/* crypto/des/new_rkey.c */ /* Copyright (C) 1995-1996 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.] */ /* * Copyright (c) 1995 * Mark Murray. All rights reserved. * * 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 above 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 Mark Murray * and Eric Young * 4. Neither the name of the author nor the names of any co-contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY MARK MURRAY AND CONTRIBUTORS ``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 REGENTS 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. * * $Id: new_rkey.c,v 1.1.1.3 1996/07/29 17:54:29 markm Exp $ */ /* 21-Nov-95 - eay - I've finally put this into libdes, I have made a * few changes since it need to compile on all version of unix and * there were a few things that would not :-) */ #include #include #include #include #include #include #include #include "des_locl.h" /* This counter keeps track of the pseudo-random sequence */ static union { DES_LONG ul0, ul1; unsigned char uc[8]; } counter; /* The current encryption schedule */ static des_key_schedule current_key; /* * des_set_random_generator_seed: starts a new pseudorandom sequence * dependant on the supplied key */ void des_set_random_generator_seed(new_key) des_cblock *new_key; { des_key_sched(new_key, current_key); /* reset the counter */ counter.ul0 = counter.ul1 = 0; } /* * des_set_sequence_number: set the counter to a known value */ void des_set_sequence_number(new_counter) des_cblock new_counter; { memcpy((char *)counter.uc,(char *)new_counter,sizeof(counter)); } /* * des_generate_random_block: returns the next 64 bit random number */ void des_generate_random_block(random_block) des_cblock *random_block; { /* Encrypt the counter to get pseudo-random numbers */ des_ecb_encrypt(&counter.uc, random_block, current_key, DES_ENCRYPT); /* increment the 64-bit counter * (or that could be a 128 bit counter on a 64 bit box - eay */ if (!++counter.ul0) counter.ul1++; } /* * des_new_random_key: Invents a new, random strong key with odd parity. */ int des_new_random_key(new_key) des_cblock *new_key; { do { des_generate_random_block(new_key); des_set_odd_parity(new_key); } while (des_is_weak_key(new_key)); return(0); } /* * des_init_random_number_generator: intialises the random number generator * to a truly nasty sequence using system * supplied volatile variables. */ /* Name shortened for VMS - there is a macro for the old name */ void des_init_random_num_generator(key) des_cblock *key; { /* 64-bit structures */ struct { u_int32_t pid; u_int32_t hostid; } sysblock; struct timeval timeblock; struct { u_int32_t tv_sec; u_int32_t tv_usec; } time64bit; u_int32_t devrandom[2]; des_cblock new_key; int mib[2]; size_t len; int dr; /* Get host ID using official BSD 4.4 method */ mib[0] = CTL_KERN; mib[1] = KERN_HOSTID; len = sizeof(sysblock.hostid); sysctl(mib, 2, &sysblock.hostid, &len, NULL, 0); /* Get Process ID */ sysblock.pid = getpid(); /* Generate a new key, and use it to seed the random generator */ des_set_random_generator_seed(key); des_set_sequence_number((unsigned char *)&sysblock); des_new_random_key(&new_key); des_set_random_generator_seed(&new_key); /* Try to confuse the sequence counter */ gettimeofday(&timeblock, NULL); time64bit.tv_sec = (u_int32_t)timeblock.tv_sec; time64bit.tv_usec = (u_int32_t)timeblock.tv_usec; /* If /dev/random is available, read some muck */ dr = open("/dev/random", O_RDONLY); if (dr >= 0) { /* Set the descriptor into non-blocking mode. */ fcntl(dr, F_SETFL, O_NONBLOCK); len = read(dr, devrandom, sizeof(devrandom)); close(dr); if (len > 0) { time64bit.tv_sec ^= devrandom[0]; time64bit.tv_usec ^= devrandom[1]; } #ifdef DEBUG printf("DEBUG: read from /dev/random %d %x %x\n", len, devrandom[0], devrandom[1]); #endif } #ifdef DEBUG else printf("Cannot open /dev/random\n"); #endif des_set_sequence_number((unsigned char *)&time64bit); /* Do the work */ des_new_random_key(&new_key); des_set_random_generator_seed(&new_key); }