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<?php declare(strict_types=1); namespace Jose\Component\Encryption\Serializer; use InvalidArgumentException; use Jose\Component\Core\Util\JsonConverter; use Jose\Component\Encryption\JWE; use Jose\Component\Encryption\Recipient; use LogicException; use ParagonIE\ConstantTime\Base64UrlSafe; use Throwable; use function count; use function is_array; final class CompactSerializer implements JWESerializer { public const NAME = 'jwe_compact'; public function displayName(): string { return 'JWE Compact'; } public function name(): string { return self::NAME; } public function serialize(JWE $jwe, ?int $recipientIndex = null): string { if ($recipientIndex === null) { $recipientIndex = 0; } $recipient = $jwe->getRecipient($recipientIndex); $this->checkHasNoAAD($jwe); $this->checkHasSharedProtectedHeader($jwe); $this->checkRecipientHasNoHeader($jwe, $recipientIndex); return sprintf( '%s.%s.%s.%s.%s', $jwe->getEncodedSharedProtectedHeader(), Base64UrlSafe::encodeUnpadded($recipient->getEncryptedKey() ?? ''), Base64UrlSafe::encodeUnpadded($jwe->getIV() ?? ''), Base64UrlSafe::encodeUnpadded($jwe->getCiphertext() ?? ''), Base64UrlSafe::encodeUnpadded($jwe->getTag() ?? '') ); } public function unserialize(string $input): JWE { $parts = explode('.', $input); if (count($parts) !== 5) { throw new InvalidArgumentException('Unsupported input'); } try { $encodedSharedProtectedHeader = $parts[0]; $sharedProtectedHeader = JsonConverter::decode( Base64UrlSafe::decodeNoPadding($encodedSharedProtectedHeader) ); if (! is_array($sharedProtectedHeader)) { throw new InvalidArgumentException('Unsupported input.'); } $encryptedKey = $parts[1] === '' ? null : Base64UrlSafe::decodeNoPadding($parts[1]); $iv = Base64UrlSafe::decodeNoPadding($parts[2]); $ciphertext = Base64UrlSafe::decodeNoPadding($parts[3]); $tag = Base64UrlSafe::decodeNoPadding($parts[4]); return new JWE( $ciphertext, $iv, $tag, null, [], $sharedProtectedHeader, $encodedSharedProtectedHeader, [new Recipient([], $encryptedKey)] ); } catch (Throwable $throwable) { throw new InvalidArgumentException('Unsupported input', $throwable->getCode(), $throwable); } } private function checkHasNoAAD(JWE $jwe): void { if ($jwe->getAAD() !== null) { throw new LogicException('This JWE has AAD and cannot be converted into Compact JSON.'); } } private function checkRecipientHasNoHeader(JWE $jwe, int $id): void { if (count($jwe->getSharedHeader()) !== 0 || count($jwe->getRecipient($id)->getHeader()) !== 0) { throw new LogicException( 'This JWE has shared header parameters or recipient header parameters and cannot be converted into Compact JSON.' ); } } private function checkHasSharedProtectedHeader(JWE $jwe): void { if (count($jwe->getSharedProtectedHeader()) === 0) { throw new LogicException( 'This JWE does not have shared protected header parameters and cannot be converted into Compact JSON.' ); } } }
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