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Hack for systems that lack setitimer (like crays).

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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@738 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Johan Danielsson
1996-09-14 21:11:14 +00:00
parent 403e1eb526
commit 234a5f7a3a
1 changed files with 34 additions and 5 deletions
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39
lib/des/rnd_keys.c
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@@ -112,22 +112,37 @@ sigALRM(int sig)
SIGRETURN(0);
}
#if !defined(HAVE_SETITIMER) && defined(HAVE_RANDOM)
#ifdef HAVE_RANDOM
/* XXX this is a quick hack, should be fixed */
void
des_rand_data(unsigned char *data, int size)
des_not_rand_data(unsigned char *data, int size)
{
int i;
srandom (time (NULL));
for(i = 0; i < size; ++i)
data[i] = random() % 0x100;
data[i] ^= random() % 0x100;
}
#else
#endif
#ifndef HAVE_SETITIMER
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
/*
* Generate size bytes of "random" data using timed interrupts.
@@ -140,6 +155,7 @@ des_rand_data(unsigned char *data, int size)
struct itimerval tv, otv;
struct sigaction sa, osa;
int i, j;
pid_t pid;
/*
* If there is a /dev/random it's use is preferred.
@@ -181,7 +197,17 @@ des_rand_data(unsigned char *data, int size)
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
pid = fork();
if(pid == -1){
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 */
@@ -189,10 +215,13 @@ des_rand_data(unsigned char *data, int size)
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);
#endif
sigaction(SIGALRM, &osa, 0);
}
#endif
void
des_generate_random_block(des_cblock *block)