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# gl-openssl.m4 serial 7
dnl Copyright (C) 2013-2024 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_SET_CRYPTO_CHECK_DEFAULT],
[
m4_define([gl_CRYPTO_CHECK_DEFAULT], [$1])
])
gl_SET_CRYPTO_CHECK_DEFAULT([no])
AC_DEFUN([gl_CRYPTO_CHECK],
[
dnl gnulib users set this before gl_INIT with gl_SET_CRYPTO_CHECK_DEFAULT()
m4_divert_once([DEFAULTS], [with_openssl_default='gl_CRYPTO_CHECK_DEFAULT'])
dnl Only clear once, so crypto routines can be checked for individually
m4_divert_once([DEFAULTS], [LIB_CRYPTO=])
AC_ARG_WITH([openssl],
[[ --with-openssl[=ARG] use libcrypto hash routines for the hash functions
MD5, SHA-1, SHA-224, SHA-256, SHA-384, SHA-512.
Valid ARGs are:
'yes',
'no',
'auto' => use if any version available,
'auto-gpl-compat' => use if GPL compatible version
available,
'optional' => use if available
and warn if not available;
Default is ']gl_CRYPTO_CHECK_DEFAULT['.]m4_ifdef([gl_AF_ALG], [
Note also --with-linux-crypto, which will enable the
use of Linux kernel crypto routines (if available),
which has precedence for files.])],
[],
[with_openssl=$with_openssl_default])
AC_SUBST([LIB_CRYPTO])
if test "x$with_openssl" != xno; then
if test "x$with_openssl" = xauto-gpl-compat; then
dnl OpenSSL versions < 3 are under the OpenSSL license, which is not
dnl GPL compatible.
dnl See <https://www.gnu.org/licenses/license-list.en.html#OpenSSL>.
AC_CACHE_CHECK([whether openssl is GPL compatible],
[gl_cv_openssl_gpl_compat],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[
#include <openssl/opensslv.h>
#if OPENSSL_VERSION_MAJOR < 3
#error "openssl >= version 3 not found"
#endif
]])],
[gl_cv_openssl_gpl_compat=yes],
[gl_cv_openssl_gpl_compat=no])])
fi
if test "x$with_openssl" != xauto-gpl-compat ||
test "x$gl_cv_openssl_gpl_compat" = xyes; then
AC_CHECK_LIB([crypto], [$1],
[AC_CHECK_HEADERS(
m4_if([$1], [MD5], [openssl/md5.h], [openssl/sha.h]),
[LIB_CRYPTO=-lcrypto
AC_DEFINE([HAVE_OPENSSL_$1], [1],
[Define to 1 if libcrypto is used for $1.])])])
fi
if test "x$LIB_CRYPTO" = x; then
message='openssl development library not found for $1.
If you want to install it, first find the pre-built package name:
- On Debian and Debian-based systems: libssl-dev,
- On Red Hat distributions: openssl-devel.
- Other: https://repology.org/project/openssl/versions'
if test "x$with_openssl" = xyes; then
AC_MSG_ERROR([$message])
elif test "x$with_openssl" = xoptional; then
AC_MSG_WARN([$message])
fi
fi
fi
])
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