docs: def decode_der(cert_der):
      """Decode cert DER string to Certificate object.
  
      Args:
        cert_der : Certificate as a DER encoded string
  
      Returns:
        cryptography.Certificate()
  
      """
      return cryptography.x509.load_der_x509_certificate(
          data=cert_der, backend=cryptography.hazmat.backends.default_backend()
      )