155 lines
4.5 KiB
C
155 lines
4.5 KiB
C
/*
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* Copyright (c) 1995
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* Mark Murray. All rights reserved.
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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 above 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 Mark Murray
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* and Eric Young
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY MARK MURRAY AND CONTRIBUTORS ``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 REGENTS 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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* $Id$
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*/
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#include <unistd.h>
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#include <string.h>
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#include <sys/time.h>
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <machine/types.h>
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#include "des_locl.h"
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/* This counter keeps track of the pseudo-random sequence */
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static union {
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u_int32_t ul0, ul1;
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u_char uc[8];
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} counter;
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/* The current encryption schedule */
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static des_key_schedule current_key;
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/*
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* des_set_random_generator_seed: starts a new pseudorandom sequence
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* dependant on the supplied key
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*/
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void
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des_set_random_generator_seed(new_key)
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des_cblock *new_key;
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{
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des_key_sched(new_key, current_key);
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/* reset the counter */
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counter.ul0 = counter.ul1 = 0;
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}
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/*
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* des_set_sequence_number: set the counter to a known value
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*/
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void
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des_set_sequence_number(new_counter)
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des_cblock new_counter;
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{
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bcopy((void *)new_counter, (char *)counter.uc, sizeof(counter));
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}
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/*
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* des_generate_random_block: returns the next 64 bit random number
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*/
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void des_generate_random_block(random_block)
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des_cblock *random_block;
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{
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/* Encrypt the counter to get pseudo-random numbers */
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des_ecb_encrypt(&counter.uc, random_block, current_key, DES_ENCRYPT);
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/* increment the 64-bit counter */
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counter.ul0++;
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if (!counter.ul0) counter.ul1++;
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}
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/*
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* des_new_random_key: Invents a new, random strong key with odd parity.
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*/
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int
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des_new_random_key(new_key)
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des_cblock *new_key;
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{
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do {
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des_generate_random_block(new_key);
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des_set_odd_parity(new_key);
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} while (des_is_weak_key(new_key));
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return(0);
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}
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/*
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* des_init_random_number_generator: intialises the random number generator
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* to a truly nasty sequence using system
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* supplied volatile variables.
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*/
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void
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des_init_random_number_generator(key)
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des_cblock *key;
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{
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/* 64-bit structures */
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struct {
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u_int32_t pid;
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u_int32_t hostid;
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} sysblock;
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struct timeval timeblock;
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struct {
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u_int32_t tv_sec;
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u_int32_t tv_usec;
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} time64bit;
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des_cblock new_key;
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int mib[2];
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size_t len;
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/* Get host ID using official BSD 4.4 method */
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mib[0] = CTL_KERN;
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mib[1] = KERN_HOSTID;
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len = sizeof(sysblock.hostid);
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sysctl(mib, 2, &sysblock.hostid, &len, NULL, 0);
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/* Get Process ID */
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sysblock.pid = getpid();
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/* Generate a new key, and use it to seed the random generator */
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des_set_random_generator_seed(key);
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des_set_sequence_number((unsigned char *)&sysblock);
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des_new_random_key(&new_key);
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des_set_random_generator_seed(&new_key);
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/* Try to confuse the sequence counter */
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gettimeofday(&timeblock, NULL);
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time64bit.tv_sec = (u_int32_t)timeblock.tv_sec;
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time64bit.tv_usec = (u_int32_t)timeblock.tv_usec;
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des_set_sequence_number((unsigned char *)&time64bit);
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/* Do the work */
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des_new_random_key(&new_key);
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des_set_random_generator_seed(&new_key);
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}
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