Theodore Ts'po's random number gernerator for Linux, ported by me.

This code will only be included in your kernel if you have
'options DEVRANDOM', but that will fall away in a couple of days.
Obtained from: Theodore Ts'o, Linux

1 files changed, 72 insertions, 0 deletions

diff --git a/sys/i386/include/random.h b/sys/i386/include/random.h
new file mode 100644
index 000000000000..78a6b06a894c
--- /dev/null
+++ b/sys/i386/include/random.h
@@ -0,0 +1,72 @@
+/*
+ * random.h -- A strong random number generator
+ *
+ * $Id$
+ *
+ * Version 0.92, last modified 21-Sep-95
+ * 
+ * Copyright Theodore Ts'o, 1994, 1995.  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, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 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.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ * 
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ * 
+ * THIS SOFTWARE IS PROVIDED ``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.
+ *
+ */
+
+/*
+ * Many kernel routines will have a use for good random numbers,
+ * for example, for truely random TCP sequence numbers, which prevent
+ * certain forms of TCP spoofing attacks.
+ * 
+ */
+
+#ifndef _MACHINE_RANDOM_H_
+#define _MACHINE_RANDOM_H_ 1
+
+#include <sys/ioctl.h>
+
+#define	MEM_SETIRQ	_IOW('r', 1, int)	/* set interrupt */
+#define	MEM_CLEARIRQ	_IOW('r', 2, int)	/* clear interrupt */
+#define	MEM_RETURNIRQ	_IOR('r', 3, int)	/* return interrupt */
+
+/* Interrupts to be used in the randomising process */
+
+extern u_int16_t interrupt_allowed;
+
+/* Exported functions */
+
+void rand_initialize(void);
+void add_keyboard_randomness(u_char scancode);
+
+void get_random_bytes(void *buf, u_int nbytes);
+u_int read_random(char *buf, u_int size);
+u_int read_random_unlimited(char *buf, u_int size);
+
+#endif