libgocryptfs/internal/prefer_openssl/prefer.go

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package prefer_openssl
import (
"fmt"
"io/ioutil"
"regexp"
)
// 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 {
ci, err := ioutil.ReadFile(file)
if err != nil {
fmt.Println(err)
return true
}
haveAes, err := regexp.Match(`(?m)^flags.*\baes\b`, ci)
if err != nil {
fmt.Println(err)
return true
}
return !haveAes
}