67 lines
1.5 KiB
PHP
67 lines
1.5 KiB
PHP
<?php
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/**
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* IEEE P1363 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://standards.ieee.org/ieee/1363/2049/ and
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* https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/sign#ecdsa
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*
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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\Math\BigInteger;
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/**
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* ASN1 Signature Handler
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*
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* @author Jim Wigginton <terrafrost@php.net>
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*/
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abstract class IEEE
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{
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/**
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* Loads a signature
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*
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* @param string $sig
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* @return array
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*/
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public static function load($sig)
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{
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if (!is_string($sig)) {
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return false;
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}
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$len = strlen($sig);
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if ($len & 1) {
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return false;
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}
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$r = new BigInteger(substr($sig, 0, $len >> 1), 256);
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$s = new BigInteger(substr($sig, $len >> 1), 256);
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return compact('r', 's');
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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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* @param \phpseclib3\Math\BigInteger $r
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* @param \phpseclib3\Math\BigInteger $s
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* @return string
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*/
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public static function save(BigInteger $r, BigInteger $s)
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{
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$r = $r->toBytes();
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$s = $s->toBytes();
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$len = max(strlen($r), strlen($s));
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return str_pad($r, $len, "\0", STR_PAD_LEFT) . str_pad($s, $len, "\0", STR_PAD_LEFT);
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}
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}
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