* [including the GNU Public Licence.]
*/
/* ====================================================================
- * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
+ * 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
#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))
+#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))
#include <sys/types.h>
#include <sys/time.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 */
-#ifdef __OpenBSD__
+ /* 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;
return 1;
}
-#else
+#else /* !defined(__OpenBSD__) */
int RAND_poll(void)
{
unsigned long l;
#endif
)) >= 0)
{
- struct timeval t = { 0, 10*1000 }; /* Spend 10ms on
- each file. */
+ int usec = 10*1000; /* spend 10ms on each file */
int r;
unsigned int j;
- fd_set fset;
struct stat *st=&randomstats[i];
/* Avoid using same input... Used to be O_NOFOLLOW
do
{
-#if defined(OPENSSL_SYS_BEOS_R5)
- /* select() is broken in BeOS R5, so we simply
- * try to read something and snooze if we couldn't: */
- r=read(fd,(unsigned char *)tmpbuf+n,
- ENTROPY_NEEDED-n);
- if (r > 0)
- n += r;
- else if (r == 0)
- snooze(t.tv_usec);
+ 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
- FD_ZERO(&fset);
- FD_SET(fd, &fset);
- r = -1;
+ /* use select() */
+ fd_set fset;
+ struct timeval t;
+
+ t.tv_sec = 0;
+ t.tv_usec = usec;
- if (select(fd+1,&fset,NULL,NULL,&t) < 0)
- t.tv_usec=0;
- else if (FD_ISSET(fd, &fset))
+ if (FD_SETSIZE > 0 && (unsigned)fd >= FD_SETSIZE)
+ {
+ /* can't use select, so just try to read once anyway */
+ try_read = 1;
+ }
+ else
{
- r=read(fd,(unsigned char *)tmpbuf+n,
- ENTROPY_NEEDED-n);
+ 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;
}
-#endif
- /* Some Unixen will update t, some
- won't. For those who won't, give
- up here, otherwise, we will do
+ 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 (t.tv_usec == 10*1000)
- t.tv_usec=0;
+ if (usec == 10*1000)
+ usec = 0;
}
- while ((r > 0 || (errno == EINTR || errno == EAGAIN))
- && t.tv_usec != 0 && n < ENTROPY_NEEDED);
+ while ((r > 0 ||
+ (errno == EINTR || errno == EAGAIN)) && usec != 0 && n < ENTROPY_NEEDED);
close(fd);
}
}
-#endif
+#endif /* defined(DEVRANDOM) */
#ifdef DEVRANDOM_EGD
/* Use an EGD socket to read entropy from an EGD or PRNGD entropy
if (r > 0)
n += r;
}
-#endif
+#endif /* defined(DEVRANDOM_EGD) */
#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
if (n > 0)
l=time(NULL);
RAND_add(&l,sizeof(l),0.0);
-#if defined(OPENSSL_SYS_BEOS)
- {
- system_info sysInfo;
- get_system_info(&sysInfo);
- RAND_add(&sysInfo,sizeof(sysInfo),0);
- }
-#endif
-
#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
return 1;
#else
#endif
}
-#endif
-#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)
int RAND_poll(void)
-{
- return 0;
-}
+ {
+ return 0;
+ }
#endif
projects / openssl.git / blobdiff