94 lines
2.9 KiB
PHP
94 lines
2.9 KiB
PHP
<?php
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/**
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* Montgomery Private Key Handler
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*
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* "Naked" Curve25519 private keys can pretty much be any sequence of random 32x bytes so unless
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* we have a "hidden" key handler pretty much every 32 byte string will be loaded as a curve25519
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* private key even if it probably isn't one by PublicKeyLoader.
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*
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* "Naked" Curve25519 public keys also a string of 32 bytes so distinguishing between a "naked"
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* curve25519 private key and a public key is nigh impossible, hence separate plugins for each
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*
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* PHP version 5
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*
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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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declare(strict_types=1);
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namespace phpseclib3\Crypt\EC\Formats\Keys;
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use phpseclib3\Crypt\EC\BaseCurves\Montgomery as MontgomeryCurve;
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use phpseclib3\Crypt\EC\Curves\Curve25519;
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use phpseclib3\Crypt\EC\Curves\Curve448;
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use phpseclib3\Exception\LengthException;
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use phpseclib3\Exception\UnsupportedFormatException;
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use phpseclib3\Math\BigInteger;
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use phpseclib3\Math\Common\FiniteField\Integer;
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/**
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* Montgomery Curve Private Key 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 MontgomeryPrivate
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{
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/**
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* Is invisible flag
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*/
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public const IS_INVISIBLE = true;
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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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public static function load(string $key, ?string $password = null): array
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{
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switch (strlen($key)) {
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case 32:
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$curve = new Curve25519();
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break;
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case 56:
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$curve = new Curve448();
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break;
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default:
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throw new LengthException('The only supported lengths are 32 and 56');
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}
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$components = ['curve' => $curve];
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$components['dA'] = new BigInteger($key, 256);
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$curve->rangeCheck($components['dA']);
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// note that EC::getEncodedCoordinates does some additional "magic" (it does strrev on the result)
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$components['QA'] = $components['curve']->multiplyPoint($components['curve']->getBasePoint(), $components['dA']);
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return $components;
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}
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/**
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* Convert an EC public key to the appropriate format
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*
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* @param Integer[] $publicKey
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*/
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public static function savePublicKey(MontgomeryCurve $curve, array $publicKey): string
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{
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return strrev($publicKey[0]->toBytes());
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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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* @param Integer[] $publicKey
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*/
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public static function savePrivateKey(BigInteger $privateKey, MontgomeryCurve $curve, array $publicKey, ?string $password = null): string
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{
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if (!empty($password) && is_string($password)) {
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throw new UnsupportedFormatException('MontgomeryPrivate private keys do not support encryption');
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}
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return $privateKey->toBytes();
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}
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}
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