| /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| * 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.] |
| */ |
| /* ==================================================================== |
| * Copyright (c) 1998-2006 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. |
| * |
| * 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. |
| * |
| * 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/)" |
| * |
| * 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. |
| * ==================================================================== |
| * |
| * This product includes cryptographic software written by Eric Young |
| * (eay@cryptsoft.com). This product includes software written by Tim |
| * Hudson (tjh@cryptsoft.com). |
| * |
| */ |
| #include <stdio.h> |
| |
| #define USE_SOCKETS |
| #include "e_os.h" |
| #include "internal/cryptlib.h" |
| #include <openssl/rand.h> |
| #include "rand_lcl.h" |
| |
| #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) || defined(OPENSSL_SYS_UEFI)) |
| |
| # include <sys/types.h> |
| # include <sys/time.h> |
| # include <sys/times.h> |
| # include <sys/stat.h> |
| # include <fcntl.h> |
| # include <unistd.h> |
| # include <time.h> |
| # if defined(OPENSSL_SYS_LINUX) /* should actually be available virtually |
| * everywhere */ |
| # include <poll.h> |
| # endif |
| # include <limits.h> |
| # ifndef FD_SETSIZE |
| # define FD_SETSIZE (8*sizeof(fd_set)) |
| # endif |
| |
| # if defined(OPENSSL_SYS_VOS) |
| |
| /* |
| * 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 this code 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. |
| * |
| * As a precaution, we generate 4 times the minimum required amount of seed |
| * data. |
| */ |
| |
| int RAND_poll(void) |
| { |
| short int code; |
| gid_t curr_gid; |
| pid_t curr_pid; |
| uid_t curr_uid; |
| int i, k; |
| struct timespec ts; |
| unsigned char v; |
| |
| # ifdef OPENSSL_SYS_VOS_HPPA |
| long duration; |
| extern void s$sleep(long *_duration, short int *_code); |
| # else |
| # ifdef OPENSSL_SYS_VOS_IA32 |
| long long duration; |
| extern void s$sleep2(long long *_duration, short int *_code); |
| # else |
| # error "Unsupported Platform." |
| # endif /* OPENSSL_SYS_VOS_IA32 */ |
| # endif /* OPENSSL_SYS_VOS_HPPA */ |
| |
| /* |
| * Seed with the gid, pid, and uid, to ensure *some* variation between |
| * different processes. |
| */ |
| |
| curr_gid = getgid(); |
| RAND_add(&curr_gid, sizeof curr_gid, 1); |
| curr_gid = 0; |
| |
| curr_pid = getpid(); |
| RAND_add(&curr_pid, sizeof curr_pid, 1); |
| curr_pid = 0; |
| |
| curr_uid = getuid(); |
| RAND_add(&curr_uid, sizeof curr_uid, 1); |
| curr_uid = 0; |
| |
| for (i = 0; i < (ENTROPY_NEEDED * 4); 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$sleep(&duration, &code); |
| # else |
| # ifdef OPENSSL_SYS_VOS_IA32 |
| /* sleep for 1/65536 of a second (15 us). */ |
| duration = 1; |
| s$sleep2(&duration, &code); |
| # endif /* OPENSSL_SYS_VOS_IA32 */ |
| # endif /* OPENSSL_SYS_VOS_HPPA */ |
| |
| /* get wall clock time. */ |
| clock_gettime(CLOCK_REALTIME, &ts); |
| |
| /* take 8 bits */ |
| v = (unsigned char)(ts.tv_nsec % 256); |
| RAND_add(&v, sizeof v, 1); |
| v = 0; |
| } |
| return 1; |
| } |
| # elif defined __OpenBSD__ |
| int RAND_poll(void) |
| { |
| u_int32_t rnd = 0, i; |
| unsigned char buf[ENTROPY_NEEDED]; |
| |
| for (i = 0; i < sizeof(buf); i++) { |
| if (i % 4 == 0) |
| rnd = arc4random(); |
| buf[i] = rnd; |
| rnd >>= 8; |
| } |
| RAND_add(buf, sizeof(buf), ENTROPY_NEEDED); |
| memset(buf, 0, sizeof(buf)); |
| |
| return 1; |
| } |
| # else /* !defined(__OpenBSD__) */ |
| int RAND_poll(void) |
| { |
| unsigned long l; |
| pid_t curr_pid = getpid(); |
| # if defined(DEVRANDOM) || (!defined(OPENSS_NO_EGD) && defined(DEVRANDOM_EGD)) |
| unsigned char tmpbuf[ENTROPY_NEEDED]; |
| int n = 0; |
| # endif |
| # ifdef DEVRANDOM |
| static const char *randomfiles[] = { DEVRANDOM }; |
