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/*
* makePC1 - build custom permutted choice 1 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 permute P((u_char *, u_long *, 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 1 table, to produce the initial C. This table
* has had 1 subtracted from it to give it a zero base.
*/
static u_char PC1_C[28] = {
56, 48, 40, 32, 24, 16, 8,
0, 57, 49, 41, 33, 25, 17,
9, 1, 58, 50, 42, 34, 26,
18, 10, 2, 59, 51, 43, 35
};
/*
* Permuted choice 1 table, to produce the initial D. Again, 1 has
* been subtracted to match C language zero base arrays.
*/
static u_char PC1_D[28] = {
62, 54, 46, 38, 30, 22, 14,
6, 61, 53, 45, 37, 29, 21,
13, 5, 60, 52, 44, 36, 28,
20, 12, 4, 27, 19, 11, 3
};
/*
* permute - produce c and d for the given bits
*/
static void
permute(bits, cp, dp)
u_char *bits;
u_long *cp;
u_long *dp;
{
register int i;
register u_long mask;
u_char c[28];
u_char d[28];
memset((char *)c, 0, sizeof c);
memset((char *)d, 0, sizeof d);
for (i = 0; i < 28; i++) {
c[i] = bits[PC1_C[i]];
d[i] = bits[PC1_D[i]];
}
mask = 0x10000000;
*cp = *dp = 0;
for (i = 0; i < 28; i++) {
mask >>= 1;
if (c[i])
*cp |= mask;
if (d[i])
*dp |= mask;
}
}
/*
* bits from the left part of the key used to form the C subkey
*/
static int lc3[4] = { 0, 8, 16, 24 };
/*
* bits from the left part of the key used to form the D subkey
*/
static int ld4[4] = { 3, 11, 19, 27 };
/*
* bits from the right part of the key used to form the C subkey
*/
static int rc4[4] = { 32, 40, 48, 56 };
/*
* bits from the right part of the key used to form the D subkey
*/
static int rd3[4] = { 36, 44, 52, 60 };
static u_long PC_CL[8];
static u_long PC_DL[16];
static u_long PC_CR[16];
static u_long PC_DR[8];
/*
* doit - compute and print the four PC1 tables
*/
static void
doit()
{
int i;
int comb;
u_long c;
u_long d;
u_char bits[64];
memset((char *)bits, 0, sizeof bits);
printf("static u_long PC1_CL[8] = {");
for (i = 0; i < 4; i++) {
for (comb = 0; comb < 8; comb++) {
if (comb & 0x4)
bits[lc3[i]] = 1;
if (comb & 0x2)
bits[lc3[i]+1] = 1;
if (comb & 0x1)
bits[lc3[i]+2] = 1;
permute(bits, &c, &d);
bits[lc3[i]] = 0;
bits[lc3[i]+1] = 0;
bits[lc3[i]+2] = 0;
if (d != 0) {
(void) fprintf(stderr,
"Error PC_CL i %d comb %d\n", i, comb);
}
if (i == 0) {
PC_CL[comb] = c;
if ((comb & 0x3) == 0)
printf("\n\t0x%08x,", c);
else if (comb == 7)
printf(" 0x%08x\n};\n\n", c);
else
printf(" 0x%08x,", c);
} else {
if (c != PC_CL[comb] << i)
(void) fprintf(stderr,
"Error PC_CL 0x%08x c 0x%08x\n",
PC_CL[comb], c);
}
}
}
printf("static u_long PC1_DL[16] = {");
for (i = 0; i < 4; i++) {
for (comb = 0; comb < 16; comb++) {
if (comb & 0x8)
bits[ld4[i]] = 1;
if (comb & 0x4)
bits[ld4[i]+1] = 1;
if (comb & 0x2)
bits[ld4[i]+2] = 1;
if (comb & 0x1)
bits[ld4[i]+3] = 1;
permute(bits, &c, &d);
bits[ld4[i]] = 0;
bits[ld4[i]+1] = 0;
bits[ld4[i]+2] = 0;
bits[ld4[i]+3] = 0;
if (c != 0) {
(void) fprintf(stderr,
"Error PC_DL i %d comb %d\n", i, comb);
}
if (i == 0) {
PC_DL[comb] = d;
if ((comb & 0x3) == 0)
printf("\n\t0x%08x,", d);
else if (comb == 15)
printf(" 0x%08x\n};\n\n", d);
else
printf(" 0x%08x,", d);
} else {
if (d != PC_DL[comb] << i)
(void) fprintf(stderr,
"Error PC_DL 0x%08x c 0x%08x\n",
PC_DL[comb], d);
}
}
}
printf("static u_long PC1_CR[16] = {");
for (i = 0; i < 4; i++) {
for (comb = 0; comb < 16; comb++) {
if (comb & 0x8)
bits[rc4[i]] = 1;
if (comb & 0x4)
bits[rc4[i]+1] = 1;
if (comb & 0x2)
bits[rc4[i]+2] = 1;
if (comb & 0x1)
bits[rc4[i]+3] = 1;
permute(bits, &c, &d);
bits[rc4[i]] = 0;
bits[rc4[i]+1] = 0;
bits[rc4[i]+2] = 0;
bits[rc4[i]+3] = 0;
if (d != 0) {
(void) fprintf(stderr,
"Error PC_CR i %d comb %d\n", i, comb);
}
if (i == 0) {
PC_CR[comb] = c;
if ((comb & 0x3) == 0)
printf("\n\t0x%08x,", c);
else if (comb == 15)
printf(" 0x%08x\n};\n\n", c);
else
printf(" 0x%08x,", c);
} else {
if (c != PC_CR[comb] << i)
(void) fprintf(stderr,
"Error PC_CR 0x%08x c 0x%08x\n",
PC_CR[comb], c);
}
}
}
printf("static u_long PC1_DR[8] = {");
for (i = 0; i < 4; i++) {
for (comb = 0; comb < 8; comb++) {
if (comb & 0x4)
bits[rd3[i]] = 1;
if (comb & 0x2)
bits[rd3[i]+1] = 1;
if (comb & 0x1)
bits[rd3[i]+2] = 1;
permute(bits, &c, &d);
bits[rd3[i]] = 0;
bits[rd3[i]+1] = 0;
bits[rd3[i]+2] = 0;
if (c != 0) {
(void) fprintf(stderr,
"Error PC_DR i %d comb %d\n", i, comb);
}
if (i == 0) {
PC_DR[comb] = d;
if ((comb & 0x3) == 0)
printf("\n\t0x%08x,", d);
else if (comb == 7)
printf(" 0x%08x\n};\n\n", d);
else
printf(" 0x%08x,", d);
} else {
if (d != PC_DR[comb] << i)
(void) fprintf(stderr,
"Error PC_DR 0x%08x c 0x%08x\n",
PC_DR[comb], d);
}
}
}
}
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