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package contentenc
import (
"testing"
"github.com/rfjakob/gocryptfs/v2/internal/cryptocore"
)
type testRange struct {
offset uint64
length uint64
}
func TestSplitRange(t *testing.T) {
ranges := []testRange{
{0, 70000},
{0, 10},
{234, 6511},
{65444, 54},
{0, 1024 * 1024},
{0, 65536},
{6654, 8945},
}
key := make([]byte, cryptocore.KeyLen)
cc := cryptocore.New(key, cryptocore.BackendGoGCM, DefaultIVBits, true)
f := New(cc, DefaultBS)
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) {
ranges := []testRange{
{0, 70000},
{0, 10},
{234, 6511},
{65444, 54},
{6654, 8945},
}
key := make([]byte, cryptocore.KeyLen)
cc := cryptocore.New(key, cryptocore.BackendGoGCM, DefaultIVBits, true)
f := New(cc, DefaultBS)
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)
f := New(cc, DefaultBS)
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)
}
}
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