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.
A complete manual is included if you download the Nettle source code. You can also read the manual online.
Get the latest version by https or ftp. Recent releases are signed with the following PGP key:
pub 2560R/28C67298 2013-01-07 Key fingerprint = 343C 2FF0 FBEE 5EC2 EDBE F399 F359 9FF8 28C6 7298 uid Niels Möller <nisse@lysator.liu.se>
I'm aware of nettle-bindings for the following higher-level languages.
Mail me for corrections or additions to this list.
The public git repository for Nettle is located at git.lysator.liu.se. After checkout, you need to run the .bootstrap script before the standard ./configure && make.
Earlier, Nettle was version controlled as part of the LSH repository. When converted to the current repository, the history of all files has been maintained as far as practical. But since the directory organization used to be a bit different, building old versions of Nettle from the current git repository does not work out of the box. To do that, you have to check out historic versions from the LSH repository instead.
Send mail to the nettle-bugs mailinglist or directly to me at Niels Möller <nisse@lysator.liu.se> if you have any questions.