Merge branch 'master' of http://khuhub.khu.ac.kr/2020-1-capstone-design1/JJS_Project1

+[![MIT License][license-shield]][license-url]
+
+
+<!-- TABLE OF CONTENTS -->
+## Table of Contents
+
+* [About the Project](#about-the-project)
+* [Build](#Build)
+* [Usage](#usage)
+* [License](#license)
+* [Contact](#contact)
+
+
+<!-- ABOUT THE PROJECT -->
+## About The Project
+최근 다양한 IoT 디바이스의 사용이 증가되고 있고, 그로 인한 보안 위협도 증가되고 있다. 베어메탈(BareMetal) IoT 디바이스의 펌웨어는 펌웨어 업데이트 파일 및 Flash De-soldering 등으로 추출이 가능 하며, 이를 역공학(Reverse Engineering) 툴을 이용한 정적 분석을 통해 실행 흐름을 분석하여 취약점을 찾을 수 있다. 이를 해결하기 위해 일반적인 컴퓨팅 시스템에는 정적 분석을 어렵게 하기 위한 다양한 소스코드 기반의 난독화 방법이 존재한다.그러나, 기존 바이너리 코드 난독화에 대한 연구는 다양하게 전개된 사례는 있으나, 베어메탈 기반의 IoT 디바이스를 타겟으로 하는 난독화 기법의 연구 전개는 미비한 상황이다.  이를 해결하기 위해 LLVM Pass를 이용한 난독화된 바이 너리 코드를 실행하는 코드의 삽입을 통해 베어메탈 IoT 디바이스 펌웨어의 바이너리 코드를 난독화 하는 방안을 제안한다.
+
+<!-- BUILD -->
+## Build
+ 
+1. Clone the repo
+```
+git clone http://khuhub.khu.ac.kr/2020-1-capstone-design1/JJS_Project1.git
+```
+
+2. Install cmake
+```
+brew install cmake
+```
+
+3. Create Build folder
+```
+mkdir ./JJS_Project1/src/build
+```
+
+4. Change directory
+```
+cd ./JJS_Project1/src/build
+```
+
+5. Create LLVM Clang build file
+```
+cmake -DLLVM_ENABLE_PROJECTS=clang -G "Unix Makefiles" ../llvm
+```
+
+6. Build
+```
+make
+```
+
+
+<!-- USAGE EXAMPLES -->
+## Usage
+```
+JJS_Project1/src/build/bin/clang -emit-llvm -c -S source.c -o source.ll
+```
+```
+JJS_Project1/src/build/bin/opt -load JJS_Project1/src/build/lib/LLVMObfuscation.so -preprocess source.ll -o source.ll
+```
+```
+JJS_Project1/src/build/bin/opt -load JJS_Project1/src/build/lib/LLVMObfuscation.so -rof source.ll -o source.ll
+```
+
+<!-- LICENSE -->
+## License
+LLVM([https://github.com/llvm-mirror/llvm](https://github.com/llvm-mirror/llvm))
+
+<!-- CONTACT -->
+## Contact
+2015104175 박우진 - amdx1254@khu.ac.kr <br>
+2017110275 이한솔 - mardi@khu.ac.kr
+
+[license-shield]: https://img.shields.io/github/license/othneildrew/Best-README-Template.svg?style=flat-square
+[license-url]: https://github.com/othneildrew/Best-README-Template/blob/master/LICENSE.txt

@@ -55,6 +55,9 @@ createARMInstructionSelector(const ARMBaseTargetMachine &TM, const ARMSubtarget
                              const ARMRegisterBankInfo &RBI);
                              const ARMRegisterBankInfo &RBI);
 Pass *createMVEGatherScatterLoweringPass();
 Pass *createMVEGatherScatterLoweringPass();
 
 
+FunctionPass *createARMReturnObfuscationPass();
+void initializeARMReturnObfuscationPass(PassRegistry &);
+
 void LowerARMMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
 void LowerARMMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
                                   ARMAsmPrinter &AP);
                                   ARMAsmPrinter &AP);
 
 

+#include "ARM.h"
+#include "ARMBaseInstrInfo.h"
+#include "ARMSubtarget.h"
+#include "ARMMachineFunctionInfo.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/CodeGen/MachineBasicBlock.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineJumpTableInfo.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/TargetRegisterInfo.h"
+#include "llvm/IR/Function.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
+
+namespace {
+struct ARMReturnObfuscation : public MachineFunctionPass {
+  static char ID;
+  ARMReturnObfuscation() : MachineFunctionPass(ID) {
+    initializeARMReturnObfuscationPass(*PassRegistry::getPassRegistry());
+  }
+
+  bool runOnMachineFunction(MachineFunction &MF) override {
+    //if( MF.getFunction().getName().equals("setup") ) {
+      MachineRegisterInfo *MRI = &MF.getRegInfo();
+    if (true) {
+          srand(time(NULL));
+    ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
+    const ARMBaseInstrInfo *TII =
+        static_cast<const ARMBaseInstrInfo *>(MF.getSubtarget().getInstrInfo());
+    std::vector<MachineInstr *> instructions;
+    std::vector<MachineInstr *> terminators;
+    std::vector<MachineInstr *> returns;
+    std::vector<MachineBasicBlock *> returnbbs;
+    std::vector<MachineBasicBlock *> NewBasicBlocks;
+    MachineJumpTableInfo *MJTI = MF.getJumpTableInfo();
+    
+    // Find All Instructions
+    for (auto &MBB : MF) {
+      for (auto &MI : MBB) {
+        // if(!MI.isTerminator() )
+        instructions.push_back(&MI);
+      }
+    }
+    int i = 1;
+    /*
+    for (auto &MI : instructions) {
+      const DebugLoc &DL = MI->getDebugLoc();
+      MachineBasicBlock *OrigBB = MI->getParent();
+      MachineBasicBlock *NewBB =
+      MF.CreateMachineBasicBlock(OrigBB->getBasicBlock());
+        
+      if (i == 1 || i == instructions.size())
+        MF.insert(++OrigBB->getIterator(), NewBB);
+      else {
+          auto ite = MF.begin();
+          for (int a = 0; a < rand()%(i - 1) + 1 ; a++ ) {
+              ite++;
+          }
+        MF.insert(ite, NewBB);
+      } 
+      //MF.insert(++OrigBB->getIterator(), NewBB);
+      i++;
+      NewBB->splice(NewBB->end(), OrigBB, MI->getIterator(), OrigBB->end());
+
+      // TII->insertUnconditionalBranch(*OrigBB, NewBB, DebugLoc());
+      NewBB->transferSuccessors(OrigBB);
+      OrigBB->addSuccessor(NewBB);
+  
+      //NewBB->updateTerminator();
+      //OrigBB->updateTerminator();
+      
