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Move code to a new class

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This commit is contained in:
de4dot 2012-04-22 13:43:43 +02:00
parent 4ee463f49a
commit 1a79ffde92
3 changed files with 102 additions and 37 deletions
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1
de4dot.code/de4dot.code.csproj
View File

@ -178,6 +178,7 @@
<Compile Include="deobfuscators\MaxtoCode\Deobfuscator.cs" />
<Compile Include="deobfuscators\MaxtoCode\FileDecrypter.cs" />
<Compile Include="deobfuscators\MaxtoCode\MainType.cs" />
<Compile Include="deobfuscators\MethodBodyParser.cs" />
<Compile Include="deobfuscators\MethodCollection.cs" />
<Compile Include="deobfuscators\MethodsDecrypter.cs" />
<Compile Include="deobfuscators\MethodStack.cs" />

38
de4dot.code/deobfuscators/CodeVeil/MethodsDecrypter.cs
View File

@ -53,7 +53,7 @@ namespace de4dot.code.deobfuscators.CodeVeil {
dm.mhCodeSize = (uint)DeobUtils.readVariableLengthInt32(methodsDataReader);
dm.code = methodsDataReader.ReadBytes((int)dm.mhCodeSize);
if ((dm.mhFlags & 8) != 0)
dm.extraSections = readExtraSections(methodsDataReader);
dm.extraSections = MethodBodyParser.readExtraSections(methodsDataReader);
if (!decryptCode(dm))
return false;
@ -64,42 +64,6 @@ namespace de4dot.code.deobfuscators.CodeVeil {
protected virtual bool decryptCode(DumpedMethod dm) {
return true;
}
static void align(BinaryReader reader, int alignment) {
reader.BaseStream.Position = (reader.BaseStream.Position + alignment - 1) & ~(alignment - 1);
}
static byte[] readExtraSections(BinaryReader reader) {
align(reader, 4);
int startPos = (int)reader.BaseStream.Position;
parseSection(reader);
int size = (int)reader.BaseStream.Position - startPos;
reader.BaseStream.Position = startPos;
return reader.ReadBytes(size);
}
static void parseSection(BinaryReader reader) {
byte flags;
do {
align(reader, 4);
flags = reader.ReadByte();
if ((flags & 1) == 0)
throw new ApplicationException("Not an exception section");
if ((flags & 0x3E) != 0)
throw new ApplicationException("Invalid bits set");
if ((flags & 0x40) != 0) {
reader.BaseStream.Position--;
int num = (int)(reader.ReadUInt32() >> 8) / 24;
reader.BaseStream.Position += num * 24;
}
else {
int num = reader.ReadByte() / 12;
reader.BaseStream.Position += 2 + num * 12;
}
} while ((flags & 0x80) != 0);
}
}
class DecrypterV5 : Decrypter {

100
de4dot.code/deobfuscators/MethodBodyParser.cs Normal file
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@ -0,0 +1,100 @@
/*
Copyright (C) 2011-2012 de4dot@gmail.com
This file is part of de4dot.
de4dot is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
de4dot is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with de4dot. If not, see <http://www.gnu.org/licenses/>.
*/
using System;
using System.IO;
namespace de4dot.code.deobfuscators {
static class MethodBodyParser {
public static void parseMethodBody(BinaryReader reader, out byte[] code, out byte[] extraSections) {
long methodBodyOffset = reader.BaseStream.Position;
uint codeOffset;
int codeSize;
ushort flags;
switch (peek(reader) & 3) {
case 2:
flags = 2;
codeOffset = 1;
codeSize = reader.ReadByte() >> 2;
break;
case 3:
flags = reader.ReadUInt16();
codeOffset = (uint)(4 * (flags >> 12));
reader.ReadUInt16(); // maxStack
codeSize = reader.ReadInt32();
reader.ReadUInt32(); // LocalVarSigTok
break;
default:
throw new ApplicationException("Invalid method body header");
}
code = reader.ReadBytes(codeSize);
if ((flags & 8) != 0)
extraSections = readExtraSections(reader);
else
extraSections = null;
}
static void align(BinaryReader reader, int alignment) {
reader.BaseStream.Position = (reader.BaseStream.Position + alignment - 1) & ~(alignment - 1);
}
public static byte[] readExtraSections(BinaryReader reader) {
align(reader, 4);
int startPos = (int)reader.BaseStream.Position;
parseSection(reader);
int size = (int)reader.BaseStream.Position - startPos;
reader.BaseStream.Position = startPos;
return reader.ReadBytes(size);
}
static void parseSection(BinaryReader reader) {
byte flags;
do {
align(reader, 4);
flags = reader.ReadByte();
if ((flags & 1) == 0)
throw new ApplicationException("Not an exception section");
if ((flags & 0x3E) != 0)
throw new ApplicationException("Invalid bits set");
if ((flags & 0x40) != 0) {
reader.BaseStream.Position--;
int num = (int)(reader.ReadUInt32() >> 8) / 24;
reader.BaseStream.Position += num * 24;
}
else {
int num = reader.ReadByte() / 12;
reader.BaseStream.Position += 2 + num * 12;
}
} while ((flags & 0x80) != 0);
}
static byte peek(BinaryReader reader) {
byte b = reader.ReadByte();
reader.BaseStream.Position--;
return b;
}
}
}