code: public Observable<Certificate> getAsync(String thumbprintAlgorithm, String thumbprint) {
          return getWithServiceResponseAsync(thumbprintAlgorithm, thumbprint).map(new Func1<ServiceResponseWithHeaders<Certificate, CertificateGetHeaders>, Certificate>() {
              @Override
              public Certificate call(ServiceResponseWithHeaders<Certificate, CertificateGetHeaders> response) {
                  return response.body();
              }
          });
      }
docs: Gets information about the specified certificate.
  
  @param thumbprintAlgorithm The algorithm used to derive the thumbprint parameter. This must be sha1.
  @param thumbprint The thumbprint of the certificate to get.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the Certificate object