Add "--zerokey" option to simplify testing and benchmarking

main.go

@@ -66,8 +66,10 @@ func main() {
 	// Parse command line arguments
 	var debug bool
 	var init bool
+	var zerokey bool
 	flag.BoolVar(&debug, "debug", false, "Enable debug output")
 	flag.BoolVar(&init, "init", false, "Initialize encrypted directory")
+	flag.BoolVar(&zerokey, "zerokey", false, "Use all-zero dummy master key")
 	flag.Parse()
 	if debug {
 		cryptfs.Debug.Enable()
@@ -81,7 +83,7 @@ func main() {
 		initDir(flag.Arg(0))
 	}
 	if flag.NArg() < 2 {
-		fmt.Printf("usage: %s CIPHERDIR MOUNTPOINT\n", PROGRAM_NAME)
+		fmt.Printf("usage: %s [OPTIONS] CIPHERDIR MOUNTPOINT\n", PROGRAM_NAME)
 		os.Exit(ERREXIT_USAGE)
 	}
 	cipherdir, _ := filepath.Abs(flag.Arg(0))
@@ -94,6 +96,11 @@ func main() {
 		os.Exit(ERREXIT_CIPHERDIR)
 	}
 
+	key := make([]byte, cryptfs.KEY_LEN)
+	if zerokey {
+		fmt.Printf("Zerokey mode active: using all-zero dummy master key.\n")
+		fmt.Printf("ZEROKEY MODE PROVIDES NO SECURITY AT ALL.\n")
+	} else {
 		cfname := filepath.Join(cipherdir, cryptfs.ConfDefaultName)
 		_, err = os.Stat(cfname)
 		if err != nil {
@@ -101,17 +108,17 @@ func main() {
 			fmt.Printf("Please run \"%s --init %s\" first\n", PROGRAM_NAME, flag.Arg(0))
 			os.Exit(ERREXIT_LOADCONF)
 		}
-
 		fmt.Printf("Password: ")
 		password := readPassword()
 		fmt.Printf("\nDecrypting master key... ")
-	key, err := cryptfs.LoadConfFile(cfname, password)
+		key, err = cryptfs.LoadConfFile(cfname, password)
 		if err != nil {
 			fmt.Println(err)
 			os.Exit(ERREXIT_LOADCONF)
 		}
 		fmt.Printf("Success\n")
 		printMasterKey(key)
+	}
 
 	if USE_CLUEFS {
 		cluefsFrontend(key, cipherdir, mountpoint)

main_test.go

@@ -34,7 +34,7 @@ func TestMain(m *testing.M) {
 		panic("Could not create cipherDir")
 	}
 
-	c := exec.Command("./gocryptfs", cipherDir, plainDir)
+	c := exec.Command("./gocryptfs", "--zerokey", cipherDir, plainDir)
 	c.Stdout = os.Stdout
 	c.Stderr = os.Stderr
 	go c.Run()