-/* crypto/rand/rand_unix.c */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
+/*
+ * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
*
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
*/
-/* ====================================================================
- * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. All advertising materials mentioning features or use of this
- * software must display the following acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
- *
- * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
- * endorse or promote products derived from this software without
- * prior written permission. For written permission, please contact
- * openssl-core@openssl.org.
+
+#define _GNU_SOURCE
+#include "e_os.h"
+#include <stdio.h>
+#include "internal/cryptlib.h"
+#include <openssl/rand.h>
+#include "rand_lcl.h"
+#include "internal/rand_int.h"
+#include <stdio.h>
+#include "internal/dso.h"
+#if defined(__linux)
+# include <sys/syscall.h>
+#endif
+#if defined(__FreeBSD__)
+# include <sys/types.h>
+# include <sys/sysctl.h>
+# include <sys/param.h>
+#endif
+#if defined(__OpenBSD__) || defined(__NetBSD__)
+# include <sys/param.h>
+#endif
+#ifdef OPENSSL_SYS_UNIX
+# include <sys/types.h>
+# include <unistd.h>
+# include <sys/time.h>
+
+static uint64_t get_time_stamp(void);
+static uint64_t get_timer_bits(void);
+
+/* Macro to convert two thirty two bit values into a sixty four bit one */
+# define TWO32TO64(a, b) ((((uint64_t)(a)) << 32) + (b))
+
+/*
+ * Check for the existence and support of POSIX timers. The standard
+ * says that the _POSIX_TIMERS macro will have a positive value if they
+ * are available.
*
- * 5. Products derived from this software may not be called "OpenSSL"
- * nor may "OpenSSL" appear in their names without prior written
- * permission of the OpenSSL Project.
+ * However, we want an additional constraint: that the timer support does
+ * not require an extra library dependency. Early versions of glibc
+ * require -lrt to be specified on the link line to access the timers,
+ * so this needs to be checked for.
*
- * 6. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+ * It is worse because some libraries define __GLIBC__ but don't
+ * support the version testing macro (e.g. uClibc). This means
+ * an extra check is needed.
*
- * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
- * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- * ====================================================================
+ * The final condition is:
+ * "have posix timers and either not glibc or glibc without -lrt"
*
- * This product includes cryptographic software written by Eric Young
- * (eay@cryptsoft.com). This product includes software written by Tim
- * Hudson (tjh@cryptsoft.com).
+ * The nested #if sequences are required to avoid using a parameterised
+ * macro that might be undefined.
+ */
+# undef OSSL_POSIX_TIMER_OKAY
+# if defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0
+# if defined(__GLIBC__)
+# if defined(__GLIBC_PREREQ)
+# if __GLIBC_PREREQ(2, 17)
+# define OSSL_POSIX_TIMER_OKAY
+# endif
+# endif
+# else
+# define OSSL_POSIX_TIMER_OKAY
+# endif
+# endif
+#endif
+
+int syscall_random(void *buf, size_t buflen);
+
+#if (defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_UEFI)) && \
+ !defined(OPENSSL_RAND_SEED_NONE)
+# error "UEFI and VXWorks only support seeding NONE"
+#endif
+
+#if !(defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) \
+ || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_VXWORKS) \
+ || defined(OPENSSL_SYS_UEFI))
+
+# if defined(OPENSSL_SYS_VOS)
+
+# ifndef OPENSSL_RAND_SEED_OS
+# error "Unsupported seeding method configured; must be os"
+# endif
+
+# if defined(OPENSSL_SYS_VOS_HPPA) && defined(OPENSSL_SYS_VOS_IA32)
+# error "Unsupported HP-PA and IA32 at the same time."
+# endif
+# if !defined(OPENSSL_SYS_VOS_HPPA) && !defined(OPENSSL_SYS_VOS_IA32)
+# error "Must have one of HP-PA or IA32"
+# endif
+
+/*
+ * The following algorithm repeatedly samples the real-time clock (RTC) to
+ * generate a sequence of unpredictable data. The algorithm relies upon the
+ * uneven execution speed of the code (due to factors such as cache misses,
+ * interrupts, bus activity, and scheduling) and upon the rather large
+ * relative difference between the speed of the clock and the rate at which
+ * it can be read. If it is ported to an environment where execution speed
+ * is more constant or where the RTC ticks at a much slower rate, or the
+ * clock can be read with fewer instructions, it is likely that the results
+ * would be far more predictable. This should only be used for legacy
+ * platforms.
