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Add BoolValueInliner class

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de4dot 2011-10-26 21:05:35 +02:00
parent 0c0093ff76
commit db7edc2a72
4 changed files with 84 additions and 0 deletions
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1
de4dot.code/de4dot.code.csproj
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@ -70,6 +70,7 @@
<Compile Include="deobfuscators\DeobUtils.cs" />
<Compile Include="deobfuscators\Dotfuscator\Deobfuscator.cs" />
<Compile Include="deobfuscators\dotNET_Reactor\BooleanDecrypter.cs" />
<Compile Include="deobfuscators\dotNET_Reactor\BoolValueInliner.cs" />
<Compile Include="deobfuscators\dotNET_Reactor\Deobfuscator.cs" />
<Compile Include="deobfuscators\dotNET_Reactor\EncryptedResource.cs" />
<Compile Include="deobfuscators\dotNET_Reactor\LocalTypes.cs" />

70
de4dot.code/deobfuscators/dotNET_Reactor/BoolValueInliner.cs Normal file
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@ -0,0 +1,70 @@
/*
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.Collections.Generic;
using Mono.Cecil;
using Mono.Cecil.Cil;
using de4dot.blocks;
namespace de4dot.deobfuscators.dotNET_Reactor {
class BoolValueInliner : MethodReturnValueInliner {
Dictionary<MethodReferenceAndDeclaringTypeKey, Func<MethodDefinition, object[], bool>> boolDecrypters = new Dictionary<MethodReferenceAndDeclaringTypeKey, Func<MethodDefinition, object[], bool>>();
class MyCallResult : CallResult {
public MethodReferenceAndDeclaringTypeKey methodKey;
public MyCallResult(Block block, int callEndIndex, MethodReference method)
: base(block, callEndIndex) {
this.methodKey = new MethodReferenceAndDeclaringTypeKey(method);
}
}
public bool HasHandlers {
get { return boolDecrypters.Count != 0; }
}
public void add(MethodDefinition method, Func<MethodDefinition, object[], bool> handler) {
if (method != null)
boolDecrypters[new MethodReferenceAndDeclaringTypeKey(method)] = handler;
}
protected override void inlineReturnValues(IList<CallResult> callResults) {
foreach (var callResult in callResults) {
var block = callResult.block;
int num = callResult.callEndIndex - callResult.callStartIndex + 1;
block.replace(callResult.callStartIndex, num, DotNetUtils.createLdci4((bool)callResult.returnValue ? 1 : 0));
Log.v("Decrypted boolean: {0}", callResult.returnValue);
}
}
protected override void inlineAllCalls() {
foreach (var tmp in callResults) {
var callResult = (MyCallResult)tmp;
var handler = boolDecrypters[callResult.methodKey];
callResult.returnValue = handler((MethodDefinition)callResult.methodKey.MethodReference, callResult.args);
}
}
protected override CallResult createCallResult(MethodReference method, Block block, int callInstrIndex) {
if (!boolDecrypters.ContainsKey(new MethodReferenceAndDeclaringTypeKey(method)))
return null;
return new MyCallResult(block, callInstrIndex, method);
}
}
}

4
de4dot.code/deobfuscators/dotNET_Reactor/BooleanDecrypter.cs
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@ -32,6 +32,10 @@ namespace de4dot.deobfuscators.dotNET_Reactor {
get { return encryptedResource.ResourceDecrypterMethod != null; }
}
public MethodDefinition BoolDecrypterMethod {
get { return encryptedResource.ResourceDecrypterMethod; }
}
public BooleanDecrypter(ModuleDefinition module) {
this.module = module;
this.encryptedResource = new EncryptedResource(module);

9
de4dot.code/deobfuscators/dotNET_Reactor/Deobfuscator.cs
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@ -56,6 +56,7 @@ namespace de4dot.deobfuscators.dotNET_Reactor {
MethodsDecrypter methodsDecrypter;
StringDecrypter stringDecrypter;
BooleanDecrypter booleanDecrypter;
BoolValueInliner boolValueInliner;
internal class Options : OptionsBase {
}
@ -134,6 +135,11 @@ namespace de4dot.deobfuscators.dotNET_Reactor {
stringDecrypter.init(peImage, DeobfuscatedFile);
booleanDecrypter.init(fileData, DeobfuscatedFile);
boolValueInliner = new BoolValueInliner();
boolValueInliner.add(booleanDecrypter.BoolDecrypterMethod, (method, args) => {
return booleanDecrypter.decrypt((int)args[0]);
});
foreach (var info in stringDecrypter.DecrypterInfos) {
staticStringDecrypter.add(info.method, (method2, args) => {
@ -144,6 +150,9 @@ namespace de4dot.deobfuscators.dotNET_Reactor {
}
public override void deobfuscateMethodEnd(Blocks blocks) {
if (boolValueInliner.HasHandlers)
boolValueInliner.decrypt(blocks);
base.deobfuscateMethodEnd(blocks);
}