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here a Idea for your problem. Had the same as well. Searched a long time to get my Keys to the Android phone. I work with OSX. There is a tutorial how to Export the keys it seems to be a matter of Key and Certificate conversion. Hope that helps:

http://hackonadime.blogspot.de/2012/03/securing-your-mobile-email-thunderbird.html

Here's an idea for your problem. Had the same as well. Searched a long time to get my Keys to the Android phone. 

I work with OSX. There is a tutorial how to Export the keys it seems to be a matter of Key and Certificate conversion. Hope that helps:

http://hackonadime.blogspot.de/2012/03/securing-your-mobile-email-thunderbird.html