Import the C bits as unsafe.
Get 1k of keystream per call for the Skein stream cipher.
Add encryptBytes and decryptBytes to Crypto.Threefish.Authenticated.
Export Key256 from Crypto.Threefish.Authenticated.
Have encryptBytes output a ByteString.
Get rid of Bytes type.
Relax ByteString version constraint.
Bump version to 0.2.1.