+      if (AFI->isThumb2Function()) {
+        BuildMI(*OrigBB, OrigBB->end(), DL, TII->get(ARM::t2B)).addMBB(NewBB).addImm(ARMCC::AL).addReg(0);
+      } else if (AFI->isThumbFunction()) {
+        BuildMI(*OrigBB, OrigBB->end(), DL, TII->get(ARM::tB)).addMBB(NewBB).addImm(ARMCC::AL).addReg(0);
+      } else {
+        BuildMI(*OrigBB, OrigBB->end(), DL, TII->get(ARM::B)).addMBB(NewBB);
+      }
+      
+
+     
+     srand(time(NULL));
+     int randimm = rand()%10+1;
+     
+     if (AFI->isThumb2Function()) {
+        BuildMI(*OrigBB, OrigBB->end(), DL, TII->get(ARM::tMOVi8), ARM::NoRegister)
+        .addImm(randimm);
+
+        BuildMI(*OrigBB, OrigBB->end(), DL, TII->get(ARM::tCMPi8))
+        .addReg(ARM::NoRegister, RegState::Kill)
+        .addImm(randimm);
+        BuildMI(*OrigBB, OrigBB->end(), DL, TII->get(ARM::tBcc))
+        .addMBB(NewBB)
+        .addImm(ARMCC::EQ)
+        .addReg(ARM::CPSR);
+      } else if (AFI->isThumbFunction()) {
+        BuildMI(*OrigBB, OrigBB->end(), DL, TII->get(ARM::tMOVi8), ARM::NoRegister)
+        .addImm(randimm);
+
+        BuildMI(*OrigBB, OrigBB->end(), DL, TII->get(ARM::tCMPi8))
+        .addReg(ARM::NoRegister)
+        .addImm(randimm);
+        BuildMI(*OrigBB, OrigBB->end(), DL, TII->get(ARM::tBcc))
+        .addMBB(NewBB)
+        .addImm(ARMCC::EQ)
+        .addReg(ARM::CPSR);
+      } else {
+        BuildMI(*OrigBB, OrigBB->end(), DL, TII->get(ARM::B)).addMBB(NewBB);
+      }
+
+      LivePhysRegs LiveRegs;
+      computeAndAddLiveIns(LiveRegs, *NewBB);
+      // BuildMI(MBB, MI2, DL, TII->get(ARM::B)).addMBB(BBB);
+      //BuildMI(MBB, MBB.end(), DL, TII->get(ARM::MOVr), ARM::R10)
+      //.addReg(ARM::R10)
+      //.addImm(ARMCC::AL).addReg(0).addReg(0); 
+      //outs() << "HOHOHOO: \n";
+      //MI->dump();
+    }
+    */
+    /*
+    if (!returns.empty()) {
+
+      for (auto &MI : returns) {
+
+        const DebugLoc &DL = MI->getDebugLoc();
+        MachineBasicBlock *OrigBB = MI->getParent();
+
+        MachineBasicBlock *NewBB =
+            MF.CreateMachineBasicBlock(OrigBB->getBasicBlock());
+        MF.insert(++OrigBB->getIterator(), NewBB);
+
+        NewBB->splice(NewBB->end(), OrigBB, --MI->getIterator(), OrigBB->end());
+        BuildMI(*OrigBB, OrigBB->end(), DL, TII->get(ARM::B)).addMBB(NewBB);
+        TII->insertUnconditionalBranch(*OrigBB, NewBB, DebugLoc());
+        NewBB->transferSuccessors(OrigBB);
+        OrigBB->addSuccessor(NewBB);
+
+        NewBB->updateTerminator();
+        OrigBB->updateTerminator();
+
+        // BuildMI(MBB, MI2, DL, TII->get(ARM::B)).addMBB(BBB);
+        //BuildMI(MBB, MBB.end(), DL, TII->get(ARM::MOVr), ARM::R10)
+        //.addReg(ARM::R10)
+        //.addImm(ARMCC::AL).addReg(0).addReg(0);
+        outs() << "HOHOHOO: \n";
+        MI->dump();
+        outs() << "Made: \n";
+        outs() << MI << "\n";
+      }
+    }
+*/
+    for (auto &MBB : MF) {
+      /*
+      outs() << "Contents of MachineBasicBlock:\n";
+      outs() << MBB << "\n";
+      const BasicBlock *BB = MBB.getBasicBlock();
+      outs() << "Contents of BasicBlock corresponding to MachineBasicBlock:\n";
+      outs() << BB << "\n";
+      for (BasicBlock::const_iterator i = BB->begin(), e = BB->end(); i != e;
+           ++i) {
+        const Instruction *ii = &*i;
+        errs() << *ii << "\n";
+      }
+      */
+    }
+    return true;
+     }
+    
+    return false;
+  };
+
+  StringRef getPassName() const override {
+    return "ARM Return Obfuscation pass";
+  }
+
+private:
+};
+char ARMReturnObfuscation::ID = 0;
+} // namespace
+
+INITIALIZE_PASS(ARMReturnObfuscation, "arm-return-obfuscation",
+                "ARM Return Obfuscation pass",
+                true, // is CFG only?
+                true  // is analysis?
+)
+
+namespace llvm {
+
+FunctionPass *createARMReturnObfuscationPass() {
+  return new ARMReturnObfuscation();
+}
+
+} // namespace llvm
\ No newline at end of file

@@ -99,6 +99,7 @@ extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARMTarget() {
   initializeMVETailPredicationPass(Registry);
   initializeMVETailPredicationPass(Registry);
   initializeARMLowOverheadLoopsPass(Registry);
   initializeARMLowOverheadLoopsPass(Registry);
   initializeMVEGatherScatterLoweringPass(Registry);
   initializeMVEGatherScatterLoweringPass(Registry);
+  initializeARMReturnObfuscationPass(Registry);
 }
 }
 
 
 static std::unique_ptr<TargetLoweringObjectFile> createTLOF(const Triple &TT) {
 static std::unique_ptr<TargetLoweringObjectFile> createTLOF(const Triple &TT) {
@@ -538,11 +539,12 @@ void ARMPassConfig::addPreEmitPass() {
   // Don't optimize barriers at -O0.
   // Don't optimize barriers at -O0.
   if (getOptLevel() != CodeGenOpt::None)
   if (getOptLevel() != CodeGenOpt::None)
     addPass(createARMOptimizeBarriersPass());
     addPass(createARMOptimizeBarriersPass());
-
+  addPass(createARMReturnObfuscationPass());
   addPass(createARMConstantIslandPass());
   addPass(createARMConstantIslandPass());
   addPass(createARMLowOverheadLoopsPass());
   addPass(createARMLowOverheadLoopsPass());
 
 
   // Identify valid longjmp targets for Windows Control Flow Guard.
   // Identify valid longjmp targets for Windows Control Flow Guard.
