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<?php
/**
* OpenSSH Formatted RSA Key Handler
*
* PHP version 5
*
* Place in $HOME/.ssh/authorized_keys
*
* @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 ParagonIE\ConstantTime\Base64;
use phpseclib3\Math\BigInteger;
use phpseclib3\Common\Functions\Strings;
use phpseclib3\Crypt\Common\Formats\Keys\OpenSSH as Progenitor;
/**
* OpenSSH Formatted RSA Key Handler
*
* @package RSA
* @author Jim Wigginton <terrafrost@php.net>
* @access public
*/
abstract class OpenSSH extends Progenitor
{
/**
* Supported Key Types
*
* @var array
*/
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);
}
$parsed = parent::load($key, $password);
if (isset($parsed['paddedKey'])) {
list($type) = Strings::unpackSSH2('s', $parsed['paddedKey']);
if ($type != $parsed['type']) {
throw new \RuntimeException("The public and private keys are not of the same type ($type vs $parsed[type])");
}
$primes = $coefficients = [];
list(
$modulus,
$publicExponent,
$privateExponent,
$coefficients[2],
$primes[1],
$primes[2],
$comment,
) = Strings::unpackSSH2('i6s', $parsed['paddedKey']);
$temp = $primes[1]->subtract($one);
$exponents = [1 => $publicExponent->modInverse($temp)];
$temp = $primes[2]->subtract($one);
$exponents[] = $publicExponent->modInverse($temp);
$isPublicKey = false;
return compact('publicExponent', 'modulus', 'privateExponent', 'primes', 'coefficients', 'exponents', 'comment', 'isPublicKey');
}
list($publicExponent, $modulus) = Strings::unpackSSH2('ii', $parsed['publicKey']);
return [
'isPublicKey' => true,
'modulus' => $modulus,
'publicExponent' => $publicExponent,
'comment' => $parsed['comment']
];
}
/**
* Convert a public key to the appropriate format
*
* @access public
* @param \phpseclib3\Math\BigInteger $n
* @param \phpseclib3\Math\BigInteger $e
* @param array $options optional
* @return string
*/
public static function savePublicKey(BigInteger $n, BigInteger $e, array $options = [])
{
$RSAPublicKey = Strings::packSSH2('sii', 'ssh-rsa', $e, $n);
if (isset($options['binary']) ? $options['binary'] : self::$binary) {
return $RSAPublicKey;
}
$comment = isset($options['comment']) ? $options['comment'] : self::$comment;
$RSAPublicKey = 'ssh-rsa ' . base64_encode($RSAPublicKey) . ' ' . $comment;
return $RSAPublicKey;
}
/**
* 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 = [])
{
$publicKey = self::savePublicKey($n, $e, ['binary' => true]);
$privateKey = Strings::packSSH2('si6', 'ssh-rsa', $n, $e, $d, $coefficients[2], $primes[1], $primes[2]);
return self::wrapPrivateKey($publicKey, $privateKey, $password, $options);
}
}
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