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
|
<?php
/**
* The Cipher_rc2:: class implements the Cipher interface enryption data
* using the RC2 algorithm as described in RFC2268.
*
* Based on the notes by Peter Gutmann <pgut01@cs.auckland.ac.nz>
* http://www.mirrors.wiretapped.net/security/cryptography/
* algorithms/rc2/comments/gutman-960211
*
* $Horde: horde/lib/Cipher/rc2.php,v 1.1.2.3 2003/01/03 13:23:24 jan Exp $
*
* Copyright 2002-2003 Mike Cochrane <mike@graftonhall.co.nz>
*
* See the enclosed file COPYING for license information (LGPL). If you
* did not receive this file, see http://www.fsf.org/copyleft/lgpl.html.
*
* @author Mike Cochrane <mike@graftonhall.co.nz>
* @version $Revision: 1.1.2.3 $
* @since Horde 2.2
* @package horde.cipher
*/
class Horde_Cipher_rc2 extends Horde_Cipher {
/* Permutations array */
var $_perm = array(
0xD9, 0x78, 0xF9, 0xC4, 0x19, 0xDD, 0xB5, 0xED,
0x28, 0xE9, 0xFD, 0x79, 0x4A, 0xA0, 0xD8, 0x9D,
0xC6, 0x7E, 0x37, 0x83, 0x2B, 0x76, 0x53, 0x8E,
0x62, 0x4C, 0x64, 0x88, 0x44, 0x8B, 0xFB, 0xA2,
0x17, 0x9A, 0x59, 0xF5, 0x87, 0xB3, 0x4F, 0x13,
0x61, 0x45, 0x6D, 0x8D, 0x09, 0x81, 0x7D, 0x32,
0xBD, 0x8F, 0x40, 0xEB, 0x86, 0xB7, 0x7B, 0x0B,
0xF0, 0x95, 0x21, 0x22, 0x5C, 0x6B, 0x4E, 0x82,
0x54, 0xD6, 0x65, 0x93, 0xCE, 0x60, 0xB2, 0x1C,
0x73, 0x56, 0xC0, 0x14, 0xA7, 0x8C, 0xF1, 0xDC,
0x12, 0x75, 0xCA, 0x1F, 0x3B, 0xBE, 0xE4, 0xD1,
0x42, 0x3D, 0xD4, 0x30, 0xA3, 0x3C, 0xB6, 0x26,
0x6F, 0xBF, 0x0E, 0xDA, 0x46, 0x69, 0x07, 0x57,
0x27, 0xF2, 0x1D, 0x9B, 0xBC, 0x94, 0x43, 0x03,
0xF8, 0x11, 0xC7, 0xF6, 0x90, 0xEF, 0x3E, 0xE7,
0x06, 0xC3, 0xD5, 0x2F, 0xC8, 0x66, 0x1E, 0xD7,
0x08, 0xE8, 0xEA, 0xDE, 0x80, 0x52, 0xEE, 0xF7,
0x84, 0xAA, 0x72, 0xAC, 0x35, 0x4D, 0x6A, 0x2A,
0x96, 0x1A, 0xD2, 0x71, 0x5A, 0x15, 0x49, 0x74,
0x4B, 0x9F, 0xD0, 0x5E, 0x04, 0x18, 0xA4, 0xEC,
0xC2, 0xE0, 0x41, 0x6E, 0x0F, 0x51, 0xCB, 0xCC,
0x24, 0x91, 0xAF, 0x50, 0xA1, 0xF4, 0x70, 0x39,
0x99, 0x7C, 0x3A, 0x85, 0x23, 0xB8, 0xB4, 0x7A,
0xFC, 0x02, 0x36, 0x5B, 0x25, 0x55, 0x97, 0x31,
0x2D, 0x5D, 0xFA, 0x98, 0xE3, 0x8A, 0x92, 0xAE,
0x05, 0xDF, 0x29, 0x10, 0x67, 0x6C, 0xBA, 0xC9,
0xD3, 0x00, 0xE6, 0xCF, 0xE1, 0x9E, 0xA8, 0x2C,
0x63, 0x16, 0x01, 0x3F, 0x58, 0xE2, 0x89, 0xA9,
0x0D, 0x38, 0x34, 0x1B, 0xAB, 0x33, 0xFF, 0xB0,
0xBB, 0x48, 0x0C, 0x5F, 0xB9, 0xB1, 0xCD, 0x2E,
0xC5, 0xF3, 0xDB, 0x47, 0xE5, 0xA5, 0x9C, 0x77,
0x0A, 0xA6, 0x20, 0x68, 0xFE, 0x7F, 0xC1, 0xAD
);
/* Array to hold the key shecdule */
var $_keySchedule = array();
/* Constructor */
function Cipher_rc2($params = null)
{
}
/**
* Set the key to be used for en/decryption
*
* @param String $key The key to use
*/
function setKey($key)
{
$key = array_values(unpack('C*', $key));
$bits = 1024;
/* Expand input key to 128 bytes */
$len = count($key);
$last = $key[$len - 1];
for ($i = $len; $i < 128; $i++) {
$last = $this->_perm[($key[$i - $len] + $last) & 0xFF];
$key[$i] = $last;
}
/* Phase 2 - reduce effective key size to "bits" */
if ($len != 8) {
$len = $len * 8;
}
$key[128 - $len] = $this->_perm[$key[128 - $len] & 0xFF];
for ($i = 127 - $len; $i >= 0; $i--) {
$key[$i] = $this->_perm[$key[$i + $len] ^ $key[$i + 1]];
}
/* Phase 3 - convert to 16 bit values */
for ($i = 63; $i >= 0; $i--) {
$this->_keySchedule[$i] = ($key[$i * 2 + 1] << 8 | $key[$i * 2]) & 0xFFFF;
}
}
/**
* Return the size of the blocks that this cipher needs
*
* @return Integer The number of characters per block
*/
function getBlockSize()
{
return 8;
}
/**
* Encrypt a block on data.
