97 lines
2.7 KiB
C#
97 lines
2.7 KiB
C#
/*
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Copyright (C) 2011-2012 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 Mono.Cecil;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.dotNET_Reactor.v4 {
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class BooleanDecrypter {
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ModuleDefinition module;
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EncryptedResource encryptedResource;
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byte[] fileData;
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byte[] decryptedData;
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public bool Detected {
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get { return encryptedResource.Method != null; }
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}
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public TypeDefinition DecrypterType {
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get { return encryptedResource.Type; }
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}
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public MethodDefinition Method {
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get { return encryptedResource.Method; }
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}
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public EmbeddedResource Resource {
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get { return encryptedResource.Resource; }
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}
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public BooleanDecrypter(ModuleDefinition module) {
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this.module = module;
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this.encryptedResource = new EncryptedResource(module);
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}
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public BooleanDecrypter(ModuleDefinition module, BooleanDecrypter oldOne) {
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this.module = module;
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this.encryptedResource = new EncryptedResource(module, oldOne.encryptedResource);
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}
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public void find() {
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var additionalTypes = new string[] {
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"System.Boolean",
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};
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foreach (var type in module.Types) {
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if (type.BaseType == null || type.BaseType.FullName != "System.Object")
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continue;
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foreach (var method in type.Methods) {
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if (!method.IsStatic || !method.HasBody)
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continue;
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if (!DotNetUtils.isMethod(method, "System.Boolean", "(System.Int32)"))
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continue;
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if (!encryptedResource.couldBeResourceDecrypter(method, additionalTypes))
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continue;
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encryptedResource.Method = method;
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return;
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}
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}
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}
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public void init(byte[] fileData, ISimpleDeobfuscator simpleDeobfuscator) {
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if (encryptedResource.Method == null)
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return;
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this.fileData = fileData;
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encryptedResource.init(simpleDeobfuscator);
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if (!encryptedResource.FoundResource)
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return;
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Log.v("Adding boolean decrypter. Resource: {0}", Utils.toCsharpString(encryptedResource.Resource.Name));
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decryptedData = encryptedResource.decrypt();
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}
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public bool decrypt(int offset) {
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uint byteOffset = BitConverter.ToUInt32(decryptedData, offset);
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return fileData[byteOffset] == 0x80;
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}
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}
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}
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