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/* lib/des/rand_key.c */
/* Copyright (C) 1995 Eric Young (eay@mincom.oz.au)
* All rights reserved.
*
* This file is part of an SSL implementation written
* by Eric Young (eay@mincom.oz.au).
* The implementation was written so as to conform with Netscapes SSL
* specification. This library and applications are
* FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
* as long as the following conditions are aheared to.
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed. If this code is used in a product,
* Eric Young should be given attribution as the author of the parts used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* 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 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Eric Young (eay@mincom.oz.au)
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 OR CONTRIBUTORS 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.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include "des_locl.h"
#include <time.h>
static int seed=0;
static des_cblock init;
void des_random_seed(key)
des_cblock key;
{
memcpy(init,key,sizeof(des_cblock));
seed=1;
}
void des_random_key(ret)
unsigned char *ret;
{
des_key_schedule ks;
static unsigned long c=0;
static unsigned short pid=0;
static des_cblock data={0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef};
des_cblock key;
unsigned char *p;
unsigned long t;
int i;
#ifdef MSDOS
pid=1;
#else
if (!pid) pid=getpid();
#endif
p=key;
if (seed)
{
for (i=0; i<8; i++)
{
data[i] ^= init[i];
init[i]=0;
}
seed=0;
}
t=(unsigned long)time(NULL);
l2c(t,p);
t=(unsigned long)((pid)|((c++)<<16));
l2c(t,p);
des_set_odd_parity((des_cblock *)data);
des_set_key_schedule((des_cblock *)data,ks);
des_cbc_cksum((des_cblock *)key,(des_cblock *)key,
(long)sizeof(key),ks,(des_cblock *)data);
des_set_odd_parity((des_cblock *)key);
des_set_key_schedule((des_cblock *)key,ks);
des_cbc_cksum((des_cblock *)key,(des_cblock *)data,
(long)sizeof(key),ks,(des_cblock *)key);
memcpy(ret,data,sizeof(key));
memset(key,0,sizeof(key));
memset(ks,0,sizeof(ks));
t=0;
}
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