diff --git a/src/libcharon/encoding/payloads/id_payload.c b/src/libcharon/encoding/payloads/id_payload.c
index 4d5cd05fe..02b07d691 100755
--- a/src/libcharon/encoding/payloads/id_payload.c
+++ b/src/libcharon/encoding/payloads/id_payload.c
@@ -327,6 +327,15 @@ METHOD(id_payload_t, get_ts, traffic_selector_t*,
 	return NULL;
 }
 
+METHOD(id_payload_t, get_encoded, chunk_t,
+	private_id_payload_t *this)
+{
+	u_int16_t port = htons(this->port);
+	return chunk_cat("cccc", chunk_from_thing(this->id_type),
+					 chunk_from_thing(this->protocol_id),
+					 chunk_from_thing(port), this->id_data);
+}
+
 METHOD2(payload_t, id_payload_t, destroy, void,
 	private_id_payload_t *this)
 {
@@ -354,6 +363,7 @@ id_payload_t *id_payload_create(payload_type_t type)
 				.destroy = _destroy,
 			},
 			.get_identification = _get_identification,
+			.get_encoded = _get_encoded,
 			.get_ts = _get_ts,
 			.destroy = _destroy,
 		},
diff --git a/src/libcharon/encoding/payloads/id_payload.h b/src/libcharon/encoding/payloads/id_payload.h
index 22016bc19..94ed1cb38 100644
--- a/src/libcharon/encoding/payloads/id_payload.h
+++ b/src/libcharon/encoding/payloads/id_payload.h
@@ -54,6 +54,13 @@ struct id_payload_t {
 	 */
 	traffic_selector_t* (*get_ts)(id_payload_t *this);
 
+	/**
+	 * Get encoded payload without fixed payload header (used for IKEv1).
+	 *
+	 * @return				encoded payload (gets allocated)
+	 */
+	chunk_t (*get_encoded)(id_payload_t *this);
+
 	/**
 	 * Destroys an id_payload_t object.
 	 */