rand_key.c revision 55714
155714Skris/* crypto/des/rand_key.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 855714Skris * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 1555714Skris * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 2255714Skris * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 3755714Skris * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 4055714Skris * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 5255714Skris * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris 5955714Skris#include "des_locl.h" 6055714Skris#include <time.h> 6155714Skris 6255714Skrisstatic int seed=0; 6355714Skrisstatic des_cblock init; 6455714Skris 6555714Skrisvoid des_random_seed(des_cblock *key) 6655714Skris { 6755714Skris memcpy(&init,key,sizeof(des_cblock)); 6855714Skris seed=1; 6955714Skris } 7055714Skris 7155714Skrisvoid des_random_key(des_cblock *ret) 7255714Skris { 7355714Skris des_key_schedule ks; 7455714Skris static DES_LONG c=0; 7555714Skris static unsigned short pid=0; 7655714Skris static des_cblock data={0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef}; 7755714Skris des_cblock key; 7855714Skris unsigned char *p; 7955714Skris DES_LONG t; 8055714Skris int i; 8155714Skris 8255714Skris#ifdef MSDOS 8355714Skris pid=1; 8455714Skris#else 8555714Skris if (!pid) pid=getpid(); 8655714Skris#endif 8755714Skris p=key; 8855714Skris if (seed) 8955714Skris { 9055714Skris for (i=0; i<8; i++) 9155714Skris { 9255714Skris data[i] ^= init[i]; 9355714Skris init[i]=0; 9455714Skris } 9555714Skris seed=0; 9655714Skris } 9755714Skris t=(DES_LONG)time(NULL); 9855714Skris l2c(t,p); 9955714Skris t=(DES_LONG)((pid)|((c++)<<16)); 10055714Skris l2c(t,p); 10155714Skris 10255714Skris des_set_odd_parity(&data); 10355714Skris des_set_key(&data,ks); 10455714Skris des_cbc_cksum(key,&key,sizeof(key),ks,&data); 10555714Skris 10655714Skris des_set_odd_parity(&key); 10755714Skris des_set_key(&key,ks); 10855714Skris des_cbc_cksum(key,&data,sizeof(key),ks,&key); 10955714Skris 11055714Skris memcpy(ret,data,sizeof(key)); 11155714Skris memset(key,0,sizeof(key)); 11255714Skris memset(ks,0,sizeof(ks)); 11355714Skris t=0; 11455714Skris } 115