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/* makePC2.c,v 3.1 1993/07/06 01:05:01 jbj Exp
* makePC2 - build custom permutted choice 2 tables
*/
#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 permc P((u_char *, U_LONG *));
static void permd P((u_char *, U_LONG *));
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);
}
/*
* Permuted choice 2 table. This actually produces the low order 24
* bits of the subkey Ki from the 28 bit value of Ci. This has had
* 1 subtracted from it to give a zero base.
*/
static u_char PC2_C[24] = {
13, 16, 10, 23, 0, 4,
2, 27, 14, 5, 20, 9,
22, 18, 11, 3, 25, 7,
15, 6, 26, 19, 12, 1
};
/*
* Permuted choice 2 table, operating on the 28 Di bits to produce the
* high order 24 bits of subkey Ki. This has had 29 subtracted from
* it to give it a zero base into our D bit array.
*/
static u_char PC2_D[24] = {
12, 23, 2, 8, 18, 26,
1, 11, 22, 16, 4, 19,
15, 20, 10, 27, 5, 24,
17, 13, 21, 7, 0, 3
};
U_LONG masks[4] = { 0x40000000, 0x400000, 0x4000, 0x40 };
/*
* permc - permute C, producing a four byte result
*/
static void
permc(bits, resp)
u_char *bits;
U_LONG *resp;
{
register int part;
register int i;
register U_LONG mask;
u_char res[24];
memset((char *)res, 0, sizeof res);
for (i = 0; i < 24; i++) {
res[i] = bits[PC2_C[i]];
}
*resp = 0;
for (part = 0; part < 4; part++) {
mask = masks[part];
for (i = part*6; i < (part+1)*6; i++) {
mask >>= 1;
if (res[i])
*resp |= mask;
}
}
}
/*
* permd - permute D, producing a four byte result
*/
static void
permd(bits, resp)
u_char *bits;
U_LONG *resp;
{
register int part;
register int i;
register U_LONG mask;
u_char res[24];
memset((char *)res, 0, sizeof res);
for (i = 0; i < 24; i++) {
res[i] = bits[PC2_D[i]];
}
*resp = 0;
for (part = 0; part < 4; part++) {
mask = masks[part];
for (i = part*6; i < (part+1)*6; i++) {
mask >>= 1;
if (res[i])
*resp |= mask;
}
}
}
/*
* bits used for each round in C
*/
static int cbits[4][6] = {
0, 1, 2, 3, 4, 5,
6, 7, 9, 10, 11, 12,
13, 14, 15, 16, 22, 23,
18, 19, 20, 25, 26, 27
};
/*
* bits used for each round in D
*/
static int dbits[4][6] = {
0, 1, 2, 3, 4, 5,
7, 8, 10, 11, 12, 13,
15, 16, 17, 18, 19, 20,
21, 22, 23, 24, 26, 27
};
/*
* doit - compute and print the four PC1 tables
*/
static void
doit()
{
int i;
int comb;
U_LONG res;
u_char bits[28];
memset((char *)bits, 0, sizeof bits);
printf("static U_LONG PC2_C[4][64] = {");
for (i = 0; i < 4; i++) {
for (comb = 0; comb < 64; comb++) {
if (comb & 0x20)
bits[cbits[i][0]] = 1;
if (comb & 0x10)
bits[cbits[i][1]] = 1;
if (comb & 0x8)
bits[cbits[i][2]] = 1;
if (comb & 0x4)
bits[cbits[i][3]] = 1;
if (comb & 0x2)
bits[cbits[i][4]] = 1;
if (comb & 0x1)
bits[cbits[i][5]] = 1;
permc(bits, &res);
bits[cbits[i][0]] = 0;
bits[cbits[i][1]] = 0;
bits[cbits[i][2]] = 0;
bits[cbits[i][3]] = 0;
bits[cbits[i][4]] = 0;
bits[cbits[i][5]] = 0;
if ((comb & 0x3) == 0)
printf("\n\t0x%08x,", res);
else if (comb == 63 && i == 3)
printf(" 0x%08x\n};\n\n", res);
else if (comb == 63)
printf(" 0x%08x,\n", res);
else
printf(" 0x%08x,", res);
}
}
printf("static U_LONG PC2_D[4][64] = {");
for (i = 0; i < 4; i++) {
for (comb = 0; comb < 64; comb++) {
if (comb & 0x20)
bits[dbits[i][0]] = 1;
if (comb & 0x10)
bits[dbits[i][1]] = 1;
if (comb & 0x8)
bits[dbits[i][2]] = 1;
if (comb & 0x4)
bits[dbits[i][3]] = 1;
if (comb & 0x2)
bits[dbits[i][4]] = 1;
if (comb & 0x1)
bits[dbits[i][5]] = 1;
permd(bits, &res);
bits[dbits[i][0]] = 0;
bits[dbits[i][1]] = 0;
bits[dbits[i][2]] = 0;
bits[dbits[i][3]] = 0;
bits[dbits[i][4]] = 0;
bits[dbits[i][5]] = 0;
if ((comb & 0x3) == 0)
printf("\n\t0x%08x,", res);
else if (comb == 63 && i == 3)
printf(" 0x%08x\n};\n\n", res);
else if (comb == 63)
printf(" 0x%08x,\n", res);
else
printf(" 0x%08x,", res);
}
}
}
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