Move /dev/*random stuff to separate m4 file.

1 files changed, 87 insertions, 0 deletions

diff --git a/m4/gc_random.m4 b/m4/gc_random.m4
new file mode 100644
index 0000000000..3f90740c8a
--- /dev/null
+++ b/m4/gc_random.m4
@@ -0,0 +1,87 @@
+# 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.
+#
+# This file can can be used in projects which are not available under
+# the GNU General Public License or the GNU Library General Public
+# License but which still want to provide support for Autobuild.
+
+# 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])
+])