I'm afraid you've exhausted the limits of my precomputed benchmarks. :) I don't know the answer offhand, but I would suspect that hardware-accelerated AES-GCM

I'm afraid you've exhausted the limits of my precomputed benchmarks. :) I don't know the answer offhand, but I would suspect that hardware-accelerated AES-GCM would win. It certainly does in single-threaded, "one-session"-esque tests, and the margin of its victory makes me think that hardware-accelerated GCM would be hard to beat by anything. On my machine, a single thread/core running nothing but AES-GCM can encrypt/decrypt 8192 byte blocks of data at 1.32 GiB/s (this is using OpenSSL's benchmarking feature). Yes, that's gigabytes, not gigabits. It's literally faster than IO for my SSD. (Salsa20, without a MAC, can do the same at about 0.64 GiB/s.) When I told OpenSSL to use four threads in parallel, it ranked at 5.01 GiB/s, which is absolutely crazy. That said, beyond a general leaning towards AES-GCM (simply because it is so fast with hardware acceleration), I don't have any hard data on which would be the victor. But I may just construct some benchmarks to test that out, because it's an interesting question.