зеркало из https://github.com/Azure/sonic-openssh.git
- (djm) [openbsd-compat/arc4random.c openbsd-compat/chacha_private.h] Pull
in OpenBSD implementation of arc4random, shortly to replace the existing bsd-arc4random.c
This commit is contained in:
Damien Miller
Родитель
67f1d557a6
Коммит
9159310087
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@ -1,3 +1,8 @@
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20131009
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- (djm) [openbsd-compat/arc4random.c openbsd-compat/chacha_private.h] Pull
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in OpenBSD implementation of arc4random, shortly to replace the existing
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bsd-arc4random.c
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20130922
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- (dtucker) [platform.c platform.h sshd.c] bz#2156: restore Linux oom_adj
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setting when handling SIGHUP to maintain behaviour over retart. Patch
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@ -0,0 +1,261 @@
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/* $OpenBSD: arc4random.c,v 1.25 2013/10/01 18:34:57 markus Exp $ */
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/*
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* Copyright (c) 1996, David Mazieres <dm@uun.org>
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* Copyright (c) 2008, Damien Miller <djm@openbsd.org>
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* Copyright (c) 2013, Markus Friedl <markus@openbsd.org>
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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 THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* ChaCha based random number generator for OpenBSD.
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*/
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#include <fcntl.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/sysctl.h>
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#include "thread_private.h"
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#define KEYSTREAM_ONLY
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#include "chacha_private.h"
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#ifdef __GNUC__
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#define inline __inline
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#else /* !__GNUC__ */
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#define inline
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#endif /* !__GNUC__ */
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#define KEYSZ 32
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#define IVSZ 8
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#define BLOCKSZ 64
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#define RSBUFSZ (16*BLOCKSZ)
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static int rs_initialized;
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static pid_t rs_stir_pid;
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static chacha_ctx rs; /* chacha context for random keystream */
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static u_char rs_buf[RSBUFSZ]; /* keystream blocks */
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static size_t rs_have; /* valid bytes at end of rs_buf */
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static size_t rs_count; /* bytes till reseed */
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static inline void _rs_rekey(u_char *dat, size_t datlen);
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static inline void
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_rs_init(u_char *buf, size_t n)
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{
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if (n < KEYSZ + IVSZ)
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return;
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chacha_keysetup(&rs, buf, KEYSZ * 8, 0);
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chacha_ivsetup(&rs, buf + KEYSZ);
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}
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static void
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_rs_stir(void)
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{
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int mib[2];
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size_t len;
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u_char rnd[KEYSZ + IVSZ];
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mib[0] = CTL_KERN;
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mib[1] = KERN_ARND;
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len = sizeof(rnd);
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sysctl(mib, 2, rnd, &len, NULL, 0);
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if (!rs_initialized) {
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rs_initialized = 1;
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_rs_init(rnd, sizeof(rnd));
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} else
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_rs_rekey(rnd, sizeof(rnd));
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memset(rnd, 0, sizeof(rnd));
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/* invalidate rs_buf */
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rs_have = 0;
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memset(rs_buf, 0, RSBUFSZ);
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rs_count = 1600000;
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}
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static inline void
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_rs_stir_if_needed(size_t len)
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{
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pid_t pid = getpid();
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if (rs_count <= len || !rs_initialized || rs_stir_pid != pid) {
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rs_stir_pid = pid;
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_rs_stir();
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} else
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rs_count -= len;
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}
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static inline void
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_rs_rekey(u_char *dat, size_t datlen)
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{
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#ifndef KEYSTREAM_ONLY
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memset(rs_buf, 0,RSBUFSZ);
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#endif
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/* fill rs_buf with the keystream */
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chacha_encrypt_bytes(&rs, rs_buf, rs_buf, RSBUFSZ);
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/* mix in optional user provided data */
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if (dat) {
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size_t i, m;
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m = MIN(datlen, KEYSZ + IVSZ);
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for (i = 0; i < m; i++)
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rs_buf[i] ^= dat[i];
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}
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/* immediately reinit for backtracking resistance */
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_rs_init(rs_buf, KEYSZ + IVSZ);
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memset(rs_buf, 0, KEYSZ + IVSZ);
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rs_have = RSBUFSZ - KEYSZ - IVSZ;
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}
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static inline void
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_rs_random_buf(void *_buf, size_t n)
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{
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u_char *buf = (u_char *)_buf;
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size_t m;
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_rs_stir_if_needed(n);
