simple xor string data

macho-go/pkg/ios/macho/edit.go

@@ -772,7 +772,11 @@ func (mc *MachoContext) RemoveStrings() {
   // this is a way to divert their effort, writing fake strings
   // will be written again at runtime
   dummy := make([]byte, edit_segment.Fileoff() - string_segment.Fileoff())
-  copy(dummy, []byte("We R BShield\n"))
+  mc.file.ReadAt(dummy, int64(cstring.Offset()))
+  // copy(dummy, []byte("We R BShield\n"))
+  for i := 0; i < len(dummy); i++ {
+    dummy[i] = dummy[i] ^ 0x4f
+  }
   mc.file.WriteAt(dummy, int64(string_segment.Fileoff()))
 
   // TODO: erase old strings