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/*
* $Source$
* $Author$
*
* Copyright 1987, 1988,1990 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* For copying and distribution information, please see the file
* <krb5/copyright.h>.
*
* This routine generates source code implementing the initial
* permutation of the DES.
*/
#if !defined(lint) && !defined(SABER)
static char rcsid_make_ip_c[] =
"$Id$";
#endif /* !lint & !SABER */
#include <krb5/krb5.h>
#include <stdio.h>
#include "des_int.h"
#include "tables.h"
#define SWAP(x) swap_long_bytes_bit_number(swap_bit_pos_0_to_ansi(x))
void gen(stream)
FILE *stream;
{
register i;
/* clear the output */
fprintf(stream," L2 = 0; R2 = 0;\n");
/* first setup IP */
fprintf(stream,"/* IP operations */\n/* first left to left */\n");
/* first list mapping from left to left */
for (i = 0; i <= 31; i++)
if (IP[i] < 32)
test_set(stream, "L1", SWAP(IP[i]), "L2", i);
/* now mapping from right to left */
fprintf(stream,"\n/* now from right to left */\n");
for (i = 0; i <= 31; i++)
if (IP[i] >= 32)
test_set(stream, "R1", SWAP(IP[i]-32), "L2", i);
fprintf(stream,"\n/* now from left to right */\n");
/* list mapping from left to right */
for (i = 32; i <= 63; i++)
if (IP[i] <32)
test_set(stream, "L1", SWAP(IP[i]), "R2", i-32);
/* now mapping from right to right */
fprintf(stream,"\n/* last from right to right */\n");
for (i = 32; i <= 63; i++)
if (IP[i] >= 32)
test_set(stream, "R1", SWAP(IP[i]-32), "R2", i-32);
exit(0);
}
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