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Annotation of 43BSDReno/kerberosIV/des/random_key.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * $Source: /mit/kerberos/src/lib/des/RCS/random_key.c,v $
                      3:  * $Author: jtkohl $
                      4:  *
                      5:  * Copyright 1988 by the Massachusetts Institute of Technology.
                      6:  *
                      7:  * For copying and distribution information, please see the file
                      8:  * <mit-copyright.h>.
                      9:  *
                     10:  * These routines perform encryption and decryption using the DES
                     11:  * private key algorithm, or else a subset of it-- fewer inner loops.
                     12:  * ( AUTH_DES_ITER defaults to 16, may be less)
                     13:  *
                     14:  * Under U.S. law, this software may not be exported outside the US
                     15:  * without license from the U.S. Commerce department.
                     16:  *
                     17:  * The key schedule is passed as an arg, as well as the cleartext or
                     18:  * ciphertext.  The cleartext and ciphertext should be in host order.
                     19:  *
                     20:  * These routines form the library interface to the des facilities.
                     21:  *
                     22:  * spm 8/85    MIT project athena
                     23:  */
                     24: 
                     25: #ifndef        lint
                     26: static char rcsid_random_key_c[] =
                     27: "$Header: random_key.c,v 4.8 89/01/21 16:50:39 jtkohl Exp $";
                     28: #endif lint
                     29: 
                     30: #include <mit-copyright.h>
                     31: #include <stdio.h>
                     32: 
                     33: #include <des.h>
                     34: #include "des_internal.h"
                     35: 
                     36: #ifdef BSDUNIX
                     37: #include <sys/time.h>
                     38: #endif
                     39: 
                     40: extern int des_debug;
                     41: extern int des_debug_print();
                     42: 
                     43: /* random_key */
                     44: int
                     45: des_random_key(key)
                     46:     des_cblock *key;
                     47: {
                     48:     /*
                     49:      * create a random des key; should force odd parity per byte;
                     50:      * parity is bits 8,16,...64 in des order, implies 0, 8, 16, ...
                     51:      * vax order
                     52:      */
                     53: 
                     54:     register unsigned int temp;
                     55:     register int odd;
                     56:     register unsigned char *c = (unsigned char *) key;
                     57:     unsigned long *k = (unsigned long *) key;
                     58:     static long p = 0;
                     59:     static long n = 0;
                     60:     long gethostid(), random();
                     61: 
                     62:     int i,j;
                     63: 
                     64: #ifdef BSDUNIX
                     65:     static struct timeval time;
                     66: 
                     67:     if (!p) {
                     68:        p = getpid();
                     69:        p ^= gethostid();
                     70:     }
                     71: 
                     72:     (void) gettimeofday(&time,(struct timezone *)0);
                     73:     /* randomize start */
                     74:     srandom(time.tv_usec ^ time.tv_sec ^ p ^ n++);
                     75: 
                     76:     *k++ = random();
                     77:     *k = random();
                     78: 
                     79:     /* make each byte parity odd */
                     80:     for (i = 0; i <= 7; i++) {
                     81:        odd = 0;
                     82:        temp = (unsigned int) *c;
                     83:        /* ignore bit 0, lsb,  it will be parity (on vax) */
                     84:        /* should do this with a table lookup */
                     85:        for (j = 0; j <= 6; j++) {
                     86:            temp = temp >> 1;
                     87:            odd ^= temp & 01;
                     88:        }
                     89:        /* set odd parity in lsb */
                     90:        if (!odd)
                     91:            *c |= 1;
                     92:        else
                     93:            *c &= ~1;
                     94:        c++;
                     95:     }
                     96: 
                     97:     /* **** */
                     98: #else
                     99:     dont know how to do random numbers for this machine;
                    100: #endif
                    101: 
                    102:     return 0;
                    103: }

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