C source code: https://gist.github.com/jhoenicke/2e39b3c6c49b1d7b216b8626197e4b89

A bit dated now as it only has the first 51 keys.

I changed the GSTEP value from (1<<25) to (1<<29) (table size increases from 0.5GB to 8GB), but trying 30 or anything larger bombs out at compile time. Creating the 8GB table (before it even starts working on the cracking) is also taking a long, long time. And once it starts cracking it will take at least 8-10 hours (assuming crack time scales linearly). Maybe by then the winner will have posted here, and voided all of our work.

Edit: I managed to get it to compile and run with a 16GB table. I think this will be sufficient to crack key #62.