public byte[] ToBufferEncryptBlock()
{
byte[] result = new byte[16];
CryptoRandom.GetBytes(result);
Buffer.BlockCopy(BitConverter.GetBytes(_InfSize), 0, result, 13, 2);
Buffer.BlockCopy(BitConverter.GetBytes((byte)ElType * 128 + (int)CryptoRandom.Random(128)), 0, result, 15, 1);
return(result);
}
public Header(SafeStreamAccess headersStream, AesCryptoServiceProvider AES, ElementType blockType)
{
_IV = new byte[16];
CryptoRandom.GetBytes(_IV);
_AES = AES;
_StartPos = (UInt64)headersStream.Length;
_Exists = true;
_ElType = blockType;
_headersFileStream = headersStream;
_InfSize = 0;
}
//Створення файлу вручну
public FileElement(DirElement parent, Header parentHeader, SafeStreamAccess dataFileStream, string Name, Stream fileStream, bool isCompressed,
Object addElementLocker, Object changeElementsLocker, Bitmap Icon = null, SafeStreamAccess.ProgressCallback Progress = null) : base(addElementLocker, changeElementsLocker)
{
lock (_addElementLocker)
{
UInt64 fileSize = (UInt64)fileStream.Length;
byte[] icon = GetIconBytes(Icon);
UInt32 iconSize = icon == null ? 0 : (UInt32)icon.Length;
UInt64 fileStartPos = dataFileStream.GetFreeSpaceStartPos(Crypto.GetMod16(fileSize)); //Вибираємо місце куди писати файл
UInt64 iconStartPos = dataFileStream.GetFreeSpaceStartPos(Crypto.GetMod16(iconSize)); //Вибираємо місце куди писати іконку
iconStartPos = (iconStartPos == fileStartPos) ? iconStartPos += Crypto.GetMod16(fileSize) : iconStartPos;
lock (dataFileStream.writeLock)
{
header = new Header(parentHeader.headersFileStream, parentHeader.AES, ElementType.File);
this.dataFileStream = dataFileStream;
_Name = Name;
_ParentID = parent.ID;
_FileStartPos = fileStartPos;
_FileSize = fileSize;
_IconStartPos = iconStartPos;
_IconSize = iconSize;
_IsCompressed = isCompressed;
_Hash = new byte[16];
CryptoRandom.GetBytes(_Hash);
_PHash = GetPHash(Icon);
SaveInf();
_Exists = false;
}
AesCryptoServiceProvider AES = GetFileAES(_FileIV);
if (fileSize > 0)
{
dataFileStream.WriteEncrypt((long)fileStartPos, fileStream, AES, out _Hash, Progress);
}
if ((icon != null) && (iconSize > 0))
{
AES.IV = _IconIV;
dataFileStream.WriteEncrypt((long)iconStartPos, icon, AES);
}
//Закидаємо файл в потрібну папку і записуємо зміни
_Exists = true;
ChangeParent(parent, true);
}
}
protected static byte[] GetPHash(Bitmap Icon)
{
if (Icon == null)
{
byte[] phash = new byte[8];
CryptoRandom.GetBytes(phash);
return(phash);
}
try
{
return(_GetPHash(Icon));
}
catch
{
return(GetPHash(null));
}
}
public void ChangeContent(Stream NewData, SafeStreamAccess.ProgressCallback Progress = null)
{
lock (_addElementLocker)
{
UInt64 fileSize = (UInt64)NewData.Length;
UInt64 fileStartPos = _FileStartPos;
if (fileSize >= Crypto.GetMod16(_FileSize))
{
fileStartPos = dataFileStream.GetFreeSpaceStartPos(Crypto.GetMod16(fileSize)); //Вибираємо місце куди писати файл
}
byte[] tempHash;
try
{
if (fileSize > 0)
{
AesCryptoServiceProvider AES = GetFileAES(_FileIV);
dataFileStream.WriteEncrypt((long)fileStartPos, NewData, AES, out tempHash, Progress);
}
else
{
tempHash = new byte[16];
CryptoRandom.GetBytes(tempHash);
}
}
catch
{
throw new DataWasNotWrittenException("Файл не записався.");
}
try
{
_FileStartPos = fileStartPos;
_FileSize = fileSize;
_Hash = tempHash;
SaveInf();
}
catch
{
throw new HeaderWasNotWrittenException("Інформація про зміни не записалась!");
}
}
}
public bool SaveInfo(byte[] info, int realLength)
{
CryptoRandom.GetBytes(info, realLength, info.Length - realLength);
lock (_headersFileStream.writeLock)
{
if (info.Length > _InfSize)
{
Delete();
_Exists = true;
_StartPos = (UInt64)_headersFileStream.Length;
_InfSize = (ushort)info.Length;
Save();
}
SetAESValue();
_headersFileStream.WriteEncrypt((long)(_StartPos + Length), info, AES);
}
return(true);
}
