public void EncryptNativeMethods(ModuleWriterBase moduleWriter)
{
if (validNativeMethods == null || validNativeMethods.Count == 0)
{
return;
}
Logger.v("Encrypting native methods");
var stream = new MemoryStream();
var writer = new BinaryWriter(stream);
writer.Write((uint)0); // patch count
writer.Write((uint)0); // mode
writer.Write(validNativeMethods.Count);
int index = 0;
foreach (var method in validNativeMethods)
{
var code = methodToNativeMethod[method];
var mb = moduleWriter.MetaData.GetMethodBody(method);
if (mb == null)
{
Logger.e("Could not find method body for method {0} ({1:X8})", method, method.MDToken.Raw);
continue;
}
uint codeRva = (uint)mb.RVA;
if (mb.IsTiny)
{
codeRva++;
}
else
{
codeRva += (uint)(4 * (mb.Code[1] >> 4));
}
Logger.v("Native method {0:X8}, code RVA {1:X8}", new MDToken(Table.Method, moduleWriter.MetaData.GetRid(method)).Raw, codeRva);
writer.Write(codeRva);
writer.Write(0x70000000 + index++);
writer.Write(code.Length);
writer.Write(code);
}
if (index != 0)
{
Logger.n("Re-encrypted {0}/{1} native methods", index, totalEncryptedNativeMethods);
}
var resourceChunk = moduleWriter.MetaData.GetChunk(encryptedResource.Resource);
var resourceData = resourceChunk.Data;
var encrypted = stream.ToArray();
XorEncrypt(encrypted);
encrypted = encryptedResource.Encrypt(encrypted);
if (encrypted.Length != resourceData.Length)
{
Logger.e("Encrypted native methods array is not same size as original array");
}
Array.Copy(encrypted, resourceData, resourceData.Length);
}