initial version of SQIsign

Co-authored-by: Jorge Chavez-Saab <jorgechavezsaab@gmail.com>
Co-authored-by: Maria Corte-Real Santos <36373796+mariascrs@users.noreply.github.com>
Co-authored-by: Luca De Feo <github@defeo.lu>
Co-authored-by: Jonathan Komada Eriksen <jonathan.eriksen97@gmail.com>
Co-authored-by: Basil Hess <bhe@zurich.ibm.com>
Co-authored-by: Antonin Leroux <18654258+tonioecto@users.noreply.github.com>
Co-authored-by: Patrick Longa <plonga@microsoft.com>
Co-authored-by: Lorenz Panny <lorenz@yx7.cc>
Co-authored-by: Francisco Rodríguez-Henríquez <francisco.rodriguez@tii.ae>
Co-authored-by: Sina Schaeffler <108983332+syndrakon@users.noreply.github.com>
Co-authored-by: Benjamin Wesolowski <19474926+Calodeon@users.noreply.github.com>

CMakeLists.txt

@@ -0,0 +1,47 @@
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.5)
+project(SQIsign VERSION 1.0 LANGUAGES C ASM)
+
+set(SQISIGN_SO_VERSION "0")
+set(CMAKE_C_STANDARD 99)
+
+include(CTest)
+
+option(ENABLE_STRICT "Build with strict compile options." OFF)
+option(ENABLE_TESTS  "Enable compilation of tests." ON)
+option(ENABLE_CT_TESTING  "Enable compilation for constant time testing." OFF)
+option(ENABLE_GMP_BUILD "Download and build external version of GMP" OFF)
+option(ENABLE_DOC_TARGET "Enable building API documentation using doxygen" OFF)
+
+if (NOT DEFINED SQISIGN_BUILD_TYPE)
+	SET(SQISIGN_BUILD_TYPE "ref")
+endif()
+
+if(SQISIGN_BUILD_TYPE STREQUAL "broadwell")
+	SET(SVARIANT_S "lvl1")
+else()
+	SET(SVARIANT_S "lvl1;lvl3;lvl5")
+endif()
+
+include(.cmake/flags.cmake)
+include(.cmake/sanitizers.cmake)
+include(.cmake/target.cmake)
+if(ENABLE_DOC_TARGET)
+	include(.cmake/target_docs.cmake)
+endif()
+include(.cmake/gmpconfig.cmake)
+
+
+set(SELECT_IMPL_TYPE ${PROJECT_SOURCE_DIR}/.cmake/impl_type.cmake)
+set(SELECT_SQISIGN_VARIANT ${PROJECT_SOURCE_DIR}/.cmake/sqisign_variant.cmake)
+
+set(INC_PUBLIC ${PROJECT_SOURCE_DIR}/include)
+
+add_subdirectory(src)
+add_subdirectory(apps)
+
+if(ENABLE_TESTS)
+	enable_testing()
+	add_subdirectory(test)
+endif()