Forgot this earlier; delete the old /dev/random driver, bring in the

header for the new.
Reviewed by:	dfr

2 files changed, 20 insertions, 469 deletions

diff --git a/sys/kern/kern_random.c b/sys/kern/kern_random.c
deleted file mode 100644
index 84d1c6f..0000000
--- a/sys/kern/kern_random.c
+++ /dev/null
@@ -1,393 +0,0 @@
-/*
- * kern_random.c -- A strong random number generator
- *
- * $FreeBSD$
- *
- * Version 0.95, last modified 18-Oct-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.
- */
-
-#include <sys/param.h>
-#include <sys/kernel.h>
-#include <sys/md5.h>
-#include <sys/poll.h>
-#include <sys/random.h>
-#include <sys/systm.h>
-#include <sys/select.h>
-#include <sys/timetc.h>
-
-#ifdef __i386__
-#include <i386/isa/icu.h>
-#endif
-#ifdef __alpha__
-/*
-	XXX  the below should be used.  However there is too much "16"
-	hardcodeing in kern_random.c right now. -- obrien
-#include <machine/ipl.h>
-#if NHWI > 0
-#define	ICU_LEN (NHWI)
-#else
-#define	ICU_LEN (NSWI)
-#endif
-*/
-#define	ICU_LEN 16
-#endif
-
-#define MAX_BLKDEV 4
-
-/*
- * The pool is stirred with a primitive polynomial of degree 128
- * over GF(2), namely x^128 + x^99 + x^59 + x^31 + x^9 + x^7 + 1.
- * For a pool of size 64, try x^64+x^62+x^38+x^10+x^6+x+1.
- */
-#define POOLWORDS 128    /* Power of 2 - note that this is 32-bit words */
-#define POOLBITS (POOLWORDS*32)
-
-#if POOLWORDS == 128
-#define TAP1    99     /* The polynomial taps */
-#define TAP2    59
-#define TAP3    31
-#define TAP4    9
-#define TAP5    7
-#elif POOLWORDS == 64
-#define TAP1    62      /* The polynomial taps */
-#define TAP2    38
-#define TAP3    10
-#define TAP4    6
-#define TAP5    1
-#else
-#error No primitive polynomial available for chosen POOLWORDS
-#endif
-
-#define WRITEBUFFER 512 /* size in bytes */
-
-/* There is actually only one of these, globally. */
-struct random_bucket {
-	u_int	add_ptr;
-	u_int	entropy_count;
-	int	input_rotate;
-	u_int32_t *pool;
-	struct	selinfo rsel;
-};
-
-/* There is one of these per entropy source */
-struct timer_rand_state {
-	u_long	last_time;
-	int 	last_delta;
-	int 	nbits;
-};
-
-static struct random_bucket random_state;
-static u_int32_t random_pool[POOLWORDS];
-static struct timer_rand_state keyboard_timer_state;
-static struct timer_rand_state extract_timer_state;
-static struct timer_rand_state irq_timer_state[ICU_LEN];
-#ifdef notyet
-static struct timer_rand_state blkdev_timer_state[MAX_BLKDEV];
-#endif
-static struct wait_queue *random_wait;
-
-#ifndef MIN
-#define MIN(a,b) (((a) < (b)) ? (a) : (b))
-#endif
-	
-void
-rand_initialize(void)
-{
-	random_state.add_ptr = 0;
-	random_state.entropy_count = 0;
-	random_state.pool = random_pool;
-	random_wait = NULL;
-	random_state.rsel.si_flags = 0;
-	random_state.rsel.si_pid = 0;
-}
-
-/*
- * This function adds an int into the entropy "pool".  It does not
- * update the entropy estimate.  The caller must do this if appropriate.
- *
- * The pool is stirred with a primitive polynomial of degree 128
- * over GF(2), namely x^128 + x^99 + x^59 + x^31 + x^9 + x^7 + 1.
- * For a pool of size 64, try x^64+x^62+x^38+x^10+x^6+x+1.
- * 
- * We rotate the input word by a changing number of bits, to help
- * assure that all bits in the entropy get toggled.  Otherwise, if we
- * consistently feed the entropy pool small numbers (like ticks and
- * scancodes, for example), the upper bits of the entropy pool don't
- * get affected. --- TYT, 10/11/95
- */
-static __inline void
-add_entropy_word(struct random_bucket *r, const u_int32_t input)
-{
-	u_int i;
-	u_int32_t w;
-
-	w = (input << r->input_rotate) | (input >> (32 - r->input_rotate));
-	i = r->add_ptr = (r->add_ptr - 1) & (POOLWORDS-1);
-	if (i)
-		r->input_rotate = (r->input_rotate + 7) & 31;
-	else
-		/*
-		 * At the beginning of the pool, add an extra 7 bits
-		 * rotation, so that successive passes spread the
-		 * input bits across the pool evenly.
-		 */
-		r->input_rotate = (r->input_rotate + 14) & 31;
-
-	/* XOR in the various taps */
-	w ^= r->pool[(i+TAP1)&(POOLWORDS-1)];
-	w ^= r->pool[(i+TAP2)&(POOLWORDS-1)];
-	w ^= r->pool[(i+TAP3)&(POOLWORDS-1)];
-	w ^= r->pool[(i+TAP4)&(POOLWORDS-1)];
-	w ^= r->pool[(i+TAP5)&(POOLWORDS-1)];
-	w ^= r->pool[i];
-	/* Rotate w left 1 bit (stolen from SHA) and store */
-	r->pool[i] = (w << 1) | (w >> 31);
-}
-
-/*
- * This function adds entropy to the entropy "pool" by using timing
- * delays.  It uses the timer_rand_state structure to make an estimate
- * of how  any bits of entropy this call has added to the pool.
- *
- * The number "num" is also added to the pool - it should somehow describe
- * the type of event which just happened.  This is currently 0-255 for
- * keyboard scan codes, and 256 upwards for interrupts.
- * On the i386, this is assumed to be at most 16 bits, and the high bits
- * are used for a high-resolution timer.
- */
-static void
-add_timer_randomness(struct random_bucket *r, struct timer_rand_state *state,
-	u_int num)
-{
-	int		delta, delta2;
-	u_int		nbits;
-	u_int32_t	time;
-
-	num ^= timecounter->tc_get_timecount(timecounter) << 16;
-	r->entropy_count += 2;
-		
-	time = ticks;
-
-	add_entropy_word(r, (u_int32_t) num);
