Libspark fuzzing harness

src/crypto/progpow.h

@@ -45,4 +45,4 @@ uint256 progpow_hash_full(const CProgPowHeader& header, uint256& mix_hash);
 /* Performs a light progpow hash (DAG loops excluded) provided header has mix_hash */
 uint256 progpow_hash_light(const CProgPowHeader& header);
 
-#endif // FIRO_PROGPOW_H
+#endif // FIRO_PROGPOW_H

src/fuzz/Makefile

@@ -0,0 +1,134 @@
+CXX := hfuzz-clang++
+
+CXXFLAGS := -DHAVE_CONFIG_H -I../../src/  -iquote ../../src/config/  -iquote ../secp256k1/  -iquote ../secp256k1/src/  -iquote ../secp256k1/include/
+CXXFLAGS2 := -DHAVE_CONFIG_H
+
+LIBS := -lcrypto -lstdc++ -lboost_thread -lboost_filesystem -lboost_program_options -lboost_chrono
+LIBS2 := -lstdc++ -lcrypto
+
+INCLUDE_HEADER := -include ../streams.h -include ../version.h
+
+BPPLUS_SRCS := libspark/bpplus_fuzz.cpp ../libspark/bpplus.cpp ../libspark/util.cpp fuzzing_utilities.cpp ../libspark/hash.cpp ../libspark/kdf.cpp ../libspark/transcript.cpp ../crypto/aes.cpp ../crypto/chacha20.cpp ../crypto/sha512.cpp ../secp256k1/src/cpp/Scalar.cpp ../secp256k1/src/cpp/GroupElement.cpp ../secp256k1/src/cpp/MultiExponent.cpp ../support/cleanse.cpp ../util.cpp ../utiltime.cpp ../utilstrencodings.cpp ../random.cpp ../chainparamsbase.cpp
+BPPLUS_OUTPUT := libspark/bpplus_hfuzz
+BPPLUS_OUTPUT_DEBUG := libspark/bpplus_debug
+
+BECH32_SRCS := libspark/bech32_fuzz_2.cpp ../libspark/bech32.cpp
+BECH32_OUTPUT := libspark/bech32_hfuzz
+BECH32_OUTPUT_DEBUG := libspark/bech32_debug
+
+AEAD_SRCS := libspark/aead_fuzz.cpp ../libspark/aead.cpp ../libspark/util.cpp ../libspark/kdf.cpp ../libspark/hash.cpp ../fuzz/fuzzing_utilities.cpp ../crypto/aes.cpp ../support/lockedpool.cpp ../support/cleanse.cpp ../secp256k1/src/cpp/Scalar.cpp ../secp256k1/src/cpp/GroupElement.cpp
+AEAD_OUTPUT := libspark/aead_hfuzz
+AEAD_OUTPUT_DEBUG := libspark/aead_debug
+
+GROOTLE_SRCS := libspark/grootle_fuzz.cpp ../libspark/grootle.cpp ../libspark/util.cpp fuzzing_utilities.cpp ../libspark/hash.cpp ../libspark/kdf.cpp ../libspark/transcript.cpp ../crypto/aes.cpp ../crypto/chacha20.cpp ../crypto/sha512.cpp ../secp256k1/src/cpp/Scalar.cpp ../secp256k1/src/cpp/GroupElement.cpp ../secp256k1/src/cpp/MultiExponent.cpp ../support/cleanse.cpp  ../util.cpp ../utiltime.cpp ../utilstrencodings.cpp ../random.cpp ../chainparamsbase.cpp
