sys/sys/random.h

   1 /*
   2  * random.h -- A strong random number generator
   3  *
   4  * $FreeBSD: src/sys/sys/random.h,v 1.19.2.2 2002/09/17 17:11:54 sam Exp $
   5  * $DragonFly: src/sys/sys/random.h,v 1.6 2005/11/02 22:59:49 dillon Exp $
   6  *
   7  * Version 0.95, last modified 18-Oct-95
   8  *
   9  * Copyright Theodore Ts'o, 1994, 1995.  All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, and the entire permission notice in its entirety,
  16  *    including the disclaimer of warranties.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. The name of the author may not be used to endorse or promote
  21  *    products derived from this software without specific prior
  22  *    written permission.
  23  *
  24  * ALTERNATIVELY, this product may be distributed under the terms of
  25  * the GNU Public License, in which case the provisions of the GPL are
  26  * required INSTEAD OF the above restrictions.  (This clause is
  27  * necessary due to a potential bad interaction between the GPL and
  28  * the restrictions contained in a BSD-style copyright.)
  29  *
  30  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  31  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  32  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  33  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  34  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  35  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  36  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  37  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  38  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  39  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  40  * OF THE POSSIBILITY OF SUCH DAMAGE.
  41  *
  42  */
  43
  44 /*
  45  * Many kernel routines will have a use for good random numbers,
  46  * for example, for truely random TCP sequence numbers, which prevent
  47  * certain forms of TCP spoofing attacks.
  48  *
  49  */
  50
  51 #ifndef _SYS_RANDOM_H_
  52 #define _SYS_RANDOM_H_
  53
  54 #ifndef _SYS_INTERRUPT_H_
  55 #include <sys/interrupt.h>
  56 #endif
  57
  58 #include <sys/ioccom.h>
  59
  60 #define MEM_SETIRQ      _IOW('r', 1, u_int16_t) /* set interrupt */
  61 #define MEM_CLEARIRQ    _IOW('r', 2, u_int16_t) /* clear interrupt */
  62 #define MEM_RETURNIRQ   _IOR('r', 3, u_int16_t) /* obsolete */
  63 #define MEM_FINDIRQ     _IOWR('r', 4, u_int16_t) /* next interrupt */
  64
  65 #ifdef _KERNEL
  66
  67 /* Type of the cookie passed to add_interrupt_randomness. */
  68
  69 struct random_softc {
  70         int             sc_intr;
  71         int             sc_enabled;
  72 };
  73
  74 /* Exported functions */
  75
  76 void rand_initialize(void);
  77 void add_keyboard_randomness(u_char scancode);
  78 void add_interrupt_randomness(int intr);
  79 #ifdef notused
  80 void add_blkdev_randomness(int major);
  81 #endif
  82 void add_true_randomness(int);
  83
  84 #ifdef notused
  85 void get_random_bytes(void *buf, u_int nbytes);
  86 #endif
  87 u_int read_random(void *buf, u_int size);
  88 u_int read_random_unlimited(void *buf, u_int size);
  89 #ifdef notused
  90 u_int write_random(const char *buf, u_int nbytes);
  91 #endif
  92 struct thread;
  93 int random_poll(dev_t dev, int events, struct thread *td);
  94
  95 #endif /* _KERNEL */
  96
  97 #endif /* !_SYS_RANDOM_H_ */