Gecko [ armaneco.co.uk ]

Name	Size	Permission	Date
aes.h	1.05 KB	-rw-r--r--	2025-03-04 13:53
app.h	10.23 KB	-rw-r--r--	2025-03-04 13:53
assertions.h	2.78 KB	-rw-r--r--	2025-03-04 13:53
atomic.h	4.15 KB	-rw-r--r--	2025-03-04 13:53
backtrace.h	3.8 KB	-rw-r--r--	2025-03-04 13:53
base32.h	3.94 KB	-rw-r--r--	2025-03-04 13:53
base64.h	2.39 KB	-rw-r--r--	2025-03-04 13:53
bind9.h	849 B	-rw-r--r--	2025-03-04 13:53
boolean.h	746 B	-rw-r--r--	2025-03-04 13:53
buffer.h	25.69 KB	-rw-r--r--	2025-03-04 13:53
bufferlist.h	1.42 KB	-rw-r--r--	2025-03-04 13:53
commandline.h	1.69 KB	-rw-r--r--	2025-03-04 13:53
condition.h	1.44 KB	-rw-r--r--	2025-03-04 13:53
counter.h	1.88 KB	-rw-r--r--	2025-03-04 13:53
crc64.h	986 B	-rw-r--r--	2025-03-04 13:53
deprecated.h	622 B	-rw-r--r--	2025-03-04 13:53
dir.h	1.96 KB	-rw-r--r--	2025-03-04 13:53
entropy.h	8.76 KB	-rw-r--r--	2025-03-04 13:53
errno.h	658 B	-rw-r--r--	2025-03-04 13:53
errno2result.h	893 B	-rw-r--r--	2025-03-04 13:53
error.h	1.4 KB	-rw-r--r--	2025-03-04 13:53
event.h	2.98 KB	-rw-r--r--	2025-03-04 13:53
eventclass.h	1.35 KB	-rw-r--r--	2025-03-04 13:53
file.h	11.43 KB	-rw-r--r--	2025-03-04 13:53
formatcheck.h	892 B	-rw-r--r--	2025-03-04 13:53
fsaccess.h	7.25 KB	-rw-r--r--	2025-03-04 13:53
hash.h	7.52 KB	-rw-r--r--	2025-03-04 13:53
heap.h	5.14 KB	-rw-r--r--	2025-03-04 13:53
hex.h	2.33 KB	-rw-r--r--	2025-03-04 13:53
hmacmd5.h	1.75 KB	-rw-r--r--	2025-03-04 13:53
hmacsha.h	4.44 KB	-rw-r--r--	2025-03-04 13:53
ht.h	4.29 KB	-rw-r--r--	2025-03-04 13:53
httpd.h	2.26 KB	-rw-r--r--	2025-03-04 13:53
int.h	1.37 KB	-rw-r--r--	2025-03-04 13:53
interfaceiter.h	3.03 KB	-rw-r--r--	2025-03-04 13:53
iterated_hash.h	1.02 KB	-rw-r--r--	2025-03-04 13:53
json.h	1.42 KB	-rw-r--r--	2025-03-04 13:53
keyboard.h	976 B	-rw-r--r--	2025-03-04 13:53
lang.h	636 B	-rw-r--r--	2025-03-04 13:53
lex.h	9.42 KB	-rw-r--r--	2025-03-04 13:53
lfsr.h	2.88 KB	-rw-r--r--	2025-03-04 13:53
lib.h	1.04 KB	-rw-r--r--	2025-03-04 13:53
likely.h	718 B	-rw-r--r--	2025-03-04 13:53
list.h	5.65 KB	-rw-r--r--	2025-03-04 13:53
log.h	28.06 KB	-rw-r--r--	2025-03-04 13:53
magic.h	993 B	-rw-r--r--	2025-03-04 13:53
md5.h	2.34 KB	-rw-r--r--	2025-03-04 13:53
mem.h	20.63 KB	-rw-r--r--	2025-03-04 13:53
meminfo.h	690 B	-rw-r--r--	2025-03-04 13:53
msgcat.h	2.66 KB	-rw-r--r--	2025-03-04 13:53
msgs.h	8.22 KB	-rw-r--r--	2025-03-04 13:53
