add support for CMake

Note that the CMakeLists.txt file is not included in autotools dist package to
avoid any packaging confusion. `configure.ac` is still the primary
build-configuration information source. (Btw isn't there a way to build
CMakeLists.txt from autotools?)

.gitignore

@@ -23,3 +23,5 @@ NEWS
 src/.deps/
 src/.dirstamp
 src/*.o
+.idea
+cmake-build-debug

CMakeLists.txt

@@ -0,0 +1,91 @@
+cmake_minimum_required(VERSION 3.8)
+project(ccr)
+
+set(CMAKE_CXX_STANDARD 11)
+
+if (APPLE)
+    include_directories(/usr/local/opt/gmp/include /usr/local/opt/fftw/include)
+    link_directories(/usr/local/opt/gmp/lib /usr/local/opt/fftw/lib)
+    add_definitions(-DHAVE_READPASSPHRASE=1)
+
+    find_library(HAVE_CRYPTOPP cryptopp)
+    if(HAVE_CRYPTOPP)
+        add_definitions(-DHAVE_CRYPTOPP=1)
+        include_directories(/usr/local/opt/cryptopp/include)
+        link_directories(/usr/local/opt/cryptopp/lib)
+    else()
+        message(WARNING "install cryptopp by homebrew is better")
+    endif()
+
+elseif(UNIX)
+    include_directories(/usr/include)
+    link_directories(/usr/lib)
+
+    find_library(HAVE_BSDREADPASSPHRASE bsd)
+    if (HAVE_BSDREADPASSPHRASE)
+        add_definitions(-DHAVE_BSDREADPASSPHRASE=1)
+    else()
+        message(FATAL_ERROR "libbsd missing, you can install libbsd-dev package!")
+    endif()
+
+    find_library(HAVE_CRYPTOPP crypto++)
+    if(HAVE_CRYPTOPP)
+        add_definitions(-DHAVE_CRYPTOPP=1 -DCRYPTOPP_DIR_PLUS=1)
+    else()
+        message(WARNING "use crypto++ is better")
+    endif()
+
+endif (APPLE)
+
+add_definitions(-DPACKAGE_VERSION="1.8")
+
+add_executable(ccr
+        src/actions.cpp
+        src/algo_suite.cpp
+        src/algos_enc.cpp
+        src/algos_sig.cpp
+        src/base64.cpp
+        src/bvector.cpp
+        src/chacha.cpp
+        src/envelope.cpp
+        src/fft.cpp
+        src/fmtseq.cpp
+        src/generator.cpp
+        src/gf2m.cpp
+        src/hash.cpp
+        src/hashfile.cpp
+        src/iohelpers.cpp
+        src/ios.cpp
+        src/keyring.cpp
+        src/main.cpp
+        src/matrix.cpp
+        src/mce_qcmdpc.cpp
+        src/message.cpp
+        src/permutation.cpp
+        src/privfile.cpp
+        src/polynomial.cpp
+        src/sc.cpp
+        src/seclock.cpp
+        src/sencode.cpp
+        src/serialization.cpp
+        src/str_match.cpp
+        src/symkey.cpp
+        src/pwrng.cpp
+        src/xsynd.cpp)
+
+target_link_libraries(ccr fftw3 gmp)
+
+if (APPLE)
+elseif(UNIX)
+    if (HAVE_BSDREADPASSPHRASE)
+        target_link_libraries(ccr bsd)
+    endif()
+endif (APPLE)
+
+if (HAVE_CRYPTOPP)
+    if(CRYPTOPP_DIR_PLUS)
+        target_link_libraries(ccr crypto++)
+    else()
+        target_link_libraries(ccr cryptopp)
+    endif()
+endif ()