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Pre-2.0 release, MFC firewire disk changes to properly detach SIMs.
[dragonfly.git] / crypto / heimdal-0.6.3 / lib / krb5 / crypto.c
blob3da8d303e3124e846dc44a56f2c0d34235957120
1 /*
2 * Copyright (c) 1997 - 2004 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include "krb5_locl.h"
35 RCSID("$Id: crypto.c,v 1.73.2.4 2004/03/06 16:38:00 lha Exp $");
36
37 #undef CRYPTO_DEBUG
38 #ifdef CRYPTO_DEBUG
39 static void krb5_crypto_debug(krb5_context, int, size_t, krb5_keyblock*);
40 #endif
41
42
43 struct key_data {
44 krb5_keyblock *key;
45 krb5_data *schedule;
46 };
47
48 struct key_usage {
49 unsigned usage;
50 struct key_data key;
51 };
52
53 struct krb5_crypto_data {
54 struct encryption_type *et;
55 struct key_data key;
56 int num_key_usage;
57 struct key_usage *key_usage;
58 };
59
60 #define CRYPTO_ETYPE(C) ((C)->et->type)
61
62 /* bits for `flags' below */
63 #define F_KEYED 1 /* checksum is keyed */
64 #define F_CPROOF 2 /* checksum is collision proof */
65 #define F_DERIVED 4 /* uses derived keys */
66 #define F_VARIANT 8 /* uses `variant' keys (6.4.3) */
67 #define F_PSEUDO 16 /* not a real protocol type */
68 #define F_SPECIAL 32 /* backwards */
69
70 struct salt_type {
71 krb5_salttype type;
72 const char *name;
73 krb5_error_code (*string_to_key)(krb5_context, krb5_enctype, krb5_data,
74 krb5_salt, krb5_data, krb5_keyblock*);
75 };
76
77 struct key_type {
78 krb5_keytype type; /* XXX */
79 const char *name;
80 size_t bits;
81 size_t size;
82 size_t schedule_size;
83 #if 0
84 krb5_enctype best_etype;
85 #endif
86 void (*random_key)(krb5_context, krb5_keyblock*);
87 void (*schedule)(krb5_context, struct key_data *);
88 struct salt_type *string_to_key;
89 };
90
91 struct checksum_type {
92 krb5_cksumtype type;
93 const char *name;
94 size_t blocksize;
95 size_t checksumsize;
96 unsigned flags;
97 void (*checksum)(krb5_context context,
98 struct key_data *key,
99 const void *buf, size_t len,
100 unsigned usage,
101 Checksum *csum);
102 krb5_error_code (*verify)(krb5_context context,
103 struct key_data *key,
104 const void *buf, size_t len,
105 unsigned usage,
106 Checksum *csum);
107 };
108
109 struct encryption_type {
110 krb5_enctype type;
111 const char *name;
112 size_t blocksize;
113 size_t padsize;
114 size_t confoundersize;
115 struct key_type *keytype;
116 struct checksum_type *checksum;
117 struct checksum_type *keyed_checksum;
118 unsigned flags;
119 krb5_error_code (*encrypt)(krb5_context context,
120 struct key_data *key,
121 void *data, size_t len,
122 krb5_boolean encrypt,
123 int usage,
124 void *ivec);
125 };
126
127 #define ENCRYPTION_USAGE(U) (((U) << 8) | 0xAA)
128 #define INTEGRITY_USAGE(U) (((U) << 8) | 0x55)
129 #define CHECKSUM_USAGE(U) (((U) << 8) | 0x99)
130
131 static struct checksum_type *_find_checksum(krb5_cksumtype type);
132 static struct encryption_type *_find_enctype(krb5_enctype type);
133 static struct key_type *_find_keytype(krb5_keytype type);
134 static krb5_error_code _get_derived_key(krb5_context, krb5_crypto,
135 unsigned, struct key_data**);
136 static struct key_data *_new_derived_key(krb5_crypto crypto, unsigned usage);
137 static krb5_error_code derive_key(krb5_context context,
138 struct encryption_type *et,
139 struct key_data *key,
140 const void *constant,
141 size_t len);
142 static krb5_error_code hmac(krb5_context context,
143 struct checksum_type *cm,
144 const void *data,
145 size_t len,
146 unsigned usage,
147 struct key_data *keyblock,
148 Checksum *result);
149 static void free_key_data(krb5_context context, struct key_data *key);
150 static krb5_error_code usage2arcfour (krb5_context, int *);
151
152 /************************************************************
153 * *
154 ************************************************************/
155
156 static void
157 krb5_DES_random_key(krb5_context context,
158 krb5_keyblock *key)
159 {
160 des_cblock *k = key->keyvalue.data;
161 do {
162 krb5_generate_random_block(k, sizeof(des_cblock));
163 des_set_odd_parity(k);
164 } while(des_is_weak_key(k));
165 }
166
167 static void
168 krb5_DES_schedule(krb5_context context,
169 struct key_data *key)
170 {
171 des_set_key(key->key->keyvalue.data, key->schedule->data);
172 }
173
174 static void
175 DES_string_to_key_int(unsigned char *data, size_t length, des_cblock *key)
176 {
177 des_key_schedule schedule;
178 int i;
179 int reverse = 0;
180 unsigned char *p;
181
182 unsigned char swap[] = { 0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
183 0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf };
184 memset(key, 0, 8);
185
186 p = (unsigned char*)key;
187 for (i = 0; i < length; i++) {
188 unsigned char tmp = data[i];
189 if (!reverse)
190 *p++ ^= (tmp << 1);
191 else
192 *--p ^= (swap[tmp & 0xf] << 4) | swap[(tmp & 0xf0) >> 4];
193 if((i % 8) == 7)
194 reverse = !reverse;
195 }
196 des_set_odd_parity(key);
197 if(des_is_weak_key(key))
198 (*key)[7] ^= 0xF0;
199 des_set_key(key, schedule);
200 des_cbc_cksum((void*)data, key, length, schedule, key);
201 memset(schedule, 0, sizeof(schedule));
202 des_set_odd_parity(key);
203 }
204
205 static krb5_error_code
206 krb5_DES_string_to_key(krb5_context context,
207 krb5_enctype enctype,
208 krb5_data password,
209 krb5_salt salt,
210 krb5_data opaque,
211 krb5_keyblock *key)
212 {
213 unsigned char *s;
214 size_t len;
215 des_cblock tmp;
216
217 len = password.length + salt.saltvalue.length;
218 s = malloc(len);
219 if(len > 0 && s == NULL) {
220 krb5_set_error_string(context, "malloc: out of memory");
221 return ENOMEM;
222 }
223 memcpy(s, password.data, password.length);
224 memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
225 DES_string_to_key_int(s, len, &tmp);
226 key->keytype = enctype;
227 krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
228 memset(&tmp, 0, sizeof(tmp));
229 memset(s, 0, len);
230 free(s);
231 return 0;
232 }
233
234 /* This defines the Andrew string_to_key function. It accepts a password
235 * string as input and converts its via a one-way encryption algorithm to a DES
236 * encryption key. It is compatible with the original Andrew authentication
237 * service password database.
238 */
239
240 /*
241 * Short passwords, i.e 8 characters or less.
242 */
243 static void
244 krb5_DES_AFS3_CMU_string_to_key (krb5_data pw,
245 krb5_data cell,
246 des_cblock *key)
247 {
248 char password[8+1]; /* crypt is limited to 8 chars anyway */
249 int i;
250
251 for(i = 0; i < 8; i++) {
252 char c = ((i < pw.length) ? ((char*)pw.data)[i] : 0) ^
253 ((i < cell.length) ?
254 tolower(((unsigned char*)cell.data)[i]) : 0);
255 password[i] = c ? c : 'X';
256 }
257 password[8] = '\0';
258
259 memcpy(key, crypt(password, "p1") + 2, sizeof(des_cblock));
260
261 /* parity is inserted into the LSB so left shift each byte up one
262 bit. This allows ascii characters with a zero MSB to retain as
263 much significance as possible. */
264 for (i = 0; i < sizeof(des_cblock); i++)
265 ((unsigned char*)key)[i] <<= 1;
266 des_set_odd_parity (key);
267 }
268
269 /*
270 * Long passwords, i.e 9 characters or more.
271 */
272 static void
273 krb5_DES_AFS3_Transarc_string_to_key (krb5_data pw,
274 krb5_data cell,
275 des_cblock *key)
276 {
277 des_key_schedule schedule;
278 des_cblock temp_key;
279 des_cblock ivec;
280 char password[512];
281 size_t passlen;
282
283 memcpy(password, pw.data, min(pw.length, sizeof(password)));
284 if(pw.length < sizeof(password)) {
285 int len = min(cell.length, sizeof(password) - pw.length);
286 int i;
287
288 memcpy(password + pw.length, cell.data, len);
289 for (i = pw.length; i < pw.length + len; ++i)
290 password[i] = tolower((unsigned char)password[i]);
291 }
292 passlen = min(sizeof(password), pw.length + cell.length);
293 memcpy(&ivec, "kerberos", 8);
294 memcpy(&temp_key, "kerberos", 8);
295 des_set_odd_parity (&temp_key);
296 des_set_key (&temp_key, schedule);
297 des_cbc_cksum (password, &ivec, passlen, schedule, &ivec);
298
299 memcpy(&temp_key, &ivec, 8);
300 des_set_odd_parity (&temp_key);
301 des_set_key (&temp_key, schedule);
302 des_cbc_cksum (password, key, passlen, schedule, &ivec);
303 memset(&schedule, 0, sizeof(schedule));
304 memset(&temp_key, 0, sizeof(temp_key));
305 memset(&ivec, 0, sizeof(ivec));
306 memset(password, 0, sizeof(password));
307
308 des_set_odd_parity (key);
309 }
310
311 static krb5_error_code
312 DES_AFS3_string_to_key(krb5_context context,
313 krb5_enctype enctype,
314 krb5_data password,
315 krb5_salt salt,
316 krb5_data opaque,
317 krb5_keyblock *key)
318 {
319 des_cblock tmp;
320 if(password.length > 8)
321 krb5_DES_AFS3_Transarc_string_to_key(password, salt.saltvalue, &tmp);
322 else
323 krb5_DES_AFS3_CMU_string_to_key(password, salt.saltvalue, &tmp);
324 key->keytype = enctype;
325 krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
326 memset(&key, 0, sizeof(key));
327 return 0;
328 }
329
330 static void
331 DES3_random_key(krb5_context context,
332 krb5_keyblock *key)
333 {
334 des_cblock *k = key->keyvalue.data;
335 do {
336 krb5_generate_random_block(k, 3 * sizeof(des_cblock));
337 des_set_odd_parity(&k[0]);
338 des_set_odd_parity(&k[1]);
339 des_set_odd_parity(&k[2]);
340 } while(des_is_weak_key(&k[0]) ||
341 des_is_weak_key(&k[1]) ||
342 des_is_weak_key(&k[2]));
343 }
344
345 static void
346 DES3_schedule(krb5_context context,
347 struct key_data *key)
348 {
349 des_cblock *k = key->key->keyvalue.data;
350 des_key_schedule *s = key->schedule->data;
351 des_set_key(&k[0], s[0]);
352 des_set_key(&k[1], s[1]);
353 des_set_key(&k[2], s[2]);
354 }
355
356 /*
357 * A = A xor B. A & B are 8 bytes.