*
* @param String $block The data to encrypt
* @param optional String $key The key to use
*
* @return String the encrypted output
*/
function encryptBlock($block, $key = null)
{
if (!is_null($key)) {
$this->setKey($key);
}
$plain = unpack('v*', $block);
//var_dump($plain);
for ($i = 0; $i < 16; $i++) {
$plain[1] += ($plain[2] & ~$plain[4]) + ($plain[3] & $plain[4]) + $this->_keySchedule[4 * $i + 0];
// $plain[1] = (($plain[1] << 1) + (($plain[1] >> 15) & 0x1));
$bin = str_pad(decbin(0xFFFF & $plain[1]), 32, '0', STR_PAD_LEFT);
$plain[1] = bindec($bin . substr($bin, 16, 1));
$plain[2] += ($plain[3] & ~$plain[1]) + ($plain[4] & $plain[1]) + $this->_keySchedule[4 * $i + 1];
// $plain[2] = ($plain[2] << 2) + ($plain[2] >> 14 & 0x3);
$bin = str_pad(decbin(0xFFFF & $plain[2]), 32, '0', STR_PAD_LEFT);
$plain[2] = bindec($bin . substr($bin, 16, 2));
$plain[3] += ($plain[4] & ~$plain[2]) + ($plain[1] & $plain[2]) + $this->_keySchedule[4 * $i + 2];
// $plain[3] = ($plain[3] << 3) + ($plain[3] >> 13 & 0x7);
$bin = str_pad(decbin(0xFFFF & $plain[3]), 16, '0', STR_PAD_LEFT);
// var_dump($bin);
// var_dump(substr($bin, 3) . substr($bin, 0, 3));
$plain[3] = bindec($bin . substr($bin, 0, 3));
$plain[4] += ($plain[1] & ~$plain[3]) + ($plain[2] & $plain[3]) + $this->_keySchedule[4 * $i + 3];
// $plain[4] = ($plain[4] << 5) + ($plain[4] >> 11 & 0x1F);
$bin = str_pad(decbin(0xFFFF & $plain[4]), 16, '0', STR_PAD_LEFT);
$plain[4] = bindec($bin . substr($bin, 0, 5));
if ($i == 4 || $i == 10) {
$plain[1] += $this->_keySchedule[$plain[4] & 0x3F];
$plain[2] += $this->_keySchedule[$plain[1] & 0x3F];
$plain[3] += $this->_keySchedule[$plain[2] & 0x3F];
$plain[4] += $this->_keySchedule[$plain[3] & 0x3F];
}
// echo "Round $i\n";
//var_dump($plain);
}
$encrypted = pack("s*", $plain[1], $plain[2], $plain[3], $plain[4]);
//var_dump(unpack("c*", $encrypted));
return $encrypted;
}
/**
* Decrypt a block on data.
*
* @param String $block The data to decrypt
* @param optional String $key The key to use
*
* @return String the decrypted output
*/
function decryptBlock($block, $key = null)
{
if (!is_null($key)) {
$this->setKey($key);
}
$cipher = unpack('v*', $block);
for ($i = 15; $i >= 0; $i--) {
$cipher[4] &= 0xFFFF;
$cipher[4] = ($cipher[4] << 11) + ($cipher[4] >> 5);
$cipher[4] -= ($cipher[1] & ~$cipher[3]) + ($cipher[2] & $cipher[3]) + $this->_keySchedule[4 * $i + 3];
$cipher[3] &= 0xFFFF;
$cipher[3] = ($cipher[3] << 13) + ($cipher[3] >> 3);
$cipher[3] -= ($cipher[4] & ~$cipher[2]) + ($cipher[1] & $cipher[2]) + $this->_keySchedule[4 * $i + 2];
$cipher[2] &= 0xFFFF;
$cipher[2] = ($cipher[2] << 14) + ($cipher[2] >> 2);
$cipher[2] -= ($cipher[3] & ~$cipher[1]) + ($cipher[4] & $cipher[1]) + $this->_keySchedule[4 * $i + 1];
$cipher[1] &= 0xFFFF;
$cipher[1] = ($cipher[1] << 15) + ($cipher[1] >> 1);
$cipher[1] -= ($cipher[2] & ~$cipher[4]) + ($cipher[3] & $cipher[4]) + $this->_keySchedule[4 * $i + 0];
if ($i == 5 || $i == 11) {
$cipher[4] -= $this->_keySchedule[$cipher[3] & 0x3F];
$cipher[3] -= $this->_keySchedule[$cipher[2] & 0x3F];
$cipher[2] -= $this->_keySchedule[$cipher[1] & 0x3F];
$cipher[1] -= $this->_keySchedule[$cipher[4] & 0x3F];
}
}
$decrypted = pack("v*", $cipher[1], $cipher[2], $cipher[3], $cipher[4]);
return $decrypted;
}
}
|
