334 lines
9.4 KiB
PHP
334 lines
9.4 KiB
PHP
<?php
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namespace Ozh\Phpass;
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/**
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*
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* Portable PHP password hashing framework.
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*
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* Originally written by Solar Designer <solar at openwall.com> in 2004-2006
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*
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* Modernized by Hautelook at https://github.com/hautelook/phpass
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*
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* Slightly repacked by Ozh to extend compatibility from PHP 5.3 to 7+ in a single file
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*
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* There's absolutely no warranty.
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*
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* The homepage URL for this framework is:
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*
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* http://www.openwall.com/phpass/
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*
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* Please be sure to update the Version line if you edit this file in any way.
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* It is suggested that you leave the main version number intact, but indicate
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* your project name (after the slash) and add your own revision information.
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*
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* Please do not change the "private" password hashing method implemented in
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* here, thereby making your hashes incompatible. However, if you must, please
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* change the hash type identifier (the "$P$") to something different.
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*
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* Obviously, since this code is in the public domain, the above are not
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* requirements (there can be none), but merely suggestions.
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*
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* @author Solar Designer <solar@openwall.com>
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*/
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class PasswordHash
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{
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private $itoa64;
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private $iteration_count_log2;
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private $portable_hashes;
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private $random_state;
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/**
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* Constructor
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*
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* @param int $iteration_count_log2
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* @param boolean $portable_hashes
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*/
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public function __construct($iteration_count_log2, $portable_hashes)
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{
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$this->itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
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if ($iteration_count_log2 < 4 || $iteration_count_log2 > 31) {
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$iteration_count_log2 = 8;
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}
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$this->iteration_count_log2 = $iteration_count_log2;
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$this->portable_hashes = $portable_hashes;
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$this->random_state = microtime();
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if (function_exists('getmypid')) {
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$this->random_state .= getmypid();
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}
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}
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/**
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* @param int $count
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* @return String
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*/
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public function get_random_bytes($count)
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{
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$output = '';
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// PHP 7+
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if (is_callable('random_bytes')) {
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return random_bytes($count);
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}
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if (@is_readable('/dev/urandom') &&
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($fh = @fopen('/dev/urandom', 'rb'))) {
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$output = fread($fh, $count);
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fclose($fh);
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}
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if (strlen($output) < $count) {
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$output = '';
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for ($i = 0; $i < $count; $i += 16) {
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$this->random_state =
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md5(microtime() . $this->random_state);
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$output .= md5($this->random_state, TRUE);
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}
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$output = substr($output, 0, $count);
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}
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return $output;
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}
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/**
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* @param String $input
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* @param int $count
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* @return String
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*/
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public function encode64($input, $count)
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{
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$output = '';
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$i = 0;
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do {
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$value = ord($input[$i++]);
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$output .= $this->itoa64[$value & 0x3f];
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if ($i < $count) {
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$value |= ord($input[$i]) << 8;
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}
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$output .= $this->itoa64[($value >> 6) & 0x3f];
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if ($i++ >= $count) {
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break;
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}
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if ($i < $count) {
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$value |= ord($input[$i]) << 16;
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}
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$output .= $this->itoa64[($value >> 12) & 0x3f];
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if ($i++ >= $count) {
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break;
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}
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$output .= $this->itoa64[($value >> 18) & 0x3f];
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} while ($i < $count);
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return $output;
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}
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/**
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* @param String $input
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* @return String
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*/
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public function gensalt_private($input)
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{
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$output = '$P$';
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$output .= $this->itoa64[min($this->iteration_count_log2 +
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((PHP_VERSION >= '5') ? 5 : 3), 30)];
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$output .= $this->encode64($input, 6);
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return $output;
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}
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/**
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* @param String $password
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* @param String $setting
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* @return String
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*/
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public function crypt_private($password, $setting)
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{
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$output = '*0';
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if (substr($setting, 0, 2) === $output) {
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$output = '*1';
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}
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$id = substr($setting, 0, 3);
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# We use "$P$", phpBB3 uses "$H$" for the same thing
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if ($id !== '$P$' && $id !== '$H$') {
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return $output;
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}
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$count_log2 = strpos($this->itoa64, $setting[3]);
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if ($count_log2 < 7 || $count_log2 > 30) {
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return $output;
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}
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$count = 1 << $count_log2;
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$salt = substr($setting, 4, 8);
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if (strlen($salt) != 8) {
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return $output;
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}
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// We're kind of forced to use MD5 here since it's the only
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// cryptographic primitive available in all versions of PHP
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// currently in use. To implement our own low-level crypto
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// in PHP would result in much worse performance and
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// consequently in lower iteration counts and hashes that are
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// quicker to crack (by non-PHP code).
