added files
This commit is contained in:
Ian Christensen
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<?php (defined('BASEPATH')) OR exit('No direct script access allowed');␍
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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 $random_state;␍
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␍
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function PasswordHash($iteration_count_log2, $portable_hashes)␍
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{␍
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$this->itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';␍
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␍
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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 = $iteration_count_log2;␍
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␍
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$this->portable_hashes = $portable_hashes;␍
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␍
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$this->random_state = microtime();␍
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if (function_exists('getmypid'))␍
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$this->random_state .= getmypid();␍
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}␍
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␍
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function get_random_bytes($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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␍
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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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␍
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return $output;␍
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}␍
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␍
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function encode64($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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␍
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return $output;␍
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}␍
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␍
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function gensalt_private($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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␍
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return $output;␍
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}␍
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␍
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function crypt_private($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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␍
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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 $output;␍
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␍
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$count_log2 = strpos($this->itoa64, $setting[3]);␍
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if ($count_log2 < 7 || $count_log2 > 30)␍
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return $output;␍
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␍
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$count = 1 << $count_log2;␍
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␍
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$salt = substr($setting, 4, 8);␍
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if (strlen($salt) != 8)␍
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return $output;␍
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␍
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# We're kind of forced to use MD5 here since it's the only␍
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# cryptographic primitive available in all versions of PHP␍
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# currently in use. To implement our own low-level crypto␍
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# in PHP would result in much worse performance and␍
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# consequently in lower iteration counts and hashes that are␍
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# quicker to crack (by non-PHP code).␍
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if (PHP_VERSION >= '5') {␍
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$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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␍
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$output = substr($setting, 0, 12);␍
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$output .= $this->encode64($hash, 16);␍
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␍
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return $output;␍
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}␍
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␍
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function gensalt_extended($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 << $count_log2) - 1;␍
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␍
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$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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␍
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$output .= $this->encode64($input, 3);␍
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␍
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return $output;␍
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}␍
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␍
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function gensalt_blowfish($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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$itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';␍
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␍
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$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 .= '$';␍
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␍
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$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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␍
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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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␍
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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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␍
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return $output;␍
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}␍
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␍
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function HashPassword($password)␍
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{␍
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$random = '';␍
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␍
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if (CRYPT_BLOWFISH == 1 && !$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 $hash;␍
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}␍
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␍
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if (CRYPT_EXT_DES == 1 && !$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 $hash;␍
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}␍
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␍
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if (strlen($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 $hash;␍
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␍
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# Returning '*' on error is safe here, but would _not_ be safe␍
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# in a crypt(3)-like function used _both_ for generating new␍
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# hashes and for validating passwords against existing hashes.␍
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return '*';␍
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}␍
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␍
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function CheckPassword($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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␍
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return $hash == $stored_hash;␍
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}␍
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}␍
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␍
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/* End of file phpass_helper.php */␍
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/* Location: ./application/helpers/phpass_helper.php */
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