package prefer_openssl import ( "io/ioutil" "regexp" "runtime" "github.com/rfjakob/gocryptfs/internal/tlog" ) // filePreferOpenSSL tells us if OpenSSL is faster than Go GCM on this machine. // Go GCM is fastern when the CPU has AES instructions and Go is v1.6 or higher. // // See https://github.com/rfjakob/gocryptfs/issues/23#issuecomment-218286502 // for benchmarks. // // filePreferOpenSSL takes an explicit filename so it can be tested with saved // cpuinfo files instead of /proc/cpuinfo. func filePreferOpenSSL(file string) bool { if runtime.GOOS == "darwin" && file == "/proc/cpuinfo" { // OSX does not have /proc, let's not warn about it. return true } ci, err := ioutil.ReadFile(file) if err != nil { return true } haveAes, err := regexp.Match(`(?m)^flags.*\baes\b`, ci) if err != nil { tlog.Warn.Println(err) return true } return !haveAes }