*
+ * As a precaution, we assume only 2 bits of entropy per byte.
*/
-#include <stdio.h>
+size_t rand_pool_acquire_entropy(RAND_POOL *pool)
+{
+ short int code;
+ int i, k;
+ size_t bytes_needed;
+ struct timespec ts;
+ unsigned char v;
+# ifdef OPENSSL_SYS_VOS_HPPA
+ long duration;
+ extern void s$sleep(long *_duration, short int *_code);
+# else
+ long long duration;
+ extern void s$sleep2(long long *_duration, short int *_code);
+# endif
-#define USE_SOCKETS
-#include "e_os.h"
-#include "cryptlib.h"
-#include <openssl/rand.h>
-#include "rand_lcl.h"
+ bytes_needed = rand_pool_bytes_needed(pool, 4 /*entropy_factor*/);
+
+ for (i = 0; i < bytes_needed; i++) {
+ /*
+ * burn some cpu; hope for interrupts, cache collisions, bus
+ * interference, etc.
+ */
+ for (k = 0; k < 99; k++)
+ ts.tv_nsec = random();
+
+# ifdef OPENSSL_SYS_VOS_HPPA
+ /* sleep for 1/1024 of a second (976 us). */
+ duration = 1;
+ s$sleep(&duration, &code);
+# else
+ /* sleep for 1/65536 of a second (15 us). */
+ duration = 1;
+ s$sleep2(&duration, &code);
+# endif
+
+ /* Get wall clock time, take 8 bits. */
+ clock_gettime(CLOCK_REALTIME, &ts);
+ v = (unsigned char)(ts.tv_nsec & 0xFF);
+ rand_pool_add(pool, arg, &v, sizeof(v) , 2);
+ }
+ return rand_pool_entropy_available(pool);
+}
+
+# else
+
+# if defined(OPENSSL_RAND_SEED_EGD) && \
+ (defined(OPENSSL_NO_EGD) || !defined(DEVRANDOM_EGD))
+# error "Seeding uses EGD but EGD is turned off or no device given"
+# endif
+
+# if defined(OPENSSL_RAND_SEED_DEVRANDOM) && !defined(DEVRANDOM)
+# error "Seeding uses urandom but DEVRANDOM is not configured"
+# endif
+
+# if defined(__GLIBC__) && defined(__GLIBC_PREREQ)
+# if __GLIBC_PREREQ(2, 25)
+# define OPENSSL_HAVE_GETRANDOM
+# endif
+# endif
-#if !(defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_OS2) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_NETWARE))
+# if (defined(__FreeBSD__) && __FreeBSD_version >= 1200061)
+# define OPENSSL_HAVE_GETRANDOM
+# endif
-#include <sys/types.h>
-#include <sys/time.h>
-#include <sys/times.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <time.h>
+# if defined(OPENSSL_HAVE_GETRANDOM)
+# include <sys/random.h>
+# endif
-int RAND_poll(void)
+# if defined(OPENSSL_RAND_SEED_OS)
+# if !defined(DEVRANDOM)
+# error "OS seeding requires DEVRANDOM to be configured"
+# endif
+# define OPENSSL_RAND_SEED_GETRANDOM
+# define OPENSSL_RAND_SEED_DEVRANDOM
+# endif
+
+# if defined(OPENSSL_RAND_SEED_LIBRANDOM)
+# error "librandom not (yet) supported"
+# endif
+
+# if (defined(__FreeBSD__) || defined(__NetBSD__)) && defined(KERN_ARND)
+/*
+ * sysctl_random(): Use sysctl() to read a random number from the kernel
+ * Returns the size on success, 0 on failure.
