308 lines
9.0 KiB
PHP
308 lines
9.0 KiB
PHP
<?php
|
|
|
|
declare(strict_types=1);
|
|
|
|
/*
|
|
* The MIT License (MIT)
|
|
*
|
|
* Copyright (c) 2014-2020 Spomky-Labs
|
|
*
|
|
* This software may be modified and distributed under the terms
|
|
* of the MIT license. See the LICENSE file for details.
|
|
*/
|
|
|
|
namespace Jose\Component\KeyManagement\KeyConverter;
|
|
|
|
use function array_key_exists;
|
|
use Base64Url\Base64Url;
|
|
use function count;
|
|
use FG\ASN1\ASNObject;
|
|
use FG\ASN1\Exception\ParserException;
|
|
use FG\ASN1\ExplicitlyTaggedObject;
|
|
use FG\ASN1\Universal\BitString;
|
|
use FG\ASN1\Universal\Integer;
|
|
use FG\ASN1\Universal\ObjectIdentifier;
|
|
use FG\ASN1\Universal\OctetString;
|
|
use FG\ASN1\Universal\Sequence;
|
|
use InvalidArgumentException;
|
|
use function is_array;
|
|
use function is_string;
|
|
|
|
/**
|
|
* @internal
|
|
*/
|
|
class ECKey
|
|
{
|
|
/**
|
|
* @var array
|
|
*/
|
|
private $values = [];
|
|
|
|
private function __construct(array $data)
|
|
{
|
|
$this->loadJWK($data);
|
|
}
|
|
|
|
public static function createFromPEM(string $pem): self
|
|
{
|
|
$data = self::loadPEM($pem);
|
|
|
|
return new self($data);
|
|
}
|
|
|
|
/**
|
|
* @param ECKey $private
|
|
*
|
|
* @return ECKey
|
|
*/
|
|
public static function toPublic(self $private): self
|
|
{
|
|
$data = $private->toArray();
|
|
if (array_key_exists('d', $data)) {
|
|
unset($data['d']);
|
|
}
|
|
|
|
return new self($data);
|
|
}
|
|
|
|
/**
|
|
* @return array
|
|
*/
|
|
public function toArray()
|
|
{
|
|
return $this->values;
|
|
}
|
|
|
|
/**
|
|
* @throws InvalidArgumentException if the key cannot be loaded
|
|
* @throws ParserException if the key cannot be loaded
|
|
*/
|
|
private static function loadPEM(string $data): array
|
|
{
|
|
$data = base64_decode(preg_replace('#-.*-|\r|\n#', '', $data), true);
|
|
$asnObject = ASNObject::fromBinary($data);
|
|
if (!$asnObject instanceof Sequence) {
|
|
throw new InvalidArgumentException('Unable to load the key.');
|
|
}
|
|
$children = $asnObject->getChildren();
|
|
if (self::isPKCS8($children)) {
|
|
$children = self::loadPKCS8($children);
|
|
}
|
|
|
|
if (4 === count($children)) {
|
|
return self::loadPrivatePEM($children);
|
|
}
|
|
if (2 === count($children)) {
|
|
return self::loadPublicPEM($children);
|
|
}
|
|
|
|
throw new InvalidArgumentException('Unable to load the key.');
|
|
}
|
|
|
|
/**
|
|
* @param ASNObject[] $children
|
|
*
|
|
* @throws InvalidArgumentException if the key cannot be loaded
|
|
* @throws ParserException if the key cannot be loaded
|
|
*/
|
|
private static function loadPKCS8(array $children): array
|
|
{
|
|
$binary = hex2bin($children[2]->getContent());
|
|
$asnObject = ASNObject::fromBinary($binary);
|
|
if (!$asnObject instanceof Sequence) {
|
|
throw new InvalidArgumentException('Unable to load the key.');
|
|
}
|
|
|
|
return $asnObject->getChildren();
|
|
}
|
|
|
|
/**
|
|
* @throws InvalidArgumentException if the key cannot be loaded
|
|
*/
|
|
private static function loadPublicPEM(array $children): array
|
|
{
|
|
if (!$children[0] instanceof Sequence) {
|
|
throw new InvalidArgumentException('Unsupported key type.');
|
|
}
|
|
|
|
$sub = $children[0]->getChildren();
|
|
if (!$sub[0] instanceof ObjectIdentifier) {
|
|
throw new InvalidArgumentException('Unsupported key type.');
|
|
}
|
|
if ('1.2.840.10045.2.1' !== $sub[0]->getContent()) {
|
|
throw new InvalidArgumentException('Unsupported key type.');
|
|
}
|
|
if (!$sub[1] instanceof ObjectIdentifier) {
|
|
throw new InvalidArgumentException('Unsupported key type.');
|
|
}
|
|
if (!$children[1] instanceof BitString) {
|
|
throw new InvalidArgumentException('Unable to load the key.');
|
|
}
|
|
|
|
$bits = $children[1]->getContent();
|
|
$bits_length = mb_strlen($bits, '8bit');
|
|
if (0 !== mb_strpos($bits, '04', 0, '8bit')) {
|
|
throw new InvalidArgumentException('Unsupported key type');
|
|
}
|
|
|
|
$values = ['kty' => 'EC'];
|
|
$values['crv'] = self::getCurve($sub[1]->getContent());
|
|
|
|
$xBin = hex2bin(mb_substr($bits, 2, ($bits_length - 2) / 2, '8bit'));
|
|
$yBin = hex2bin(mb_substr($bits, (int) (($bits_length - 2) / 2 + 2), ($bits_length - 2) / 2, '8bit'));
|
|
if (!is_string($xBin) || !is_string($yBin)) {
|
|
throw new InvalidArgumentException('Unable to load the key.');
|
|
}
|
|
|
|
