mirror of
https://gitlab.isc.org/isc-projects/bind9
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90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
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/*
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* Copyright (C) 2000 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <isc/buffer.h>
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#include <isc/entropy.h>
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#include <isc/region.h>
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#include <isc/string.h>
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#include <isc/util.h>
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/*
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* Much of this code is modeled after the NetBSD /dev/random implementation,
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* written by Michael Graff <explorer@netbsd.org>.
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*/
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/***
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*** "constants." Do not change these unless you _really_ know what
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*** you are doing.
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***/
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/*
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* size of entropy pool in 32-bit words. This _MUST_ be a power of 2.
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*/
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#define RND_POOLWORDS 128
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#define RND_POOLBITS (RND_POOLWORDS * 32)
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/*
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* Number of bytes returned per hash.
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*/
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#define RND_ENTROPY_THRESHOLD 12
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/*
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* Size of the input event queue. This _MUST_ be a power of 2.
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*/
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#define RND_EVENTQSIZE 128
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typedef struct {
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u_int32_t cursor; /* current add point in the pool */
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u_int32_t entropy; /* current entropy estimate in bits */
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u_int32_t rotate; /* how many bits to rotate by */
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u_int32_t pool[RND_POOLWORDS]; /* random pool data */
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} isc_rndpool_t;
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typedef struct {
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char name[16]; /* device name */
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u_int32_t last_time; /* last time recorded */
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u_int32_t last_delta; /* last delta value */
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u_int32_t last_delta2; /* last delta2 value */
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u_int32_t total; /* entropy from this source */
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u_int32_t type; /* type */
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u_int32_t flags; /* flags */
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void *state; /* state informaiton */
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} isc_rndsource_t;
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/*
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* Flags to control the source. Low byte is type, upper bits are flags.
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*/
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#define RND_FLAG_NO_ESTIMATE 0x00000100 /* don't estimate entropy */
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#define RND_FLAG_NO_COLLECT 0x00000200 /* don't collect entropy */
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#define RND_TYPE_UNKNOWN 0 /* unknown source */
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#define RND_TYPE_DISK 1 /* source is physical disk */
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#define RND_TYPE_NET 2 /* source is a network device */
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#define RND_TYPE_TAPE 3 /* source is a tape drive */
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#define RND_TYPE_TTY 4 /* source is a tty device */
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#define RND_TYPE_MAX 4 /* last type id used */
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/*
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* Select "good" randomness or any at all (pseudorandom).
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*/
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#define RND_EXTRACT_ANY 0 /* Extract anything, even if no entropy */
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#define RND_EXTRACT_GOOD 1 /* Return only good data */
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