AC_DEFUN([ACX_OPENSSL_GOST],[
	AC_MSG_CHECKING(for OpenSSL GOST support)

	tmp_CPPFLAGS=$CPPFLAGS
	tmp_LIBS=$LIBS

	CPPFLAGS="$CPPFLAGS $CRYPTO_INCLUDES"
	LIBS="$CRYPTO_LIBS $LIBS"

	AC_LANG_PUSH([C])
	AC_RUN_IFELSE([
		AC_LANG_SOURCE([[
			#include <openssl/engine.h>
			#include <openssl/crypto.h>
			#include <openssl/opensslv.h>
			int main()
			{
				ENGINE* eg;
				const EVP_MD* EVP_GOST_34_11;

				/* Initialise OpenSSL */
				OpenSSL_add_all_algorithms();

				/* Load engines */
			#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
				ENGINE_load_builtin_engines();
			#else
				OPENSSL_init_crypto(OPENSSL_INIT_ENGINE_ALL_BUILTIN | OPENSSL_INIT_LOAD_CONFIG, NULL);
			#endif

				/* Initialise the GOST engine */
				eg = ENGINE_by_id("gost");
				if (eg == NULL)
					return 1;
				if (ENGINE_init(eg) <= 0)
					return 1;

				/* better than digest_gost */
				EVP_GOST_34_11 = ENGINE_get_digest(eg, NID_id_GostR3411_94);
				if (EVP_GOST_34_11 == NULL)
					return 1;

				/* from the openssl.cnf */
				if (ENGINE_register_pkey_asn1_meths(eg) <= 0)
					return 1;
				if (ENGINE_ctrl_cmd_string(eg,
				    "CRYPT_PARAMS",
				    "id-Gost28147-89-CryptoPro-A-ParamSet",
				    0) <= 0)
					return 1;

				return 0;
			}
		]])
	],[
		AC_MSG_RESULT([Found GOST engine])
	],[
		AC_MSG_RESULT([Cannot find GOST engine])
		AC_MSG_ERROR([OpenSSL library has no GOST support])
	],[])
	AC_LANG_POP([C])

	CPPFLAGS=$tmp_CPPFLAGS
	LIBS=$tmp_LIBS
])