Jose\Object\JWEInterface::getRecipient PHP Method

    public function &getRecipient($id);

 /**
  * @param \Jose\Object\JWEInterface    $jwe
  * @param \Jose\Object\JWKSetInterface $jwk_set
  * @param int                          $i
  *
  * @return int|null
  */
 private function decryptRecipientKey(Object\JWEInterface &$jwe, Object\JWKSetInterface $jwk_set, $i)
 {
     $recipient = $jwe->getRecipient($i);
     $complete_headers = array_merge($jwe->getSharedProtectedHeaders(), $jwe->getSharedHeaders(), $recipient->getHeaders());
     $this->checkCompleteHeader($complete_headers);
     $key_encryption_algorithm = $this->getKeyEncryptionAlgorithm($complete_headers);
     $content_encryption_algorithm = $this->getContentEncryptionAlgorithm($complete_headers);
     foreach ($jwk_set as $jwk) {
         try {
             $this->checkKeyUsage($jwk, 'decryption');
             if ('dir' !== $key_encryption_algorithm->getAlgorithmName()) {
                 $this->checkKeyAlgorithm($jwk, $key_encryption_algorithm->getAlgorithmName());
             } else {
                 $this->checkKeyAlgorithm($jwk, $content_encryption_algorithm->getAlgorithmName());
             }
             $cek = $this->decryptCEK($key_encryption_algorithm, $content_encryption_algorithm, $jwk, $recipient, $complete_headers);
             if (null !== $cek) {
                 if (true === $this->decryptPayload($jwe, $cek, $content_encryption_algorithm, $complete_headers)) {
                     return $i;
                 }
             }
         } catch (\Exception $e) {
             //We do nothing, we continue with other keys
             continue;
         }
     }
 }