228 lines
8.0 KiB
PHP
228 lines
8.0 KiB
PHP
<?php
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/**
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* A Compatibility library with PHP 5.5's simplified password hashing API.
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*
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* @author Anthony Ferrara <ircmaxell@php.net>
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* @license http://www.opensource.org/licenses/mit-license.html MIT License
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* @copyright 2012 The Authors
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*/
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if (!defined('PASSWORD_BCRYPT')) {
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define('PASSWORD_BCRYPT', 1);
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define('PASSWORD_DEFAULT', PASSWORD_BCRYPT);
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if (version_compare(PHP_VERSION, '5.3.7', '<')) {
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define('PASSWORD_PREFIX', '$2a$');
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} else {
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define('PASSWORD_PREFIX', '$2y$');
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}
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/**
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* Hash the password using the specified algorithm
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*
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* @param string $password The password to hash
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* @param int $algo The algorithm to use (Defined by PASSWORD_* constants)
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* @param array $options The options for the algorithm to use
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*
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* @return string|false The hashed password, or false on error.
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*/
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function password_hash($password, $algo, array $options = array())
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{
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if (!function_exists('crypt')) {
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trigger_error("Crypt must be loaded for password_hash to function", E_USER_WARNING);
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return null;
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}
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if (!is_string($password)) {
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trigger_error("password_hash(): Password must be a string", E_USER_WARNING);
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return null;
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}
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if (!is_int($algo)) {
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trigger_error("password_hash() expects parameter 2 to be long, " . gettype($algo) . " given", E_USER_WARNING);
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return null;
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}
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switch ($algo) {
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case PASSWORD_BCRYPT:
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// Note that this is a C constant, but not exposed to PHP, so we don't define it here.
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$cost = 10;
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if (isset($options['cost'])) {
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$cost = $options['cost'];
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if ($cost < 4 || $cost > 31) {
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trigger_error(sprintf("password_hash(): Invalid bcrypt cost parameter specified: %d", $cost), E_USER_WARNING);
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return null;
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}
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}
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$required_salt_len = 22;
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$hash_format = sprintf("%s%02d$", PASSWORD_PREFIX, $cost);
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break;
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default:
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trigger_error(sprintf("password_hash(): Unknown password hashing algorithm: %s", $algo), E_USER_WARNING);
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return null;
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}
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if (isset($options['salt'])) {
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switch (gettype($options['salt'])) {
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case 'NULL':
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case 'boolean':
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case 'integer':
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case 'double':
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case 'string':
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$salt = (string) $options['salt'];
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break;
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case 'object':
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if (method_exists($options['salt'], '__tostring')) {
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$salt = (string) $options['salt'];
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break;
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}
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case 'array':
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case 'resource':
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default:
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trigger_error('password_hash(): Non-string salt parameter supplied', E_USER_WARNING);
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return null;
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}
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if (strlen($salt) < $required_salt_len) {
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trigger_error(sprintf("password_hash(): Provided salt is too short: %d expecting %d", strlen($salt), $required_salt_len), E_USER_WARNING);
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return null;
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} elseif (0 == preg_match('#^[a-zA-Z0-9./]+$#D', $salt)) {
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$salt = str_replace('+', '.', base64_encode($salt));
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}
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} else {
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$buffer = '';
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$raw_length = (int) ($required_salt_len * 3 / 4 + 1);
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$buffer_valid = false;
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if (function_exists('mcrypt_create_iv') && !defined('PHALANGER')) {
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$buffer = mcrypt_create_iv($raw_length, MCRYPT_DEV_URANDOM);
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if ($buffer) {
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$buffer_valid = true;
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}
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}
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if (!$buffer_valid && function_exists('openssl_random_pseudo_bytes')) {
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$buffer = openssl_random_pseudo_bytes($raw_length);
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if ($buffer) {
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$buffer_valid = true;
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}
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}
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if (!$buffer_valid && is_readable('/dev/urandom')) {
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$f = fopen('/dev/urandom', 'r');
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$read = strlen($buffer);
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while ($read < $raw_length) {
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$buffer .= fread($f, $raw_length - $read);
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$read = strlen($buffer);
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}
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fclose($f);
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if ($read >= $raw_length) {
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$buffer_valid = true;
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}
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}
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if (!$buffer_valid || strlen($buffer) < $raw_length) {
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$bl = strlen($buffer);
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for ($i = 0; $i < $raw_length; ++$i) {
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if ($i < $bl) {
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$buffer[$i] ^= chr(mt_rand(0, 255));
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} else {
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$buffer .= chr(mt_rand(0, 255));
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}
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}
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}
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$salt = str_replace('+', '.', base64_encode($buffer));
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}
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$salt = substr($salt, 0, $required_salt_len);
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$hash = $hash_format . $salt;
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$ret = crypt($password, $hash);
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if (!is_string($ret) || strlen($ret) <= 13) {
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return false;
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}
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return $ret;
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}
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/**
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* Get information about the password hash. Returns an array of the information
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* that was used to generate the password hash.
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*
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* array(
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* 'algo' => 1,
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* 'algoName' => 'bcrypt',
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* 'options' => array(
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* 'cost' => 10,
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* ),
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* )
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*
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* @param string $hash The password hash to extract info from
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*
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* @return array The array of information about the hash.
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*/
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function password_get_info($hash)
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{
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$return = array(
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'algo' => 0,
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'algoName' => 'unknown',
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'options' => array(),
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);
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if (substr($hash, 0, 4) == PASSWORD_PREFIX && strlen($hash) == 60) {
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$return['algo'] = PASSWORD_BCRYPT;
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$return['algoName'] = 'bcrypt';
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list($cost) = sscanf($hash, PASSWORD_PREFIX."%d$");
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$return['options']['cost'] = $cost;
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}
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return $return;
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}
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/**
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* Determine if the password hash needs to be rehashed according to the options provided
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*
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* If the answer is true, after validating the password using password_verify, rehash it.
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*
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* @param string $hash The hash to test
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* @param int $algo The algorithm used for new password hashes
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* @param array $options The options array passed to password_hash
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*
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* @return boolean True if the password needs to be rehashed.
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*/
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function password_needs_rehash($hash, $algo, array $options = array())
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{
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$info = password_get_info($hash);
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if ($info['algo'] != $algo) {
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return true;
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}
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switch ($algo) {
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case PASSWORD_BCRYPT:
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$cost = isset($options['cost']) ? $options['cost'] : 10;
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if ($cost != $info['options']['cost']) {
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return true;
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}
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break;
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}
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return false;
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}
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/**
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* Verify a password against a hash using a timing attack resistant approach
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*
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* @param string $password The password to verify
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* @param string $hash The hash to verify against
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*
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* @return boolean If the password matches the hash
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*/
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function password_verify($password, $hash)
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{
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if (!function_exists('crypt')) {
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trigger_error("Crypt must be loaded for password_verify to function", E_USER_WARNING);
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return false;
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}
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$ret = crypt($password, $hash);
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$len = strlen($ret);
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if (!is_string($ret) || $len != strlen($hash) || $len <= 13) {
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return false;
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}
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$status = 0;
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for ($i = 0; $i < $len; ++$i) {
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$status |= (ord($ret[$i]) ^ ord($hash[$i]));
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}
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return $status === 0;
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}
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}
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