1
|
|
|
<?php |
2
|
|
|
|
3
|
|
|
/* |
4
|
|
|
* The RandomLib library for securely generating random numbers and strings in PHP |
5
|
|
|
* |
6
|
|
|
* @author Anthony Ferrara <[email protected]> |
7
|
|
|
* @copyright 2011 The Authors |
8
|
|
|
* @license http://www.opensource.org/licenses/mit-license.html MIT License |
9
|
|
|
* @version Build @@version@@ |
10
|
|
|
*/ |
11
|
|
|
|
12
|
|
|
/** |
13
|
|
|
* An abstract mixer to implement a common mixing strategy |
14
|
|
|
* |
15
|
|
|
* PHP version 5.3 |
16
|
|
|
* |
17
|
|
|
* @category PHPSecurityLib |
18
|
|
|
* @package Random |
19
|
|
|
* |
20
|
|
|
* @author Anthony Ferrara <[email protected]> |
21
|
|
|
* @copyright 2011 The Authors |
22
|
|
|
* @license http://www.opensource.org/licenses/mit-license.html MIT License |
23
|
|
|
* |
24
|
|
|
* @version Build @@version@@ |
25
|
|
|
*/ |
26
|
|
|
namespace RandomLib; |
27
|
|
|
|
28
|
|
|
use SecurityLib\Util; |
29
|
|
|
|
30
|
|
|
/** |
31
|
|
|
* An abstract mixer to implement a common mixing strategy |
32
|
|
|
* |
33
|
|
|
* @see http://tools.ietf.org/html/rfc4086#section-5.2 |
34
|
|
|
* |
35
|
|
|
* @category PHPSecurityLib |
36
|
|
|
* @package Random |
37
|
|
|
* |
38
|
|
|
* @author Anthony Ferrara <[email protected]> |
39
|
|
|
*/ |
40
|
|
|
abstract class AbstractMixer implements \RandomLib\Mixer |
41
|
|
|
{ |
42
|
|
|
|
43
|
|
|
/** |
44
|
|
|
* Get the block size (the size of the individual blocks used for the mixing) |
45
|
|
|
* |
46
|
|
|
* @return int The block size |
47
|
|
|
*/ |
48
|
|
|
abstract protected function getPartSize(); |
49
|
|
|
|
50
|
|
|
/** |
51
|
|
|
* Mix 2 parts together using one method |
52
|
|
|
* |
53
|
|
|
* @param string $part1 The first part to mix |
54
|
|
|
* @param string $part2 The second part to mix |
55
|
|
|
* |
56
|
|
|
* @return string The mixed data |
57
|
|
|
*/ |
58
|
|
|
abstract protected function mixParts1($part1, $part2); |
59
|
|
|
|
60
|
|
|
/** |
61
|
|
|
* Mix 2 parts together using another different method |
62
|
|
|
* |
63
|
|
|
* @param string $part1 The first part to mix |
64
|
|
|
* @param string $part2 The second part to mix |
65
|
|
|
* |
66
|
|
|
* @return string The mixed data |
67
|
|
|
*/ |
68
|
|
|
abstract protected function mixParts2($part1, $part2); |
69
|
|
|
|
70
|
|
|
/** |
71
|
|
|
* Mix the provided array of strings into a single output of the same size |
72
|
|
|
* |
73
|
|
|
* All elements of the array should be the same size. |
74
|
|
|
* |
75
|
|
|
* @param array $parts The parts to be mixed |
76
|
|
|
* |
77
|
|
|
* @return string The mixed result |
78
|
|
|
*/ |
79
|
|
|
public function mix(array $parts) |
80
|
|
|
{ |
81
|
|
|
if (empty($parts)) { |
82
|
|
|
return ''; |
83
|
|
|
} |
84
|
|
|
$len = Util::safeStrlen($parts[0]); |
85
|
|
|
$parts = $this->normalizeParts($parts); |
