diff options
Diffstat (limited to 'app/Library/password.php')
| -rw-r--r-- | app/Library/password.php | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/app/Library/password.php b/app/Library/password.php new file mode 100644 index 00000000..c6e84cbd --- /dev/null +++ b/app/Library/password.php @@ -0,0 +1,227 @@ +<?php +/** + * A Compatibility library with PHP 5.5's simplified password hashing API. + * + * @author Anthony Ferrara <ircmaxell@php.net> + * @license http://www.opensource.org/licenses/mit-license.html MIT License + * @copyright 2012 The Authors + */ + +if (!defined('PASSWORD_BCRYPT')) { + + define('PASSWORD_BCRYPT', 1); + define('PASSWORD_DEFAULT', PASSWORD_BCRYPT); + + if (version_compare(PHP_VERSION, '5.3.7', '<')) { + + define('PASSWORD_PREFIX', '$2a$'); + } + else { + + define('PASSWORD_PREFIX', '$2y$'); + } + + /** + * Hash the password using the specified algorithm + * + * @param string $password The password to hash + * @param int $algo The algorithm to use (Defined by PASSWORD_* constants) + * @param array $options The options for the algorithm to use + * + * @return string|false The hashed password, or false on error. + */ + function password_hash($password, $algo, array $options = array()) { + if (!function_exists('crypt')) { + trigger_error("Crypt must be loaded for password_hash to function", E_USER_WARNING); + return null; + } + if (!is_string($password)) { + trigger_error("password_hash(): Password must be a string", E_USER_WARNING); + return null; + } + if (!is_int($algo)) { + trigger_error("password_hash() expects parameter 2 to be long, " . gettype($algo) . " given", E_USER_WARNING); + return null; + } + switch ($algo) { + case PASSWORD_BCRYPT: + // Note that this is a C constant, but not exposed to PHP, so we don't define it here. + $cost = 10; + if (isset($options['cost'])) { + $cost = $options['cost']; + if ($cost < 4 || $cost > 31) { + trigger_error(sprintf("password_hash(): Invalid bcrypt cost parameter specified: %d", $cost), E_USER_WARNING); + return null; + } + } + $required_salt_len = 22; + $hash_format = sprintf("%s%02d$", PASSWORD_PREFIX, $cost); + break; + default: + trigger_error(sprintf("password_hash(): Unknown password hashing algorithm: %s", $algo), E_USER_WARNING); + return null; + } + if (isset($options['salt'])) { + switch (gettype($options['salt'])) { + case 'NULL': + case 'boolean': + case 'integer': + case 'double': + case 'string': + $salt = (string) $options['salt']; + break; + case 'object': + if (method_exists($options['salt'], '__tostring')) { + $salt = (string) $options['salt']; + break; + } + case 'array': + case 'resource': + default: + trigger_error('password_hash(): Non-string salt parameter supplied', E_USER_WARNING); + return null; + } + if (strlen($salt) < $required_salt_len) { + trigger_error(sprintf("password_hash(): Provided salt is too short: %d expecting %d", strlen($salt), $required_salt_len), E_USER_WARNING); + return null; + } elseif (0 == preg_match('#^[a-zA-Z0-9./]+$#D', $salt)) { + $salt = str_replace('+', '.', base64_encode($salt)); + } + } else { + $buffer = ''; + $raw_length = (int) ($required_salt_len * 3 / 4 + 1); + $buffer_valid = false; + if (function_exists('mcrypt_create_iv') && !defined('PHALANGER')) { + $buffer = mcrypt_create_iv($raw_length, MCRYPT_DEV_URANDOM); + if ($buffer) { + $buffer_valid = true; + } + } + if (!$buffer_valid && function_exists('openssl_random_pseudo_bytes')) { + $buffer = openssl_random_pseudo_bytes($raw_length); + if ($buffer) { + $buffer_valid = true; + } + } + if (!$buffer_valid && is_readable('/dev/urandom')) { + $f = fopen('/dev/urandom', 'r'); + $read = strlen($buffer); + while ($read < $raw_length) { + $buffer .= fread($f, $raw_length - $read); + $read = strlen($buffer); + } + fclose($f); + if ($read >= $raw_length) { + $buffer_valid = true; + } + } + if (!$buffer_valid || strlen($buffer) < $raw_length) { + $bl = strlen($buffer); + for ($i = 0; $i < $raw_length; $i++) { + if ($i < $bl) { + $buffer[$i] = $buffer[$i] ^ chr(mt_rand(0, 255)); + } else { + $buffer .= chr(mt_rand(0, 255)); + } + } + } + $salt = str_replace('+', '.', base64_encode($buffer)); + + } + $salt = substr($salt, 0, $required_salt_len); + + $hash = $hash_format . $salt; + + $ret = crypt($password, $hash); + + if (!is_string($ret) || strlen($ret) <= 13) { + return false; + } + + return $ret; + } + + /** + * Get information about the password hash. Returns an array of the information + * that was used to generate the password hash. + * + * array( + * 'algo' => 1, + * 'algoName' => 'bcrypt', + * 'options' => array( + * 'cost' => 10, + * ), + * ) + * + * @param string $hash The password hash to extract info from + * + * @return array The array of information about the hash. + */ + function password_get_info($hash) { + $return = array( + 'algo' => 0, + 'algoName' => 'unknown', + 'options' => array(), + ); + if (substr($hash, 0, 4) == PASSWORD_PREFIX && strlen($hash) == 60) { + $return['algo'] = PASSWORD_BCRYPT; + $return['algoName'] = 'bcrypt'; + list($cost) = sscanf($hash, PASSWORD_PREFIX."%d$"); + $return['options']['cost'] = $cost; + } + return $return; + } + + /** + * Determine if the password hash needs to be rehashed according to the options provided + * + * If the answer is true, after validating the password using password_verify, rehash it. + * + * @param string $hash The hash to test + * @param int $algo The algorithm used for new password hashes + * @param array $options The options array passed to password_hash + * + * @return boolean True if the password needs to be rehashed. + */ + function password_needs_rehash($hash, $algo, array $options = array()) { + $info = password_get_info($hash); + if ($info['algo'] != $algo) { + return true; + } + switch ($algo) { + case PASSWORD_BCRYPT: + $cost = isset($options['cost']) ? $options['cost'] : 10; + if ($cost != $info['options']['cost']) { + return true; + } + break; + } + return false; + } + + /** + * Verify a password against a hash using a timing attack resistant approach + * + * @param string $password The password to verify + * @param string $hash The hash to verify against + * + * @return boolean If the password matches the hash + */ + function password_verify($password, $hash) { + if (!function_exists('crypt')) { + trigger_error("Crypt must be loaded for password_verify to function", E_USER_WARNING); + return false; + } + $ret = crypt($password, $hash); + if (!is_string($ret) || strlen($ret) != strlen($hash) || strlen($ret) <= 13) { + return false; + } + + $status = 0; + for ($i = 0; $i < strlen($ret); $i++) { + $status |= (ord($ret[$i]) ^ ord($hash[$i])); + } + + return $status === 0; + } +} |