code: public Observable<CertificateDescriptionInner> verifyAsync(String resourceGroupName, String resourceName, String certificateName, String ifMatch, String certificate) {
          return verifyWithServiceResponseAsync(resourceGroupName, resourceName, certificateName, ifMatch, certificate).map(new Func1<ServiceResponse<CertificateDescriptionInner>, CertificateDescriptionInner>() {
              @Override
              public CertificateDescriptionInner call(ServiceResponse<CertificateDescriptionInner> response) {
                  return response.body();
              }
          });
      }
docs: Verify certificate's private key possession.
  Verifies the certificate's private key possession by providing the leaf cert issued by the verifying pre uploaded certificate.
  
  @param resourceGroupName The name of the resource group that contains the IoT hub.
  @param resourceName The name of the IoT hub.
  @param certificateName The name of the certificate
  @param ifMatch ETag of the Certificate.
  @param certificate base-64 representation of X509 certificate .cer file or just .pem file content.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the CertificateDescriptionInner object