75 lines
2.4 KiB
C#
75 lines
2.4 KiB
C#
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/*
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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.Collections.Generic;
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using Mono.Cecil;
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using Mono.Cecil.Cil;
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namespace de4dot.blocks.cflow {
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// Only deobfuscates a method once. A copy of the method (now deobfuscated) is returned.
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public class CachedCflowDeobfuscator {
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BlocksCflowDeobfuscator cflowDeobfuscator = new BlocksCflowDeobfuscator();
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Dictionary<MethodDefinition, MethodDefinition> deobfuscated = new Dictionary<MethodDefinition, MethodDefinition>();
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public CachedCflowDeobfuscator() {
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}
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public CachedCflowDeobfuscator(IEnumerable<IBlocksDeobfuscator> blocksDeobfuscators) {
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add(blocksDeobfuscators);
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}
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public void add(IEnumerable<IBlocksDeobfuscator> blocksDeobfuscators) {
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foreach (var bd in blocksDeobfuscators)
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cflowDeobfuscator.add(bd);
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}
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public void add(IBlocksDeobfuscator blocksDeobfuscator) {
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cflowDeobfuscator.add(blocksDeobfuscator);
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}
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public MethodDefinition deobfuscate(MethodDefinition method) {
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MethodDefinition deobfuscatedMethod;
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if (deobfuscated.TryGetValue(method, out deobfuscatedMethod))
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return deobfuscatedMethod;
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if (method.Body == null || method.Body.Instructions.Count == 0) {
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deobfuscated[method] = method;
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return method;
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}
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deobfuscatedMethod = DotNetUtils.clone(method);
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deobfuscated[method] = deobfuscatedMethod;
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var blocks = new Blocks(deobfuscatedMethod);
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deobfuscate(blocks);
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IList<Instruction> allInstructions;
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IList<ExceptionHandler> allExceptionHandlers;
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blocks.getCode(out allInstructions, out allExceptionHandlers);
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DotNetUtils.restoreBody(deobfuscatedMethod, allInstructions, allExceptionHandlers);
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return deobfuscatedMethod;
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}
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void deobfuscate(Blocks blocks) {
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cflowDeobfuscator.init(blocks);
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cflowDeobfuscator.deobfuscate();
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}
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}
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}
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