packages/security/src/Helper/PasswordHash.php
<?php
namespace Moox\Security\Helper;
//
// Portable PHP password hashing framework.
//
// Version 0.5 / genuine.
//
// Written by Solar Designer <solar at openwall.com> in 2004-2006 and placed in
// the public domain. Revised in subsequent years, still public domain.
//
// There's absolutely no warranty.
//
// The homepage URL for this framework is:
//
// http://www.openwall.com/phpass/
//
// Please be sure to update the Version line if you edit this file in any way.
// It is suggested that you leave the main version number intact, but indicate
// your project name (after the slash) and add your own revision information.
//
// Please do not change the "private" password hashing method implemented in
// here, thereby making your hashes incompatible. However, if you must, please
// change the hash type identifier (the "$P$") to something different.
//
// Obviously, since this code is in the public domain, the above are not
// requirements (there can be none), but merely suggestions.
//
class PasswordHash
{
private $itoa64;
private $iteration_count_log2;
private $portable_hashes;
private $random_state;
/**
* Constructor
*
* @param int $iteration_count_log2
* @param bool $portable_hashes
*/
public function __construct($iteration_count_log2, $portable_hashes)
{
$this->itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
if ($iteration_count_log2 < 4 || $iteration_count_log2 > 31) {
$iteration_count_log2 = 8;
}
$this->iteration_count_log2 = $iteration_count_log2;
$this->portable_hashes = $portable_hashes;
$this->random_state = microtime();
if (function_exists('getmypid')) {
$this->random_state .= getmypid();
}
}
/**
* @param int $iteration_count_log2
* @param bool $portable_hashes
* @return void
*/
public function PasswordHash($iteration_count_log2, $portable_hashes)
{
self::__construct($iteration_count_log2, $portable_hashes);
}
/**
* @param int $count
* @return string
*/
public function get_random_bytes($count)
{
$output = '';
if (@is_readable('/dev/urandom') &&
($fh = @fopen('/dev/urandom', 'rb'))) {
$output = fread($fh, $count);
fclose($fh);
}
if (strlen($output) < $count) {
$output = '';
for ($i = 0; $i < $count; $i += 16) {
$this->random_state =
md5(microtime().$this->random_state);
$output .= md5($this->random_state, true);
}
$output = substr($output, 0, $count);
}
return $output;
}
/**
* @param string $input
* @param int $count
* @return string
*/
public function encode64($input, $count)
{
$output = '';
$i = 0;
do {
$value = ord($input[$i++]);
$output .= $this->itoa64[$value & 0x3F];
if ($i < $count) {
$value |= ord($input[$i]) << 8;
}
$output .= $this->itoa64[($value >> 6) & 0x3F];
if ($i++ >= $count) {
break;
}
if ($i < $count) {
$value |= ord($input[$i]) << 16;
}
$output .= $this->itoa64[($value >> 12) & 0x3F];
if ($i++ >= $count) {
break;
}
$output .= $this->itoa64[($value >> 18) & 0x3F];
} while ($i < $count);
return $output;
}
/**
* @param string $input
* @return string
*/
public function gensalt_private($input)
{
$output = '$P$';
$output .= $this->itoa64[min($this->iteration_count_log2 +
((PHP_VERSION >= '5') ? 5 : 3), 30)];
$output .= $this->encode64($input, 6);
return $output;
}
/**
* @param string $password
* @param string $setting
* @return string
*/
public function crypt_private($password, $setting)
{
$output = '*0';
if (substr($setting, 0, 2) === $output) {
$output = '*1';
}
$id = substr($setting, 0, 3);
// We use "$P$", phpBB3 uses "$H$" for the same thing
if ($id !== '$P$' && $id !== '$H$') {
return $output;
}
$count_log2 = strpos($this->itoa64, $setting[3]);
if ($count_log2 < 7 || $count_log2 > 30) {
return $output;
}
$count = 1 << $count_log2;
$salt = substr($setting, 4, 8);
if (strlen($salt) !== 8) {
return $output;
}
// We were kind of forced to use MD5 here since it's the only
// cryptographic primitive that was available in all versions
// of PHP in use. To implement our own low-level crypto in PHP
// would have resulted in much worse performance and
// consequently in lower iteration counts and hashes that are
// quicker to crack (by non-PHP code).
$hash = md5($salt.$password, true);
do {
$hash = md5($hash.$password, true);
} while (--$count);
$output = substr($setting, 0, 12);
$output .= $this->encode64($hash, 16);
return $output;
}
/**
* @param string $input
* @return string
*/
public function gensalt_blowfish($input)
{
// This one needs to use a different order of characters and a
// different encoding scheme from the one in encode64() above.
// We care because the last character in our encoded string will
// only represent 2 bits. While two known implementations of
// bcrypt will happily accept and correct a salt string which
// has the 4 unused bits set to non-zero, we do not want to take
// chances and we also do not want to waste an additional byte
// of entropy.
$itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
$output = '$2a$';
$output .= chr(ord('0') + $this->iteration_count_log2 / 10);
$output .= chr(ord('0') + $this->iteration_count_log2 % 10);
$output .= '$';
$i = 0;
do {
$c1 = ord($input[$i++]);
$output .= $itoa64[$c1 >> 2];
$c1 = ($c1 & 0x03) << 4;
if ($i >= 16) {
$output .= $itoa64[$c1];
break;
}
$c2 = ord($input[$i++]);
$c1 |= $c2 >> 4;
$output .= $itoa64[$c1];
$c1 = ($c2 & 0x0F) << 2;
$c2 = ord($input[$i++]);
$c1 |= $c2 >> 6;
$output .= $itoa64[$c1];
$output .= $itoa64[$c2 & 0x3F];
} while (1);
return $output;
}
/**
* @param string $password
*/
public function HashPassword($password)
{
$random = '';
if (CRYPT_BLOWFISH === 1 && ! $this->portable_hashes) {
$random = $this->get_random_bytes(16);
$hash =
crypt($password, $this->gensalt_blowfish($random));
if (strlen($hash) === 60) {
return $hash;
}
}
if (strlen($random) < 6) {
$random = $this->get_random_bytes(6);
}
$hash =
$this->crypt_private($password,
$this->gensalt_private($random));
if (strlen($hash) === 34) {
return $hash;
}
// Returning '*' on error is safe here, but would _not_ be safe
// in a crypt(3)-like function used _both_ for generating new
// hashes and for validating passwords against existing hashes.
return '*';
}
/**
* @param string $password
* @param string $stored_hash
* @return bool
*/
public function CheckPassword($password, $stored_hash)
{
$hash = $this->crypt_private($password, $stored_hash);
if ($hash[0] === '*') {
$hash = crypt($password, $stored_hash);
}
// This is not constant-time. In order to keep the code simple,
// for timing safety we currently rely on the salts being
// unpredictable, which they are at least in the non-fallback
// cases (that is, when we use /dev/urandom and bcrypt).
return $hash === $stored_hash;
}
}