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Integrated jodas random stuff

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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@275 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Björn Groenvall
1996-02-22 11:40:02 +00:00
parent 364fd9b727
commit 5b95f7bfce
1 changed files with 110 additions and 10 deletions
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120
lib/des/rnd_keys.c
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@@ -10,6 +10,7 @@ RCSID("$Id$");
#endif
#include <sys/types.h>
#include <signal.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
@@ -92,16 +93,15 @@ des_new_random_key(des_cblock *key)
if (!initialized)
do_initialize();
try_again:
des_ecb_encrypt((des_cblock *) sequence_index,
key,
sequence_seed,
DES_ENCRYPT);
incr_long_long(sequence_index);
/* random key must have odd parity and not be weak */
des_set_odd_parity(key);
if (des_is_weak_key(key))
goto try_again;
do {
des_ecb_encrypt((des_cblock *) sequence_index,
key,
sequence_seed,
DES_ENCRYPT);
incr_long_long(sequence_index);
/* random key must have odd parity and not be weak */
des_set_odd_parity(key);
} while (des_is_weak_key(key));
return(0);
}
@@ -152,9 +152,109 @@ des_init_random_number_generator(des_cblock *seed)
des_set_random_generator_seed(&new_key);
}
/*
* Generate 8 bytes of "random" data by checksumming the first 2
* megabytes of /dev/mem.
*/
void
des_mem_rand8(unsigned char *data)
{
}
/*
* These guys are for clocked "non crypto" randomness.
*
* The method used is described on page 424 in
* Applied Cryptography 2 ed. by Bruce Schneier.
*/
static volatile int counter;
static volatile unsigned char *gdata; /* Global data */
static volatile int igdata; /* Index into global data */
static
RETSIGTYPE
sigALRM(int sig)
{
if (igdata < sizeof(des_cblock))
gdata[igdata++] ^= counter & 0xff;
#ifdef VOID_RETSIGTYPE
return;
#else
return (RETSIGTYPE)0;
#endif
}
/*
* Generate size bytes of "random" data using timed interrupts.
* This is a slooow routine but it's meant to be slow.
* It's not neccessary to be root to run it.
*/
void
des_clock_rand(unsigned char *data, int size)
{
struct itimerval tv, otv;
struct sigaction sa, osa;
int i;
gdata = data;
igdata = 0;
counter = 0;
/* Setup signal handler */
memset(&sa, 0, sizeof(sa));
sa.sa_handler = sigALRM;
sigaction(SIGALRM, &sa, &osa);
/* Start timer */
tv.it_value.tv_sec = 0;
tv.it_value.tv_usec = 50 * 1000; /* 50 ms */
tv.it_interval = tv.it_value;
setitimer(ITIMER_REAL, &tv, &otv);
for(i = 0; i < 4; i++)
{
for (igdata = 0; igdata < size;)
counter++;
for (igdata = 0; igdata < size; igdata++)
gdata[igdata] = (gdata[igdata]>>2) | (gdata[igdata]<<6);
}
setitimer(ITIMER_REAL, &otv, 0);
sigaction(SIGALRM, &osa, 0);
}
/*
* Generate a "random" DES key.
*/
void
des_clock_rand_key(des_cblock *key)
{
do {
des_clock_rand((unsigned char*)key, sizeof(des_cblock));
des_set_odd_parity(key);
} while(des_is_weak_key(key));
}
/* This is for backwards compatibility. */
int
des_random_key(unsigned char *ret)
{
return des_new_random_key((des_cblock *) ret);
}
#ifdef TESTRUN
int
main()
{
unsigned char data[8];
int i;
while (1)
{
des_clock_rand(data, 8);
for (i = 0; i < 8; i++)
printf("%02x", data[i]);
printf("\n");
}
}
#endif