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# gc-random.m4 serial 6
dnl Copyright (C) 2005-2012 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.
AC_DEFUN([gl_GC_RANDOM],
[
# Devices with randomness.
# FIXME: Are these the best defaults?
AC_REQUIRE([AC_CANONICAL_HOST])dnl
case "$host_os" in
*openbsd* | *mirbsd*)
NAME_OF_RANDOM_DEVICE="/dev/srandom"
NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/prandom"
NAME_OF_NONCE_DEVICE="/dev/urandom"
;;
*netbsd*)
NAME_OF_RANDOM_DEVICE="/dev/srandom"
NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/urandom"
NAME_OF_NONCE_DEVICE="/dev/urandom"
;;
*solaris* | *irix* | *dec-osf* )
NAME_OF_RANDOM_DEVICE="/dev/random"
NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/random"
NAME_OF_NONCE_DEVICE="/dev/random"
;;
*)
NAME_OF_RANDOM_DEVICE="/dev/random"
NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/urandom"
NAME_OF_NONCE_DEVICE="/dev/urandom"
;;
esac
AC_MSG_CHECKING([device with (strong) random data...])
AC_ARG_ENABLE([random-device],
AS_HELP_STRING([--enable-random-device],
[device with (strong) randomness (for Nettle)]),
NAME_OF_RANDOM_DEVICE=$enableval)
AC_MSG_RESULT([$NAME_OF_RANDOM_DEVICE])
AC_MSG_CHECKING([device with pseudo random data...])
AC_ARG_ENABLE([pseudo-random-device],
AS_HELP_STRING([--enable-pseudo-random-device],
[device with pseudo randomness (for Nettle)]),
NAME_OF_PSEUDO_RANDOM_DEVICE=$enableval)
AC_MSG_RESULT([$NAME_OF_PSEUDO_RANDOM_DEVICE])
AC_MSG_CHECKING([device with unpredictable data for nonces...])
AC_ARG_ENABLE([nonce-device],
AS_HELP_STRING([--enable-nonce-device],
[device with unpredictable nonces (for Nettle)]),
NAME_OF_NONCE_DEVICE=$enableval)
AC_MSG_RESULT([$NAME_OF_NONCE_DEVICE])
if test "$cross_compiling" != yes; then
if test "$NAME_OF_RANDOM_DEVICE" != "no"; then
AC_CHECK_FILE([$NAME_OF_RANDOM_DEVICE],,
AC_MSG_WARN([[Device '$NAME_OF_RANDOM_DEVICE' does not exist, consider to use --enable-random-device]]))
fi
if test "$NAME_OF_PSEUDO_RANDOM_DEVICE" != "no"; then
AC_CHECK_FILE([$NAME_OF_PSEUDO_RANDOM_DEVICE],,
AC_MSG_WARN([[Device '$NAME_OF_PSEUDO_RANDOM_DEVICE' does not exist, consider to use --enable-pseudo-random-device]]))
fi
if test "$NAME_OF_NONCE_DEVICE" != "no"; then
AC_CHECK_FILE([$NAME_OF_NONCE_DEVICE],,
AC_MSG_WARN([[Device '$NAME_OF_NONCE_DEVICE' does not exist, consider to use --enable-nonce-device]]))
fi
else
AC_MSG_NOTICE([[Cross compiling, assuming random devices exists on the target host...]])
fi
# FIXME?: Open+read 42 bytes+close twice and compare data. Should differ.
AC_DEFINE_UNQUOTED([NAME_OF_RANDOM_DEVICE], ["$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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