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Are there any bignum libraries that are good for Windows use? I looked at GMP, but unfortunately it does not look like it can be compiled on Windows...(I'm going to be doing some custom RSA and hashing routines)
Thanks.
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People provide pre-compiled binaries for gmp on Windows; there are also instructions for compiling it yourself. Another option would be the bignum library of OpenSSL.
Also have a look at MAPM, A Portable Arbitrary Precision Math Library in C. It also contains C++ wrappers.
http://www.openssl.org/ is stable and time proven library. It also includes well separable bignum libray
Another option is MPIR. MPIR is a fork of GMP that specifically support compilation on Windows.