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+# af_alg.m4 serial 6
+dnl Copyright 2018-2022 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.
+
+dnl From Matteo Croce.
+
+AC_DEFUN_ONCE([gl_AF_ALG],
+[
+ AC_REQUIRE([gl_SYS_SOCKET_H])
+ AC_REQUIRE([AC_C_INLINE])
+
+ dnl Check whether linux/if_alg.h has needed features.
+ AC_CACHE_CHECK([whether linux/if_alg.h has struct sockaddr_alg.],
+ [gl_cv_header_linux_if_alg_salg],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM([[#include <sys/socket.h>
+ #include <linux/if_alg.h>
+ struct sockaddr_alg salg = {
+ .salg_family = AF_ALG,
+ .salg_type = "hash",
+ .salg_name = "sha1",
+ };]])],
+ [gl_cv_header_linux_if_alg_salg=yes],
+ [gl_cv_header_linux_if_alg_salg=no])])
+ if test "$gl_cv_header_linux_if_alg_salg" = yes; then
+ AC_DEFINE([HAVE_LINUX_IF_ALG_H], [1],
+ [Define to 1 if you have 'struct sockaddr_alg' defined.])
+ fi
+
+ dnl The default is to not use AF_ALG if available,
+ dnl as it's system dependent as to whether the kernel
+ dnl routines are faster than libcrypto for example.
+ use_af_alg=no
+ AC_ARG_WITH([linux-crypto],
+ [AS_HELP_STRING([[--with-linux-crypto]],
+ [use Linux kernel cryptographic API (if available) for the hash functions
+ MD5, SHA-1, SHA-224, SHA-256, SHA-384, SHA-512 on files])],
+ [use_af_alg=$withval],
+ [use_af_alg=no])
+ dnl We cannot use it if it is not available.
+ if test "$gl_cv_header_linux_if_alg_salg" != yes; then
+ if test "$use_af_alg" != no; then
+ AC_MSG_WARN([Linux kernel cryptographic API not found])
+ fi
+ use_af_alg=no
+ fi
+
+ if test "$use_af_alg" != no; then
+ USE_AF_ALG=1
+ else
+ USE_AF_ALG=0
+ fi
+ AC_DEFINE_UNQUOTED([USE_LINUX_CRYPTO_API], [$USE_AF_ALG],
+ [Define to 1 if you want to use the Linux kernel cryptographic API.])
+])