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<?php
/**
* PuTTY Formatted RSA Key Handler
*
* PHP version 5
*
* @category Crypt
* @package RSA
* @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\RSA\Formats\Keys;
use phpseclib3\Math\BigInteger;
use phpseclib3\Common\Functions\Strings;
use phpseclib3\Crypt\Common\Formats\Keys\PuTTY as Progenitor;
/**
* PuTTY Formatted RSA Key Handler
*
* @package RSA
* @author Jim Wigginton <terrafrost@php.net>
* @access public
*/
abstract class PuTTY extends Progenitor
{
/**
* Public Handler
*
* @var string
* @access private
*/
const PUBLIC_HANDLER = 'phpseclib3\Crypt\RSA\Formats\Keys\OpenSSH';
/**
* Algorithm Identifier
*
* @var array
* @access private
*/
protected static $types = ['ssh-rsa'];
/**
* 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 = '')
{
static $one;
if (!isset($one)) {
$one = new BigInteger(1);
}
$components = parent::load($key, $password);
if (!isset($components['private'])) {
return $components;
}
extract($components);
unset($components['public'], $components['private']);
$isPublicKey = false;
$result = Strings::unpackSSH2('ii', $public);
if ($result === false) {
throw new \UnexpectedValueException('Key appears to be malformed');
}
list($publicExponent, $modulus) = $result;
$result = Strings::unpackSSH2('iiii', $private);
if ($result === false) {
throw new \UnexpectedValueException('Key appears to be malformed');
}
$primes = $coefficients = [];
list($privateExponent, $primes[1], $primes[2], $coefficients[2]) = $result;
$temp = $primes[1]->subtract($one);
$exponents = [1 => $publicExponent->modInverse($temp)];
$temp = $primes[2]->subtract($one);
$exponents[] = $publicExponent->modInverse($temp);
return compact('publicExponent', 'modulus', 'privateExponent', 'primes', 'coefficients', 'exponents', 'comment', 'isPublicKey');
}
/**
* Convert a private key to the appropriate format.
*
* @access public
* @param \phpseclib3\Math\BigInteger $n
* @param \phpseclib3\Math\BigInteger $e
* @param \phpseclib3\Math\BigInteger $d
* @param array $primes
* @param array $exponents
* @param array $coefficients
* @param string $password optional
* @param array $options optional
* @return string
*/
public static function savePrivateKey(BigInteger $n, BigInteger $e, BigInteger $d, array $primes, array $exponents, array $coefficients, $password = '', array $options = [])
{
if (count($primes) != 2) {
throw new \InvalidArgumentException('PuTTY does not support multi-prime RSA keys');
}
$public = Strings::packSSH2('ii', $e, $n);
$private = Strings::packSSH2('iiii', $d, $primes[1], $primes[2], $coefficients[2]);
return self::wrapPrivateKey($public, $private, 'ssh-rsa', $password, $options);
}
/**
* Convert a public key to the appropriate format
*
* @access public
* @param \phpseclib3\Math\BigInteger $n
* @param \phpseclib3\Math\BigInteger $e
* @return string
*/
public static function savePublicKey(BigInteger $n, BigInteger $e)
{
return self::wrapPublicKey(Strings::packSSH2('ii', $e, $n), 'ssh-rsa');
}
}