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/*
** Copyright 1998 - 2006 Double Precision, Inc.
** See COPYING for distribution information.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include <time.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#define MD5_INTERNAL
#include "md5/md5.h"
#include "random128.h"
const char *random128()
{
static char randombuf[sizeof(MD5_DIGEST)*2+1];
#ifdef RANDOM
{
int fd=open(RANDOM, O_RDONLY);
char buf2[sizeof(MD5_DIGEST)];
int i;
if (fd >= 0)
{
if (read(fd, buf2, sizeof(buf2)) == sizeof(buf2))
{
for (i=0; i<sizeof(buf2); i++)
sprintf(randombuf+i*2,
"%02X",
(int)(unsigned char)buf2[i]);
close(fd);
return (randombuf);
}
close(fd);
}
}
#endif
/* /dev/urandom not available or broken? Create some noise */
{
int pipefd[2];
int s;
char buf[512];
struct MD5_CONTEXT context;
MD5_DIGEST digest;
int n;
time_t t;
pid_t p, p2;
unsigned long l;
time(&t);
p=getpid();
if (pipe(pipefd)) return (0);
while ((p=fork()) == -1)
{
sleep (5);
}
if (p == 0)
{
dup2(pipefd[1], 1);
dup2(pipefd[1], 2);
close(pipefd[0]);
close(pipefd[1]);
#ifdef W
while ((p=fork()) == -1)
{
sleep (5);
}
if (p == 0)
{
execl(W, W, (char *)0);
perror(W);
_exit(0);
}
while (wait(&s) >= 0)
;
#endif
execl(PS, PS, PS_OPTIONS, (char *)0);
perror(PS);
_exit(0);
}
close(pipefd[1]);
md5_context_init(&context);
md5_context_hashstream(&context, &t, sizeof(t));
md5_context_hashstream(&context, &p, sizeof(p));
l=sizeof(t)+sizeof(p);
while ((n=read(pipefd[0], buf, sizeof(buf))) > 0)
{
md5_context_hashstream(&context, buf, n);
l += n;
}
md5_context_endstream(&context, l);
md5_context_digest(&context, digest);
close(pipefd[0]);
while ((p2=wait(&s)) >= 0 && p != p2)
;
for (n=0; n<sizeof(digest); n++)
sprintf(randombuf+n*2,
"%02X", (int)(unsigned char)digest[n]);
}
return (randombuf);
}
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