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| 1 | package seal |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "testing" |
| 6 | ) |
| 7 | |
| 8 | func testDEK() []byte { |
| 9 | d := make([]byte, 32) |
| 10 | for i := range d { |
| 11 | d[i] = byte(i) |
| 12 | } |
| 13 | return d |
| 14 | } |
| 15 | |
| 16 | func TestSealOpenRoundTrip(t *testing.T) { |
| 17 | s, err := New(testDEK()) |
| 18 | if err != nil { |
| 19 | t.Fatal(err) |
| 20 | } |
| 21 | want := []byte("=SUM(A1:A10)") |
| 22 | ct, err := s.Seal("cell.input", want) |
| 23 | if err != nil { |
| 24 | t.Fatal(err) |
| 25 | } |
| 26 | if bytes.Contains(ct, want) { |
| 27 | t.Fatal("ciphertext contains the plaintext") |
| 28 | } |
| 29 | got, err := s.Open("cell.input", ct) |
| 30 | if err != nil { |
| 31 | t.Fatal(err) |
| 32 | } |
| 33 | if !bytes.Equal(got, want) { |
| 34 | t.Fatalf("Open = %q, want %q", got, want) |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | // A value sealed under one purpose must not open under another. Purpose |
| 39 | // separation is what stops a cached value being swapped for an input. |
| 40 | func TestPurposeSeparation(t *testing.T) { |
| 41 | s, _ := New(testDEK()) |
| 42 | ct, _ := s.Seal("cell.input", []byte("secret")) |
| 43 | if _, err := s.Open("cell.cached", ct); err == nil { |
| 44 | t.Fatal("opened under the wrong purpose") |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | func TestRejectsShortDEK(t *testing.T) { |
| 49 | if _, err := New([]byte("too short")); err == nil { |
| 50 | t.Fatal("accepted a short DEK") |
| 51 | } |
| 52 | } |
| 53 | |
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