358 */
359
360 static void
361 xor (des_cblock *key, const unsigned char *b)
362 {
363 unsigned char *a = (unsigned char*)key;
364 a[0] ^= b[0];
365 a[1] ^= b[1];
366 a[2] ^= b[2];
367 a[3] ^= b[3];
368 a[4] ^= b[4];
369 a[5] ^= b[5];
370 a[6] ^= b[6];
371 a[7] ^= b[7];
372 }
373
374 static krb5_error_code
375 DES3_string_to_key(krb5_context context,
376 krb5_enctype enctype,
377 krb5_data password,
378 krb5_salt salt,
379 krb5_data opaque,
380 krb5_keyblock *key)
381 {
382 char *str;
383 size_t len;
384 unsigned char tmp[24];
385 des_cblock keys[3];
386
387 len = password.length + salt.saltvalue.length;
388 str = malloc(len);
389 if(len != 0 && str == NULL) {
390 krb5_set_error_string(context, "malloc: out of memory");
391 return ENOMEM;
392 }
393 memcpy(str, password.data, password.length);
394 memcpy(str + password.length, salt.saltvalue.data, salt.saltvalue.length);
395 {
396 des_cblock ivec;
397 des_key_schedule s[3];
398 int i;
399
400 _krb5_n_fold(str, len, tmp, 24);
401
402 for(i = 0; i < 3; i++){
403 memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
404 des_set_odd_parity(keys + i);
405 if(des_is_weak_key(keys + i))
406 xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
407 des_set_key(keys + i, s[i]);
408 }
409 memset(&ivec, 0, sizeof(ivec));
410 des_ede3_cbc_encrypt(tmp,
411 tmp, sizeof(tmp),
412 s[0], s[1], s[2], &ivec, DES_ENCRYPT);
413 memset(s, 0, sizeof(s));
414 memset(&ivec, 0, sizeof(ivec));
415 for(i = 0; i < 3; i++){
416 memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
417 des_set_odd_parity(keys + i);
418 if(des_is_weak_key(keys + i))
419 xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
420 }
421 memset(tmp, 0, sizeof(tmp));
422 }
423 key->keytype = enctype;
424 krb5_data_copy(&key->keyvalue, keys, sizeof(keys));
425 memset(keys, 0, sizeof(keys));
426 memset(str, 0, len);
427 free(str);
428 return 0;
429 }
430
431 static krb5_error_code
432 DES3_string_to_key_derived(krb5_context context,
433 krb5_enctype enctype,
434 krb5_data password,
435 krb5_salt salt,
436 krb5_data opaque,
437 krb5_keyblock *key)
438 {
439 krb5_error_code ret;
440 size_t len = password.length + salt.saltvalue.length;
441 char *s;
442
443 s = malloc(len);
444 if(len != 0 && s == NULL) {
445 krb5_set_error_string(context, "malloc: out of memory");
446 return ENOMEM;
447 }
448 memcpy(s, password.data, password.length);
449 memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
450 ret = krb5_string_to_key_derived(context,
451 s,
452 len,
453 enctype,
454 key);
455 memset(s, 0, len);
456 free(s);
457 return ret;
458 }
459
460 /*
461 * ARCFOUR
462 */
463
464 static void
465 ARCFOUR_random_key(krb5_context context, krb5_keyblock *key)
466 {
467 krb5_generate_random_block (key->keyvalue.data,
468 key->keyvalue.length);
469 }
470
471 static void
472 ARCFOUR_schedule(krb5_context context, struct key_data *kd)
473 {
474 RC4_set_key (kd->schedule->data,
475 kd->key->keyvalue.length, kd->key->keyvalue.data);
476 }
477
478 static krb5_error_code
479 ARCFOUR_string_to_key(krb5_context context,
480 krb5_enctype enctype,
481 krb5_data password,
482 krb5_salt salt,
483 krb5_data opaque,
484 krb5_keyblock *key)
485 {
486 char *s, *p;
487 size_t len;
488 int i;
489 MD4_CTX m;
490
491 len = 2 * password.length;
492 s = malloc (len);
493 if (len != 0 && s == NULL) {
494 krb5_set_error_string(context, "malloc: out of memory");
495 return ENOMEM;
496 }
497 for (p = s, i = 0; i < password.length; ++i) {
498 *p++ = ((char *)password.data)[i];
499 *p++ = 0;
500 }
501 MD4_Init (&m);
502 MD4_Update (&m, s, len);
503 key->keytype = enctype;
504 krb5_data_alloc (&key->keyvalue, 16);
505 MD4_Final (key->keyvalue.data, &m);
506 memset (s, 0, len);
507 free (s);
508 return 0;
509 }
510
511 #ifdef ENABLE_AES
512 /*
513 * AES
514 */
515
516 /* iter is really 1 based, so iter == 0 will be 1 iteration */
517
518 krb5_error_code
519 krb5_PKCS5_PBKDF2(krb5_context context, krb5_cksumtype cktype,
520 krb5_data password, krb5_salt salt, u_int32_t iter,
521 krb5_keytype type, krb5_keyblock *key)
522 {
523 struct checksum_type *c = _find_checksum(cktype);
524 struct key_type *kt;
525 size_t datalen, leftofkey;
526 krb5_error_code ret;
527 u_int32_t keypart;
528 struct key_data ksign;
529 krb5_keyblock kb;
530 Checksum result;
531 char *data, *tmpcksum;
532 int i, j;
533 char *p;
534
535 if (c == NULL) {
536 krb5_set_error_string(context, "checksum %d not supported", cktype);
537 return KRB5_PROG_KEYTYPE_NOSUPP;
538 }
539
540 kt = _find_keytype(type);
541 if (kt == NULL) {
542 krb5_set_error_string(context, "key type %d not supported", type);
543 return KRB5_PROG_KEYTYPE_NOSUPP;
544 }
545
546 key->keytype = type;
547 ret = krb5_data_alloc (&key->keyvalue, kt->bits / 8);
548 if (ret) {
549 krb5_set_error_string(context, "malloc: out of memory");
550 return ret;
551 }
552
553 ret = krb5_data_alloc (&result.checksum, c->checksumsize);
554 if (ret) {
555 krb5_set_error_string(context, "malloc: out of memory");
556 krb5_data_free (&key->keyvalue);
557 return ret;
558 }
559
560 tmpcksum = malloc(c->checksumsize);
561 if (tmpcksum == NULL) {
562 krb5_set_error_string(context, "malloc: out of memory");
563 krb5_data_free (&key->keyvalue);
564 krb5_data_free (&result.checksum);
565 return ENOMEM;
566 }
567
568 datalen = salt.saltvalue.length + 4;
569 data = malloc(datalen);
570 if (data == NULL) {
571 krb5_set_error_string(context, "malloc: out of memory");
572 free(tmpcksum);
573 krb5_data_free (&key->keyvalue);
574 krb5_data_free (&result.checksum);
575 return ENOMEM;
576 }
577
578 kb.keyvalue = password;
579 ksign.key = &kb;
580
581 memcpy(data, salt.saltvalue.data, salt.saltvalue.length);
582
583 keypart = 1;
584 leftofkey = key->keyvalue.length;
585 p = key->keyvalue.data;
586
587 while (leftofkey) {
588 int len;
589
590 if (leftofkey > c->checksumsize)
591 len = c->checksumsize;
592 else
593 len = leftofkey;
594
595 _krb5_put_int(data + datalen - 4, keypart, 4);
596
597 ret = hmac(context, c, data, datalen, 0, &ksign, &result);
598 if (ret)
599 krb5_abortx(context, "hmac failed");
600 memcpy(p, result.checksum.data, len);
601 memcpy(tmpcksum, result.checksum.data, result.checksum.length);
602 for (i = 0; i < iter; i++) {
603 ret = hmac(context, c, tmpcksum, result.checksum.length,
604 0, &ksign, &result);
605 if (ret)
606 krb5_abortx(context, "hmac failed");
607 memcpy(tmpcksum, result.checksum.data, result.checksum.length);
608 for (j = 0; j < len; j++)
609 p[j] ^= tmpcksum[j];
610 }
611
612 p += len;
613 leftofkey -= len;
614 keypart++;
615 }
616
617 free(data);
618 free(tmpcksum);
619 krb5_data_free (&result.checksum);
620
621 return 0;
622 }
623
624 static krb5_error_code
625 AES_string_to_key(krb5_context context,
626 krb5_enctype enctype,
627 krb5_data password,
628 krb5_salt salt,
629 krb5_data opaque,
630 krb5_keyblock *key)
631 {
632 krb5_error_code ret;
633 u_int32_t iter;
634 struct encryption_type *et;
635 struct key_data kd;
636
637 if (opaque.length == 0)
638 iter = 45056 - 1;
639 else if (opaque.length == 4) {
640 unsigned long v;
641 _krb5_get_int(opaque.data, &v, 4);
642 iter = ((u_int32_t)v) - 1;
643 } else
644 return KRB5_PROG_KEYTYPE_NOSUPP; /* XXX */
645
646
647 et = _find_enctype(enctype);
648 if (et == NULL)
649 return KRB5_PROG_KEYTYPE_NOSUPP;
650
651 ret = krb5_PKCS5_PBKDF2(context, CKSUMTYPE_SHA1, password, salt,
652 iter, enctype, key);
653 if (ret)
654 return ret;
655
656 ret = krb5_copy_keyblock(context, key, &kd.key);
657 kd.schedule = NULL;
658
659 ret = derive_key(context, et, &kd, "kerberos", strlen("kerberos"));
660
661 if (ret) {
662 krb5_data_free(&key->keyvalue);
663 } else {
664 ret = krb5_copy_keyblock_contents(context, kd.key, key);
665 free_key_data(context, &kd);
666 }
667
668 return ret;
669 }
670
671 static void
672 AES_schedule(krb5_context context, struct key_data *kd)
673 {
674 AES_KEY *key = kd->schedule->data;
675 int bits = kd->key->keyvalue.length * 8;
676
677 AES_set_encrypt_key(kd->key->keyvalue.data, bits, &key[0]);
678 AES_set_decrypt_key(kd->key->keyvalue.data, bits, &key[1]);
679 }
680
681 /*
682 *
683 */
684
685 extern struct salt_type AES_salt[];
686
687 #endif /* ENABLE_AES */
688
689 extern struct salt_type des_salt[],
690 des3_salt[], des3_salt_derived[], arcfour_salt[];
691
692 struct key_type keytype_null = {
693 KEYTYPE_NULL,
694 "null",
695 0,
696 0,
697 0,
698 NULL,
699 NULL,
700 NULL
701 };
702
703 struct key_type keytype_des = {
704 KEYTYPE_DES,
705 "des",
706 56,
707 sizeof(des_cblock),
708 sizeof(des_key_schedule),
709 krb5_DES_random_key,
710 krb5_DES_schedule,
711 des_salt
712 };
713
714 struct key_type keytype_des3 = {
715 KEYTYPE_DES3,
716 "des3",
717 168,
718 3 * sizeof(des_cblock),
719 3 * sizeof(des_key_schedule),
720 DES3_random_key,
721 DES3_schedule,
722 des3_salt
723 };
724
725 struct key_type keytype_des3_derived = {
726 KEYTYPE_DES3,
727 "des3",
728 168,
729 3 * sizeof(des_cblock),
730 3 * sizeof(des_key_schedule),
731 DES3_random_key,
732 DES3_schedule,
733 des3_salt_derived
734 };
735
736 #ifdef ENABLE_AES
737 struct key_type keytype_aes128 = {
738 KEYTYPE_AES128,
739 "aes-128",
740 128,
741 16,
742 sizeof(AES_KEY) * 2,
743 NULL,
744 AES_schedule,
745 AES_salt
746 };
747
748 struct key_type keytype_aes256 = {
749 KEYTYPE_AES256,
750 "aes-256",
751 256,
752 16,
753 sizeof(AES_KEY) * 2,
754 NULL,
755 AES_schedule,
756 AES_salt
757 };
758 #endif /* ENABLE_AES */
759
760 struct key_type keytype_arcfour = {
761 KEYTYPE_ARCFOUR,
762 "arcfour",
763 128,
764 16,
765 sizeof(RC4_KEY),
766 ARCFOUR_random_key,
767 ARCFOUR_schedule,
768 arcfour_salt
769 };
770
771 struct key_type *keytypes[] = {
772 &keytype_null,
773 &keytype_des,
774 &keytype_des3_derived,
775 &keytype_des3,
776 #ifdef ENABLE_AES
777 &keytype_aes128,
778 &keytype_aes256,
779 #endif /* ENABLE_AES */
780 &keytype_arcfour
781 };
782
783 static int num_keytypes = sizeof(keytypes) / sizeof(keytypes[0]);
784
785 static struct key_type *
786 _find_keytype(krb5_keytype type)
787 {
788 int i;
789 for(i = 0; i < num_keytypes; i++)
790 if(keytypes[i]->type == type)
791 return keytypes[i];
792 return NULL;
793 }
794
795
796 struct salt_type des_salt[] = {
797 {
798 KRB5_PW_SALT,
799 "pw-salt",
800 krb5_DES_string_to_key
801 },
802 {
803 KRB5_AFS3_SALT,
804 "afs3-salt",
805 DES_AFS3_string_to_key
806 },
807 { 0 }
808 };
809
810 struct salt_type des3_salt[] = {
811 {
812 KRB5_PW_SALT,
813 "pw-salt",
814 DES3_string_to_key
815 },
816 { 0 }
817 };
818
819 struct salt_type des3_salt_derived[] = {
820 {
821 KRB5_PW_SALT,
822 "pw-salt",
823 DES3_string_to_key_derived
824 },
825 { 0 }
826 };
827
828 #ifdef ENABLE_AES
829 struct salt_type AES_salt[] = {
830 {
831 KRB5_PW_SALT,
832 "pw-salt",
833 AES_string_to_key
834 },
835 { 0 }
836 };
837 #endif /* ENABLE_AES */
838
839 struct salt_type arcfour_salt[] = {
840 {
841 KRB5_PW_SALT,
842 "pw-salt",
843 ARCFOUR_string_to_key
844 },
845 { 0 }
846 };
847
848 krb5_error_code
849 krb5_salttype_to_string (krb5_context context,
850 krb5_enctype etype,
851 krb5_salttype stype,
852 char **string)
853 {
854 struct encryption_type *e;
855 struct salt_type *st;
856
857 e = _find_enctype (etype);
858 if (e == NULL) {
859 krb5_set_error_string(context, "encryption type %d not supported",
860 etype);
861 return KRB5_PROG_ETYPE_NOSUPP;
862 }
863 for (st = e->keytype->string_to_key; st && st->type; st++) {
864 if (st->type == stype) {
865 *string = strdup (st->name);
866 if (*string == NULL) {
867 krb5_set_error_string(context, "malloc: out of memory");
868 return ENOMEM;
869 }
870 return 0;
871 }
872 }
873 krb5_set_error_string(context, "salttype %d not supported", stype);
874 return HEIM_ERR_SALTTYPE_NOSUPP;
875 }
876
877 krb5_error_code
878 krb5_string_to_salttype (krb5_context context,
879 krb5_enctype etype,
880 const char *string,
881 krb5_salttype *salttype)
882 {
883 struct encryption_type *e;
884 struct salt_type *st;
885
886 e = _find_enctype (etype);
887 if (e == NULL) {
888 krb5_set_error_string(context, "encryption type %d not supported",
889 etype);
890 return KRB5_PROG_ETYPE_NOSUPP;
891 }
892 for (st = e->keytype->string_to_key; st && st->type; st++) {
893 if (strcasecmp (st->name, string) == 0) {
894 *salttype = st->type;
895 return 0;
896 }
897 }
898 krb5_set_error_string(context, "salttype %s not supported", string);
899 return HEIM_ERR_SALTTYPE_NOSUPP;
900 }
901
902 krb5_error_code
903 krb5_get_pw_salt(krb5_context context,
904 krb5_const_principal principal,
905 krb5_salt *salt)
906 {
907 size_t len;
908 int i;
909 krb5_error_code ret;
910 char *p;
911
912 salt->salttype = KRB5_PW_SALT;
913 len = strlen(principal->realm);
914 for (i = 0; i < principal->name.name_string.len; ++i)
915 len += strlen(principal->name.name_string.val[i]);
916 ret = krb5_data_alloc (&salt->saltvalue, len);
917 if (ret)
918 return ret;
919 p = salt->saltvalue.data;
920 memcpy (p, principal->realm, strlen(principal->realm));
921 p += strlen(principal->realm);
922 for (i = 0; i < principal->name.name_string.len; ++i) {
923 memcpy (p,
924 principal->name.name_string.val[i],
925 strlen(principal->name.name_string.val[i]));
926 p += strlen(principal->name.name_string.val[i]);
927 }
928 return 0;
929 }
930
931 krb5_error_code
932 krb5_free_salt(krb5_context context,
933 krb5_salt salt)
934 {
935 krb5_data_free(&salt.saltvalue);
936 return 0;
937 }
938
939 krb5_error_code
940 krb5_string_to_key_data (krb5_context context,
941 krb5_enctype enctype,
942 krb5_data password,
943 krb5_principal principal,
944 krb5_keyblock *key)
945 {
946 krb5_error_code ret;
947 krb5_salt salt;
948
949 ret = krb5_get_pw_salt(context, principal, &salt);
950 if(ret)
951 return ret;
952 ret = krb5_string_to_key_data_salt(context, enctype, password, salt, key);
953 krb5_free_salt(context, salt);
954 return ret;
955 }
956
957 krb5_error_code
958 krb5_string_to_key (krb5_context context,
959 krb5_enctype enctype,
960 const char *password,
961 krb5_principal principal,
962 krb5_keyblock *key)
963 {
964 krb5_data pw;
965 pw.data = (void*)password;
966 pw.length = strlen(password);
967 return krb5_string_to_key_data(context, enctype, pw, principal, key);
968 }
969
970 krb5_error_code
971 krb5_string_to_key_data_salt (krb5_context context,
972 krb5_enctype enctype,
973 krb5_data password,
974 krb5_salt salt,
975 krb5_keyblock *key)
976 {
977 krb5_data opaque;
978 krb5_data_zero(&opaque);
979 return krb5_string_to_key_data_salt_opaque(context, enctype, password,
980 salt, opaque, key);
981 }
982
983 /*
984 * Do a string -> key for encryption type `enctype' operation on
