read and write file func added

main.go

@@ -46,6 +46,19 @@ func decrypt(sealed []byte, key []byte) []byte {
   return data
 }
 
+func file2data(filename string) []byte {
+  data, err := ioutil.ReadFile(filename)
+  checkErr(err)
+  return data
+}
+
+func data2file(filename string, data []byte) {
+  f, err := os.Create(filename)
+  checkErr(err)
+  defer f.Close()
+  f.Write(data)
+}
+
 func main() {
   var passwd string = "ThisAnnPassphrase"
   fmt.Println(passwd)