+# gc-random.m4 serial 1
+dnl Copyright (C) 2005, 2006 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?
+
+ case "${target}" in
+ *-openbsd*)
+ NAME_OF_RANDOM_DEVICE="/dev/srandom"
+ NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/prandom"
+ NAME_OF_NONCE_DEVICE="/dev/urandom"
+ ;;
+
+ *-netbsd*)
+ NAME_OF_RANDOM_DEVICE="/dev/srandom"
+ NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/urandom"
+ NAME_OF_NONCE_DEVICE="/dev/urandom"
+ ;;
+
+ *-solaris* | *-irix* | *-dec-osf* )
+ NAME_OF_RANDOM_DEVICE="/dev/random"
+ NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/random"
+ NAME_OF_NONCE_DEVICE="/dev/random"
+ ;;
+
+ *)
+ NAME_OF_RANDOM_DEVICE="/dev/random"
+ NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/urandom"
+ NAME_OF_NONCE_DEVICE="/dev/urandom"
+ ;;
+ esac
+
+ AC_MSG_CHECKING([device with (strong) random data...])
+ AC_ARG_ENABLE(random-device,
+ AC_HELP_STRING([--enable-random-device],
+ [device with (strong) randomness (for Nettle)]),
+ test "$enableval" != "no" && 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)]),
+ test "$enableval" != "no" && NAME_OF_PSEUDO_RANDOM_DEVICE=$enableval)
+ AC_MSG_RESULT($NAME_OF_PSEUDO_RANDOM_DEVICE)
+
+ AC_MSG_CHECKING([device with unpredictable data for nonces...])
+ AC_ARG_ENABLE(nonce-device,
+ AC_HELP_STRING([--enable-nonce-device],
+ [device with unpredictable nonces (for Nettle)]),
+ test "$enableval" != "no" && NAME_OF_NONCE_DEVICE=$enableval)
+ AC_MSG_RESULT($NAME_OF_NONCE_DEVICE)
+
+ if test "$cross_compiling" != yes; then
+ AC_CHECK_FILE($NAME_OF_RANDOM_DEVICE,,
+ AC_MSG_WARN([[device for (strong) random data `$NAME_OF_RANDOM_DEVICE' does not exist]]))
+ AC_CHECK_FILE($NAME_OF_PSEUDO_RANDOM_DEVICE,,
+ AC_MSG_WARN([[device for pseudo-random data `$NAME_OF_PSEUDO_RANDOM_DEVICE' does not exist]]))
+ AC_CHECK_FILE($NAME_OF_NONCE_DEVICE,,
+ AC_MSG_WARN([[device for unpredictable nonces `$NAME_OF_NONCE_DEVICE' does not exist]]))
+ else
+ AC_MSG_NOTICE([[Cross compiling, assuming random devices exists on the target host...]])
+ fi
+
+ # FIXME?: Open+read 42 bytes+close twice and compare data. Should differ.
+
+ AC_DEFINE_UNQUOTED(NAME_OF_RANDOM_DEVICE, "$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])
+
+ AC_DEFINE(GC_USE_RANDOM, 1, [Define if you want to support RNG through GC.])
+])