108 lines
3.6 KiB
C
108 lines
3.6 KiB
C
/* lib/des/rand_key.c */
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/* Copyright (C) 1995 Eric Young (eay@mincom.oz.au)
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* All rights reserved.
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*
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* This file is part of an SSL implementation written
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* by Eric Young (eay@mincom.oz.au).
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* The implementation was written so as to conform with Netscapes SSL
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* specification. This library and applications are
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* FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
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* as long as the following conditions are aheared to.
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed. If this code is used in a product,
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* Eric Young should be given attribution as the author of the parts used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Eric Young (eay@mincom.oz.au)
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include "des_locl.h"
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#include <time.h>
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static int seed=0;
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static des_cblock init;
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void des_random_seed(key)
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des_cblock key;
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{
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memcpy(init,key,sizeof(des_cblock));
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seed=1;
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}
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void des_random_key(ret)
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unsigned char *ret;
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{
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des_key_schedule ks;
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static unsigned long c=0;
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static unsigned short pid=0;
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static des_cblock data={0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef};
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des_cblock key;
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unsigned char *p;
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unsigned long t;
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int i;
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#ifdef MSDOS
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pid=1;
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#else
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if (!pid) pid=getpid();
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#endif
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p=key;
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if (seed)
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{
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for (i=0; i<8; i++)
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{
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data[i] ^= init[i];
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init[i]=0;
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}
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seed=0;
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}
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t=(unsigned long)time(NULL);
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l2c(t,p);
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t=(unsigned long)((pid)|((c++)<<16));
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l2c(t,p);
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des_set_odd_parity((des_cblock *)data);
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des_set_key((des_cblock *)data,ks);
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des_cbc_cksum((des_cblock *)key,(des_cblock *)key,
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(long)sizeof(key),ks,(des_cblock *)data);
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des_set_odd_parity((des_cblock *)key);
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des_set_key((des_cblock *)key,ks);
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des_cbc_cksum((des_cblock *)key,(des_cblock *)data,
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(long)sizeof(key),ks,(des_cblock *)key);
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memcpy(ret,data,sizeof(key));
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memset(key,0,sizeof(key));
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memset(ks,0,sizeof(ks));
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t=0;
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}
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