-	add_entropy_word(r, time);
-
-	/*
-	 * Calculate number of bits of randomness we probably
-	 * added.  We take into account the first and second order
-	 * deltas in order to make our estimate.
-	 */
-	delta = time - state->last_time;
-	state->last_time = time;
-
-	delta2 = delta - state->last_delta;
-	state->last_delta = delta;
-
-	if (delta < 0) delta = -delta;
-	if (delta2 < 0) delta2 = -delta2;
-	delta = MIN(delta, delta2) >> 1;
-	for (nbits = 0; delta; nbits++)
-		delta >>= 1;
-
-	r->entropy_count += nbits;
-	
-	/* Prevent overflow */
-	if (r->entropy_count > POOLBITS)
-		r->entropy_count = POOLBITS;
-
-	if (r->entropy_count >= 8)
-		selwakeup(&random_state.rsel);
-}
-
-void
-add_keyboard_randomness(u_char scancode)
-{
-	add_timer_randomness(&random_state, &keyboard_timer_state, scancode);
-}
-
-void
-add_interrupt_randomness(void *vsc)
-{
-	int intr;
-	struct random_softc *sc = vsc;
-
-	(sc->sc_handler)(sc->sc_arg);
-	intr = sc->sc_intr;
-	add_timer_randomness(&random_state, &irq_timer_state[intr], intr);
-}
-
-#ifdef notused
-void
-add_blkdev_randomness(int major)
-{
-	if (major >= MAX_BLKDEV)
-		return;
-
-	add_timer_randomness(&random_state, &blkdev_timer_state[major],
-			     0x200+major);
-}
-#endif /* notused */
-
-#if POOLWORDS % 16
-#error extract_entropy() assumes that POOLWORDS is a multiple of 16 words.
-#endif
-/*
- * This function extracts randomness from the "entropy pool", and
- * returns it in a buffer.  This function computes how many remaining
- * bits of entropy are left in the pool, but it does not restrict the
- * number of bytes that are actually obtained.
- */
-static __inline int
-extract_entropy(struct random_bucket *r, char *buf, int nbytes)
-{
-	int ret, i;
-	u_int32_t tmp[4];
-	
-	add_timer_randomness(r, &extract_timer_state, nbytes);
-	
-	/* Redundant, but just in case... */
-	if (r->entropy_count > POOLBITS) 
-		r->entropy_count = POOLBITS;
-	/* Why is this here?  Left in from Ted Ts'o.  Perhaps to limit time. */
-	if (nbytes > 32768)
-		nbytes = 32768;
-
-	ret = nbytes;
-	if (r->entropy_count / 8 >= nbytes)
-		r->entropy_count -= nbytes*8;
-	else
-		r->entropy_count = 0;
-
-	while (nbytes) {
-		/* Hash the pool to get the output */
-		tmp[0] = 0x67452301;
-		tmp[1] = 0xefcdab89;
-		tmp[2] = 0x98badcfe;
-		tmp[3] = 0x10325476;
-		for (i = 0; i < POOLWORDS; i += 16)
-			MD5Transform(tmp, (char *)(r->pool+i));
-		/* Modify pool so next hash will produce different results */
-		add_entropy_word(r, tmp[0]);
-		add_entropy_word(r, tmp[1]);
-		add_entropy_word(r, tmp[2]);
-		add_entropy_word(r, tmp[3]);
-		/*
-		 * Run the MD5 Transform one more time, since we want
-		 * to add at least minimal obscuring of the inputs to
-		 * add_entropy_word().  --- TYT
-		 */
-		MD5Transform(tmp, (char *)(r->pool));
-		
-		/* Copy data to destination buffer */
-		i = MIN(nbytes, 16);
-		bcopy(tmp, buf, i);
-		nbytes -= i;
-		buf += i;
-	}
-
-	/* Wipe data from memory */
-	bzero(tmp, sizeof(tmp));
-	
-	return ret;
-}
-
-#ifdef notused /* XXX NOT the exported kernel interface */
-/*
- * This function is the exported kernel interface.  It returns some
- * number of good random numbers, suitable for seeding TCP sequence
- * numbers, etc.
- */
-void
-get_random_bytes(void *buf, u_int nbytes)
-{
-	extract_entropy(&random_state, (char *) buf, nbytes);
-}
-#endif /* notused */
-
-u_int
-read_random(void *buf, u_int nbytes)
-{
-	if ((nbytes * 8) > random_state.entropy_count)
-		nbytes = random_state.entropy_count / 8;
-	
-	return extract_entropy(&random_state, (char *)buf, nbytes);
-}
-
-u_int
-read_random_unlimited(void *buf, u_int nbytes)
-{
-	return extract_entropy(&random_state, (char *)buf, nbytes);
-}
-
-#ifdef notused
-u_int
-write_random(const char *buf, u_int nbytes)
-{
-	u_int i;
-	u_int32_t word, *p;
-
-	for (i = nbytes, p = (u_int32_t *)buf;
-	     i >= sizeof(u_int32_t);
-	     i-= sizeof(u_int32_t), p++)
-		add_entropy_word(&random_state, *p);
-	if (i) {
-		word = 0;
-		bcopy(p, &word, i);
-		add_entropy_word(&random_state, word);
-	}
-	return nbytes;
-}
-#endif /* notused */
-
-int
-random_poll(dev_t dev, int events, struct proc *p)
-{
-	int s;
-	int revents = 0;
-
-	s = splhigh();
-	if (events & (POLLIN | POLLRDNORM)) {
-		if (random_state.entropy_count >= 8)
-			revents |= events & (POLLIN | POLLRDNORM);
-		else
-			selrecord(p, &random_state.rsel);
-	}
-	splx(s);
-	if (events & (POLLOUT | POLLWRNORM))
-		revents |= events & (POLLOUT | POLLWRNORM);	/* heh */
-
-	return (revents);
-}
-
diff --git a/sys/sys/random.h b/sys/sys/random.h
index f9fa123..d25dfcf 100644
--- a/sys/sys/random.h
+++ b/sys/sys/random.h
@@ -1,91 +1,35 @@
-/*
- * random.h -- A strong random number generator
- *
- * $FreeBSD$
- *
- * Version 0.95, last modified 18-Oct-95
- * 
- * Copyright Theodore Ts'o, 1994, 1995.  All rights reserved.
+/*-
+ * 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, and the entire permission notice in its entirety,
- *    including the disclaimer of warranties.
+ *    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.
- * 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.
- * 
+ * 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.
+ *
+ * $FreeBSD$
  */
 
