Add entropy gathering code. This will work whether the module is

compiled in or loaded.

1 files changed, 81 insertions, 0 deletions

diff --git a/sys/dev/random/harvest.c b/sys/dev/random/harvest.c
new file mode 100644
index 000000000000..ceb9f9f3a5c6
--- /dev/null
+++ b/sys/dev/random/harvest.c
@@ -0,0 +1,81 @@
+/*-
+ * Copyright (c) 2000 Mark R V Murray
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/types.h>
+#include <sys/queue.h>
+#include <sys/linker.h>
+#include <sys/libkern.h>
+#include <sys/mbuf.h>
+#include <sys/random.h>
+#include <sys/time.h>
+#include <crypto/blowfish/blowfish.h>
+
+#include <dev/randomdev/yarrow.h>
+
+/* hold the address of the routine which is actually called if */
+/* the ramdomdev is loaded                                     */
+static void (*reap)(struct timespec *, u_int64_t, u_int, u_int, u_int) = NULL;
+
+/* Initialise the harvester at load time */
+void
+random_init_harvester(void (*reaper)(struct timespec *, u_int64_t, u_int, u_int, u_int))
+{
+	intrmask_t mask;
+
+	mask = splhigh();
+	reap = reaper;
+	splx(mask);
+}
+
+/* Deinitialise the harvester at unload time */
+void
+random_deinit_harvester(void)
+{
+	intrmask_t mask;
+
+	mask = splhigh();
+	reap = NULL;
+	splx(mask);
+}
+
+/* Entropy harvesting routine. This is supposed to be fast; do */
+/* not do anything slow in here!                               */
+/* Implemented as in indirect call to allow non-inclusion of   */
+/* the entropy device.                                         */
+void
+random_harvest(u_int64_t entropy, u_int bits, u_int frac, u_int source)
+{
+	struct timespec nanotime;
+
+	if (reap) {
+		getnanotime(&nanotime);
+		(*reap)(&nanotime, entropy, bits, frac, source);
+	}
+}