--- /dev/null
+<?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
+ */
+
+namespace {
+
+ if (!defined('PASSWORD_BCRYPT')) {
+ /**
+ * PHPUnit Process isolation caches constants, but not function declarations.
+ * So we need to check if the constants are defined separately from
+ * the functions to enable supporting process isolation in userland
+ * code.
+ */
+ define('PASSWORD_BCRYPT', 1);
+ define('PASSWORD_DEFAULT', PASSWORD_BCRYPT);
+ define('PASSWORD_BCRYPT_DEFAULT_COST', 10);
+ }
+
+ if (!function_exists('password_hash')) {
+
+ /**
+ * 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 $options = array()) {
+ if (!function_exists('crypt')) {
+ trigger_error("Crypt must be loaded for password_hash to function", E_USER_WARNING);
+ return null;
+ }
+ if (is_null($password) || is_int($password)) {
+ $password = (string) $password;
+ }
+ if (!is_string($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;
+ }
+ $resultLength = 0;
+ switch ($algo) {
+ case PASSWORD_BCRYPT:
+ $cost = PASSWORD_BCRYPT_DEFAULT_COST;
+ if (isset($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;
+ }
+ }
+ // The length of salt to generate
+ $raw_salt_len = 16;
+ // The length required in the final serialization
+ $required_salt_len = 22;
+ $hash_format = sprintf("$2y$%02d$", $cost);
+ // The expected length of the final crypt() output
+ $resultLength = 60;
+ break;
+ default:
+ trigger_error(sprintf("password_hash(): Unknown password hashing algorithm: %s", $algo), E_USER_WARNING);
+ return null;
+ }
+ $salt_requires_encoding = false;
+ if (isset($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) $options['salt'];
+ break;
+ }
+ case 'array':
+ case 'resource':
+ default:
+ trigger_error('password_hash(): Non-string salt parameter supplied', E_USER_WARNING);
+ return null;
+ }
+ if (PasswordCompat\binary\_strlen($salt) < $required_salt_len) {
+ trigger_error(sprintf("password_hash(): Provided salt is too short: %d expecting %d", PasswordCompat\binary\_strlen($salt), $required_salt_len), E_USER_WARNING);
+ return null;
+ } elseif (0 == preg_match('#^[a-zA-Z0-9./]+$#D', $salt)) {
+ $salt_requires_encoding = true;
+ }
+ } else {
+ $buffer = '';
+ $buffer_valid = false;
+ if (function_exists('mcrypt_create_iv') && !defined('PHALANGER')) {
+ $buffer = mcrypt_create_iv($raw_salt_len, MCRYPT_DEV_URANDOM);
+ if ($buffer) {
+ $buffer_valid = true;
+ }
+ }
+ if (!$buffer_valid && function_exists('openssl_random_pseudo_bytes')) {
+ $buffer = openssl_random_pseudo_bytes($raw_salt_len);
+ if ($buffer) {
+ $buffer_valid = true;
+ }
+ }
+ if (!$buffer_valid && @is_readable('/dev/urandom')) {
+ $f = fopen('/dev/urandom', 'r');
+ $read = PasswordCompat\binary\_strlen($buffer);
+ while ($read < $raw_salt_len) {
+ $buffer .= fread($f, $raw_salt_len - $read);
+ $read = PasswordCompat\binary\_strlen($buffer);
+ }
+ fclose($f);
+ if ($read >= $raw_salt_len) {
+ $buffer_valid = true;
+ }
+ }
+ if (!$buffer_valid || PasswordCompat\binary\_strlen($buffer) < $raw_salt_len) {
+ $bl = PasswordCompat\binary\_strlen($buffer);
+ for ($i = 0; $i < $raw_salt_len; $i++) {
+ if ($i < $bl) {
+ $buffer[$i] = $buffer[$i] ^ chr(mt_rand(0, 255));
+ } else {
+ $buffer .= chr(mt_rand(0, 255));
+ }
+ }
+ }
+ $salt = $buffer;
+ $salt_requires_encoding = true;
+ }
+ if ($salt_requires_encoding) {
+ // encode string with the Base64 variant used by crypt
+ $base64_digits =
+ 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
+ $bcrypt64_digits =
+ './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
+
+ $base64_string = base64_encode($salt);
+ $salt = strtr(rtrim($base64_string, '='), $base64_digits, $bcrypt64_digits);
+ }
+ $salt = PasswordCompat\binary\_substr($salt, 0, $required_salt_len);
+
+ $hash = $hash_format . $salt;
+
+ $ret = crypt($password, $hash);
+
+ if (!is_string($ret) || PasswordCompat\binary\_strlen($ret) != $resultLength) {
+ 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' => PASSWORD_BCRYPT_DEFAULT_COST,
+ * ),
+ * )
+ *
+ * @param string $hash The password hash to extract info from
+ *
+ * @return array The array of information about the hash.