+ */
+static size_t sysctl_random(char *buf, size_t buflen)
{
- unsigned long l;
- pid_t curr_pid = getpid();
-#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
- unsigned char tmpbuf[ENTROPY_NEEDED];
- int n = 0;
-#endif
-#ifdef DEVRANDOM
- static const char *randomfiles[] = { DEVRANDOM, NULL };
- const char **randomfile = NULL;
- int fd;
-#endif
-#ifdef DEVRANDOM_EGD
- static const char *egdsockets[] = { DEVRANDOM_EGD, NULL };
- const char **egdsocket = NULL;
-#endif
+ int mib[2];
+ size_t done = 0;
+ size_t len;
-#ifdef DEVRANDOM
- /* Use a random entropy pool device. Linux, FreeBSD and OpenBSD
- * have this. Use /dev/urandom if you can as /dev/random may block
- * if it runs out of random entries. */
-
- for (randomfile = randomfiles; *randomfile && n < ENTROPY_NEEDED; randomfile++)
- {
- if ((fd = open(*randomfile, O_RDONLY|O_NONBLOCK
-#ifdef O_NOCTTY /* If it happens to be a TTY (god forbid), do not make it
- our controlling tty */
- |O_NOCTTY
-#endif
-#ifdef O_NOFOLLOW /* Fail if the file is a symbolic link */
- |O_NOFOLLOW
-#endif
- )) >= 0)
- {
- struct timeval t = { 0, 10*1000 }; /* Spend 10ms on
- each file. */
- int r;
- fd_set fset;
-
- do
- {
- FD_ZERO(&fset);
- FD_SET(fd, &fset);
- r = -1;
-
- if (select(fd+1,&fset,NULL,NULL,&t) < 0)
- t.tv_usec=0;
- else if (FD_ISSET(fd, &fset))
- {
- r=read(fd,(unsigned char *)tmpbuf+n,
- ENTROPY_NEEDED-n);
- if (r > 0)
- n += r;
- }
-
- /* Some Unixen will update t, some
- won't. For those who won't, give
- up here, otherwise, we will do
- this once again for the remaining
- time. */
- if (t.tv_usec == 10*1000)
- t.tv_usec=0;
- }
- while ((r > 0 || (errno == EINTR || errno == EAGAIN))
- && t.tv_usec != 0 && n < ENTROPY_NEEDED);
-
- close(fd);
- }
- }
+ /*
+ * On FreeBSD old implementations returned longs, newer versions support
+ * variable sizes up to 256 byte. The code below would not work properly
+ * when the sysctl returns long and we want to request something not a
+ * multiple of longs, which should never be the case.
+ */
+ if (!ossl_assert(buflen % sizeof(long) == 0))
+ return 0;
+
+ /*
+ * On NetBSD before 4.0 KERN_ARND was an alias for KERN_URND, and only
+ * filled in an int, leaving the rest uninitialized. Since NetBSD 4.0
+ * it returns a variable number of bytes with the current version supporting
+ * up to 256 bytes.
+ * Just return an error on older NetBSD versions.
+ */
+#if defined(__NetBSD__) && __NetBSD_Version__ < 400000000
+ return 0;
#endif
-#ifdef DEVRANDOM_EGD
- /* Use an EGD socket to read entropy from an EGD or PRNGD entropy
- * collecting daemon. */
+ mib[0] = CTL_KERN;
+ mib[1] = KERN_ARND;
- for (egdsocket = egdsockets; *egdsocket && n < ENTROPY_NEEDED; egdsocket++)
- {
- int r;
+ do {
+ len = buflen;
+ if (sysctl(mib, 2, buf, &len, NULL, 0) == -1)
+ return done;
+ done += len;
+ buf += len;
+ buflen -= len;
+ } while (buflen > 0);
- r = RAND_query_egd_bytes(*egdsocket, (unsigned char *)tmpbuf+n,
- ENTROPY_NEEDED-n);
- if (r > 0)
- n += r;
- }
-#endif
+ return done;
+}
+# endif
-#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
- if (n > 0)
- {
- RAND_add(tmpbuf,sizeof tmpbuf,n);
- OPENSSL_cleanse(tmpbuf,n);
- }
-#endif
+/*
+ * syscall_random(): Try to get random data using a system call
+ * returns the number of bytes returned in buf, or <= 0 on error.
+ */
+int syscall_random(void *buf, size_t buflen)
+{
+ union {
+ void *p;
+ int (*f)(void *buffer, size_t length);
+ } p_getentropy;
- /* put in some default random data, we need more than just this */
- l=curr_pid;
- RAND_add(&l,sizeof(l),0);
- l=getuid();
- RAND_add(&l,sizeof(l),0);
+ /*
+ * Do runtime detection to find getentropy().
+ *
+ * We could cache the result of the lookup, but we normally don't
+ * call this function often.
+ *
+ * Known OSs that should support this:
+ * - Darwin since 16 (OSX 10.12, IOS 10.0).