985 * `password' (with salt `salt' and the enctype specific data string
986 * `opaque'), returning the resulting key in `key'
987 */
988
989 krb5_error_code
990 krb5_string_to_key_data_salt_opaque (krb5_context context,
991 krb5_enctype enctype,
992 krb5_data password,
993 krb5_salt salt,
994 krb5_data opaque,
995 krb5_keyblock *key)
996 {
997 struct encryption_type *et =_find_enctype(enctype);
998 struct salt_type *st;
999 if(et == NULL) {
1000 krb5_set_error_string(context, "encryption type %d not supported",
1001 enctype);
1002 return KRB5_PROG_ETYPE_NOSUPP;
1003 }
1004 for(st = et->keytype->string_to_key; st && st->type; st++)
1005 if(st->type == salt.salttype)
1006 return (*st->string_to_key)(context, enctype, password,
1007 salt, opaque, key);
1008 krb5_set_error_string(context, "salt type %d not supported",
1009 salt.salttype);
1010 return HEIM_ERR_SALTTYPE_NOSUPP;
1011 }
1012
1013 /*
1014 * Do a string -> key for encryption type `enctype' operation on the
1015 * string `password' (with salt `salt'), returning the resulting key
1016 * in `key'
1017 */
1018
1019 krb5_error_code
1020 krb5_string_to_key_salt (krb5_context context,
1021 krb5_enctype enctype,
1022 const char *password,
1023 krb5_salt salt,
1024 krb5_keyblock *key)
1025 {
1026 krb5_data pw;
1027 pw.data = (void*)password;
1028 pw.length = strlen(password);
1029 return krb5_string_to_key_data_salt(context, enctype, pw, salt, key);
1030 }
1031
1032 krb5_error_code
1033 krb5_keytype_to_string(krb5_context context,
1034 krb5_keytype keytype,
1035 char **string)
1036 {
1037 struct key_type *kt = _find_keytype(keytype);
1038 if(kt == NULL) {
1039 krb5_set_error_string(context, "key type %d not supported", keytype);
1040 return KRB5_PROG_KEYTYPE_NOSUPP;
1041 }
1042 *string = strdup(kt->name);
1043 if(*string == NULL) {
1044 krb5_set_error_string(context, "malloc: out of memory");
1045 return ENOMEM;
1046 }
1047 return 0;
1048 }
1049
1050 krb5_error_code
1051 krb5_string_to_keytype(krb5_context context,
1052 const char *string,
1053 krb5_keytype *keytype)
1054 {
1055 int i;
1056 for(i = 0; i < num_keytypes; i++)
1057 if(strcasecmp(keytypes[i]->name, string) == 0){
1058 *keytype = keytypes[i]->type;
1059 return 0;
1060 }
1061 krb5_set_error_string(context, "key type %s not supported", string);
1062 return KRB5_PROG_KEYTYPE_NOSUPP;
1063 }
1064
1065 krb5_error_code
1066 krb5_enctype_keysize(krb5_context context,
1067 krb5_enctype type,
1068 size_t *keysize)
1069 {
1070 struct encryption_type *et = _find_enctype(type);
1071 if(et == NULL) {
1072 krb5_set_error_string(context, "encryption type %d not supported",
1073 type);
1074 return KRB5_PROG_ETYPE_NOSUPP;
1075 }
1076 *keysize = et->keytype->size;
1077 return 0;
1078 }
1079
1080 krb5_error_code
1081 krb5_generate_random_keyblock(krb5_context context,
1082 krb5_enctype type,
1083 krb5_keyblock *key)
1084 {
1085 krb5_error_code ret;
1086 struct encryption_type *et = _find_enctype(type);
1087 if(et == NULL) {
1088 krb5_set_error_string(context, "encryption type %d not supported",
1089 type);
1090 return KRB5_PROG_ETYPE_NOSUPP;
1091 }
1092 ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
1093 if(ret)
1094 return ret;
1095 key->keytype = type;
1096 if(et->keytype->random_key)
1097 (*et->keytype->random_key)(context, key);
1098 else
1099 krb5_generate_random_block(key->keyvalue.data,
1100 key->keyvalue.length);
1101 return 0;
1102 }
1103
1104 static krb5_error_code
1105 _key_schedule(krb5_context context,
1106 struct key_data *key)
1107 {
1108 krb5_error_code ret;
1109 struct encryption_type *et = _find_enctype(key->key->keytype);
1110 struct key_type *kt = et->keytype;
1111
1112 if(kt->schedule == NULL)
1113 return 0;
1114 if (key->schedule != NULL)
1115 return 0;
1116 ALLOC(key->schedule, 1);
1117 if(key->schedule == NULL) {
1118 krb5_set_error_string(context, "malloc: out of memory");
1119 return ENOMEM;
1120 }
1121 ret = krb5_data_alloc(key->schedule, kt->schedule_size);
1122 if(ret) {
1123 free(key->schedule);
1124 key->schedule = NULL;
1125 return ret;
1126 }
1127 (*kt->schedule)(context, key);
1128 return 0;
1129 }
1130
1131 /************************************************************
1132 * *
1133 ************************************************************/
1134
1135 static void
1136 NONE_checksum(krb5_context context,
1137 struct key_data *key,
1138 const void *data,
1139 size_t len,
1140 unsigned usage,
1141 Checksum *C)
1142 {
1143 }
1144
1145 static void
1146 CRC32_checksum(krb5_context context,
1147 struct key_data *key,
1148 const void *data,
1149 size_t len,
1150 unsigned usage,
1151 Checksum *C)
1152 {
1153 u_int32_t crc;
1154 unsigned char *r = C->checksum.data;
1155 _krb5_crc_init_table ();
1156 crc = _krb5_crc_update (data, len, 0);
1157 r[0] = crc & 0xff;
1158 r[1] = (crc >> 8) & 0xff;
1159 r[2] = (crc >> 16) & 0xff;
1160 r[3] = (crc >> 24) & 0xff;
1161 }
1162
1163 static void
1164 RSA_MD4_checksum(krb5_context context,
1165 struct key_data *key,
1166 const void *data,
1167 size_t len,
1168 unsigned usage,
1169 Checksum *C)
1170 {
1171 MD4_CTX m;
1172
1173 MD4_Init (&m);
1174 MD4_Update (&m, data, len);
1175 MD4_Final (C->checksum.data, &m);
1176 }
1177
1178 static void
1179 RSA_MD4_DES_checksum(krb5_context context,
1180 struct key_data *key,
1181 const void *data,
1182 size_t len,
1183 unsigned usage,
1184 Checksum *cksum)
1185 {
1186 MD4_CTX md4;
1187 des_cblock ivec;
1188 unsigned char *p = cksum->checksum.data;
1189
1190 krb5_generate_random_block(p, 8);
1191 MD4_Init (&md4);
1192 MD4_Update (&md4, p, 8);
1193 MD4_Update (&md4, data, len);
1194 MD4_Final (p + 8, &md4);
1195 memset (&ivec, 0, sizeof(ivec));
1196 des_cbc_encrypt(p,
1197 p,
1198 24,
1199 key->schedule->data,
1200 &ivec,
1201 DES_ENCRYPT);
1202 }
1203
1204 static krb5_error_code
1205 RSA_MD4_DES_verify(krb5_context context,
1206 struct key_data *key,
1207 const void *data,
1208 size_t len,
1209 unsigned usage,
1210 Checksum *C)
1211 {
1212 MD4_CTX md4;
1213 unsigned char tmp[24];
1214 unsigned char res[16];
1215 des_cblock ivec;
1216 krb5_error_code ret = 0;
1217
1218 memset(&ivec, 0, sizeof(ivec));
1219 des_cbc_encrypt(C->checksum.data,
1220 (void*)tmp,
1221 C->checksum.length,
1222 key->schedule->data,
1223 &ivec,
1224 DES_DECRYPT);
1225 MD4_Init (&md4);
1226 MD4_Update (&md4, tmp, 8); /* confounder */
1227 MD4_Update (&md4, data, len);
1228 MD4_Final (res, &md4);
1229 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1230 krb5_clear_error_string (context);
1231 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1232 }
1233 memset(tmp, 0, sizeof(tmp));
1234 memset(res, 0, sizeof(res));
1235 return ret;
1236 }
1237
1238 static void
1239 RSA_MD5_checksum(krb5_context context,
1240 struct key_data *key,
1241 const void *data,
1242 size_t len,
1243 unsigned usage,
1244 Checksum *C)
1245 {
1246 MD5_CTX m;
1247
1248 MD5_Init (&m);
1249 MD5_Update(&m, data, len);
1250 MD5_Final (C->checksum.data, &m);
1251 }
1252
1253 static void
1254 RSA_MD5_DES_checksum(krb5_context context,
1255 struct key_data *key,
1256 const void *data,
1257 size_t len,
1258 unsigned usage,
1259 Checksum *C)
1260 {
1261 MD5_CTX md5;
1262 des_cblock ivec;
1263 unsigned char *p = C->checksum.data;
1264
1265 krb5_generate_random_block(p, 8);
1266 MD5_Init (&md5);
1267 MD5_Update (&md5, p, 8);
1268 MD5_Update (&md5, data, len);
1269 MD5_Final (p + 8, &md5);
1270 memset (&ivec, 0, sizeof(ivec));
1271 des_cbc_encrypt(p,
1272 p,
1273 24,
1274 key->schedule->data,
1275 &ivec,
1276 DES_ENCRYPT);
1277 }
1278
1279 static krb5_error_code
1280 RSA_MD5_DES_verify(krb5_context context,
1281 struct key_data *key,
1282 const void *data,
1283 size_t len,
1284 unsigned usage,
1285 Checksum *C)
1286 {
1287 MD5_CTX md5;
1288 unsigned char tmp[24];
1289 unsigned char res[16];
1290 des_cblock ivec;
1291 des_key_schedule *sched = key->schedule->data;
1292 krb5_error_code ret = 0;
1293
1294 memset(&ivec, 0, sizeof(ivec));
1295 des_cbc_encrypt(C->checksum.data,
1296 (void*)tmp,
1297 C->checksum.length,
1298 sched[0],
1299 &ivec,
1300 DES_DECRYPT);
1301 MD5_Init (&md5);
1302 MD5_Update (&md5, tmp, 8); /* confounder */
1303 MD5_Update (&md5, data, len);
1304 MD5_Final (res, &md5);
1305 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1306 krb5_clear_error_string (context);
1307 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1308 }
1309 memset(tmp, 0, sizeof(tmp));
1310 memset(res, 0, sizeof(res));
1311 return ret;
1312 }
1313
1314 static void
1315 RSA_MD5_DES3_checksum(krb5_context context,
1316 struct key_data *key,
1317 const void *data,
1318 size_t len,
1319 unsigned usage,
1320 Checksum *C)
1321 {
1322 MD5_CTX md5;
1323 des_cblock ivec;
1324 unsigned char *p = C->checksum.data;
1325 des_key_schedule *sched = key->schedule->data;
1326
1327 krb5_generate_random_block(p, 8);
1328 MD5_Init (&md5);
1329 MD5_Update (&md5, p, 8);
1330 MD5_Update (&md5, data, len);
1331 MD5_Final (p + 8, &md5);
1332 memset (&ivec, 0, sizeof(ivec));
1333 des_ede3_cbc_encrypt(p,
1334 p,
1335 24,
1336 sched[0], sched[1], sched[2],
1337 &ivec,
1338 DES_ENCRYPT);
1339 }
1340
1341 static krb5_error_code
1342 RSA_MD5_DES3_verify(krb5_context context,
1343 struct key_data *key,
1344 const void *data,
1345 size_t len,
1346 unsigned usage,
1347 Checksum *C)
1348 {
1349 MD5_CTX md5;
1350 unsigned char tmp[24];
1351 unsigned char res[16];
1352 des_cblock ivec;
1353 des_key_schedule *sched = key->schedule->data;
1354 krb5_error_code ret = 0;
1355
1356 memset(&ivec, 0, sizeof(ivec));
1357 des_ede3_cbc_encrypt(C->checksum.data,
1358 (void*)tmp,
1359 C->checksum.length,
1360 sched[0], sched[1], sched[2],
1361 &ivec,
1362 DES_DECRYPT);
1363 MD5_Init (&md5);
1364 MD5_Update (&md5, tmp, 8); /* confounder */
1365 MD5_Update (&md5, data, len);
1366 MD5_Final (res, &md5);
1367 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1368 krb5_clear_error_string (context);
1369 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1370 }
1371 memset(tmp, 0, sizeof(tmp));
1372 memset(res, 0, sizeof(res));
1373 return ret;
1374 }
1375
1376 static void
1377 SHA1_checksum(krb5_context context,
1378 struct key_data *key,
1379 const void *data,
1380 size_t len,
1381 unsigned usage,
1382 Checksum *C)
1383 {
1384 SHA_CTX m;
1385
1386 SHA1_Init(&m);
1387 SHA1_Update(&m, data, len);
1388 SHA1_Final(C->checksum.data, &m);
1389 }
1390
1391 /* HMAC according to RFC2104 */
1392 static krb5_error_code
1393 hmac(krb5_context context,
1394 struct checksum_type *cm,
1395 const void *data,
1396 size_t len,
1397 unsigned usage,
1398 struct key_data *keyblock,
1399 Checksum *result)
1400 {
1401 unsigned char *ipad, *opad;
1402 unsigned char *key;
1403 size_t key_len;
1404 int i;
1405
1406 ipad = malloc(cm->blocksize + len);
1407 if (ipad == NULL)
1408 return ENOMEM;
1409 opad = malloc(cm->blocksize + cm->checksumsize);
1410 if (opad == NULL) {
1411 free(ipad);
1412 return ENOMEM;
1413 }
1414 memset(ipad, 0x36, cm->blocksize);
1415 memset(opad, 0x5c, cm->blocksize);
1416
1417 if(keyblock->key->keyvalue.length > cm->blocksize){
1418 (*cm->checksum)(context,
1419 keyblock,
1420 keyblock->key->keyvalue.data,
1421 keyblock->key->keyvalue.length,
1422 usage,
1423 result);
1424 key = result->checksum.data;
1425 key_len = result->checksum.length;
1426 } else {
1427 key = keyblock->key->keyvalue.data;
1428 key_len = keyblock->key->keyvalue.length;
1429 }
1430 for(i = 0; i < key_len; i++){
1431 ipad[i] ^= key[i];
1432 opad[i] ^= key[i];
1433 }
1434 memcpy(ipad + cm->blocksize, data, len);
1435 (*cm->checksum)(context, keyblock, ipad, cm->blocksize + len,
1436 usage, result);
1437 memcpy(opad + cm->blocksize, result->checksum.data,
1438 result->checksum.length);
1439 (*cm->checksum)(context, keyblock, opad,
1440 cm->blocksize + cm->checksumsize, usage, result);
1441 memset(ipad, 0, cm->blocksize + len);
1442 free(ipad);
1443 memset(opad, 0, cm->blocksize + cm->checksumsize);
1444 free(opad);
1445
1446 return 0;
1447 }
1448
1449 krb5_error_code
1450 krb5_hmac(krb5_context context,
1451 krb5_cksumtype cktype,
1452 const void *data,
1453 size_t len,
1454 unsigned usage,
1455 krb5_keyblock *key,
1456 Checksum *result)
1457 {
1458 struct checksum_type *c = _find_checksum(cktype);
1459 struct key_data kd;
1460 krb5_error_code ret;
1461
1462 if (c == NULL) {
1463 krb5_set_error_string (context, "checksum type %d not supported",
1464 cktype);
1465 return KRB5_PROG_SUMTYPE_NOSUPP;
1466 }
1467
1468 kd.key = key;
1469 kd.schedule = NULL;
1470
1471 ret = hmac(context, c, data, len, usage, &kd, result);
1472
1473 if (kd.schedule)
1474 krb5_free_data(context, kd.schedule);
1475
1476 return ret;
1477 }
1478
1479 static void
1480 SP_HMAC_SHA1_checksum(krb5_context context,
1481 struct key_data *key,
1482 const void *data,
1483 size_t len,
1484 unsigned usage,
1485 Checksum *result)
1486 {
1487 struct checksum_type *c = _find_checksum(CKSUMTYPE_SHA1);
1488 Checksum res;
1489 char sha1_data[20];
1490 krb5_error_code ret;
1491
1492 res.checksum.data = sha1_data;
1493 res.checksum.length = sizeof(sha1_data);
1494
1495 ret = hmac(context, c, data, len, usage, key, &res);
1496 if (ret)
1497 krb5_abortx(context, "hmac failed");
1498 memcpy(result->checksum.data, res.checksum.data, result->checksum.length);
1499 }
1500
1501 /*
1502 * checksum according to section 5. of draft-brezak-win2k-krb-rc4-hmac-03.txt
1503 */
1504
1505 static void
1506 HMAC_MD5_checksum(krb5_context context,
1507 struct key_data *key,
1508 const void *data,
1509 size_t len,
1510 unsigned usage,
1511 Checksum *result)
1512 {
1513 MD5_CTX md5;
1514 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
1515 const char signature[] = "signaturekey";
1516 Checksum ksign_c;
1517 struct key_data ksign;
1518 krb5_keyblock kb;
1519 unsigned char t[4];
1520 unsigned char tmp[16];
1521 unsigned char ksign_c_data[16];
1522 krb5_error_code ret;
1523
1524 ksign_c.checksum.length = sizeof(ksign_c_data);
1525 ksign_c.checksum.data = ksign_c_data;
1526 ret = hmac(context, c, signature, sizeof(signature), 0, key, &ksign_c);
1527 if (ret)
1528 krb5_abortx(context, "hmac failed");
1529 ksign.key = &kb;
1530 kb.keyvalue = ksign_c.checksum;
1531 MD5_Init (&md5);
1532 t[0] = (usage >> 0) & 0xFF;
1533 t[1] = (usage >> 8) & 0xFF;
1534 t[2] = (usage >> 16) & 0xFF;
1535 t[3] = (usage >> 24) & 0xFF;
1536 MD5_Update (&md5, t, 4);
1537 MD5_Update (&md5, data, len);
1538 MD5_Final (tmp, &md5);
1539 ret = hmac(context, c, tmp, sizeof(tmp), 0, &ksign, result);
1540 if (ret)
1541 krb5_abortx(context, "hmac failed");
1542 }
1543
1544 /*
1545 * same as previous but being used while encrypting.
