private void ReadHeader(long volumeHeaderOffset)
{
long volumeHeaderSectorIndex = volumeHeaderOffset / m_volume.BytesPerSector;
byte[] headerBytes = m_volume.ReadSector(volumeHeaderSectorIndex);
m_header = new TrueCryptHeader(headerBytes, m_password);
}
/// <summary>
/// Extend the partition and TrueCrypt volume
/// </summary>
public static TrueCryptResizeStatus ExtendVolume(Disk disk, byte[] password, long additionalNumberOfSectors)
{
Partition partition = VolumeSelectionHelper.GetLastPartition(disk);
TrueCryptVolume volume;
try
{
volume = new TrueCryptVolume(partition, password);
}
catch (InvalidDataException)
{
return(TrueCryptResizeStatus.InvalidDisk);
}
catch (NotSupportedException)
{
return(TrueCryptResizeStatus.UnsupportedFormatVersion);
}
if (volume.IsHiddenVolume)
{
return(TrueCryptResizeStatus.HiddenVolume);
}
long availableBytes;
if (partition is MBRPartition || partition is GPTPartition)
{
availableBytes = ExtendHelper.GetMaximumSizeToExtendPartition(partition);
}
else // Removable volume
{
availableBytes = additionalNumberOfSectors * volume.BytesPerSector;
}
TrueCryptHeader header = volume.Header;
long oldBackupHeaderOffset = (long)(header.MasterKeyScopeOffset + header.MasterKeyEncryptedAreaSize);
long newBackupHeaderOffset = (long)(header.MasterKeyScopeOffset + header.MasterKeyEncryptedAreaSize + (ulong)availableBytes);
header.MasterKeyEncryptedAreaSize += (ulong)availableBytes;
header.VolumeSize += (ulong)availableBytes;
byte[] headerBytes = header.GetBytes(password);
// Read backup header group from old end of the partition
byte[] backupHeaderGroupBytes = partition.ReadSectors(oldBackupHeaderOffset / disk.BytesPerSector, TrueCryptVolume.VolumeHeaderGroupLength / disk.BytesPerSector);
// Updated the backup header (using the stored salt)
header.Salt = ByteReader.ReadBytes(backupHeaderGroupBytes, 0, 64);
byte[] backupHeaderBytes = header.GetBytes(password);
Array.Copy(backupHeaderBytes, 0, backupHeaderGroupBytes, 0, backupHeaderBytes.Length);
if (partition is MBRPartition || partition is GPTPartition)
{
long availableSectors = availableBytes / disk.BytesPerSector;
ExtendHelper.ExtendPartition((Partition)partition, availableSectors);
// Reinitialize the partition
partition = VolumeSelectionHelper.GetLastPartition(disk);
}
// Write backup header to the new end of the partition
partition.WriteSectors(newBackupHeaderOffset / disk.BytesPerSector, backupHeaderGroupBytes);
// Destroy the old backup header (to prevent decryption of the volume after the password has changed)
byte[] temp = new byte[TrueCryptVolume.VolumeHeaderGroupLength];
new Random().NextBytes(temp);
partition.WriteSectors(oldBackupHeaderOffset / disk.BytesPerSector, temp);
// Write an updated header
partition.WriteSectors(0, headerBytes);
return(TrueCryptResizeStatus.Success);
}