132 lines
3.4 KiB
C#
132 lines
3.4 KiB
C#
/*
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Copyright (C) 2011-2013 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 System.Text;
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using dnlib.IO;
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using dnlib.DotNet;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.CryptoObfuscator {
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class ConstantsDecrypter {
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ModuleDefMD module;
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TypeDef decrypterType;
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MethodDef methodI4;
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MethodDef methodI8;
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MethodDef methodR4;
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MethodDef methodR8;
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EmbeddedResource encryptedResource;
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byte[] constantsData;
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public TypeDef Type {
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get { return decrypterType; }
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}
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public EmbeddedResource Resource {
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get { return encryptedResource; }
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}
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public MethodDef Int32Decrypter {
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get { return methodI4; }
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}
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public MethodDef Int64Decrypter {
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get { return methodI8; }
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}
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public MethodDef SingleDecrypter {
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get { return methodR4; }
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}
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public MethodDef DoubleDecrypter {
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get { return methodR8; }
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}
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public bool Detected {
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get { return decrypterType != null; }
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}
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public ConstantsDecrypter(ModuleDefMD module) {
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this.module = module;
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}
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public void Find() {
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foreach (var type in module.Types) {
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if (!CheckType(type))
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continue;
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decrypterType = type;
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return;
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}
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}
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static readonly string[] requiredTypes = new string[] {
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"System.Byte[]",
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};
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bool CheckType(TypeDef type) {
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if (type.Methods.Count != 7)
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return false;
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if (type.Fields.Count < 1 || type.Fields.Count > 2)
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return false;
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if (!new FieldTypes(type).All(requiredTypes))
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return false;
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if (!CheckMethods(type))
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return false;
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return true;
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}
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bool CheckMethods(TypeDef type) {
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methodI4 = DotNetUtils.GetMethod(type, "System.Int32", "(System.Int32)");
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methodI8 = DotNetUtils.GetMethod(type, "System.Int64", "(System.Int32)");
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methodR4 = DotNetUtils.GetMethod(type, "System.Single", "(System.Int32)");
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methodR8 = DotNetUtils.GetMethod(type, "System.Double", "(System.Int32)");
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return methodI4 != null && methodI8 != null &&
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methodR4 != null && methodR8 != null;
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}
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public void Initialize(ResourceDecrypter resourceDecrypter) {
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if (decrypterType == null)
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return;
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encryptedResource = CoUtils.GetResource(module, DotNetUtils.GetCodeStrings(decrypterType.FindStaticConstructor()));
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encryptedResource.Data.Position = 0;
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constantsData = resourceDecrypter.Decrypt(encryptedResource.Data.CreateStream());
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}
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public int DecryptInt32(int index) {
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return BitConverter.ToInt32(constantsData, index);
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}
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public long DecryptInt64(int index) {
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return BitConverter.ToInt64(constantsData, index);
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}
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public float DecryptSingle(int index) {
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return BitConverter.ToSingle(constantsData, index);
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}
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public double DecryptDouble(int index) {
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return BitConverter.ToDouble(constantsData, index);
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}
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}
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}
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