100 lines
3.0 KiB
PHP
100 lines
3.0 KiB
PHP
<?php
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/**
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* PuTTY Formatted DSA Key Handler
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*
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* puttygen does not generate DSA keys with an N of anything other than 160, however,
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* it can still load them and convert them. PuTTY will load them, too, but SSH servers
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* won't accept them. Since PuTTY formatted keys are primarily used with SSH this makes
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* keys with N > 160 kinda useless, hence this handlers not supporting such keys.
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*
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* PHP version 5
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*
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* @author Jim Wigginton <terrafrost@php.net>
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* @copyright 2015 Jim Wigginton
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* @license http://www.opensource.org/licenses/mit-license.html MIT License
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* @link http://phpseclib.sourceforge.net
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*/
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declare(strict_types=1);
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namespace phpseclib3\Crypt\DSA\Formats\Keys;
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use phpseclib3\Common\Functions\Strings;
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use phpseclib3\Crypt\Common\Formats\Keys\PuTTY as Progenitor;
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use phpseclib3\Math\BigInteger;
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/**
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* PuTTY Formatted DSA Key Handler
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*
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* @author Jim Wigginton <terrafrost@php.net>
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*/
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abstract class PuTTY extends Progenitor
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{
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/**
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* Public Handler
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*
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* @var string
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*/
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const PUBLIC_HANDLER = 'phpseclib3\Crypt\DSA\Formats\Keys\OpenSSH';
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/**
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* Algorithm Identifier
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*
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* @var array
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*/
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protected static $types = ['ssh-dss'];
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/**
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* Break a public or private key down into its constituent components
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*
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* @param array|string $key
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* @param string|false $password
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* @return array|false
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*/
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public static function load($key, $password)
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{
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$components = parent::load($key, $password);
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if (!isset($components['private'])) {
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return $components;
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}
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extract($components);
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unset($components['public'], $components['private']);
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[$p, $q, $g, $y] = Strings::unpackSSH2('iiii', $public);
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[$x] = Strings::unpackSSH2('i', $private);
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return compact('p', 'q', 'g', 'y', 'x', 'comment');
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}
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/**
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* Convert a private key to the appropriate format.
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*
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* @param string $password optional
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* @param array $options optional
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*/
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public static function savePrivateKey(BigInteger $p, BigInteger $q, BigInteger $g, BigInteger $y, BigInteger $x, $password = false, array $options = []): string
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{
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if ($q->getLength() != 160) {
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throw new \InvalidArgumentException('SSH only supports keys with an N (length of Group Order q) of 160');
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}
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$public = Strings::packSSH2('iiii', $p, $q, $g, $y);
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$private = Strings::packSSH2('i', $x);
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return self::wrapPrivateKey($public, $private, 'ssh-dsa', $password, $options);
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}
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/**
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* Convert a public key to the appropriate format
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*/
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public static function savePublicKey(BigInteger $p, BigInteger $q, BigInteger $g, BigInteger $y): string
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{
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if ($q->getLength() != 160) {
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throw new \InvalidArgumentException('SSH only supports keys with an N (length of Group Order q) of 160');
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}
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return self::wrapPublicKey(Strings::packSSH2('iiii', $p, $q, $g, $y), 'ssh-dsa');
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}
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}
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