+GROOTLE_OUTPUT := libspark/grootle_hfuzz
+GROOTLE_OUTPUT_DEBUG := libspark/grootle_debug
+
+CHAUM_SRCS := libspark/chaum_fuzz.cpp ../libspark/chaum.cpp ../libspark/transcript.cpp fuzzing_utilities.cpp ../secp256k1/src/cpp/Scalar.cpp ../secp256k1/src/cpp/GroupElement.cpp  ../secp256k1/src/cpp/MultiExponent.cpp  ../support/cleanse.cpp
+CHAUM_OUTPUT := libspark/chaum_hfuzz
+CHAUM_OUTPUT_DEBUG := libspark/chaum_debug
+
+SCHNORR_SRCS := libspark/schnorr_fuzz.cpp ../libspark/schnorr.cpp  ../fuzz/fuzzing_utilities.cpp ../secp256k1/src/cpp/Scalar.cpp ../secp256k1/src/cpp/GroupElement.cpp ../secp256k1/src/cpp/MultiExponent.cpp ../libspark/transcript.cpp  ../support/cleanse.cpp
+SCHNORR_OUTPUT := libspark/schnorr_hfuzz
+SCHNORR_OUTPUT_DEBUG := libspark/schnorr_debug
+
+COIN_SRCS := libspark/coin_fuzz.cpp ../libspark/coin.cpp ../libspark/params.cpp ../crypto/aes.cpp ../crypto/ripemd160.cpp ../crypto/sha256.cpp ../secp256k1/src/cpp/Scalar.cpp ../secp256k1/src/cpp/GroupElement.cpp ../secp256k1/src/cpp/MultiExponent.cpp  ../support/*.cpp ../uint256.cpp ../utilstrencodings.cpp fuzzing_utilities.cpp ../libspark/aead.cpp ../libspark/util.cpp ../libspark/keys.cpp  ../libspark/f4grumble.cpp ../libspark/hash.cpp  ../libspark/bech32.cpp ../libspark/kdf.cpp
+COIN_OUTPUT := libspark/coin_hfuzz
+COIN_OUTPUT_DEBUG := libspark/coin_debug
+
+MINT_TRANSACTION_SRCS := libspark/mint_transaction_fuzz.cpp ../libspark/mint_transaction.cpp ../libspark/coin.cpp ../libspark/keys.cpp ../libspark/schnorr.cpp ../fuzz/fuzzing_utilities.cpp ../libspark/util.cpp ../libspark/hash.cpp ../libspark/kdf.cpp ../libspark/transcript.cpp ../libspark/f4grumble.cpp ../libspark/params.cpp ../libspark/bech32.cpp ../libspark/aead.cpp ../crypto/aes.cpp ../crypto/ripemd160.cpp ../crypto/sha256.cpp ../secp256k1/src/cpp/Scalar.cpp ../secp256k1/src/cpp/GroupElement.cpp ../secp256k1/src/cpp/MultiExponent.cpp ../support/cleanse.cpp ../uint256.cpp ../utilstrencodings.cpp
+MINT_TRANSACTION_OUTPUT := libspark/mint_transaction_hfuzz
+MINT_TRANSACTION_OUTPUT_DEBUG := libspark/mint_transaction_debug
