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69 lines
1.5 KiB
PHP
69 lines
1.5 KiB
PHP
<?php
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/**
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* PKCS Signature Handler
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*
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* PHP version 5
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*
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* Handles signatures in the format described in
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* https://tools.ietf.org/html/rfc3279#section-2.2.2
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*
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* @category Crypt
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* @package Common
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* @author Jim Wigginton <terrafrost@php.net>
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* @copyright 2016 Jim Wigginton
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* @license http://www.opensource.org/licenses/mit-license.html MIT License
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* @link http://phpseclib.sourceforge.net
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*/
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namespace phpseclib\Crypt\DSA\Signature;
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use phpseclib\Math\BigInteger;
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use phpseclib\File\ASN1;
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use phpseclib\File\ASN1\Maps;
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/**
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* PKCS Signature Handler
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*
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* @package Common
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* @author Jim Wigginton <terrafrost@php.net>
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* @access public
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*/
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abstract class PKCS
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{
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/**
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* Loads a signature
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*
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* @access public
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* @param array $key
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* @return array|bool
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*/
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public static function load($sig)
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{
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if (!is_string($sig)) {
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return false;
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}
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$decoded = ASN1::decodeBER($sig);
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if (empty($decoded)) {
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return false;
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}
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$components = ASN1::asn1map($decoded[0], Maps\DssSigValue::MAP);
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return $components;
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}
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/**
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* Returns a signature in the appropriate format
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*
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* @access public
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* @param \phpseclib\Math\BigInteger $r
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* @param \phpseclib\Math\BigInteger $s
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* @return string
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*/
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public static function save(BigInteger $r, BigInteger $s)
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{
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return ASN1::encodeDER(compact('r', 's'), Maps\DssSigValue::MAP);
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}
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}
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