mutex.h	3.44 KB	-rw-r--r--	2025-03-04 13:53
mutexblock.h	1.34 KB	-rw-r--r--	2025-03-04 13:53
net.h	10.32 KB	-rw-r--r--	2025-03-04 13:53
netaddr.h	4.56 KB	-rw-r--r--	2025-03-04 13:53
netdb.h	862 B	-rw-r--r--	2025-03-04 13:53
netscope.h	947 B	-rw-r--r--	2025-03-04 13:53
offset.h	699 B	-rw-r--r--	2025-03-04 13:53
once.h	981 B	-rw-r--r--	2025-03-04 13:53
ondestroy.h	2.79 KB	-rw-r--r--	2025-03-04 13:53
os.h	670 B	-rw-r--r--	2025-03-04 13:53
parseint.h	1.49 KB	-rw-r--r--	2025-03-04 13:53
platform.h	9.31 KB	-rw-r--r--	2025-03-04 13:53
pool.h	3.42 KB	-rw-r--r--	2025-03-04 13:53
portset.h	3.21 KB	-rw-r--r--	2025-03-04 13:53
print.h	2.49 KB	-rw-r--r--	2025-03-04 13:53
queue.h	4.66 KB	-rw-r--r--	2025-03-04 13:53
quota.h	2.29 KB	-rw-r--r--	2025-03-04 13:53
radix.h	6.37 KB	-rw-r--r--	2025-03-04 13:53
random.h	2.99 KB	-rw-r--r--	2025-03-04 13:53
ratelimiter.h	3.38 KB	-rw-r--r--	2025-03-04 13:53
refcount.h	7.89 KB	-rw-r--r--	2025-03-04 13:53
regex.h	766 B	-rw-r--r--	2025-03-04 13:53
region.h	1.99 KB	-rw-r--r--	2025-03-04 13:53
resource.h	2.8 KB	-rw-r--r--	2025-03-04 13:53
result.h	4.62 KB	-rw-r--r--	2025-03-04 13:53
resultclass.h	1.56 KB	-rw-r--r--	2025-03-04 13:53
rwlock.h	3.6 KB	-rw-r--r--	2025-03-04 13:53
safe.h	1.21 KB	-rw-r--r--	2025-03-04 13:53
serial.h	1.4 KB	-rw-r--r--	2025-03-04 13:53
sha1.h	1.52 KB	-rw-r--r--	2025-03-04 13:53
sha2.h	5.65 KB	-rw-r--r--	2025-03-04 13:53
sockaddr.h	6 KB	-rw-r--r--	2025-03-04 13:53
socket.h	35.81 KB	-rw-r--r--	2025-03-04 13:53
stat.h	805 B	-rw-r--r--	2025-03-04 13:53
stats.h	3.02 KB	-rw-r--r--	2025-03-04 13:53
stdio.h	1.74 KB	-rw-r--r--	2025-03-04 13:53
stdlib.h	703 B	-rw-r--r--	2025-03-04 13:53
stdtime.h	1.3 KB	-rw-r--r--	2025-03-04 13:53
strerror.h	776 B	-rw-r--r--	2025-03-04 13:53
string.h	5.94 KB	-rw-r--r--	2025-03-04 13:53
symtab.h	4.21 KB	-rw-r--r--	2025-03-04 13:53
syslog.h	843 B	-rw-r--r--	2025-03-04 13:53
task.h	21.08 KB	-rw-r--r--	2025-03-04 13:53
taskpool.h	3.61 KB	-rw-r--r--	2025-03-04 13:53
thread.h	1.47 KB	-rw-r--r--	2025-03-04 13:53
time.h	8.66 KB	-rw-r--r--	2025-03-04 13:53
timer.h	10.54 KB	-rw-r--r--	2025-03-04 13:53
tm.h	894 B	-rw-r--r--	2025-03-04 13:53
types.h	5.54 KB	-rw-r--r--	2025-03-04 13:53
util.h	7.49 KB	-rw-r--r--	2025-03-04 13:53
version.h	688 B	-rw-r--r--	2025-03-04 13:53
xml.h	1.07 KB	-rw-r--r--	2025-03-04 13:53

