Add fuzz testing using american fuzzy lop

Existing tests: block, transaction, signature, cold outputs,
cold transaction.

Data for these is in tests/data/fuzz.

A convenience shell script is in contrib/fuzz_testing/fuzz.sh, eg:

contrib/fuzz_testing/fuzz.sh signature

The fuzzer will run indefinitely, ^C to stop.

Fuzzing is currently supported for GCC only. I can't get CLANG
to build Monero here as it dies on some system headers, so if
someone wants to make it work on both, that'd be great.
In particular, the __AFL_LOOP construct should be made to work
so that a given run can fuzz multiple inputs, as the C++ load
time is substantial.

20 files changed, 710 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index 9344f387c..0f5ee5773 100644
--- a/Makefile
+++ b/Makefile
@@ -108,6 +108,10 @@ release-static-win32:
 	mkdir -p build/release
 	cd build/release && cmake -G "MSYS Makefiles" -D STATIC=ON -D ARCH="i686" -D BUILD_64=OFF -D CMAKE_BUILD_TYPE=Release -D BUILD_TAG="win-x32" -D CMAKE_TOOLCHAIN_FILE=../../cmake/32-bit-toolchain.cmake -D MSYS2_FOLDER=c:/msys32 ../.. && $(MAKE)
 
+fuzz:
+	mkdir -p build/fuzz
+	cd build/fuzz && cmake -D BUILD_TESTS=ON -D USE_LTO=OFF -D CMAKE_C_COMPILER=afl-gcc -D CMAKE_CXX_COMPILER=afl-g++ -D ARCH="x86-64" -D CMAKE_BUILD_TYPE=fuzz -D BUILD_TAG="linux-x64" ../.. && $(MAKE)
+
 clean:
 	@echo "WARNING: Back-up your wallet if it exists within ./build!" ; \
         read -r -p "This will destroy the build directory, continue (y/N)?: " CONTINUE; \
diff --git a/contrib/fuzz_testing/fuzz.sh b/contrib/fuzz_testing/fuzz.sh
new file mode 100755
index 000000000..35b74f7e4
--- /dev/null
+++ b/contrib/fuzz_testing/fuzz.sh
@@ -0,0 +1,21 @@
+#!/bin/sh
+
+AFLFUZZ=$(which afl-fuzz)
+if ! test -x "$AFLFUZZ"
+then
+  echo "afl-fuzz not found - install american-fuzzy-lop"
+  exit 1
+fi
+
+type="$1"
+if test -z "$type"
+then
+  echo "usage: $0 block|transaction|signature|cold-outputs|cold-transaction"
+  exit 1
+fi
+case "$type" in
+  block|transaction|signature|cold-outputs|cold-transaction) ;;
+  *) echo "usage: $0 block|transaction|signature|cold-outputs|cold-transaction"; exit 1 ;;
+esac
+
+afl-fuzz -i tests/data/fuzz/$type -m 150 -t 250 -o fuzz-out/$type build/fuzz/tests/fuzz/${type}_fuzz_tests
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index cb29b27a0..85763f8b5 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -77,6 +77,7 @@ file(COPY
   DESTINATION data)
 
 add_subdirectory(core_tests)
+add_subdirectory(fuzz)
 add_subdirectory(crypto)
 add_subdirectory(functional_tests)
 add_subdirectory(performance_tests)
@@ -114,6 +115,7 @@ set(enabled_tests
     hash
     performance_tests
     core_proxy
+    fuzz
     unit_tests)
 
 add_custom_target(tests DEPENDS enabled_tests)
diff --git a/tests/data/fuzz/block/BLOCK1 b/tests/data/fuzz/block/BLOCK1
new file mode 100644
index 000000000..1d681ac23
--- /dev/null
+++ b/tests/data/fuzz/block/BLOCK1
diff --git a/tests/data/fuzz/block/BLOCK2 b/tests/data/fuzz/block/BLOCK2
new file mode 100644
index 000000000..b9de418a9
--- /dev/null
+++ b/tests/data/fuzz/block/BLOCK2
diff --git a/tests/data/fuzz/cold-outputs/OUTPUTS1 b/tests/data/fuzz/cold-outputs/OUTPUTS1
new file mode 100644
index 000000000..f449f61ad
--- /dev/null
+++ b/tests/data/fuzz/cold-outputs/OUTPUTS1
