cmake: Detect OpenSSL support for Ed25519

Signed-off-by: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>

ConfigureChecks.cmake

@@ -146,6 +146,10 @@ if (OPENSSL_FOUND)
 
     check_function_exists(OPENSSL_ia32cap_loc HAVE_OPENSSL_IA32CAP_LOC)
 
+    set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})
+    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARY})
+    check_symbol_exists(EVP_PKEY_ED25519 "openssl/evp.h" HAVE_OPENSSL_ED25519)
+
     unset(CMAKE_REQUIRED_INCLUDES)
     unset(CMAKE_REQUIRED_LIBRARIES)
 endif()

config.h.cmake

@@ -97,6 +97,9 @@
 /* Define to 1 if you have gl_flags as a glob_t sturct member */
 #cmakedefine HAVE_GLOB_GL_FLAGS_MEMBER 1
 
+/* Define to 1 if you have OpenSSL with Ed25519 support */
+#cmakedefine HAVE_OPENSSL_ED25519 1
+
 /*************************** FUNCTIONS ***************************/
 
 /* Define to 1 if you have the `EVP_aes128_ctr' function. */