+ * - Solaris since 11.3
+ * - OpenBSD since 5.6
+ * - Linux since 3.17 with glibc 2.25
+ * - FreeBSD since 12.0 (1200061)
+ */
+ p_getentropy.p = DSO_global_lookup("getentropy");
+ if (p_getentropy.p != NULL)
+ return p_getentropy.f(buf, buflen);
- l=time(NULL);
- RAND_add(&l,sizeof(l),0);
+# if defined(OPENSSL_HAVE_GETRANDOM)
+ return (int)getrandom(buf, buflen, 0);
+# endif
-#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
- return 1;
-#else
- return 0;
-#endif
+ /* Linux supports this since version 3.17 */
+# if defined(__linux) && defined(SYS_getrandom)
+ return (int)syscall(SYS_getrandom, buf, buflen, 0);
+# endif
+
+# if (defined(__FreeBSD__) || defined(__NetBSD__)) && defined(KERN_ARND)
+ return (int)sysctl_random(buf, buflen);
+# endif
+
+ return -1;
}
+/*
+ * Try the various seeding methods in turn, exit when successful.
+ *
+ * TODO(DRBG): If more than one entropy source is available, is it
+ * preferable to stop as soon as enough entropy has been collected
+ * (as favored by @rsalz) or should one rather be defensive and add
+ * more entropy than requested and/or from different sources?
+ *
+ * Currently, the user can select multiple entropy sources in the
+ * configure step, yet in practice only the first available source
+ * will be used. A more flexible solution has been requested, but
+ * currently it is not clear how this can be achieved without
+ * overengineering the problem. There are many parameters which
+ * could be taken into account when selecting the order and amount
+ * of input from the different entropy sources (trust, quality,
+ * possibility of blocking).
+ */
+size_t rand_pool_acquire_entropy(RAND_POOL *pool)
+{
+# ifdef OPENSSL_RAND_SEED_NONE
+ return rand_pool_entropy_available(pool);
+# else
+ size_t bytes_needed;
+ size_t entropy_available = 0;
+ unsigned char *buffer;
+
+# ifdef OPENSSL_RAND_SEED_GETRANDOM
+ bytes_needed = rand_pool_bytes_needed(pool, 1 /*entropy_factor*/);
+ buffer = rand_pool_add_begin(pool, bytes_needed);
+ if (buffer != NULL) {
+ size_t bytes = 0;
+
+ if (syscall_random(buffer, bytes_needed) == (int)bytes_needed)
+ bytes = bytes_needed;
+
+ rand_pool_add_end(pool, bytes, 8 * bytes);
+ entropy_available = rand_pool_entropy_available(pool);
+ }
+ if (entropy_available > 0)
+ return entropy_available;
+# endif
+
+# if defined(OPENSSL_RAND_SEED_LIBRANDOM)
+ {
+ /* Not yet implemented. */
+ }
+# endif
+
+# ifdef OPENSSL_RAND_SEED_DEVRANDOM
+ bytes_needed = rand_pool_bytes_needed(pool, 1 /*entropy_factor*/);
+ if (bytes_needed > 0) {
+ static const char *paths[] = { DEVRANDOM, NULL };
+ FILE *fp;
+ int i;
+
+ for (i = 0; paths[i] != NULL; i++) {
+ if ((fp = fopen(paths[i], "rb")) == NULL)
+ continue;
+ setbuf(fp, NULL);
+ buffer = rand_pool_add_begin(pool, bytes_needed);
+ if (buffer != NULL) {
+ size_t bytes = 0;
+ if (fread(buffer, 1, bytes_needed, fp) == bytes_needed)
+ bytes = bytes_needed;
+
+ rand_pool_add_end(pool, bytes, 8 * bytes);
+ entropy_available = rand_pool_entropy_available(pool);
+ }
+ fclose(fp);
+ if (entropy_available > 0)
+ return entropy_available;
+
+ bytes_needed = rand_pool_bytes_needed(pool, 1 /*entropy_factor*/);
+ }
+ }
+# endif
+
+# ifdef OPENSSL_RAND_SEED_RDTSC
+ entropy_available = rand_acquire_entropy_from_tsc(pool);
+ if (entropy_available > 0)
+ return entropy_available;
+# endif
+
+# ifdef OPENSSL_RAND_SEED_RDCPU
+ entropy_available = rand_acquire_entropy_from_cpu(pool);
+ if (entropy_available > 0)
+ return entropy_available;
+# endif
+
+# ifdef OPENSSL_RAND_SEED_EGD
+ bytes_needed = rand_pool_bytes_needed(pool, 1 /*entropy_factor*/);
+ if (bytes_needed > 0) {
+ static const char *paths[] = { DEVRANDOM_EGD, NULL };
+ int i;
+
+ for (i = 0; paths[i] != NULL; i++) {
+ buffer = rand_pool_add_begin(pool, bytes_needed);
+ if (buffer != NULL) {
+ size_t bytes = 0;
+ int num = RAND_query_egd_bytes(paths[i],
+ buffer, (int)bytes_needed);
+ if (num == (int)bytes_needed)
+ bytes = bytes_needed;
+
+ rand_pool_add_end(pool, bytes, 8 * bytes);
+ entropy_available = rand_pool_entropy_available(pool);
+ }
+ if (entropy_available > 0)
+ return entropy_available;
+ }
+ }
+# endif
+
+ return rand_pool_entropy_available(pool);
+# endif
+}
+# endif
#endif
-#if defined(OPENSSL_SYS_VXWORKS)
-int RAND_poll(void)
+#ifdef OPENSSL_SYS_UNIX
+int rand_pool_add_nonce_data(RAND_POOL *pool)
{
- return 0;
+ struct {
+ pid_t pid;
+ CRYPTO_THREAD_ID tid;
+ uint64_t time;
+ } data = { 0 };
+
+ /*
+ * Add process id, thread id, and a high resolution timestamp to
+ * ensure that the nonce is unique whith high probability for
+ * different process instances.
