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Annotation of sys/dev/rndvar.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: rndvar.h,v 1.19 2003/11/03 18:24:28 tedu Exp $        */
                      2:
                      3: /*
                      4:  * Copyright (c) 1996,2000 Michael Shalayeff.
                      5:  *
                      6:  * This software derived from one contributed by Theodore Ts'o.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  *
                     17:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     27:  * SUCH DAMAGE.
                     28:  *
                     29:  */
                     30:
                     31: #ifndef __RNDVAR_H__
                     32: #define __RNDVAR_H__
                     33:
                     34: #define POOLWORDS 1024 /* Power of 2 - note that this is 32-bit words */
                     35:
                     36: #define        RND_RND         0       /* real randomness like nuclear chips */
                     37: #define        RND_SRND        1       /* strong random source */
                     38: #define        RND_URND        2       /* less strong random source */
                     39: #define        RND_PRND        3       /* pseudo random source */
                     40: #define RND_ARND       4       /* aRC4 based random number generator */
                     41: #define RND_NODEV      5       /* First invalid minor device number */
                     42:
                     43: #define        RND_SRC_TRUE    0
                     44: #define        RND_SRC_TIMER   1
                     45: #define        RND_SRC_MOUSE   2
                     46: #define        RND_SRC_TTY     3
                     47: #define        RND_SRC_DISK    4
                     48: #define        RND_SRC_NET     5
                     49: #define        RND_SRC_AUDIO   6
                     50: #define        RND_SRC_VIDEO   7
                     51: #define        RND_SRC_NUM     8
                     52:
                     53: struct rndstats {
                     54:        quad_t rnd_total;       /* total bits of entropy generated */
                     55:        quad_t rnd_used;        /* strong data bits read so far */
                     56:        quad_t rnd_reads;       /* strong read calls */
                     57:        quad_t arc4_reads;      /* aRC4 data bytes read so far */
                     58:        quad_t arc4_nstirs;     /* arc4 pool stirs */
                     59:        quad_t arc4_stirs;      /* arc4 pool stirs (bits used) */
                     60:
                     61:        quad_t rnd_pad[5];
                     62:
                     63:        quad_t rnd_waits;       /* sleeps for data */
                     64:        quad_t rnd_enqs;        /* enqueue calls */
                     65:        quad_t rnd_deqs;        /* dequeue calls */
                     66:        quad_t rnd_drops;       /* queue-full drops */
                     67:        quad_t rnd_drople;      /* queue low watermark low entropy drops */
                     68:
                     69:        quad_t rnd_ed[32];      /* entropy feed distribution */
                     70:        quad_t rnd_sc[RND_SRC_NUM]; /* add* calls */
                     71:        quad_t rnd_sb[RND_SRC_NUM]; /* add* bits */
                     72: };
                     73:
                     74: #ifdef _KERNEL
                     75: extern struct rndstats rndstats;
                     76:
                     77: #define        add_true_randomness(d)  enqueue_randomness(RND_SRC_TRUE,  (int)(d))
                     78: #define        add_timer_randomness(d) enqueue_randomness(RND_SRC_TIMER, (int)(d))
                     79: #define        add_mouse_randomness(d) enqueue_randomness(RND_SRC_MOUSE, (int)(d))
                     80: #define        add_tty_randomness(d)   enqueue_randomness(RND_SRC_TTY,   (int)(d))
                     81: #define        add_disk_randomness(d)  enqueue_randomness(RND_SRC_DISK,  (int)(d))
                     82: #define        add_net_randomness(d)   enqueue_randomness(RND_SRC_NET,   (int)(d))
                     83: #define        add_audio_randomness(d) enqueue_randomness(RND_SRC_AUDIO, (int)(d))
                     84: #define        add_video_randomness(d) enqueue_randomness(RND_SRC_VIDEO, (int)(d))
                     85:
                     86: void enqueue_randomness(int, int);
                     87: void get_random_bytes(void *, size_t);
                     88: void arc4random_bytes(void *, size_t);
                     89: u_int32_t arc4random(void);
                     90:
                     91: #endif /* _KERNEL */
                     92:
                     93: #endif /* __RNDVAR_H__ */