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|
# gc_random.m4 serial 1
# Copyright (C) 2004 Simon Josefsson
#
# This file is free software, distributed under the terms of the GNU
# General Public License. As a special exception to the GNU General
# Public License, this file may be distributed as part of a program
# that contains a configuration script generated by Autoconf, under
# the same distribution terms as the rest of that program.
# Usage: GC_RANDOM
AC_DEFUN([GC_RANDOM],
[
AC_REQUIRE([AC_CANONICAL_TARGET])
# Devices with randomness.
# FIXME: Are these the best defaults?
case "${target}" in
*-openbsd*)
NAME_OF_RANDOM_DEVICE="/dev/srandom"
NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/prandom"
NAME_OF_NONCE_DEVICE="/dev/urandom"
;;
*-netbsd*)
NAME_OF_RANDOM_DEVICE="/dev/srandom"
NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/urandom"
NAME_OF_NONCE_DEVICE="/dev/urandom"
;;
*-solaris* | *-irix* | *-dec-osf* )
NAME_OF_RANDOM_DEVICE="/dev/random"
NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/random"
NAME_OF_NONCE_DEVICE="/dev/random"
;;
*)
NAME_OF_RANDOM_DEVICE="/dev/random"
NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/urandom"
NAME_OF_NONCE_DEVICE="/dev/urandom"
;;
esac
AC_MSG_CHECKING([device with (strong) random data...])
AC_ARG_ENABLE(random-device,
AC_HELP_STRING([--enable-random-device],
[device with (strong) randomness (for Nettle)]),
NAME_OF_RANDOM_DEVICE=$enableval)
AC_MSG_RESULT($NAME_OF_RANDOM_DEVICE)
AC_MSG_CHECKING([device with pseudo random data...])
AC_ARG_ENABLE(pseudo-random-device,
AC_HELP_STRING([--enable-pseudo-random-device],
[device with pseudo randomness (for Nettle)]),
NAME_OF_PSEUDO_RANDOM_DEVICE=$enableval)
AC_MSG_RESULT($NAME_OF_PSEUDO_RANDOM_DEVICE)
AC_MSG_CHECKING([device with unpredictable data for nonces...])
AC_ARG_ENABLE(nonce-device,
AC_HELP_STRING([--enable-nonce-device],
[device with unpredictable nonces (for Nettle)]),
NAME_OF_NONCE_DEVICE=$enableval)
AC_MSG_RESULT($NAME_OF_NONCE_DEVICE)
AC_CHECK_FILE($NAME_OF_RANDOM_DEVICE,, AC_MSG_ERROR([[
*** Device for (strong) random data $NAME_OF_RANDOM_DEVICE does not exist
]]))
AC_CHECK_FILE($NAME_OF_PSEUDO_RANDOM_DEVICE,, AC_MSG_ERROR([[
*** Device for pseudo-random data $NAME_OF_PSEUDO_RANDOM_DEVICE does not exist
]]))
AC_CHECK_FILE($NAME_OF_NONCE_DEVICE,, AC_MSG_ERROR([[
*** Device for unpredictable nonces $NAME_OF_NONCE_DEVICE does not exist
]]))
# FIXME: Open+read 42 bytes+close twice and compare data. Should differ.
AC_DEFINE_UNQUOTED(NAME_OF_RANDOM_DEVICE, "$NAME_OF_RANDOM_DEVICE",
[defined to the name of the (strong) random device])
AC_DEFINE_UNQUOTED(NAME_OF_PSEUDO_RANDOM_DEVICE,
"$NAME_OF_PSEUDO_RANDOM_DEVICE",
[defined to the name of the pseudo random device])
AC_DEFINE_UNQUOTED(NAME_OF_NONCE_DEVICE, "$NAME_OF_NONCE_DEVICE",
[defined to the name of the unpredictable nonce device])
])
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