mirror of
https://github.com/0xd4d/de4dot
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de4dot
97 lines
4.1 KiB
C#
97 lines
4.1 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.Goliath_NET {
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class ArrayValueInliner : MethodReturnValueInliner {
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MethodDefinitionAndDeclaringTypeDict<Func<MethodDefinition, object[], byte[]>> intDecrypters = new MethodDefinitionAndDeclaringTypeDict<Func<MethodDefinition, object[], byte[]>>();
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InitializedDataCreator initializedDataCreator;
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ModuleDefinition module;
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MethodReference initializeArrayMethod;
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class MyCallResult : CallResult {
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public MethodReference methodReference;
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public MyCallResult(Block block, int callEndIndex, MethodReference method)
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: base(block, callEndIndex) {
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this.methodReference = method;
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}
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}
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public bool HasHandlers {
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get { return intDecrypters.Count != 0; }
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}
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public ArrayValueInliner(ModuleDefinition module, InitializedDataCreator initializedDataCreator) {
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this.module = module;
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this.initializedDataCreator = initializedDataCreator;
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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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public void add(MethodDefinition method, Func<MethodDefinition, object[], byte[]> handler) {
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if (method == null)
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return;
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if (intDecrypters.find(method) != null)
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throw new ApplicationException(string.Format("Handler for method {0:X8} has already been added", method.MetadataToken.ToInt32()));
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intDecrypters.add(method, handler);
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}
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protected override void inlineReturnValues(IList<CallResult> callResults) {
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foreach (var callResult in callResults) {
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var block = callResult.block;
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int num = callResult.callEndIndex - callResult.callStartIndex + 1;
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var ary = (byte[])callResult.returnValue;
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int index = callResult.callStartIndex;
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block.replace(index++, num, DotNetUtils.createLdci4(ary.Length));
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block.insert(index++, Instruction.Create(OpCodes.Newarr, module.TypeSystem.Byte));
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block.insert(index++, Instruction.Create(OpCodes.Dup));
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block.insert(index++, Instruction.Create(OpCodes.Ldtoken, initializedDataCreator.create(ary)));
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block.insert(index++, Instruction.Create(OpCodes.Call, initializeArrayMethod));
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Log.v("Decrypted array: {0} bytes", ary.Length);
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}
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}
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protected override void inlineAllCalls() {
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foreach (var tmp in callResults) {
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var callResult = (MyCallResult)tmp;
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var handler = intDecrypters.find(callResult.methodReference);
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callResult.returnValue = handler((MethodDefinition)callResult.methodReference, callResult.args);
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}
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}
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protected override CallResult createCallResult(MethodReference method, Block block, int callInstrIndex) {
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if (intDecrypters.find(method) == null)
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return null;
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return new MyCallResult(block, callInstrIndex, method);
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}
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}
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}
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