diff --git a/tests/data/fuzz/cold-outputs/OUTPUTS2 b/tests/data/fuzz/cold-outputs/OUTPUTS2
new file mode 100644
index 000000000..907bcdb91
--- /dev/null
+++ b/tests/data/fuzz/cold-outputs/OUTPUTS2
diff --git a/tests/data/fuzz/cold-transaction/CTX1 b/tests/data/fuzz/cold-transaction/CTX1
new file mode 100644
index 000000000..0afecedbc
--- /dev/null
+++ b/tests/data/fuzz/cold-transaction/CTX1
diff --git a/tests/data/fuzz/signature/SIG1 b/tests/data/fuzz/signature/SIG1
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/tests/data/fuzz/signature/SIG1
diff --git a/tests/data/fuzz/signature/SIG2 b/tests/data/fuzz/signature/SIG2
new file mode 100644
index 000000000..f03e8a4de
--- /dev/null
+++ b/tests/data/fuzz/signature/SIG2
@@ -0,0 +1 @@
+SigV1WbMcLkLKXz3Su9iFUp9aYF5vSfpVetcytVWAgqhn3KNe1kidn7M2KfTRpuK8G1ba1w2u5mbyoWbkLPy2Gm97BM4W
\ No newline at end of file
diff --git a/tests/data/fuzz/transaction/TX1 b/tests/data/fuzz/transaction/TX1
new file mode 100644
index 000000000..706af6ace
--- /dev/null
+++ b/tests/data/fuzz/transaction/TX1
diff --git a/tests/data/fuzz/transaction/TX2 b/tests/data/fuzz/transaction/TX2
new file mode 100644
index 000000000..f751f97a2
--- /dev/null
+++ b/tests/data/fuzz/transaction/TX2
diff --git a/tests/fuzz/CMakeLists.txt b/tests/fuzz/CMakeLists.txt
new file mode 100644
index 000000000..853d46a12
--- /dev/null
+++ b/tests/fuzz/CMakeLists.txt
@@ -0,0 +1,91 @@
+# Copyright (c) 2014-2017, The Monero Project
+#
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without modification, are
+# permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice, this list of
+#    conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright notice, this list
+#    of conditions and the following disclaimer in the documentation and/or other
+#    materials provided with the distribution.
+#
+# 3. Neither the name of the copyright holder nor the names of its contributors may be
+#    used to endorse or promote products derived from this software without specific
+#    prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+# THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+# THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+add_executable(block_fuzz_tests block.cpp fuzzer.cpp)
+target_link_libraries(block_fuzz_tests
+  PRIVATE
+    cryptonote_core
+    p2p
+    epee
+    ${CMAKE_THREAD_LIBS_INIT}
+    ${EXTRA_LIBRARIES})
+set_property(TARGET block_fuzz_tests
+  PROPERTY
+    FOLDER "tests")
+
+add_executable(transaction_fuzz_tests transaction.cpp fuzzer.cpp)
+target_link_libraries(transaction_fuzz_tests
+  PRIVATE
+    cryptonote_core
+    p2p
+    epee
+    ${CMAKE_THREAD_LIBS_INIT}
+    ${EXTRA_LIBRARIES})
+set_property(TARGET transaction_fuzz_tests
+  PROPERTY
+    FOLDER "tests")
+
+add_executable(signature_fuzz_tests signature.cpp fuzzer.cpp)
+target_link_libraries(signature_fuzz_tests
+  PRIVATE
+    wallet
+    cryptonote_core
+    p2p
+    epee
+    ${CMAKE_THREAD_LIBS_INIT}
+    ${EXTRA_LIBRARIES})
+set_property(TARGET signature_fuzz_tests
+  PROPERTY
+    FOLDER "tests")
+
+add_executable(cold-outputs_fuzz_tests cold-outputs.cpp fuzzer.cpp)
+target_link_libraries(cold-outputs_fuzz_tests
+  PRIVATE
+    wallet
+    cryptonote_core
+    p2p
+    epee
+    ${CMAKE_THREAD_LIBS_INIT}
+    ${EXTRA_LIBRARIES})
+set_property(TARGET cold-outputs_fuzz_tests
