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59c06b17 CS |
1 | <?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); |
2 | /** | |
3 | * CodeIgniter | |
4 | * | |
5 | * An open source application development framework for PHP 5.1.6 or newer | |
6 | * | |
7 | * @package CodeIgniter | |
8 | * @author ExpressionEngine Dev Team | |
9 | * @copyright Copyright (c) 2008 - 2011, EllisLab, Inc. | |
10 | * @license http://codeigniter.com/user_guide/license.html | |
11 | * @link http://codeigniter.com | |
12 | * @since Version 1.0 | |
13 | * @filesource | |
14 | */ | |
15 | ||
16 | // ------------------------------------------------------------------------ | |
17 | ||
18 | /** | |
19 | * SHA1 Encoding Class | |
20 | * | |
21 | * Purpose: Provides 160 bit hashing using The Secure Hash Algorithm | |
22 | * developed at the National Institute of Standards and Technology. The 40 | |
23 | * character SHA1 message hash is computationally infeasible to crack. | |
24 | * | |
25 | * This class is a fallback for servers that are not running PHP greater than | |
26 | * 4.3, or do not have the MHASH library. | |
27 | * | |
28 | * This class is based on two scripts: | |
29 | * | |
30 | * Marcus Campbell's PHP implementation (GNU license) | |
31 | * http://www.tecknik.net/sha-1/ | |
32 | * | |
33 | * ...which is based on Paul Johnston's JavaScript version | |
34 | * (BSD license). http://pajhome.org.uk/ | |
35 | * | |
36 | * I encapsulated the functions and wrote one additional method to fix | |
37 | * a hex conversion bug. - Rick Ellis | |
38 | * | |
39 | * @package CodeIgniter | |
40 | * @subpackage Libraries | |
41 | * @category Encryption | |
42 | * @author ExpressionEngine Dev Team | |
43 | * @link http://codeigniter.com/user_guide/general/encryption.html | |
44 | */ | |
45 | class CI_SHA1 { | |
46 | ||
47 | public function __construct() | |
48 | { | |
49 | log_message('debug', "SHA1 Class Initialized"); | |
50 | } | |
51 | ||
52 | /** | |
53 | * Generate the Hash | |
54 | * | |
55 | * @access public | |
56 | * @param string | |
57 | * @return string | |
58 | */ | |
59 | function generate($str) | |
60 | { | |
61 | $n = ((strlen($str) + 8) >> 6) + 1; | |
62 | ||
63 | for ($i = 0; $i < $n * 16; $i++) | |
64 | { | |
65 | $x[$i] = 0; | |
66 | } | |
67 | ||
68 | for ($i = 0; $i < strlen($str); $i++) | |
69 | { | |
70 | $x[$i >> 2] |= ord(substr($str, $i, 1)) << (24 - ($i % 4) * 8); | |
71 | } | |
72 | ||
73 | $x[$i >> 2] |= 0x80 << (24 - ($i % 4) * 8); | |
74 | ||
75 | $x[$n * 16 - 1] = strlen($str) * 8; | |
76 | ||
77 | $a = 1732584193; | |
78 | $b = -271733879; | |
79 | $c = -1732584194; | |
80 | $d = 271733878; | |
81 | $e = -1009589776; | |
82 | ||
83 | for ($i = 0; $i < count($x); $i += 16) | |
84 | { | |
85 | $olda = $a; | |
86 | $oldb = $b; | |
87 | $oldc = $c; | |
88 | $oldd = $d; | |
89 | $olde = $e; | |
90 | ||
91 | for ($j = 0; $j < 80; $j++) | |
92 | { | |
93 | if ($j < 16) | |
94 | { | |
95 | $w[$j] = $x[$i + $j]; | |
96 | } | |
97 | else | |
98 | { | |
99 | $w[$j] = $this->_rol($w[$j - 3] ^ $w[$j - 8] ^ $w[$j - 14] ^ $w[$j - 16], 1); | |
100 | } | |
101 | ||
102 | $t = $this->_safe_add($this->_safe_add($this->_rol($a, 5), $this->_ft($j, $b, $c, $d)), $this->_safe_add($this->_safe_add($e, $w[$j]), $this->_kt($j))); | |
103 | ||
104 | $e = $d; | |
105 | $d = $c; | |
106 | $c = $this->_rol($b, 30); | |
107 | $b = $a; | |
108 | $a = $t; | |
109 | } | |
110 | ||
111 | $a = $this->_safe_add($a, $olda); | |
