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/*
** Copyright (c) 1999, 2000, 2001, 2002, 2003
** Adel I. Mirzazhanov. 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.The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <stdio.h>
#include <stdlib.h>
#if !defined(WIN32) && !defined(_WIN32) && !defined(__WIN32) && !defined(__WIN32__)
#include <strings.h>
#endif
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/time.h>
#include "rnd.h"
#ifndef APG_USE_SHA
# include "./cast/cast.h"
#else /* APG_USE_SHA */
# include "./sha/sha.h"
#endif /* APG_USE_SHA */
UINT32 __rnd_seed[2]; /* Random Seed 2*32=64 */
/*
** randint(int n) - Produces a Random number from 0 to n-1.
** INPUT:
** int - limit
** OUTPUT:
** UINT - pandom number.
** NOTES:
** none.
*/
UINT
randint(int n)
{
#ifndef APG_USE_SHA
return ( (UINT)( x917cast_rnd() % (UINT32)n ) );
#else /* APG_USE_SHA */
return ( (UINT)( x917sha1_rnd() % (UINT32)n ) );
#endif /* APG_USE_SHA */
}
#ifndef APG_USE_SHA
/*
** ANSI X9.17 pseudorandom generator that uses CAST algorithm instead of DES
** m = 1
** INPUT:
** none.
** OUTPUT:
** UINT32 - random number.
** NOTES:
** none.
*/
UINT32
x917cast_rnd (void)
{
#if !defined(WIN32) && !defined(_WIN32) && !defined(__WIN32) && !defined(__WIN32__)
struct timeval local_time;
#else
clock_t local_time[2]; /* clock ticks for win32 */
#endif
UINT32 I[2] = {0L,0L};
UINT32 I_plus_s[2] = {0L,0L};
UINT32 Xi[2] = {0L,0L};
UINT32 Xi_plus_I[2] = {0L,0L};
cast_key ky;
/**********************************************************************
* ENCRYPTION KEY HEX : 0x000102030405060708090A0B0C0D0E0F (128-bit) *
* YOU CAN CHANGE IT IF YOU WANT *
**********************************************************************/
u8 ro_key[16] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f};
/**********************************************************************
* ENCRYPTION KEY HEX : 0x000102030405060708090A0B0C0D0E0F (128-bit) *
* YOU CAN CHANGE IT IF YOU WANT *
**********************************************************************/
#if !defined(WIN32) && !defined(_WIN32) && !defined(__WIN32) && !defined(__WIN32__)
(void) gettimeofday (&local_time, 0);
#else
local_time[0] = clock();
local_time[1] = clock();
#endif
cast_setkey(&ky, (u8*)&ro_key[0], 16);
cast_encrypt (&ky, (u8 *)&local_time, (u8*)&I[0]); /* I=Ek(D), D-time */
I_plus_s[0] = I[0] ^ __rnd_seed[0]; /* I0 (+) s0 */
I_plus_s[1] = I[1] ^ __rnd_seed[1]; /* I1 (+) s1 */
cast_encrypt (&ky, (u8 *)&I_plus_s[0], (u8*)&Xi[0]); /* Xi=Ek( I (+) s ) */
Xi_plus_I[0] = Xi[0] ^ I[0]; /* Xi0 (+) I0 */
Xi_plus_I[1] = Xi[1] ^ I[1]; /* Xi1 (+) I1 */
cast_encrypt (&ky, (u8 *)&Xi_plus_I[0], (u8*)&__rnd_seed[0]); /* s=Ek( Xi (+) I ) */
return (Xi[0]);
}
#else /* APG_USE_SHA */
/*
** ANSI X9.17 pseudorandom generator that uses SHA1 algorithm instead of DES
** m=1
** INPUT:
** none.
** OUTPUT:
** UINT32 - random number.
** NOTES:
** none.
*/
UINT32
x917sha1_rnd (void)
{
struct timeval local_time;
UINT32 I[2] = {0L,0L};
UINT32 I_plus_s[2] = {0L,0L};
UINT32 Xi[2] = {0L,0L};
UINT32 Xi_plus_I[2] = {0L,0L};
BYTE hash [SHA_DIGESTSIZE];
apg_SHA_INFO shaInfo;
(void) gettimeofday (&local_time, 0);
apg_shaInit ( &shaInfo );
apg_shaUpdate ( &shaInfo, (BYTE *)&local_time, 8);
apg_shaFinal ( &shaInfo, hash );
(void)memcpy ( (void *)&I[0], (void *)&hash[0], sizeof(I));
I_plus_s[0] = I[0] ^ __rnd_seed[0]; /* I0 (+) s0 */
I_plus_s[1] = I[1] ^ __rnd_seed[1]; /* I1 (+) s1 */
apg_shaInit(&shaInfo);
apg_shaUpdate( &shaInfo, (BYTE *)&I_plus_s, 8);
apg_shaFinal( &shaInfo, hash );
(void)memcpy ( (void *)&Xi[0], (void *)&hash[0], sizeof(Xi)); /* Xi=Ek( I (+) s ) */
Xi_plus_I[0] = Xi[0] ^ I[0]; /* Xi0 (+) I0 */
Xi_plus_I[1] = Xi[1] ^ I[1]; /* Xi1 (+) I1 */
apg_shaInit(&shaInfo);
apg_shaUpdate( &shaInfo, (BYTE *)&Xi_plus_I, 8);
apg_shaFinal(&shaInfo, hash);
(void)memcpy ( (void *)&__rnd_seed[0], (void *)&hash[0],
sizeof(__rnd_seed)); /* s=Ek( Xi (+) I ) */
return (Xi[0]);
}
#endif /* APG_USE_SHA */
/*
** x917_setseed (UINT32 seed) - Initializes seed
** INPUT:
** UINT32 - seed value
** int - quiet mode flag
** OUTPUT:
** none.
** NOTES:
** none.
*/
void
x917_setseed (UINT32 seed, int quiet)
{
FILE * dr;
UINT32 drs[2];
UINT32 pid = 0;
pid = (UINT32)getpid();
if ( (dr = fopen(APG_DEVRANDOM, "r")) != NULL)
{
(void)fread( (void *)&drs[0], 8, 1, dr);
__rnd_seed[0] = seed ^ drs[0];
__rnd_seed[1] = seed ^ drs[1];
(void) fclose(dr);
}
else if ( (dr = fopen(APG_DEVURANDOM, "r")) != NULL)
{
(void)fread( (void *)&drs[0], 8, 1, dr);
__rnd_seed[0] = seed ^ drs[0];
__rnd_seed[1] = seed ^ drs[1];
(void) fclose(dr);
}
else
{
#ifndef CLISERV
#if !defined(WIN32) && !defined(_WIN32) && !defined(__WIN32) && !defined(__WIN32__)
if (quiet != TRUE)
{
fprintf(stderr,"CAN NOT USE RANDOM DEVICE TO GENERATE RANDOM SEED\n");
fprintf(stderr,"USING LOCAL TIME AND PID FOR SEED GENERATION !!!\n");
fflush(stderr);
}
#endif /* WIN32 */
#endif /* CLISERV */
__rnd_seed[0] = seed ^ pid;
__rnd_seed[1] = seed ^ pid;
}
}
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