1546 */
1547
1548 static void
1549 HMAC_MD5_checksum_enc(krb5_context context,
1550 struct key_data *key,
1551 const void *data,
1552 size_t len,
1553 unsigned usage,
1554 Checksum *result)
1555 {
1556 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
1557 Checksum ksign_c;
1558 struct key_data ksign;
1559 krb5_keyblock kb;
1560 unsigned char t[4];
1561 unsigned char ksign_c_data[16];
1562 krb5_error_code ret;
1563
1564 t[0] = (usage >> 0) & 0xFF;
1565 t[1] = (usage >> 8) & 0xFF;
1566 t[2] = (usage >> 16) & 0xFF;
1567 t[3] = (usage >> 24) & 0xFF;
1568
1569 ksign_c.checksum.length = sizeof(ksign_c_data);
1570 ksign_c.checksum.data = ksign_c_data;
1571 ret = hmac(context, c, t, sizeof(t), 0, key, &ksign_c);
1572 if (ret)
1573 krb5_abortx(context, "hmac failed");
1574 ksign.key = &kb;
1575 kb.keyvalue = ksign_c.checksum;
1576 ret = hmac(context, c, data, len, 0, &ksign, result);
1577 if (ret)
1578 krb5_abortx(context, "hmac failed");
1579 }
1580
1581 struct checksum_type checksum_none = {
1582 CKSUMTYPE_NONE,
1583 "none",
1584 1,
1585 0,
1586 0,
1587 NONE_checksum,
1588 NULL
1589 };
1590 struct checksum_type checksum_crc32 = {
1591 CKSUMTYPE_CRC32,
1592 "crc32",
1593 1,
1594 4,
1595 0,
1596 CRC32_checksum,
1597 NULL
1598 };
1599 struct checksum_type checksum_rsa_md4 = {
1600 CKSUMTYPE_RSA_MD4,
1601 "rsa-md4",
1602 64,
1603 16,
1604 F_CPROOF,
1605 RSA_MD4_checksum,
1606 NULL
1607 };
1608 struct checksum_type checksum_rsa_md4_des = {
1609 CKSUMTYPE_RSA_MD4_DES,
1610 "rsa-md4-des",
1611 64,
1612 24,
1613 F_KEYED | F_CPROOF | F_VARIANT,
1614 RSA_MD4_DES_checksum,
1615 RSA_MD4_DES_verify
1616 };
1617 #if 0
1618 struct checksum_type checksum_des_mac = {
1619 CKSUMTYPE_DES_MAC,
1620 "des-mac",
1621 0,
1622 0,
1623 0,
1624 DES_MAC_checksum
1625 };
1626 struct checksum_type checksum_des_mac_k = {
1627 CKSUMTYPE_DES_MAC_K,
1628 "des-mac-k",
1629 0,
1630 0,
1631 0,
1632 DES_MAC_K_checksum
1633 };
1634 struct checksum_type checksum_rsa_md4_des_k = {
1635 CKSUMTYPE_RSA_MD4_DES_K,
1636 "rsa-md4-des-k",
1637 0,
1638 0,
1639 0,
1640 RSA_MD4_DES_K_checksum,
1641 RSA_MD4_DES_K_verify
1642 };
1643 #endif
1644 struct checksum_type checksum_rsa_md5 = {
1645 CKSUMTYPE_RSA_MD5,
1646 "rsa-md5",
1647 64,
1648 16,
1649 F_CPROOF,
1650 RSA_MD5_checksum,
1651 NULL
1652 };
1653 struct checksum_type checksum_rsa_md5_des = {
1654 CKSUMTYPE_RSA_MD5_DES,
1655 "rsa-md5-des",
1656 64,
1657 24,
1658 F_KEYED | F_CPROOF | F_VARIANT,
1659 RSA_MD5_DES_checksum,
1660 RSA_MD5_DES_verify
1661 };
1662 struct checksum_type checksum_rsa_md5_des3 = {
1663 CKSUMTYPE_RSA_MD5_DES3,
1664 "rsa-md5-des3",
1665 64,
1666 24,
1667 F_KEYED | F_CPROOF | F_VARIANT,
1668 RSA_MD5_DES3_checksum,
1669 RSA_MD5_DES3_verify
1670 };
1671 struct checksum_type checksum_sha1 = {
1672 CKSUMTYPE_SHA1,
1673 "sha1",
1674 64,
1675 20,
1676 F_CPROOF,
1677 SHA1_checksum,
1678 NULL
1679 };
1680 struct checksum_type checksum_hmac_sha1_des3 = {
1681 CKSUMTYPE_HMAC_SHA1_DES3,
1682 "hmac-sha1-des3",
1683 64,
1684 20,
1685 F_KEYED | F_CPROOF | F_DERIVED,
1686 SP_HMAC_SHA1_checksum,
1687 NULL
1688 };
1689
1690 #ifdef ENABLE_AES
1691 struct checksum_type checksum_hmac_sha1_aes128 = {
1692 CKSUMTYPE_HMAC_SHA1_96_AES_128,
1693 "hmac-sha1-96-aes128",
1694 64,
1695 12,
1696 F_KEYED | F_CPROOF | F_DERIVED,
1697 SP_HMAC_SHA1_checksum,
1698 NULL
1699 };
1700
1701 struct checksum_type checksum_hmac_sha1_aes256 = {
1702 CKSUMTYPE_HMAC_SHA1_96_AES_256,
1703 "hmac-sha1-96-aes256",
1704 64,
1705 12,
1706 F_KEYED | F_CPROOF | F_DERIVED,
1707 SP_HMAC_SHA1_checksum,
1708 NULL
1709 };
1710 #endif /* ENABLE_AES */
1711
1712 struct checksum_type checksum_hmac_md5 = {
1713 CKSUMTYPE_HMAC_MD5,
1714 "hmac-md5",
1715 64,
1716 16,
1717 F_KEYED | F_CPROOF,
1718 HMAC_MD5_checksum,
1719 NULL
1720 };
1721
1722 struct checksum_type checksum_hmac_md5_enc = {
1723 CKSUMTYPE_HMAC_MD5_ENC,
1724 "hmac-md5-enc",
1725 64,
1726 16,
1727 F_KEYED | F_CPROOF | F_PSEUDO,
1728 HMAC_MD5_checksum_enc,
1729 NULL
1730 };
1731
1732 struct checksum_type *checksum_types[] = {
1733 &checksum_none,
1734 &checksum_crc32,
1735 &checksum_rsa_md4,
1736 &checksum_rsa_md4_des,
1737 #if 0
1738 &checksum_des_mac,
1739 &checksum_des_mac_k,
1740 &checksum_rsa_md4_des_k,
1741 #endif
1742 &checksum_rsa_md5,
1743 &checksum_rsa_md5_des,
1744 &checksum_rsa_md5_des3,
1745 &checksum_sha1,
1746 &checksum_hmac_sha1_des3,
1747 #ifdef ENABLE_AES
1748 &checksum_hmac_sha1_aes128,
1749 &checksum_hmac_sha1_aes256,
1750 #endif
1751 &checksum_hmac_md5,
1752 &checksum_hmac_md5_enc
1753 };
1754
1755 static int num_checksums = sizeof(checksum_types) / sizeof(checksum_types[0]);
1756
1757 static struct checksum_type *
1758 _find_checksum(krb5_cksumtype type)
1759 {
1760 int i;
1761 for(i = 0; i < num_checksums; i++)
1762 if(checksum_types[i]->type == type)
1763 return checksum_types[i];
1764 return NULL;
1765 }
1766
1767 static krb5_error_code
1768 get_checksum_key(krb5_context context,
1769 krb5_crypto crypto,
1770 unsigned usage, /* not krb5_key_usage */
1771 struct checksum_type *ct,
1772 struct key_data **key)
1773 {
1774 krb5_error_code ret = 0;
1775
1776 if(ct->flags & F_DERIVED)
1777 ret = _get_derived_key(context, crypto, usage, key);
1778 else if(ct->flags & F_VARIANT) {
1779 int i;
1780
1781 *key = _new_derived_key(crypto, 0xff/* KRB5_KU_RFC1510_VARIANT */);
1782 if(*key == NULL) {
1783 krb5_set_error_string(context, "malloc: out of memory");
1784 return ENOMEM;
1785 }
1786 ret = krb5_copy_keyblock(context, crypto->key.key, &(*key)->key);
1787 if(ret)
1788 return ret;
1789 for(i = 0; i < (*key)->key->keyvalue.length; i++)
1790 ((unsigned char*)(*key)->key->keyvalue.data)[i] ^= 0xF0;
1791 } else {
1792 *key = &crypto->key;
1793 }
1794 if(ret == 0)
1795 ret = _key_schedule(context, *key);
1796 return ret;
1797 }
1798
1799 static krb5_error_code
1800 create_checksum (krb5_context context,
1801 struct checksum_type *ct,
1802 krb5_crypto crypto,
1803 unsigned usage,
1804 void *data,
1805 size_t len,
1806 Checksum *result)
1807 {
1808 krb5_error_code ret;
1809 struct key_data *dkey;
1810 int keyed_checksum;
1811
1812 keyed_checksum = (ct->flags & F_KEYED) != 0;
1813 if(keyed_checksum && crypto == NULL) {
1814 krb5_clear_error_string (context);
1815 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
1816 }
1817 if(keyed_checksum) {
1818 ret = get_checksum_key(context, crypto, usage, ct, &dkey);
1819 if (ret)
1820 return ret;
1821 } else
1822 dkey = NULL;
1823 result->cksumtype = ct->type;
1824 krb5_data_alloc(&result->checksum, ct->checksumsize);
1825 (*ct->checksum)(context, dkey, data, len, usage, result);
1826 return 0;
1827 }
1828
1829 static int
1830 arcfour_checksum_p(struct checksum_type *ct, krb5_crypto crypto)
1831 {
1832 return (ct->type == CKSUMTYPE_HMAC_MD5) &&
1833 (crypto->key.key->keytype == KEYTYPE_ARCFOUR);
1834 }
1835
1836 krb5_error_code
1837 krb5_create_checksum(krb5_context context,
1838 krb5_crypto crypto,
1839 krb5_key_usage usage,
1840 int type,
1841 void *data,
1842 size_t len,
1843 Checksum *result)
1844 {
1845 struct checksum_type *ct = NULL;
1846 unsigned keyusage;
1847
1848 /* type 0 -> pick from crypto */
1849 if (type) {
1850 ct = _find_checksum(type);
1851 } else if (crypto) {
1852 ct = crypto->et->keyed_checksum;
1853 if (ct == NULL)
1854 ct = crypto->et->checksum;
1855 }
1856
1857 if(ct == NULL) {
1858 krb5_set_error_string (context, "checksum type %d not supported",
1859 type);
1860 return KRB5_PROG_SUMTYPE_NOSUPP;
1861 }
1862
1863 if (arcfour_checksum_p(ct, crypto)) {
1864 keyusage = usage;
1865 usage2arcfour(context, &keyusage);
1866 } else
1867 keyusage = CHECKSUM_USAGE(usage);
1868
1869 return create_checksum(context, ct, crypto, keyusage,
1870 data, len, result);
1871 }
1872
1873 static krb5_error_code
1874 verify_checksum(krb5_context context,
1875 krb5_crypto crypto,
1876 unsigned usage, /* not krb5_key_usage */
1877 void *data,
1878 size_t len,
1879 Checksum *cksum)
1880 {
1881 krb5_error_code ret;
1882 struct key_data *dkey;
1883 int keyed_checksum;
1884 Checksum c;
1885 struct checksum_type *ct;
1886
1887 ct = _find_checksum(cksum->cksumtype);
1888 if (ct == NULL) {
1889 krb5_set_error_string (context, "checksum type %d not supported",
1890 cksum->cksumtype);
1891 return KRB5_PROG_SUMTYPE_NOSUPP;
1892 }
1893 if(ct->checksumsize != cksum->checksum.length) {
1894 krb5_clear_error_string (context);
1895 return KRB5KRB_AP_ERR_BAD_INTEGRITY; /* XXX */
1896 }
1897 keyed_checksum = (ct->flags & F_KEYED) != 0;
1898 if(keyed_checksum && crypto == NULL) {
1899 krb5_clear_error_string (context);
1900 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
1901 }
1902 if(keyed_checksum)
1903 ret = get_checksum_key(context, crypto, usage, ct, &dkey);
1904 else
1905 dkey = NULL;
1906 if(ct->verify)
1907 return (*ct->verify)(context, dkey, data, len, usage, cksum);
1908
1909 ret = krb5_data_alloc (&c.checksum, ct->checksumsize);
1910 if (ret)
1911 return ret;
1912
1913 (*ct->checksum)(context, dkey, data, len, usage, &c);
1914
1915 if(c.checksum.length != cksum->checksum.length ||
1916 memcmp(c.checksum.data, cksum->checksum.data, c.checksum.length)) {
1917 krb5_clear_error_string (context);
1918 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1919 } else {
1920 ret = 0;
1921 }
1922 krb5_data_free (&c.checksum);
1923 return ret;
1924 }
1925
1926 krb5_error_code
1927 krb5_verify_checksum(krb5_context context,
1928 krb5_crypto crypto,
1929 krb5_key_usage usage,
1930 void *data,
1931 size_t len,
1932 Checksum *cksum)
1933 {
1934 struct checksum_type *ct;
1935 unsigned keyusage;
1936
1937 ct = _find_checksum(cksum->cksumtype);
1938 if(ct == NULL) {
1939 krb5_set_error_string (context, "checksum type %d not supported",
1940 cksum->cksumtype);
1941 return KRB5_PROG_SUMTYPE_NOSUPP;
1942 }
1943
1944 if (arcfour_checksum_p(ct, crypto)) {
1945 keyusage = usage;
1946 usage2arcfour(context, &keyusage);
1947 } else
1948 keyusage = CHECKSUM_USAGE(usage);
1949
1950 return verify_checksum(context, crypto, keyusage,
1951 data, len, cksum);
1952 }
1953
1954 krb5_error_code
1955 krb5_checksumsize(krb5_context context,
1956 krb5_cksumtype type,
1957 size_t *size)
1958 {
1959 struct checksum_type *ct = _find_checksum(type);
1960 if(ct == NULL) {
1961 krb5_set_error_string (context, "checksum type %d not supported",
1962 type);
1963 return KRB5_PROG_SUMTYPE_NOSUPP;
1964 }
1965 *size = ct->checksumsize;
1966 return 0;
1967 }
1968
1969 krb5_boolean
1970 krb5_checksum_is_keyed(krb5_context context,
1971 krb5_cksumtype type)
1972 {
1973 struct checksum_type *ct = _find_checksum(type);
1974 if(ct == NULL) {
1975 krb5_set_error_string (context, "checksum type %d not supported",
1976 type);
1977 return KRB5_PROG_SUMTYPE_NOSUPP;
1978 }
1979 return ct->flags & F_KEYED;
1980 }
1981
1982 krb5_boolean
