Brute-force a solution for xkcd.com/1193.

To compile in general: gcc -O3 skein_block.c skein.c main.c -o skein

If you are on Linux x64: gcc -O3 skein_block_x64.s skein.c main.c -o skein

To run: ./skein [string]

[string] is the string you wish to start with. It should only be alpha-numeric characters, though this is not explicitly checked for.