3 dnl Copyright (C) 2013-2024 Free Software Foundation, Inc.
4 dnl This file is free software; the Free Software Foundation
5 dnl gives unlimited permission to copy and/or distribute it,
6 dnl with or without modifications, as long as this notice is preserved.
8 AC_DEFUN([gl_SET_CRYPTO_CHECK_DEFAULT],
10 m4_define([gl_CRYPTO_CHECK_DEFAULT], [$1])
12 gl_SET_CRYPTO_CHECK_DEFAULT([no])
14 AC_DEFUN([gl_CRYPTO_CHECK],
16 dnl gnulib users set this before gl_INIT with gl_SET_CRYPTO_CHECK_DEFAULT()
17 m4_divert_once([DEFAULTS], [with_openssl_default='gl_CRYPTO_CHECK_DEFAULT'])
19 dnl Only clear once, so crypto routines can be checked for individually
20 m4_divert_once([DEFAULTS], [LIB_CRYPTO=])
22 AC_ARG_WITH([openssl],
23 [[ --with-openssl[=ARG] use libcrypto hash routines for the hash functions
24 MD5, SHA-1, SHA-224, SHA-256, SHA-384, SHA-512.
28 'auto' => use if any version available,
29 'auto-gpl-compat' => use if GPL compatible version
31 'optional' => use if available
32 and warn if not available;
33 Default is ']gl_CRYPTO_CHECK_DEFAULT['.]m4_ifdef([gl_AF_ALG], [
34 Note also --with-linux-crypto, which will enable the
35 use of Linux kernel crypto routines (if available),
36 which has precedence for files.])],
38 [with_openssl=$with_openssl_default])
40 AC_SUBST([LIB_CRYPTO])
41 if test "x$with_openssl" != xno; then
42 if test "x$with_openssl" = xauto-gpl-compat; then
43 dnl OpenSSL versions < 3 are under the OpenSSL license, which is not
45 dnl See <https://www.gnu.org/licenses/license-list.en.html#OpenSSL>.
46 AC_CACHE_CHECK([whether openssl is GPL compatible],
47 [gl_cv_openssl_gpl_compat],
50 #include <openssl/opensslv.h>
51 #if OPENSSL_VERSION_MAJOR < 3
52 #error "openssl >= version 3 not found"
55 [gl_cv_openssl_gpl_compat=yes],
56 [gl_cv_openssl_gpl_compat=no])])
58 if test "x$with_openssl" != xauto-gpl-compat ||
59 test "x$gl_cv_openssl_gpl_compat" = xyes; then
60 AC_CHECK_LIB([crypto], [$1],
62 m4_if([$1], [MD5], [openssl/md5.h], [openssl/sha.h]),
64 AC_DEFINE([HAVE_OPENSSL_$1], [1],
65 [Define to 1 if libcrypto is used for $1.])])])
67 if test "x$LIB_CRYPTO" = x; then
68 message='openssl development library not found for $1.
69 If you want to install it, first find the pre-built package name:
70 - On Debian and Debian-based systems: libssl-dev,
71 - On Red Hat distributions: openssl-devel.
72 - Other: https://repology.org/project/openssl/versions'
73 if test "x$with_openssl" = xyes; then
74 AC_MSG_ERROR([$message])
75 elif test "x$with_openssl" = xoptional; then
76 AC_MSG_WARN([$message])