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/*
* lib/crypto/os/rnd_confoun.c
*
* Copyright 1990 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* krb5_random_confounder()
*/
#include "k5-int.h"
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#ifdef TIME_WITH_SYS_TIME
#include <time.h>
#endif
#else
#include <time.h>
#endif
#ifdef HAVE_SRAND48
#define SRAND srand48
#define RAND lrand48
#define RAND_TYPE long
#endif
#if !defined(RAND_TYPE) && defined(HAVE_SRAND)
#define SRAND srand
#define RAND rand
#define RAND_TYPE int
#endif
#if !defined(RAND_TYPE) && defined(HAVE_SRANDOM)
#define SRAND srandom
#define RAND random
#define RAND_TYPE long
#endif
#if !defined(RAND_TYPE)
You need a random number generator!
#endif
/*
* Generate a random confounder
*/
KRB5_DLLIMP krb5_error_code KRB5_CALLCONV
krb5_random_confounder(size, fillin)
size_t size;
krb5_pointer fillin;
{
static int seeded = 0;
register krb5_octet *real_fill;
RAND_TYPE rval;
if (!seeded) {
/* time() defined in 4.12.2.4, but returns a time_t, which is an
"arithmetic type" (4.12.1) */
rval = (RAND_TYPE) time(0);
SRAND(rval);
#ifdef HAVE_GETPID
rval = RAND();
rval ^= getpid();
SRAND(rval);
#endif
seeded = 1;
}
real_fill = (krb5_octet *)fillin;
while (size > 0) {
rval = RAND();
*real_fill = rval & 0xff;
real_fill++;
size--;
if (size) {
*real_fill = (rval >> 8) & 0xff;
real_fill++;
size--;
}
}
return 0;
}
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