kc3-lang/gnulib/m4/af_alg.m4

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• m4/af_alg.m4

• # af_alg.m4 serial 6
  dnl Copyright 2018-2023 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.])
  ])
  

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