static void Read(IO.EndianReader s, bool decrypt, IO.IEndianStreamable obj,
long size = 0, ulong userKey = 0, Action <IO.EndianReader> readLeftovers = null)
{
if (!decrypt)
{
obj.Read(s);
}
else
{
using (var ms = new System.IO.MemoryStream())
using (var sout = new IO.EndianWriter(ms, Shell.EndianFormat.Big))
using (var decrypted = new IO.EndianReader(ms, Shell.EndianFormat.Big))
{
long position = s.BaseStream.Position;
var tea = new Security.Cryptography.PhxTEA(s, sout);
tea.InitializeKey(Security.Cryptography.PhxTEA.kKeyGameFile, userKey);
tea.Decrypt(size);
decrypted.Seek(0);
obj.Read(decrypted);
if (readLeftovers != null)
{
readLeftovers(decrypted);
}
}
}
}
static void Stream(IO.EndianStream s, bool crypt, IO.IEndianStreamSerializable obj,
long size = 0, ulong userKey = 0, Action <IO.EndianStream> streamLeftovers = null)
{
if (!crypt)
{
obj.Serialize(s);
if (s.IsWriting && streamLeftovers != null)
{
streamLeftovers(s);
}
}
else
{
using (var ms = new System.IO.MemoryStream())
using (var crypted = new IO.EndianStream(ms, s.ByteOrder))
{
crypted.StreamMode = s.StreamMode;
if (s.IsReading)
{
var tea = new Security.Cryptography.PhxTEA(s.Reader, crypted.Writer);
tea.InitializeKey(Security.Cryptography.PhxTEA.kKeyGameFile, userKey);
tea.Decrypt(size);
crypted.Seek(0);
}
obj.Serialize(crypted);
if (streamLeftovers != null)
{
streamLeftovers(crypted);
}
if (s.IsWriting)
{
crypted.Seek(0);
var tea = new Security.Cryptography.PhxTEA(crypted.Reader, s.Writer);
tea.InitializeKey(Security.Cryptography.PhxTEA.kKeyGameFile, userKey);
tea.Encrypt(size);
}
}
}
}
public static void CryptStream(IO.EndianReader input, IO.EndianWriter output, CryptographyTransformType transformType)
{
Contract.Requires(input != null);
Contract.Requires(output != null);
// This should be OK because PhxTEA is buffered
//Contract.Requires(input.BaseStream != output.BaseStream);
var tea = new Security.Cryptography.PhxTEA(input, output);
tea.InitializeKey(Security.Cryptography.PhxTEA.kKeyEra);
switch (transformType)
{
case CryptographyTransformType.Decrypt:
tea.Decrypt();
break;
case CryptographyTransformType.Encrypt:
tea.Encrypt();
break;
}
}