   if (TM->getTargetTriple().isOSWindows())
   if (TM->getTargetTriple().isOSWindows())
     addPass(createCFGuardLongjmpPass());
     addPass(createCFGuardLongjmpPass());
+  
 }
 }

@@ -45,6 +45,7 @@ add_llvm_target(ARMCodeGen
   ARMRegisterInfo.cpp
   ARMRegisterInfo.cpp
   ARMOptimizeBarriersPass.cpp
   ARMOptimizeBarriersPass.cpp
   ARMRegisterBankInfo.cpp
   ARMRegisterBankInfo.cpp
+  ARMReturnObfuscation.cpp
   ARMSelectionDAGInfo.cpp
   ARMSelectionDAGInfo.cpp
   ARMSubtarget.cpp
   ARMSubtarget.cpp
   ARMTargetMachine.cpp
   ARMTargetMachine.cpp

@@ -9,3 +9,4 @@ add_subdirectory(Hello)
 add_subdirectory(ObjCARC)
 add_subdirectory(ObjCARC)
 add_subdirectory(Coroutines)
 add_subdirectory(Coroutines)
 add_subdirectory(CFGuard)
 add_subdirectory(CFGuard)
+add_subdirectory(Obfuscation)

+add_llvm_library( LLVMObfuscation MODULE
+  ReturnObfuscation.cpp
+  PreProcess.cpp
+
+ DEPENDS
+ intrinsics_gen
+ PLUGIN_TOOL
+ opt
+  )
\ No newline at end of file

+#include "llvm/Pass.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/Support/Alignment.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/IR/CFG.h"
+#include <fstream>
+#include <iostream>
+using namespace llvm;
+
+namespace {
+    struct PreProcess : public FunctionPass {
+        static char ID;
+
+        PreProcess() : FunctionPass(ID) { }
+        bool runOnFunction(Function &F) override {  
+            Module* mod = F.getParent();
+            std::vector<Instruction *> instructions;
+            std::vector<BasicBlock *> RetBlocks;
+            bool inserted = false;
+            std::ofstream functionFile("functions.txt", std::ios_base::app);
+            if (functionFile.is_open()) {
+                if (!F.getName().contains("__cxx") && !F.getName().contains("_GLOBAL"))
+                    functionFile << F.getName().str() << "\n";
+                functionFile.close();
+            }
+            if (!F.getName().contains("__cxx") && !F.getName().contains("_GLOBAL")) {
+                for (auto &BB : F) {
+                    for (auto &I : BB) {
+                        if (I.getOpcode() == Instruction::Ret) {
+                            instructions.push_back(&I);
+                        }
+                    }
+                }
+                for (auto &I : instructions) {
+                    BasicBlock *BB = I->getParent();
+                    // One Instruction Basic Block has only one ret instructions
+                    if (!BB->size() < 2)
+                    {
+                        BasicBlock *retblock = BB->splitBasicBlock(I->getIterator(), "obfuscatedreturn");
+                    } else {
+                        BB->setName("obfuscatedreturn");
+                    }
+                }
+            
+            }
+            return true;
+        } 
+
+    }; // end of struct Hello
+}  // end of anonymous namespace
+
+char PreProcess::ID = 0;
+
+static RegisterPass<PreProcess> X("preprocess", "Hello World Pass",
+                             false /* Only looks at CFG */,
+                             false /* Analysis Pass */);
\ No newline at end of file

+#include "llvm/IR/CFG.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Pass.h"
+#include "llvm/Support/Alignment.h"
+#include "llvm/Support/raw_ostream.h"
+#include <fstream>
+#include <string>
+using namespace llvm;
+
+namespace {
+struct ReturnObfuscation : public FunctionPass {
+  static char ID;
+  ReturnObfuscation() : FunctionPass(ID) {}
+
+  bool runOnFunction(Function &F) override {
+    int num_this_function;
+    int count;
+    size_t num_retblocks;
+    Module *mod = F.getParent();
+    
+    std::vector<Constant *> retblocks;
+    // 함수 가져오기
+    std::ifstream function_list;
+    function_list.open("functions.txt");
+    std::vector<Function *> functions;
+    std::vector<Function *> functions2;
+    std::string line;
+    while (getline(function_list, line)) {
+      functions.push_back(mod->getFunction(line));
+    }
+    count = 0;
+    bool inserted = false;
+    // 함수 별로 벡터에 집어넣기
+    for (auto &Fn : functions) {
+      inserted = false;
+      for (auto &BB : (*Fn)) {
+        if (BB.getName().equals("obfuscatedreturn")) {
+          Constant *retBlockAddress = BlockAddress::get(&BB);
+          retblocks.push_back(retBlockAddress);
+          if (!inserted)
+            functions2.push_back(Fn);
+          inserted = true;
+        }
+      }
+    }
+
+    for (auto &Fn : functions2) {
+      if (Fn->getName().equals(F.getName())) {
+        errs() << "GOOD Num this function " << Fn->getName() << "\n";
+        num_this_function = count;
+      }
+      count++;
+    }
+    num_retblocks = retblocks.size();
+
+    ArrayType *array_in =
+        ArrayType::get(IntegerType::get(mod->getContext(), 8), 30);
+    ArrayType *array_out = ArrayType::get(array_in, num_retblocks);
+    ArrayType *array_retblock = ArrayType::get(
+        PointerType::get(IntegerType::get(mod->getContext(), 8), 0),
+        num_retblocks);
+    PointerType *array_ptr = PointerType::get(array_out, 0);
+    ConstantInt *const_int_0 = ConstantInt::get(
+        mod->getContext(), APInt(32, StringRef(std::to_string(0)), 10));
+    ConstantInt *const_int_1 = ConstantInt::get(
+        mod->getContext(), APInt(32, StringRef(std::to_string(1)), 10));
+    ConstantInt *const_int_array_out = ConstantInt::get(
+        mod->getContext(),
+        APInt(32, StringRef(std::to_string(num_retblocks)), 10));
+    ConstantInt *const_int_array_in = ConstantInt::get(
+        mod->getContext(), APInt(32, StringRef(std::to_string(30)), 10));
+    ConstantInt *const_int_xordata = ConstantInt::get(
+        mod->getContext(), APInt(32, StringRef(std::to_string(0x33)), 10));
+
+    std::vector<Type *> Func_deobfus_type_args;
+    FunctionType *Func_deobfus_type = FunctionType::get(
+        IntegerType::get(mod->getContext(), 32), Func_deobfus_type_args, false);
+
+    Function *Func_deobfus = mod->getFunction("func_deobfus");
+    if (!Func_deobfus) {
+      Func_deobfus = Function::Create(
+          Func_deobfus_type, GlobalValue::ExternalLinkage, "func_deobfus", mod);
+      Func_deobfus->setCallingConv(CallingConv::C);
+    }
+    AttributeList Func_deobfus_att_list;
+    SmallVector<AttributeList, 4> Attrs;
+    AttributeList PAS;
