libgocryptfs/Documentation/openssl-gcm.md

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Go builtin GCM vs OpenSSL
=========================
OpenSSL is over four times faster than Go's built-in GCM implementation.
```
$ cd internal/stupidgcm
$ go test -bench .
PASS
Benchmark4kEncStupidGCM-2 50000 25860 ns/op 158.39 MB/s
Benchmark4kEncGoGCM-2 10000 116050 ns/op 35.29 MB/s
ok github.com/rfjakob/gocryptfs/internal/stupidgcm 3.667s
```