FindOpenSSL: Provide imported targets OpenSSL::{SSL,Crypto}

Modules/FindOpenSSL.cmake

@@ -4,6 +4,16 @@
 #
 # Find the OpenSSL encryption library.
 #
+# Imported Targets
+# ^^^^^^^^^^^^^^^^
+#
+# This module defines the following :prop_tgt:`IMPORTED` targets:
+#
+# ``OpenSSL::SSL``
+#   The OpenSSL ``ssl`` library, if found.
+# ``OpenSSL::Crypto``
+#   The OpenSSL ``crypto`` library, if found.
+#
 # Result Variables
 # ^^^^^^^^^^^^^^^^
 #
@@ -341,3 +351,66 @@ else ()
 endif ()
 
 mark_as_advanced(OPENSSL_INCLUDE_DIR OPENSSL_LIBRARIES)
+
+if(OPENSSL_FOUND)
+  if(NOT TARGET OpenSSL::Crypto AND
+      (EXISTS "${OPENSSL_CRYPTO_LIBRARY}" OR
+        EXISTS "${LIB_EAY_LIBRARY_DEBUG}" OR
+        EXISTS "${LIB_EAY_LIBRARY_RELEASE}")
+      )
+    add_library(OpenSSL::Crypto UNKNOWN IMPORTED)
+    set_target_properties(OpenSSL::Crypto PROPERTIES
+      INTERFACE_INCLUDE_DIRECTORIES "${OPENSSL_INCLUDE_DIR}")
+    if(EXISTS "${OPENSSL_CRYPTO_LIBRARY}")
+      set_target_properties(OpenSSL::Crypto PROPERTIES
+        IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+        IMPORTED_LOCATION "${OPENSSL_CRYPTO_LIBRARY}")
+    endif()
+    if(EXISTS "${LIB_EAY_LIBRARY_DEBUG}")
+      set_property(TARGET OpenSSL::Crypto APPEND PROPERTY
+        IMPORTED_CONFIGURATIONS DEBUG)
+      set_target_properties(OpenSSL::Crypto PROPERTIES
+        IMPORTED_LINK_INTERFACE_LANGUAGES_DEBUG "C"
+        IMPORTED_LOCATION_DEBUG "${LIB_EAY_LIBRARY_DEBUG}")
+    endif()
+    if(EXISTS "${LIB_EAY_LIBRARY_RELEASE}")
+      set_property(TARGET OpenSSL::Crypto APPEND PROPERTY
+        IMPORTED_CONFIGURATIONS RELEASE)
+      set_target_properties(OpenSSL::Crypto PROPERTIES
+        IMPORTED_LINK_INTERFACE_LANGUAGES_RELEASE "C"
+        IMPORTED_LOCATION_RELEASE "${LIB_EAY_LIBRARY_RELEASE}")
+    endif()
+  endif()
+  if(NOT TARGET OpenSSL::SSL AND
+      (EXISTS "${OPENSSL_SSL_LIBRARY}" OR
+        EXISTS "${SSL_EAY_LIBRARY_DEBUG}" OR
+        EXISTS "${SSL_EAY_LIBRARY_RELEASE}")
+      )
+    add_library(OpenSSL::SSL UNKNOWN IMPORTED)
+    set_target_properties(OpenSSL::SSL PROPERTIES
+      INTERFACE_INCLUDE_DIRECTORIES "${OPENSSL_INCLUDE_DIR}")
+    if(EXISTS "${OPENSSL_SSL_LIBRARY}")
+      set_target_properties(OpenSSL::SSL PROPERTIES
+        IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+        IMPORTED_LOCATION "${OPENSSL_SSL_LIBRARY}")
+    endif()
+    if(EXISTS "${SSL_EAY_LIBRARY_DEBUG}")
+      set_property(TARGET OpenSSL::SSL APPEND PROPERTY
+        IMPORTED_CONFIGURATIONS DEBUG)
+      set_target_properties(OpenSSL::SSL PROPERTIES
+        IMPORTED_LINK_INTERFACE_LANGUAGES_DEBUG "C"
+        IMPORTED_LOCATION_DEBUG "${SSL_EAY_LIBRARY_DEBUG}")
+    endif()
+    if(EXISTS "${SSL_EAY_LIBRARY_RELEASE}")
+      set_property(TARGET OpenSSL::SSL APPEND PROPERTY
+        IMPORTED_CONFIGURATIONS RELEASE)
+      set_target_properties(OpenSSL::SSL PROPERTIES
+        IMPORTED_LINK_INTERFACE_LANGUAGES_RELEASE "C"
+        IMPORTED_LOCATION_RELEASE "${SSL_EAY_LIBRARY_RELEASE}")
+    endif()
+    if(TARGET OpenSSL::Crypto)
+      set_target_properties(OpenSSL::SSL PROPERTIES
+        INTERFACE_LINK_LIBRARIES OpenSSL::Crypto)
+    endif()
+  endif()
+endif()

Tests/CMakeLists.txt

@@ -1333,6 +1333,10 @@ ${CMake_BINARY_DIR}/bin/cmake -DDIR=dev -P ${CMake_SOURCE_DIR}/Utilities/Release
     add_subdirectory(FindJsonCpp)
   endif()
 
+  if(CMake_TEST_FindOpenSSL)
+    add_subdirectory(FindOpenSSL)
+  endif()
+
   # Matlab module
   if(CMake_TEST_FindMatlab)
     ADD_TEST_MACRO(FindMatlab.basic_checks      ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION>)

Tests/FindOpenSSL/CMakeLists.txt

@@ -0,0 +1,9 @@
+add_test(NAME FindOpenSSL.rand COMMAND ${CMAKE_CTEST_COMMAND}
+  --build-and-test
+  "${CMake_SOURCE_DIR}/Tests/FindOpenSSL/rand"
+  "${CMake_BINARY_DIR}/Tests/FindOpenSSL/rand"
+  ${build_generator_args}
+  --build-project FindOpenSSL_rand
+  --build-options ${build_options}
+  --test-command ${CMAKE_CTEST_COMMAND} -V
+  )

Tests/FindOpenSSL/rand/CMakeLists.txt

@@ -0,0 +1,14 @@
+cmake_minimum_required(VERSION 3.0)
+project(FindOpenSSL_rand CXX)
+include(CTest)
+
+find_package(OpenSSL REQUIRED)
+
+add_executable(tstopensslrand_tgt main.cc)
+target_link_libraries(tstopensslrand_tgt OpenSSL::SSL)
+add_test(NAME tstopensslrand_tgt COMMAND tstopensslrand_tgt)
+
+add_executable(tstopensslrand_var main.cc)
+target_link_libraries(tstopensslrand_var ${OPENSSL_LIBRARIES})
+target_include_directories(tstopensslrand_var PRIVATE ${OPENSSL_INCLUDE_DIR})
+add_test(NAME tstopensslrand_var COMMAND tstopensslrand_var)

Tests/FindOpenSSL/rand/main.cc

@@ -0,0 +1,22 @@
+#include <openssl/rand.h>
+
+int main()
+{
+  // return value
+  int retval = 1;
+
+  // bytes buffer
+  unsigned char buf[1024];
+
+  // random bytes
+  int rezval = RAND_bytes(buf, sizeof(buf)); /* 1 succes, 0 otherwise */
+
+  // check result
+  if(rezval == 1)
+  {
+    retval = 0;
+  }
+
+  // return code
+  return retval;
+}