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-rw-r--r--Documentation/openssl-gcm.md13
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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
+```