86
|
|
|
$stringSize = count($parts[0]); |
87
|
|
|
$partsSize = count($parts); |
88
|
|
|
$result = ''; |
89
|
|
|
$offset = 0; |
90
|
|
|
for ($i = 0; $i < $stringSize; $i++) { |
91
|
|
|
$stub = $parts[$offset][$i]; |
92
|
|
|
for ($j = 1; $j < $partsSize; $j++) { |
93
|
|
|
$newKey = $parts[($j + $offset) % $partsSize][$i]; |
94
|
|
|
//Alternately mix the output for each source |
95
|
|
|
if ($j % 2 == 1) { |
96
|
|
|
$stub ^= $this->mixParts1($stub, $newKey); |
97
|
|
|
} else { |
98
|
|
|
$stub ^= $this->mixParts2($stub, $newKey); |
99
|
|
|
} |
100
|
|
|
} |
101
|
|
|
$result .= $stub; |
102
|
|
|
$offset = ($offset + 1) % $partsSize; |
103
|
|
|
} |
104
|
|
|
|
105
|
|
|
return Util::safeSubstr($result, 0, $len); |
106
|
|
|
} |
107
|
|
|
|
108
|
|
|
/** |
109
|
|
|
* Normalize the part array and split it block part size. |
110
|
|
|
* |
111
|
|
|
* This will make all parts the same length and a multiple |
112
|
|
|
* of the part size |
113
|
|
|
* |
114
|
|
|
* @param array $parts The parts to normalize |
115
|
|
|
* |
116
|
|
|
* @return array The normalized and split parts |
117
|
|
|
*/ |
118
|
|
|
protected function normalizeParts(array $parts) |
119
|
|
|
{ |
120
|
|
|
$blockSize = $this->getPartSize(); |
121
|
|
|
$callback = function ($value) { |
122
|
|
|
return Util::safeStrlen($value); |
123
|
|
|
}; |
124
|
|
|
$maxSize = max(array_map($callback, $parts)); |
125
|
|
|
if ($maxSize % $blockSize != 0) { |
126
|
|
|
$maxSize += $blockSize - ($maxSize % $blockSize); |
127
|
|
|
} |
128
|
|
|
foreach ($parts as &$part) { |
129
|
|
|
$part = $this->str_pad($part, $maxSize, chr(0)); |
130
|
|
|
$part = str_split($part, $blockSize); |
131
|
|
|
} |
132
|
|
|
|
133
|
|
|
return $parts; |
134
|
|
|
} |
135
|
|
|
|
136
|
|
|
private function str_pad($string, $size, $character) |
|
|
|
|
137
|
|
|
{ |
138
|
|
|
$start = Util::safeStrlen($string); |
139
|
|
|
$inc = Util::safeStrlen($character); |
140
|
|
|
for ($i = $start; $i < $size; $i+= $inc) { |
141
|
|
|
$string = $string . $character; |
142
|
|
|
} |
143
|
|
|
|
144
|
|
|
return Util::safeSubstr($string, 0, $size); |
145
|
|
|
} |
146
|
|
|
|
147
|
|
|
private function str_split($string, $size) |
|
|
|
|
148
|
|
|
{ |
149
|
|
|
$blocks = array(); |
150
|
|
|
$length = Util::safeStrlen($string); |
151
|
|
|
$parts = ceil($length / $size); |
152
|
|
|
for ($i = 0; $i < $parts; $i++) { |
153
|
|
|
$blocks[] = Util::safeSubstr($string, $i * $length, $length); |
154
|
|
|
} |
155
|
|
|
|
156
|
|
|
return $blocks; |
157
|
|
|
} |
158
|
|
|
} |
159
|
|
|
|
This check looks for method names that are not written in camelCase.
In camelCase names are written without any punctuation, the start of each new word being marked by a capital letter. Thus the name database connection seeker becomes
databaseConnectionSeeker
.