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Generate a random key to be used based on a specified hashing algorithm.
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| <?php | |
| /** | |
| * Generate a random key | |
| * | |
| * Generate a random key based on the specified hashing algorithm and given length. | |
| * The algorithm defaults to "sha256" and the length defaults to 1024. | |
| * See PHP's hash_algos() function for a list of supported hashing algorithms. | |
| * | |
| * @param string $algo The hashing algorithm to use | |
| * @param int $length Length of desired string of bytes to create the hash | |
| * @return string Random hash | |
| * @access public | |
| */ | |
| function generate_random_key($algo = 'sha256', $length = 1024) | |
| { | |
| $key = ''; | |
| // Check if the openssl_random_pseudo_bytes() function exists | |
| if ( function_exists('openssl_random_pseudo_bytes') ) | |
| { // It does exist so let's use it to generate a string of random bytes to hash | |
| $data = openssl_random_pseudo_bytes($length, $cstrong) . mt_rand() . microtime(); | |
| $key = hash($algo, $data); | |
| } else | |
| { // It doesn't exist, but have no fear... We will attempt to read from /dev/urandom instead | |
| // Even if the file_get_contents() function returns FALSE, a hash will still be generated based on | |
| // a random number from mt_rand() and the microtime() | |
| $data = mt_rand() . microtime() . file_get_contents('/dev/urandom', $length) . mt_rand() . microtime(); | |
| $key = hash($algo, $data); | |
| } | |
| return $key; | |
| } |
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