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diff --git a/src/pluto/rnd.c b/src/pluto/rnd.c
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-/* randomness machinery
- * Copyright (C) 1997 Angelos D. Keromytis.
- * Copyright (C) 1998-2001 D. Hugh Redelmeier.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * for more details.
- *
- * RCSID $Id: rnd.c 3252 2007-10-06 21:24:50Z andreas $
- */
-
-/* A true random number generator (we hope)
- *
- * Under LINUX ("linux" predefined), use /dev/urandom.
- * Under OpenBSD ("__OpenBSD__" predefined), use arc4random().
- * Otherwise use our own random number generator based on clock skew.
- * I (ADK) first heard of the idea from John Ioannidis, who heard it
- * from Matt Blaze and/or Jack Lacy.
- * ??? Why is mixing need for linux but not OpenBSD?
- */
-
-/* Pluto's uses of randomness:
- *
- * - Setting up the "secret_of_the_day". This changes every hour! 20
- * bytes a shot. It is used in building responder cookies.
- *
- * - generating initiator cookies (8 bytes, once per Phase 1 initiation).
- *
- * - 32 bytes per DH local secret. Once per Main Mode exchange and once
- * per Quick Mode Exchange with PFS. (Size is our choice, with
- * tradeoffs.)
- *
- * - 16 bytes per nonce we generate. Once per Main Mode exchange and
- * once per Quick Mode exchange. (Again, we choose the size.)
- *
- * - 4 bytes per SPI number that we generate. We choose the SPIs for all
- * inbound SPIs, one to three per IPSEC SA (one for AH (rare, probably)
- * one for ESP (almost always), and one for tunnel (very common)).
- * I don't actually know how the kernel would generate these numbers --
- * currently Pluto generates them; this isn't the way things will be
- * done in the future.
- *
- * - 4 bytes per Message ID we need to generate. One per Quick Mode
- * exchange. Eventually, one per informational exchange.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <signal.h>
-#include <unistd.h>
-#include <errno.h>
-#include <sys/time.h>
-#include <fcntl.h>
-
-#include <freeswan.h>
-
-#include "sha1.h"
-#include "constants.h"
-#include "defs.h"
-#include "rnd.h"
-#include "log.h"
-#include "timer.h"
-
-#ifdef linux
-# define USE_DEV_RANDOM 1
-# define RANDOM_PATH DEV_URANDOM
-#else
-# ifdef __OpenBSD__
-# define USE_ARC4RANDOM
-# else
-# define USE_CLOCK_SLEW
-# endif
-#endif
-
-#ifdef USE_ARC4RANDOM
-
-#define get_rnd_byte() (arc4random() % 256)
-
-#else /**** start of large #else ****/
-
-#ifdef USE_DEV_RANDOM
-static int random_fd = NULL_FD;
-#endif
-
-#define RANDOM_POOL_SIZE SHA1_DIGEST_SIZE
-static u_char random_pool[RANDOM_POOL_SIZE];
-
-#ifdef USE_DEV_RANDOM
-
-/* Generate (what we hope is) a true random byte using /dev/urandom */
-static u_char
-generate_rnd_byte(void)
-{
- u_char c;
-
- if (read(random_fd, &c, sizeof(c)) == -1)
- exit_log_errno((e, "read() failed in get_rnd_byte()"));
-
- return c;
-}
-
-#else /* !USE_DEV_RANDOM */
-
-/* Generate (what we hope is) a true random byte using the clock skew trick.
- * Note: this code is not maintained! In particular, LINUX signal(2)
- * semantics changed with glibc2 (and not for the better). It isn't clear
- * that this code will work. We keep the code because someday it might
- * come in handy.
- */
-# error "This code is not maintained. Please define USE_DEV_RANDOM."
-
-static volatile sig_atomic_t i, j, k;
-
-/* timer signal handler */
-static void
-rnd_handler(int ignore_me UNUSED)
-{
- k <<= 1; /* Shift left by 1 */
- j++;
- k |= (i & 0x1); /* Get lsbit of counter */
-
- if (j != 8)
- signal(SIGVTALRM, rnd_handler);
-}
-
-static u_char
-generate_rnd_byte(void)
-{
- struct itimerval tmval, ntmval;
-
-# ifdef NEVER /* ??? */
-# ifdef linux
- int mask = siggetmask();
-
- mask |= SIGVTALRM;
- sigsetmask(mask);
-# endif
-# endif
-
- i = 0;
- j = 0;
-
- ntmval.it_interval.tv_sec = 0;
- ntmval.it_interval.tv_usec = 1;
- ntmval.it_value.tv_sec = 0;
- ntmval.it_value.tv_usec = 1;
- signal(SIGVTALRM, rnd_handler);
- setitimer(ITIMER_VIRTUAL, &ntmval, &tmval);
-
- while (j != 8)
- i++;
-
- setitimer(ITIMER_VIRTUAL, &tmval, &ntmval);
- signal(SIGVTALRM, SIG_IGN);
-
-# ifdef NEVER /* ??? */
-# ifdef linux
- mask ^= SIGVTALRM;
- sigsetmask(mask);
-# endif
-# endif
-
- return k;
-}
-
-#endif /* !USE_DEV_RANDOM */
-
-static void
-mix_pool(void)
-{
- SHA1_CTX ctx;
-
- SHA1Init(&ctx);
- SHA1Update(&ctx, random_pool, RANDOM_POOL_SIZE);
- SHA1Final(random_pool, &ctx);
-}
-
-/*
- * Get a single random byte.
- */
-static u_char
-get_rnd_byte(void)
-{
- random_pool[RANDOM_POOL_SIZE - 1] = generate_rnd_byte();
- random_pool[0] = generate_rnd_byte();
- mix_pool();
- return random_pool[0];
-}
-
-#endif /* !USE_ARC4RANDOM */ /**** end of large #else ****/
-
-void
-get_rnd_bytes(u_char *buffer, int length)
-{
- int i;
-
- for (i = 0; i < length; i++)
- buffer[i] = get_rnd_byte();
-}
-
-/*
- * Initialize the random pool.
- */
-void
-init_rnd_pool(void)
-{
-#ifndef USE_ARC4RANDOM
-# ifdef USE_DEV_RANDOM
- DBG(DBG_KLIPS, DBG_log("opening %s", RANDOM_PATH));
- random_fd = open(RANDOM_PATH, O_RDONLY);
- if (random_fd == -1)
- exit_log_errno((e, "open of %s failed in init_rnd_pool()", RANDOM_PATH));
- fcntl(random_fd, F_SETFD, FD_CLOEXEC);
-# endif
-
- get_rnd_bytes(random_pool, RANDOM_POOL_SIZE);
- mix_pool();
-#endif /* !USE_ARC4RANDOM */
-
- /* start of rand(3) on the right foot */
- {
- unsigned int seed;
-
- get_rnd_bytes((void *)&seed, sizeof(seed));
- srand(seed);
- }
-}
-
-u_char secret_of_the_day[SHA1_DIGEST_SIZE];
-
-#ifndef NO_PLUTO
-
-void
-init_secret(void)
-{
- /*
- * Generate the secret value for responder cookies, and
- * schedule an event for refresh.
- */
- get_rnd_bytes(secret_of_the_day, sizeof(secret_of_the_day));
- event_schedule(EVENT_REINIT_SECRET, EVENT_REINIT_SECRET_DELAY, NULL);
-}
-
-#endif /* NO_PLUTO */
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