cmake: Detect OpenSSL X25519 support

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

ConfigureChecks.cmake

@@ -150,6 +150,10 @@ if (OPENSSL_FOUND)
     set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARY})
     check_symbol_exists(EVP_PKEY_ED25519 "openssl/evp.h" HAVE_OPENSSL_ED25519)
 
+    set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})
+    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARY})
+    check_symbol_exists(EVP_PKEY_X25519 "openssl/evp.h" HAVE_OPENSSL_X25519)
+
     unset(CMAKE_REQUIRED_INCLUDES)
     unset(CMAKE_REQUIRED_LIBRARIES)
 endif()

config.h.cmake

@@ -100,6 +100,9 @@
 /* Define to 1 if you have OpenSSL with Ed25519 support */
 #cmakedefine HAVE_OPENSSL_ED25519 1
 
+/* Define to 1 if you have OpenSSL with X25519 support */
+#cmakedefine HAVE_OPENSSL_X25519 1
+
 /*************************** FUNCTIONS ***************************/
 
 /* Define to 1 if you have the `EVP_aes128_ctr' function. */