Add secure byte slice erase helper; add alternative input methods for Windows

back/security.go

@@ -0,0 +1,9 @@
+package back
+
+// EraseBytesSecurely overwrites all
+// bytes in a slice with zeros.
+func EraseBytesSecurely(input []byte) {
+	for i := range input {
+		input[i] = 0
+	}
+}