code: def sign_metadata(metadata, key, cert, sign_algorithm=OneLogin_Saml2_Constants.RSA_SHA1, digest_algorithm=OneLogin_Saml2_Constants.SHA1):
          
          return OneLogin_Saml2_Utils.add_sign(metadata, key, cert, False, sign_algorithm, digest_algorithm)
docs: Signs the metadata with the key/cert provided
  
          :param metadata: SAML Metadata XML
          :type metadata: string
  
          :param key: x509 key
          :type key: string
  
          :param cert: x509 cert
          :type cert: string
  
          :returns: Signed Metadata
          :rtype: string
  
          :param sign_algorithm: Signature algorithm method
          :type sign_algorithm: string
  
          :param digest_algorithm: Digest algorithm method
          :type digest_algorithm: string