| struct stat randomstats[OSSL_NELEM(randomfiles)]; |
| int fd; |
| unsigned int i; |
| # endif |
| # if !defined(OPENSSL_NO_EGD) && defined(DEVRANDOM_EGD) |
| static const char *egdsockets[] = { DEVRANDOM_EGD, NULL }; |
| const char **egdsocket = NULL; |
| # endif |
| |
| # ifdef DEVRANDOM |
| memset(randomstats, 0, sizeof(randomstats)); |
| /* |
| * 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 (i = 0; (i < OSSL_NELEM(randomfiles)) && (n < ENTROPY_NEEDED); i++) { |
| if ((fd = open(randomfiles[i], O_RDONLY |
| # ifdef O_NONBLOCK |
| | O_NONBLOCK |
| # endif |
| # ifdef O_BINARY |
| | O_BINARY |
| # endif |
| # ifdef O_NOCTTY /* If it happens to be a TTY (god forbid), do |
| * not make it our controlling tty */ |
| | O_NOCTTY |
| # endif |
| )) >= 0) { |
| int usec = 10 * 1000; /* spend 10ms on each file */ |
| int r; |
| unsigned int j; |
| struct stat *st = &randomstats[i]; |
| |
| /* |
| * Avoid using same input... Used to be O_NOFOLLOW above, but |
| * it's not universally appropriate... |
| */ |
| if (fstat(fd, st) != 0) { |
| close(fd); |
| continue; |
| } |
| for (j = 0; j < i; j++) { |
| if (randomstats[j].st_ino == st->st_ino && |
| randomstats[j].st_dev == st->st_dev) |
| break; |
| } |
| if (j < i) { |
| close(fd); |
| continue; |
| } |
| |
| do { |
| int try_read = 0; |
| |
| # if defined(OPENSSL_SYS_LINUX) |
| /* use poll() */ |
| struct pollfd pset; |
| |
| pset.fd = fd; |
| pset.events = POLLIN; |
| pset.revents = 0; |
| |
| if (poll(&pset, 1, usec / 1000) < 0) |
| usec = 0; |
| else |
| try_read = (pset.revents & POLLIN) != 0; |
| |
| # else |
| /* use select() */ |
| fd_set fset; |
| struct timeval t; |
| |
| t.tv_sec = 0; |
| t.tv_usec = usec; |
| |
| if (FD_SETSIZE > 0 && (unsigned)fd >= FD_SETSIZE) { |
| /* |
| * can't use select, so just try to read once anyway |
| */ |
| try_read = 1; |
| } else { |
| FD_ZERO(&fset); |
| FD_SET(fd, &fset); |
| |
| if (select(fd + 1, &fset, NULL, NULL, &t) >= 0) { |
| usec = t.tv_usec; |
| if (FD_ISSET(fd, &fset)) |
| try_read = 1; |
| } else |
| usec = 0; |
| } |
| # endif |
| |
| if (try_read) { |
| r = read(fd, (unsigned char *)tmpbuf + n, |
| ENTROPY_NEEDED - n); |
| if (r > 0) |
| n += r; |
| } else |
| r = -1; |
| |
| /* |
| * Some Unixen will update t in select(), some won't. For |
| * those who won't, or if we didn't use select() in the first |
| * place, give up here, otherwise, we will do this once again |
| * for the remaining time. |
| */ |
| if (usec == 10 * 1000) |
| usec = 0; |
| } |
| while ((r > 0 || |
| (errno == EINTR || errno == EAGAIN)) && usec != 0 |
| && n < ENTROPY_NEEDED); |
| |
| close(fd); |
| } |
| } |
| # endif /* defined(DEVRANDOM) */ |
| |
| # if !defined(OPENSSL_NO_EGD) && defined(DEVRANDOM_EGD) |
| /* |
| * Use an EGD socket to read entropy from an EGD or PRNGD entropy |
| * collecting daemon. |
| */ |
| |
| for (egdsocket = egdsockets; *egdsocket && n < ENTROPY_NEEDED; |
| egdsocket++) { |
| int r; |
| |
| r = RAND_query_egd_bytes(*egdsocket, (unsigned char *)tmpbuf + n, |
| ENTROPY_NEEDED - n); |
| if (r > 0) |
| n += r; |
| } |
| # endif /* defined(DEVRANDOM_EGD) */ |
| |
| # if defined(DEVRANDOM) || (!defined(OPENSSL_NO_EGD) && defined(DEVRANDOM_EGD)) |
| if (n > 0) { |
| RAND_add(tmpbuf, sizeof tmpbuf, (double)n); |
| OPENSSL_cleanse(tmpbuf, n); |
| } |
| # endif |
| |
| /* put in some default random data, we need more than just this */ |
| l = curr_pid; |
| RAND_add(&l, sizeof(l), 0.0); |
| l = getuid(); |
| RAND_add(&l, sizeof(l), 0.0); |
| |
| l = time(NULL); |
| RAND_add(&l, sizeof(l), 0.0); |
| |
| # if defined(DEVRANDOM) || (!defined(OPENSSL_NO_EGD) && defined(DEVRANDOM_EGD)) |
| return 1; |
| # else |
| return 0; |
| # endif |
| } |
| |
| # endif /* defined(__OpenBSD__) */ |
| #endif /* !(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(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_UEFI) |
| int RAND_poll(void) |
| { |
| return 0; |
| } |
| #endif |
