crypto/aes: implement ctrAble when using AES-NI on amd64 #20967
Description
What version of Go are you using (go version)?
1.8.3
What operating system and processor architecture are you using (go env)?
linux/amd64
What did you do?
Benchmarked CTR-AES128 backed by crypto/aes on a system with AES-NI.
What did you expect to see?
Acceptable performance.
What did you see instead?
~400 MB/s for 1 KiB writes. For reference the same system using crypto/aes's gcmAble does GCM-AES128 Seal() at ~1300 MB/s. A cursory look at the source suggests that there is no special case ctrAble implementation for AES-NI.