147 lines
3.8 KiB
C#
147 lines
3.8 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.Collections.Generic;
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using Mono.Cecil;
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using Mono.Cecil.Cil;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.Eazfuscator_NET {
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static class EfUtils {
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public static int indexOfPreviousLdci4Instruction(MethodDefinition method, int index) {
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var instrs = method.Body.Instructions;
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for (int i = index; i >= 0; i--) {
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var instr = instrs[i];
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if (DotNetUtils.isLdcI4(instr))
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return i;
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}
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return -1;
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}
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public static int indexOfNextLdci4Instruction(MethodDefinition method, int index) {
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if (index < 0)
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return -1;
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var instrs = method.Body.Instructions;
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for (int i = index; i < instrs.Count; i++) {
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var instr = instrs[i];
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if (DotNetUtils.isLdcI4(instr))
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return i;
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}
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return -1;
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}
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public static bool getNextInt32(MethodDefinition method, ref int index, out int val) {
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for (; index < method.Body.Instructions.Count; index++) {
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var instr = method.Body.Instructions[index];
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if (instr.OpCode.Code != Code.Ldc_I4_S && instr.OpCode.Code != Code.Ldc_I4)
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continue;
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return getInt32(method, ref index, out val);
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}
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val = 0;
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return false;
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}
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public static bool getInt16(MethodDefinition method, ref int index, ref short s) {
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int val;
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if (!getInt32(method, ref index, out val))
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return false;
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s = (short)val;
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return true;
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}
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public static bool getInt32(MethodDefinition method, ref int index, out int val) {
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val = 0;
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var instrs = method.Body.Instructions;
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if (index >= instrs.Count)
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return false;
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var ldci4 = instrs[index];
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if (ldci4.OpCode.Code != Code.Ldc_I4_S && ldci4.OpCode.Code != Code.Ldc_I4)
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return false;
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var stack = new Stack<int>();
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stack.Push(DotNetUtils.getLdcI4Value(ldci4));
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index++;
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for (; index < instrs.Count; index++) {
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int l = stack.Count - 1;
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var instr = instrs[index];
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switch (instr.OpCode.Code) {
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case Code.Not:
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stack.Push(~stack.Pop());
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break;
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case Code.Neg:
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stack.Push(-stack.Pop());
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break;
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case Code.Ldc_I4:
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case Code.Ldc_I4_S:
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case Code.Ldc_I4_0:
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case Code.Ldc_I4_1:
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case Code.Ldc_I4_2:
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case Code.Ldc_I4_3:
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case Code.Ldc_I4_4:
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case Code.Ldc_I4_5:
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case Code.Ldc_I4_6:
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case Code.Ldc_I4_7:
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case Code.Ldc_I4_8:
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case Code.Ldc_I4_M1:
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stack.Push(DotNetUtils.getLdcI4Value(instr));
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break;
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case Code.Xor:
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if (stack.Count < 2)
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goto done;
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stack.Push(stack.Pop() ^ stack.Pop());
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break;
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default:
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goto done;
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}
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}
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done:
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while (stack.Count > 1)
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stack.Pop();
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val = stack.Pop();
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return true;
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}
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public static MethodDefinition getResolveMethod(MethodDefinition method) {
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if (method == null || method.Body == null)
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return null;
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foreach (var instr in method.Body.Instructions) {
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if (instr.OpCode.Code != Code.Ldftn && instr.OpCode.Code != Code.Ldvirtftn)
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continue;
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var handler = instr.Operand as MethodDefinition;
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if (handler == null)
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continue;
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if (!DotNetUtils.isMethod(handler, "System.Reflection.Assembly", "(System.Object,System.ResolveEventArgs)"))
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continue;
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return handler;
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}
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return null;
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}
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}
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}
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