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Hi

I just wanted to let you know that I have used some of your test vectors to verify my C-implementation of the FPE algorithms. Of course I have mentioned the source and credit. Please feel free to check out the testvectors folder of this repository and inform me of any issues.

Now there is a problem that I wasn't able to figure out. The NIST has provided some sample vectors in this page. I could verify all of them using my own code, except two FF1 vectors that use 128-bit tweaks. You can find them at the bottom of the page:

"tcId": 2,
"tweak": "CB81CF732B22A983B2C6E584726C9F59",
"tweakLen": 128,
"pt": "60454384602180796680544707896451618557756152702734587161",
"key": "E3EFDAF1ABEA7863A0A95F833420D083"

"tcId": 27,
"tweak": "994C168B9F6225C4BC12A83561C0E1A6",
"tweakLen": 128,
"pt": "uxmdsdjbsywthsvzjlfcwlmpkarnaeoirtihgfuu",
"key": "53CA14AF6F97612C96FFAA2BA8D88C44"

This seems ironic since I have exactly followed the guidelines in SP-800-38G, and your library fails to verify them too. I double-checked and triple-checked the code with no luck. So I hope you guys @garyschneir @johntyner have some ideas about this.

Thanks