Add (openssl-based) SHA-1 hashing.

CMakeLists.txt

@@ -60,6 +60,7 @@ find_package(PkgConfig)
 pkg_check_modules(FFMPEG REQUIRED libavutil libavcodec libavformat)
 pkg_check_modules(LIBEVENT REQUIRED libevent)
 pkg_check_modules(GLOG REQUIRED libglog)
+pkg_check_modules(OPENSSL REQUIRED libcrypto)
 
 # Check if ffmpeg support "stimeout".
 set(CMAKE_REQUIRED_INCLUDES ${FFMPEG_INCLUDES})

src/CMakeLists.txt

@@ -35,12 +35,14 @@ set(MOONFIRE_DEPS
     ${LIBEVENT_LIBRARIES}
     ${GFLAGS_LIBRARIES}
     ${GLOG_LIBRARIES}
+    ${OPENSSL_LIBRARIES}
     ${PROFILER_LIBRARIES}
     ${PROTOBUF_LIBRARIES}
     ${RE2_LIBRARIES})
 
 set(MOONFIRE_NVR_SRCS
     coding.cc
+    crypto.cc
     ffmpeg.cc
     filesystem.cc
     http.cc
@@ -61,7 +63,7 @@ install_programs(/bin FILES moonfire-nvr)
 include_directories(${GTest_INCLUDE_DIR})
 include_directories(${GMock_INCLUDE_DIR})
 
-foreach(test coding http moonfire-nvr recording string)
+foreach(test coding crypto http moonfire-nvr recording string)
   add_executable(${test}-test ${test}-test.cc testutil.cc)
   target_link_libraries(${test}-test GTest GMock moonfire-nvr-lib)
   add_test(NAME ${test}-test

src/crypto-test.cc

@@ -0,0 +1,67 @@
+// This file is part of Moonfire NVR, a security camera network video recorder.
+// Copyright (C) 2016 Scott Lamb <slamb@slamb.org>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// In addition, as a special exception, the copyright holders give
+// permission to link the code of portions of this program with the
+// OpenSSL library under certain conditions as described in each
+// individual source file, and distribute linked combinations including
+// the two.
+//
+// You must obey the GNU General Public License in all respects for all
+// of the code used other than OpenSSL. If you modify file(s) with this
+// exception, you may extend this exception to your version of the
+// file(s), but you are not obligated to do so. If you do not wish to do
+// so, delete this exception statement from your version. If you delete
+// this exception statement from all source files in the program, then
+// also delete it here.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+// crypto-test.cc: tests of the crypto.h interface.
+
+#include <gflags/gflags.h>
+#include <glog/logging.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include "crypto.h"
+#include "string.h"
+
+DECLARE_bool(alsologtostderr);
+
+namespace moonfire_nvr {
+namespace {
+
+TEST(DigestTest, Sha1) {
+  auto sha1 = Digest::SHA1();
+  EXPECT_EQ("da 39 a3 ee 5e 6b 4b 0d 32 55 bf ef 95 60 18 90 af d8 07 09",
+            ToHex(sha1->Finalize()));
+
+  sha1 = Digest::SHA1();
+  sha1->Update("hello");
+  sha1->Update(" world");
+  EXPECT_EQ("2a ae 6c 35 c9 4f cf b4 15 db e9 5f 40 8b 9c e9 1e e8 46 ed",
+            ToHex(sha1->Finalize()));
+}
+
+}  // namespace
+}  // namespace moonfire_nvr
+
+int main(int argc, char **argv) {
+  FLAGS_alsologtostderr = true;
+  google::ParseCommandLineFlags(&argc, &argv, true);
+  testing::InitGoogleTest(&argc, argv);
+  google::InitGoogleLogging(argv[0]);
+  return RUN_ALL_TESTS();
+}

src/crypto.cc

@@ -0,0 +1,61 @@
+// This file is part of Moonfire NVR, a security camera network video recorder.
+// Copyright (C) 2016 Scott Lamb <slamb@slamb.org>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// In addition, as a special exception, the copyright holders give
+// permission to link the code of portions of this program with the
+// OpenSSL library under certain conditions as described in each
+// individual source file, and distribute linked combinations including
+// the two.
+//
+// You must obey the GNU General Public License in all respects for all
+// of the code used other than OpenSSL. If you modify file(s) with this
+// exception, you may extend this exception to your version of the
+// file(s), but you are not obligated to do so. If you do not wish to do
+// so, delete this exception statement from your version. If you delete
+// this exception statement from all source files in the program, then
+// also delete it here.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+// crypto.cc: see crypto.h.
+
+#include "crypto.h"
+
+#include <glog/logging.h>
+
+namespace moonfire_nvr {
+
+std::unique_ptr<Digest> Digest::SHA1() {
+  std::unique_ptr<Digest> d(new Digest);
+  CHECK_EQ(1, EVP_DigestInit_ex(d->ctx_, EVP_sha1(), nullptr));
+  return d;
+}
+
+Digest::Digest() { ctx_ = CHECK_NOTNULL(EVP_MD_CTX_create()); }
+
+Digest::~Digest() { EVP_MD_CTX_destroy(ctx_); }
+
+void Digest::Update(re2::StringPiece data) {
+  CHECK_EQ(1, EVP_DigestUpdate(ctx_, data.data(), data.size()));
+}
+
+std::string Digest::Finalize() {
+  std::string out;
+  out.resize(EVP_MD_CTX_size(ctx_));
+  auto *p = reinterpret_cast<unsigned char *>(&out[0]);
+  CHECK_EQ(1, EVP_DigestFinal_ex(ctx_, p, nullptr));
+  return out;
+}
+
+}  // namespace moonfire_nvr

src/crypto.h

@@ -0,0 +1,63 @@
+// This file is part of Moonfire NVR, a security camera network video recorder.
+// Copyright (C) 2016 Scott Lamb <slamb@slamb.org>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// In addition, as a special exception, the copyright holders give
+// permission to link the code of portions of this program with the
+// OpenSSL library under certain conditions as described in each
+// individual source file, and distribute linked combinations including
+// the two.
+//
+// You must obey the GNU General Public License in all respects for all
+// of the code used other than OpenSSL. If you modify file(s) with this
+// exception, you may extend this exception to your version of the
+// file(s), but you are not obligated to do so. If you do not wish to do
+// so, delete this exception statement from your version. If you delete
+// this exception statement from all source files in the program, then
+// also delete it here.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+// crypto.h: cryptographic functions.
+
+#ifndef MOONFIRE_NVR_CRYPTO_H
+#define MOONFIRE_NVR_CRYPTO_H
+
+#include <memory>
+
+#include <openssl/evp.h>
+#include <re2/stringpiece.h>
+
+namespace moonfire_nvr {
+
+class Digest {
+ public:
+  static std::unique_ptr<Digest> SHA1();
+  ~Digest();
+
+  // PRE: Finalize() has not been called.
+  void Update(re2::StringPiece data);
+
+  // PRE: Finalize() has not been called.
+  std::string Finalize();
+
+ private:
+  Digest();
+  Digest(const Digest &) = delete;
+  void operator=(const Digest &) = delete;
+  EVP_MD_CTX *ctx_ = nullptr;
+};
+
+}  // namespace moonfire_nvr
+
+#endif  // MOONFIRE_NVR_CRYPTO_H