78 lines
2.1 KiB
C#
78 lines
2.1 KiB
C#
/*
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Copyright (C) 2011-2014 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 dnlib.DotNet;
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namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
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class DecryptMethod {
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MethodDef decryptionMethod;
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byte[] key;
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byte[] iv;
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public byte[] Key {
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get { return key; }
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}
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public byte[] Iv {
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get { return iv; }
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}
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public bool Detected {
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get { return decryptionMethod != null; }
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}
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public static bool CouldBeDecryptMethod(MethodDef method, IEnumerable<string> additionalTypes) {
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if (method.Body == null)
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return false;
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var localTypes = new LocalTypes(method);
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var requiredTypes = new List<string> {
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"System.Byte[]",
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"System.IO.MemoryStream",
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"System.Security.Cryptography.CryptoStream",
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"System.Security.Cryptography.ICryptoTransform",
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};
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requiredTypes.AddRange(additionalTypes);
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if (!localTypes.All(requiredTypes))
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return false;
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if (!localTypes.Exists("System.Security.Cryptography.RijndaelManaged") &&
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!localTypes.Exists("System.Security.Cryptography.AesManaged"))
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return false;
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return true;
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}
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public bool GetKey(MethodDef method) {
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var tmpKey = ArrayFinder.GetInitializedByteArray(method, 32);
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if (tmpKey == null)
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return false;
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var tmpIv = ArrayFinder.GetInitializedByteArray(method, 16);
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if (tmpIv == null)
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return false;
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decryptionMethod = method;
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key = tmpKey;
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iv = tmpIv;
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return true;
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}
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}
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}
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