public Aes128CtrExStorage(IStorage baseStorage, IStorage bucketTreeHeader, IStorage bucketTreeData, byte[] key, long counterOffset, byte[] ctrHi, bool leaveOpen)
: base(baseStorage, key, counterOffset, ctrHi, leaveOpen)
{
BucketTree = new BucketTree <AesSubsectionEntry>(bucketTreeHeader, bucketTreeData);
SubsectionEntries = BucketTree.GetEntryList();
SubsectionOffsets = SubsectionEntries.Select(x => x.Offset).ToList();
}
public BktrCryptoStream(Stream baseStream, byte[] key, long offset, long length, long counterOffset, byte[] ctrHi, BktrSuperblock bktr)
: base(baseStream, key, offset, length, counterOffset, ctrHi)
{
BktrHeader header = bktr.SubsectionHeader;
byte[] subsectionBytes;
using (var streamDec = new RandomAccessSectorStream(new Aes128CtrStream(baseStream, key, offset, length, counterOffset, ctrHi)))
{
streamDec.Position = header.Offset;
subsectionBytes = new byte[header.Size];
streamDec.Read(subsectionBytes, 0, subsectionBytes.Length);
}
using (var reader = new BinaryReader(new MemoryStream(subsectionBytes)))
{
SubsectionBlock = new SubsectionBlock(reader);
}
foreach (SubsectionBucket bucket in SubsectionBlock.Buckets)
{
SubsectionEntries.AddRange(bucket.Entries);
}
// Add a subsection for the BKTR headers to make things easier
var headerSubsection = new SubsectionEntry
{
Offset = bktr.RelocationHeader.Offset,
Counter = (uint)(ctrHi[4] << 24 | ctrHi[5] << 16 | ctrHi[6] << 8 | ctrHi[7]),
OffsetEnd = long.MaxValue
};
SubsectionEntries.Add(headerSubsection);
for (int i = 0; i < SubsectionEntries.Count - 1; i++)
{
SubsectionEntries[i].Next = SubsectionEntries[i + 1];
SubsectionEntries[i].OffsetEnd = SubsectionEntries[i + 1].Offset;
}
SubsectionOffsets = SubsectionEntries.Select(x => x.Offset).ToList();
CurrentEntry = GetSubsectionEntry(0);
UpdateCounterSubsection(CurrentEntry.Counter);
baseStream.Position = offset;
}
