child-cfg: Generalize get_ke_method() method

src/libcharon/config/child_cfg.c

@@ -484,24 +484,23 @@ METHOD(child_cfg_t, get_close_action, action_t,
 	return this->close_action;
 }
 
-METHOD(child_cfg_t, get_ke_method, key_exchange_method_t,
-	private_child_cfg_t *this)
+METHOD(child_cfg_t, get_algorithm, uint16_t,
+	private_child_cfg_t *this, transform_type_t type)
 {
 	enumerator_t *enumerator;
 	proposal_t *proposal;
-	uint16_t method = KE_NONE;
+	uint16_t alg = 0;
 
 	enumerator = this->proposals->create_enumerator(this->proposals);
 	while (enumerator->enumerate(enumerator, &proposal))
 	{
-		if (proposal->get_algorithm(proposal, KEY_EXCHANGE_METHOD, &method,
-									NULL))
+		if (proposal->get_algorithm(proposal, type, &alg, NULL))
 		{
 			break;
 		}
 	}
 	enumerator->destroy(enumerator);
-	return method;
+	return alg;
 }
 
 METHOD(child_cfg_t, get_inactivity, uint32_t,
@@ -759,7 +758,7 @@ child_cfg_t *child_cfg_create(char *name, child_cfg_create_t *data)
 			.get_dpd_action = _get_dpd_action,
 			.get_close_action = _get_close_action,
 			.get_lifetime = _get_lifetime,
-			.get_ke_method = _get_ke_method,
+			.get_algorithm = _get_algorithm,
 			.get_inactivity = _get_inactivity,
 			.get_reqid = _get_reqid,
 			.get_if_id = _get_if_id,

src/libcharon/config/child_cfg.h

@@ -204,11 +204,16 @@ struct child_cfg_t {
 	action_t (*get_close_action) (child_cfg_t *this);
 
 	/**
-	 * Get the key exchange method to use for CHILD_SA setup.
+	 * Get the first algorithm of a certain transform type that's contained in
+	 * any of the configured proposals.
 	 *
-	 * @return				key exchange method to use
+	 * For instance, use with KEY_EXCHANGE_METHOD to get the KE method to use
+	 * for the CHILD_SA initiation.
+	 *
+	 * @param type			transform type to look for
+	 * @return				algorithm identifier (0 for none)
 	 */
-	key_exchange_method_t (*get_ke_method)(child_cfg_t *this);
+	uint16_t (*get_algorithm)(child_cfg_t *this, transform_type_t type);
 
 	/**
 	 * Get the inactivity timeout value.