<?php

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#

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# Portable PHP password hashing framework.

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#

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# Version 0.3 / genuine.

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#

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# Written by Solar Designer <solar at openwall.com> in 2004-2006 and placed in

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# the public domain. Revised in subsequent years, still public domain.

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#

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# There's absolutely no warranty.

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#

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# The homepage URL for this framework is:

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#

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# http://www.openwall.com/phpass/

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#

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# Please be sure to update the Version line if you edit this file in any way.

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# It is suggested that you leave the main version number intact, but indicate

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# your project name (after the slash) and add your own revision information.

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#

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# Please do not change the "private" password hashing method implemented in

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# here, thereby making your hashes incompatible. However, if you must, please

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# change the hash type identifier (the "$P$") to something different.

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#

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# Obviously, since this code is in the public domain, the above are not

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# requirements (there can be none), but merely suggestions.

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#

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class PasswordHash {

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var $itoa64;

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var $iteration_count_log2;

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var $portable_hashes;

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var $random_state;

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function PasswordHash($iteration_count_log2, $portable_hashes)

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{

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$this->itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';

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if ($iteration_count_log2 < 4 || $iteration_count_log2 > 31)

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$iteration_count_log2 = 8;

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$this->iteration_count_log2 = $iteration_count_log2;

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$this->portable_hashes = $portable_hashes;

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$this->random_state = microtime();

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if (function_exists('getmypid'))

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$this->random_state .= getmypid();

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}

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function get_random_bytes($count)

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{

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$output = '';

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if (@is_readable('/dev/urandom') &&

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($fh = @fopen('/dev/urandom', 'rb'))) {

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$output = fread($fh, $count);

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fclose($fh);

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}

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if (strlen($output) < $count) {

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$output = '';

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for ($i = 0; $i < $count; $i += 16) {

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$this->random_state =

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md5(microtime() . $this->random_state);

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$output .=

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pack('H*', md5($this->random_state));

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}

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$output = substr($output, 0, $count);

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}

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return $output;

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}

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function encode64($input, $count)

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{

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$output = '';

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$i = 0;

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do {

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$value = ord($input[$i++]);

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$output .= $this->itoa64[$value & 0x3f];

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if ($i < $count)

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$value |= ord($input[$i]) << 8;

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$output .= $this->itoa64[($value >> 6) & 0x3f];

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if ($i++ >= $count)

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break;

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if ($i < $count)

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$value |= ord($input[$i]) << 16;

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$output .= $this->itoa64[($value >> 12) & 0x3f];

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if ($i++ >= $count)

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break;

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$output .= $this->itoa64[($value >> 18) & 0x3f];

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} while ($i < $count);

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return $output;

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}

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function gensalt_private($input)

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{

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$output = '$P$';

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$output .= $this->itoa64[min($this->iteration_count_log2 +

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((PHP_VERSION >= '5') ? 5 : 3), 30)];

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$output .= $this->encode64($input, 6);

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return $output;

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}

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function crypt_private($password, $setting)

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{

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$output = '*0';

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if (substr($setting, 0, 2) == $output)

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$output = '*1';

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$id = substr($setting, 0, 3);

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# We use "$P$", phpBB3 uses "$H$" for the same thing

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if ($id != '$P$' && $id != '$H$')

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return $output;

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$count_log2 = strpos($this->itoa64, $setting[3]);

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if ($count_log2 < 7 || $count_log2 > 30)

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return $output;

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$count = 1 << $count_log2;

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$salt = substr($setting, 4, 8);

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if (strlen($salt) != 8)

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return $output;

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# We're kind of forced to use MD5 here since it's the only

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# cryptographic primitive available in all versions of PHP

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# currently in use. To implement our own low-level crypto

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# in PHP would result in much worse performance and

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# consequently in lower iteration counts and hashes that are

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# quicker to crack (by non-PHP code).

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if (PHP_VERSION >= '5') {

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$hash = md5($salt . $password, TRUE);

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do {

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$hash = md5($hash . $password, TRUE);

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} while (--$count);

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} else {

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$hash = pack('H*', md5($salt . $password));

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do {

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$hash = pack('H*', md5($hash . $password));

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} while (--$count);

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}

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$output = substr($setting, 0, 12);

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$output .= $this->encode64($hash, 16);

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return $output;

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}

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function gensalt_extended($input)

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{

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$count_log2 = min($this->iteration_count_log2 + 8, 24);

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# This should be odd to not reveal weak DES keys, and the

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# maximum valid value is (2**24 - 1) which is odd anyway.

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$count = (1 << $count_log2) - 1;

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$output = '_';

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$output .= $this->itoa64[$count & 0x3f];

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$output .= $this->itoa64[($count >> 6) & 0x3f];

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$output .= $this->itoa64[($count >> 12) & 0x3f];

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$output .= $this->itoa64[($count >> 18) & 0x3f];

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$output .= $this->encode64($input, 3);

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return $output;

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}

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function gensalt_blowfish($input)

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{

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# This one needs to use a different order of characters and a

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# different encoding scheme from the one in encode64() above.

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# We care because the last character in our encoded string will

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# only represent 2 bits. While two known implementations of

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# bcrypt will happily accept and correct a salt string which

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# has the 4 unused bits set to non-zero, we do not want to take

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# chances and we also do not want to waste an additional byte

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# of entropy.

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$itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';

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$output = '$2a$';

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$output .= chr(ord('0') + $this->iteration_count_log2 / 10);

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$output .= chr(ord('0') + $this->iteration_count_log2 % 10);

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$output .= '$';

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$i = 0;

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do {

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$c1 = ord($input[$i++]);

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$output .= $itoa64[$c1 >> 2];

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$c1 = ($c1 & 0x03) << 4;

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if ($i >= 16) {

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$output .= $itoa64[$c1];

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break;

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}

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$c2 = ord($input[$i++]);

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$c1 |= $c2 >> 4;

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$output .= $itoa64[$c1];

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$c1 = ($c2 & 0x0f) << 2;

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$c2 = ord($input[$i++]);

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$c1 |= $c2 >> 6;

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$output .= $itoa64[$c1];

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$output .= $itoa64[$c2 & 0x3f];

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} while (1);

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return $output;

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}

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function HashPassword($password)

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{

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$random = '';

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if (CRYPT_BLOWFISH == 1 && !$this->portable_hashes) {

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$random = $this->get_random_bytes(16);

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$hash =

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crypt($password, $this->gensalt_blowfish($random));

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if (strlen($hash) == 60)

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return $hash;

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}

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if (CRYPT_EXT_DES == 1 && !$this->portable_hashes) {

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if (strlen($random) < 3)

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$random = $this->get_random_bytes(3);

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$hash =

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crypt($password, $this->gensalt_extended($random));

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if (strlen($hash) == 20)

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return $hash;

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}

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if (strlen($random) < 6)

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$random = $this->get_random_bytes(6);

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$hash =

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$this->crypt_private($password,

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$this->gensalt_private($random));

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if (strlen($hash) == 34)

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return $hash;

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# Returning '*' on error is safe here, but would _not_ be safe

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# in a crypt(3)-like function used _both_ for generating new

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# hashes and for validating passwords against existing hashes.

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return '*';

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}

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function CheckPassword($password, $stored_hash)

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{

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$hash = $this->crypt_private($password, $stored_hash);

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if ($hash[0] == '*')

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$hash = crypt($password, $stored_hash);

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return $hash == $stored_hash;

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}

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}

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