1 # gl-openssl.m4 serial 5
2 dnl Copyright (C) 2013-2020 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 AC_DEFUN([gl_SET_CRYPTO_CHECK_DEFAULT],
9 m4_define([gl_CRYPTO_CHECK_DEFAULT], [$1])
11 gl_SET_CRYPTO_CHECK_DEFAULT([no])
13 AC_DEFUN([gl_CRYPTO_CHECK],
15 dnl gnulib users set this before gl_INIT with gl_SET_CRYPTO_CHECK_DEFAULT()
16 m4_divert_once([DEFAULTS], [with_openssl_default='gl_CRYPTO_CHECK_DEFAULT'])
18 dnl Only clear once, so crypto routines can be checked for individually
19 m4_divert_once([DEFAULTS], [LIB_CRYPTO=])
21 AC_ARG_WITH([openssl],
22 [AS_HELP_STRING([--with-openssl],
23 [use libcrypto hash routines. Valid ARGs are:
25 'auto' => use if any version available,
26 'auto-gpl-compat' => use if gpl compatible version available,
27 'optional' => use if available and warn if not available;
28 default is ']gl_CRYPTO_CHECK_DEFAULT['.
29 Note also --with-linux-crypto, which will enable
30 use of kernel crypto routines, which have precedence])],
32 [with_openssl=$with_openssl_default])
34 AC_SUBST([LIB_CRYPTO])
35 if test "x$with_openssl" != xno; then
36 if test "x$with_openssl" = xauto-gpl-compat; then
37 AC_CACHE_CHECK([whether openssl is GPL compatible],
38 [gl_cv_openssl_gpl_compat],
41 #include <openssl/opensslv.h>
42 #if OPENSSL_VERSION_MAJOR < 3
43 #error "openssl >= version 3 not found"
46 [gl_cv_openssl_gpl_compat=yes],
47 [gl_cv_openssl_gpl_compat=no])])
49 if test "x$with_openssl" != xauto-gpl-compat ||
50 test "x$gl_cv_openssl_gpl_compat" = xyes; then
51 AC_CHECK_LIB([crypto], [$1],
53 m4_if([$1], [MD5], [openssl/md5.h], [openssl/sha.h]),
55 AC_DEFINE([HAVE_OPENSSL_$1], [1],
56 [Define to 1 if libcrypto is used for $1.])])])
58 if test "x$LIB_CRYPTO" = x; then
59 if test "x$with_openssl" = xyes; then
60 AC_MSG_ERROR([openssl development library not found for $1])
61 elif test "x$with_openssl" = xoptional; then
62 AC_MSG_WARN([openssl development library not found for $1])