Hey there,
I've recently been working on some GCM cases with empty PT and AAD. I don't know how useful they are in practice, but they're legit and show up in validation tests (e.g., FIPS). Thought I'd share my tweaks. In getting this to work I ended up w/ some commits unrelated to the problem. They're useful anyway, I think, so I'll offer-up all of them as replies in this thread. (Total of 10 commits.) I've tested this on a 64-bit Ubuntu desktop system, and a 32-bit ARM, both running 2.6.35. More specifically, here're their faux unames: Ubuntu 10.10 x64 2.6.35-32-generic x86_64 GNU/Linux Android Gingerbread 2.6.35.7+ #16 SMP PREEMPT armv7l unknown In addition to running the functional tests included w/ cryptodev*, I've also fed through the tcrypt test cases (including the ones already in cipher-gcm) and some NIST test files via a user-space app. [Sorry: not going to share those. Updating cipher-gcm to include the other tcrypt cases is quick and would provide a nice double-check of my work.] Thanks in advance for taking a look! Please let me know if you'd prefer future patches in a different format. Regards, Jaren * I ran all the functional tests, not just cipher-gcm. I've not done the speed tests yet -- still need to swap out the posix_memaligns for Android.
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