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Annotation of 43BSDReno/kerberosIV/make_odd/make_odd.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * $Source: /mit/kerberos/src/lib/des/RCS/make_odd.c,v $
                      3:  * $Author: steiner $
                      4:  *
                      5:  * Copyright 1988 by the Massachusetts Institute of Technology.
                      6:  *
                      7:  * For copying and distribution information, please see
                      8:  * the file <mit-copyright.h>.
                      9:  *
                     10:  * This routine generates an odd-parity table for use in key generation.
                     11:  */
                     12: 
                     13: #include <mit-copyright.h>
                     14: #include <stdio.h>
                     15: 
                     16: void gen(stream)
                     17:     FILE *stream;
                     18: {
                     19:     /*
                     20:      * map a byte into its equivalent with odd parity, where odd
                     21:      * parity is in the least significant bit
                     22:      */
                     23:     register i, j, k, odd;
                     24: 
                     25:     fprintf(stream,
                     26:             "static unsigned char const odd_parity[256] = {\n");
                     27: 
                     28:     for (i = 0; i < 256; i++) {
                     29:         odd = 0;
                     30:         /* shift out the lsb parity bit */
                     31:         k = i >> 1;
                     32:         /* then count the other bits */
                     33:         for (j = 0; j < 7; j++) {
                     34:             odd ^= (k&1);
                     35:             k = k >> 1;
                     36:         }
                     37:         k = i&~1;
                     38:         if (!odd)
                     39:             k |= 1;
                     40:         fprintf(stream, "%3d", k);
                     41:         if (i < 255)
                     42:             fprintf(stream, ", ");
                     43:         if (i%8 == 0)
                     44:             fprintf(stream, "\n");
                     45:     }
                     46:     fprintf(stream, "};\n");
                     47: }

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