112 | $b = $this->_safe_add($b, $oldb); | |
113 | $c = $this->_safe_add($c, $oldc); | |
114 | $d = $this->_safe_add($d, $oldd); | |
115 | $e = $this->_safe_add($e, $olde); | |
116 | } | |
117 | ||
118 | return $this->_hex($a).$this->_hex($b).$this->_hex($c).$this->_hex($d).$this->_hex($e); | |
119 | } | |
120 | ||
121 | // -------------------------------------------------------------------- | |
122 | ||
123 | /** | |
124 | * Convert a decimal to hex | |
125 | * | |
126 | * @access private | |
127 | * @param string | |
128 | * @return string | |
129 | */ | |
130 | function _hex($str) | |
131 | { | |
132 | $str = dechex($str); | |
133 | ||
134 | if (strlen($str) == 7) | |
135 | { | |
136 | $str = '0'.$str; | |
137 | } | |
138 | ||
139 | return $str; | |
140 | } | |
141 | ||
142 | // -------------------------------------------------------------------- | |
143 | ||
144 | /** | |
145 | * Return result based on iteration | |
146 | * | |
147 | * @access private | |
148 | * @return string | |
149 | */ | |
150 | function _ft($t, $b, $c, $d) | |
151 | { | |
152 | if ($t < 20) | |
153 | return ($b & $c) | ((~$b) & $d); | |
154 | if ($t < 40) | |
155 | return $b ^ $c ^ $d; | |
156 | if ($t < 60) | |
157 | return ($b & $c) | ($b & $d) | ($c & $d); | |
158 | ||
159 | return $b ^ $c ^ $d; | |
160 | } | |
161 | ||
162 | // -------------------------------------------------------------------- | |
163 | ||
164 | /** | |
165 | * Determine the additive constant | |
166 | * | |
167 | * @access private | |
168 | * @return string | |
169 | */ | |
170 | function _kt($t) | |
171 | { | |
172 | if ($t < 20) | |
173 | { | |
174 | return 1518500249; | |
175 | } | |
176 | else if ($t < 40) | |
177 | { | |
178 | return 1859775393; | |
179 | } | |
180 | else if ($t < 60) | |
181 | { | |
182 | return -1894007588; | |
183 | } | |
184 | else | |
185 | { | |
186 | return -899497514; | |
187 | } | |
188 | } | |
189 | ||
190 | // -------------------------------------------------------------------- | |
191 | ||
192 | /** | |
193 | * Add integers, wrapping at 2^32 | |
194 | * | |
195 | * @access private | |
196 | * @return string | |
197 | */ | |
198 | function _safe_add($x, $y) | |
199 | { | |
200 | $lsw = ($x & 0xFFFF) + ($y & 0xFFFF); | |
201 | $msw = ($x >> 16) + ($y >> 16) + ($lsw >> 16); | |
202 | ||
203 | return ($msw << 16) | ($lsw & 0xFFFF); | |
204 | } | |
205 | ||
206 | // -------------------------------------------------------------------- | |
207 | ||
208 | /** | |
209 | * Bitwise rotate a 32-bit number | |
210 | * | |
211 | * @access private | |
212 | * @return integer | |
213 | */ | |
214 | function _rol($num, $cnt) | |
215 | { | |
216 | return ($num << $cnt) | $this->_zero_fill($num, 32 - $cnt); | |
217 | } | |
218 | ||
219 | // -------------------------------------------------------------------- | |
220 | ||
221 | /** | |
222 | * Pad string with zero | |
223 | * | |
224 | * @access private | |
225 | * @return string | |
226 | */ | |
227 | function _zero_fill($a, $b) | |
228 | { | |
229 | $bin = decbin($a); | |
230 | ||
231 | if (strlen($bin) < $b) | |
232 | { | |
233 | $bin = 0; | |
234 | } | |
235 | else | |
236 | { | |
237 | $bin = substr($bin, 0, strlen($bin) - $b); | |
238 | } | |
239 | ||
240 | for ($i=0; $i < $b; $i++) | |
241 | { | |
242 | $bin = "0".$bin; | |
243 | } | |
244 | ||
245 | return bindec($bin); | |
246 | } | |
247 | } | |
248 | // END CI_SHA | |
249 | ||
250 | /* End of file Sha1.php */ | |
251 | /* Location: ./system/libraries/Sha1.php */ |