PasswordHash

44class PasswordHash {45	var $itoa64;46	var $iteration_count_log2;47	var $portable_hashes;48	var $random_state;49 50	function __construct($iteration_count_log2, $portable_hashes)51	{52		$this->itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';53 54		if ($iteration_count_log2 < 4 || $iteration_count_log2 > 31) {55			$iteration_count_log2 = 8;56		}57		$this->iteration_count_log2 = $iteration_count_log2;58 59		$this->portable_hashes = $portable_hashes;60 61		$this->random_state = microtime();62		if (function_exists('getmypid')) {63			$this->random_state .= getmypid();64		}65	}66 67	function PasswordHash($iteration_count_log2, $portable_hashes)68	{69		self::__construct($iteration_count_log2, $portable_hashes);70	}71 72	function get_random_bytes($count)73	{74		$output = '';75		if (@is_readable('/dev/urandom') &&76		    ($fh = @fopen('/dev/urandom', 'rb'))) {77			$output = fread($fh, $count);78			fclose($fh);79		}80 81		if (strlen($output) < $count) {82			$output = '';83			for ($i = 0; $i < $count; $i += 16) {84				$this->random_state =85				    md5(microtime() . $this->random_state);86				$output .= md5($this->random_state, TRUE);87			}88			$output = substr($output, 0, $count);89		}90 91		return $output;92	}93 94	function encode64($input, $count)95	{96		$output = '';97		$i = 0;98		do {99			$value = ord($input[$i++]);100			$output .= $this->itoa64[$value & 0x3f];101			if ($i < $count) {102				$value |= ord($input[$i]) << 8;103			}104			$output .= $this->itoa64[($value >> 6) & 0x3f];105			if ($i++ >= $count) {106				break;107			}108			if ($i < $count) {109				$value |= ord($input[$i]) << 16;110			}111			$output .= $this->itoa64[($value >> 12) & 0x3f];112			if ($i++ >= $count) {113				break;114			}115			$output .= $this->itoa64[($value >> 18) & 0x3f];116		} while ($i < $count);117 118		return $output;119	}120 121	function gensalt_private($input)122	{123		$output = '$P$';