private static void Decrypt(byte[] target, int targetOffset,
byte[] source, int sourceOffset, int length,
ref DecryptContext ctx)
{
int si = sourceOffset;
int ti = targetOffset;
for (int i = 0; i < length; i++, si++, ti++)
{
var p = (byte)(source[si] ^ ctx.Key);
ctx.Hash ^= p << ((ctx.Index % 4) * 8);
target[ti] = p;
ctx.Index += 1;
}
}
public object Deserialize(Stream stream)
{
var p = new Packet();
var intBytes = new byte[4];
// Read Len and Checksum
var startPos = stream.Position;
int len = stream.Read32BitEncodedInt();
int hash = stream.Read32BitEncodedInt();
// Decrypt and Check Chcksum
ArraySegment <byte> s0, s1;
GetBuffers(stream, (int)startPos + 8, len - 4, out s0, out s1);
var ctx = new DecryptContext {
Key = _deserializeWrapKey
};
Decrypt(s0.Array, s0.Offset, s0.Array, s0.Offset, s0.Count, ref ctx);
Decrypt(s1.Array, s1.Offset, s1.Array, s1.Offset, s1.Count, ref ctx);
if (ctx.Hash != hash)
{
throw new IOException("Hash mismatch");
}
if (_deserializeWrapKey != 0)
{
_deserializeWrapKey += 1;
if (_deserializeWrapKey == 0)
{
_deserializeWrapKey = 1;
}
}
// Read PacketType, ActorId, RequestId
var header = stream.ReadByte();
p.Type = (PacketType)(header & 0x0F);
p.ActorId = stream.Read7BitEncodedInt();
p.RequestId = stream.Read7BitEncodedInt();
// Read Message
if ((header & 0x80) != 0)
{
if (p.Type == PacketType.System)
{
p.Message = stream.ReadString();
}
else
{
var messageTypeAlias = stream.Read7BitEncodedInt();
var messageLen = stream.Read32BitEncodedInt();
Type type = _data.TypeTable.GetType(messageTypeAlias);
if (type == null)
{
throw new Exception("Cannot resolve message type. TypeAlias=" + messageTypeAlias);
}
p.Message = Activator.CreateInstance(type);
_data.MessageSerializer.Deserialize(stream, p.Message, type, messageLen);
}
}
// Read Exception
if ((header & 0x40) != 0)
{
p.Exception = _exceptionSerializer.Deserialize(stream);
}
var consumedLen = (int)(stream.Position - startPos);
if (len + 4 != consumedLen)
{
throw new Exception("Mismatched length: " + (len + 4) + " " + consumedLen);
}
return(p);
}
private static void Decrypt(byte[] target, int targetOffset,
byte[] source, int sourceOffset, int length,
ref DecryptContext ctx)
{
int si = sourceOffset;
int ti = targetOffset;
for (int i = 0; i < length; i++, si++, ti++)
{
var p = (byte)(source[si] ^ ctx.Key);
ctx.Hash ^= p << ((ctx.Index % 4) * 8);
target[ti] = p;
ctx.Index += 1;
}
}
unsafe DumpedMethod decryptMethod(uint token)
{
if (!canDecryptMethods())
{
throw new ApplicationException("Can't decrypt methods since compileMethod() isn't hooked yet");
}
ctx = new DecryptContext();
ctx.dm = new DumpedMethod();
ctx.dm.token = token;
ctx.method = monoModule.LookupToken((int)token) as MethodDefinition;
if (ctx.method == null)
{
throw new ApplicationException(string.Format("Could not find method {0:X8}", token));
}
byte *mh = (byte *)hInstModule + ctx.method.RVA;
byte *code;
if (mh == (byte *)hInstModule)
{
ctx.dm.mhMaxStack = 0;
ctx.dm.mhCodeSize = 0;
ctx.dm.mhFlags = 0;
ctx.dm.mhLocalVarSigTok = 0;
code = null;
}
else if ((*mh & 3) == 2)
{
uint headerSize = 1;
ctx.dm.mhMaxStack = 8;
ctx.dm.mhCodeSize = (uint)(*mh >> 2);
ctx.dm.mhFlags = 2;
ctx.dm.mhLocalVarSigTok = 0;
code = mh + headerSize;
}
else
{
uint headerSize = (uint)((mh[1] >> 4) * 4);
ctx.dm.mhMaxStack = *(ushort *)(mh + 2);
ctx.dm.mhCodeSize = *(uint *)(mh + 4);
ctx.dm.mhFlags = *(ushort *)mh;
ctx.dm.mhLocalVarSigTok = *(uint *)(mh + 8);
code = mh + headerSize;
}
CORINFO_METHOD_INFO info = default(CORINFO_METHOD_INFO);
info.ILCode = new IntPtr(code);
info.ILCodeSize = ctx.dm.mhCodeSize;
info.maxStack = ctx.dm.mhMaxStack;
info.scope = moduleToDecryptScope;
initializeOurComp();
if (code == null)
{
ctx.dm.code = new byte[0];
updateFromMethodDefTableRow();
}
else
{
callMethodDelegate(*(IntPtr *)jitterVtbl, jitterInstance, ourCompMem, new IntPtr(&info), 0, new IntPtr(0x12345678), new IntPtr(0x3ABCDEF0));
}
var dm = ctx.dm;
ctx = null;
return(dm);
}
public object Deserialize(Stream stream)
{
var p = new Packet();
var intBytes = new byte[4];
// Read Len and Checksum
var startPos = stream.Position;
int len = stream.Read32BitEncodedInt();
int hash = stream.Read32BitEncodedInt();
// Decrypt and Check Chcksum
ArraySegment<byte> s0, s1;
GetBuffers(stream, (int)startPos + 8, len - 4, out s0, out s1);
var ctx = new DecryptContext { Key = _deserializeWrapKey };
Decrypt(s0.Array, s0.Offset, s0.Array, s0.Offset, s0.Count, ref ctx);
Decrypt(s1.Array, s1.Offset, s1.Array, s1.Offset, s1.Count, ref ctx);
if (ctx.Hash != hash)
throw new IOException("Hash mismatch");
if (_deserializeWrapKey != 0)
{
_deserializeWrapKey += 1;
if (_deserializeWrapKey == 0)
_deserializeWrapKey = 1;
}
// Read PacketType, ActorId, RequestId
var header = stream.ReadByte();
p.Type = (PacketType)(header & 0x0F);
p.ActorId = stream.Read7BitEncodedInt();
p.RequestId = stream.Read7BitEncodedInt();
// Read Message
if ((header & 0x80) != 0)
{
if (p.Type == PacketType.System)
{
p.Message = stream.ReadString();
}
else
{
var messageTypeAlias = stream.Read7BitEncodedInt();
var messageLen = stream.Read32BitEncodedInt();
Type type = _data.TypeTable.GetType(messageTypeAlias);
if (type == null)
throw new Exception("Cannot resolve message type. TypeAlias=" + messageTypeAlias);
p.Message = Activator.CreateInstance(type);
_data.MessageSerializer.Deserialize(stream, p.Message, type, messageLen);
}
}
// Read Exception
if ((header & 0x40) != 0)
{
p.Exception = _exceptionSerializer.Deserialize(stream);
}
var consumedLen = (int)(stream.Position - startPos);
if (len + 4 != consumedLen)
throw new Exception("Mismatched length: " + (len + 4) + " " + consumedLen);
return p;
}
