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115 lines
4.0 KiB
C
115 lines
4.0 KiB
C
/* crypto/des/rand_key.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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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.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library 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 cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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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(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(unsigned char *ret)
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{
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des_key_schedule ks;
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static DES_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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DES_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=(DES_LONG)time(NULL);
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l2c(t,p);
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t=(DES_LONG)((pid)|((c++)<<16));
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l2c(t,p);
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des_set_odd_parity(data);
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des_set_key(data,ks);
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des_cbc_cksum(key,key,sizeof(key),ks,data);
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des_set_odd_parity(key);
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des_set_key(key,ks);
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des_cbc_cksum(key,data,sizeof(key),ks,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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