1983 krb5_checksum_is_collision_proof(krb5_context context,
1984 krb5_cksumtype type)
1985 {
1986 struct checksum_type *ct = _find_checksum(type);
1987 if(ct == NULL) {
1988 krb5_set_error_string (context, "checksum type %d not supported",
1989 type);
1990 return KRB5_PROG_SUMTYPE_NOSUPP;
1991 }
1992 return ct->flags & F_CPROOF;
1993 }
1994
1995 /************************************************************
1996 * *
1997 ************************************************************/
1998
1999 static krb5_error_code
2000 NULL_encrypt(krb5_context context,
2001 struct key_data *key,
2002 void *data,
2003 size_t len,
2004 krb5_boolean encrypt,
2005 int usage,
2006 void *ivec)
2007 {
2008 return 0;
2009 }
2010
2011 static krb5_error_code
2012 DES_CBC_encrypt_null_ivec(krb5_context context,
2013 struct key_data *key,
2014 void *data,
2015 size_t len,
2016 krb5_boolean encrypt,
2017 int usage,
2018 void *ignore_ivec)
2019 {
2020 des_cblock ivec;
2021 des_key_schedule *s = key->schedule->data;
2022 memset(&ivec, 0, sizeof(ivec));
2023 des_cbc_encrypt(data, data, len, *s, &ivec, encrypt);
2024 return 0;
2025 }
2026
2027 static krb5_error_code
2028 DES_CBC_encrypt_key_ivec(krb5_context context,
2029 struct key_data *key,
2030 void *data,
2031 size_t len,
2032 krb5_boolean encrypt,
2033 int usage,
2034 void *ignore_ivec)
2035 {
2036 des_cblock ivec;
2037 des_key_schedule *s = key->schedule->data;
2038 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
2039 des_cbc_encrypt(data, data, len, *s, &ivec, encrypt);
2040 return 0;
2041 }
2042
2043 static krb5_error_code
2044 DES3_CBC_encrypt(krb5_context context,
2045 struct key_data *key,
2046 void *data,
2047 size_t len,
2048 krb5_boolean encrypt,
2049 int usage,
2050 void *ivec)
2051 {
2052 des_cblock local_ivec;
2053 des_key_schedule *s = key->schedule->data;
2054 if(ivec == NULL) {
2055 ivec = &local_ivec;
2056 memset(local_ivec, 0, sizeof(local_ivec));
2057 }
2058 des_ede3_cbc_encrypt(data, data, len, s[0], s[1], s[2], ivec, encrypt);
2059 return 0;
2060 }
2061
2062 static krb5_error_code
2063 DES_CFB64_encrypt_null_ivec(krb5_context context,
2064 struct key_data *key,
2065 void *data,
2066 size_t len,
2067 krb5_boolean encrypt,
2068 int usage,
2069 void *ignore_ivec)
2070 {
2071 des_cblock ivec;
2072 int num = 0;
2073 des_key_schedule *s = key->schedule->data;
2074 memset(&ivec, 0, sizeof(ivec));
2075
2076 des_cfb64_encrypt(data, data, len, *s, &ivec, &num, encrypt);
2077 return 0;
2078 }
2079
2080 static krb5_error_code
2081 DES_PCBC_encrypt_key_ivec(krb5_context context,
2082 struct key_data *key,
2083 void *data,
2084 size_t len,
2085 krb5_boolean encrypt,
2086 int usage,
2087 void *ignore_ivec)
2088 {
2089 des_cblock ivec;
2090 des_key_schedule *s = key->schedule->data;
2091 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
2092
2093 des_pcbc_encrypt(data, data, len, *s, &ivec, encrypt);
2094 return 0;
2095 }
2096
2097 #ifdef ENABLE_AES
2098
2099 /*
2100 * AES draft-raeburn-krb-rijndael-krb-02
2101 */
2102
2103 void
2104 _krb5_aes_cts_encrypt(const unsigned char *in, unsigned char *out,
2105 size_t len, const void *aes_key,
2106 unsigned char *ivec, const int enc)
2107 {
2108 unsigned char tmp[AES_BLOCK_SIZE];
2109 const AES_KEY *key = aes_key; /* XXX remove this when we always have AES */
2110 int i;
2111
2112 /*
2113 * In the framework of kerberos, the length can never be shorter
2114 * then at least one blocksize.
2115 */
2116
2117 if (enc == AES_ENCRYPT) {
2118
2119 while(len > AES_BLOCK_SIZE) {
2120 for (i = 0; i < AES_BLOCK_SIZE; i++)
2121 tmp[i] = in[i] ^ ivec[i];
2122 AES_encrypt(tmp, out, key);
2123 memcpy(ivec, out, AES_BLOCK_SIZE);
2124 len -= AES_BLOCK_SIZE;
2125 in += AES_BLOCK_SIZE;
2126 out += AES_BLOCK_SIZE;
2127 }
2128
2129 for (i = 0; i < len; i++)
2130 tmp[i] = in[i] ^ ivec[i];
2131 for (; i < AES_BLOCK_SIZE; i++)
2132 tmp[i] = 0 ^ ivec[i];
2133
2134 AES_encrypt(tmp, out - AES_BLOCK_SIZE, key);
2135
2136 memcpy(out, ivec, len);
2137
2138 } else {
2139 char tmp2[AES_BLOCK_SIZE];
2140 char tmp3[AES_BLOCK_SIZE];
2141
2142 while(len > AES_BLOCK_SIZE * 2) {
2143 memcpy(tmp, in, AES_BLOCK_SIZE);
2144 AES_decrypt(in, out, key);
2145 for (i = 0; i < AES_BLOCK_SIZE; i++)
2146 out[i] ^= ivec[i];
2147 memcpy(ivec, tmp, AES_BLOCK_SIZE);
2148 len -= AES_BLOCK_SIZE;
2149 in += AES_BLOCK_SIZE;
2150 out += AES_BLOCK_SIZE;
2151 }
2152
2153 len -= AES_BLOCK_SIZE;
2154
2155 AES_decrypt(in, tmp2, key);
2156
2157 memcpy(tmp3, in + AES_BLOCK_SIZE, len);
2158 memcpy(tmp3 + len, tmp2 + len, AES_BLOCK_SIZE - len); /* xor 0 */
2159
2160 for (i = 0; i < len; i++)
2161 out[i + AES_BLOCK_SIZE] = tmp2[i] ^ tmp3[i];
2162
2163 AES_decrypt(tmp3, out, key);
2164 for (i = 0; i < AES_BLOCK_SIZE; i++)
2165 out[i] ^= ivec[i];
2166 }
2167 }
2168
2169 static krb5_error_code
2170 AES_CTS_encrypt(krb5_context context,
2171 struct key_data *key,
2172 void *data,
2173 size_t len,
2174 krb5_boolean encrypt,
2175 int usage,
2176 void *ivec)
2177 {
2178 AES_KEY *k = key->schedule->data;
2179 char local_ivec[AES_BLOCK_SIZE];
2180
2181 if (encrypt)
2182 k = &k[0];
2183 else
2184 k = &k[1];
2185
2186 if (len < AES_BLOCK_SIZE)
2187 krb5_abortx(context, "invalid use of AES_CTS_encrypt");
2188 if (len == AES_BLOCK_SIZE) {
2189 if (encrypt)
2190 AES_encrypt(data, data, k);
2191 else
2192 AES_decrypt(data, data, k);
2193 } else {
2194 if(ivec == NULL) {
2195 memset(local_ivec, 0, sizeof(local_ivec));
2196 ivec = local_ivec;
2197 }
2198 _krb5_aes_cts_encrypt(data, data, len, k, ivec, encrypt);
2199 }
2200
2201 return 0;
2202 }
2203 #endif /* ENABLE_AES */
2204
2205 /*
2206 * section 6 of draft-brezak-win2k-krb-rc4-hmac-03
2207 *
2208 * warning: not for small children
2209 */
2210
2211 static krb5_error_code
2212 ARCFOUR_subencrypt(krb5_context context,
2213 struct key_data *key,
2214 void *data,
2215 size_t len,
2216 int usage,
2217 void *ivec)
2218 {
2219 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
2220 Checksum k1_c, k2_c, k3_c, cksum;
2221 struct key_data ke;
2222 krb5_keyblock kb;
2223 unsigned char t[4];
2224 RC4_KEY rc4_key;
2225 unsigned char *cdata = data;
2226 unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
2227 krb5_error_code ret;
2228
2229 t[0] = (usage >> 0) & 0xFF;
2230 t[1] = (usage >> 8) & 0xFF;
2231 t[2] = (usage >> 16) & 0xFF;
2232 t[3] = (usage >> 24) & 0xFF;
2233
2234 k1_c.checksum.length = sizeof(k1_c_data);
2235 k1_c.checksum.data = k1_c_data;
2236
2237 ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
2238 if (ret)
2239 krb5_abortx(context, "hmac failed");
2240
2241 memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
2242
2243 k2_c.checksum.length = sizeof(k2_c_data);
2244 k2_c.checksum.data = k2_c_data;
2245
2246 ke.key = &kb;
2247 kb.keyvalue = k2_c.checksum;
2248
2249 cksum.checksum.length = 16;
2250 cksum.checksum.data = data;
2251
2252 ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
2253 if (ret)
2254 krb5_abortx(context, "hmac failed");
2255
2256 ke.key = &kb;
2257 kb.keyvalue = k1_c.checksum;
2258
2259 k3_c.checksum.length = sizeof(k3_c_data);
2260 k3_c.checksum.data = k3_c_data;
2261
2262 ret = hmac(NULL, c, data, 16, 0, &ke, &k3_c);
2263 if (ret)
2264 krb5_abortx(context, "hmac failed");
2265
2266 RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data);
2267 RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16);
2268 memset (k1_c_data, 0, sizeof(k1_c_data));
2269 memset (k2_c_data, 0, sizeof(k2_c_data));
2270 memset (k3_c_data, 0, sizeof(k3_c_data));
2271 return 0;
2272 }
2273
2274 static krb5_error_code
2275 ARCFOUR_subdecrypt(krb5_context context,
2276 struct key_data *key,
2277 void *data,
2278 size_t len,
2279 int usage,
2280 void *ivec)
2281 {
2282 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
2283 Checksum k1_c, k2_c, k3_c, cksum;
2284 struct key_data ke;
2285 krb5_keyblock kb;
2286 unsigned char t[4];
2287 RC4_KEY rc4_key;
2288 unsigned char *cdata = data;
2289 unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
2290 unsigned char cksum_data[16];
2291 krb5_error_code ret;
2292
2293 t[0] = (usage >> 0) & 0xFF;
2294 t[1] = (usage >> 8) & 0xFF;
2295 t[2] = (usage >> 16) & 0xFF;
2296 t[3] = (usage >> 24) & 0xFF;
2297
2298 k1_c.checksum.length = sizeof(k1_c_data);
2299 k1_c.checksum.data = k1_c_data;
2300
2301 ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
2302 if (ret)
2303 krb5_abortx(context, "hmac failed");
2304
2305 memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
2306
2307 k2_c.checksum.length = sizeof(k2_c_data);
2308 k2_c.checksum.data = k2_c_data;
2309
2310 ke.key = &kb;
2311 kb.keyvalue = k1_c.checksum;
2312
2313 k3_c.checksum.length = sizeof(k3_c_data);
2314 k3_c.checksum.data = k3_c_data;
2315
2316 ret = hmac(NULL, c, cdata, 16, 0, &ke, &k3_c);
2317 if (ret)
2318 krb5_abortx(context, "hmac failed");
2319
2320 RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data);
2321 RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16);
2322
2323 ke.key = &kb;
2324 kb.keyvalue = k2_c.checksum;
2325
2326 cksum.checksum.length = 16;
2327 cksum.checksum.data = cksum_data;
2328
2329 ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
2330 if (ret)
2331 krb5_abortx(context, "hmac failed");
2332
2333 memset (k1_c_data, 0, sizeof(k1_c_data));
2334 memset (k2_c_data, 0, sizeof(k2_c_data));
2335 memset (k3_c_data, 0, sizeof(k3_c_data));
2336
2337 if (memcmp (cksum.checksum.data, data, 16) != 0) {
2338 krb5_clear_error_string (context);
2339 return KRB5KRB_AP_ERR_BAD_INTEGRITY;
2340 } else {
2341 return 0;
2342 }
2343 }
2344
2345 /*
2346 * convert the usage numbers used in
2347 * draft-ietf-cat-kerb-key-derivation-00.txt to the ones in
2348 * draft-brezak-win2k-krb-rc4-hmac-04.txt
2349 */
2350
2351 static krb5_error_code
2352 usage2arcfour (krb5_context context, int *usage)
2353 {
2354 switch (*usage) {
2355 case KRB5_KU_AS_REP_ENC_PART : /* 3 */
2356 case KRB5_KU_TGS_REP_ENC_PART_SUB_KEY : /* 9 */
2357 *usage = 8;
2358 return 0;
2359 case KRB5_KU_USAGE_SEAL : /* 22 */
2360 *usage = 13;
2361 return 0;
2362 case KRB5_KU_USAGE_SIGN : /* 23 */
2363 *usage = 15;
2364 return 0;
2365 case KRB5_KU_USAGE_SEQ: /* 24 */
2366 *usage = 0;
2367 return 0;
2368 default :
2369 return 0;
2370 }
2371 }
2372
2373 static krb5_error_code
2374 ARCFOUR_encrypt(krb5_context context,
2375 struct key_data *key,
2376 void *data,
2377 size_t len,
2378 krb5_boolean encrypt,
2379 int usage,
2380 void *ivec)
2381 {
2382 krb5_error_code ret;
2383 if((ret = usage2arcfour (context, &usage)) != 0)
2384 return ret;
2385
2386 if (encrypt)
2387 return ARCFOUR_subencrypt (context, key, data, len, usage, ivec);
2388 else
2389 return ARCFOUR_subdecrypt (context, key, data, len, usage, ivec);
2390 }
2391
2392
2393 /*
2394 * these should currently be in reverse preference order.
