec = $this->mcrypt_decode($dec, $key)) === FALSE)
{
$this->set_mode($current_mode);
return FALSE;
}
$dec = $this->_xor_decode($dec, $key);
// set the mcrypt mode back to what it should be, typically MCRYPT_MODE_CBC
$this->set_mode($current_mode);
// and re-encode
return base64_encode($this->mcrypt_encode($dec, $key));
}
// --------------------------------------------------------------------
/**
* XOR Encode
*
* Takes a plain-text string and key as input and generates an
* encoded bit-string using XOR
*
* @param string
* @param string
* @return string
*/
protected function _xor_encode($string, $key)
{
$rand = '';
do
{
$rand .= mt_rand(0, mt_getrandmax());
}
while (strlen($rand) < 32);
$rand = $this->hash($rand);
$enc = '';
for ($i = 0, $ls = strlen($string), $lr = strlen($rand); $i < $ls; $i++)
{
$enc .= $rand[($i % $lr)].($rand[($i % $lr)] ^ $string[$i]);
}
return $this->_xor_merge($enc, $key);
}
// --------------------------------------------------------------------
/**
* XOR Decode
*
* Takes an encoded string and key as input and generates the
* plain-text original message
*
* @param string
* @param string
* @return string
*/
protected function _xor_decode($string, $key)
{
$string = $this->_xor_merge($string, $key);
$dec = '';
for ($i = 0, $l = strlen($string); $i < $l; $i++)
{
$dec .= ($string[$i++] ^ $string[$i]);
}
return $dec;
}
// --------------------------------------------------------------------
/**
* XOR key + string Combiner
*
* Takes a string and key as input and computes the difference using XOR
*
* @param string
* @param string
* @return string
*/
protected function _xor_merge($string, $key)
{
$hash = $this->hash($key);
$str = '';
for ($i = 0, $ls = strlen($string), $lh = strlen($hash); $i < $ls; $i++)
{
$str .= $string[$i] ^ $hash[($i % $lh)];
}
return $str;
}
// --------------------------------------------------------------------
/**
* Encrypt using Mcrypt
*
* @param string
* @param string
* @return string
*/
public function mcrypt_encode($data, $key)
{
$init_size = mcrypt_get_iv_size($this->_get_cipher(), $this->_get_mode());
$init_vect = mcrypt_create_iv($init_size, MCRYPT_RAND);
return $this->_add_cipher_noise($init_vect.mcrypt_encrypt($this->_get_cipher(), $key, $data, $this->_get_mode(), $init_vect), $key);
}
// --------------------------------------------------------------------
/**
* Decrypt using Mcrypt
*
* @param string
* @param string
* @return string
*/
public function mcrypt_decode($data, $key)
{
$data = $this->_remove_cipher_noise($data, $key);
$init_size = mcrypt_get_iv_size($this->_get_cipher(), $this->_get_mode());
if ($init_size > strlen($data))
{
return FALSE;
}
$init_vect = substr($data, 0, $init_size);
$data = substr($data, $init_size);
return rtrim(mcrypt_decrypt($this->_get_cipher(), $key, $data, $this->_get_mode(), $init_vect), "\0");
}
// --------------------------------------------------------------------
/**
* Adds permuted noise to the IV + encrypted data to protect
* against Man-in-the-middle attacks on CBC mode ciphers
* http://www.ciphersbyritter.com/GLOSSARY.HTM#IV
*
* @param string
* @param string
* @return string
*/
protected function _add_cipher_noise($data, $key)
{
$key = $this->hash($key);
$str = '';
for ($i = 0, $j = 0, $ld = strlen($data), $lk = strlen($key); $i < $ld; ++$i, ++$j)
{
if ($j >= $lk)
{
$j = 0;
}
$str .= chr((ord($data[$i]) + ord($key[$j])) % 256);
}
return $str;
}
// --------------------------------------------------------------------
/**
* Removes permuted noise from the IV + encrypted data, reversing
* _add_cipher_noise()
*
* Function description
*
* @param string $data
* @param string $key
* @return string
*/
protected function _remove_cipher_noise($data, $key)
{
$key = $this->hash($key);
$str = '';
for ($i = 0, $j = 0, $ld = strlen($data), $lk = strlen($key); $i < $ld; ++$i, ++$j)
{
if ($j >= $lk)
{
$j = 0;
}
$temp = ord($data[$i]) - ord($key[$j]);
if ($temp < 0)
{
$temp += 256;
}
$str .= chr($temp);
}
return $str;
}
// --------------------------------------------------------------------
/**
* Set the Mcrypt Cipher
*
* @param int
* @return object
*/
public function set_cipher($cipher)
{
$this->_mcrypt_cipher = $cipher;
return $this;
}
// --------------------------------------------------------------------
/**
* Set the Mcrypt Mode
*
* @param int
* @return object
*/
public function set_mode($mode)
{
$this->_mcrypt_mode = $mode;
return $this;
}
// --------------------------------------------------------------------
/**
* Get Mcrypt cipher Value
*
* @return int
*/
protected function _get_cipher()
{
if ($this->_mcrypt_cipher === NULL)
{
return $this->_mcrypt_cipher = MCRYPT_RIJNDAEL_256;
}
return $this->_mcrypt_cipher;
}
// --------------------------------------------------------------------
/**
* Get Mcrypt Mode Value
*
* @return int
*/
protected function _get_mode()
{
if ($this->_mcrypt_mode === NULL)
{
return $this->_mcrypt_mode = MCRYPT_MODE_CBC;
}
return $this->_mcrypt_mode;
}
// --------------------------------------------------------------------
/**
* Set the Hash type
*
* @param string
* @return void
*/
public function set_hash($type = 'sha1')
{
$this->_hash_type = in_array($type, hash_algos()) ? $type : 'sha1';
}
// --------------------------------------------------------------------
/**
* Hash encode a string
*
* @param string
* @return string
*/
public function hash($str)
{
return hash($this->_hash_type, $str);
}
}
/* End of file Encrypt.php */
/* Location: ./system/libraries/Encrypt.php */
You can’t perform that action at this time.