diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/rand/rand_unix.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/rand/rand_unix.c | 324 |
1 files changed, 324 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/rand/rand_unix.c b/openssl-1.1.0h/crypto/rand/rand_unix.c new file mode 100644 index 0000000..7a5a948 --- /dev/null +++ b/openssl-1.1.0h/crypto/rand/rand_unix.c @@ -0,0 +1,324 @@ +/* + * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. + * + * 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 + */ + +#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_VXWORKS) || 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); + OPENSSL_cleanse(buf, 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_VXWORKS) */ + +#if defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_UEFI) +int RAND_poll(void) +{ + return 0; +} +#endif |