Hi Everyone,

We caught a bug report for SKIPJACK. Also see 
https://github.com/weidai11/cryptopp/issues/824.

It looks like we provide an optimized version of the algorithm, and the 
results are not consistent with other implementations. We also lack test 
vectors.

Interesting in a morbid sort of way, none of these arrive at the same 
results: Botan, Crypto++, Ref Impl (original/unoptimized), Ref Impl 
(optimized).

NIST provides one SKIPJACK  test vector at SP800-17 for decryption. NIST 
has withdrawn all SKIPJACK encryption documentation. I don't know which (if 
any) implementations arrive at the test vector.

I think the way forward is, find which implementation arrives at the test 
vector, and use it in the library.

Any thoughts or comments?

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