Kleeja/includes/phpass.php

<?php
//
// Portable PHP password hashing framework.
//
// Version 0.5.4 / 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.
//

//no for directly open
if (! defined('IN_COMMON'))
{
    exit();
}

class PasswordHash
{
    public $itoa64;
    public $iteration_count_log2;
    public $portable_hashes;
    public $random_state;

    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();
        }
    }

    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;
    }

    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;
    }

    public function gensalt_private($input)
    {
        $output = '$P$';
        $output .= $this->itoa64[min($this->iteration_count_log2 + 5, 30)];
        $output .= $this->encode64($input, 6);

        return $output;
    }

    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;
    }

    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((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;
    }

    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 '*';
    }

    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;
    }
}