http://www.eskimo.com/~weidai/cryptlib.html - Crypto++ 5.1 -> I've never used this, but is appears to have huge support for many different algorithms, both Public and Private Key. Their SourceForge website ( https://sourceforge.net/project/show...?group_id=6152 ) also has download links, but the first one seems to describe parts better, and has other mirrors. I think that their license allows you to use it, but it isn't GPL. It is public domainish, but you should look at it for yourself. http://www.eskimo.com/~weidai/License.txt

Good luck. Hope that helps and that you can compile it.