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112 lines
3.4 KiB
PHP
112 lines
3.4 KiB
PHP
<?php
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/**
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* libsodium Key Handler
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*
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* Different NaCl implementations store the key differently.
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* https://blog.mozilla.org/warner/2011/11/29/ed25519-keys/ elaborates.
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* libsodium appears to use the same format as SUPERCOP.
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*
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* PHP version 5
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*
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* @category Crypt
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* @package ECDSA
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* @author Jim Wigginton <terrafrost@php.net>
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* @copyright 2015 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 phpseclib\Crypt\ECDSA\Formats\Keys;
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use phpseclib\Crypt\ECDSA\Curves\Ed25519;
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use phpseclib\Math\Common\FiniteField\Integer;
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/**
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* libsodium Key Handler
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*
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* @package ECDSA
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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 libsodium
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{
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use Common;
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/**
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* Break a public or private key down into its constituent components
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*
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* @access public
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* @param string $key
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* @param string $password optional
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* @return array
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*/
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public static function load($key, $password = '')
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{
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switch (strlen($key)) {
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case 32:
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$public = $key;
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break;
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case 64:
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$private = substr($key, 0, 32);
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$public = substr($key, -32);
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break;
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case 96:
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$public = substr($key, -32);
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if (substr($key, 32, 32) != $public) {
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throw new \RuntimeException('Keys with 96 bytes should have the 2nd and 3rd set of 32 bytes match');
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}
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$private = substr($key, 0, 32);
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break;
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default:
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throw new \RuntimeException('libsodium keys need to either be 32 bytes long, 64 bytes long or 96 bytes long');
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}
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$curve = new Ed25519();
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$components = ['curve' => $curve];
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if (isset($private)) {
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$components['dA'] = $curve->extractSecret($private);
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}
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$components['QA'] = isset($public) ?
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self::extractPoint($public, $curve) :
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$curve->multiplyPoint($curve->getBasePoint(), $components['dA']);
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return $components;
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}
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/**
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* Convert an ECDSA public key to the appropriate format
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*
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* @access public
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* @param \phpseclib\Crypt\ECDSA\Curves\Ed25519 $curve
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* @param \phpseclib\Math\Common\FiniteField\Integer[] $publicKey
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* @return string
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*/
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public static function savePublicKey(Ed25519 $curve, array $publicKey)
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{
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return $curve->encodePoint($publicKey);
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}
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/**
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* Convert a private key to the appropriate format.
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*
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* @access public
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* @param \phpseclib\Math\Common\FiniteField\Integer $privateKey
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* @param \phpseclib\Crypt\ECDSA\Curves\Ed25519 $curve
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* @param \phpseclib\Math\Common\FiniteField\Integer[] $publicKey
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* @param string $password optional
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* @return string
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*/
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public static function savePrivateKey(Integer $privateKey, Ed25519 $curve, array $publicKey, $password = '')
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{
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if (!isset($privateKey->secret)) {
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throw new \RuntimeException('Private Key does not have a secret set');
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}
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if (strlen($privateKey->secret) != 32) {
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throw new \RuntimeException('Private Key secret is not of the correct length');
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}
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return $privateKey->secret . $curve->encodePoint($publicKey);
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}
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}
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