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while (n > 0) {
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if (rs_have > 0) {
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m = MIN(n, rs_have);
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memcpy(buf, rs_buf + RSBUFSZ - rs_have, m);
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memset(rs_buf + RSBUFSZ - rs_have, 0, m);
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buf += m;
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n -= m;
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rs_have -= m;
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}
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if (rs_have == 0)
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_rs_rekey(NULL, 0);
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}
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}
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static inline void
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_rs_random_u32(u_int32_t *val)
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{
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_rs_stir_if_needed(sizeof(*val));
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if (rs_have < sizeof(*val))
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_rs_rekey(NULL, 0);
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memcpy(val, rs_buf + RSBUFSZ - rs_have, sizeof(*val));
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memset(rs_buf + RSBUFSZ - rs_have, 0, sizeof(*val));
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rs_have -= sizeof(*val);
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return;
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}
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void
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arc4random_stir(void)
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{
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_ARC4_LOCK();
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_rs_stir();
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_ARC4_UNLOCK();
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}
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void
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arc4random_addrandom(u_char *dat, int datlen)
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{
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int m;
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_ARC4_LOCK();
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if (!rs_initialized)
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_rs_stir();
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while (datlen > 0) {
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m = MIN(datlen, KEYSZ + IVSZ);
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_rs_rekey(dat, m);
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dat += m;
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datlen -= m;
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}
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_ARC4_UNLOCK();
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}
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u_int32_t
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arc4random(void)
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{
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u_int32_t val;
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_ARC4_LOCK();
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_rs_random_u32(&val);
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_ARC4_UNLOCK();
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return val;
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}
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void
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arc4random_buf(void *buf, size_t n)
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{
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_ARC4_LOCK();
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_rs_random_buf(buf, n);
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_ARC4_UNLOCK();
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}
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/*
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* Calculate a uniformly distributed random number less than upper_bound
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* avoiding "modulo bias".
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*
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* Uniformity is achieved by generating new random numbers until the one
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* returned is outside the range [0, 2**32 % upper_bound). This
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* guarantees the selected random number will be inside
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* [2**32 % upper_bound, 2**32) which maps back to [0, upper_bound)
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* after reduction modulo upper_bound.
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*/
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u_int32_t
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arc4random_uniform(u_int32_t upper_bound)
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{
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u_int32_t r, min;
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if (upper_bound < 2)
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return 0;
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/* 2**32 % x == (2**32 - x) % x */
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min = -upper_bound % upper_bound;
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/*
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* This could theoretically loop forever but each retry has
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* p > 0.5 (worst case, usually far better) of selecting a
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* number inside the range we need, so it should rarely need
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* to re-roll.
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*/
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for (;;) {
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r = arc4random();
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if (r >= min)
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break;
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}
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return r % upper_bound;
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}
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#if 0
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/*-------- Test code for i386 --------*/
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#include <stdio.h>
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#include <machine/pctr.h>
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int
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main(int argc, char **argv)
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{
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const int iter = 1000000;
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int i;
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pctrval v;
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v = rdtsc();
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for (i = 0; i < iter; i++)
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arc4random();
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v = rdtsc() - v;
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v /= iter;
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printf("%qd cycles\n", v);
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exit(0);
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}
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#endif
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@ -0,0 +1,222 @@
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/*
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chacha-merged.c version 20080118
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D. J. Bernstein
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Public domain.
