# gc-random.m4 serial 2 dnl Copyright (C) 2005-2007 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 "$host_os" in *openbsd*) NAME_OF_RANDOM_DEVICE="/dev/srandom" NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/prandom" NAME_OF_NONCE_DEVICE="/dev/urandom" ;; *netbsd*) NAME_OF_RANDOM_DEVICE="/dev/srandom" NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/urandom" NAME_OF_NONCE_DEVICE="/dev/urandom" ;; *solaris* | *irix* | *dec-osf* ) NAME_OF_RANDOM_DEVICE="/dev/random" NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/random" NAME_OF_NONCE_DEVICE="/dev/random" ;; *) NAME_OF_RANDOM_DEVICE="/dev/random" NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/urandom" NAME_OF_NONCE_DEVICE="/dev/urandom" ;; esac AC_MSG_CHECKING([device with (strong) random data...]) AC_ARG_ENABLE(random-device, AC_HELP_STRING([--enable-random-device], [device with (strong) randomness (for Nettle)]), NAME_OF_RANDOM_DEVICE=$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($NAME_OF_NONCE_DEVICE) if test "$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]) ])