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