openpgp urn:xmpp:openpgp:0 org.jivesoftware.smackx.ox.provider.OpenPgpElementProvider pubkey urn:xmpp:openpgp:0 org.jivesoftware.smackx.ox.provider.PubkeyElementProvider secretkey urn:xmpp:openpgp:0 org.jivesoftware.smackx.ox.provider.SecretkeyElementProvider public-keys-list urn:xmpp:openpgp:0 org.jivesoftware.smackx.ox.provider.PublicKeysListElementProvider