59 lines
2.8 KiB
C#
59 lines
2.8 KiB
C#
using dnlib.DotNet;
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using dnlib.DotNet.Emit;
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using Obfuz.Data;
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using Obfuz.Emit;
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using Obfuz.Settings;
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using Obfuz.Utils;
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using System.Collections.Generic;
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namespace Obfuz.ObfusPasses.CallObfus
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{
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public class DispatchProxyObfuscator : ObfuscatorBase
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{
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private readonly EncryptionScopeProvider _encryptionScopeProvider;
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private readonly ConstFieldAllocator _constFieldAllocator;
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private readonly DispatchProxyAllocator _proxyCallAllocator;
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private readonly GroupByModuleEntityManager _moduleEntityManager;
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public DispatchProxyObfuscator(EncryptionScopeProvider encryptionScopeProvider, ConstFieldAllocator constFieldAllocator, GroupByModuleEntityManager moduleEntityManager, CallObfuscationSettingsFacade settings)
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{
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_encryptionScopeProvider = encryptionScopeProvider;
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_constFieldAllocator = constFieldAllocator;
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_moduleEntityManager = moduleEntityManager;
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_proxyCallAllocator = new DispatchProxyAllocator(encryptionScopeProvider, moduleEntityManager, settings);
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}
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public override void Done()
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{
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_proxyCallAllocator.Done();
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}
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public override bool Obfuscate(MethodDef callerMethod, IMethod calledMethod, bool callVir, List<Instruction> obfuscatedInstructions)
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{
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MethodSig sharedMethodSig = MetaUtil.ToSharedMethodSig(calledMethod.Module.CorLibTypes, MetaUtil.GetInflatedMethodSig(calledMethod, null));
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ProxyCallMethodData proxyCallMethodData = _proxyCallAllocator.Allocate(callerMethod.Module, calledMethod, callVir);
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DefaultMetadataImporter importer = _moduleEntityManager.GetDefaultModuleMetadataImporter(callerMethod.Module, _encryptionScopeProvider);
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//if (needCacheCall)
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//{
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// FieldDef cacheField = _constFieldAllocator.Allocate(callerMethod.Module, proxyCallMethodData.index);
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// obfuscatedInstructions.Add(Instruction.Create(OpCodes.Ldsfld, cacheField));
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//}
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//else
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//{
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// obfuscatedInstructions.Add(Instruction.CreateLdcI4(proxyCallMethodData.encryptedIndex));
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// obfuscatedInstructions.Add(Instruction.CreateLdcI4(proxyCallMethodData.encryptOps));
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// obfuscatedInstructions.Add(Instruction.CreateLdcI4(proxyCallMethodData.salt));
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// obfuscatedInstructions.Add(Instruction.Create(OpCodes.Call, importer.DecryptInt));
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//}
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FieldDef cacheField = _constFieldAllocator.Allocate(callerMethod.Module, proxyCallMethodData.index);
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obfuscatedInstructions.Add(Instruction.Create(OpCodes.Ldsfld, cacheField));
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obfuscatedInstructions.Add(Instruction.Create(OpCodes.Call, proxyCallMethodData.proxyMethod));
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return true;
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}
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}
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}
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