+  PROPERTY
+    FOLDER "tests")
+
+add_executable(cold-transaction_fuzz_tests cold-transaction.cpp fuzzer.cpp)
+target_link_libraries(cold-transaction_fuzz_tests
+  PRIVATE
+    wallet
+    cryptonote_core
+    p2p
+    epee
+    ${CMAKE_THREAD_LIBS_INIT}
+    ${EXTRA_LIBRARIES})
+set_property(TARGET cold-transaction_fuzz_tests
+  PROPERTY
+    FOLDER "tests")
+
diff --git a/tests/fuzz/block.cpp b/tests/fuzz/block.cpp
new file mode 100644
index 000000000..099e8e3bd
--- /dev/null
+++ b/tests/fuzz/block.cpp
@@ -0,0 +1,67 @@
+// Copyright (c) 2017, The Monero Project
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+// 
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "include_base_utils.h"
+#include "common/command_line.h"
+#include "file_io_utils.h"
+#include "cryptonote_protocol/blobdatatype.h"
+#include "cryptonote_basic/cryptonote_basic.h"
+#include "cryptonote_basic/cryptonote_format_utils.h"
+#include "fuzzer.h"
+
+class BlockFuzzer: public Fuzzer
+{
+public:
+  virtual int run(const std::string &filename);
+
+private:
+};
+
+int BlockFuzzer::run(const std::string &filename)
+{
+  std::string s;
+
+  if (!epee::file_io_utils::load_file_to_string(filename, s))
+  {
+    std::cout << "Error: failed to load file " << filename << std::endl;
+    return 1;
+  }
+  cryptonote::block b = AUTO_VAL_INIT(b);
+  if(!parse_and_validate_block_from_blob(s, b))
+  {
+    std::cout << "Error: failed to parse block from file  " << filename << std::endl;
+    return 1;
+  }
+  return 0;
+}
+
+int main(int argc, const char **argv)
+{
+  BlockFuzzer fuzzer;
+  return run_fuzzer(argc, argv, fuzzer);
+}
diff --git a/tests/fuzz/cold-outputs.cpp b/tests/fuzz/cold-outputs.cpp
new file mode 100644
index 000000000..e585b4b13
--- /dev/null
+++ b/tests/fuzz/cold-outputs.cpp
@@ -0,0 +1,108 @@
+// Copyright (c) 2017, The Monero Project
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+// 
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "include_base_utils.h"
+#include "file_io_utils.h"
+#include "cryptonote_protocol/blobdatatype.h"
+#include "cryptonote_basic/cryptonote_basic.h"
+#include "cryptonote_basic/cryptonote_format_utils.h"
+#include "wallet/wallet2.h"
+#include "fuzzer.h"
+
+class ColdOutputsFuzzer: public Fuzzer
+{
+public:
+  ColdOutputsFuzzer(): wallet(true) {}
+  virtual int init();
+  virtual int run(const std::string &filename);
+
+private:
+  tools::wallet2 wallet;
+};
+
+int ColdOutputsFuzzer::init()
+{
+  static const char * const spendkey_hex = "0b4f47697ec99c3de6579304e5f25c68b07afbe55b71d99620bf6cbf4e45a80f";
+  crypto::secret_key spendkey;
+  epee::string_tools::hex_to_pod(spendkey_hex, spendkey);
+
+  try
+  {
+    boost::filesystem::remove("/tmp/cold-outputs-test.keys");
+    boost::filesystem::remove("/tmp/cold-outputs-test.address.txt");
+    boost::filesystem::remove("/tmp/cold-outputs-test");
+
+    wallet.init("");
+    wallet.generate("/tmp/cold-outputs-test", "", spendkey, true, false);
+
+    boost::filesystem::remove("/tmp/cold-outputs-test.keys");
+    boost::filesystem::remove("/tmp/cold-outputs-test.address.txt");
+    boost::filesystem::remove("/tmp/cold-outputs-test");
+  }
+  catch (const std::exception &e)
+  {
+    std::cerr << "Error on ColdOutputsFuzzer::init: " << e.what() << std::endl;
