package contentenc import ( "testing" "github.com/rfjakob/gocryptfs/internal/cryptocore" ) type testRange struct { offset uint64 length uint64 } func TestSplitRange(t *testing.T) { var ranges []testRange ranges = append(ranges, testRange{0, 70000}, testRange{0, 10}, testRange{234, 6511}, testRange{65444, 54}, testRange{0, 1024 * 1024}, testRange{0, 65536}, testRange{6654, 8945}) key := make([]byte, cryptocore.KeyLen) cc := cryptocore.New(key, cryptocore.BackendGoGCM, DefaultIVBits, true, false) f := New(cc, DefaultBS, false) for _, r := range ranges { parts := f.ExplodePlainRange(r.offset, r.length) var lastBlockNo uint64 = 1 << 63 for _, p := range parts { if p.BlockNo == lastBlockNo { t.Errorf("Duplicate block number %d", p.BlockNo) } lastBlockNo = p.BlockNo if p.Length > DefaultBS || p.Skip >= DefaultBS { t.Errorf("Test fail: n=%d, length=%d, offset=%d\n", p.BlockNo, p.Length, p.Skip) } } } } func TestCiphertextRange(t *testing.T) { var ranges []testRange ranges = append(ranges, testRange{0, 70000}, testRange{0, 10}, testRange{234, 6511}, testRange{65444, 54}, testRange{6654, 8945}) key := make([]byte, cryptocore.KeyLen) cc := cryptocore.New(key, cryptocore.BackendGoGCM, DefaultIVBits, true, false) f := New(cc, DefaultBS, false) for _, r := range ranges { blocks := f.ExplodePlainRange(r.offset, r.length) alignedOffset, alignedLength := blocks[0].JointCiphertextRange(blocks) skipBytes := blocks[0].Skip if alignedLength < r.length { t.Errorf("alignedLength=%d is smaller than length=%d", alignedLength, r.length) } if (alignedOffset-HeaderLen)%f.cipherBS != 0 { t.Errorf("alignedOffset=%d is not aligned", alignedOffset) } if r.offset%f.plainBS != 0 && skipBytes == 0 { t.Errorf("skipBytes=0") } } } func TestBlockNo(t *testing.T) { key := make([]byte, cryptocore.KeyLen) cc := cryptocore.New(key, cryptocore.BackendGoGCM, DefaultIVBits, true, false) f := New(cc, DefaultBS, false) b := f.CipherOffToBlockNo(788) if b != 0 { t.Errorf("actual: %d", b) } b = f.CipherOffToBlockNo(HeaderLen + f.cipherBS) if b != 1 { t.Errorf("actual: %d", b) } b = f.PlainOffToBlockNo(788) if b != 0 { t.Errorf("actual: %d", b) } b = f.PlainOffToBlockNo(f.plainBS) if b != 1 { t.Errorf("actual: %d", b) } }