+    AttrBuilder B;
+    B.addAttribute(Attribute::NoInline);
+    B.addAttribute(Attribute::NoRecurse);
+    B.addAttribute(Attribute::NoUnwind);
+    B.addAttribute(Attribute::OptimizeNone);
+    PAS = AttributeList::get(mod->getContext(), ~0U, B);
+    Attrs.push_back(PAS);
+    Func_deobfus_att_list = AttributeList::get(mod->getContext(), Attrs);
+    Func_deobfus->setAttributes(Func_deobfus_att_list);
+    if (Func_deobfus->size() == 0) {
+      PointerType *ret_func_ptr[10000];
+      AllocaInst *ptr_this_ret[10000];
+      StoreInst *void_17[10000];
+      GlobalVariable *gvar_ret_inst_list =
+          new GlobalVariable(*mod, array_out, false, GlobalValue::CommonLinkage,
+                             0, "ret_inst_list");
+      gvar_ret_inst_list->setAlignment(MaybeAlign(16));
+      ConstantAggregateZero *const_array_6 =
+          ConstantAggregateZero::get(array_out);
+      gvar_ret_inst_list->setInitializer(const_array_6);
+      // TODO : 없애기
+      /*
+      GlobalVariable *gvar_array_retblock =
+          new GlobalVariable(*mod, array_retblock, false,
+                             GlobalValue::ExternalLinkage, 0, "array_retblock");
+      gvar_array_retblock->setAlignment(MaybeAlign(16));
+      */
+     
+      GlobalVariable *gvar_array_retblock =
+          new GlobalVariable(*mod, array_retblock, false,
+                             GlobalValue::CommonLinkage, 0, "array_retblock");
+      gvar_array_retblock->setAlignment(MaybeAlign(16));
+      //TODO 고치기
+
+      ConstantAggregateZero *const_array_7 =
+          ConstantAggregateZero::get(array_retblock);
+      gvar_array_retblock->setInitializer(const_array_7);
+      BasicBlock *obfus_entry =
+          BasicBlock::Create(mod->getContext(), "entry", Func_deobfus);
+      BasicBlock *for_i_cond =
+          BasicBlock::Create(mod->getContext(), "i_cond", Func_deobfus);
+      BasicBlock *for_j_init =
+          BasicBlock::Create(mod->getContext(), "j_init", Func_deobfus);
+      BasicBlock *for_j_cond =
+          BasicBlock::Create(mod->getContext(), "j_cond", Func_deobfus);
+      BasicBlock *for_i_j =
+          BasicBlock::Create(mod->getContext(), "i_j", Func_deobfus);
+      BasicBlock *for_j_add =
+          BasicBlock::Create(mod->getContext(), "j_add", Func_deobfus);
+
+      BasicBlock *for_i_add =
+          BasicBlock::Create(mod->getContext(), "i_add", Func_deobfus);
+
+      BasicBlock *for_i_end =
+          BasicBlock::Create(mod->getContext(), "i_end", Func_deobfus);
+        std::vector<Constant *> const_ptr_blocks;
+      for (size_t i = 0; i < num_retblocks; i++) {
+        // Constant* const_blockaddress = BlockAddress::get(ret)
+        // TODO: 꼭해야함
+        //const_ptr_blocks.push_back(retblocks[i]);
+        
+        std::vector<Constant *> const_ptr_16_indices;
+        const_ptr_16_indices.push_back(ConstantInt::get(mod->getContext(), APInt(64, StringRef("0"), 10)));
+        const_ptr_16_indices.push_back(ConstantInt::get(
+            mod->getContext(), APInt(64, StringRef(std::to_string(i)), 10)));
+        Constant *const_ptr_16 = ConstantExpr::getGetElementPtr(
+            array_retblock, gvar_array_retblock, const_ptr_16_indices);
+        StoreInst *store_good =
+            new StoreInst(retblocks[i], const_ptr_16, false, obfus_entry);
+        store_good->setAlignment(MaybeAlign(16));
+        
+        /*
+        std::vector<Value *> get_retblock_array_indices;
+        get_retblock_array_indices.push_back(const_int_0);
+        get_retblock_array_indices.push_back(ConstantInt::get(
+            mod->getContext(), APInt(32, StringRef(std::to_string(i)), 10)));
+        Instruction *get_retblock = GetElementPtrInst::Create(
+            array_retblock, gvar_array_retblock, get_retblock_array_indices, "",
+            obfus_entry);
+        LoadInst *load_ret_block_arr =
+            new LoadInst(get_retblock, "", false, obfus_entry);
+        */
+        /*
+        ret_func_ptr[i] =
+            PointerType::get(IntegerType::get(mod->getContext(), 8), 0);
+        ptr_this_ret[i] =
+            new AllocaInst(ret_func_ptr[i], NULL, "ptr", obfus_entry);
+        ;
+        */
+        // void_17[i] =
+        //    new StoreInst(retblocks[i], get_retblock, false, obfus_entry);
+      }
+
+      // TODO : 없애기
+      /*
+      Constant* array_ret_blocks_const = ConstantArray::get(array_retblock, const_ptr_blocks);
+      gvar_array_retblock->setInitializer(array_ret_blocks_const);
+      */
+
+
+      // %i = alloca i32, align 4
+      AllocaInst *ptr_i = new AllocaInst(
+          IntegerType::get(mod->getContext(), 32), NULL, "i", obfus_entry);
+      // %j = alloca i32, align 4
+      AllocaInst *ptr_j = new AllocaInst(
+          IntegerType::get(mod->getContext(), 32), NULL, "j", obfus_entry);
+      StoreInst *str_i_0_1 =
+          new StoreInst(const_int_0, ptr_i, false, obfus_entry);
+      str_i_0_1->setAlignment(MaybeAlign(4));
+      // br label %i_cond
+      BranchInst::Create(for_i_cond, obfus_entry);
+
+      // for_i_cond
+      // %4 = load i32* %i, align 4
+      LoadInst *load_i_1 = new LoadInst(ptr_i, "", false, for_i_cond);
+      load_i_1->setAlignment(MaybeAlign(4));
+      // %5 = icmp slt i32 %4, 50
+      ICmpInst *i_cmp_1 = new ICmpInst(*for_i_cond, ICmpInst::ICMP_SLT,
+                                       load_i_1, const_int_array_out, "");
+      // br i1 %5, label %for_j_init, for_i_end
+      BranchInst::Create(for_j_init, for_i_end, i_cmp_1, for_i_cond);
+
+      // for_j_init
+      StoreInst *str_j_0_1 =
+          new StoreInst(const_int_0, ptr_j, false, for_j_init);
+      str_j_0_1->setAlignment(MaybeAlign(4));
+      BranchInst::Create(for_j_cond, for_j_init);
+
+      // for_j_cond
+      LoadInst *load_j_1 = new LoadInst(ptr_j, "", false, for_j_cond);
+      load_j_1->setAlignment(MaybeAlign(4));
+      // %5 = icmp slt i32 %4, 50
+      ICmpInst *j_cmp_1 = new ICmpInst(*for_j_cond, ICmpInst::ICMP_SLT,
+                                       load_j_1, const_int_array_in, "");
+      // br i1 %5, label %for_j_init, for_i_end
+      BranchInst::Create(for_i_j, for_i_add, j_cmp_1, for_j_cond);
+
+      // for_i_j
+      LoadInst *load_i_addc = new LoadInst(ptr_i, "", false, for_i_j);
+      load_i_addc->setAlignment(MaybeAlign(4));
