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Create a new unique GUID that depends on the module

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de4dot 2012-01-24 15:14:57 +01:00
parent 9831dbdcdb
commit fb1a45c5a4
1 changed files with 18 additions and 1 deletions
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19
de4dot.code/deobfuscators/InitializedDataCreator.cs
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@ -19,6 +19,8 @@
using System;
using System.Collections.Generic;
using System.IO;
using System.Security.Cryptography;
using Mono.Cecil;
using Mono.Cecil.Cil;
using de4dot.blocks;
@ -67,11 +69,26 @@ namespace de4dot.code.deobfuscators {
var attrs = TypeAttributes.NotPublic | TypeAttributes.AutoLayout |
TypeAttributes.Class | TypeAttributes.AnsiClass;
ourType = new TypeDefinition("", string.Format("<PrivateImplementationDetails>{0}", Guid.NewGuid().ToString("B")), attrs, module.TypeSystem.Object);
ourType = new TypeDefinition("", string.Format("<PrivateImplementationDetails>{0}", getModuleId()), attrs, module.TypeSystem.Object);
ourType.MetadataToken = DotNetUtils.nextTypeDefToken();
module.Types.Add(ourType);
}
object getModuleId() {
var memoryStream = new MemoryStream();
var writer = new BinaryWriter(memoryStream);
if (module.Assembly != null)
writer.Write(module.Assembly.Name.FullName);
writer.Write(module.Mvid.ToByteArray());
var hash = new SHA1Managed().ComputeHash(memoryStream.GetBuffer());
var guid = new Guid(BitConverter.ToInt32(hash, 0),
BitConverter.ToInt16(hash, 4),
BitConverter.ToInt16(hash, 6),
hash[8], hash[9], hash[10], hash[11],
hash[12], hash[13], hash[14], hash[15]);
return guid.ToString("B");
}
TypeDefinition getArrayType(long size) {
createOurType();