+
+SPEND_TRANSACTION_SRCS := libspark/spend_transaction_fuzz.cpp ../libspark/spend_transaction.cpp ../libspark/coin.cpp ../libspark/keys.cpp ../libspark/schnorr.cpp ../fuzz/fuzzing_utilities.cpp ../libspark/util.cpp ../libspark/hash.cpp ../libspark/kdf.cpp ../libspark/transcript.cpp ../libspark/f4grumble.cpp ../libspark/params.cpp ../libspark/bech32.cpp ../libspark/aead.cpp ../libspark/chaum.cpp ../libspark/bpplus.cpp ../libspark/grootle.cpp ../crypto/aes.cpp ../crypto/ripemd160.cpp ../crypto/sha256.cpp ../crypto/chacha20.cpp ../crypto/sha512.cpp ../secp256k1/src/cpp/Scalar.cpp ../secp256k1/src/cpp/GroupElement.cpp ../secp256k1/src/cpp/MultiExponent.cpp ../support/cleanse.cpp ../uint256.cpp ../utilstrencodings.cpp ../util.cpp ../utiltime.cpp ../chainparamsbase.cpp ../random.cpp
+SPEND_TRANSACTION_OUTPUT := libspark/spend_transaction_hfuzz
+SPEND_TRANSACTION_OUTPUT_DEBUG := libspark/spend_transaction_debug
+
+F4GRUMBLE_SRCS := libspark/f4grumble_fuzz.cpp ../libspark/f4grumble.cpp  ../libspark/util.cpp ../libspark/kdf.cpp ../libspark/hash.cpp ../crypto/aes.cpp ../support/lockedpool.cpp ../support/cleanse.cpp ../secp256k1/src/cpp/Scalar.cpp ../secp256k1/src/cpp/GroupElement.cpp
+F4GRUMBLE_OUTPUT := libspark/f4grumble_hfuzz
+F4GRUMBLE_OUTPUT_DEBUG := libspark/f4grumble_debug
+
+DEBUG_FLAGS := -g -O0 -ggdb 
+
+bpplus: $(BPPLUS_OUTPUT)
+$(BPPLUS_OUTPUT): $(BPPLUS_SRCS)
+	$(CXX) $(CXXFLAGS) $^ -o $@ $(LIBS)
+
+bpplus_debug: $(BPPLUS_OUTPUT_DEBUG)
+$(BPPLUS_OUTPUT_DEBUG): $(BPPLUS_SRCS)
+	$(CXX) $(DEBUG_FLAGS) $(CXXFLAGS) $^ -o $@ $(LIBS)
+
+bech32: $(BECH32_OUTPUT)
+$(BECH32_OUTPUT): $(BECH32_SRCS)
+	$(CXX) $(CXXFLAGS2) $^ -o $@ $(LIBS2)
+
+bech32_debug: $(BECH32_OUTPUT_DEBUG)
+$(BECH32_OUTPUT_DEBUG): $(BECH32_SRCS)
+	$(CXX) $(DEBUG_FLAGS) $(CXXFLAGS2) $^ -o $@ $(LIBS2)
+
+aead: $(AEAD_OUTPUT)
+$(AEAD_OUTPUT): $(AEAD_SRCS)
+	$(CXX) $(CXXFLAGS) $^ -o $@ $(LIBS2)
+
+aead_debug: $(AEAD_OUTPUT_DEBUG)
+$(AEAD_OUTPUT_DEBUG): $(AEAD_SRCS)
+	$(CXX) $(DEBUG_FLAGS) $(CXXFLAGS) $^ -o $@ $(LIBS2)
+
+grootle: $(GROOTLE_OUTPUT)
+$(GROOTLE_OUTPUT): $(GROOTLE_SRCS)
+	$(CXX) $(CXXFLAGS) $^ -o $@ $(LIBS)
+
+grootle_debug: $(GROOTLE_OUTPUT_DEBUG)
