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tgseclib/phpseclib/Crypt/DSA/Keys/OpenSSH.php

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2016-12-23 17:02:07 +01:00
<?php
/**
* OpenSSH Formatted DSA Key Handler
*
* PHP version 5
*
* Place in $HOME/.ssh/authorized_keys
*
* @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 phpseclib\Crypt\DSA\Keys;
use ParagonIE\ConstantTime\Base64;
use phpseclib\Math\BigInteger;
use phpseclib\Common\Functions\Strings;
use phpseclib\Crypt\Common\Keys\OpenSSH as Progenitor;
/**
* OpenSSH Formatted DSA Key Handler
*
* @package DSA
* @author Jim Wigginton <terrafrost@php.net>
* @access public
*/
abstract class OpenSSH extends Progenitor
{
/**
* Break a public or private key down into its constituent components
*
* @access public
* @param string $key
* @param string $password optional
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* @return array|bool
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*/
public static function load($key, $password = '')
{
$key = parent::load($key, 'ssh-dss');
if ($key === false) {
return false;
}
$result = Strings::unpackSSH2('iiii', $key);
if ($result === false) {
return false;
}
list($p, $q, $g, $y) = $result;
$comment = parent::getComment($key);
return compact('p', 'q', 'g', 'y', 'comment');
}
/**
* Convert a public key to the appropriate format
*
* @access public
* @param \phpseclib\Math\BigInteger $p
* @param \phpseclib\Math\BigInteger $q
* @param \phpseclib\Math\BigInteger $g
* @param \phpseclib\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');
}
// from <http://tools.ietf.org/html/rfc4253#page-15>:
// string "ssh-dss"
// mpint p
// mpint q
// mpint g
// mpint y
$DSAPublicKey = Strings::packSSH2('siiii', 'ssh-dss', $p, $q, $g, $y);
if (self::$binary) {
return $DSAPublicKey;
}
$DSAPublicKey = 'ssh-dss ' . Base64::encode($DSAPublicKey) . ' ' . self::$comment;
return $DSAPublicKey;
}
}