have you checked the source code i posted in earlier messages ?
and yes the key was for signing the text not encryption so MITM would definetly work

and what was the issue with the password ?

and are u building it to work with the telepathy system ? or stand alone ?
if ur doing it within telepathy open a git and add some developers (start with me) we can togetjer set this thing to work and screw those companies who dosen't care for developing stuff for such a gr8 mobile !!!