+ */
+ data.pid = getpid();
+ data.tid = CRYPTO_THREAD_get_current_id();
+ data.time = get_time_stamp();
+
+ return rand_pool_add(pool, (unsigned char *)&data, sizeof(data), 0);
+}
+
+int rand_pool_add_additional_data(RAND_POOL *pool)
+{
+ struct {
+ CRYPTO_THREAD_ID tid;
+ uint64_t time;
+ } data = { 0 };
+
+ /*
+ * Add some noise from the thread id and a high resolution timer.
+ * The thread id adds a little randomness if the drbg is accessed
+ * concurrently (which is the case for the <master> drbg).
+ */
+ data.tid = CRYPTO_THREAD_get_current_id();
+ data.time = get_timer_bits();
+
+ return rand_pool_add(pool, (unsigned char *)&data, sizeof(data), 0);
+}
+
+
+
+/*
+ * Get the current time with the highest possible resolution
+ *
+ * The time stamp is added to the nonce, so it is optimized for not repeating.
+ * The current time is ideal for this purpose, provided the computer's clock
+ * is synchronized.
+ */
+static uint64_t get_time_stamp(void)
+{
+# if defined(OSSL_POSIX_TIMER_OKAY)
+ {
+ struct timespec ts;
+
+ if (clock_gettime(CLOCK_REALTIME, &ts) == 0)
+ return TWO32TO64(ts.tv_sec, ts.tv_nsec);
+ }
+# endif
+# if defined(__unix__) \
+ || (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200112L)
+ {
+ struct timeval tv;
+
+ if (gettimeofday(&tv, NULL) == 0)
+ return TWO32TO64(tv.tv_sec, tv.tv_usec);
+ }
+# endif
+ return time(NULL);
+}
+
+/*
+ * Get an arbitrary timer value of the highest possible resolution
+ *
+ * The timer value is added as random noise to the additional data,
+ * which is not considered a trusted entropy sourec, so any result
+ * is acceptable.
+ */
+static uint64_t get_timer_bits(void)
+{
+ uint64_t res = OPENSSL_rdtsc();
+
+ if (res != 0)
+ return res;
+
+# if defined(__sun) || defined(__hpux)
+ return gethrtime();
+# elif defined(_AIX)
+ {
+ timebasestruct_t t;
+
+ read_wall_time(&t, TIMEBASE_SZ);
+ return TWO32TO64(t.tb_high, t.tb_low);
+ }
+# elif defined(OSSL_POSIX_TIMER_OKAY)
+ {
+ struct timespec ts;
+
+# ifdef CLOCK_BOOTTIME
+# define CLOCK_TYPE CLOCK_BOOTTIME
+# elif defined(_POSIX_MONOTONIC_CLOCK)
+# define CLOCK_TYPE CLOCK_MONOTONIC
+# else
+# define CLOCK_TYPE CLOCK_REALTIME
+# endif
+
+ if (clock_gettime(CLOCK_TYPE, &ts) == 0)
+ return TWO32TO64(ts.tv_sec, ts.tv_nsec);
+ }
+# endif
+# if defined(__unix__) \
+ || (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200112L)
+ {
+ struct timeval tv;
+
+ if (gettimeofday(&tv, NULL) == 0)
+ return TWO32TO64(tv.tv_sec, tv.tv_usec);
+ }
+# endif
+ return time(NULL);
}
#endif
projects / openssl.git / blobdiff