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