+ */
+ function password_get_info($hash) {
+ $return = array(
+ 'algo' => 0,
+ 'algoName' => 'unknown',
+ 'options' => array(),
+ );
+ if (PasswordCompat\binary\_substr($hash, 0, 4) == '$2y$' && PasswordCompat\binary\_strlen($hash) == 60) {
+ $return['algo'] = PASSWORD_BCRYPT;
+ $return['algoName'] = 'bcrypt';
+ list($cost) = sscanf($hash, "$2y$%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']) ? $options['cost'] : PASSWORD_BCRYPT_DEFAULT_COST;
+ if ($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) || PasswordCompat\binary\_strlen($ret) != PasswordCompat\binary\_strlen($hash) || PasswordCompat\binary\_strlen($ret) <= 13) {
+ return false;
+ }
+
+ $status = 0;
+ for ($i = 0; $i < PasswordCompat\binary\_strlen($ret); $i++) {
+ $status |= (ord($ret[$i]) ^ ord($hash[$i]));
+ }
+
+ return $status === 0;
+ }
+ }
+
+}
+
+namespace PasswordCompat\binary {
+
+ if (!function_exists('PasswordCompat\\binary\\_strlen')) {
+
+ /**
+ * Count the number of bytes in a string
+ *
+ * We cannot simply use strlen() for this, because it might be overwritten by the mbstring extension.
+ * In this case, strlen() will count the number of *characters* based on the internal encoding. A
+ * sequence of bytes might be regarded as a single multibyte character.
+ *
+ * @param string $binary_string The input string
+ *
+ * @internal
+ * @return int The number of bytes
+ */
+ function _strlen($binary_string) {
+ if (function_exists('mb_strlen')) {
+ return mb_strlen($binary_string, '8bit');
+ }
+ return strlen($binary_string);
+ }
+
+ /**
+ * Get a substring based on byte limits
+ *
+ * @see _strlen()
+ *
+ * @param string $binary_string The input string
+ * @param int $start
+ * @param int $length
+ *
+ * @internal
+ * @return string The substring
+ */
+ function _substr($binary_string, $start, $length) {
+ if (function_exists('mb_substr')) {
+ return mb_substr($binary_string, $start, $length, '8bit');
+ }
+ return substr($binary_string, $start, $length);
+ }
+
+ /**
+ * Check if current PHP version is compatible with the library
+ *
+ * @return boolean the check result
+ */
+ function check() {
+ static $pass = NULL;
+
+ if (is_null($pass)) {
+ if (function_exists('crypt')) {
+ $hash = '$2y$04$usesomesillystringfore7hnbRJHxXVLeakoG8K30oukPsA.ztMG';
+ $test = crypt("password", $hash);
+ $pass = $test == $hash;
+ } else {
+ $pass = false;
+ }
+ }
+ return $pass;
+ }
+
+ }
+}
\ No newline at end of file
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