109 lines
4.5 KiB
C#
109 lines
4.5 KiB
C#
/*
|
|
Copyright (C) 2011 de4dot@gmail.com
|
|
|
|
This file is part of de4dot.
|
|
|
|
de4dot is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
de4dot is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with de4dot. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
using System;
|
|
using System.Collections.Generic;
|
|
using Mono.Cecil;
|
|
using Mono.Cecil.Cil;
|
|
using de4dot.blocks;
|
|
|
|
namespace de4dot.code.deobfuscators {
|
|
class InitializedDataCreator {
|
|
ModuleDefinition module;
|
|
Dictionary<long, TypeDefinition> sizeToArrayType = new Dictionary<long, TypeDefinition>();
|
|
TypeDefinition ourType;
|
|
TypeReference valueType;
|
|
int unique = 0;
|
|
MethodReference initializeArrayMethod;
|
|
|
|
public MethodReference InitializeArrayMethod {
|
|
get { return createInitializeArrayMethod(); }
|
|
}
|
|
|
|
public InitializedDataCreator(ModuleDefinition module) {
|
|
this.module = module;
|
|
}
|
|
|
|
MethodReference createInitializeArrayMethod() {
|
|
if (initializeArrayMethod == null) {
|
|
var runtimeHelpersType = DotNetUtils.findOrCreateTypeReference(module, module.TypeSystem.Corlib as AssemblyNameReference, "System.Runtime.CompilerServices", "RuntimeHelpers", false);
|
|
initializeArrayMethod = new MethodReference("InitializeArray", module.TypeSystem.Void, runtimeHelpersType);
|
|
var systemArrayType = DotNetUtils.findOrCreateTypeReference(module, module.TypeSystem.Corlib as AssemblyNameReference, "System", "Array", false);
|
|
var runtimeFieldHandleType = DotNetUtils.findOrCreateTypeReference(module, module.TypeSystem.Corlib as AssemblyNameReference, "System", "RuntimeFieldHandle", true);
|
|
initializeArrayMethod.Parameters.Add(new ParameterDefinition(systemArrayType));
|
|
initializeArrayMethod.Parameters.Add(new ParameterDefinition(runtimeFieldHandleType));
|
|
}
|
|
return initializeArrayMethod;
|
|
}
|
|
|
|
public void addInitializeArrayCode(Block block, int start, int numToRemove, TypeReference elementType, byte[] data) {
|
|
int index = start;
|
|
block.replace(index++, numToRemove, DotNetUtils.createLdci4(data.Length / elementType.PrimitiveSize));
|
|
block.insert(index++, Instruction.Create(OpCodes.Newarr, elementType));
|
|
block.insert(index++, Instruction.Create(OpCodes.Dup));
|
|
block.insert(index++, Instruction.Create(OpCodes.Ldtoken, create(data)));
|
|
block.insert(index++, Instruction.Create(OpCodes.Call, InitializeArrayMethod));
|
|
}
|
|
|
|
void createOurType() {
|
|
if (ourType != null)
|
|
return;
|
|
|
|
var attrs = TypeAttributes.NotPublic | TypeAttributes.AutoLayout |
|
|
TypeAttributes.Class | TypeAttributes.AnsiClass;
|
|
ourType = new TypeDefinition("", string.Format("<PrivateImplementationDetails>{0}", Guid.NewGuid().ToString("B")), attrs, module.TypeSystem.Object);
|
|
ourType.MetadataToken = DotNetUtils.nextTypeDefToken();
|
|
module.Types.Add(ourType);
|
|
}
|
|
|
|
TypeDefinition getArrayType(long size) {
|
|
createOurType();
|
|
|
|
TypeDefinition arrayType;
|
|
if (sizeToArrayType.TryGetValue(size, out arrayType))
|
|
return arrayType;
|
|
|
|
if (valueType == null)
|
|
valueType = DotNetUtils.findOrCreateTypeReference(module, module.TypeSystem.Corlib as AssemblyNameReference, "System", "ValueType", false);
|
|
var attrs = TypeAttributes.NestedPrivate | TypeAttributes.ExplicitLayout |
|
|
TypeAttributes.Class | TypeAttributes.Sealed | TypeAttributes.AnsiClass;
|
|
arrayType = new TypeDefinition("", string.Format("__StaticArrayInitTypeSize={0}", size), attrs, valueType);
|
|
arrayType.MetadataToken = DotNetUtils.nextTypeDefToken();
|
|
ourType.NestedTypes.Add(arrayType);
|
|
sizeToArrayType[size] = arrayType;
|
|
arrayType.ClassSize = (int)size;
|
|
arrayType.PackingSize = 1;
|
|
arrayType.IsValueType = true;
|
|
return arrayType;
|
|
}
|
|
|
|
public FieldDefinition create(byte[] data) {
|
|
var arrayType = getArrayType(data.LongLength);
|
|
var attrs = FieldAttributes.Assembly | FieldAttributes.Static;
|
|
var field = new FieldDefinition(string.Format("field_{0}", unique++), attrs, arrayType);
|
|
field.MetadataToken = DotNetUtils.nextFieldToken();
|
|
ourType.Fields.Add(field);
|
|
var iv = new byte[data.Length];
|
|
Array.Copy(data, iv, data.Length);
|
|
field.InitialValue = iv;
|
|
return field;
|
|
}
|
|
}
|
|
}
|