XMPP Prekey Server for OTRv4 and forward

This project implements an XMPP Component (XEP-114) that allows XMPP server providers to deploy an OTRv4 Prekey Server in an easy way.

In order to use this component, you also need to run the Raw prekey server.

If you're using Prosody, you can add configuration options like these to add the server:

component_ports = { 42335 }
component_interface = "127.0.0.1"

Component "prekeys.example.com"
        component_secret = "changeme"
        name = "OTR Prekey Server"

You also need to add a DNS s2s entry for the domain you're using.

For ejabberd you can add an equivalent ejabberd_service.

Assuming you have the raw server running on localhost with the default port you can now start the xmpp server like this:

$ ./prekey-server-xmpp -xmpp-address 127.0.0.1 -xmpp-port 42335 -shared-secret "changeme" -name prekeys.example.com -fingerprint 123AAAAAAAAAAAAAAAAA123CDCDCDABABABABABA88797676556456421132425673535467575765AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

This component will now be discoverable as prekeys.example.com inside the XMPP server - it will respond to disco#info and disco#items, and messages sent to it will be forwarded to the Raw prekey server.