57 lines
2 KiB
Text
57 lines
2 KiB
Text
# af_alg.m4 serial 6
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dnl Copyright 2018-2023 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl From Matteo Croce.
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AC_DEFUN_ONCE([gl_AF_ALG],
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[
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AC_REQUIRE([gl_SYS_SOCKET_H])
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AC_REQUIRE([AC_C_INLINE])
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dnl Check whether linux/if_alg.h has needed features.
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AC_CACHE_CHECK([whether linux/if_alg.h has struct sockaddr_alg.],
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[gl_cv_header_linux_if_alg_salg],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([[#include <sys/socket.h>
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#include <linux/if_alg.h>
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struct sockaddr_alg salg = {
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.salg_family = AF_ALG,
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.salg_type = "hash",
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.salg_name = "sha1",
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};]])],
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[gl_cv_header_linux_if_alg_salg=yes],
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[gl_cv_header_linux_if_alg_salg=no])])
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if test "$gl_cv_header_linux_if_alg_salg" = yes; then
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AC_DEFINE([HAVE_LINUX_IF_ALG_H], [1],
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[Define to 1 if you have 'struct sockaddr_alg' defined.])
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fi
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dnl The default is to not use AF_ALG if available,
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dnl as it's system dependent as to whether the kernel
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dnl routines are faster than libcrypto for example.
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use_af_alg=no
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AC_ARG_WITH([linux-crypto],
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[AS_HELP_STRING([[--with-linux-crypto]],
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[use Linux kernel cryptographic API (if available) for the hash functions
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MD5, SHA-1, SHA-224, SHA-256, SHA-384, SHA-512 on files])],
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[use_af_alg=$withval],
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[use_af_alg=no])
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dnl We cannot use it if it is not available.
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if test "$gl_cv_header_linux_if_alg_salg" != yes; then
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if test "$use_af_alg" != no; then
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AC_MSG_WARN([Linux kernel cryptographic API not found])
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fi
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use_af_alg=no
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fi
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if test "$use_af_alg" != no; then
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USE_AF_ALG=1
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else
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USE_AF_ALG=0
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fi
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AC_DEFINE_UNQUOTED([USE_LINUX_CRYPTO_API], [$USE_AF_ALG],
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[Define to 1 if you want to use the Linux kernel cryptographic API.])
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])
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