+$(GROOTLE_OUTPUT_DEBUG): $(GROOTLE_SRCS)
+	$(CXX) $(DEBUG_FLAGS) $(CXXFLAGS) $^ -o $@ $(LIBS)
+
+chaum: $(CHAUM_OUTPUT)
+$(CHAUM_OUTPUT): $(CHAUM_SRCS)
+	$(CXX) $(CXXFLAGS) $^ -o $@ $(INCLUDE_HEADER) $(LIBS)
+
+chaum_debug: $(CHAUM_OUTPUT_DEBUG)
+$(CHAUM_OUTPUT_DEBUG): $(CHAUM_SRCS)
+	$(CXX) $(DEBUG_FLAGS) $(CXXFLAGS2) $^ -o $@ $(INCLUDE_HEADER) $(LIBS)
+
+schnorr: $(SCHNORR_OUTPUT)
+$(SCHNORR_OUTPUT): $(SCHNORR_SRCS)
+	$(CXX) $(CXXFLAGS) $^ -o $@ $(INCLUDE_HEADER) $(LIBS)
+
+schnorr_debug: $(SCHNORR_OUTPUT_DEBUG)
+$(SCHNORR_OUTPUT_DEBUG): $(SCHNORR_SRCS)
+	$(CXX) $(DEBUG_FLAGS) $(CXXFLAGS) $^ -o $@ $(INCLUDE_HEADER) $(LIBS)
+
+coin: $(COIN_OUTPUT)
+$(COIN_OUTPUT): $(COIN_SRCS)
+	$(CXX) $(CXXFLAGS) $^ -o $@ $(LIBS)
+
+coin_debug: $(COIN_OUTPUT_DEBUG)
+$(COIN_OUTPUT_DEBUG): $(COIN_SRCS)
+	$(CXX) $(DEBUG_FLAGS) $(CXXFLAGS) $^ -o $@ $(LIBS)
+
+mint_transaction: $(MINT_TRANSACTION_OUTPUT)
+$(MINT_TRANSACTION_OUTPUT): $(MINT_TRANSACTION_SRCS)
+	$(CXX) $(CXXFLAGS) $^ -o $@ $(LIBS2)
+
+mint_transaction_debug: $(MINT_TRANSACTION_OUTPUT_DEBUG)
+$(MINT_TRANSACTION_OUTPUT_DEBUG): $(MINT_TRANSACTION_SRCS)
+	$(CXX) $(DEBUG_FLAGS) $(CXXFLAGS2) $^ -o $@ $(LIBS2)
+
+spend_transaction: $(SPEND_TRANSACTION_OUTPUT)
+$(SPEND_TRANSACTION_OUTPUT): $(SPEND_TRANSACTION_SRCS)
+	$(CXX) $(CXXFLAGS) $^ -o $@ $(LIBS)
+
+spend_transaction_debug: $(SPEND_TRANSACTION_OUTPUT_DEBUG)
+$(SPEND_TRANSACTION_OUTPUT_DEBUG): $(SPEND_TRANSACTION_SRCS)
+	$(CXX) $(DEBUG_FLAGS) $(CXXFLAGS) $^ -o $@ $(LIBS)
+
+f4grumble: $(F4GRUMBLE_OUTPUT)
+$(F4GRUMBLE_OUTPUT): $(F4GRUMBLE_SRCS)
+	$(CXX) $(CXXFLAGS) $^ -o $@ $(LIBS)
+
+f4grumble_debug: $(F4GRUMBLE_OUTPUT_DEBUG)
+$(F4GRUMBLE_OUTPUT_DEBUG): $(F4GRUMBLE_SRCS)
+	$(CXX) $(DEBUG_FLAGS) $(CXXFLAGS) $^ -o $@ $(LIBS)
+
+clean:
+	rm -f $(BPPLUS_OUTPUT) $(BPPLUS_OUTPUT_DEBUG) $(BECH32_OUTPUT) $(BECH32_OUTPUT_DEBUG) $(AEAD_OUTPUT) $(AEAD_OUTPUT_DEBUG) $(GROOTLE_OUTPUT) $(GROOTLE_OUTPUT_DEBUG) $(CHAUM_OUTPUT) $(CHAUM_OUTPUT_DEBUG) $(SCHNORR_OUTPUT) $(SCHNORR_OUTPUT_DEBUG) $(COIN_OUTPUT) $(COIN_OUTPUT_DEBUG) $(MINT_TRANSACTION_OUTPUT) $(MINT_TRANSACTION_OUTPUT_DEBUG) $(SPEND_TRANSACTION_OUTPUT) $(SPEND_TRANSACTION_OUTPUT_DEBUG) *.o