+    return 1;
+  }
+  return 0;
+}
+
+int ColdOutputsFuzzer::run(const std::string &filename)
+{
+  std::string s;
+
+  if (!epee::file_io_utils::load_file_to_string(filename, s))
+  {
+    std::cout << "Error: failed to load file " << filename << std::endl;
+    return 1;
+  }
+  s = std::string("\x01\x16serialization::archive") + s;
+  try
+  {
+    std::vector<tools::wallet2::transfer_details> outputs;
+    std::stringstream iss;
+    iss << s;
+    boost::archive::portable_binary_iarchive ar(iss);
+    ar >> outputs;
+    size_t n_outputs = wallet.import_outputs(outputs);
+    std::cout << boost::lexical_cast<std::string>(n_outputs) << " outputs imported" << std::endl;
+  }
+  catch (const std::exception &e)
+  {
+    std::cerr << "Failed to import outputs: " << e.what() << std::endl;
+    return 1;
+  }
+  return 0;
+}
+
+int main(int argc, const char **argv)
+{
+  ColdOutputsFuzzer fuzzer;
+  return run_fuzzer(argc, argv, fuzzer);
+}
+
diff --git a/tests/fuzz/cold-transaction.cpp b/tests/fuzz/cold-transaction.cpp
new file mode 100644
index 000000000..c35d604a8
--- /dev/null
+++ b/tests/fuzz/cold-transaction.cpp
@@ -0,0 +1,110 @@
+// Copyright (c) 2017, The Monero Project
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+// 
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "include_base_utils.h"
+#include "common/command_line.h"
+#include "file_io_utils.h"
+#include "cryptonote_protocol/blobdatatype.h"
+#include "cryptonote_basic/cryptonote_basic.h"
+#include "cryptonote_basic/cryptonote_format_utils.h"
+#include "wallet/wallet2.h"
+#include "fuzzer.h"
+
+class ColdTransactionFuzzer: public Fuzzer
+{
+public:
+  ColdTransactionFuzzer(): wallet(true) {}
+  virtual int init();
+  virtual int run(const std::string &filename);
+
+private:
+  tools::wallet2 wallet;
+};
+
+
+int ColdTransactionFuzzer::init()
+{
+  static const char * const spendkey_hex = "0b4f47697ec99c3de6579304e5f25c68b07afbe55b71d99620bf6cbf4e45a80f";
+  crypto::secret_key spendkey;
+  epee::string_tools::hex_to_pod(spendkey_hex, spendkey);
+
+  try
+  {
+    boost::filesystem::remove("/tmp/cold-transaction-test.keys");
+    boost::filesystem::remove("/tmp/cold-transaction-test.address.txt");
+    boost::filesystem::remove("/tmp/cold-transaction-test");
+
+    wallet.init("");
+    wallet.generate("/tmp/cold-transaction-test", "", spendkey, true, false);
+
+    boost::filesystem::remove("/tmp/cold-transaction-test.keys");
+    boost::filesystem::remove("/tmp/cold-transaction-test.address.txt");
+    boost::filesystem::remove("/tmp/cold-transaction-test");
+  }
+  catch (const std::exception &e)
+  {
+    std::cerr << "Error on ColdTransactionFuzzer::init: " << e.what() << std::endl;
+    return 1;
+  }
+  return 0;
+}
+
+int ColdTransactionFuzzer::run(const std::string &filename)
+{
+  std::string s;
+
+  if (!epee::file_io_utils::load_file_to_string(filename, s))
+  {
+    std::cout << "Error: failed to load file " << filename << std::endl;
+    return 1;
+  }
+  s = std::string("\x01\x16serialization::archive") + s;
+  try
+  {
+    tools::wallet2::unsigned_tx_set exported_txs;
+    std::stringstream iss;
+    iss << s;
+    boost::archive::portable_binary_iarchive ar(iss);
+    ar >> exported_txs;
+    std::vector<tools::wallet2::pending_tx> ptx;
