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php_pass.php
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Sat, Sep 27, 10:39 PM

php_pass.php
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<?php
#
# Portable PHP password hashing framework.
#
# Version 0.3 / 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 {
protected $_itoa64;
protected $_iterationCountLog2;
protected $_portableHashes;
protected $_randomState;
public function __construct($iteration_count_log2, $portable_hashes)
{
$this->_itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
if ( $iteration_count_log2 < 4 || $iteration_count_log2 > 31 ) {
$iteration_count_log2 = 8;
}
$this->_iterationCountLog2 = $iteration_count_log2;
$this->_portableHashes = $portable_hashes;
$this->_randomState = microtime();
if ( function_exists('getmypid') ) {
$this->_randomState .= getmypid();
}
}
protected function _getRandomBytes($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->_randomState = md5(microtime() . $this->_randomState);
$output .= pack('H*', md5($this->_randomState));
}
$output = substr($output, 0, $count);
}
return $output;
}
protected function _encode64($input, $count)
{
$i = 0;
$output = '';
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 $output;
}
protected function _genSaltPrivate($input)
{
$output = '$P$';
$output .= $this->_itoa64[min($this->_iterationCountLog2 + ((PHP_VERSION >= '5') ? 5 : 3), 30)];
$output .= $this->_encode64($input, 6);
return $output;
}
protected function _cryptPrivate($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're kind of forced to use MD5 here since it's the only
# cryptographic primitive available in all versions of PHP
# currently in use. To implement our own low-level crypto
# in PHP would result in much worse performance and
# consequently in lower iteration counts and hashes that are
# quicker to crack (by non-PHP code).
if ( PHP_VERSION >= '5' ) {
$hash = md5($salt . $password, true);
do {
$hash = md5($hash . $password, true);
} while (--$count);
}
else {
$hash = pack('H*', md5($salt . $password));
do {
$hash = pack('H*', md5($hash . $password));
} while (--$count);
}
$output = substr($setting, 0, 12);
$output .= $this->_encode64($hash, 16);
return $output;
}
protected function _genSaltExtended($input)
{
$count_log2 = min($this->_iterationCountLog2 + 8, 24);
# This should be odd to not reveal weak DES keys, and the
# maximum valid value is (2**24 - 1) which is odd anyway.
$count = (1 << $count_log2) - 1;
$output = '_';
$output .= $this->_itoa64[$count & 0x3f];
$output .= $this->_itoa64[($count >> 6) & 0x3f];
$output .= $this->_itoa64[($count >> 12) & 0x3f];
$output .= $this->_itoa64[($count >> 18) & 0x3f];
$output .= $this->_encode64($input, 3);
return $output;
}
protected function _genSaltBlowfish($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->_iterationCountLog2 / 10);
$output .= chr(ord('0') + $this->_iterationCountLog2 % 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 $output;
}
public function hashPassword($password)
{
$random = '';
if ( CRYPT_BLOWFISH == 1 && !$this->_portableHashes ) {
$random = $this->_getRandomBytes(16);
$hash = crypt($password, $this->_genSaltBlowfish($random));
if ( strlen($hash) == 60 ) {
return $hash;
}
}
if ( CRYPT_EXT_DES == 1 && !$this->_portableHashes ) {
if ( strlen($random) < 3 ) {
$random = $this->_getRandomBytes(3);
}
$hash = crypt($password, $this->_genSaltExtended($random));
if ( strlen($hash) == 20 ) {
return $hash;
}
}
if ( strlen($random) < 6 ) {
$random = $this->_getRandomBytes(6);
}
$hash = $this->_cryptPrivate($password, $this->_genSaltPrivate($random));
if ( strlen($hash) == 34 ) {
return $hash;
}
# Returning '*' on error is safe here, but would _not_ be safe
# in a crypt(3)-like function used _both_ for generating new
# hashes and for validating passwords against existing hashes.
return '*';
}
public function checkPassword($password, $stored_hash)
{
$hash = $this->_cryptPrivate($password, $stored_hash);
if ( $hash[0] == '*' ) {
$hash = crypt($password, $stored_hash);
}
return $hash == $stored_hash;
}
}

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