2395 * (only relevant for !F_PSEUDO) */
2396
2397 static struct encryption_type enctype_null = {
2398 ETYPE_NULL,
2399 "null",
2400 1,
2401 1,
2402 0,
2403 &keytype_null,
2404 &checksum_none,
2405 NULL,
2406 0,
2407 NULL_encrypt,
2408 };
2409 static struct encryption_type enctype_des_cbc_crc = {
2410 ETYPE_DES_CBC_CRC,
2411 "des-cbc-crc",
2412 8,
2413 8,
2414 8,
2415 &keytype_des,
2416 &checksum_crc32,
2417 NULL,
2418 0,
2419 DES_CBC_encrypt_key_ivec,
2420 };
2421 static struct encryption_type enctype_des_cbc_md4 = {
2422 ETYPE_DES_CBC_MD4,
2423 "des-cbc-md4",
2424 8,
2425 8,
2426 8,
2427 &keytype_des,
2428 &checksum_rsa_md4,
2429 &checksum_rsa_md4_des,
2430 0,
2431 DES_CBC_encrypt_null_ivec,
2432 };
2433 static struct encryption_type enctype_des_cbc_md5 = {
2434 ETYPE_DES_CBC_MD5,
2435 "des-cbc-md5",
2436 8,
2437 8,
2438 8,
2439 &keytype_des,
2440 &checksum_rsa_md5,
2441 &checksum_rsa_md5_des,
2442 0,
2443 DES_CBC_encrypt_null_ivec,
2444 };
2445 static struct encryption_type enctype_arcfour_hmac_md5 = {
2446 ETYPE_ARCFOUR_HMAC_MD5,
2447 "arcfour-hmac-md5",
2448 1,
2449 1,
2450 8,
2451 &keytype_arcfour,
2452 &checksum_hmac_md5,
2453 /* &checksum_hmac_md5_enc */ NULL,
2454 F_SPECIAL,
2455 ARCFOUR_encrypt
2456 };
2457 static struct encryption_type enctype_des3_cbc_md5 = {
2458 ETYPE_DES3_CBC_MD5,
2459 "des3-cbc-md5",
2460 8,
2461 8,
2462 8,
2463 &keytype_des3,
2464 &checksum_rsa_md5,
2465 &checksum_rsa_md5_des3,
2466 0,
2467 DES3_CBC_encrypt,
2468 };
2469 static struct encryption_type enctype_des3_cbc_sha1 = {
2470 ETYPE_DES3_CBC_SHA1,
2471 "des3-cbc-sha1",
2472 8,
2473 8,
2474 8,
2475 &keytype_des3_derived,
2476 &checksum_sha1,
2477 &checksum_hmac_sha1_des3,
2478 F_DERIVED,
2479 DES3_CBC_encrypt,
2480 };
2481 static struct encryption_type enctype_old_des3_cbc_sha1 = {
2482 ETYPE_OLD_DES3_CBC_SHA1,
2483 "old-des3-cbc-sha1",
2484 8,
2485 8,
2486 8,
2487 &keytype_des3,
2488 &checksum_sha1,
2489 &checksum_hmac_sha1_des3,
2490 0,
2491 DES3_CBC_encrypt,
2492 };
2493 #ifdef ENABLE_AES
2494 static struct encryption_type enctype_aes128_cts_hmac_sha1 = {
2495 ETYPE_AES128_CTS_HMAC_SHA1_96,
2496 "aes128-cts-hmac-sha1-96",
2497 16,
2498 1,
2499 16,
2500 &keytype_aes128,
2501 &checksum_sha1,
2502 &checksum_hmac_sha1_aes128,
2503 0,
2504 AES_CTS_encrypt,
2505 };
2506 static struct encryption_type enctype_aes256_cts_hmac_sha1 = {
2507 ETYPE_AES256_CTS_HMAC_SHA1_96,
2508 "aes256-cts-hmac-sha1-96",
2509 16,
2510 1,
2511 16,
2512 &keytype_aes256,
2513 &checksum_sha1,
2514 &checksum_hmac_sha1_aes256,
2515 0,
2516 AES_CTS_encrypt,
2517 };
2518 #endif /* ENABLE_AES */
2519 static struct encryption_type enctype_des_cbc_none = {
2520 ETYPE_DES_CBC_NONE,
2521 "des-cbc-none",
2522 8,
2523 8,
2524 0,
2525 &keytype_des,
2526 &checksum_none,
2527 NULL,
2528 F_PSEUDO,
2529 DES_CBC_encrypt_null_ivec,
2530 };
2531 static struct encryption_type enctype_des_cfb64_none = {
2532 ETYPE_DES_CFB64_NONE,
2533 "des-cfb64-none",
2534 1,
2535 1,
2536 0,
2537 &keytype_des,
2538 &checksum_none,
2539 NULL,
2540 F_PSEUDO,
2541 DES_CFB64_encrypt_null_ivec,
2542 };
2543 static struct encryption_type enctype_des_pcbc_none = {
2544 ETYPE_DES_PCBC_NONE,
2545 "des-pcbc-none",
2546 8,
2547 8,
2548 0,
2549 &keytype_des,
2550 &checksum_none,
2551 NULL,
2552 F_PSEUDO,
2553 DES_PCBC_encrypt_key_ivec,
2554 };
2555 static struct encryption_type enctype_des3_cbc_none = {
2556 ETYPE_DES3_CBC_NONE,
2557 "des3-cbc-none",
2558 8,
2559 8,
2560 0,
2561 &keytype_des3_derived,
2562 &checksum_none,
2563 NULL,
2564 F_PSEUDO,
2565 DES3_CBC_encrypt,
2566 };
2567
2568 static struct encryption_type *etypes[] = {
2569 &enctype_null,
2570 &enctype_des_cbc_crc,
2571 &enctype_des_cbc_md4,
2572 &enctype_des_cbc_md5,
2573 &enctype_arcfour_hmac_md5,
2574 &enctype_des3_cbc_md5,
2575 &enctype_des3_cbc_sha1,
2576 &enctype_old_des3_cbc_sha1,
2577 #ifdef ENABLE_AES
2578 &enctype_aes128_cts_hmac_sha1,
2579 &enctype_aes256_cts_hmac_sha1,
2580 #endif
2581 &enctype_des_cbc_none,
2582 &enctype_des_cfb64_none,
2583 &enctype_des_pcbc_none,
2584 &enctype_des3_cbc_none
2585 };
2586
2587 static unsigned num_etypes = sizeof(etypes) / sizeof(etypes[0]);
2588
2589
2590 static struct encryption_type *
2591 _find_enctype(krb5_enctype type)
2592 {
2593 int i;
2594 for(i = 0; i < num_etypes; i++)
2595 if(etypes[i]->type == type)
2596 return etypes[i];
2597 return NULL;
2598 }
2599
2600
2601 krb5_error_code
2602 krb5_enctype_to_string(krb5_context context,
2603 krb5_enctype etype,
2604 char **string)
2605 {
2606 struct encryption_type *e;
2607 e = _find_enctype(etype);
2608 if(e == NULL) {
2609 krb5_set_error_string (context, "encryption type %d not supported",
2610 etype);
2611 return KRB5_PROG_ETYPE_NOSUPP;
2612 }
2613 *string = strdup(e->name);
2614 if(*string == NULL) {
2615 krb5_set_error_string(context, "malloc: out of memory");
2616 return ENOMEM;
2617 }
2618 return 0;
2619 }
2620
2621 krb5_error_code
2622 krb5_string_to_enctype(krb5_context context,
2623 const char *string,
2624 krb5_enctype *etype)
2625 {
2626 int i;
2627 for(i = 0; i < num_etypes; i++)
2628 if(strcasecmp(etypes[i]->name, string) == 0){
2629 *etype = etypes[i]->type;
2630 return 0;
2631 }
2632 krb5_set_error_string (context, "encryption type %s not supported",
2633 string);
2634 return KRB5_PROG_ETYPE_NOSUPP;
2635 }
2636
2637 krb5_error_code
2638 krb5_enctype_to_keytype(krb5_context context,
2639 krb5_enctype etype,
2640 krb5_keytype *keytype)
2641 {
2642 struct encryption_type *e = _find_enctype(etype);
2643 if(e == NULL) {
2644 krb5_set_error_string (context, "encryption type %d not supported",
2645 etype);
2646 return KRB5_PROG_ETYPE_NOSUPP;
2647 }
2648 *keytype = e->keytype->type; /* XXX */
2649 return 0;
2650 }
2651
2652 #if 0
2653 krb5_error_code
2654 krb5_keytype_to_enctype(krb5_context context,
2655 krb5_keytype keytype,
2656 krb5_enctype *etype)
2657 {
2658 struct key_type *kt = _find_keytype(keytype);
2659 krb5_warnx(context, "krb5_keytype_to_enctype(%u)", keytype);
2660 if(kt == NULL)
2661 return KRB5_PROG_KEYTYPE_NOSUPP;
2662 *etype = kt->best_etype;
2663 return 0;
2664 }
2665 #endif
2666
2667 krb5_error_code
2668 krb5_keytype_to_enctypes (krb5_context context,
2669 krb5_keytype keytype,
2670 unsigned *len,
2671 krb5_enctype **val)
2672 {
2673 int i;
2674 unsigned n = 0;
2675 krb5_enctype *ret;
2676
2677 for (i = num_etypes - 1; i >= 0; --i) {
2678 if (etypes[i]->keytype->type == keytype
2679 && !(etypes[i]->flags & F_PSEUDO))
2680 ++n;
2681 }
2682 ret = malloc(n * sizeof(*ret));
2683 if (ret == NULL && n != 0) {
2684 krb5_set_error_string(context, "malloc: out of memory");
2685 return ENOMEM;
2686 }
2687 n = 0;
2688 for (i = num_etypes - 1; i >= 0; --i) {
2689 if (etypes[i]->keytype->type == keytype
2690 && !(etypes[i]->flags & F_PSEUDO))
2691 ret[n++] = etypes[i]->type;
2692 }
2693 *len = n;
2694 *val = ret;
2695 return 0;
2696 }
2697
2698 /*
2699 * First take the configured list of etypes for `keytype' if available,
2700 * else, do `krb5_keytype_to_enctypes'.
2701 */
2702
2703 krb5_error_code
2704 krb5_keytype_to_enctypes_default (krb5_context context,
2705 krb5_keytype keytype,
2706 unsigned *len,
2707 krb5_enctype **val)
2708 {
2709 int i, n;
2710 krb5_enctype *ret;
2711
2712 if (keytype != KEYTYPE_DES || context->etypes_des == NULL)
2713 return krb5_keytype_to_enctypes (context, keytype, len, val);
2714
2715 for (n = 0; context->etypes_des[n]; ++n)
2716 ;
2717 ret = malloc (n * sizeof(*ret));
2718 if (ret == NULL && n != 0) {
2719 krb5_set_error_string(context, "malloc: out of memory");
2720 return ENOMEM;
2721 }
2722 for (i = 0; i < n; ++i)
2723 ret[i] = context->etypes_des[i];
2724 *len = n;
2725 *val = ret;
2726 return 0;
2727 }
2728
2729 krb5_error_code
2730 krb5_enctype_valid(krb5_context context,
2731 krb5_enctype etype)
2732 {
2733 return _find_enctype(etype) != NULL;
2734 }
2735
2736 /* if two enctypes have compatible keys */
2737 krb5_boolean
2738 krb5_enctypes_compatible_keys(krb5_context context,
2739 krb5_enctype etype1,
2740 krb5_enctype etype2)
2741 {
2742 struct encryption_type *e1 = _find_enctype(etype1);
2743 struct encryption_type *e2 = _find_enctype(etype2);
2744 return e1 != NULL && e2 != NULL && e1->keytype == e2->keytype;
2745 }
2746
2747 static krb5_boolean
2748 derived_crypto(krb5_context context,
2749 krb5_crypto crypto)
2750 {
2751 return (crypto->et->flags & F_DERIVED) != 0;
2752 }
2753
2754 static krb5_boolean
2755 special_crypto(krb5_context context,
2756 krb5_crypto crypto)
2757 {
2758 return (crypto->et->flags & F_SPECIAL) != 0;
2759 }
2760
2761 #define CHECKSUMSIZE(C) ((C)->checksumsize)
2762 #define CHECKSUMTYPE(C) ((C)->type)
2763
2764 static krb5_error_code
2765 encrypt_internal_derived(krb5_context context,
2766 krb5_crypto crypto,
2767 unsigned usage,
2768 void *data,
2769 size_t len,
2770 krb5_data *result,
2771 void *ivec)
2772 {
2773 size_t sz, block_sz, checksum_sz, total_sz;
2774 Checksum cksum;
2775 unsigned char *p, *q;
2776 krb5_error_code ret;
2777 struct key_data *dkey;
2778 const struct encryption_type *et = crypto->et;
2779
2780 checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
2781
2782 sz = et->confoundersize + len;
2783 block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
2784 total_sz = block_sz + checksum_sz;
2785 p = calloc(1, total_sz);
2786 if(p == NULL) {
2787 krb5_set_error_string(context, "malloc: out of memory");
2788 return ENOMEM;
2789 }
2790
2791 q = p;
2792 krb5_generate_random_block(q, et->confoundersize); /* XXX */
2793 q += et->confoundersize;
2794 memcpy(q, data, len);
2795
2796 ret = create_checksum(context,
2797 et->keyed_checksum,
2798 crypto,
2799 INTEGRITY_USAGE(usage),
2800 p,
2801 block_sz,
2802 &cksum);
2803 if(ret == 0 && cksum.checksum.length != checksum_sz) {
2804 free_Checksum (&cksum);
2805 krb5_clear_error_string (context);
2806 ret = KRB5_CRYPTO_INTERNAL;
2807 }
2808 if(ret)
2809 goto fail;
2810 memcpy(p + block_sz, cksum.checksum.data, cksum.checksum.length);
2811 free_Checksum (&cksum);
2812 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
2813 if(ret)
2814 goto fail;
2815 ret = _key_schedule(context, dkey);
2816 if(ret)
2817 goto fail;
2818 #ifdef CRYPTO_DEBUG
2819 krb5_crypto_debug(context, 1, block_sz, dkey->key);
2820 #endif
2821 ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec);
2822 if (ret)
2823 goto fail;
2824 result->data = p;
2825 result->length = total_sz;
2826 return 0;
2827 fail:
2828 memset(p, 0, total_sz);
2829 free(p);
2830 return ret;
2831 }
2832
2833
2834 static krb5_error_code
2835 encrypt_internal(krb5_context context,
2836 krb5_crypto crypto,
2837 void *data,
2838 size_t len,
2839 krb5_data *result,
2840 void *ivec)
2841 {
2842 size_t sz, block_sz, checksum_sz;
2843 Checksum cksum;
2844 unsigned char *p, *q;
2845 krb5_error_code ret;
2846 const struct encryption_type *et = crypto->et;
2847
2848 checksum_sz = CHECKSUMSIZE(et->checksum);
2849
2850 sz = et->confoundersize + checksum_sz + len;
2851 block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
2852 p = calloc(1, block_sz);
2853 if(p == NULL) {
2854 krb5_set_error_string(context, "malloc: out of memory");
2855 return ENOMEM;
2856 }
2857
2858 q = p;
2859 krb5_generate_random_block(q, et->confoundersize); /* XXX */
2860 q += et->confoundersize;
2861 memset(q, 0, checksum_sz);
2862 q += checksum_sz;
2863 memcpy(q, data, len);
2864
2865 ret = create_checksum(context,
2866 et->checksum,
2867 crypto,
2868 0,
2869 p,
2870 block_sz,
2871 &cksum);
2872 if(ret == 0 && cksum.checksum.length != checksum_sz) {
2873 krb5_clear_error_string (context);
2874 free_Checksum(&cksum);
2875 ret = KRB5_CRYPTO_INTERNAL;
2876 }
2877 if(ret)
2878 goto fail;
