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<?php |
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/** |
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* @author Todd Burry <[email protected]> |
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* @copyright 2005 phpBB Group (Original source code) |
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* @copyright 2009-2014 Vanilla Forums Inc. (Source code changes) |
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* @license http://opensource.org/licenses/gpl-license.php GNU Public License |
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* |
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* This class adapts functions from phpBB 3 (/includes/functions.php). Any source code that was taken from the |
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* phpBB project is copyright 2005 phpBB Group. Any source code changes are copyright 2009-2014 Vanilla Forums Inc. |
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* |
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*/ |
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namespace Garden\Password; |
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/** |
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* Implements phpBB's password hashing algorithm. |
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*/ |
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class PhpbbPassword implements IPassword { |
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const ITOA64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'; |
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/** |
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* Check for a correct password. |
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* |
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* @param string $password The password in plain text. |
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* @param string $hash The stored password hash. |
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* @return bool Returns true if the password is correct, false if not. |
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*/ |
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public function verify($password, $hash) { |
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if (strlen($hash) == 34) { |
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return ($this->cryptPrivate($password, $hash) === $hash) ? true : false; |
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} |
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return (md5($password) === $hash) ? true : false; |
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} |
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/** |
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* The crypt function/replacement. |
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* |
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* @param string $password The password to encrypt. |
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* @param string $setting The hash prefix setting. It should start with $H$. |
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* @return string The encypted password. |
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*/ |
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private function cryptPrivate($password, $setting) { |
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$itoa64 = PhpbbPassword::ITOA64; |
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$output = '*'; |
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// Check for correct hash |
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if (substr($setting, 0, 3) != '$H$') { |
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return $output; |
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} |
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3 |
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$count_log2 = strpos($itoa64, $setting[3]); |
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3 |
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if ($count_log2 < 7 || $count_log2 > 30) { |
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return $output; |
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} |
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3 |
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$count = 1 << $count_log2; |
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3 |
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$salt = substr($setting, 4, 8); |
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3 |
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if (strlen($salt) != 8) { |
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return $output; |
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} |
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/** |
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* We're kind of forced to use MD5 here since it's the only |
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* cryptographic primitive available in all versions of PHP |
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* currently in use. To implement our own low-level crypto |
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* in PHP would result in much worse performance and |
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* consequently in lower iteration counts and hashes that are |
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* quicker to crack (by non-PHP code). |
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*/ |
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3 |
View Code Duplication |
if (PHP_VERSION >= 5) { |
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3 |
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$hash = md5($salt.$password, true); |
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do { |
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$hash = md5($hash.$password, true); |
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3 |
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} while (--$count); |
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3 |
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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 (--$count); |
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} |
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3 |
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$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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/** |
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* Encode hash. |
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* |
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* @param string $input The input to encode. |
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* @param int $count The number of characters to encode. |
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* @return string The encoded string. |
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*/ |
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protected function encode64($input, $count) { |
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3 |
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$itoa64 = PhpbbPassword::ITOA64; |
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$output = ''; |
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3 |
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$i = 0; |
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do { |
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3 |
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$value = ord($input[$i++]); |
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$output .= $itoa64[$value & 0x3f]; |
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3 |
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if ($i < $count) { |
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$value |= ord($input[$i]) << 8; |
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} |
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$output .= $itoa64[($value >> 6) & 0x3f]; |
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3 |
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if ($i++ >= $count) { |
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break; |
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} |
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3 |
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if ($i < $count) { |
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3 |
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$value |= ord($input[$i]) << 16; |
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3 |
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} |
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3 |
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$output .= $itoa64[($value >> 12) & 0x3f]; |
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3 |
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if ($i++ >= $count) { |
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break; |
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} |
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3 |
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$output .= $itoa64[($value >> 18) & 0x3f]; |
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3 |
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} while ($i < $count); |
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return $output; |
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} |
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/** |
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* Hashes a plaintext password. |
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* |
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* @param string $password The password to hash. |
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* @return string Returns the hashed password. |
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*/ |
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3 |
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public function hash($password) { |
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3 |
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$random = openssl_random_pseudo_bytes(6); |
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3 |
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$hash = $this->cryptPrivate($password, $this->gensaltPrivate($random)); |
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3 |
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if (strlen($hash) == 34) { |
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return $hash; |
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} |
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return null; |
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} |
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/** |
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* Generate a password salt based on the given input string. |
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* |
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* @param string $input The input string to generate the salt from. |
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* @return string Returns the password salt prefixed with `$P$`. |
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*/ |
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3 |
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private function gensaltPrivate($input) { |
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$itoa64 = PhpbbPassword::ITOA64; |
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3 |
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$output = '$H$'; |
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3 |
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$output .= $itoa64[min(8 + ((PHP_VERSION >= '5') ? 5 : 3), 30)]; |
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3 |
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$output .= $this->encode64($input, 6); |
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3 |
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return $output; |
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} |
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/** |
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* Checks if a given password hash needs to be re-hashed to to a stronger algorithm. |
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* |
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* @param string $hash The hash to check. |
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* @return bool Returns `true` |
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*/ |
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1 |
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public function needsRehash($hash) { |
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1 |
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return $hash === '*'; |
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} |
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} |
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vanilla /
garden
