132 lines
4.2 KiB
PHP
132 lines
4.2 KiB
PHP
<?php
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declare(strict_types=1);
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/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2014-2020 Spomky-Labs
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*
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* This software may be modified and distributed under the terms
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* of the MIT license. See the LICENSE file for details.
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*/
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namespace Jose\Component\Encryption\Serializer;
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use function array_key_exists;
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use Base64Url\Base64Url;
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use function count;
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use InvalidArgumentException;
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use Jose\Component\Core\Util\JsonConverter;
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use Jose\Component\Encryption\JWE;
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use Jose\Component\Encryption\Recipient;
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use LogicException;
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final class JSONGeneralSerializer implements JWESerializer
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{
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public const NAME = 'jwe_json_general';
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public function displayName(): string
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{
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return 'JWE JSON General';
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}
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public function name(): string
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{
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return self::NAME;
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}
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/**
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* @throws LogicException if there is no recipient
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*/
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public function serialize(JWE $jwe, ?int $recipientIndex = null): string
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{
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if (0 === $jwe->countRecipients()) {
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throw new LogicException('No recipient.');
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}
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$data = [
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'ciphertext' => Base64Url::encode($jwe->getCiphertext()),
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'iv' => Base64Url::encode($jwe->getIV()),
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'tag' => Base64Url::encode($jwe->getTag()),
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];
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if (null !== $jwe->getAAD()) {
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$data['aad'] = Base64Url::encode($jwe->getAAD());
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}
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if (0 !== count($jwe->getSharedProtectedHeader())) {
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$data['protected'] = $jwe->getEncodedSharedProtectedHeader();
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}
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if (0 !== count($jwe->getSharedHeader())) {
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$data['unprotected'] = $jwe->getSharedHeader();
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}
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$data['recipients'] = [];
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foreach ($jwe->getRecipients() as $recipient) {
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$temp = [];
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if (0 !== count($recipient->getHeader())) {
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$temp['header'] = $recipient->getHeader();
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}
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if (null !== $recipient->getEncryptedKey()) {
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$temp['encrypted_key'] = Base64Url::encode($recipient->getEncryptedKey());
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}
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$data['recipients'][] = $temp;
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}
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return JsonConverter::encode($data);
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}
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public function unserialize(string $input): JWE
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{
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$data = JsonConverter::decode($input);
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$this->checkData($data);
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$ciphertext = Base64Url::decode($data['ciphertext']);
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$iv = Base64Url::decode($data['iv']);
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$tag = Base64Url::decode($data['tag']);
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$aad = array_key_exists('aad', $data) ? Base64Url::decode($data['aad']) : null;
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[$encodedSharedProtectedHeader, $sharedProtectedHeader, $sharedHeader] = $this->processHeaders($data);
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$recipients = [];
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foreach ($data['recipients'] as $recipient) {
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[$encryptedKey, $header] = $this->processRecipient($recipient);
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$recipients[] = new Recipient($header, $encryptedKey);
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}
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return new JWE(
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$ciphertext,
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$iv,
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$tag,
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$aad,
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$sharedHeader,
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$sharedProtectedHeader,
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$encodedSharedProtectedHeader,
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$recipients
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);
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}
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/**
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* @throws InvalidArgumentException if the input is not supported
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*/
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private function checkData(?array $data): void
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{
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if (null === $data || !isset($data['ciphertext']) || !isset($data['recipients'])) {
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throw new InvalidArgumentException('Unsupported input.');
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}
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}
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private function processRecipient(array $recipient): array
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{
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$encryptedKey = array_key_exists('encrypted_key', $recipient) ? Base64Url::decode($recipient['encrypted_key']) : null;
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$header = array_key_exists('header', $recipient) ? $recipient['header'] : [];
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return [$encryptedKey, $header];
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}
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private function processHeaders(array $data): array
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{
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$encodedSharedProtectedHeader = array_key_exists('protected', $data) ? $data['protected'] : null;
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$sharedProtectedHeader = $encodedSharedProtectedHeader ? JsonConverter::decode(Base64Url::decode($encodedSharedProtectedHeader)) : [];
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$sharedHeader = array_key_exists('unprotected', $data) ? $data['unprotected'] : [];
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return [$encodedSharedProtectedHeader, $sharedProtectedHeader, $sharedHeader];
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}
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}
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