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<?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 $random_state;
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public function __construct()
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{
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// Constructor's functionality here, if you have any.
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}
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function PasswordHash($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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