Big rewrite tutk proto support

pkg/tutk/crypto_test.go

@@ -0,0 +1,14 @@
+package tutk
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestXXTEADecrypt(t *testing.T) {
+	buf := []byte("WERhJxb87WF3zgPa")
+	key := []byte("GAgDiwVPg2E4GMke")
+	XXTEADecrypt(buf, buf, key)
+	require.Equal(t, "\xc4\xa6\x2c\xa1\x10\x64\x17\xa5\xda\x02\xe1\x62\xa5\xf0\x62\x71", string(buf))
+}