Annotation of src/usr.bin/x99token/x99token.c, Revision 1.10
1.10 ! deraadt 1: /* $OpenBSD: x99token.c,v 1.9 2013/11/27 00:13:22 deraadt Exp $ */
1.6 millert 2:
1.1 millert 3: /*
4: * X9.9 calculator
5: * This software is provided AS IS with no express or implied warranty
6: * October 1995, Paul Borman <prb@krystal.com>
1.5 millert 7: *
8: * Donated to the Public Domain by Paul Borman
1.1 millert 9: */
1.10 ! deraadt 10:
1.2 millert 11: #include <sys/stat.h>
12:
13: #include <ctype.h>
14: #include <err.h>
1.1 millert 15: #include <pwd.h>
1.2 millert 16: #include <readpassphrase.h>
1.1 millert 17: #include <stdio.h>
18: #include <stdlib.h>
19: #include <string.h>
20: #include <unistd.h>
1.10 ! deraadt 21: #include <limits.h>
1.8 jsg 22: #include <openssl/des.h>
1.1 millert 23:
1.2 millert 24: #define KEYFILE ".keyfile.des"
1.1 millert 25: #define HEXDIGITS "0123456789abcdef"
26: #define DECDIGITS "0123456789012345"
27:
1.8 jsg 28: void predict(DES_key_schedule, const char *, int);
1.2 millert 29:
1.1 millert 30: char *digits = HEXDIGITS;
1.2 millert 31: extern char *__progname;
1.1 millert 32:
33: int
1.2 millert 34: main(int argc, char **argv)
1.1 millert 35: {
36: int i;
37: char buf[256];
1.8 jsg 38: DES_key_schedule ks;
39: DES_cblock key;
1.10 ! deraadt 40: char _keyfile[PATH_MAX];
1.1 millert 41: char *keyfile = 0;
42: FILE *fp;
43: int init = 0;
44: int hex = 1;
45: int cnt = 1;
1.2 millert 46: unsigned int pin;
1.1 millert 47: struct passwd *pwd;
48:
1.2 millert 49: while ((i = getopt(argc, argv, "dk:in:")) != -1) {
1.1 millert 50: switch (i) {
51: case 'k':
52: keyfile = optarg;
53: break;
54: case 'i':
55: init = 1;
56: break;
57: case 'd':
58: hex = 0;
59: break;
60: case 'n':
61: cnt = atoi(optarg);
1.2 millert 62: if (cnt <= 0)
63: err(1, "invalid count: %s", optarg);
1.1 millert 64: break;
65: default:
1.7 jmc 66: fprintf(stderr,
67: "usage: %s [-d] [-k keyfile] [-n count]\n"
68: " %s -i [-k keyfile]\n",
69: __progname, __progname);
1.1 millert 70: exit(1);
71: }
1.2 millert 72: }
1.1 millert 73:
74: if (!keyfile) {
1.2 millert 75: if ((pwd = getpwuid(getuid())) == NULL) {
1.1 millert 76: fprintf(stderr, "Say, just who are you, anyhow?\n");
77: exit(1);
78: }
1.2 millert 79: snprintf(_keyfile, sizeof(_keyfile), "%s/%s", pwd->pw_dir,
80: KEYFILE);
1.1 millert 81: keyfile = _keyfile;
82: }
83:
1.2 millert 84: if (init)
85: readpassphrase("Enter Key: ", buf, sizeof(buf), 0);
86: else if ((fp = fopen(keyfile, "r")) == NULL)
87: err(1, "unable to open %s", keyfile);
88: else {
1.1 millert 89: if (fgets(buf, sizeof(buf), fp) == NULL) {
90: fprintf(stderr, "No key in %s\n", keyfile);
91: exit(1);
92: }
93: fclose(fp);
94: }
95:
96: memset(key, 0, sizeof(key));
97: if (init && buf[3] == ' ') {
98: char *b = buf;
99: /* Assume octal input */
100: for (i = 0; i < 8; ++i) {
1.4 millert 101: if (!*b)
1.1 millert 102: fprintf(stderr, "%s: invalid key\n", buf);
