PySkein is an extension module for Python 3.0 or later implementing the Skein hash algorithm, one of the Second Round Candidates in the NIST SHA-3 Competition. While originally based on the optimized version of the reference implementation by Doug Whiting, PySkein has since evolved into a feature-rich and pythonic module. It is released as free software under the GNU General Public License. Its highlights are:
New in version 0.6: Tree hashing with arbitrary tree parameters