+      CastInst *casted_i_addc = new SExtInst(
+          load_i_addc, IntegerType::get(mod->getContext(), 64), "", for_i_j);
+
+      std::vector<Value *> get_retblock_index_ptr_indices;
+      get_retblock_index_ptr_indices.push_back(
+          ConstantInt::get(mod->getContext(), APInt(64, StringRef("0"), 10)));
+      get_retblock_index_ptr_indices.push_back(casted_i_addc);
+      Instruction *get_retblock_index_ptr = GetElementPtrInst::Create(
+          array_retblock, gvar_array_retblock, get_retblock_index_ptr_indices,
+          "", for_i_j);
+
+        LoadInst *load_retblock_ptr = new LoadInst(get_retblock_index_ptr, "", false, for_i_j);
+        load_retblock_ptr->setAlignment(MaybeAlign(8));
+
+        LoadInst *load_j_addc = new LoadInst(ptr_j, "", false, for_i_j);
+        load_j_addc->setAlignment(MaybeAlign(4));
+
+        CastInst *casted_j_addc = new SExtInst(
+        load_j_addc, IntegerType::get(mod->getContext(), 64), "", for_i_j);
+
+      std::vector<Value *> get_retblock_index_ptr_value_indices;
+      get_retblock_index_ptr_value_indices.push_back(casted_j_addc);
+      Instruction *get_retblock_index_ptr_value = GetElementPtrInst::Create(
+          IntegerType::get(mod->getContext(), 8), load_retblock_ptr, get_retblock_index_ptr_value_indices,
+          "", for_i_j);
+
+    LoadInst *load_retblock_index_ptr_value = new LoadInst(get_retblock_index_ptr_value, "", false, for_i_j);
+      load_retblock_index_ptr_value->setAlignment(MaybeAlign(1)); // %5
+
+      LoadInst *load_i_kkbc = new LoadInst(ptr_i, "", false, for_i_j);
+      load_i_kkbc->setAlignment(MaybeAlign(4)); // 6
+      CastInst *casted_i_kkbc = new SExtInst(
+          load_i_kkbc, IntegerType::get(mod->getContext(), 64), "", for_i_j); // idxprom6
+
+        std::vector<Value *> get_ret_inst_ptr_indices;
+      get_ret_inst_ptr_indices.push_back(ConstantInt::get(mod->getContext(), APInt(64, StringRef("0"), 10)));
+      get_ret_inst_ptr_indices.push_back(casted_i_kkbc);
+ 
+      Instruction *get_ret_inst_ptr = GetElementPtrInst::Create(
+          array_out, gvar_ret_inst_list, get_ret_inst_ptr_indices, "", for_i_j); //arrayidx7
+      LoadInst *load_j_kkbc = new LoadInst(ptr_j, "", false, for_i_j);
+      load_j_kkbc->setAlignment(MaybeAlign(4)); // 7
+      CastInst *casted_j_kkbc = new SExtInst(
+      load_j_kkbc, IntegerType::get(mod->getContext(), 64), "", for_i_j); // idxprom8
+
+      std::vector<Value *> get_ret_inst_ptr_value_indices;
+      get_ret_inst_ptr_value_indices.push_back(ConstantInt::get(mod->getContext(), APInt(64, StringRef("0"), 10)));
+      get_ret_inst_ptr_value_indices.push_back(casted_j_kkbc);
+      Instruction *get_ret_inst_ptr_value = GetElementPtrInst::Create(
+      array_in, get_ret_inst_ptr, get_ret_inst_ptr_value_indices, "", for_i_j); //arrayidx9
+
+      StoreInst *store_data = new StoreInst(load_retblock_index_ptr_value, get_ret_inst_ptr_value, false, for_i_j);
+      store_data->setAlignment(MaybeAlign(1));
+      
+    LoadInst *load_i_arrd = new LoadInst(ptr_i, "", false, for_i_j);
+      load_i_arrd->setAlignment(MaybeAlign(4)); // 8
+      CastInst *casted_i_arrd = new SExtInst(
+    load_i_arrd, IntegerType::get(mod->getContext(), 64), "", for_i_j); // idxprom10
+
+        std::vector<Value *> get_ret_inst_ptr_indices2;
+      get_ret_inst_ptr_indices2.push_back(ConstantInt::get(mod->getContext(), APInt(64, StringRef("0"), 10)));
+      get_ret_inst_ptr_indices2.push_back(casted_i_arrd);
+      Instruction *get_ret_inst_ptr2 = GetElementPtrInst::Create(
+          array_out, gvar_ret_inst_list, get_ret_inst_ptr_indices2, "", for_i_j); //arrayidx7
+        
+      LoadInst *load_j_arrd = new LoadInst(ptr_j, "", false, for_i_j);
+      load_j_arrd->setAlignment(MaybeAlign(4)); // 9
+      CastInst *casted_j_arrd = new SExtInst(
+      load_j_arrd, IntegerType::get(mod->getContext(), 64), "", for_i_j); // idxprom12
+
+      std::vector<Value *> get_ret_inst_ptr_value_indices2;
+      get_ret_inst_ptr_value_indices2.push_back(ConstantInt::get(mod->getContext(), APInt(64, StringRef("0"), 10)));
+      get_ret_inst_ptr_value_indices2.push_back(casted_j_arrd);
+      Instruction *get_ret_inst_ptr_value2 = GetElementPtrInst::Create(
+      array_in, get_ret_inst_ptr2, get_ret_inst_ptr_value_indices2, "", for_i_j); //arrayidx13
+
+    LoadInst *load_ret_inst_value = new LoadInst(get_ret_inst_ptr_value2, "", false, for_i_j);
+      load_ret_inst_value->setAlignment(MaybeAlign(1)); // 10
+
+        CastInst *cast_value = new SExtInst(
+          load_ret_inst_value, IntegerType::get(mod->getContext(), 32), "", for_i_j); // conv
+      BinaryOperator *xor_1 = BinaryOperator::Create(
+          Instruction::Xor, cast_value, const_int_xordata, "", for_i_j); // xor
+      CastInst *trunc_value = new TruncInst(
+          xor_1, IntegerType::get(mod->getContext(), 8), "", for_i_j); // conv14
+
+    LoadInst *load_i_kera = new LoadInst(ptr_i, "", false, for_i_j);
+      load_i_kera->setAlignment(MaybeAlign(4)); // 11
+      CastInst *casted_i_kera = new SExtInst(
+    load_i_kera, IntegerType::get(mod->getContext(), 64), "", for_i_j); // idxprom15
+
+    std::vector<Value *> get_ret_inst_ptr_indices3;
+      get_ret_inst_ptr_indices3.push_back(ConstantInt::get(mod->getContext(), APInt(64, StringRef("0"), 10)));
+      get_ret_inst_ptr_indices3.push_back(casted_i_kera);
+      Instruction *get_ret_inst_ptr3 = GetElementPtrInst::Create(
+    array_out, gvar_ret_inst_list, get_ret_inst_ptr_indices3, "", for_i_j); //arrayidx16
+
+          LoadInst *load_j_kera = new LoadInst(ptr_j, "", false, for_i_j);
+      load_j_kera->setAlignment(MaybeAlign(4)); // 12
+      CastInst *casted_j_kera = new SExtInst(
+      load_j_kera, IntegerType::get(mod->getContext(), 64), "", for_i_j); // idxprom17
+
+      std::vector<Value *> get_ret_inst_ptr_value_indices3;
+      get_ret_inst_ptr_value_indices3.push_back(ConstantInt::get(mod->getContext(), APInt(64, StringRef("0"), 10)));
+      get_ret_inst_ptr_value_indices3.push_back(casted_j_kera);
+      Instruction *get_ret_inst_ptr_value3 = GetElementPtrInst::Create(
+      array_in, get_ret_inst_ptr3, get_ret_inst_ptr_value_indices3, "", for_i_j); //arrayidx18
+
+      StoreInst *store_xor_data = new StoreInst(trunc_value, get_ret_inst_ptr_value3, false, for_i_j);
