m4/ax_lib_nettle.m4

   1 # ===========================================================================
   2 #       http://www.gnu.org/software/autoconf-archive/ax_lib_nettle.html
   3 # ===========================================================================
   4 #
   5 # SYNOPSIS
   6 #
   7 #   AX_LIB_NETTLE([yes|no|auto])
   8 #
   9 # DESCRIPTION
  10 #
  11 #   Searches for the 'nettle' library with the --with... option.
  12 #
  13 #   If found, define HAVE_NETTLE and macro NETTLE_LIBS. Also defines
  14 #   NETTLE_WITH_<algo> for the algorithms found available. Possible
  15 #   algorithms: AES ARCTWO BLOWFISH CAST128 DES DES3 SERPENT TWOFISH MD2 MD4
  16 #   MD5 SHA1 SHA256.
  17 #
  18 #   The argument is used if no --with...-nettle option is set. Value "yes"
  19 #   requires the configuration by default. Value "no" does not require it by
  20 #   default. Value "auto" configures the library only if available.
  21 #
  22 #   See also AX_LIB_BEECRYPT, AX_LIB_CRYPTO, and AX_LIB_GCRYPT.
  23 #
  24 # LICENSE
  25 #
  26 #   Copyright (c) 2009 Fabien Coelho <autoconf.archive@coelho.net>
  27 #
  28 #   Copying and distribution of this file, with or without modification, are
  29 #   permitted in any medium without royalty provided the copyright notice
  30 #   and this notice are preserved. This file is offered as-is, without any
  31 #   warranty.
  32
  33 #serial 7
  34
  35 # AX_CHECK_NETTLE_ALGO([name],[function])
  36 AC_DEFUN([AX_CHECK_NETTLE_ALGO],[
  37   AC_CHECK_LIB([nettle], [nettle_$2],
  38     AC_DEFINE([NETTLE_WITH_$1],[1],[Algorithm $1 in nettle library]))
  39 ])
  40
  41 # AX_LIB_NETTLE([yes|no|auto])
  42 AC_DEFUN([AX_LIB_NETTLE],[
  43   AC_MSG_CHECKING([whether nettle is enabled])
  44   AC_ARG_WITH([nettle],[  --with-nettle         require nettle library
  45   --without-nettle      disable nettle library],[
  46     AC_MSG_RESULT([$withval])
  47     ax_with_nettle=$withval
  48   ],[
  49     AC_MSG_RESULT([$1])
  50     ax_with_nettle=$1
  51   ])
  52   if test "$ax_with_nettle" = "yes" -o "$ax_with_nettle" = "auto" ; then
  53     AC_CHECK_HEADERS([nettle/nettle-meta.h],[
  54       AC_CHECK_LIB([nettle],[nettle_base64_encode_final],[
  55         AC_DEFINE([HAVE_NETTLE],[1],[Nettle library is available])
  56         HAVE_NETTLE=1
  57         AC_SUBST([NETTLE_LIBS],[-lnettle])
  58         # ciphers
  59         AX_CHECK_NETTLE_ALGO([AES],[aes_encrypt])
  60         AX_CHECK_NETTLE_ALGO([ARCTWO],[arctwo_encrypt])
  61         AX_CHECK_NETTLE_ALGO([BLOWFISH],[blowfish_encrypt])
  62         AX_CHECK_NETTLE_ALGO([CAST128],[cast128_encrypt])
  63         AX_CHECK_NETTLE_ALGO([DES],[des_encrypt])
  64         AX_CHECK_NETTLE_ALGO([DES3],[des3_encrypt])
  65         AX_CHECK_NETTLE_ALGO([SERPENT],[serpent_encrypt])
  66         AX_CHECK_NETTLE_ALGO([TWOFISH],[twofish_encrypt])
  67         # digests
  68         AX_CHECK_NETTLE_ALGO([MD2],[md2_digest])
  69         AX_CHECK_NETTLE_ALGO([MD4],[md4_digest])
  70         AX_CHECK_NETTLE_ALGO([MD5],[md5_digest])
  71         AX_CHECK_NETTLE_ALGO([SHA1],[sha1_digest])
  72         AX_CHECK_NETTLE_ALGO([SHA256],[sha256_digest])
  73       ])
  74     ])
  75     # complain only if explicitely required
  76     if test "$ax_with_nettle" = "yes" -a "x$HAVE_NETTLE" = "x" ; then
  77         AC_MSG_ERROR([cannot configure required nettle library])
  78     fi
  79   fi
  80 ])