Bug with unicode

[whncode]

There is bug in keychar, when you try decrypt unicode (you get empty string). I'm bypased it by adding:

value = value.encode('unicode_escape') in get_prep_value. And in to python: value.decode('unicode_escape').

[defrex]

I just pushed a fix for this. Let me know if you have any issues with it.

[whncode]

Thanks, works perfect!