我即将将phpass实施到一个新的应用程序中，因为它具有安全性的理论和技术论据。这当然不是唯一的安全措施，但对于散列密码，这在我看来是最好的。
但是，在查看它的源代码时，我并没有真正感到高兴。它违背了我的一些最基本的代码约定，尤其是在安全性方面。
return $hash == $stored_hash;
我总是===在围绕安全性的代码上使用相同的运算符 ()。
if ($hash[0] == '*')
$hash = crypt($password, $stored_hash);
{我总是使用带有 if 的大括号。它们是否在同一条线上并不重要，但即使有可能省略它们也不会给我带来好的感觉。
此外，没有办法强制使用 CRYPT_BLOWFISH 方法。现在我通过在我自己的包装器中检查长度是否正好是 60 个字符来做到这一点。
我想知道是否有人知道更新版本？一个由一个更大的社区维护和检查的改进版，然后只有一个人？正如作者本人已经建议的那样，一个较新的版本可以使用 PHP5，例如无缓冲读取？
或者，也许我只是没有真正原因的偏执狂。
如果是新应用程序，请使用https://github.com/ircmaxell/password_compat进行密码散列。它适用于 PHP >= 5.3.7，并重新实现了 PHP 5.5 即将推出的密码功能。
除了安全密码散列之外，确实没有其他选择。
我的帖子是为那些喜欢 phpass 的人准备的，因为它具有向后兼容性，但又想使用改进的版本。
我对 phpass 使用了以下改进：
完整代码，评论中的版本已更新，附加更改：
<?php
#
# Portable PHP password hashing framework.
#
# Version 0.3 / okaresz.v1
#
# Written by Solar Designer <solar at openwall.com> in 2004-2006 and placed in
# the public domain. Revised in subsequent years, still public domain.
#
# There's absolutely no warranty.
#
# The homepage URL for this framework is:
#
# http://www.openwall.com/phpass/
#
# Please be sure to update the Version line if you edit this file in any way.
# It is suggested that you leave the main version number intact, but indicate
# your project name (after the slash) and add your own revision information.
#
# Please do not change the "private" password hashing method implemented in
# here, thereby making your hashes incompatible. However, if you must, please
# change the hash type identifier (the "$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.
#
# okaresz.v1:
#
# * Introducing more data to $random_state in the constuctor.
# * Improve get_random_bytes() by adding more methods and by introducing more data to the entropy pool.
# Some fo the code is from the SecurityMultiTool by padraic: https://github.com/padraic/SecurityMultiTool
# and from ircmaxell's RandomLib: https://github.com/ircmaxell/RandomLib
# and password_compat https://github.com/ircmaxell/password_compat
# * In gensalt_blowfish() if PHP_VERSION >= 5.3.7, use the new, fixed BLOWFISH salt id.
#
class PasswordHash {
var $itoa64;
var $iteration_count_log2;
var $portable_hashes;
var $random_state;
function PasswordHash($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();
$this->random_state .= md5(serialize($_SERVER));
}
function get_random_bytes($count)
{
$output = '';
if( function_exists('openssl_random_pseudo_bytes' ) )
{
$output = openssl_random_pseudo_bytes($count, $usable);
if (true === $usable) {
return $output;
}
}
if( function_exists('mcrypt_create_iv')
&& (version_compare(PHP_VERSION, '5.3.0') >= 0 )
|| (strtoupper(substr(PHP_OS, 0, 3)) !== 'WIN')
&& !defined('PHALANGER')
) {
$output = mcrypt_create_iv($count, MCRYPT_DEV_URANDOM);
if ($output !== false && strlen($output) === $count) {
return $output;
}
}
if (is_readable('/dev/urandom') &&
($fh = @fopen('/dev/urandom', 'rb'))) {
$output = fread($fh, $count);
fclose($fh);
}
if (strlen($output) < $count) {
$output = '';
$seed = microtime() . memory_get_usage();
if( function_exists('gc_collect_cycles') )
{ gc_collect_cycles(); }
else
{
$i = 0;
while( $i < 32)
{ $i += 1+(int)round(lcg_value()); }
}
$this->random_state .= $seed . microtime();
for ($i = 0; $i < $count; $i += 16)
{
$this->random_state = md5(microtime() . $this->random_state);
$output .= pack('H*', md5(substr($this->random_state,0,16)));
}
$output = substr($output, 0, $count);
}
return $output;
}
function encode64($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 $output;
}
function gensalt_private($input)
{
$output = '$P$';
$output .= $this->itoa64[min($this->iteration_count_log2 +
((PHP_VERSION >= '5') ? 5 : 3), 30)];
$output .= $this->encode64($input, 6);
return $output;
}
function crypt_private($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'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 $output;
}
function gensalt_extended($input)
{
$count_log2 = min($this->iteration_count_log2 + 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 $output;
}
function gensalt_blowfish($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 = (version_compare(PHP_VERSION, '5.3.7') >= 0)? '$2y$' : '$2a$';
$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 $output;
}
function HashPassword($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 $hash;
}
if (CRYPT_EXT_DES == 1 && !$this->portable_hashes) {
if (strlen($random) < 3)
$random = $this->get_random_bytes(3);
$hash =
crypt($password, $this->gensalt_extended($random));
if (strlen($hash) == 20)
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 $hash;
# Returning '*' on error is safe here, but would _not_ be safe
# in a crypt(3)-like function used _both_ for generating new
# hashes and for validating passwords against existing hashes.
return '*';
}
function CheckPassword($password, $stored_hash)
{
$hash = $this->crypt_private($password, $stored_hash);
if ($hash[0] == '*')
$hash = crypt($password, $stored_hash);
return $hash == $stored_hash;
}
}
?>