src/fuzz/README.md

@@ -0,0 +1,117 @@
+# Fuzzing libspark
+
+## Quickstart Guide
+* Dependencies
+1. Install honggfuzz (https://github.com/google/honggfuzz)
+```
+sudo apt-get install binutils-dev libunwind-dev libblocksruntime-dev clang
+git clone https://github.com/google/honggfuzz.git
+cd honggfuzz
+make
+sudo make install
+```
+
+2. Build firo
+Follow the instructions from https://github.com/firoorg/firo/tree/spark#readme
+
+* In order to fuzz `firo/src/libpark` using LLVM LibFuzzer:
+
+```
+git clone -b spark_fuzz_blog https://github.com/hashcloak/firo.git
+cd firo/src/fuzz/
+export CC=hfuzz-clang
+export CXX=hfuzz-clang++
+```
+
+To compile with `hfuzz-clang++`:
+
+```
+cd src/fuzz/
+make <filename>
+```
+
+For example(for bpplus):
+```
+cd src/fuzz/
+make bpplus
+```
+The above command will generate an instrumented binary with name `<filename>_hfuzz` (eg: bpplus_hfuzz) inside src/fuzz/libspark.
+The fuzzing harness of the following spark files is availabe: aead, bech32, bpplus, chaum, coin, f4grumble, grootle, mint_transaction, schnorr and spend_transaction.
+
+* To start fuzzing:
+
+1. create a directory to save all the crahses.
+2. Inside the directory run:
+```
+hongfuzz -i <path_of_input_corpora>/<filename_inputs> -- ./<filename_hfuzz> ___FILE___
+```
+
+example: 
+1. `mkdir src/fuzz/bpplus_results && cd src/fuzz/bpplus_results`
+2. `hongfuzz -i ../../inputs/bpplus_inputs -- ./../../libspark/bpplus_hfuzz ___FILE___`
+3. To stop press `ctrl+c`
+
+If there is no input corpora, empty corpora can be provided.
+
+### Analyzing the crashes
+
+If there is a crash, the reason for the crash can be found simply by running 
+```
+./<binary_file> <input_file>
+```
+
+Example:
+```
+./bpplus_hfuzz SIGABRT.PC.7ffff7a8400b.STACK.1b5b5f0067.CODE.-6.ADDR.0.INSTR.mov____0x108(%rsp),%rax
+```
+
+To debug or to do the rootcause analysis, gdb debugger can be used. to debug using gdb debugger:
+
+1. First compile the harness using gdb flags `-g -O0 -ggdb`. To compile using gdb debugger, inside `src/fuzz` run:
+```
+make <filename_debug>
+```
+Example: 
+```
+make bpplus_debug
+```
+
+2. start the debugger by running:
+```
+gdb --args <filename_debug> <crashed_input>
+```
+Example:
+```
+gdb --args bpplus_debug SIGABRT.PC.7ffff7a8400b.STACK.1b5b5f0067.CODE.-6.ADDR.0.INSTR.mov____0x108(%rsp),%rax
+```
+This will start the debugger.
+
+3. You can do heap analysis by running `heap-analysis` inside the debugger and/or `bt` for backtracing.
+
+
+### Generating a Coverage Report using kcov
+* Install kcov (https://github.com/SimonKagstrom/kcov/tree/master)
+```
+sudo apt-get install binutils-dev libssl-dev libcurl4-openssl-dev zlib1g-dev libdw-dev libiberty-dev
+git clone https://github.com/SimonKagstrom/kcov.git
+cd /path/to/kcov/source/dir
+mkdir build
+cd build
+cmake ..
+make
+sudo make install
+```
+Once successfully installed, follow the below instructions to generate the code-coverage
+
+1. First compile the harness with gdb flag. run `make <filename>_debug` inside src/fuzz to compile using gdb debugger.
+2. take the input_folder as the input corpora from fuzzing or one can also create it by running: `honggfuzz -i <input_folder> -– ./<filename>_hfuzz ___FILE___ @@`. This will start the fuzzer. Kill it by `ctrl+C`. The fuzzer will generate some random inputs inside the input_folder. Since kcov will generate coverage for each input inside the input_folder, it's preffered to have only a few inputs, otherwise it will take a long time to generate the entire coverage.
+
+3. inside the `generate_coverage.sh` replace the input_folder, output_folder and fuzz_exe by your inpur corpora, coverage output folder and harness binary.
+4. run `./generate_coverage.sh`. This will generated a merged output for all the inputs present in the input_folder.
+5. To view the result run run `firefox ./merged-output/index.html`.
+
+6. alternatively or if you are on a VM, go inside coverage output folder and then merged-output
+7. run `python3 -m http.server`. This will start a http server at http://0.0.0.0:8000/
+8. open your browser and paste http://0.0.0.0:8000/ to see the result.
+
+NOTE: to view the coverage for every dependent file, `generate_coverage.sh` should be in the root folder. Also, you should either delete the previous port or start the server on new port by running `python3 -m http.server <port_number>` for different files.