1.9 deraadt 103: while (isdigit((unsigned char)*b))
1.4 millert 104: key[i] = key[i] << 3 | (*b++ - '0');
1.9 deraadt 105: while (*b && !isdigit((unsigned char)*b))
1.1 millert 106: ++b;
107: }
1.2 millert 108: } else {
1.1 millert 109: for (i = 0; i < 16; ++i) {
110: int d;
111:
1.9 deraadt 112: if (islower((unsigned char)buf[i]))
113: buf[i] = toupper((unsigned char)buf[i]);
1.1 millert 114: if (buf[i] >= '0' && buf[i] <= '9')
115: d = buf[i] - '0';
116: else if (buf[i] >= 'A' && buf[i] <= 'F')
117: d = buf[i] - 'A' + 10;
118: else {
119: fprintf(stderr, "invalid key: %s\n", buf);
120: exit(1);
121: }
122: key[i>>1] |= d << ((i & 1) ? 0 : 4);
123: }
1.2 millert 124: }
1.1 millert 125:
1.2 millert 126: /* XXX - should warn on non-space or non-digit */
127: readpassphrase("Enter Pin: ", buf, sizeof(buf), 0);
128: for (i = 0, pin = 0; buf[i] && buf[i] != '\n'; ++i)
1.9 deraadt 129: if (isdigit((unsigned char)buf[i]))
1.1 millert 130: pin = pin * 16 + buf[i] - '0' + 1;
131:
1.2 millert 132: if ((pin & 0xffff0000) == 0)
1.1 millert 133: pin |= pin << 16;
134:
135: for (i = 0; i < 8; ++i)
136: key[0] ^= (pin >> ((i * 7) % 26)) & 0x7f;
137:
138: if (init) {
1.2 millert 139: if ((fp = fopen(keyfile, "w")) == NULL)
140: err(1, "could not open %s for writing", keyfile);
141: fchmod(fileno(fp), 0600);
1.1 millert 142: for (i = 0; i < 8; ++i) {
143: fprintf(fp, "%c", digits[(key[i]>>4)&0xf]);
144: fprintf(fp, "%c", digits[(key[i]>>0)&0xf]);
145: }
1.2 millert 146: fputc('\n', fp);
1.1 millert 147: fclose(fp);
148: exit(0);
149: }
150:
1.8 jsg 151: DES_fixup_key_parity(&key);
152: DES_key_sched(&key, &ks);
1.1 millert 153:
1.2 millert 154: buf[0] = '\0';
1.3 deraadt 155: readpassphrase("Enter challenge: ", buf, sizeof(buf), RPP_ECHO_ON);
1.2 millert 156: if (buf[0] == '\0')
1.1 millert 157: exit(0);
158:
159: for (i = 0; i < 8; ++i)
160: if (buf[i] == '\n')
161: buf[i] = '\0';
162:
163: if (!hex)
164: digits = DECDIGITS;
165:
166: predict(ks, buf, cnt);
167:
1.2 millert 168: memset(&ks, 0, sizeof(ks));
169: memset(buf, 0, sizeof(buf));
170:
1.1 millert 171: exit(0);
172: }
173:
174: void
1.8 jsg 175: predict(DES_key_schedule ks, const char *chal, int cnt)
1.1 millert 176: {
177: int i;
1.8 jsg 178: DES_cblock cb;
1.1 millert 179:
1.4 millert 180: memcpy(&cb, chal, sizeof(cb));
1.1 millert 181: while (cnt-- > 0) {
1.4 millert 182: printf("%.8s: ", (char *)cb);
1.8 jsg 183: DES_ecb_encrypt(&cb, &cb, &ks, DES_ENCRYPT);
1.1 millert 184: for (i = 0; i < 4; ++i) {
1.2 millert 185: printf("%c", digits[(cb[i]>>4) & 0xf]);
186: printf("%c", digits[(cb[i]>>0) & 0xf]);
1.1 millert 187: }
1.2 millert 188: putchar('\n');
1.1 millert 189: for (i = 0; i < 8; ++i) {
1.2 millert 190: if ((cb[i] &= 0xf) > 9)
191: cb[i] -= 10;
192: cb[i] |= 0x30;
1.1 millert 193: }
194: }
1.2 millert 195: memset(&cb, 0, sizeof(cb));
1.1 millert 196: }
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