SkeinFish is an implementation of Skein and Threefish, with a focus on speed and completeness. Skein is a general purpose hash algorithm and Threefish is a general purpose block cipher. Both were designed by Bruce Schneier, among others.

This is an implementation of both algorithms in C#.

Changelog

0.5.0

• Updated to Skein 1.3

0.4.5

• New Initialize() overloads to enable any custom UBI chaining, such as MAC Hashing
• Exposed the UBI tweaking interface.
• Code refactoring, changes, and cleanups
• Minor bug fixes

0.4.1

• Fixed some long standing bugs

0.4

• Added supplementary Skein testing project
• Added benchmarking function
• Added self-test validation function
• Added template classes for SHA3 output sizes
• Small performance improvements
• Bug fixes

0.3.5

• Implemented Skein 1.2.

Quick and Dirty usage guide

First, add a reference to SkeinFish.dll to your project. Next, use as such:

using SkeinFish;

static byte[] hash_skein(byte[] input)
{
	// (state_size, output_size)
	Skein skein = new Skein(512, 512); 
	
	return skein.ComputeHash(input, 0, input.Length);
}

Using Threefish

The Threefish block cipher is also implemented as part of SkeinFish (hence the name). To use it, simply instantiate a Threefish object and use it as you would any other cipher in the .NET library. It supports all encryption modes except CTS. All padding modes are supported.