c, err := des.NewCipher(key)
	if err != nil {
		panic("NewCipher failed: " + err.Error())
	}
	return c
}

// Use the known weak keys to test DES implementation
func TestWeakKeys(t *testing.T) {
	for i, tt := range weakKeyTests {
		var encrypt = func(in []byte) (out []byte) {
			c := newCipher(tt.key)
			out = make([]byte, len(in))
			c.Encrypt(out, in)
			return
		}