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*/
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/* $OpenBSD: chacha_private.h,v 1.2 2013/10/04 07:02:27 djm Exp $ */
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typedef unsigned char u8;
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typedef unsigned int u32;
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typedef struct
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{
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u32 input[16]; /* could be compressed */
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} chacha_ctx;
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#define U8C(v) (v##U)
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#define U32C(v) (v##U)
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#define U8V(v) ((u8)(v) & U8C(0xFF))
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#define U32V(v) ((u32)(v) & U32C(0xFFFFFFFF))
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#define ROTL32(v, n) \
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(U32V((v) << (n)) | ((v) >> (32 - (n))))
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#define U8TO32_LITTLE(p) \
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(((u32)((p)[0]) ) | \
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((u32)((p)[1]) << 8) | \
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((u32)((p)[2]) << 16) | \
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((u32)((p)[3]) << 24))
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#define U32TO8_LITTLE(p, v) \
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do { \
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(p)[0] = U8V((v) ); \
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(p)[1] = U8V((v) >> 8); \
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(p)[2] = U8V((v) >> 16); \
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(p)[3] = U8V((v) >> 24); \
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} while (0)
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#define ROTATE(v,c) (ROTL32(v,c))
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#define XOR(v,w) ((v) ^ (w))
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#define PLUS(v,w) (U32V((v) + (w)))
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#define PLUSONE(v) (PLUS((v),1))
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#define QUARTERROUND(a,b,c,d) \
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a = PLUS(a,b); d = ROTATE(XOR(d,a),16); \
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c = PLUS(c,d); b = ROTATE(XOR(b,c),12); \
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a = PLUS(a,b); d = ROTATE(XOR(d,a), 8); \
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c = PLUS(c,d); b = ROTATE(XOR(b,c), 7);
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static const char sigma[16] = "expand 32-byte k";
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static const char tau[16] = "expand 16-byte k";
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static void
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chacha_keysetup(chacha_ctx *x,const u8 *k,u32 kbits,u32 ivbits)
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{
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const char *constants;
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x->input[4] = U8TO32_LITTLE(k + 0);
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x->input[5] = U8TO32_LITTLE(k + 4);
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x->input[6] = U8TO32_LITTLE(k + 8);
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x->input[7] = U8TO32_LITTLE(k + 12);
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if (kbits == 256) { /* recommended */
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k += 16;
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constants = sigma;
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} else { /* kbits == 128 */
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constants = tau;
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}
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x->input[8] = U8TO32_LITTLE(k + 0);
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x->input[9] = U8TO32_LITTLE(k + 4);
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x->input[10] = U8TO32_LITTLE(k + 8);
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x->input[11] = U8TO32_LITTLE(k + 12);
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x->input[0] = U8TO32_LITTLE(constants + 0);
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x->input[1] = U8TO32_LITTLE(constants + 4);
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x->input[2] = U8TO32_LITTLE(constants + 8);
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x->input[3] = U8TO32_LITTLE(constants + 12);
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}
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static void
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chacha_ivsetup(chacha_ctx *x,const u8 *iv)
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{
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x->input[12] = 0;
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x->input[13] = 0;