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$hash = md5($salt . $password, TRUE);
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do {
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$hash = md5($hash . $password, TRUE);
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} while (--$count);
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$output = substr($setting, 0, 12);
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$output .= $this->encode64($hash, 16);
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return $output;
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}
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/**
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* @param String $input
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* @return String
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*/
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public function gensalt_blowfish($input)
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{
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// This one needs to use a different order of characters and a
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// different encoding scheme from the one in encode64() above.
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// We care because the last character in our encoded string will
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// only represent 2 bits. While two known implementations of
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// bcrypt will happily accept and correct a salt string which
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// has the 4 unused bits set to non-zero, we do not want to take
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// chances and we also do not want to waste an additional byte
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// of entropy.
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$itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
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$output = '$2a$';
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$output .= chr(ord('0') + $this->iteration_count_log2 / 10);
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$output .= chr(ord('0') + $this->iteration_count_log2 % 10);
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$output .= '$';
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$i = 0;
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do {
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$c1 = ord($input[$i++]);
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$output .= $itoa64[$c1 >> 2];
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$c1 = ($c1 & 0x03) << 4;
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if ($i >= 16) {
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$output .= $itoa64[$c1];
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break;
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}
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$c2 = ord($input[$i++]);
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$c1 |= $c2 >> 4;
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$output .= $itoa64[$c1];
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$c1 = ($c2 & 0x0f) << 2;
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$c2 = ord($input[$i++]);
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$c1 |= $c2 >> 6;
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$output .= $itoa64[$c1];
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$output .= $itoa64[$c2 & 0x3f];
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} while (1);
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return $output;
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}
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/**
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* @param String $password
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*/
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public function HashPassword($password)
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{
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$random = '';
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if (CRYPT_BLOWFISH == 1 && !$this->portable_hashes) {
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$random = $this->get_random_bytes(16);
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$hash =
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crypt($password, $this->gensalt_blowfish($random));
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if (strlen($hash) == 60) {
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return $hash;
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}
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}
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if (strlen($random) < 6) {
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$random = $this->get_random_bytes(6);
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}
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$hash =
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$this->crypt_private($password,
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$this->gensalt_private($random));
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if (strlen($hash) == 34) {
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return $hash;
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}
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// Returning '*' on error is safe here, but would _not_ be safe
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// in a crypt(3)-like function used _both_ for generating new
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// hashes and for validating passwords against existing hashes.
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return '*';
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}
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/**
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* @param String $password
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* @param String $stored_hash
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* @return boolean
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*/
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public function CheckPassword($password, $stored_hash)
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{
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$hash = $this->crypt_private($password, $stored_hash);
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if ($hash[0] == '*') {
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$hash = crypt($password, $stored_hash);
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}
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return hash_equals($stored_hash, $hash);
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}
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}
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/**
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* hash_equals compatibility function
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*
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* @package CodeIgniter
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* @author EllisLab Dev Team
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* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
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* @copyright Copyright (c) 2014 - 2017, British Columbia Institute of Technology (http://bcit.ca/)
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* @license http://opensource.org/licenses/MIT MIT License
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* @link https://codeigniter.com
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*
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* Source: https://github.com/bcit-ci/CodeIgniter/blob/3.1.4/system/core/compat/hash.php
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* For PHP < 5.6
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*/
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// @codeCoverageIgnoreStart
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if ( ! function_exists('hash_equals'))
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{
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/**
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* hash_equals()
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*
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* @link http://php.net/hash_equals
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* @param string $known_string
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* @param string $user_string
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* @return bool
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*/
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function hash_equals($known_string, $user_string)
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{
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if ( ! is_string($known_string))
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{
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trigger_error('hash_equals(): Expected known_string to be a string, '.strtolower(gettype($known_string)).' given', E_USER_WARNING);
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return FALSE;
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}
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elseif ( ! is_string($user_string))
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{
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trigger_error('hash_equals(): Expected user_string to be a string, '.strtolower(gettype($user_string)).' given', E_USER_WARNING);
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return FALSE;
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}
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elseif (($length = strlen($known_string)) !== strlen($user_string))
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{
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return FALSE;
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}
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$diff = 0;
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for ($i = 0; $i < $length; $i++)
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{
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$diff |= ord($known_string[$i]) ^ ord($user_string[$i]);
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}
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return ($diff === 0);
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}
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}
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// @codeCoverageIgnoreEnd
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