Configure installation of system libraries

chapter04/ex07_pack_nsis_standalone/CMakeLists.txt

@@ -15,16 +15,31 @@ if(NOT PROJECT_IS_TOP_LEVEL)
   message(FATAL_ERROR "The chapter-4, ex07_pack project is intended to be a standalone, top-level project. Do not include this directory.")
 endif()
 
+# Search the package OpenSSL and its component SSL, configuration fails if not found
+# this is used by the executable target
+find_package(OpenSSL REQUIRED COMPONENTS SSL)
+
 add_subdirectory(executable)
 add_subdirectory(library)
 
-include(InstallRequiredSystemLibraries)
+
+
+
+if(WIN32)
+  # if it is a debug build, we want to install debug libraries with the InstallRequiredSystemLibraries module
+  if(CMAKE_BUILD_TYPE STREQUAL "Debug")
+    set(CMAKE_INSTALL_DEBUG_LIBRARIES TRUE)
+  endif()
+  # this includes compiler provided runtime libraries on windows
+  include(InstallRequiredSystemLibraries)
+endif()
+
+# this includes the runtime directories of the executable and the library
 install(TARGETS ch4_ex07_executable
         RUNTIME_DEPENDENCIES
         PRE_EXCLUDE_REGEXES "api-ms-.*" "ext-ms-.*"
         POST_EXCLUDE_REGEXES ".*system32/.*\\.dll"
-        DIRECTORIES "${RUNTIME_DIRS}")
-
+        )
 
 # We will not explicitly specify project name and version here and 
 # let CPack to get project name and version from the project()
@@ -35,6 +50,5 @@ set(CPACK_GENERATOR "NSIS")
 set(CPACK_THREADS 0) 
 # The DEB generator requires CPACK_DEBIAN_PACKAGE_MAINTAINER
 # value to be set.
-set(CPACK_DEBIAN_PACKAGE_MAINTAINER "CBP Authors")
 # Enable packaging support for the project
 include(CPack)

chapter04/ex07_pack_nsis_standalone/executable/CMakeLists.txt

@@ -18,6 +18,7 @@ add_executable(ch4_ex07_executable src/main.cpp)
 target_compile_features(ch4_ex07_executable PRIVATE cxx_std_11)
 
 # Link executable target to library target
-target_link_libraries(ch4_ex07_executable PRIVATE ch4_ex07_library)
+target_link_libraries(ch4_ex07_executable PRIVATE ch4_ex07_library OpenSSL::SSL)
+
 
 install(TARGETS ch4_ex07_executable)

chapter04/ex07_pack_nsis_standalone/executable/src/main.cpp

@@ -8,7 +8,57 @@
 
 #include <chapter4/ex07/lib.hpp>
 
-int main(void) {
+#include <iomanip>
+#include <iostream>
+#include <openssl/evp.h>
+#include <openssl/sha.h>
+#include <sstream>
+#include <string>
+
+std::string sha256(const std::string &str) {
+  unsigned char hash[SHA256_DIGEST_LENGTH];
+  EVP_MD_CTX *mdctx;
+
+  if (!(mdctx = EVP_MD_CTX_new())) {
+    // Handle error
+    return "";
+  }
+
+  if (1 != EVP_DigestInit_ex(mdctx, EVP_sha256(), NULL)) {
+    // Handle error
+    EVP_MD_CTX_free(mdctx);
+    return "";
+  }
+
+  if (1 != EVP_DigestUpdate(mdctx, str.c_str(), str.size())) {
+    // Handle error
+    EVP_MD_CTX_free(mdctx);
+    return "";
+  }
+
+  unsigned int hash_len;
+  if (1 != EVP_DigestFinal_ex(mdctx, hash, &hash_len)) {
+    // Handle error
+    EVP_MD_CTX_free(mdctx);
+    return "";
+  }
+
+  EVP_MD_CTX_free(mdctx);
+
+  std::stringstream ss;
+  for (int i = 0; i < SHA256_DIGEST_LENGTH; i++) {
+    ss << std::hex << std::setw(2) << std::setfill('0') << (int)hash[i];
+  }
+
+  return ss.str();
+}
+
+int main(int, char **) {
   chapter4::ex07::greeter g;
   g.greet();
-}
+
+  const std::string message{"CMake is awesome!"};
+
+  std::cout << "The sha256 hash of the message '" << message << "' is:\n";
+  std::cout << "\t" << sha256(message) << "\n";
+}