Free Cryptography libraries

What are the most stable and useful Cryptography libraries, that they are:

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• written with/for python, c++, c#, .net
• opensource, GNU, or other free license

The standard Python library (implementing common ciphers like AES and RSA) is PyCrypto. It doesn't support things like PKCS yet, however. There is a partial Python wrapper for the Crypto++ library given by PyCryptopp, which you may find useful.

The OpenSSL library is also wrapped for Python by PyOpenSSL. A Python implementation of SSH is Paramiko.

For C# and Java, there is bouncycastle. The granddaddy of crypto libraries is openssl. For C++, another very mature library is crypto++.

Take a look at KeyCzar

Some features of Keyczar include:

• A simple API
• Key rotation and versioning
• Safe default algorithms, modes, and key lengths
• Automated generation of initialization vectors and ciphertext signatures
• Java, Python, and C++ implementations
• International support in Java (Python coming soon)

Doesn't seem to have C# support though.

NSS works with C++, and has bindings for Java and Python, although I'm not sure if it has .NET/Mono bindings yet.