How to obtain SSH passphrases (macOS High Sierra)

[nbari]

In macOS High Sierra (10.13.3) how could the ssh passphrases be obtained, currently trying with this without success:

    usr, _ := user.Current()
    dir := usr.HomeDir
    keyPath, err := filepath.Abs(filepath.Join(dir, ".ssh/id_rsa"))
    if err != nil {
            log.Fatal(err)
    }
    keyPassword, err := GetGenericPassword("SSH", keyPath, "", "")
    if err != nil {
            log.Fatal(err)
    }
    fmt.Printf("keyPassword = %s\n", keyPassword)

or also with:

    keyPassword, err := keychain.GetGenericPassword("OpenSSH", keyPath, "SSH: "+keyPath, "com.apple.ssh.passphrases")
    if err != nil {
            log.Fatal(err)
    }
    fmt.Printf("keyPassword = %s\n", keyPassword)

Any idea?

This seems to be related: https://apple.stackexchange.com/a/268175/104123