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<?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) 2014-2019 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 Base64Url\Base64Url; |
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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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list($encodedSharedProtectedHeader, $sharedProtectedHeader, $sharedHeader) = $this->processHeaders($data); |
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$recipients = []; |
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foreach ($data['recipients'] as $recipient) { |
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list($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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web-token /
jwt-framework
