/**
* @param Context $context
* @param string $token
* @param string|resource $key
*
* @return string
*/
public static function decode(Context $context, $token, $key)
{
if (empty($token) || trim($token) === '') {
throw new JoseJwtException('Incoming token expected to be in compact serialization form, but is empty');
}
$parts = explode('.', $token);
if (count($parts) != 5) {
throw new JoseJwtException('Invalid JWE token');
}
$decodedParts = [];
foreach ($parts as $part) {
$decodedParts[] = UrlSafeB64Encoder::decode($part);
}
$headerString = $decodedParts[0];
$encryptedCek = $decodedParts[1];
$iv = $decodedParts[2];
$cipherText = $decodedParts[3];
$authTag = $decodedParts[4];
$header = json_decode($headerString, true);
if (null === $header) {
throw new JoseJwtException('Invalid header');
}
$algorithm = $context->jweAlgorithms()->get($header['alg']);
$encryption = $context->jweEncryptions()->get($header['enc']);
$cek = $algorithm->unwrap($encryptedCek, $key, $encryption->getKeySize(), $header);
$aad = $parts[0];
$plainText = $encryption->decrypt($aad, $cek, $iv, $cipherText, $authTag);
return $plainText;
}
/**
* @param string $value
* @param bool $raw
*
* @return RandomGeneratorMock
*/
public function add($value, $raw = false)
{
if (is_array($value)) {
array_unshift($value, 'C*');
$value = call_user_func_array('pack', $value);
$raw = true;
}
if (false === $raw) {
$value = UrlSafeB64Encoder::decode($value);
}
$len = strlen($value);
if (false === array_key_exists($len, $this->sequence)) {
$this->sequence[$len] = [];
}
$this->sequence[$len][] = $value;
return $this;
}
/**
* @param $token
*
* @return array
*/
public static function payload($token)
{
if (null === $token || trim($token) === '') {
throw new JoseJwtException('Incoming token expected to be in compact serialization form, but is empty');
}
$parts = explode('.', $token);
if (count($parts) != 3) {
throw new JoseJwtException('Invalid JWT');
}
$payload = json_decode(UrlSafeB64Encoder::decode($parts[1]), true);
if (null == $payload) {
throw new JoseJwtException('Invalid payload');
}
return $payload;
}
/**
* @expectedException \JoseJwt\Error\JoseJwtException
* @expectedExceptionMessage Invalid signature
*/
public function test_decode_throws_integrity_exception()
{
$headerEncoded = UrlSafeB64Encoder::encode(json_encode(['alg' => JwsAlgorithm::HS256]));
JWT::decode($this->context, $headerEncoded . '.bbb.ccc', 'key');
}
