New machine-independant /dev/random driver.

This is work-in-progress, and the entropy-gathering routines are not
yet present. As such, this should be viewed as a pretty reasonable
PRNG with _ABSOLUTELY_NO_ security!!

Entropy gathering will be the subject of ongoing work.

This is written as a module, and as such is unloadable, but there is
no refcounting done. I would like to use something like device_busy(9)
to achieve this (eventually).

Lots of useful ideas from:	bde, phk, Jeroen van Gelderen

Reviewed by:	dfr

1 files changed, 42 insertions, 0 deletions

diff --git a/sys/dev/random/yarrow.h b/sys/dev/random/yarrow.h
new file mode 100644
index 0000000..6fb557e
--- /dev/null
+++ b/sys/dev/random/yarrow.h
@@ -0,0 +1,42 @@
+/*-
+ * Copyright (c) 2000 Mark 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.
+ *
+ * $FreeBSD$
+ */
+
+#define BINS	10		/* t */
+#define KEYSIZE	32		/* 32 bytes == 256 bits */
+
+/* This is the beasite that needs protecting. It contains all of the
+ * state that we are excited about.
+ */
+struct state {
+	u_int64_t counter;		/* C */
+	BF_KEY key;			/* K */
+	unsigned char ivec[8];		/* Blowfish internal */
+	int gengateinterval;		/* Pg */
+	int outputblocks;
+	unsigned char randomstuff[1024]; /* XXX to be done properly */
+};