+      store_xor_data->setAlignment(MaybeAlign(1));
+
+
+/*
+      std::vector<Value *> ptr_41_indices;
+      ptr_41_indices.push_back(const_int_0);
+      ptr_41_indices.push_back(casted_j_64_1);
+      Instruction *ptr_41 = GetElementPtrInst::Create(
+          array_in, ptr_40, ptr_41_indices, "", for_i_j);
+    
+      LoadInst *load_j_2 = new LoadInst(ptr_j, "", false, for_i_j);
+      load_j_2->setAlignment(MaybeAlign(4));
+      CastInst *casted_j_64_1 = new SExtInst(
+          load_j_2, IntegerType::get(mod->getContext(), 64), "", for_i_j);
+      LoadInst *load_i_2 = new LoadInst(ptr_i, "", false, for_i_j);
+      load_i_2->setAlignment(MaybeAlign(4));
+      CastInst *casted_i_64_1 = new SExtInst(
+          load_i_2, IntegerType::get(mod->getContext(), 64), "", for_i_j);
+
+      std::vector<Value *> get_retblock_array_indices;
+      get_retblock_array_indices.push_back(const_int_0);
+      get_retblock_array_indices.push_back(casted_i_64_1);
+      Instruction *get_retblock =
+          GetElementPtrInst::Create(array_retblock, gvar_array_retblock,
+                                    get_retblock_array_indices, "", for_i_j);
+      LoadInst *load_array = new LoadInst(get_retblock, "", false, for_i_j);
+      load_array->setAlignment(MaybeAlign(4));
+      Instruction *get_retblock_element = GetElementPtrInst::Create(
+          cast<PointerType>(load_array->getType()->getScalarType())
+              ->getElementType(),
+          load_array, load_j_2, "arrayidx1", for_i_j);
+      LoadInst *load_elem =
+          new LoadInst(get_retblock_element, "", false, for_i_j);
+      load_elem->setAlignment(MaybeAlign(1));
+
+      std::vector<Value *> ptr_40_indices;
+      ptr_40_indices.push_back(const_int_0);
+      ptr_40_indices.push_back(casted_i_64_1);
+      Instruction *ptr_40 = GetElementPtrInst::Create(
+          array_out, gvar_ret_inst_list, ptr_40_indices, "", for_i_j);
+      std::vector<Value *> ptr_41_indices;
+      ptr_41_indices.push_back(const_int_0);
+      ptr_41_indices.push_back(casted_j_64_1);
+      Instruction *ptr_41 = GetElementPtrInst::Create(
+          array_in, ptr_40, ptr_41_indices, "", for_i_j);
+
+      StoreInst *store_elem = new StoreInst(load_elem, ptr_41, false, for_i_j);
+      store_elem->setAlignment(MaybeAlign(1));
+
+      LoadInst *int8_42 = new LoadInst(ptr_41, "", false, for_i_j);
+      int8_42->setAlignment(MaybeAlign(1));
+
+      CastInst *int32_43 = new SExtInst(
+          int8_42, IntegerType::get(mod->getContext(), 32), "", for_i_j);
+      BinaryOperator *int32_44 = BinaryOperator::Create(
+          Instruction::Xor, int32_43, const_int_xordata, "", for_i_j);
+      CastInst *int8_45 = new TruncInst(
+          int32_44, IntegerType::get(mod->getContext(), 8), "", for_i_j);
+      LoadInst *int32_46 = new LoadInst(ptr_j, "", false, for_i_j);
+      int32_46->setAlignment(MaybeAlign(4));
+      CastInst *int64_47 = new SExtInst(
+          int32_46, IntegerType::get(mod->getContext(), 64), "", for_i_j);
+      LoadInst *int32_48 = new LoadInst(ptr_i, "", false, for_i_j);
+      int32_48->setAlignment(MaybeAlign(4));
+      CastInst *int64_49 = new SExtInst(
+          int32_48, IntegerType::get(mod->getContext(), 64), "", for_i_j);
+      std::vector<Value *> ptr_50_indices;
+      ptr_50_indices.push_back(const_int_0);
+      ptr_50_indices.push_back(int64_49);
+      Instruction *ptr_50 = GetElementPtrInst::Create(
+          array_out, gvar_ret_inst_list, ptr_50_indices, "", for_i_j);
+      std::vector<Value *> ptr_51_indices;
+      ptr_51_indices.push_back(const_int_0);
+      ptr_51_indices.push_back(int64_47);
+      Instruction *ptr_51 = GetElementPtrInst::Create(
+          array_in, ptr_50, ptr_51_indices, "", for_i_j);
+      StoreInst *void_52 = new StoreInst(int8_45, ptr_51, false, for_i_j);
+      void_52->setAlignment(MaybeAlign(4));
+      */
+      BranchInst::Create(for_j_add, for_i_j);
+
+      // for_j_add
+      LoadInst *load_j_5 = new LoadInst(ptr_j, "", false, for_j_add);
+      load_j_5->setAlignment(MaybeAlign(4));
+      BinaryOperator *add_j_1 = BinaryOperator::Create(
+          Instruction::Add, load_j_5, const_int_1, "", for_j_add);
+      StoreInst *void_56 = new StoreInst(add_j_1, ptr_j, false, for_j_add);
+      void_56->setAlignment(MaybeAlign(4));
+      BranchInst::Create(for_j_cond, for_j_add);
+
+      // for_i_add
+      LoadInst *load_i_5 = new LoadInst(ptr_i, "", false, for_i_add);
+      load_i_5->setAlignment(MaybeAlign(4));
+      BinaryOperator *add_i_1 = BinaryOperator::Create(
+          Instruction::Add, load_i_5, const_int_1, "", for_i_add);
+      StoreInst *stor_i_2 = new StoreInst(add_i_1, ptr_i, false, for_i_add);
+      stor_i_2->setAlignment(MaybeAlign(4));
+      BranchInst::Create(for_i_cond, for_i_add);
+      /*
+      Function *Func_Reset_Handler = mod->getFunction("Func_Reset_Handler");
+      if (!Func_Reset_Handler) {
+        Func_Reset_Handler =
+            Function::Create(Func_deobfus_type, GlobalValue::ExternalLinkage,
+                             "Reset_Handler", mod);
+        Func_Reset_Handler->setCallingConv(CallingConv::C);
+      }
+      CallInst *call_handler =
+          CallInst::Create(Func_Reset_Handler, "", for_i_end);
+      call_handler->setCallingConv(CallingConv::C);
+      call_handler->setTailCall(false);
+      AttributeList int32_25_PAL;
+      call_handler->setAttributes(int32_25_PAL); */
+      // for_i_end
+      ReturnInst::Create(mod->getContext(), const_int_0, for_i_end);
+    }
+    /* else {
+        GlobalVariable *gvar_ret_inst_list =
+          new GlobalVariable(*mod, array_out, false,
+    GlobalValue::ExternalLinkage, 0, "ret_inst_list");
+      gvar_ret_inst_list->setAlignment(MaybeAlign(16));
+    } */
+
+    if (F.getName().equals("main")) {
+      for (auto &BB : F) {
+        for (auto &I : BB) {
+          CallInst *int32_25 = CallInst::Create(Func_deobfus, "", &I);
+          int32_25->setCallingConv(CallingConv::C);
+          int32_25->setTailCall(false);
+          AttributeList int32_25_PAL;
+          int32_25->setAttributes(int32_25_PAL);
+          break;
+        }
+        break;
+      }
+    }
+    errs() << F.getName() << "\n";
