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Current File : /home/builderbox/www/vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Signature/SSH2.php
<?php

/**
 * SSH2 Signature Handler
 *
 * PHP version 5
 *
 * Handles signatures in the format used by SSH2
 *
 * @category  Crypt
 * @package   Common
 * @author    Jim Wigginton <terrafrost@php.net>
 * @copyright 2016 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

namespace phpseclib3\Crypt\DSA\Formats\Signature;

use phpseclib3\Math\BigInteger;
use phpseclib3\Common\Functions\Strings;

/**
 * SSH2 Signature Handler
 *
 * @package Common
 * @author  Jim Wigginton <terrafrost@php.net>
 * @access  public
 */
abstract class SSH2
{
    /**
     * Loads a signature
     *
     * @access public
     * @param string $sig
     * @return mixed
     */
    public static function load($sig)
    {
        if (!is_string($sig)) {
            return false;
        }

        $result = Strings::unpackSSH2('ss', $sig);
        if ($result === false) {
            return false;
        }
        list($type, $blob) = $result;
        if ($type != 'ssh-dss' || strlen($blob) != 40) {
            return false;
        }

        return [
            'r' => new BigInteger(substr($blob, 0, 20), 256),
            's' => new BigInteger(substr($blob, 20), 256)
        ];
    }

    /**
     * Returns a signature in the appropriate format
     *
     * @access public
     * @param \phpseclib3\Math\BigInteger $r
     * @param \phpseclib3\Math\BigInteger $s
     * @return string
     */
    public static function save(BigInteger $r, BigInteger $s)
    {
        if ($r->getLength() > 160 || $s->getLength() > 160) {
            return false;
        }
        return Strings::packSSH2('ss', 'ssh-dss',
            str_pad($r->toBytes(), 20, "\0", STR_PAD_LEFT) .
            str_pad($s->toBytes(), 20, "\0", STR_PAD_LEFT)
        );
    }
}

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