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14d4f286 S |
1 | <?php |
2 | /** | |
3 | * An implementation of the crypt library's SHA512 hash method | |
4 | * | |
5 | * PHP version 5.3 | |
6 | * | |
7 | * @category PHPCryptLib | |
8 | * @package Key | |
9 | * @subpackage Derivation | |
10 | * @author Anthony Ferrara <ircmaxell@ircmaxell.com> | |
11 | * @copyright 2011 The Authors | |
12 | * @license http://www.opensource.org/licenses/mit-license.html MIT License | |
13 | * @version Build @@version@@ | |
14 | */ | |
15 | ||
16 | namespace CryptLib\Key\Derivation\PBKDF; | |
17 | ||
18 | /** | |
19 | * An implementation of the crypt library's SHA512 hash method | |
20 | * | |
21 | * PHP version 5.3 | |
22 | * | |
23 | * @category PHPCryptLib | |
24 | * @package Key | |
25 | * @subpackage Derivation | |
26 | * @author Anthony Ferrara <ircmaxell@ircmaxell.com> | |
27 | */ | |
28 | class SHA256 | |
29 | extends \CryptLib\Key\Derivation\AbstractDerivation | |
30 | implements \CryptLib\Key\Derivation\PBKDF | |
31 | { | |
32 | ||
33 | /** | |
34 | * Derive a key from the supplied arguments | |
35 | * | |
36 | * @param string $password The password to derive from | |
37 | * @param string $salt The salt string to use | |
38 | * @param int $iterations The number of iterations to use | |
39 | * @param int $length The size of the string to generate | |
40 | * | |
41 | * @return string The derived key | |
42 | */ | |
43 | public function derive($password, $salt, $iterations, $length) { | |
44 | $salt = substr(str_pad($salt, 16, chr(0)), 0, 16); | |
45 | $salt = '$5$rounds='.$iterations.'$'.$salt; | |
46 | return crypt($password, $salt); | |
47 | } | |
48 | ||
49 | /** | |
50 | * Get the signature for this implementation | |
51 | * | |
52 | * This should include all information needed to build the same isntance | |
53 | * later. | |
54 | * | |
55 | * @return string The signature for this instance | |
56 | */ | |
57 | public function getSignature() { | |
58 | return 'sha256'; | |
59 | } | |
60 | ||
61 | } | |
62 |