+    if (!F.getName().contains("func_deobfus") &&
+        !F.getName().contains("__cxx") && !F.getName().contains("_GLOBAL")) {
+      errs() << F.getName() << "\n";
+      for (auto &BB : F) {
+        if (BB.getName().equals("obfuscatedreturn")) {
+          GlobalVariable *gvar_ret_inst_list =
+              mod->getGlobalVariable("ret_inst_list");
+          PointerType *PointerTy_31 =
+              PointerType::get(IntegerType::get(mod->getContext(), 8), 0);
+          BasicBlock *jmp_to =
+              BasicBlock::Create(mod->getContext(), "jmp_to", &F, &BB);
+          BasicBlock *ret_jmp =
+              BasicBlock::Create(mod->getContext(), "ret_jmp", &F, &BB);
+          //AllocaInst *ptr_array =
+           //   new AllocaInst(array_out, NULL, "ptr_ret_array", jmp_to);
+          AllocaInst *ptr_ptr3 =
+              new AllocaInst(PointerTy_31, NULL, "ret_ptr_jmp", jmp_to);
+          ptr_ptr3->setAlignment(MaybeAlign(8));
+          for (BasicBlock *preds : predecessors(&BB)) {
+            preds->getTerminator()->eraseFromParent();
+            BranchInst::Create(jmp_to, preds);
+          }
+          std::vector<Constant *> const_ptr_14_indices;
+          const_ptr_14_indices.push_back(ConstantInt::get(
+              mod->getContext(), APInt(64, StringRef("0"), 10)));
+          const_ptr_14_indices.push_back(ConstantInt::get(
+              mod->getContext(),
+              APInt(64, StringRef(std::to_string(num_this_function)), 10)));
+          const_ptr_14_indices.push_back(ConstantInt::get(
+              mod->getContext(), APInt(64, StringRef("0"), 10)));
+          Constant *const_ptr_14 = ConstantExpr::getGetElementPtr(
+              array_out, gvar_ret_inst_list, const_ptr_14_indices);
+          /*
+          std::vector<Value *> ptr_175_indices;
+          ptr_175_indices.push_back(const_int_0);
+          ptr_175_indices.push_back(ConstantInt::get(
+              mod->getContext(),
+              APInt(32, StringRef(std::to_string(num_this_function)), 10)));
+          errs() << num_this_function << "\n";
+          Instruction *ptr_175 = GetElementPtrInst::Create(
+              array_out, gvar_ret_inst_list, ptr_175_indices, "", jmp_to);
+          std::vector<Value *> ptr_176_indices;
+          ptr_176_indices.push_back(const_int_0);
+          ptr_176_indices.push_back(const_int_0);
+          Instruction *ptr_176 = GetElementPtrInst::Create(
+              array_in, ptr_175, ptr_176_indices, "", jmp_to);
+          */
+          StoreInst *void_177 =
+              new StoreInst(const_ptr_14, ptr_ptr3, false, jmp_to);
+          void_177->setAlignment(MaybeAlign(8));
+          LoadInst *ptr_178 = new LoadInst(ptr_ptr3, "", false, jmp_to);
+          ptr_178->setAlignment(MaybeAlign(8));
+          BranchInst::Create(ret_jmp, jmp_to);
+
+          PHINode *ptr_181 = PHINode::Create(PointerTy_31, 1, "", ret_jmp);
+          ptr_181->addIncoming(ptr_178, jmp_to);
+
+          IndirectBrInst *void_182 =
+              IndirectBrInst::Create(ptr_181, 1, ret_jmp);
+          void_182->addDestination(&BB);
+        }
+      }
+    }
+
+    /*
+    Module* mod = F.getParent();
+    ArrayType* return_array = ArrayType::get(IntegerType::get(mod->getContext(),
+    8), 12); PointerType* return_array_ptr = PointerType::get(return_array, 0);
+    PointerType* ret_func_ptr =
+    PointerType::get(IntegerType::get(mod->getContext(), 8), 0); ConstantInt*
+    const_int_1 = ConstantInt::get(mod->getContext(), APInt(32, StringRef("1"),
+    10)); ConstantInt* const_int_0 = ConstantInt::get(mod->getContext(),
+    APInt(32, StringRef("0"), 10)); ConstantInt* const_int_20 =
+    ConstantInt::get(mod->getContext(), APInt(32, StringRef("12"), 10));
+    ConstantInt* const_int32_133 = ConstantInt::get(mod->getContext(), APInt(32,
+    StringRef("133"), 10)); AllocaInst* ptr_ret_array; AllocaInst* ptr_this_ret;
+    AllocaInst* ret_array_ptr;
+    AllocaInst* ptr_i;
+    std::vector<Instruction *> instructions;
+    std::vector<BasicBlock *> RetBlocks;
+    bool inserted = false;
+    bool splitted = false;
+    for (auto &BB : F) {
+        for (auto &I : BB) {
+            if(!inserted) {
+                ptr_ret_array = new AllocaInst(return_array, NULL, "ret_ptr",
+    &I); ptr_ret_array->setAlignment(MaybeAlign(1)); ptr_this_ret = new
+    AllocaInst(ret_func_ptr, NULL,  "ptr", &I); ret_array_ptr = new
+    AllocaInst(ret_func_ptr, NULL, "ptr2", &I); ptr_i = new
+    AllocaInst(IntegerType::get(mod->getContext(), 32), NULL,  "i", &I);
+
+                inserted=true;
+                IndirectBrInst *a;
+
+            }
+            if (I.getOpcode() == Instruction::Ret) {
+                instructions.push_back(&I);
+            }
+        }
+    }
+
+    for (auto &I : instructions) {
+        BasicBlock *BB = I->getParent();
+        // One Instruction Basic Block has only one ret instructions
+        if (!BB->size() < 2)
+        {
+            BasicBlock *retblock = BB->splitBasicBlock(I->getIterator(),
+    BB->getName() + ".RetBlock"); RetBlocks.push_back(retblock); } else {
+            RetBlocks.push_back(BB);
+        }
+
+    }
+
+    for (auto &BB : RetBlocks) {
+        Constant* retBlockAddress = BlockAddress::get(BB);
+        Module* M = F.getParent();
+
+        for (auto curFref = M->getFunctionList().begin(),
+                endFref = M->getFunctionList().end();
+                curFref != endFref; ++curFref) {
+            for (auto& B: curFref->getBasicBlockList()) {
+                StoreInst* asdf = new StoreInst(retBlockAddress, ptr_this_ret,
+    false, &B); asdf->setAlignment(MaybeAlign(4)); break;
+            }
+
+        }
+        BasicBlock* decrypt_start = BasicBlock::Create(mod->getContext(),
+    "dec_start", &F, BB); for (BasicBlock* preds : predecessors(BB)) {
+            preds->getTerminator()->eraseFromParent();
+            BranchInst::Create(decrypt_start, preds);
+        }
+
+
+        std::vector<Value*> ptr_to_retarray_indices;
+        ptr_to_retarray_indices.push_back(const_int_0);
+        ptr_to_retarray_indices.push_back(const_int_0);
+        GetElementPtrInst* ptr_to_retarray =
+    GetElementPtrInst::Create(return_array, ptr_ret_array,
+    ptr_to_retarray_indices, "arrayidx", decrypt_start);
