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<?php
/**
* PuTTY Formatted DSA Key Handler
*
* puttygen does not generate DSA keys with an N of anything other than 160, however,
* it can still load them and convert them. PuTTY will load them, too, but SSH servers
* won't accept them. Since PuTTY formatted keys are primarily used with SSH this makes
* keys with N > 160 kinda useless, hence this handlers not supporting such keys.
*
* PHP version 5
*
* @category Crypt
* @package DSA
* @author Jim Wigginton <terrafrost@php.net>
* @copyright 2015 Jim Wigginton
* @license http://www.opensource.org/licenses/mit-license.html MIT License
* @link http://phpseclib.sourceforge.net
*/
namespace phpseclib3\Crypt\DSA\Formats\Keys;
use phpseclib3\Math\BigInteger;
use phpseclib3\Common\Functions\Strings;
use phpseclib3\Crypt\Common\Formats\Keys\PuTTY as Progenitor;
/**
* PuTTY Formatted DSA Key Handler
*
* @package DSA
* @author Jim Wigginton <terrafrost@php.net>
* @access public
*/
abstract class PuTTY extends Progenitor
{
/**
* Public Handler
*
* @var string
* @access private
*/
const PUBLIC_HANDLER = 'phpseclib3\Crypt\DSA\Formats\Keys\OpenSSH';
/**
* Algorithm Identifier
*
* @var array
* @access private
*/
protected static $types = ['ssh-dss'];
/**
* Break a public or private key down into its constituent components
*
* @access public
* @param string $key
* @param string $password optional
* @return array
*/
public static function load($key, $password = '')
{
$components = parent::load($key, $password);
if (!isset($components['private'])) {
return $components;
}
extract($components);
unset($components['public'], $components['private']);
list($p, $q, $g, $y) = Strings::unpackSSH2('iiii', $public);
list($x) = Strings::unpackSSH2('i', $private);
return compact('p', 'q', 'g', 'y', 'x', 'comment');
}
/**
* Convert a private key to the appropriate format.
*
* @access public
* @param \phpseclib3\Math\BigInteger $p
* @param \phpseclib3\Math\BigInteger $q
* @param \phpseclib3\Math\BigInteger $g
* @param \phpseclib3\Math\BigInteger $y
* @param \phpseclib3\Math\BigInteger $x
* @param string $password optional
* @param array $options optional
* @return string
*/
public static function savePrivateKey(BigInteger $p, BigInteger $q, BigInteger $g, BigInteger $y, BigInteger $x, $password = false, array $options = [])
{
if ($q->getLength() != 160) {
throw new \InvalidArgumentException('SSH only supports keys with an N (length of Group Order q) of 160');
}
$public = Strings::packSSH2('iiii', $p, $q, $g, $y);
$private = Strings::packSSH2('i', $x);
return self::wrapPrivateKey($public, $private, 'ssh-dsa', $password, $options);
}
/**
* Convert a public key to the appropriate format
*
* @access public
* @param \phpseclib3\Math\BigInteger $p
* @param \phpseclib3\Math\BigInteger $q
* @param \phpseclib3\Math\BigInteger $g
* @param \phpseclib3\Math\BigInteger $y
* @return string
*/
public static function savePublicKey(BigInteger $p, BigInteger $q, BigInteger $g, BigInteger $y)
{
if ($q->getLength() != 160) {
throw new \InvalidArgumentException('SSH only supports keys with an N (length of Group Order q) of 160');
}
return self::wrapPublicKey(Strings::packSSH2('iiii', $p, $q, $g, $y), 'ssh-dsa');
}
}
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