static MemoryStream Decrypt(uint[] h, Blowfish fish)
{
var decrypted = fish.Decrypt(h);
var ms = new MemoryStream();
var writer = new BinaryWriter(ms);
foreach (var t in decrypted)
{
writer.Write(t);
}
writer.Flush();
ms.Seek(0, SeekOrigin.Begin);
return(ms);
}
MemoryStream DecryptHeader(Stream s, long offset, out long headerEnd)
{
s.Seek(offset, SeekOrigin.Begin);
// Decrypt blowfish key
var keyblock = s.ReadBytes(80);
var blowfishKey = new BlowfishKeyProvider().DecryptKey(keyblock);
var fish = new Blowfish(blowfishKey);
// Decrypt first block to work out the header length
var ms = Decrypt(ReadBlocks(s, offset + 80, 1), fish);
var numFiles = ms.ReadUInt16();
// Decrypt the full header - round bytes up to a full block
var blockCount = (13 + numFiles * PackageEntry.Size) / 8;
headerEnd = offset + 80 + blockCount * 8;
return(Decrypt(ReadBlocks(s, offset + 80, blockCount), fish));
}
List<PackageEntry> ParseRaHeader(Stream s, out long dataStart)
{
BinaryReader reader = new BinaryReader(s);
byte[] keyblock = reader.ReadBytes(80);
byte[] blowfishKey = new BlowfishKeyProvider().DecryptKey(keyblock);
uint[] h = ReadUints(reader, 2);
Blowfish fish = new Blowfish(blowfishKey);
MemoryStream ms = Decrypt( h, fish );
BinaryReader reader2 = new BinaryReader(ms);
ushort numFiles = reader2.ReadUInt16();
reader2.ReadUInt32(); /*datasize*/
s.Position = headerStart;
reader = new BinaryReader(s);
int byteCount = 6 + numFiles * PackageEntry.Size;
h = ReadUints( reader, ( byteCount + 3 ) / 4 );
ms = Decrypt( h, fish );
dataStart = headerStart + byteCount + ( ( ~byteCount + 1 ) & 7 );
long ds;
return ParseTdHeader( ms, out ds );
}
static MemoryStream Decrypt( uint[] h, Blowfish fish )
{
uint[] decrypted = fish.Decrypt( h );
MemoryStream ms = new MemoryStream();
BinaryWriter writer = new BinaryWriter( ms );
foreach( uint t in decrypted )
writer.Write( t );
writer.Flush();
ms.Position = 0;
return ms;
}
MemoryStream DecryptHeader(Stream s, long offset, out long headerEnd)
{
s.Seek(offset, SeekOrigin.Begin);
var reader = new BinaryReader(s);
// Decrypt blowfish key
var keyblock = reader.ReadBytes(80);
var blowfishKey = new BlowfishKeyProvider().DecryptKey(keyblock);
var fish = new Blowfish(blowfishKey);
// Decrypt first block to work out the header length
var ms = Decrypt(ReadBlocks(s, offset + 80, 1), fish);
var numFiles = new BinaryReader(ms).ReadUInt16();
// Decrypt the full header - round bytes up to a full block
var blockCount = (13 + numFiles*PackageEntry.Size)/8;
headerEnd = offset + 80 + blockCount*8;
return Decrypt(ReadBlocks(s, offset + 80, blockCount), fish);
}
static MemoryStream Decrypt(uint[] h, Blowfish fish)
{
var decrypted = fish.Decrypt(h);
var ms = new MemoryStream();
var writer = new BinaryWriter(ms);
foreach(var t in decrypted)
writer.Write(t);
writer.Flush();
ms.Seek(0, SeekOrigin.Begin);
return ms;
}
