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/* $OpenBSD: x99token.c,v 1.9 2013/11/27 00:13:22 deraadt Exp $ */
/*
* X9.9 calculator
* This software is provided AS IS with no express or implied warranty
* October 1995, Paul Borman <prb@krystal.com>
*
* Donated to the Public Domain by Paul Borman
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <ctype.h>
#include <err.h>
#include <pwd.h>
#include <readpassphrase.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <openssl/des.h>
#define KEYFILE ".keyfile.des"
#define HEXDIGITS "0123456789abcdef"
#define DECDIGITS "0123456789012345"
void predict(DES_key_schedule, const char *, int);
char *digits = HEXDIGITS;
extern char *__progname;
int
main(int argc, char **argv)
{
int i;
char buf[256];
DES_key_schedule ks;
DES_cblock key;
char _keyfile[MAXPATHLEN];
char *keyfile = 0;
FILE *fp;
int init = 0;
int hex = 1;
int cnt = 1;
unsigned int pin;
struct passwd *pwd;
while ((i = getopt(argc, argv, "dk:in:")) != -1) {
switch (i) {
case 'k':
keyfile = optarg;
break;
case 'i':
init = 1;
break;
case 'd':
hex = 0;
break;
case 'n':
cnt = atoi(optarg);
if (cnt <= 0)
err(1, "invalid count: %s", optarg);
break;
default:
fprintf(stderr,
"usage: %s [-d] [-k keyfile] [-n count]\n"
" %s -i [-k keyfile]\n",
__progname, __progname);
exit(1);
}
}
if (!keyfile) {
if ((pwd = getpwuid(getuid())) == NULL) {
fprintf(stderr, "Say, just who are you, anyhow?\n");
exit(1);
}
snprintf(_keyfile, sizeof(_keyfile), "%s/%s", pwd->pw_dir,
KEYFILE);
keyfile = _keyfile;
}
if (init)
readpassphrase("Enter Key: ", buf, sizeof(buf), 0);
else if ((fp = fopen(keyfile, "r")) == NULL)
err(1, "unable to open %s", keyfile);
else {
if (fgets(buf, sizeof(buf), fp) == NULL) {
fprintf(stderr, "No key in %s\n", keyfile);
exit(1);
}
fclose(fp);
}
memset(key, 0, sizeof(key));
if (init && buf[3] == ' ') {
char *b = buf;
/* Assume octal input */
for (i = 0; i < 8; ++i) {
if (!*b)
fprintf(stderr, "%s: invalid key\n", buf);
while (isdigit((unsigned char)*b))
key[i] = key[i] << 3 | (*b++ - '0');
while (*b && !isdigit((unsigned char)*b))
++b;
}
} else {
for (i = 0; i < 16; ++i) {
int d;
if (islower((unsigned char)buf[i]))
buf[i] = toupper((unsigned char)buf[i]);
if (buf[i] >= '0' && buf[i] <= '9')
d = buf[i] - '0';
else if (buf[i] >= 'A' && buf[i] <= 'F')
d = buf[i] - 'A' + 10;
else {
fprintf(stderr, "invalid key: %s\n", buf);
exit(1);
}
key[i>>1] |= d << ((i & 1) ? 0 : 4);
}
}
/* XXX - should warn on non-space or non-digit */
readpassphrase("Enter Pin: ", buf, sizeof(buf), 0);
for (i = 0, pin = 0; buf[i] && buf[i] != '\n'; ++i)
if (isdigit((unsigned char)buf[i]))
pin = pin * 16 + buf[i] - '0' + 1;
if ((pin & 0xffff0000) == 0)
pin |= pin << 16;
for (i = 0; i < 8; ++i)
key[0] ^= (pin >> ((i * 7) % 26)) & 0x7f;
if (init) {
if ((fp = fopen(keyfile, "w")) == NULL)
err(1, "could not open %s for writing", keyfile);
fchmod(fileno(fp), 0600);
for (i = 0; i < 8; ++i) {
fprintf(fp, "%c", digits[(key[i]>>4)&0xf]);
fprintf(fp, "%c", digits[(key[i]>>0)&0xf]);
}
fputc('\n', fp);
fclose(fp);
exit(0);
}
DES_fixup_key_parity(&key);
DES_key_sched(&key, &ks);
buf[0] = '\0';
readpassphrase("Enter challenge: ", buf, sizeof(buf), RPP_ECHO_ON);
if (buf[0] == '\0')
exit(0);
for (i = 0; i < 8; ++i)
if (buf[i] == '\n')
buf[i] = '\0';
if (!hex)
digits = DECDIGITS;
predict(ks, buf, cnt);
memset(&ks, 0, sizeof(ks));
memset(buf, 0, sizeof(buf));
exit(0);
}
void
predict(DES_key_schedule ks, const char *chal, int cnt)
{
int i;
DES_cblock cb;
memcpy(&cb, chal, sizeof(cb));
while (cnt-- > 0) {
printf("%.8s: ", (char *)cb);
DES_ecb_encrypt(&cb, &cb, &ks, DES_ENCRYPT);
for (i = 0; i < 4; ++i) {
printf("%c", digits[(cb[i]>>4) & 0xf]);
printf("%c", digits[(cb[i]>>0) & 0xf]);
}
putchar('\n');
for (i = 0; i < 8; ++i) {
if ((cb[i] &= 0xf) > 9)
cb[i] -= 10;
cb[i] |= 0x30;
}
}
memset(&cb, 0, sizeof(cb));
}
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