+    bool success = wallet.sign_tx(exported_txs, "/tmp/cold-transaction-test-signed", ptx);
+    std::cout << (success ? "signed" : "error") << std::endl;
+  }
+  catch (const std::exception &e)
+  {
+    std::cerr << "Failed to sign transaction: " << e.what() << std::endl;
+    return 1;
+  }
+  return 0;
+}
+
+int main(int argc, const char **argv)
+{
+  ColdTransactionFuzzer fuzzer;
+  return run_fuzzer(argc, argv, fuzzer);
+}
diff --git a/tests/fuzz/fuzzer.cpp b/tests/fuzz/fuzzer.cpp
new file mode 100644
index 000000000..3edf8cd19
--- /dev/null
+++ b/tests/fuzz/fuzzer.cpp
@@ -0,0 +1,96 @@
+// Copyright (c) 2017, The Monero Project
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+// 
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <boost/program_options.hpp>
+#include "include_base_utils.h"
+#include "common/command_line.h"
+#include "fuzzer.h"
+
+#if (!defined(__clang__) || (__clang__ < 5))
+static int __AFL_LOOP(int)
+{
+  static int once = 0;
+  if (once)
+    return 0;
+  once = 1;
+  return 1;
+}
+#endif
+
+using namespace epee;
+using namespace boost::program_options;
+
+int run_fuzzer(int argc, const char **argv, Fuzzer &fuzzer)
+{
+  TRY_ENTRY();
+  string_tools::set_module_name_and_folder(argv[0]);
+
+  //set up logging options
+  mlog_configure(mlog_get_default_log_path("fuzztests.log"), true);
+  mlog_set_log("*:FATAL,logging:none");
+
+  options_description desc_options("Allowed options");
+  command_line::add_arg(desc_options, command_line::arg_help);
+
+  variables_map vm;
+  bool r = command_line::handle_error_helper(desc_options, [&]()
+  {
+    store(parse_command_line(argc, argv, desc_options), vm);
+    notify(vm);
+    return true;
+  });
+  if (!r)
+    return 1;
+
+  if (command_line::get_arg(vm, command_line::arg_help))
+  {
+    std::cout << desc_options << std::endl;
+    return 0;
+  }
+
+  if (argc < 2)
+  {
+    std::cout << desc_options << std::endl;
+    return 1;
+  }
+
+  int ret = fuzzer.init();
+  if (ret)
+    return ret;
+
+  const std::string filename = argv[1];
+  while (__AFL_LOOP(1000))
+  {
+    ret = fuzzer.run(filename);
+    if (ret)
+      return ret;
+  }
+
+  CATCH_ENTRY_L0("fuzzer_main", 1);
+  return 0;
+}
diff --git a/tests/fuzz/fuzzer.h b/tests/fuzz/fuzzer.h
new file mode 100644
index 000000000..a0a9c0173
--- /dev/null
+++ b/tests/fuzz/fuzzer.h
@@ -0,0 +1,38 @@
+// Copyright (c) 2017, The Monero Project
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+// 
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <string>
+
+class Fuzzer
+{
+public:
+  virtual int init() { return 0; }
+  virtual int run(const std::string &filename) = 0;
+};
+
+int run_fuzzer(int argc, const char **argv, Fuzzer &fuzzer);
diff --git a/tests/fuzz/signature.cpp b/tests/fuzz/signature.cpp
new file mode 100644
index 000000000..69d0ad25b
--- /dev/null
+++ b/tests/fuzz/signature.cpp
@@ -0,0 +1,105 @@
+// Copyright (c) 2017, The Monero Project
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+// 
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "include_base_utils.h"
+#include "common/command_line.h"
+#include "file_io_utils.h"
+#include "cryptonote_protocol/blobdatatype.h"
+#include "cryptonote_basic/cryptonote_basic.h"
+#include "cryptonote_basic/cryptonote_format_utils.h"
+#include "wallet/wallet2.h"
+#include "fuzzer.h"
