Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame] | 1 | <?php |
Matthias Andreas Benkard | 7b2a3a1 | 2021-08-16 10:57:25 +0200 | [diff] [blame^] | 2 | |
Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame] | 3 | namespace RobThree\Auth\Providers\Rng; |
| 4 | |
| 5 | class HashRNGProvider implements IRNGProvider |
| 6 | { |
Matthias Andreas Benkard | 7b2a3a1 | 2021-08-16 10:57:25 +0200 | [diff] [blame^] | 7 | /** @var string */ |
Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame] | 8 | private $algorithm; |
Matthias Andreas Benkard | 7b2a3a1 | 2021-08-16 10:57:25 +0200 | [diff] [blame^] | 9 | |
| 10 | /** |
| 11 | * @param string $algorithm |
| 12 | */ |
| 13 | public function __construct($algorithm = 'sha256') |
| 14 | { |
Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame] | 15 | $algos = array_values(hash_algos()); |
Matthias Andreas Benkard | 7b2a3a1 | 2021-08-16 10:57:25 +0200 | [diff] [blame^] | 16 | if (!in_array($algorithm, $algos, true)) { |
| 17 | throw new RNGException('Unsupported algorithm specified'); |
| 18 | } |
Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame] | 19 | $this->algorithm = $algorithm; |
| 20 | } |
Matthias Andreas Benkard | 7b2a3a1 | 2021-08-16 10:57:25 +0200 | [diff] [blame^] | 21 | |
| 22 | /** |
| 23 | * {@inheritdoc} |
| 24 | */ |
| 25 | public function getRandomBytes($bytecount) |
| 26 | { |
Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame] | 27 | $result = ''; |
| 28 | $hash = mt_rand(); |
| 29 | for ($i = 0; $i < $bytecount; $i++) { |
Matthias Andreas Benkard | 7b2a3a1 | 2021-08-16 10:57:25 +0200 | [diff] [blame^] | 30 | $hash = hash($this->algorithm, $hash . mt_rand(), true); |
| 31 | $result .= $hash[mt_rand(0, strlen($hash) - 1)]; |
Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame] | 32 | } |
| 33 | return $result; |
| 34 | } |
Matthias Andreas Benkard | 7b2a3a1 | 2021-08-16 10:57:25 +0200 | [diff] [blame^] | 35 | |
| 36 | /** |
| 37 | * {@inheritdoc} |
| 38 | */ |
| 39 | public function isCryptographicallySecure() |
| 40 | { |
Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame] | 41 | return false; |
| 42 | } |
| 43 | } |