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package machineid
import (
"crypto/hmac"
"crypto/sha256"
"encoding/hex"
"io"
"io/ioutil"
"os"
"os/exec"
"strings"
)
// run wraps `exec.Command` with easy access to stdout and stderr.
func run(stdout, stderr io.Writer, cmd string, args ...string) error {
c := exec.Command(cmd, args...)
c.Stdin = os.Stdin
c.Stdout = stdout
c.Stderr = stderr
return c.Run()
}
// protect calculates HMAC-SHA256 of the application ID, keyed by the machine ID and returns a hex-encoded string.
func protect(appID, id string) string {
mac := hmac.New(sha256.New, []byte(id))
mac.Write([]byte(appID))
return hex.EncodeToString(mac.Sum(nil))
}
func readFile(filename string) ([]byte, error) {
return ioutil.ReadFile(filename)
}
func trim(s string) string {
return strings.TrimSpace(strings.Trim(s, "\n"))
}
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