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14d4f286 S |
1 | <?php |
2 | /** | |
3 | * The DES medium strength mixer class | |
4 | * | |
5 | * This class implements a mixer based upon the recommendations in RFC 4086 | |
6 | * section 5.2 | |
7 | * | |
8 | * PHP version 5.3 | |
9 | * | |
10 | * @see http://tools.ietf.org/html/rfc4086#section-5.2 | |
11 | * @category PHPCryptLib | |
12 | * @package Random | |
13 | * @subpackage Mixer | |
14 | * @author Anthony Ferrara <ircmaxell@ircmaxell.com> | |
15 | * @copyright 2011 The Authors | |
16 | * @license http://www.opensource.org/licenses/mit-license.html MIT License | |
17 | * @version Build @@version@@ | |
18 | */ | |
19 | ||
20 | namespace CryptLib\Random\Mixer; | |
21 | ||
22 | use \CryptLib\Cipher\Factory as CipherFactory; | |
23 | use \CryptLib\Core\Strength; | |
24 | ||
25 | /** | |
26 | * The DES medium strength mixer class | |
27 | * | |
28 | * This class implements a mixer based upon the recommendations in RFC 4086 | |
29 | * section 5.2 | |
30 | * | |
31 | * @see http://tools.ietf.org/html/rfc4086#section-5.2 | |
32 | * @category PHPCryptLib | |
33 | * @package Random | |
34 | * @subpackage Mixer | |
35 | * @author Anthony Ferrara <ircmaxell@ircmaxell.com> | |
36 | */ | |
37 | class DES extends \CryptLib\Random\AbstractMixer { | |
38 | ||
39 | /** | |
40 | * An instance of a DES symmetric encryption cipher | |
41 | * | |
42 | * @var Cipher The DES cipher instance | |
43 | */ | |
44 | protected $cipher = 'des'; | |
45 | ||
46 | /** | |
47 | * Return an instance of Strength indicating the strength of the source | |
48 | * | |
49 | * @return Strength An instance of one of the strength classes | |
50 | */ | |
51 | public static function getStrength() { | |
52 | return new Strength(Strength::MEDIUM); | |
53 | } | |
54 | ||
55 | /** | |
56 | * Test to see if the mixer is available | |
57 | * | |
58 | * @return boolean If the mixer is available on the system | |
59 | */ | |
60 | public static function test() { | |
61 | return true; | |
62 | } | |
63 | ||
64 | /** | |
65 | * Build a new instance of the DES mixing function | |
66 | * | |
67 | * @param Factory $factory The optional encryption factory to use | |
68 | * | |
69 | * @return void | |
70 | */ | |
71 | public function __construct(\CryptLib\Cipher\Factory $factory = null) { | |
72 | if (is_null($factory)) { | |
73 | $factory = new CipherFactory(); | |
74 | } | |
75 | $this->cipher = $factory->getBlockCipher($this->cipher); | |
76 | } | |
77 | ||
78 | /** | |
79 | * Get the block size (the size of the individual blocks used for the mixing) | |
80 | * | |
81 | * @return int The block size | |
82 | */ | |
83 | protected function getPartSize() { | |
84 | return $this->cipher->getBlockSize(); | |
85 | } | |
86 | ||
87 | /** | |
88 | * Mix 2 parts together using one method | |
89 | * | |
90 | * @param string $part1 The first part to mix | |
91 | * @param string $part2 The second part to mix | |
92 | * | |
93 | * @return string The mixed data | |
94 | */ | |
95 | protected function mixParts1($part1, $part2) { | |
96 | $this->cipher->setKey($part2); | |
97 | return $this->cipher->encryptBlock($part1); | |
98 | } | |
99 | ||
100 | /** | |
101 | * Mix 2 parts together using another different method | |
102 | * | |
103 | * @param string $part1 The first part to mix | |
104 | * @param string $part2 The second part to mix | |
105 | * | |
106 | * @return string The mixed data | |
107 | */ | |
108 | protected function mixParts2($part1, $part2) { | |
109 | $this->cipher->setKey($part1); | |
110 | return $this->cipher->decryptBlock($part2); | |
111 | } | |
112 | ||
113 | } |