+
+class SignatureFuzzer: public Fuzzer
+{
+public:
+  SignatureFuzzer(): Fuzzer(), wallet(true) {}
+  virtual int init();
+  virtual int run(const std::string &filename);
+
+private:
+  tools::wallet2 wallet;
+  cryptonote::account_public_address address;
+};
+
+int SignatureFuzzer::init()
+{
+  static const char * const spendkey_hex = "0b4f47697ec99c3de6579304e5f25c68b07afbe55b71d99620bf6cbf4e45a80f";
+  crypto::secret_key spendkey;
+  epee::string_tools::hex_to_pod(spendkey_hex, spendkey);
+
+  try
+  {
+    boost::filesystem::remove("/tmp/signature-test.keys");
+    boost::filesystem::remove("/tmp/signature-test.address.txt");
+    boost::filesystem::remove("/tmp/signature-test");
+
+    wallet.init("");
+    wallet.generate("/tmp/signature-test", "", spendkey, true, false);
+
+    boost::filesystem::remove("/tmp/signature-test.keys");
+    boost::filesystem::remove("/tmp/signature-test.address.txt");
+    boost::filesystem::remove("/tmp/signature-test");
+
+    bool has_payment_id;
+    crypto::hash8 new_payment_id;
+    if (!cryptonote::get_account_address_from_str_or_url(address, has_payment_id, new_payment_id, true, "9uVsvEryzpN8WH2t1WWhFFCG5tS8cBNdmJYNRuckLENFimfauV5pZKeS1P2CbxGkSDTUPHXWwiYE5ZGSXDAGbaZgDxobqDN"))
+    {
+      std::cerr << "failed to parse address" << std::endl;
+      return 1;
+    }
+  }
+  catch (const std::exception &e)
+  {
+    std::cerr << "Error on SignatureFuzzer::init: " << e.what() << std::endl;
+    return 1;
+  }
+  return 0;
+}
+
+int SignatureFuzzer::run(const std::string &filename)
+{
+  std::string s;
+
+  if (!epee::file_io_utils::load_file_to_string(filename, s))
+  {
+    std::cout << "Error: failed to load file " << filename << std::endl;
+    return 1;
+  }
+
+  bool valid = wallet.verify("test", address, s);
+  std::cout << "Signature " << (valid ? "valid" : "invalid") << std::endl;
+
+  return 0;
+}
+
+int main(int argc, const char **argv)
+{
+  SignatureFuzzer fuzzer;
+  return run_fuzzer(argc, argv, fuzzer);
+}
diff --git a/tests/fuzz/transaction.cpp b/tests/fuzz/transaction.cpp
new file mode 100644
index 000000000..21cd01bef
--- /dev/null
+++ b/tests/fuzz/transaction.cpp
@@ -0,0 +1,67 @@
+// Copyright (c) 2017, The Monero Project
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+// 
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "include_base_utils.h"
+#include "common/command_line.h"
+#include "file_io_utils.h"
+#include "cryptonote_protocol/blobdatatype.h"
+#include "cryptonote_basic/cryptonote_basic.h"
+#include "cryptonote_basic/cryptonote_format_utils.h"
+#include "fuzzer.h"
+
+class TransactionFuzzer: public Fuzzer
+{
+public:
+  virtual int run(const std::string &filename);
+
+private:
+};
+
+int TransactionFuzzer::run(const std::string &filename)
+{
+  std::string s;
+
+  if (!epee::file_io_utils::load_file_to_string(filename, s))
+  {
+    std::cout << "Error: failed to load file " << filename << std::endl;
+    return 1;
+  }
+  cryptonote::transaction tx = AUTO_VAL_INIT(tx);
+  if(!parse_and_validate_tx_from_blob(s, tx))
+  {
+    std::cout << "Error: failed to parse transaction from file  " << filename << std::endl;
+    return 1;
+  }
+  return 0;
+}
+
+int main(int argc, const char **argv)
+{
+  TransactionFuzzer fuzzer;
+  return run_fuzzer(argc, argv, fuzzer);
+}