Subversion Repositories oidplus

<?php

/**

 * OpenSSH Formatted EC Key Handler

 *

 * PHP version 5

 *

 * Place in $HOME/.ssh/authorized_keys

 *

 * @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 phpseclib3\Common\Functions\Strings;

use phpseclib3\Crypt\Common\Formats\Keys\OpenSSH as Progenitor;

use phpseclib3\Crypt\EC\BaseCurves\Base as BaseCurve;

use phpseclib3\Crypt\EC\Curves\Ed25519;

use phpseclib3\Exception\UnsupportedCurveException;

use phpseclib3\Math\BigInteger;

/**

 * OpenSSH Formatted EC Key Handler

 *

 * @author  Jim Wigginton <terrafrost@php.net>

 */

abstract class OpenSSH extends Progenitor

{

    use Common;

    /**

     * Supported Key Types

     *

     * @var array

     */

    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

     *

     * @param string $key

     * @param string $password optional

     * @return array

     */

    public static function load($key, $password = '')

    {

        $parsed = parent::load($key, $password);

        if (isset($parsed['paddedKey'])) {

            $paddedKey = $parsed['paddedKey'];

            list($type) = Strings::unpackSSH2('s', $paddedKey);

            if ($type != $parsed['type']) {

                throw new \RuntimeException("The public and private keys are not of the same type ($type vs $parsed[type])");

            }

            if ($type == 'ssh-ed25519') {

                list(, $key, $comment) = Strings::unpackSSH2('sss', $paddedKey);

                $key = libsodium::load($key);

                $key['comment'] = $comment;

                return $key;

            }

            list($curveName, $publicKey, $privateKey, $comment) = Strings::unpackSSH2('ssis', $paddedKey);

            $curve = self::loadCurveByParam(['namedCurve' => $curveName]);

            $curve->rangeCheck($privateKey);

            return [

                'curve' => $curve,

                'dA' => $privateKey,

                'QA' => self::extractPoint("\0$publicKey", $curve),

                'comment' => $comment

            ];

        }

        if ($parsed['type'] == 'ssh-ed25519') {

            if (Strings::shift($parsed['publicKey'], 4) != "\0\0\0\x20") {

                throw new \RuntimeException('Length of ssh-ed25519 key should be 32');

            }

            $curve = new Ed25519();

            $qa = self::extractPoint($parsed['publicKey'], $curve);

        } else {

            list($curveName, $publicKey) = Strings::unpackSSH2('ss', $parsed['publicKey']);

            $curveName = '\phpseclib3\Crypt\EC\Curves\\' . $curveName;

            $curve = new $curveName();

            $qa = self::extractPoint("\0" . $publicKey, $curve);

        }

        return [

            'curve' => $curve,

            'QA' => $qa,

            'comment' => $parsed['comment']

        ];

    }

    /**

     * Returns the alias that corresponds to a curve

     *

     * @return string

     */

    private static function getAlias(BaseCurve $curve)

    {

        self::initialize_static_variables();

        $reflect = new \ReflectionClass($curve);

        $name = $reflect->getShortName();

        $oid = self::$curveOIDs[$name];

        $aliases = array_filter(self::$curveOIDs, function ($v) use ($oid) {

            return $v == $oid;

        });

        $aliases = array_keys($aliases);

        for ($i = 0; $i < count($aliases); $i++) {

            if (in_array('ecdsa-sha2-' . $aliases[$i], self::$types)) {

                $alias = $aliases[$i];

                break;

            }

        }

        if (!isset($alias)) {

            throw new UnsupportedCurveException($name . ' is not a curve that the OpenSSH plugin supports');

        }

        return $alias;

    }

    /**

     * Convert an EC public key to the appropriate format

     *

     * @param \phpseclib3\Crypt\EC\BaseCurves\Base $curve

     * @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey

     * @param array $options optional

     * @return string

     */

    public static function savePublicKey(BaseCurve $curve, array $publicKey, array $options = [])

    {

        $comment = isset($options['comment']) ? $options['comment'] : self::$comment;

        if ($curve instanceof Ed25519) {

            $key = Strings::packSSH2('ss', 'ssh-ed25519', $curve->encodePoint($publicKey));

            if (isset($options['binary']) ? $options['binary'] : self::$binary) {

                return $key;

            }

            $key = 'ssh-ed25519 ' . base64_encode($key) . ' ' . $comment;

            return $key;

        }

        $alias = self::getAlias($curve);

        $points = "\4" . $publicKey[0]->toBytes() . $publicKey[1]->toBytes();

        $key = Strings::packSSH2('sss', 'ecdsa-sha2-' . $alias, $alias, $points);

        if (isset($options['binary']) ? $options['binary'] : self::$binary) {

            return $key;

        }

        $key = 'ecdsa-sha2-' . $alias . ' ' . base64_encode($key) . ' ' . $comment;

        return $key;

    }

    /**

     * Convert a private key to the appropriate format.

     *

     * @param \phpseclib3\Math\BigInteger $privateKey

     * @param \phpseclib3\Crypt\EC\Curves\Ed25519 $curve

     * @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey

     * @param string $secret optional

     * @param string $password optional

     * @param array $options optional

     * @return string

     */

    public static function savePrivateKey(BigInteger $privateKey, BaseCurve $curve, array $publicKey, $secret = null, $password = '', array $options = [])

    {

        if ($curve instanceof Ed25519) {

            if (!isset($secret)) {

                throw new \RuntimeException('Private Key does not have a secret set');

            }

            if (strlen($secret) != 32) {

                throw new \RuntimeException('Private Key secret is not of the correct length');

            }

            $pubKey = $curve->encodePoint($publicKey);

            $publicKey = Strings::packSSH2('ss', 'ssh-ed25519', $pubKey);

            $privateKey = Strings::packSSH2('sss', 'ssh-ed25519', $pubKey, $secret . $pubKey);

            return self::wrapPrivateKey($publicKey, $privateKey, $password, $options);

        }

        $alias = self::getAlias($curve);

        $points = "\4" . $publicKey[0]->toBytes() . $publicKey[1]->toBytes();

        $publicKey = self::savePublicKey($curve, $publicKey, ['binary' => true]);

        $privateKey = Strings::packSSH2('sssi', 'ecdsa-sha2-' . $alias, $alias, $points, $privateKey);

        return self::wrapPrivateKey($publicKey, $privateKey, $password, $options);

    }

}