2879 memcpy(p + et->confoundersize, cksum.checksum.data, cksum.checksum.length);
2880 free_Checksum(&cksum);
2881 ret = _key_schedule(context, &crypto->key);
2882 if(ret)
2883 goto fail;
2884 #ifdef CRYPTO_DEBUG
2885 krb5_crypto_debug(context, 1, block_sz, crypto->key.key);
2886 #endif
2887 ret = (*et->encrypt)(context, &crypto->key, p, block_sz, 1, 0, ivec);
2888 if (ret) {
2889 memset(p, 0, block_sz);
2890 free(p);
2891 return ret;
2892 }
2893 result->data = p;
2894 result->length = block_sz;
2895 return 0;
2896 fail:
2897 memset(p, 0, block_sz);
2898 free(p);
2899 return ret;
2900 }
2901
2902 static krb5_error_code
2903 encrypt_internal_special(krb5_context context,
2904 krb5_crypto crypto,
2905 int usage,
2906 void *data,
2907 size_t len,
2908 krb5_data *result,
2909 void *ivec)
2910 {
2911 struct encryption_type *et = crypto->et;
2912 size_t cksum_sz = CHECKSUMSIZE(et->checksum);
2913 size_t sz = len + cksum_sz + et->confoundersize;
2914 char *tmp, *p;
2915 krb5_error_code ret;
2916
2917 tmp = malloc (sz);
2918 if (tmp == NULL) {
2919 krb5_set_error_string(context, "malloc: out of memory");
2920 return ENOMEM;
2921 }
2922 p = tmp;
2923 memset (p, 0, cksum_sz);
2924 p += cksum_sz;
2925 krb5_generate_random_block(p, et->confoundersize);
2926 p += et->confoundersize;
2927 memcpy (p, data, len);
2928 ret = (*et->encrypt)(context, &crypto->key, tmp, sz, TRUE, usage, ivec);
2929 if (ret) {
2930 memset(tmp, 0, sz);
2931 free(tmp);
2932 return ret;
2933 }
2934 result->data = tmp;
2935 result->length = sz;
2936 return 0;
2937 }
2938
2939 static krb5_error_code
2940 decrypt_internal_derived(krb5_context context,
2941 krb5_crypto crypto,
2942 unsigned usage,
2943 void *data,
2944 size_t len,
2945 krb5_data *result,
2946 void *ivec)
2947 {
2948 size_t checksum_sz;
2949 Checksum cksum;
2950 unsigned char *p;
2951 krb5_error_code ret;
2952 struct key_data *dkey;
2953 struct encryption_type *et = crypto->et;
2954 unsigned long l;
2955
2956 checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
2957 if (len < checksum_sz) {
2958 krb5_clear_error_string (context);
2959 return EINVAL; /* XXX - better error code? */
2960 }
2961
2962 if (((len - checksum_sz) % et->padsize) != 0) {
2963 krb5_clear_error_string(context);
2964 return KRB5_BAD_MSIZE;
2965 }
2966
2967 p = malloc(len);
2968 if(len != 0 && p == NULL) {
2969 krb5_set_error_string(context, "malloc: out of memory");
2970 return ENOMEM;
2971 }
2972 memcpy(p, data, len);
2973
2974 len -= checksum_sz;
2975
2976 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
2977 if(ret) {
2978 free(p);
2979 return ret;
2980 }
2981 ret = _key_schedule(context, dkey);
2982 if(ret) {
2983 free(p);
2984 return ret;
2985 }
2986 #ifdef CRYPTO_DEBUG
2987 krb5_crypto_debug(context, 0, len, dkey->key);
2988 #endif
2989 ret = (*et->encrypt)(context, dkey, p, len, 0, usage, ivec);
2990 if (ret) {
2991 free(p);
2992 return ret;
2993 }
2994
2995 cksum.checksum.data = p + len;
2996 cksum.checksum.length = checksum_sz;
2997 cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
2998
2999 ret = verify_checksum(context,
3000 crypto,
3001 INTEGRITY_USAGE(usage),
3002 p,
3003 len,
3004 &cksum);
3005 if(ret) {
3006 free(p);
3007 return ret;
3008 }
3009 l = len - et->confoundersize;
3010 memmove(p, p + et->confoundersize, l);
3011 result->data = realloc(p, l);
3012 if(result->data == NULL) {
3013 free(p);
3014 krb5_set_error_string(context, "malloc: out of memory");
3015 return ENOMEM;
3016 }
3017 result->length = l;
3018 return 0;
3019 }
3020
3021 static krb5_error_code
3022 decrypt_internal(krb5_context context,
3023 krb5_crypto crypto,
3024 void *data,
3025 size_t len,
3026 krb5_data *result,
3027 void *ivec)
3028 {
3029 krb5_error_code ret;
3030 unsigned char *p;
3031 Checksum cksum;
3032 size_t checksum_sz, l;
3033 struct encryption_type *et = crypto->et;
3034
3035 if ((len % et->padsize) != 0) {
3036 krb5_clear_error_string(context);
3037 return KRB5_BAD_MSIZE;
3038 }
3039
3040 checksum_sz = CHECKSUMSIZE(et->checksum);
3041 p = malloc(len);
3042 if(len != 0 && p == NULL) {
3043 krb5_set_error_string(context, "malloc: out of memory");
3044 return ENOMEM;
3045 }
3046 memcpy(p, data, len);
3047
3048 ret = _key_schedule(context, &crypto->key);
3049 if(ret) {
3050 free(p);
3051 return ret;
3052 }
3053 #ifdef CRYPTO_DEBUG
3054 krb5_crypto_debug(context, 0, len, crypto->key.key);
3055 #endif
3056 ret = (*et->encrypt)(context, &crypto->key, p, len, 0, 0, ivec);
3057 if (ret) {
3058 free(p);
3059 return ret;
3060 }
3061 ret = krb5_data_copy(&cksum.checksum, p + et->confoundersize, checksum_sz);
3062 if(ret) {
3063 free(p);
3064 return ret;
3065 }
3066 memset(p + et->confoundersize, 0, checksum_sz);
3067 cksum.cksumtype = CHECKSUMTYPE(et->checksum);
3068 ret = verify_checksum(context, NULL, 0, p, len, &cksum);
3069 free_Checksum(&cksum);
3070 if(ret) {
3071 free(p);
3072 return ret;
3073 }
3074 l = len - et->confoundersize - checksum_sz;
3075 memmove(p, p + et->confoundersize + checksum_sz, l);
3076 result->data = realloc(p, l);
3077 if(result->data == NULL) {
3078 free(p);
3079 krb5_set_error_string(context, "malloc: out of memory");
3080 return ENOMEM;
3081 }
3082 result->length = l;
3083 return 0;
3084 }
3085
3086 static krb5_error_code
3087 decrypt_internal_special(krb5_context context,
3088 krb5_crypto crypto,
3089 int usage,
3090 void *data,
3091 size_t len,
3092 krb5_data *result,
3093 void *ivec)
3094 {
3095 struct encryption_type *et = crypto->et;
3096 size_t cksum_sz = CHECKSUMSIZE(et->checksum);
3097 size_t sz = len - cksum_sz - et->confoundersize;
3098 unsigned char *p;
3099 krb5_error_code ret;
3100
3101 if ((len % et->padsize) != 0) {
3102 krb5_clear_error_string(context);
3103 return KRB5_BAD_MSIZE;
3104 }
3105
3106 p = malloc (len);
3107 if (p == NULL) {
3108 krb5_set_error_string(context, "malloc: out of memory");
3109 return ENOMEM;
3110 }
3111 memcpy(p, data, len);
3112
3113 ret = (*et->encrypt)(context, &crypto->key, p, len, FALSE, usage, ivec);
3114 if (ret) {
3115 free(p);
3116 return ret;
3117 }
3118
3119 memmove (p, p + cksum_sz + et->confoundersize, sz);
3120 result->data = realloc(p, sz);
3121 if(result->data == NULL) {
3122 free(p);
3123 krb5_set_error_string(context, "malloc: out of memory");
3124 return ENOMEM;
3125 }
3126 result->length = sz;
3127 return 0;
3128 }
3129
3130
3131 krb5_error_code
3132 krb5_encrypt_ivec(krb5_context context,
3133 krb5_crypto crypto,
3134 unsigned usage,
3135 void *data,
3136 size_t len,
3137 krb5_data *result,
3138 void *ivec)
3139 {
3140 if(derived_crypto(context, crypto))
3141 return encrypt_internal_derived(context, crypto, usage,
3142 data, len, result, ivec);
3143 else if (special_crypto(context, crypto))
3144 return encrypt_internal_special (context, crypto, usage,
3145 data, len, result, ivec);
3146 else
3147 return encrypt_internal(context, crypto, data, len, result, ivec);
3148 }
3149
3150 krb5_error_code
3151 krb5_encrypt(krb5_context context,
3152 krb5_crypto crypto,
3153 unsigned usage,
3154 void *data,
3155 size_t len,
3156 krb5_data *result)
3157 {
3158 return krb5_encrypt_ivec(context, crypto, usage, data, len, result, NULL);
3159 }
3160
3161 krb5_error_code
3162 krb5_encrypt_EncryptedData(krb5_context context,
3163 krb5_crypto crypto,
3164 unsigned usage,
3165 void *data,
3166 size_t len,
3167 int kvno,
3168 EncryptedData *result)
3169 {
3170 result->etype = CRYPTO_ETYPE(crypto);
3171 if(kvno){
3172 ALLOC(result->kvno, 1);
3173 *result->kvno = kvno;
3174 }else
3175 result->kvno = NULL;
3176 return krb5_encrypt(context, crypto, usage, data, len, &result->cipher);
3177 }
3178
3179 krb5_error_code
3180 krb5_decrypt_ivec(krb5_context context,
3181 krb5_crypto crypto,
3182 unsigned usage,
3183 void *data,
3184 size_t len,
3185 krb5_data *result,
3186 void *ivec)
3187 {
3188 if(derived_crypto(context, crypto))
3189 return decrypt_internal_derived(context, crypto, usage,
3190 data, len, result, ivec);
3191 else if (special_crypto (context, crypto))
3192 return decrypt_internal_special(context, crypto, usage,
3193 data, len, result, ivec);
3194 else
3195 return decrypt_internal(context, crypto, data, len, result, ivec);
3196 }
3197
3198 krb5_error_code
3199 krb5_decrypt(krb5_context context,
3200 krb5_crypto crypto,
3201 unsigned usage,
3202 void *data,
3203 size_t len,
3204 krb5_data *result)
3205 {
3206 return krb5_decrypt_ivec (context, crypto, usage, data, len, result,
3207 NULL);
3208 }
3209
3210 krb5_error_code
3211 krb5_decrypt_EncryptedData(krb5_context context,
3212 krb5_crypto crypto,
3213 unsigned usage,
3214 const EncryptedData *e,
3215 krb5_data *result)
3216 {
3217 return krb5_decrypt(context, crypto, usage,
3218 e->cipher.data, e->cipher.length, result);
3219 }
3220
3221 /************************************************************
3222 * *
3223 ************************************************************/
3224
3225 #ifdef HAVE_OPENSSL
3226 #include <openssl/rand.h>
3227
3228 /* From openssl/crypto/rand/rand_lcl.h */
3229 #define ENTROPY_NEEDED 20
3230 static int
3231 seed_something(void)
3232 {
3233 int fd = -1;
3234 char buf[1024], seedfile[256];
3235
3236 /* If there is a seed file, load it. But such a file cannot be trusted,
3237 so use 0 for the entropy estimate */
3238 if (RAND_file_name(seedfile, sizeof(seedfile))) {
3239 fd = open(seedfile, O_RDONLY);
3240 if (fd >= 0) {
3241 read(fd, buf, sizeof(buf));
3242 /* Use the full buffer anyway */
3243 RAND_add(buf, sizeof(buf), 0.0);
3244 } else
3245 seedfile[0] = '\0';
3246 } else
3247 seedfile[0] = '\0';
3248
3249 /* Calling RAND_status() will try to use /dev/urandom if it exists so
3250 we do not have to deal with it. */
3251 if (RAND_status() != 1) {
3252 krb5_context context;
3253 const char *p;
3254
3255 /* Try using egd */
3256 if (!krb5_init_context(&context)) {
3257 p = krb5_config_get_string(context, NULL, "libdefaults",
3258 "egd_socket", NULL);
3259 if (p != NULL)
3260 RAND_egd_bytes(p, ENTROPY_NEEDED);
3261 krb5_free_context(context);
3262 }
3263 }
3264
3265 if (RAND_status() == 1) {
3266 /* Update the seed file */
3267 if (seedfile[0])
3268 RAND_write_file(seedfile);
3269
3270 return 0;
3271 } else
3272 return -1;
3273 }
3274
3275 void
3276 krb5_generate_random_block(void *buf, size_t len)
3277 {
3278 static int rng_initialized = 0;
3279
3280 if (!rng_initialized) {
3281 if (seed_something())
3282 krb5_abortx(NULL, "Fatal: could not seed the random number generator");
3283
3284 rng_initialized = 1;
3285 }
3286 RAND_bytes(buf, len);
3287 }
3288
3289 #else
3290
3291 void
3292 krb5_generate_random_block(void *buf, size_t len)
3293 {
3294 des_cblock key, out;
3295 static des_cblock counter;
3296 static des_key_schedule schedule;
3297 int i;
3298 static int initialized = 0;
3299
3300 if(!initialized) {
3301 des_new_random_key(&key);
3302 des_set_key(&key, schedule);
3303 memset(&key, 0, sizeof(key));
3304 des_new_random_key(&counter);
3305 }
3306 while(len > 0) {
3307 des_ecb_encrypt(&counter, &out, schedule, DES_ENCRYPT);
3308 for(i = 7; i >=0; i--)
3309 if(counter[i]++)
3310 break;
3311 memcpy(buf, out, min(len, sizeof(out)));
3312 len -= min(len, sizeof(out));
3313 buf = (char*)buf + sizeof(out);
3314 }
3315 }
3316 #endif
3317
3318 static void
3319 DES3_postproc(krb5_context context,
3320 unsigned char *k, size_t len, struct key_data *key)
3321 {
3322 unsigned char x[24];
3323 int i, j;
3324
3325 memset(x, 0, sizeof(x));
3326 for (i = 0; i < 3; ++i) {
3327 unsigned char foo;
3328
3329 for (j = 0; j < 7; ++j) {
3330 unsigned char b = k[7 * i + j];
3331
3332 x[8 * i + j] = b;
3333 }
3334 foo = 0;
3335 for (j = 6; j >= 0; --j) {
3336 foo |= k[7 * i + j] & 1;
3337 foo <<= 1;
3338 }
3339 x[8 * i + 7] = foo;
3340 }
