private DumpedMethod readDumpedMethod()
{
var dm = new DumpedMethod ();
dm.mhFlags = reader.ReadUInt16 ();
dm.mhMaxStack = reader.ReadUInt16 ();
dm.mhCodeSize = reader.ReadUInt32 ();
dm.mhLocalVarSigTok = reader.ReadUInt32 ();
dm.mdImplFlags = reader.ReadUInt16 ();
dm.mdFlags = reader.ReadUInt16 ();
dm.mdName = reader.ReadUInt32 ();
dm.mdSignature = reader.ReadUInt32 ();
dm.mdParamList = reader.ReadUInt32 ();
dm.token = reader.ReadUInt32 ();
dm.code = reader.ReadBytes ((int) dm.mhCodeSize);
return dm;
}
public void add(DumpedMethod dm)
{
if ((dm.token >> 24) != 0x06 || dm.token == 0x06000000)
throw new ArgumentException("Invalid token");
methods[dm.token] = dm;
}
public void add(uint token, DumpedMethod info)
{
methods[token] = info;
}
public bool decrypt(PeImage peImage, ref DumpedMethods dumpedMethods)
{
this.peImage = peImage;
uint offset = peImage.rvaToOffset(peImage.Cor20Header.metadataDirectory.virtualAddress + peImage.Cor20Header.metadataDirectory.size);
if (!readCodeHeader(offset))
return false;
var metadataTables = peImage.Cor20Header.createMetadataTables();
var methodDefTable = metadataTables.getMetadataType(PE.MetadataIndex.iMethodDef);
if (methodDefTable.totalSize != codeHeader.methodDefElemSize)
return false;
var methodInfos = getMethodInfos(offset + 0x30 + codeHeader.totalCodeSize);
offset = methodDefTable.fileOffset - methodDefTable.totalSize;
foreach (var methodInfo in methodInfos) {
offset += methodDefTable.totalSize;
if (methodInfo.flags == 0 || methodInfo.codeOffs == 0)
continue;
uint rva = peImage.offsetReadUInt32(offset);
peImage.writeUint16(rva, (ushort)methodInfo.flags);
peImage.writeUint32(rva + 8, methodInfo.localVarSigTok);
}
dumpedMethods = new DumpedMethods();
offset = methodDefTable.fileOffset;
for (int i = 0; i < methodInfos.Count; i++, offset += methodDefTable.totalSize) {
var methodInfo = methodInfos[i];
if (methodInfo.codeOffs == 0)
continue;
var dm = new DumpedMethod();
dm.token = 0x06000001 + (uint)i;
uint rva = peImage.offsetReadUInt32(offset);
dm.mdImplFlags = peImage.offsetReadUInt16(offset + (uint)methodDefTable.fields[1].offset);
dm.mdFlags = peImage.offsetReadUInt16(offset + (uint)methodDefTable.fields[2].offset);
dm.mdName = peImage.offsetRead(offset + (uint)methodDefTable.fields[3].offset, methodDefTable.fields[3].size);
dm.mdSignature = peImage.offsetRead(offset + (uint)methodDefTable.fields[4].offset, methodDefTable.fields[4].size);
dm.mdParamList = peImage.offsetRead(offset + (uint)methodDefTable.fields[5].offset, methodDefTable.fields[5].size);
dm.code = decrypter.decrypt(methodInfo);
if ((peImage.readByte(rva) & 3) == 2) {
dm.mhFlags = 2;
dm.mhMaxStack = 8;
dm.mhCodeSize = (uint)dm.code.Length;
dm.mhLocalVarSigTok = 0;
}
else {
dm.mhFlags = peImage.readUInt16(rva);
dm.mhMaxStack = peImage.readUInt16(rva + 2);
dm.mhCodeSize = (uint)dm.code.Length;
dm.mhLocalVarSigTok = peImage.readUInt32(rva + 8);
}
dumpedMethods.add(dm);
}
return true;
}
DumpedMethods decryptMethods()
{
var dumpedMethods = new DumpedMethods();
var methodInfos = new MethodInfos(mainType, peImage, peHeader, mcKey);
methodInfos.initializeInfos();
var metadataTables = peImage.Cor20Header.createMetadataTables();
var methodDef = metadataTables.getMetadataType(MetadataIndex.iMethodDef);
uint methodDefOffset = methodDef.fileOffset;
for (int i = 0; i < methodDef.rows; i++, methodDefOffset += methodDef.totalSize) {
uint bodyRva = peImage.offsetReadUInt32(methodDefOffset);
if (bodyRva == 0)
continue;
var info = methodInfos.lookup(bodyRva);
if (info == null)
continue;
uint bodyOffset = peImage.rvaToOffset(bodyRva);
ushort magic = peImage.offsetReadUInt16(bodyOffset);
if (magic != 0xFFF3)
continue;
var dm = new DumpedMethod();
dm.token = (uint)(0x06000001 + i);
dm.mdImplFlags = peImage.offsetReadUInt16(methodDefOffset + (uint)methodDef.fields[1].offset);
dm.mdFlags = peImage.offsetReadUInt16(methodDefOffset + (uint)methodDef.fields[2].offset);
dm.mdName = peImage.offsetRead(methodDefOffset + (uint)methodDef.fields[3].offset, methodDef.fields[3].size);
dm.mdSignature = peImage.offsetRead(methodDefOffset + (uint)methodDef.fields[4].offset, methodDef.fields[4].size);
dm.mdParamList = peImage.offsetRead(methodDefOffset + (uint)methodDef.fields[5].offset, methodDef.fields[5].size);
var reader = new BinaryReader(new MemoryStream(info.body));
byte b = reader.ReadByte();
if ((b & 3) == 2) {
dm.mhFlags = 2;
dm.mhMaxStack = 8;
dm.mhCodeSize = (uint)(b >> 2);
dm.mhLocalVarSigTok = 0;
}
else {
reader.BaseStream.Position--;
dm.mhFlags = reader.ReadUInt16();
dm.mhMaxStack = reader.ReadUInt16();
dm.mhCodeSize = reader.ReadUInt32();
dm.mhLocalVarSigTok = reader.ReadUInt32();
uint codeOffset = (uint)(dm.mhFlags >> 12) * 4;
reader.BaseStream.Position += codeOffset - 12;
}
dm.code = reader.ReadBytes((int)dm.mhCodeSize);
if ((dm.mhFlags & 8) != 0) {
reader.BaseStream.Position = (reader.BaseStream.Position + 3) & ~3;
dm.extraSections = reader.ReadBytes((int)(reader.BaseStream.Length - reader.BaseStream.Position));
}
dumpedMethods.add(dm);
}
return dumpedMethods;
}