| # af_alg.m4 serial 4 |
| dnl Copyright 2018-2020 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_HEADER_SYS_SOCKET]) |
| 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 "$gl_cv_header_linux_if_alg_salg" = yes; then |
| AC_DEFINE([HAVE_LINUX_IF_ALG_H], [1], |
| [Define to 1 if you have 'struct sockaddr_alg' defined.]) |
| fi |
| |
| dnl The default is to not use AF_ALG if available, |
| dnl as it's system dependent as to whether the kernel |
| dnl routines are faster than libcrypto for example. |
| use_af_alg=no |
| AC_ARG_WITH([linux-crypto], |
| [AS_HELP_STRING([[--with-linux-crypto]], |
| [use Linux kernel cryptographic API (if available)])], |
| [use_af_alg=$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.]) |
| ]) |
