125 lines
4.2 KiB
PHP
125 lines
4.2 KiB
PHP
<?php
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declare(strict_types=1);
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namespace Jose\Component\Encryption\Serializer;
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use InvalidArgumentException;
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use Jose\Component\Core\Util\Base64UrlSafe;
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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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use function array_key_exists;
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use function count;
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use function is_array;
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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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public function serialize(JWE $jwe, ?int $recipientIndex = null): string
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{
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if ($jwe->countRecipients() === 0) {
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throw new LogicException('No recipient.');
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}
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$data = [
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'ciphertext' => Base64UrlSafe::encodeUnpadded($jwe->getCiphertext() ?? ''),
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'iv' => Base64UrlSafe::encodeUnpadded($jwe->getIV() ?? ''),
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'tag' => Base64UrlSafe::encodeUnpadded($jwe->getTag() ?? ''),
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];
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if ($jwe->getAAD() !== null) {
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$data['aad'] = Base64UrlSafe::encodeUnpadded($jwe->getAAD());
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}
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if (count($jwe->getSharedProtectedHeader()) !== 0) {
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$data['protected'] = $jwe->getEncodedSharedProtectedHeader();
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}
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if (count($jwe->getSharedHeader()) !== 0) {
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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 (count($recipient->getHeader()) !== 0) {
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$temp['header'] = $recipient->getHeader();
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}
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if ($recipient->getEncryptedKey() !== null) {
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$temp['encrypted_key'] = Base64UrlSafe::encodeUnpadded($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($input);
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if (! is_array($data)) {
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throw new InvalidArgumentException('Unsupported input.');
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}
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$this->checkData($data);
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$ciphertext = Base64UrlSafe::decodeNoPadding($data['ciphertext']);
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$iv = Base64UrlSafe::decodeNoPadding($data['iv']);
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$tag = Base64UrlSafe::decodeNoPadding($data['tag']);
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$aad = array_key_exists('aad', $data) ? Base64UrlSafe::decodeNoPadding($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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private function checkData(?array $data): void
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{
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if ($data === null || ! 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', $recipient) ? Base64UrlSafe::decodeNoPadding(
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$recipient['encrypted_key']
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) : 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 = $encodedSharedProtectedHeader ? JsonConverter::decode(
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Base64UrlSafe::decodeNoPadding($encodedSharedProtectedHeader)
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) : [];
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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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