Nettle - a low-level cryptographic library

Nettle is a cryptographic library that is designed to fit easily in more or less any context: In crypto toolkits for object-oriented languages (C++, Python, Pike, ...), in applications like LSH or GNUPG, or even in kernel space.

Documentation

A complete manual is included if you download the Nettle source code. You can also read the manual online.

http://www.lysator.liu.se/~nisse/nettle/