$values['x'] = Base64Url::encode($xBin);
|
|
$values['y'] = Base64Url::encode($yBin);
|
|
|
|
return $values;
|
|
}
|
|
|
|
/**
|
|
* @throws InvalidArgumentException if the OID is not supported
|
|
*/
|
|
private static function getCurve(string $oid): string
|
|
{
|
|
$curves = self::getSupportedCurves();
|
|
$curve = array_search($oid, $curves, true);
|
|
if (!is_string($curve)) {
|
|
throw new InvalidArgumentException('Unsupported OID.');
|
|
}
|
|
|
|
return $curve;
|
|
}
|
|
|
|
private static function getSupportedCurves(): array
|
|
{
|
|
return [
|
|
'P-256' => '1.2.840.10045.3.1.7',
|
|
'P-384' => '1.3.132.0.34',
|
|
'P-521' => '1.3.132.0.35',
|
|
];
|
|
}
|
|
|
|
/**
|
|
* @throws InvalidArgumentException if the key cannot be loaded
|
|
*/
|
|
private static function verifyVersion(ASNObject $children): void
|
|
{
|
|
if (!$children instanceof Integer || '1' !== $children->getContent()) {
|
|
throw new InvalidArgumentException('Unable to load the key.');
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @throws InvalidArgumentException if the key cannot be loaded
|
|
*/
|
|
private static function getXAndY(ASNObject $children, string &$x, string &$y): void
|
|
{
|
|
if (!$children instanceof ExplicitlyTaggedObject || !is_array($children->getContent())) {
|
|
throw new InvalidArgumentException('Unable to load the key.');
|
|
}
|
|
if (!$children->getContent()[0] instanceof BitString) {
|
|
throw new InvalidArgumentException('Unable to load the key.');
|
|
}
|
|
|
|
$bits = $children->getContent()[0]->getContent();
|
|
$bits_length = mb_strlen($bits, '8bit');
|
|
|
|
if (0 !== mb_strpos($bits, '04', 0, '8bit')) {
|
|
throw new InvalidArgumentException('Unsupported key type');
|
|
}
|
|
|
|
$x = mb_substr($bits, 2, (int) (($bits_length - 2) / 2), '8bit');
|
|
$y = mb_substr($bits, (int) (($bits_length - 2) / 2 + 2), (int) (($bits_length - 2) / 2), '8bit');
|
|
}
|
|
|
|
/**
|
|
* @throws InvalidArgumentException if the key cannot be loaded
|
|
*/
|
|
private static function getD(ASNObject $children): string
|
|
{
|
|
if (!$children instanceof OctetString) {
|
|
throw new InvalidArgumentException('Unable to load the key.');
|
|
}
|
|
|
|
return $children->getContent();
|
|
}
|
|
|
|
/**
|
|
* @throws InvalidArgumentException if the key cannot be loaded
|
|
*/
|
|
private static function loadPrivatePEM(array $children): array
|
|
{
|
|
self::verifyVersion($children[0]);
|
|
$x = '';
|
|
$y = '';
|
|
$d = self::getD($children[1]);
|
|
self::getXAndY($children[3], $x, $y);
|
|
|
|
if (!$children[2] instanceof ExplicitlyTaggedObject || !is_array($children[2]->getContent())) {
|
|
throw new InvalidArgumentException('Unable to load the key.');
|
|
}
|
|
if (!$children[2]->getContent()[0] instanceof ObjectIdentifier) {
|
|
throw new InvalidArgumentException('Unable to load the key.');
|
|
}
|
|
|
|
$curve = $children[2]->getContent()[0]->getContent();
|
|
$dBin = hex2bin($d);
|
|
$xBin = hex2bin($x);
|
|
$yBin = hex2bin($y);
|
|
if (!is_string($dBin) || !is_string($xBin) || !is_string($yBin)) {
|
|
throw new InvalidArgumentException('Unable to load the key.');
|
|
}
|
|
|
|
$values = ['kty' => 'EC'];
|
|
$values['crv'] = self::getCurve($curve);
|
|
$values['d'] = Base64Url::encode($dBin);
|
|
$values['x'] = Base64Url::encode($xBin);
|
|
$values['y'] = Base64Url::encode($yBin);
|
|
|
|
return $values;
|
|
}
|
|
|
|
/**
|
|
* @param ASNObject[] $children
|
|
*/
|
|
private static function isPKCS8(array $children): bool
|
|
{
|
|
if (3 !== count($children)) {
|
|
return false;
|
|
}
|
|
|
|
$classes = [0 => Integer::class, 1 => Sequence::class, 2 => OctetString::class];
|
|
foreach ($classes as $k => $class) {
|
|
if (!$children[$k] instanceof $class) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @throws InvalidArgumentException if the key is invalid
|
|
*/
|
|
private function loadJWK(array $jwk): void
|
|
{
|
|
$keys = [
|
|
'kty' => 'The key parameter "kty" is missing.',
|
|
'crv' => 'Curve parameter is missing',
|
|
'x' => 'Point parameters are missing.',
|
|
'y' => 'Point parameters are missing.',
|
|
];
|
|
foreach ($keys as $k => $v) {
|
|
if (!array_key_exists($k, $jwk)) {
|
|
throw new InvalidArgumentException($v);
|
|
}
|
|
}
|
|
|
|
if ('EC' !== $jwk['kty']) {
|
|
throw new InvalidArgumentException('JWK is not an Elliptic Curve key.');
|
|
}
|
|
$this->values = $jwk;
|
|
}
|
|
}
|