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https://github.com/phpseclib/phpseclib.git
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101 lines
2.3 KiB
PHP
101 lines
2.3 KiB
PHP
<?php
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/**
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* SSH2 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 used by SSH2
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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 phpseclib3\Crypt\EC\Formats\Signature;
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use phpseclib3\Common\Functions\Strings;
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use phpseclib3\Math\BigInteger;
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/**
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* SSH2 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 SSH2
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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 string $sig
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* @return mixed
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*/
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public static function load($sig)
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{
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if (!is_string($sig)) {
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return false;
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}
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$result = Strings::unpackSSH2('ss', $sig);
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if ($result === false) {
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return false;
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}
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list($type, $blob) = $result;
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switch ($type) {
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// see https://tools.ietf.org/html/rfc5656#section-3.1.2
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case 'ecdsa-sha2-nistp256':
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case 'ecdsa-sha2-nistp384':
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case 'ecdsa-sha2-nistp521':
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break;
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default:
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return false;
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}
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$result = Strings::unpackSSH2('ii', $blob);
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if ($result === false) {
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return false;
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}
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return [
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'r' => $result[0],
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's' => $result[1]
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];
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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 \phpseclib3\Math\BigInteger $r
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* @param \phpseclib3\Math\BigInteger $s
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* @param string $curve
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* @return string
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*/
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public static function save(BigInteger $r, BigInteger $s, $curve)
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{
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switch ($curve) {
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case 'secp256r1':
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$curve = 'nistp256';
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break;
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case 'secp384r1':
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$curve = 'nistp384';
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break;
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case 'secp521r1':
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$curve = 'nistp521';
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break;
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default:
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return false;
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}
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$blob = Strings::packSSH2('ii', $r, $s);
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return Strings::packSSH2('ss', 'ecdsa-sha2-' . $curve, $blob);
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}
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}
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