Implement XEP-0380 for the OMEMO and OpenPGP plugins (#359)

* Implement XEP-0380 in a naive fashion for both the OMEMO and OpenPGP plugins

* Move the XEP-0380 namespace to a constant

* Move the implementation for xep-0380 to its own module

* Remove un-needed lines from plugins/openpgp/src/stream_module.vala

1 files changed, 14 insertions, 0 deletions

diff --git a/xmpp-vala/src/module/xep/0380_explicit_encryption.vala b/xmpp-vala/src/module/xep/0380_explicit_encryption.vala
new file mode 100644
index 00000000..710da92d
--- /dev/null
+++ b/xmpp-vala/src/module/xep/0380_explicit_encryption.vala
@@ -0,0 +1,14 @@
+namespace Xmpp.Xep.ExplicitEncryption {
+public const string NS_URI = "urn:xmpp:eme:0";
+
+public static void add_encryption_tag_to_message(MessageStanza message, string ns, string? name = null) {
+    StanzaNode encryption = new StanzaNode.build("encryption", NS_URI).add_self_xmlns()
+        .put_attribute("namespace", ns);
+
+    if(name != null)
+        encryption.put_attribute("name", name);
+
+    message.stanza.put_node(encryption);
+}
+    
+}