Edit: class-phpass.php

<?php
/**
 * Portable PHP password hashing framework.
 * @package phpass
 * @since 2.5.0
 * @version 0.5 / WordPress
 * @link https://www.openwall.com/phpass/
 */

#
# Portable PHP password hashing framework.
#
# Version 0.5.4 / WordPress.
#
# 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.
#

/**
 * Portable PHP password hashing framework.
 *
 * @package phpass
 * @version 0.5 / WordPress
 * @link https://www.openwall.com/phpass/
 * @since 2.5.0
 */
class PasswordHash {
	var $itoa64;
	var $iteration_count_log2;
	var $portable_hashes;
	var $random_state;

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();
		}
	}

function PasswordHash($iteration_count_log2, $portable_hashes)
	{
		self::__construct($iteration_count_log2, $portable_hashes);
	}

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;
	}

return $output;
	}

function gensalt_private($input)
	{
		$output = '$P$';
		$output .= $this->itoa64[min($this->iteration_count_log2 + 5,
		    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 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;
	}

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((int)(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)
	{
		if ( strlen( $password ) > 4096 ) {
			return '*';
		}

$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 '*';
	}

function CheckPassword($password, $stored_hash)
	{
		if ( strlen( $password ) > 4096 ) {
			return false;
		}

$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;
	}
}

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