3341 k = key->key->keyvalue.data;
3342 memcpy(k, x, 24);
3343 memset(x, 0, sizeof(x));
3344 if (key->schedule) {
3345 krb5_free_data(context, key->schedule);
3346 key->schedule = NULL;
3347 }
3348 des_set_odd_parity((des_cblock*)k);
3349 des_set_odd_parity((des_cblock*)(k + 8));
3350 des_set_odd_parity((des_cblock*)(k + 16));
3351 }
3352
3353 static krb5_error_code
3354 derive_key(krb5_context context,
3355 struct encryption_type *et,
3356 struct key_data *key,
3357 const void *constant,
3358 size_t len)
3359 {
3360 unsigned char *k;
3361 unsigned int nblocks = 0, i;
3362 krb5_error_code ret = 0;
3363
3364 struct key_type *kt = et->keytype;
3365 ret = _key_schedule(context, key);
3366 if(ret)
3367 return ret;
3368 if(et->blocksize * 8 < kt->bits ||
3369 len != et->blocksize) {
3370 nblocks = (kt->bits + et->blocksize * 8 - 1) / (et->blocksize * 8);
3371 k = malloc(nblocks * et->blocksize);
3372 if(k == NULL) {
3373 krb5_set_error_string(context, "malloc: out of memory");
3374 return ENOMEM;
3375 }
3376 _krb5_n_fold(constant, len, k, et->blocksize);
3377 for(i = 0; i < nblocks; i++) {
3378 if(i > 0)
3379 memcpy(k + i * et->blocksize,
3380 k + (i - 1) * et->blocksize,
3381 et->blocksize);
3382 (*et->encrypt)(context, key, k + i * et->blocksize, et->blocksize,
3383 1, 0, NULL);
3384 }
3385 } else {
3386 /* this case is probably broken, but won't be run anyway */
3387 void *c = malloc(len);
3388 size_t res_len = (kt->bits + 7) / 8;
3389
3390 if(len != 0 && c == NULL) {
3391 krb5_set_error_string(context, "malloc: out of memory");
3392 return ENOMEM;
3393 }
3394 memcpy(c, constant, len);
3395 (*et->encrypt)(context, key, c, len, 1, 0, NULL);
3396 k = malloc(res_len);
3397 if(res_len != 0 && k == NULL) {
3398 free(c);
3399 krb5_set_error_string(context, "malloc: out of memory");
3400 return ENOMEM;
3401 }
3402 _krb5_n_fold(c, len, k, res_len);
3403 free(c);
3404 }
3405
3406 /* XXX keytype dependent post-processing */
3407 switch(kt->type) {
3408 case KEYTYPE_DES3:
3409 DES3_postproc(context, k, nblocks * et->blocksize, key);
3410 break;
3411 #ifdef ENABLE_AES
3412 case KEYTYPE_AES128:
3413 case KEYTYPE_AES256:
3414 memcpy(key->key->keyvalue.data, k, key->key->keyvalue.length);
3415 break;
3416 #endif /* ENABLE_AES */
3417 default:
3418 krb5_set_error_string(context,
3419 "derive_key() called with unknown keytype (%u)",
3420 kt->type);
3421 ret = KRB5_CRYPTO_INTERNAL;
3422 break;
3423 }
3424 memset(k, 0, nblocks * et->blocksize);
3425 free(k);
3426 return ret;
3427 }
3428
3429 static struct key_data *
3430 _new_derived_key(krb5_crypto crypto, unsigned usage)
3431 {
3432 struct key_usage *d = crypto->key_usage;
3433 d = realloc(d, (crypto->num_key_usage + 1) * sizeof(*d));
3434 if(d == NULL)
3435 return NULL;
3436 crypto->key_usage = d;
3437 d += crypto->num_key_usage++;
3438 memset(d, 0, sizeof(*d));
3439 d->usage = usage;
3440 return &d->key;
3441 }
3442
3443 krb5_error_code
3444 krb5_derive_key(krb5_context context,
3445 const krb5_keyblock *key,
3446 krb5_enctype etype,
3447 const void *constant,
3448 size_t constant_len,
3449 krb5_keyblock **derived_key)
3450 {
3451 krb5_error_code ret;
3452 struct encryption_type *et;
3453 struct key_data d;
3454
3455 et = _find_enctype (etype);
3456 if (et == NULL) {
3457 krb5_set_error_string(context, "encryption type %d not supported",
3458 etype);
3459 return KRB5_PROG_ETYPE_NOSUPP;
3460 }
3461
3462 ret = krb5_copy_keyblock(context, key, derived_key);
3463 if (ret)
3464 return ret;
3465
3466 d.key = *derived_key;
3467 d.schedule = NULL;
3468 ret = derive_key(context, et, &d, constant, constant_len);
3469 if (ret)
3470 return ret;
3471 ret = krb5_copy_keyblock(context, d.key, derived_key);
3472 return ret;
3473 }
3474
3475 static krb5_error_code
3476 _get_derived_key(krb5_context context,
3477 krb5_crypto crypto,
3478 unsigned usage,
3479 struct key_data **key)
3480 {
3481 int i;
3482 struct key_data *d;
3483 unsigned char constant[5];
3484
3485 for(i = 0; i < crypto->num_key_usage; i++)
3486 if(crypto->key_usage[i].usage == usage) {
3487 *key = &crypto->key_usage[i].key;
3488 return 0;
3489 }
3490 d = _new_derived_key(crypto, usage);
3491 if(d == NULL) {
3492 krb5_set_error_string(context, "malloc: out of memory");
3493 return ENOMEM;
3494 }
3495 krb5_copy_keyblock(context, crypto->key.key, &d->key);
3496 _krb5_put_int(constant, usage, 5);
3497 derive_key(context, crypto->et, d, constant, sizeof(constant));
3498 *key = d;
3499 return 0;
3500 }
3501
3502
3503 krb5_error_code
3504 krb5_crypto_init(krb5_context context,
3505 const krb5_keyblock *key,
3506 krb5_enctype etype,
3507 krb5_crypto *crypto)
3508 {
3509 krb5_error_code ret;
3510 ALLOC(*crypto, 1);
3511 if(*crypto == NULL) {
3512 krb5_set_error_string(context, "malloc: out of memory");
3513 return ENOMEM;
3514 }
3515 if(etype == ETYPE_NULL)
3516 etype = key->keytype;
3517 (*crypto)->et = _find_enctype(etype);
3518 if((*crypto)->et == NULL) {
3519 free(*crypto);
3520 krb5_set_error_string (context, "encryption type %d not supported",
3521 etype);
3522 return KRB5_PROG_ETYPE_NOSUPP;
3523 }
3524 if((*crypto)->et->keytype->size != key->keyvalue.length) {
3525 free(*crypto);
3526 krb5_set_error_string (context, "encryption key has bad length");
3527 return KRB5_BAD_KEYSIZE;
3528 }
3529 ret = krb5_copy_keyblock(context, key, &(*crypto)->key.key);
3530 if(ret) {
3531 free(*crypto);
3532 return ret;
3533 }
3534 (*crypto)->key.schedule = NULL;
3535 (*crypto)->num_key_usage = 0;
3536 (*crypto)->key_usage = NULL;
3537 return 0;
3538 }
3539
3540 static void
3541 free_key_data(krb5_context context, struct key_data *key)
3542 {
3543 krb5_free_keyblock(context, key->key);
3544 if(key->schedule) {
3545 memset(key->schedule->data, 0, key->schedule->length);
3546 krb5_free_data(context, key->schedule);
3547 }
3548 }
3549
3550 static void
3551 free_key_usage(krb5_context context, struct key_usage *ku)
3552 {
3553 free_key_data(context, &ku->key);
3554 }
3555
3556 krb5_error_code
3557 krb5_crypto_destroy(krb5_context context,
3558 krb5_crypto crypto)
3559 {
3560 int i;
3561
3562 for(i = 0; i < crypto->num_key_usage; i++)
3563 free_key_usage(context, &crypto->key_usage[i]);
3564 free(crypto->key_usage);
3565 free_key_data(context, &crypto->key);
3566 free (crypto);
3567 return 0;
3568 }
3569
3570 krb5_error_code
3571 krb5_crypto_getblocksize(krb5_context context,
3572 krb5_crypto crypto,
3573 size_t *blocksize)
3574 {
3575 *blocksize = crypto->et->blocksize;
3576 return 0;
3577 }
3578
3579 krb5_error_code
3580 krb5_string_to_key_derived(krb5_context context,
3581 const void *str,
3582 size_t len,
3583 krb5_enctype etype,
3584 krb5_keyblock *key)
3585 {
3586 struct encryption_type *et = _find_enctype(etype);
3587 krb5_error_code ret;
3588 struct key_data kd;
3589 size_t keylen = et->keytype->bits / 8;
3590 u_char *tmp;
3591
3592 if(et == NULL) {
3593 krb5_set_error_string (context, "encryption type %d not supported",
3594 etype);
3595 return KRB5_PROG_ETYPE_NOSUPP;
3596 }
3597 ALLOC(kd.key, 1);
3598 if(kd.key == NULL) {
3599 krb5_set_error_string (context, "malloc: out of memory");
3600 return ENOMEM;
3601 }
3602 ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
3603 if(ret) {
3604 free(kd.key);
3605 return ret;
3606 }
3607 kd.key->keytype = etype;
3608 tmp = malloc (keylen);
3609 if(tmp == NULL) {
3610 krb5_free_keyblock(context, kd.key);
3611 krb5_set_error_string (context, "malloc: out of memory");
3612 return ENOMEM;
3613 }
3614 _krb5_n_fold(str, len, tmp, keylen);
3615 kd.schedule = NULL;
3616 DES3_postproc (context, tmp, keylen, &kd); /* XXX */
3617 memset(tmp, 0, keylen);
3618 free(tmp);
3619 ret = derive_key(context,
3620 et,
3621 &kd,
3622 "kerberos", /* XXX well known constant */
3623 strlen("kerberos"));
3624 ret = krb5_copy_keyblock_contents(context, kd.key, key);
3625 free_key_data(context, &kd);
3626 return ret;
3627 }
3628
3629 static size_t
3630 wrapped_length (krb5_context context,
3631 krb5_crypto crypto,
3632 size_t data_len)
3633 {
3634 struct encryption_type *et = crypto->et;
3635 size_t padsize = et->padsize;
3636 size_t res;
3637
3638 res = et->confoundersize + et->checksum->checksumsize + data_len;
3639 res = (res + padsize - 1) / padsize * padsize;
3640 return res;
3641 }
3642
3643 static size_t
3644 wrapped_length_dervied (krb5_context context,
3645 krb5_crypto crypto,
3646 size_t data_len)
3647 {
3648 struct encryption_type *et = crypto->et;
3649 size_t padsize = et->padsize;
3650 size_t res;
3651
3652 res = et->confoundersize + data_len;
3653 res = (res + padsize - 1) / padsize * padsize;
3654 res += et->checksum->checksumsize;
3655 return res;
3656 }
3657
3658 /*
3659 * Return the size of an encrypted packet of length `data_len'
3660 */
3661
3662 size_t
3663 krb5_get_wrapped_length (krb5_context context,
3664 krb5_crypto crypto,
3665 size_t data_len)
3666 {
3667 if (derived_crypto (context, crypto))
3668 return wrapped_length_dervied (context, crypto, data_len);
3669 else
3670 return wrapped_length (context, crypto, data_len);
3671 }
3672
3673 #ifdef CRYPTO_DEBUG
3674
3675 static krb5_error_code
3676 krb5_get_keyid(krb5_context context,
3677 krb5_keyblock *key,
3678 u_int32_t *keyid)
3679 {
3680 MD5_CTX md5;
3681 unsigned char tmp[16];
3682
3683 MD5_Init (&md5);
3684 MD5_Update (&md5, key->keyvalue.data, key->keyvalue.length);
3685 MD5_Final (tmp, &md5);
3686 *keyid = (tmp[12] << 24) | (tmp[13] << 16) | (tmp[14] << 8) | tmp[15];
3687 return 0;
3688 }
3689
3690 static void
3691 krb5_crypto_debug(krb5_context context,
3692 int encrypt,
3693 size_t len,
3694 krb5_keyblock *key)
3695 {
3696 u_int32_t keyid;
3697 char *kt;
3698 krb5_get_keyid(context, key, &keyid);
3699 krb5_enctype_to_string(context, key->keytype, &kt);
3700 krb5_warnx(context, "%s %lu bytes with key-id %#x (%s)",
3701 encrypt ? "encrypting" : "decrypting",
3702 (unsigned long)len,
3703 keyid,
3704 kt);
3705 free(kt);
3706 }
3707
3708 #endif /* CRYPTO_DEBUG */
3709
3710 #if 0
3711 int
3712 main()
3713 {
3714 #if 0
3715 int i;
3716 krb5_context context;
3717 krb5_crypto crypto;
3718 struct key_data *d;
3719 krb5_keyblock key;
3720 char constant[4];
3721 unsigned usage = ENCRYPTION_USAGE(3);
3722 krb5_error_code ret;
3723
3724 ret = krb5_init_context(&context);
3725 if (ret)
3726 errx (1, "krb5_init_context failed: %d", ret);
3727
3728 key.keytype = ETYPE_NEW_DES3_CBC_SHA1;
3729 key.keyvalue.data = "\xb3\x85\x58\x94\xd9\xdc\x7c\xc8"
3730 "\x25\xe9\x85\xab\x3e\xb5\xfb\x0e"
3731 "\xc8\xdf\xab\x26\x86\x64\x15\x25";
3732 key.keyvalue.length = 24;
3733
3734 krb5_crypto_init(context, &key, 0, &crypto);
3735
3736 d = _new_derived_key(crypto, usage);
3737 if(d == NULL)
3738 return ENOMEM;
3739 krb5_copy_keyblock(context, crypto->key.key, &d->key);
3740 _krb5_put_int(constant, usage, 4);
3741 derive_key(context, crypto->et, d, constant, sizeof(constant));
3742 return 0;
3743 #else
3744 int i;
3745 krb5_context context;
3746 krb5_crypto crypto;
3747 struct key_data *d;
3748 krb5_keyblock key;
3749 krb5_error_code ret;
3750 Checksum res;
3751
3752 char *data = "what do ya want for nothing?";
3753
3754 ret = krb5_init_context(&context);
3755 if (ret)
3756 errx (1, "krb5_init_context failed: %d", ret);
3757
3758 key.keytype = ETYPE_NEW_DES3_CBC_SHA1;
3759 key.keyvalue.data = "Jefe";
3760 /* "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"
3761 "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"; */
3762 key.keyvalue.length = 4;
3763
3764 d = calloc(1, sizeof(*d));
3765
3766 d->key = &key;
3767 res.checksum.length = 20;
3768 res.checksum.data = malloc(res.checksum.length);
3769 SP_HMAC_SHA1_checksum(context, d, data, 28, &res);
3770
3771 return 0;
3772 #endif
3773 }
3774 #endif
DragonFly BSD