void InjectStub(ConfuserContext context, CompressorContext compCtx, ProtectionParameters parameters, ModuleDef stubModule)
{
var rt = context.Registry.GetService <IRuntimeService>();
RandomGenerator random = context.Registry.GetService <IRandomService>().GetRandomGenerator(Id);
var comp = context.Registry.GetService <ICompressionService>();
IEnumerable <IDnlibDef> defs = InjectHelper.Inject(rt.GetRuntimeType("Confuser.Runtime.Compressor"), stubModule.GlobalType, stubModule);
switch (parameters.GetParameter(context, context.CurrentModule, "key", Mode.Normal))
{
case Mode.Normal:
compCtx.Deriver = new NormalDeriver();
break;
case Mode.Dynamic:
compCtx.Deriver = new DynamicDeriver();
break;
default:
throw new UnreachableException();
}
compCtx.Deriver.Init(context, random);
context.Logger.Debug("Encrypting modules...");
// Main
MethodDef entryPoint = defs.OfType <MethodDef>().Single(method => method.Name == "Main");
stubModule.EntryPoint = entryPoint;
uint seed = random.NextUInt32();
compCtx.OriginModule = context.OutputModules[compCtx.ModuleIndex];
byte[] encryptedModule = compCtx.Encrypt(comp, compCtx.OriginModule, seed,
progress => context.Logger.Progress((int)(progress * 10000), 10000));
context.Logger.EndProgress();
context.CheckCancellation();
compCtx.EncryptedModule = encryptedModule;
MutationHelper.InjectKeys(entryPoint,
new[] { 0, 1 },
new[] { encryptedModule.Length >> 2, (int)seed });
InjectData(stubModule, entryPoint, encryptedModule);
// Decrypt
MethodDef decrypter = defs.OfType <MethodDef>().Single(method => method.Name == "Decrypt");
decrypter.Body.SimplifyMacros(decrypter.Parameters);
List <Instruction> instrs = decrypter.Body.Instructions.ToList();
for (int i = 0; i < instrs.Count; i++)
{
Instruction instr = instrs[i];
if (instr.OpCode == OpCodes.Call)
{
var method = (IMethod)instr.Operand;
if (method.DeclaringType.Name == "Mutation" &&
method.Name == "Crypt")
{
Instruction ldDst = instrs[i - 2];
Instruction ldSrc = instrs[i - 1];
Debug.Assert(ldDst.OpCode == OpCodes.Ldloc && ldSrc.OpCode == OpCodes.Ldloc);
instrs.RemoveAt(i);
instrs.RemoveAt(i - 1);
instrs.RemoveAt(i - 2);
instrs.InsertRange(i - 2, compCtx.Deriver.EmitDerivation(decrypter, context, (Local)ldDst.Operand, (Local)ldSrc.Operand));
}
else if (method.DeclaringType.Name == "Lzma" &&
method.Name == "Decompress")
{
MethodDef decomp = comp.GetRuntimeDecompressor(stubModule, member => { });
instr.Operand = decomp;
}
}
}
decrypter.Body.Instructions.Clear();
foreach (Instruction instr in instrs)
{
decrypter.Body.Instructions.Add(instr);
}
// Pack modules
PackModules(context, compCtx, stubModule, comp, random);
}
public KeyInjector(CompressorContext ctx)
{
this.ctx = ctx;
}
void PackModules(ConfuserContext context, CompressorContext compCtx, ModuleDef stubModule, ICompressionService comp, RandomGenerator random)
{
int maxLen = 0;
var modules = new Dictionary <string, byte[]>();
for (int i = 0; i < context.OutputModules.Count; i++)
{
if (i == compCtx.ModuleIndex)
{
continue;
}
string fullName = context.Modules[i].Assembly.FullName;
modules.Add(fullName, context.OutputModules[i]);
int strLen = Encoding.UTF8.GetByteCount(fullName);
if (strLen > maxLen)
{
maxLen = strLen;
}
}
foreach (var extModule in context.ExternalModules)
{
var fullName = GetFullName(extModule);
modules.Add(fullName, extModule);
int strLen = Encoding.UTF8.GetByteCount(fullName);
if (strLen > maxLen)
{
maxLen = strLen;
}
}
byte[] key = random.NextBytes(4 + maxLen);
key[0] = (byte)(compCtx.EntryPointToken >> 0);
key[1] = (byte)(compCtx.EntryPointToken >> 8);
key[2] = (byte)(compCtx.EntryPointToken >> 16);
key[3] = (byte)(compCtx.EntryPointToken >> 24);
for (int i = 4; i < key.Length; i++) // no zero bytes
{
key[i] |= 1;
}
compCtx.KeySig = key;
int moduleIndex = 0;
foreach (var entry in modules)
{
byte[] name = Encoding.UTF8.GetBytes(entry.Key);
for (int i = 0; i < name.Length; i++)
{
name[i] *= key[i + 4];
}
uint state = 0x6fff61;
foreach (byte chr in name)
{
state = state * 0x5e3f1f + chr;
}
byte[] encrypted = compCtx.Encrypt(comp, entry.Value, state, progress => {
progress = (progress + moduleIndex) / modules.Count;
context.Logger.Progress((int)(progress * 10000), 10000);
});
context.CheckCancellation();
var resource = new EmbeddedResource(Convert.ToBase64String(name), encrypted, ManifestResourceAttributes.Private);
stubModule.Resources.Add(resource);
moduleIndex++;
}
context.Logger.EndProgress();
}
public CompressorQueryFacade(CompressorContext context)
{
_context = context;
}