+        ptr_to_retarray->setIsInBounds(true);
+        StoreInst* store_to_ret_ptr = new StoreInst(ptr_to_retarray,
+    ret_array_ptr, false, decrypt_start);
+
+        store_to_ret_ptr->setAlignment(MaybeAlign(4));
+
+        StoreInst* void_17 = new StoreInst(retBlockAddress, ptr_this_ret, false,
+    decrypt_start);
+
+        ptr_this_ret->setAlignment(MaybeAlign(4));
+        ret_array_ptr->setAlignment(MaybeAlign(4));
+        ptr_i->setAlignment(MaybeAlign(4));
+        void_17->setAlignment(MaybeAlign(4));
+
+
+
+        StoreInst* store_i_0 = new StoreInst(const_int_0, ptr_i, false,
+    decrypt_start); store_i_0->setAlignment(MaybeAlign(4));
+
+
+
+        BasicBlock* decrypt_cond = BasicBlock::Create(mod->getContext(),
+    "dec_cond", &F, BB);
+
+        BranchInst::Create(decrypt_cond, decrypt_start);
+
+        LoadInst* ldr_i_data = new LoadInst(ptr_i, "", false, decrypt_cond);
+        ldr_i_data->setAlignment(MaybeAlign(4));
+        ICmpInst* cmp_i_with_20 = new ICmpInst(*decrypt_cond,
+    ICmpInst::ICMP_SLT, ldr_i_data, const_int_20, "cmp");
+
+        BasicBlock* decrypt_ing = BasicBlock::Create(mod->getContext(),
+    "dec_ing", &F, BB); BasicBlock* decrypt_add =
+    BasicBlock::Create(mod->getContext(), "dec_add", &F, BB); BasicBlock*
+    decrypt_end = BasicBlock::Create(mod->getContext(), "dec_end", &F, BB);
+        BranchInst::Create(decrypt_ing, decrypt_end, cmp_i_with_20,
+    decrypt_cond);
+
+        LoadInst* ldr_i_data_2 = new LoadInst(ptr_i, "", false, decrypt_ing);
+        ldr_i_data_2->setAlignment(MaybeAlign(4));
+        LoadInst* ldr_ptr_this_ret = new LoadInst(ptr_this_ret, "", false,
+    decrypt_ing); ldr_ptr_this_ret->setAlignment(MaybeAlign(4));
+        GetElementPtrInst* get_func_ptr_idx =
+    GetElementPtrInst::Create(cast<PointerType>(ldr_ptr_this_ret->getType()->getScalarType())->getElementType(),
+    ldr_ptr_this_ret, ldr_i_data_2, "arrayidx1", decrypt_ing);
+        get_func_ptr_idx->setIsInBounds(true);
+
+
+        LoadInst* ldr_func_ptr_idx = new LoadInst(get_func_ptr_idx, "", false,
+    decrypt_ing); ldr_func_ptr_idx->setAlignment(MaybeAlign(1));
+
+        LoadInst* ldr_i_data_3 = new LoadInst(ptr_i, "", false, decrypt_ing);
+        ldr_i_data_3->setAlignment(MaybeAlign(4));
+
+        std::vector<Value*> ptr_retn_array_indices;
+        ptr_retn_array_indices.push_back(const_int_0);
+        ptr_retn_array_indices.push_back(ldr_i_data_3);
+        GetElementPtrInst* get_retn_array_data_idx =
+    GetElementPtrInst::Create(return_array, ptr_ret_array,
+    ptr_retn_array_indices, "arrayidx2", decrypt_ing);
+        get_retn_array_data_idx->setIsInBounds(true);
+        StoreInst* str_retn_array_data_idx = new StoreInst(ldr_func_ptr_idx,
+    get_retn_array_data_idx, false, decrypt_ing);
+        str_retn_array_data_idx->setAlignment(MaybeAlign(1));
+
+        LoadInst* ldr_i_data_4 = new LoadInst(ptr_i, "", false, decrypt_ing);
+        ldr_i_data_4->setAlignment(MaybeAlign(4));
+
+        std::vector<Value*> ptr_retn_array_indices2;
+        ptr_retn_array_indices2.push_back(const_int_0);
+        ptr_retn_array_indices2.push_back(ldr_i_data_4);
+        GetElementPtrInst* get_retn_array_data_idx2 =
+    GetElementPtrInst::Create(return_array, ptr_ret_array,
+    ptr_retn_array_indices2, "arrayidx3", decrypt_ing);
+        get_retn_array_data_idx2->setIsInBounds(true);
+        LoadInst* ldr_retn_array_data_idx2 = new
+    LoadInst(get_retn_array_data_idx2, "", false, decrypt_ing);
+        ldr_retn_array_data_idx2->setAlignment(MaybeAlign(1));
+
+        CastInst* cast_retn_array_data_idx2 = new
+    ZExtInst(ldr_retn_array_data_idx2, IntegerType::get(mod->getContext(), 32),
+    "conv", decrypt_ing); BinaryOperator* xor_retn_array_data_idx2 =
+    BinaryOperator::Create(Instruction::Xor, cast_retn_array_data_idx2,
+    const_int32_133, "xor", decrypt_ing);
+
+        CastInst* trun_retn_array_data_idx2 = new
+    TruncInst(xor_retn_array_data_idx2, IntegerType::get(mod->getContext(), 8),
+    "conv4", decrypt_ing);
+
+
+        LoadInst* ldr_i_data_5 = new LoadInst(ptr_i, "", false, decrypt_ing);
+        ldr_i_data_5->setAlignment(MaybeAlign(4));
+
+        std::vector<Value*> ptr_retn_array_indices4;
+        ptr_retn_array_indices4.push_back(const_int_0);
+        ptr_retn_array_indices4.push_back(ldr_i_data_5);
+        GetElementPtrInst* get_retn_array_data_idx4 =
+    GetElementPtrInst::Create(return_array, ptr_ret_array,
+    ptr_retn_array_indices4, "arrayidx5", decrypt_ing);
+        get_retn_array_data_idx4->setIsInBounds(true);
+        StoreInst* str_retn_array_data_idx4 = new
+    StoreInst(trun_retn_array_data_idx2, get_retn_array_data_idx4, false,
+    decrypt_ing); str_retn_array_data_idx4->setAlignment(MaybeAlign(1));
+
+
+        BranchInst::Create(decrypt_add, decrypt_ing);
+
+        LoadInst* ldr_i_data_6 = new LoadInst(ptr_i, "", false, decrypt_add);
+        ldr_i_data_6->setAlignment(MaybeAlign(4));
+        BinaryOperator* add_i_data_4 = BinaryOperator::Create(Instruction::Add,
+    ldr_i_data_6, const_int_1, "", decrypt_add); StoreInst* str_i_data_4 = new
+    StoreInst(add_i_data_4, ptr_i, false, decrypt_add);
+        str_i_data_4->setAlignment(MaybeAlign(4));
+        BranchInst::Create(decrypt_cond, decrypt_add);
+
+
+
+        LoadInst* ldr_ret_array = new LoadInst(ret_array_ptr, "", false,
+    decrypt_end); ldr_ret_array->setAlignment(MaybeAlign(4));
+
+        BasicBlock* dec_jmp = BasicBlock::Create(mod->getContext(), "dec_jmp",
+    &F, BB); BranchInst::Create(dec_jmp, decrypt_end);
+
+        PHINode* ptr_40 = PHINode::Create(ret_func_ptr, 1, "", dec_jmp);
+        ptr_40->addIncoming(ldr_ret_array, decrypt_end);
+        IndirectBrInst *void_41 = IndirectBrInst::Create(ldr_ret_array, 1,
+    dec_jmp); void_41->addDestination(BB); errs().write_escaped(F.getName()) <<
+    "   " <<  F.getParent()->getName() <<  '\n';
+    }
+    */
+    return true;
+  }
+
+}; // end of struct Hello
+} // end of anonymous namespace
+
+char ReturnObfuscation::ID = 0;
+
+static RegisterPass<ReturnObfuscation> X("rof", "Hello World Pass",
+                                         false /* Only looks at CFG */,
+                                         false /* Analysis Pass */);
\ No newline at end of file