Add test for decrypting

crypto_test.go

@@ -30,6 +30,26 @@ func ExampleBase64encode() {
 	// Output: U1VDQ0VTUw==
 }
 
+func TestDecrypt(t *testing.T) {
+	// This test makes sure that we don't brake backwards compatibility
+	// by modifying both; encrypt and decrypt at the same time.
+	const passwd = "mypass"
+	var (
+		encryptedInput = []byte{
+			0xf2, 0x3, 0x92, 0x1f, 0x9b, 0xb4, 0x56, 0xc,
+			0x37, 0xb4, 0x33, 0x5f, 0x1, 0xad, 0xe3, 0x66,
+			0x99, 0x14, 0x3e, 0x59, 0xc9, 0x19, 0xfe, 0x3b,
+			0x6f, 0x34, 0xd2, 0xd9, 0x80, 0xe7, 0x1f, 0x2f,
+			0xf2, 0x15, 0xb1, 0x4, 0x3e,
+		}
+		expectedOutput = []byte("some data")
+	)
+
+	data, err := Decrypt(encryptedInput, passwd)
+	require.NoError(t, err)
+	require.Equal(t, expectedOutput, data)
+}
+
 func TestEncryptDecrypt(t *testing.T) {
 	const (
 		input  = "supersecret"