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/*
* makeSP - build combination S and P tables for quick DES computation
*/
#include <stdio.h>
#include <sys/types.h>
#include "ntp_stdlib.h"
#define STREQ(a, b) (*(a) == *(b) && strcmp((a), (b)) == 0)
char *progname;
int debug;
static void selperm P((int, int, u_int32 *));
static void doit P((void));
/*
* main - parse arguments and handle options
*/
void
main(argc, argv)
int argc;
char *argv[];
{
int c;
int errflg = 0;
extern int ntp_optind;
extern char *ntp_optarg;
progname = argv[0];
while ((c = ntp_getopt(argc, argv, "d")) != EOF)
switch (c) {
case 'd':
++debug;
break;
default:
errflg++;
break;
}
if (errflg) {
(void) fprintf(stderr, "usage: %s [-d]\n", progname);
exit(2);
}
doit();
exit(0);
}
/*
* The cipher selection function tables. These turn 6 bit data back
* into 4 bit data.
*/
u_char S[8][64] = {
14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,
4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,
15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13,
15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,
13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9,
10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,
13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,
13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,
1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12,
7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,
13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,
10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,
3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14,
2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,
14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,
4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,
11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3,
12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,
10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,
9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,
4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13,
4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,
13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,
1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,
6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12,
13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,
1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,
7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,
2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11
};
/*
* Cipher function permutation table
*/
u_char PT[32] = {
16, 7, 20, 21,
29, 12, 28, 17,
1, 15, 23, 26,
5, 18, 31, 10,
2, 8, 24, 14,
32, 27, 3, 9,
19, 13, 30, 6,
22, 11, 4, 25
};
/*
* Bits array. We keep this zeroed.
*/
u_char bits[32];
/*
* selperm - run six bit data through the given selection table, then
* through the PT table to produce a long output.
*/
static void
selperm(selnumber, sixbits, resp)
int selnumber;
int sixbits;
u_int32 *resp;
{
register u_int32 res;
register int selno;
register int i;
register int ind;
selno = selnumber;
i = sixbits;
ind = (i & 0x20) | ((i >> 1) & 0xf) | ((i & 0x1) << 4);
i = S[selno][ind];
for (ind = 0; ind < 4; ind++) {
if (i & 0x8)
bits[4*selno + ind] = 1;
i <<= 1;
}
res = 0;
for (i = 0; i < 32; i++) {
res <<= 1;
if (bits[PT[i]-1])
res |= 1;
}
*resp = res;
bits[4*selno] = 0;
bits[4*selno + 1] = 0;
bits[4*selno + 2] = 0;
bits[4*selno + 3] = 0;
}
/*
* doit - compute and print the 8 SP tables
*/
static void
doit()
{
int selno;
u_int32 result;
int sixbits;
memset((char *)bits, 0, sizeof bits);
printf("static u_int32 SP[8][64] = {");
for (selno = 0; selno < 8; selno++) {
for (sixbits = 0; sixbits < 64; sixbits++) {
selperm(selno, sixbits, &result);
if ((sixbits & 0x3) == 0)
printf("\n\t0x%08x,", result);
else if (sixbits == 63 && selno == 7)
printf(" 0x%08x\n};\n", result);
else if (sixbits == 63)
printf(" 0x%08x,\n", result);
else
printf(" 0x%08x,", result);
}
}
}
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