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<?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'])) {

                        $cost = (int)$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_req_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_req_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')) {

                    $strong = false;

                    $buffer = openssl_random_pseudo_bytes($raw_salt_len, $strong);

                    if ($buffer && $strong) {

                        $buffer_valid = true;

                    }

                }

                if (!$buffer_valid && @is_readable('/dev/urandom')) {

                    $file = fopen('/dev/urandom', 'r');

                    $read = 0;

                    $local_buffer = '';

                    while ($read < $raw_salt_len) {

                        $local_buffer .= fread($file, $raw_salt_len - $read);

                        $read = PasswordCompat\binary\_strlen($local_buffer);

                    }

                    fclose($file);

                    if ($read >= $raw_salt_len) {

                        $buffer_valid = true;

                    }

                    $buffer = str_pad($buffer, $raw_salt_len, "\0") ^ str_pad($local_buffer, $raw_salt_len, "\0");

                }

                if (!$buffer_valid || PasswordCompat\binary\_strlen($buffer) < $raw_salt_len) {

                    $buffer_length = PasswordCompat\binary\_strlen($buffer);

                    for ($i = 0;$i < $raw_salt_len;$i++) {

                        if ($i < $buffer_length) {

                            $buffer[$i] = $buffer[$i] ^ chr(mt_rand(0, 255));

                        }

                        else {

                            $buffer .= chr(mt_rand(0, 255));

                        }

                    }

                }

                $salt = $buffer;

                $salt_req_encoding = true;

            }

            if ($salt_req_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 ($info['algo'] !== (int)$algo) {

                return true;

            }

            switch ($algo) {

                case PASSWORD_BCRYPT:

                    $cost = isset($options['cost']) ? (int)$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;

        }

    }

}