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<?php
/**
* ASN1 Signature Handler
*
* PHP version 5
*
* Handles signatures in the format described in
* https://tools.ietf.org/html/rfc3279#section-2.2.2
*
* @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\File\ASN1 as Encoder;
use phpseclib3\File\ASN1\Maps;
/**
* ASN1 Signature Handler
*
* @package Common
* @author Jim Wigginton <terrafrost@php.net>
* @access public
*/
abstract class ASN1
{
/**
* Loads a signature
*
* @access public
* @param string $sig
* @return array|bool
*/
public static function load($sig)
{
if (!is_string($sig)) {
return false;
}
$decoded = Encoder::decodeBER($sig);
if (empty($decoded)) {
return false;
}
$components = Encoder::asn1map($decoded[0], Maps\DssSigValue::MAP);
return $components;
}
/**
* 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)
{
return Encoder::encodeDER(compact('r', 's'), Maps\DssSigValue::MAP);
}
}