chacha20: Pure Python 2 and Python 3 implementations of the ChaCha20 stream cipher ^^^^^^ chacha20.py contains the pure Python 2 implementation (which works with Python 2.4, 2.5, 2.6 and 2.7). chacha20_python3.py contains the pure Python 3 implementation (which works with Python 3.5.3 and probably earlier Python 3.x). More info about ChaCha20: * https://en.wikipedia.org/wiki/Salsa20 * http://cr.yp.to/chacha.html __END__