 #ifndef	_SYS_RANDOM_H_
 #define	_SYS_RANDOM_H_
 
-#include <sys/ioccom.h>
-
-#define	MEM_SETIRQ	_IOW('r', 1, u_int16_t)	/* set interrupt */
-#define	MEM_CLEARIRQ	_IOW('r', 2, u_int16_t)	/* clear interrupt */
-#define	MEM_RETURNIRQ	_IOR('r', 3, u_int16_t)	/* return interrupt */
-
-#ifdef _KERNEL
-
-/* Type of the cookie passed to add_interrupt_randomness. */
-
-struct random_softc {
-	inthand2_t	*sc_handler;
-	void		*sc_arg;
-	int		sc_intr;
-};
-
-/* Exported functions */
-
-void rand_initialize(void);
-void add_keyboard_randomness(u_char scancode);
-inthand2_t add_interrupt_randomness;
-#ifdef notused
-void add_blkdev_randomness(int major);
-#endif
-
-#ifdef notused
-void get_random_bytes(void *buf, u_int nbytes);
-#endif
-u_int read_random(void *buf, u_int size);
-u_int read_random_unlimited(void *buf, u_int size);
-#ifdef notused
-u_int write_random(const char *buf, u_int nbytes);
-#endif
-struct proc;
-int random_poll(dev_t dev, int events, struct proc *p);
-
-#endif /* _KERNEL */
+u_int read_random(char *, u_int);
+void write_random(char *, u_int);
 
-#endif /* !_SYS_RANDOM_H_ */
+#endif /* _SYS_RANDOM_H_ */