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x->input[14] = U8TO32_LITTLE(iv + 0);
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x->input[15] = U8TO32_LITTLE(iv + 4);
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}
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static void
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chacha_encrypt_bytes(chacha_ctx *x,const u8 *m,u8 *c,u32 bytes)
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{
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u32 x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15;
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u32 j0, j1, j2, j3, j4, j5, j6, j7, j8, j9, j10, j11, j12, j13, j14, j15;
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u8 *ctarget = NULL;
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u8 tmp[64];
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u_int i;
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if (!bytes) return;
|
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j0 = x->input[0];
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j1 = x->input[1];
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j2 = x->input[2];
|
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j3 = x->input[3];
|
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j4 = x->input[4];
|
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j5 = x->input[5];
|
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j6 = x->input[6];
|
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j7 = x->input[7];
|
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j8 = x->input[8];
|
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j9 = x->input[9];
|
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j10 = x->input[10];
|
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j11 = x->input[11];
|
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j12 = x->input[12];
|
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j13 = x->input[13];
|
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j14 = x->input[14];
|
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j15 = x->input[15];
|
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|
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for (;;) {
|
||||
if (bytes < 64) {
|
||||
for (i = 0;i < bytes;++i) tmp[i] = m[i];
|
||||
m = tmp;
|
||||
ctarget = c;
|
||||
c = tmp;
|
||||
}
|
||||
x0 = j0;
|
||||
x1 = j1;
|
||||
x2 = j2;
|
||||
x3 = j3;
|
||||
x4 = j4;
|
||||
x5 = j5;
|
||||
x6 = j6;
|
||||
x7 = j7;
|
||||
x8 = j8;
|
||||
x9 = j9;
|
||||
x10 = j10;
|
||||
x11 = j11;
|
||||
x12 = j12;
|
||||
x13 = j13;
|
||||
x14 = j14;
|
||||
x15 = j15;
|
||||
for (i = 20;i > 0;i -= 2) {
|
||||
QUARTERROUND( x0, x4, x8,x12)
|
||||
QUARTERROUND( x1, x5, x9,x13)
|
||||
QUARTERROUND( x2, x6,x10,x14)
|
||||
QUARTERROUND( x3, x7,x11,x15)
|
||||
QUARTERROUND( x0, x5,x10,x15)
|
||||
QUARTERROUND( x1, x6,x11,x12)
|
||||
QUARTERROUND( x2, x7, x8,x13)
|
||||
QUARTERROUND( x3, x4, x9,x14)
|
||||
}
|
||||
x0 = PLUS(x0,j0);
|
||||
x1 = PLUS(x1,j1);
|
||||
x2 = PLUS(x2,j2);
|
||||
x3 = PLUS(x3,j3);
|
||||
x4 = PLUS(x4,j4);
|
||||
x5 = PLUS(x5,j5);
|
||||
x6 = PLUS(x6,j6);
|
||||
x7 = PLUS(x7,j7);
|
||||
x8 = PLUS(x8,j8);
|
||||
x9 = PLUS(x9,j9);
|
||||
x10 = PLUS(x10,j10);
|
||||
x11 = PLUS(x11,j11);
|
||||
x12 = PLUS(x12,j12);
|
||||
x13 = PLUS(x13,j13);
|
||||
x14 = PLUS(x14,j14);
|
||||
x15 = PLUS(x15,j15);
|
||||
|
||||
#ifndef KEYSTREAM_ONLY
|
||||
x0 = XOR(x0,U8TO32_LITTLE(m + 0));
|
||||
x1 = XOR(x1,U8TO32_LITTLE(m + 4));
|
||||
x2 = XOR(x2,U8TO32_LITTLE(m + 8));
|
||||
x3 = XOR(x3,U8TO32_LITTLE(m + 12));
|
||||
x4 = XOR(x4,U8TO32_LITTLE(m + 16));
|
||||
x5 = XOR(x5,U8TO32_LITTLE(m + 20));
|
||||
x6 = XOR(x6,U8TO32_LITTLE(m + 24));
|
||||
x7 = XOR(x7,U8TO32_LITTLE(m + 28));
|
||||
x8 = XOR(x8,U8TO32_LITTLE(m + 32));
|
||||
x9 = XOR(x9,U8TO32_LITTLE(m + 36));
|
||||
x10 = XOR(x10,U8TO32_LITTLE(m + 40));
|
||||
x11 = XOR(x11,U8TO32_LITTLE(m + 44));
|
||||
x12 = XOR(x12,U8TO32_LITTLE(m + 48));
|
||||
x13 = XOR(x13,U8TO32_LITTLE(m + 52));
|
||||
x14 = XOR(x14,U8TO32_LITTLE(m + 56));
|
||||
x15 = XOR(x15,U8TO32_LITTLE(m + 60));
|
||||
#endif
|
||||
|
||||
j12 = PLUSONE(j12);
|
||||
if (!j12) {
|
||||
j13 = PLUSONE(j13);
|
||||
/* stopping at 2^70 bytes per nonce is user's responsibility */
|
||||
}
|
||||
|
||||
U32TO8_LITTLE(c + 0,x0);
|
||||
U32TO8_LITTLE(c + 4,x1);
|
||||
U32TO8_LITTLE(c + 8,x2);
|
||||
U32TO8_LITTLE(c + 12,x3);
|
||||
U32TO8_LITTLE(c + 16,x4);
|
||||
U32TO8_LITTLE(c + 20,x5);
|
||||
U32TO8_LITTLE(c + 24,x6);
|
||||
U32TO8_LITTLE(c + 28,x7);
|
||||
U32TO8_LITTLE(c + 32,x8);
|
||||
U32TO8_LITTLE(c + 36,x9);
|
||||
U32TO8_LITTLE(c + 40,x10);
|
||||
U32TO8_LITTLE(c + 44,x11);
|
||||
U32TO8_LITTLE(c + 48,x12);
|
||||
U32TO8_LITTLE(c + 52,x13);
|
||||
U32TO8_LITTLE(c + 56,x14);
|
||||
U32TO8_LITTLE(c + 60,x15);
|
||||
|
||||
if (bytes <= 64) {
|
||||
if (bytes < 64) {
|
||||
for (i = 0;i < bytes;++i) ctarget[i] = c[i];
|
||||
}
|
||||
x->input[12] = j12;
|
||||
x->input[13] = j13;
|
||||
return;
|
||||
}
|
||||
bytes -= 64;
|
||||
c += 64;
|
||||
#ifndef KEYSTREAM_ONLY
|
||||
m += 64;
|
||||
#endif
|
||||
}
|
||||
}
|
||||
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