src/fuzz/fuzzing_utilities.cpp

@@ -0,0 +1,89 @@
+#include "fuzzing_utilities.h"
+
+FuzzedSecp256k1Object::FuzzedSecp256k1Object(FuzzedDataProvider *fdp) {
+    this->fdp = fdp;
+}
+
+secp_primitives::GroupElement FuzzedSecp256k1Object::GetGroupElement() {
+    char* x = (char *)this->fdp->ConsumeBytes<uint8_t>(256).data();
+    char* y = (char *)this->fdp->ConsumeBytes<uint8_t>(256).data();
+    secp_primitives::GroupElement ge = secp_primitives::GroupElement(x, y);
+
+    return ge;
+}
+
+secp_primitives::Scalar FuzzedSecp256k1Object::GetScalar() {
+    uint64_t value = this->fdp->ConsumeIntegral<uint64_t>();
+    secp_primitives::Scalar s = secp_primitives::Scalar(value);
+
+    return s;
+}
+
+secp_primitives::GroupElement FuzzedSecp256k1Object::GetMemberGroupElement() {
+    secp_primitives::GroupElement ge;
+    ge.randomize();
+    return ge;
+}
+
+std::vector<secp_primitives::GroupElement> FuzzedSecp256k1Object::GetMemberGroupElements(size_t len) {
+    std::vector<secp_primitives::GroupElement> ge_vec;
+    ge_vec.resize(len);
+    for (size_t i = 0; i <= len; i++) {
+        ge_vec[i] = (GetMemberGroupElement());
+    }
+    return ge_vec;
+}
+
+std::vector<secp_primitives::GroupElement> FuzzedSecp256k1Object::GetRandomGroupVector(size_t len) {
+    std::vector<secp_primitives::GroupElement> result;
+    result.resize(len);
+    for (size_t i = 0; i < len; i++) {
+        result[i].randomize();
+    }
+    return result;
+}
+
+std::vector<secp_primitives::GroupElement> FuzzedSecp256k1Object::GetGroupElements(int len) {
+    std::vector<secp_primitives::GroupElement> ge_vec;
+    ge_vec.resize(len);
+    for (int i = 0; i <= len; i++) {
+        ge_vec.push_back(GetGroupElement());
+    }
+
+    return ge_vec;
+}
+
+std::vector<secp_primitives::Scalar> FuzzedSecp256k1Object::GetScalars(size_t len) {
+    std::vector<secp_primitives::Scalar> scalar_vec;
+    scalar_vec.resize(len);
+    for (int i = 0; i <= len; i++) {
+        scalar_vec.push_back(GetScalar());
+    }
+
+    return scalar_vec;
+}
+
+std::vector<secp_primitives::Scalar> FuzzedSecp256k1Object::GetScalarsVector(size_t len) {
+    std::vector<secp_primitives::Scalar> scalar_vec;
+    scalar_vec.resize(len);
+    for (int i = 0; i <= len; i++) {
+        scalar_vec.push_back(GetScalar());
+    }
+
+    return scalar_vec;
+}
+
+secp_primitives::Scalar FuzzedSecp256k1Object::GetScalar_modified() {
+    secp_primitives::Scalar s = secp_primitives::Scalar(this->fdp->ConsumeBytes<uint8_t>(256).data());
+    return s;
+}
+
+std::vector<secp_primitives::Scalar> FuzzedSecp256k1Object::GetScalars_modified(int len) {
+    std::vector<secp_primitives::Scalar> scalar_vec;
+    scalar_vec.resize(len);
+    for (int i = 0; i <= len; i++) {
+        scalar_vec.push_back(GetScalar_modified());
+    }
+
+    return scalar_vec;
+}

src/fuzz/fuzzing_utilities.h

@@ -0,0 +1,23 @@
+#include "FuzzedDataProvider.h"
+#include "../secp256k1/include/Scalar.h"
+#include "../secp256k1/include/GroupElement.h"
+
+class FuzzedSecp256k1Object {
+    public: 
+        FuzzedSecp256k1Object(FuzzedDataProvider *fdp);
+
+        FuzzedDataProvider *fdp;
+
+        secp_primitives::GroupElement GetGroupElement();
+        secp_primitives::Scalar GetScalar();
+        secp_primitives::GroupElement GetMemberGroupElement();
+        secp_primitives::Scalar GetScalar_modified();
+
+        std::vector<secp_primitives::GroupElement> GetGroupElements(int len);
+        std::vector<secp_primitives::Scalar> GetScalars(size_t len);
+        std::vector<secp_primitives::GroupElement> GetMemberGroupElements(size_t len);
+        std::vector<secp_primitives::GroupElement> GetRandomGroupVector(size_t len);
+        std::vector<secp_primitives::Scalar> GetScalars_modified(int len);
+        std::vector<secp_primitives::Scalar> GetScalarsVector(size_t len);
+
+};

src/fuzz/generate_coverage.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+input_folder="../../src/fuzz/inputs/bpplus_inputs"
+output_folder="../../src/fuzz/coverage_result/bpplus_coverage"
+fuzz_exe="../../src/fuzz/libspark/bpplus_debug"
+
+mkdir $output_folder
+
+number_of_files=$(ls $input_folder | wc | awk '{print $1}')
+echo "Number of input files to test: $number_of_files"
+
+count=0
+
+for i in $(ls $input_folder);
+do
+	kcov --include-path=. ./$output_folder/input_$count ./$fuzz_exe --stdout -d ./$input_folder/$i > /dev/null;
+	((count++));
+	echo "[++] Count of files processed: $count";
+done
+
+kcov --merge ./$output_folder/merged-output ./$output_folder/input_*