Annotation of src/usr.bin/x99token/x99token.c, Revision 1.9
1.9 ! deraadt 1: /* $OpenBSD: x99token.c,v 1.8 2010/10/15 10:18:42 jsg 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: */
1.2 millert 10: #include <sys/param.h>
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>
1.8 jsg 21: #include <openssl/des.h>
1.1 millert 22:
1.2 millert 23: #define KEYFILE ".keyfile.des"
1.1 millert 24: #define HEXDIGITS "0123456789abcdef"
25: #define DECDIGITS "0123456789012345"
26:
1.8 jsg 27: void predict(DES_key_schedule, const char *, int);
1.2 millert 28:
1.1 millert 29: char *digits = HEXDIGITS;
1.2 millert 30: extern char *__progname;
1.1 millert 31:
32: int
1.2 millert 33: main(int argc, char **argv)
1.1 millert 34: {
35: int i;
36: char buf[256];
1.8 jsg 37: DES_key_schedule ks;
38: DES_cblock key;
1.2 millert 39: char _keyfile[MAXPATHLEN];
1.1 millert 40: char *keyfile = 0;
41: FILE *fp;
42: int init = 0;
43: int hex = 1;
44: int cnt = 1;
1.2 millert 45: unsigned int pin;
1.1 millert 46: struct passwd *pwd;
47:
1.2 millert 48: while ((i = getopt(argc, argv, "dk:in:")) != -1) {
1.1 millert 49: switch (i) {
50: case 'k':
51: keyfile = optarg;
52: break;
53: case 'i':
54: init = 1;
55: break;
56: case 'd':
57: hex = 0;
58: break;
59: case 'n':
60: cnt = atoi(optarg);
1.2 millert 61: if (cnt <= 0)
62: err(1, "invalid count: %s", optarg);
1.1 millert 63: break;
64: default:
1.7 jmc 65: fprintf(stderr,
66: "usage: %s [-d] [-k keyfile] [-n count]\n"
67: " %s -i [-k keyfile]\n",
68: __progname, __progname);
1.1 millert 69: exit(1);
70: }
1.2 millert 71: }
1.1 millert 72:
73: if (!keyfile) {
1.2 millert 74: if ((pwd = getpwuid(getuid())) == NULL) {
1.1 millert 75: fprintf(stderr, "Say, just who are you, anyhow?\n");
76: exit(1);
77: }
1.2 millert 78: snprintf(_keyfile, sizeof(_keyfile), "%s/%s", pwd->pw_dir,
79: KEYFILE);
1.1 millert 80: keyfile = _keyfile;
81: }
82:
1.2 millert 83: if (init)
84: readpassphrase("Enter Key: ", buf, sizeof(buf), 0);
85: else if ((fp = fopen(keyfile, "r")) == NULL)
86: err(1, "unable to open %s", keyfile);
87: else {
1.1 millert 88: if (fgets(buf, sizeof(buf), fp) == NULL) {
89: fprintf(stderr, "No key in %s\n", keyfile);
90: exit(1);
91: }
92: fclose(fp);
93: }
94:
95: memset(key, 0, sizeof(key));
96: if (init && buf[3] == ' ') {
97: char *b = buf;
98: /* Assume octal input */
99: for (i = 0; i < 8; ++i) {
1.4 millert 100: if (!*b)
1.1 millert 101: fprintf(stderr, "%s: invalid key\n", buf);
1.9 ! deraadt 102: while (isdigit((unsigned char)*b))
1.4 millert 103: key[i] = key[i] << 3 | (*b++ - '0');
1.9 ! deraadt 104: while (*b && !isdigit((unsigned char)*b))
1.1 millert 105: ++b;
106: }
1.2 millert 107: } else {
1.1 millert 108: for (i = 0; i < 16; ++i) {
109: int d;
110:
1.9 ! deraadt 111: if (islower((unsigned char)buf[i]))
! 112: buf[i] = toupper((unsigned char)buf[i]);
1.1 millert 113: if (buf[i] >= '0' && buf[i] <= '9')
114: d = buf[i] - '0';
115: else if (buf[i] >= 'A' && buf[i] <= 'F')
116: d = buf[i] - 'A' + 10;
117: else {
118: fprintf(stderr, "invalid key: %s\n", buf);
119: exit(1);
120: }
121: key[i>>1] |= d << ((i & 1) ? 0 : 4);
122: }
1.2 millert 123: }
1.1 millert 124:
1.2 millert 125: /* XXX - should warn on non-space or non-digit */
126: readpassphrase("Enter Pin: ", buf, sizeof(buf), 0);
127: for (i = 0, pin = 0; buf[i] && buf[i] != '\n'; ++i)
1.9 ! deraadt 128: if (isdigit((unsigned char)buf[i]))
1.1 millert 129: pin = pin * 16 + buf[i] - '0' + 1;
130:
1.2 millert 131: if ((pin & 0xffff0000) == 0)
1.1 millert 132: pin |= pin << 16;
133:
134: for (i = 0; i < 8; ++i)
135: key[0] ^= (pin >> ((i * 7) % 26)) & 0x7f;
136:
137: if (init) {
1.2 millert 138: if ((fp = fopen(keyfile, "w")) == NULL)
139: err(1, "could not open %s for writing", keyfile);
140: fchmod(fileno(fp), 0600);
1.1 millert 141: for (i = 0; i < 8; ++i) {
142: fprintf(fp, "%c", digits[(key[i]>>4)&0xf]);
143: fprintf(fp, "%c", digits[(key[i]>>0)&0xf]);
144: }
1.2 millert 145: fputc('\n', fp);
1.1 millert 146: fclose(fp);
147: exit(0);
148: }
149:
1.8 jsg 150: DES_fixup_key_parity(&key);
151: DES_key_sched(&key, &ks);
1.1 millert 152:
1.2 millert 153: buf[0] = '\0';
1.3 deraadt 154: readpassphrase("Enter challenge: ", buf, sizeof(buf), RPP_ECHO_ON);
1.2 millert 155: if (buf[0] == '\0')
1.1 millert 156: exit(0);
157:
158: for (i = 0; i < 8; ++i)
159: if (buf[i] == '\n')
160: buf[i] = '\0';
161:
162: if (!hex)
163: digits = DECDIGITS;
164:
165: predict(ks, buf, cnt);
166:
1.2 millert 167: memset(&ks, 0, sizeof(ks));
168: memset(buf, 0, sizeof(buf));
169:
1.1 millert 170: exit(0);
171: }
172:
173: void
1.8 jsg 174: predict(DES_key_schedule ks, const char *chal, int cnt)
1.1 millert 175: {
176: int i;
1.8 jsg 177: DES_cblock cb;
1.1 millert 178:
1.4 millert 179: memcpy(&cb, chal, sizeof(cb));
1.1 millert 180: while (cnt-- > 0) {
1.4 millert 181: printf("%.8s: ", (char *)cb);
1.8 jsg 182: DES_ecb_encrypt(&cb, &cb, &ks, DES_ENCRYPT);
1.1 millert 183: for (i = 0; i < 4; ++i) {
1.2 millert 184: printf("%c", digits[(cb[i]>>4) & 0xf]);
185: printf("%c", digits[(cb[i]>>0) & 0xf]);
1.1 millert 186: }
1.2 millert 187: putchar('\n');
1.1 millert 188: for (i = 0; i < 8; ++i) {
1.2 millert 189: if ((cb[i] &= 0xf) > 9)
190: cb[i] -= 10;
191: cb[i] |= 0x30;
1.1 millert 192: }
193: }
1.2 millert 194: memset(&cb, 0, sizeof(cb));
1.1 millert 195: }
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