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

1.1       root        1: /*
                      2:  * $Source: /mit/kerberos/src/lib/des/RCS/make_ip.c,v $
                      3:  * $Author: jtkohl $
                      4:  *
                      5:  * Copyright 1987, 1988 by the Massachusetts Institute of Technology.
                      6:  *
                      7:  * For copying and distribution information, please see the file
                      8:  * <mit-copyright.h>.
                      9:  *
                     10:  * This routine generates source code implementing the initial
                     11:  * permutation of the DES.
                     12:  */
                     13: 
                     14: #include <mit-copyright.h>
                     15: #include <stdio.h>
                     16: #include "des_internal.h"
                     17: #include "tables.h"
                     18: 
                     19: extern long swap_bit_pos_0();
                     20: extern long rev_swap_bit_pos_0();
                     21: 
                     22: #define SWAP(x) swap_long_bytes_bit_number(swap_bit_pos_0_to_ansi(x))
                     23: 
                     24: void gen(stream)
                     25:     FILE *stream;
                     26: {
                     27:     register i;
                     28: 
                     29:     /* clear the output */
                     30:     fprintf(stream,"    L2 = 0; R2 = 0;\n");
                     31: 
                     32:     /* first setup IP */
                     33:     fprintf(stream,"/* IP operations */\n/* first left to left */\n");
                     34: 
                     35:     /* first list mapping from left to left */
                     36:     for (i = 0; i <= 31; i++)
                     37:         if (IP[i] < 32)
                     38:             test_set(stream, "L1", SWAP(IP[i]), "L2", i);
                     39: 
                     40:     /* now mapping from right to left */
                     41:     fprintf(stream,"\n/* now from right to left */\n");
                     42:     for (i = 0; i <= 31; i++)
                     43:         if (IP[i] >= 32)
                     44:             test_set(stream, "R1", SWAP(IP[i]-32), "L2", i);
                     45: 
                     46:     fprintf(stream,"\n/* now from left to right */\n");
                     47:     /*  list mapping from left to right */
                     48:     for (i = 32; i <= 63; i++)
                     49:         if (IP[i] <32)
                     50:             test_set(stream, "L1", SWAP(IP[i]), "R2", i-32);
                     51: 
                     52:     /* now mapping from right to right */
                     53:     fprintf(stream,"\n/* last from right to right */\n");
                     54:     for (i = 32; i <= 63; i++)
                     55:         if (IP[i] >= 32)
                     56:             test_set(stream, "R1", SWAP(IP[i]-32), "R2", i-32);
                     57:     exit(0);
                     58: }

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