Rename

/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

#ifndef ISC_LFSR_H
#define ISC_LFSR_H 1

/*! \file isc/lfsr.h */

#include <isc/lang.h>
#include <isc/types.h>

typedef struct isc_lfsr isc_lfsr_t;

/*%
 * This function is called when reseeding is needed.  It is allowed to
 * modify any state in the LFSR in any way it sees fit OTHER THAN "bits".
 *
 * It MUST set "count" to a new value or the lfsr will never reseed again.
 *
 * Also, a reseed will never occur in the middle of an extraction.  This
 * is purely an optimization, and is probably what one would want.
 */
typedef void (*isc_lfsrreseed_t)(isc_lfsr_t *, void *);

/*%
 * The members of this structure can be used by the application, but care
 * needs to be taken to not change state once the lfsr is in operation.
 */
struct isc_lfsr {
	isc_uint32_t		state;	/*%< previous state */
	unsigned int		bits;	/*%< length */
	isc_uint32_t		tap;	/*%< bit taps */
	unsigned int		count;	/*%< reseed count (in BITS!) */
	isc_lfsrreseed_t	reseed;	/*%< reseed function */
	void		       *arg;	/*%< reseed function argument */
};

ISC_LANG_BEGINDECLS

void
isc_lfsr_init(isc_lfsr_t *lfsr, isc_uint32_t state, unsigned int bits,
		   isc_uint32_t tap, unsigned int count,
		   isc_lfsrreseed_t reseed, void *arg);
/*%<
 * Initialize an LFSR.
 *
 * Note:
 *
 *\li	Putting untrusted values into this function will cause the LFSR to
 *	generate (perhaps) non-maximal length sequences.
 *
 * Requires:
 *
 *\li	lfsr != NULL
 *
 *\li	8 <= bits <= 32
 *
 *\li	tap != 0
 */

void
isc_lfsr_generate(isc_lfsr_t *lfsr, void *data, unsigned int count);
/*%<
 * Returns "count" bytes of data from the LFSR.
 *
 * Requires:
 *
 *\li	lfsr be valid.
 *
 *\li	data != NULL.
 *
 *\li	count > 0.
 */

void
isc_lfsr_skip(isc_lfsr_t *lfsr, unsigned int skip);
/*%<
 * Skip "skip" states.
 *
 * Requires:
 *
 *\li	lfsr be valid.
 */

isc_uint32_t
isc_lfsr_generate32(isc_lfsr_t *lfsr1, isc_lfsr_t *lfsr2);
/*%<
 * Given two LFSRs, use the current state from each to skip entries in the
 * other.  The next states are then xor'd together and returned.
 *
 * WARNING:
 *
 *\li	This function is used only for very, very low security data, such
 *	as DNS message IDs where it is desired to have an unpredictable
 *	stream of bytes that are harder to predict than a simple flooding
 *	attack.
 *
 * Notes:
 *
 *\li	Since the current state from each of the LFSRs is used to skip
 *	state in the other, it is important that no state be leaked
 *	from either LFSR.
 *
 * Requires:
 *
 *\li	lfsr1 and lfsr2 be valid.
 *
 *\li	1 <= skipbits <= 31
 */

ISC_LANG_ENDDECLS

#endif /* ISC_LFSR_H */