Minimal code for RSA support from LibTomMath 0.41
http://libtom.org/
http://libtom.org/files/ltm-0.41.tar.bz2
This library was released in public domain by Tom St Denis.

The combination in this file may not use all of the optimized algorithms
from LibTomMath and may be considerable slower than the LibTomMath with its
default settings. The main purpose of having this version here is to make it
easier to build bignum.c wrapper without having to install and build an
external library.