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<?php
/**
* IEEE P1363 Signature Handler
*
* PHP version 5
*
* Handles signatures in the format described in
* https://standards.ieee.org/ieee/1363/2049/ and
* https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/sign#ecdsa
*
* @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\EC\Formats\Signature;
use phpseclib3\Math\BigInteger;
/**
* ASN1 Signature Handler
*
* @author Jim Wigginton <terrafrost@php.net>
*/
abstract class IEEE
{
/**
* Loads a signature
*
* @param string $sig
* @return array
*/
public static function load($sig)
{
if (!is_string($sig)) {
return false;
}
$len = strlen($sig);
if ($len & 1) {
return false;
}
$r = new BigInteger(substr($sig, 0, $len >> 1), 256);
$s = new BigInteger(substr($sig, $len >> 1), 256);
return compact('r', 's');
}
/**
* Returns a signature in the appropriate format
*
* @param BigInteger $r
* @param BigInteger $s
* @param string $curve
* @param int $length
* @return string
*/
public static function save(BigInteger $r, BigInteger $s, $curve, $length)
{
$r = $r->toBytes();
$s = $s->toBytes();
$length = (int) ceil($length / 8);
return str_pad($r, $length, "\0", STR_PAD_LEFT) . str_pad($s, $length, "\0", STR_PAD_LEFT);
}
}
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