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<?php
/**
* Montgomery Public Key Handler
*
* PHP version 5
*
* @category Crypt
* @package EC
* @author Jim Wigginton <terrafrost@php.net>
* @copyright 2015 Jim Wigginton
* @license http://www.opensource.org/licenses/mit-license.html MIT License
* @link http://phpseclib.sourceforge.net
*/
namespace phpseclib3\Crypt\EC\Formats\Keys;
use phpseclib3\Crypt\EC\Curves\Curve25519;
use phpseclib3\Crypt\EC\Curves\Curve448;
use phpseclib3\Crypt\EC\BaseCurves\Montgomery as MontgomeryCurve;
use phpseclib3\Math\Common\FiniteField\Integer;
use phpseclib3\Math\BigInteger;
/**
* Montgomery Public Key Handler
*
* @package EC
* @author Jim Wigginton <terrafrost@php.net>
* @access public
*/
abstract class MontgomeryPublic
{
/**
* Is invisible flag
*
* @access private
*/
const IS_INVISIBLE = true;
/**
* Break a public or private key down into its constituent components
*
* @access public
* @param string $key
* @param string $password optional
* @return array
*/
public static function load($key, $password = '')
{
switch (strlen($key)) {
case 32:
$curve = new Curve25519;
break;
case 56:
$curve = new Curve448;
break;
default:
throw new \LengthException('The only supported lengths are 32 and 56');
}
$components = ['curve' => $curve];
$components['QA'] = [$components['curve']->convertInteger(new BigInteger(strrev($key), 256))];
return $components;
}
/**
* Convert an EC public key to the appropriate format
*
* @access public
* @param \phpseclib3\Crypt\EC\BaseCurves\Montgomery $curve
* @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey
* @return string
*/
public static function savePublicKey(MontgomeryCurve $curve, array $publicKey)
{
return strrev($publicKey[0]->toBytes());
}
}
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