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<?php
/**
* PuTTY Formatted EC Key Handler
*
* PHP version 5
*
* @category Crypt
* @package EC
* @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\EC\Formats\Keys;
use ParagonIE\ConstantTime\Base64;
use phpseclib3\Math\BigInteger;
use phpseclib3\Common\Functions\Strings;
use phpseclib3\Crypt\Common\Formats\Keys\PuTTY as Progenitor;
use phpseclib3\Crypt\EC\BaseCurves\Base as BaseCurve;
use phpseclib3\Math\Common\FiniteField\Integer;
use phpseclib3\Crypt\EC\BaseCurves\TwistedEdwards as TwistedEdwardsCurve;
/**
* PuTTY Formatted EC Key Handler
*
* @package EC
* @author Jim Wigginton <terrafrost@php.net>
* @access public
*/
abstract class PuTTY extends Progenitor
{
use Common;
/**
* Public Handler
*
* @var string
* @access private
*/
const PUBLIC_HANDLER = 'phpseclib3\Crypt\EC\Formats\Keys\OpenSSH';
/**
* Supported Key Types
*
* @var array
* @access private
*/
protected static $types = [
'ecdsa-sha2-nistp256',
'ecdsa-sha2-nistp384',
'ecdsa-sha2-nistp521',
'ssh-ed25519'
];
/**
* 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;
}
$private = $components['private'];
$temp = Base64::encode(Strings::packSSH2('s', $components['type']) . $components['public']);
$components = OpenSSH::load($components['type'] . ' ' . $temp . ' ' . $components['comment']);
if ($components['curve'] instanceof TwistedEdwardsCurve) {
if (Strings::shift($private, 4) != "\0\0\0\x20") {
throw new \RuntimeException('Length of ssh-ed25519 key should be 32');
}
$components['dA'] = $components['curve']->extractSecret($private);
} else {
list($temp) = Strings::unpackSSH2('i', $private);
$components['dA'] = $components['curve']->convertInteger($temp);
}
return $components;
}
/**
* Convert a private key to the appropriate format.
*
* @access public
* @param \phpseclib3\Math\Common\FiniteField\Integer $privateKey
* @param \phpseclib3\Crypt\EC\BaseCurves\Base $curve
* @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey
* @param string $password optional
* @param array $options optional
* @return string
*/
public static function savePrivateKey(Integer $privateKey, BaseCurve $curve, array $publicKey, $password = false, array $options = [])
{
self::initialize_static_variables();
$public = explode(' ', OpenSSH::savePublicKey($curve, $publicKey));
$name = $public[0];
$public = Base64::decode($public[1]);
list(, $length) = unpack('N', Strings::shift($public, 4));
Strings::shift($public, $length);
// PuTTY pads private keys with a null byte per the following:
// https://github.com/github/putty/blob/a3d14d77f566a41fc61dfdc5c2e0e384c9e6ae8b/sshecc.c#L1926
if (!$curve instanceof TwistedEdwardsCurve) {
$private = $privateKey->toBytes();
if (!(strlen($privateKey->toBits()) & 7)) {
$private ="\0$private";
}
}
$private = $curve instanceof TwistedEdwardsCurve ?
Strings::packSSH2('s', $privateKey->secret) :
Strings::packSSH2('s', $private);
return self::wrapPrivateKey($public, $private, $name, $password, $options);
}
/**
* Convert an EC public key to the appropriate format
*
* @access public
* @param \phpseclib3\Crypt\EC\BaseCurves\Base $curve
* @param \phpseclib3\Math\Common\FiniteField[] $publicKey
* @return string
*/
public static function savePublicKey(BaseCurve $curve, array $publicKey)
{
$public = explode(' ', OpenSSH::savePublicKey($curve, $publicKey));
$type = $public[0];
$public = Base64::decode($public[1]);
list(, $length) = unpack('N', Strings::shift($public, 4));
Strings::shift($public, $length);
return self::wrapPublicKey($public, $type);
}
}
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