40 lines
1.8 KiB
C#
40 lines
1.8 KiB
C#
using dnlib.DotNet.Emit;
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using dnlib.DotNet;
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using System.Collections.Generic;
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using Obfuz.Utils;
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using Obfuz.Emit;
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namespace Obfuz.ObfusPasses.CallObfus
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{
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public class DefaultProxyCallObfuscator : CallObfuscatorBase
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{
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private readonly IRandom _random;
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private readonly IEncryptor _encryptor;
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private readonly CallProxyAllocator _proxyCallAllocator;
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public DefaultProxyCallObfuscator(IRandom random, IEncryptor encryptor)
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{
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_random = random;
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_encryptor = encryptor;
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_proxyCallAllocator = new CallProxyAllocator(random, _encryptor);
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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 void Obfuscate(MethodDef callingMethod, 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));
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ProxyCallMethodData proxyCallMethodData = _proxyCallAllocator.Allocate(callingMethod.Module, calledMethod, callVir);
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DefaultModuleMetadataImporter importer = MetadataImporter.Instance.GetDefaultModuleMetadataImporter(callingMethod.Module);
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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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obfuscatedInstructions.Add(Instruction.Create(OpCodes.Call, proxyCallMethodData.proxyMethod));
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}
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}
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}
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