diff options
Diffstat (limited to 'third_party/heimdal/lib/hcrypto/rand-timer.c')
| -rw-r--r-- | third_party/heimdal/lib/hcrypto/rand-timer.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/hcrypto/rand-timer.c b/third_party/heimdal/lib/hcrypto/rand-timer.c new file mode 100644 index 0000000..935a3a7 --- /dev/null +++ b/third_party/heimdal/lib/hcrypto/rand-timer.c @@ -0,0 +1,210 @@ +/* + * Copyright (c) 1995, 1996, 1997, 1999, 2007 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * 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. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE 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. + */ + +#include <config.h> +#include <roken.h> + +#include <rand.h> + +#include "randi.h" + +#ifndef WIN32 /* don't bother with this on windows */ + +static volatile int counter; +static volatile unsigned char *gdata; /* Global data */ +static volatile int igdata; /* Index into global data */ +static int gsize; + +static +RETSIGTYPE +sigALRM(int sig) +{ + if (igdata < gsize) + gdata[igdata++] ^= counter & 0xff; + +#ifndef HAVE_SIGACTION + signal(SIGALRM, sigALRM); /* Reinstall SysV signal handler */ +#endif + SIGRETURN(0); +} + +#ifndef HAVE_SETITIMER +static void +pacemaker(struct timeval *tv) +{ + fd_set fds; + pid_t pid; + pid = getppid(); + while(1){ + FD_ZERO(&fds); + FD_SET(0, &fds); + select(1, &fds, NULL, NULL, tv); + kill(pid, SIGALRM); + } +} +#endif + +#ifdef HAVE_SIGACTION +/* XXX ugly hack, should perhaps use function from roken */ +static RETSIGTYPE +(*fake_signal(int sig, RETSIGTYPE (*f)(int)))(int) +{ + struct sigaction sa, osa; + sa.sa_handler = f; + sa.sa_flags = 0; + sigemptyset(&sa.sa_mask); + sigaction(sig, &sa, &osa); + return osa.sa_handler; +} +#define signal(S, F) fake_signal((S), (F)) +#endif + +#endif /* WIN32*/ + +/* + * + */ + +static void +timer_seed(const void *indata, int size) +{ +} + +static int +timer_bytes(unsigned char *outdata, int size) +{ +#ifdef WIN32 + return 0; +#else /* WIN32 */ + struct itimerval tv, otv; + RETSIGTYPE (*osa)(int); + int i, j; +#ifndef HAVE_SETITIMER + RETSIGTYPE (*ochld)(int); + pid_t pid; +#endif + + gdata = outdata; + gsize = size; + igdata = 0; + + osa = signal(SIGALRM, sigALRM); + + /* Start timer */ + tv.it_value.tv_sec = 0; + tv.it_value.tv_usec = 10 * 1000; /* 10 ms */ + tv.it_interval = tv.it_value; +#ifdef HAVE_SETITIMER + setitimer(ITIMER_REAL, &tv, &otv); +#else + ochld = signal(SIGCHLD, SIG_IGN); + pid = fork(); + if(pid == -1){ + signal(SIGCHLD, ochld != SIG_ERR ? ochld : SIG_DFL); + des_not_rand_data(data, size); + return; + } + if(pid == 0) + pacemaker(&tv.it_interval); +#endif + + for(i = 0; i < 4; i++) { + for (igdata = 0; igdata < size;) /* igdata++ in sigALRM */ + counter++; + for (j = 0; j < size; j++) /* Only use 2 bits each lap */ + gdata[j] = (gdata[j]>>2) | (gdata[j]<<6); + } +#ifdef HAVE_SETITIMER + setitimer(ITIMER_REAL, &otv, 0); +#else + kill(pid, SIGKILL); + while(waitpid(pid, NULL, 0) != pid); + signal(SIGCHLD, ochld != SIG_ERR ? ochld : SIG_DFL); +#endif + signal(SIGALRM, osa != SIG_ERR ? osa : SIG_DFL); + + return 1; +#endif +} + +static void +timer_cleanup(void) +{ +} + +static void +timer_add(const void *indata, int size, double entropi) +{ +} + +static int +timer_pseudorand(unsigned char *outdata, int size) +{ + return timer_bytes(outdata, size); +} + +static int +timer_status(void) +{ +#ifdef WIN32 + return 0; +#else + return 1; +#endif +} + +#if defined(__GNUC__) || (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901) +const RAND_METHOD hc_rand_timer_method = { + .seed = timer_seed, + .bytes = timer_bytes, + .cleanup = timer_cleanup, + .add = timer_add, + .pseudorand = timer_pseudorand, + .status = timer_status +}; +#else +const RAND_METHOD hc_rand_timer_method = { + timer_seed, + timer_bytes, + timer_cleanup, + timer_add, + timer_pseudorand, + timer_status +}; +#endif + +const RAND_METHOD * +RAND_timer_method(void) +{ + return &hc_rand_timer_method; +} |