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<?php
/**
* libsodium Key Handler
*
* Different NaCl implementations store the key differently.
* https://blog.mozilla.org/warner/2011/11/29/ed25519-keys/ elaborates.
* libsodium appears to use the same format as SUPERCOP.
*
* 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\Ed25519;
use phpseclib3\Math\Common\FiniteField\Integer;
use phpseclib3\Exception\UnsupportedFormatException;
/**
* libsodium Key Handler
*
* @package EC
* @author Jim Wigginton <terrafrost@php.net>
* @access public
*/
abstract class libsodium
{
use Common;
/**
* 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:
$public = $key;
break;
case 64:
$private = substr($key, 0, 32);
$public = substr($key, -32);
break;
case 96:
$public = substr($key, -32);
if (substr($key, 32, 32) != $public) {
throw new \RuntimeException('Keys with 96 bytes should have the 2nd and 3rd set of 32 bytes match');
}
$private = substr($key, 0, 32);
break;
default:
throw new \RuntimeException('libsodium keys need to either be 32 bytes long, 64 bytes long or 96 bytes long');
}
$curve = new Ed25519();
$components = ['curve' => $curve];
if (isset($private)) {
$components['dA'] = $curve->extractSecret($private);
}
$components['QA'] = isset($public) ?
self::extractPoint($public, $curve) :
$curve->multiplyPoint($curve->getBasePoint(), $components['dA']);
return $components;
}
/**
* Convert an EC public key to the appropriate format
*
* @access public
* @param \phpseclib3\Crypt\EC\Curves\Ed25519 $curve
* @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey
* @return string
*/
public static function savePublicKey(Ed25519 $curve, array $publicKey)
{
return $curve->encodePoint($publicKey);
}
/**
* Convert a private key to the appropriate format.
*
* @access public
* @param \phpseclib3\Math\Common\FiniteField\Integer $privateKey
* @param \phpseclib3\Crypt\EC\Curves\Ed25519 $curve
* @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey
* @param string $password optional
* @return string
*/
public static function savePrivateKey(Integer $privateKey, Ed25519 $curve, array $publicKey, $password = '')
{
if (!isset($privateKey->secret)) {
throw new \RuntimeException('Private Key does not have a secret set');
}
if (strlen($privateKey->secret) != 32) {
throw new \RuntimeException('Private Key secret is not of the correct length');
}
if (!empty($password) && is_string($password)) {
throw new UnsupportedFormatException('libsodium private keys do not support encryption');
}
return $privateKey->secret . $curve->encodePoint($publicKey);
}
}
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