2 * Copyright (c) 1997 - 2002 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
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.
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.
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
34 #include "krb5_locl.h"
35 RCSID("$Id: crypto.c,v 1.66 2002/09/03 19:58:15 joda Exp $");
36 /* RCSID("$FreeBSD: src/crypto/heimdal/lib/krb5/crypto.c,v 1.2.2.4 2002/09/20 10:50:25 nectar Exp $"); */
37 /* RCSID("$DragonFly: src/crypto/heimdal/lib/krb5/Attic/crypto.c,v 1.2 2003/06/17 04:24:35 dillon Exp $"); */
41 static void krb5_crypto_debug(krb5_context, int, size_t, krb5_keyblock*);
55 struct krb5_crypto_data {
56 struct encryption_type *et;
59 struct key_usage *key_usage;
62 #define CRYPTO_ETYPE(C) ((C)->et->type)
64 /* bits for `flags' below */
65 #define F_KEYED 1 /* checksum is keyed */
66 #define F_CPROOF 2 /* checksum is collision proof */
67 #define F_DERIVED 4 /* uses derived keys */
68 #define F_VARIANT 8 /* uses `variant' keys (6.4.3) */
69 #define F_PSEUDO 16 /* not a real protocol type */
70 #define F_SPECIAL 32 /* backwards */
75 krb5_error_code (*string_to_key)(krb5_context, krb5_enctype, krb5_data,
76 krb5_salt, krb5_keyblock*);
80 krb5_keytype type; /* XXX */
86 krb5_enctype best_etype;
88 void (*random_key)(krb5_context, krb5_keyblock*);
89 void (*schedule)(krb5_context, struct key_data *);
90 struct salt_type *string_to_key;
93 struct checksum_type {
99 void (*checksum)(krb5_context context,
100 struct key_data *key,
101 const void *buf, size_t len,
104 krb5_error_code (*verify)(krb5_context context,
105 struct key_data *key,
106 const void *buf, size_t len,
111 struct encryption_type {
115 size_t confoundersize;
116 struct key_type *keytype;
117 struct checksum_type *checksum;
118 struct checksum_type *keyed_checksum;
120 krb5_error_code (*encrypt)(krb5_context context,
121 struct key_data *key,
122 void *data, size_t len,
123 krb5_boolean encrypt,
128 #define ENCRYPTION_USAGE(U) (((U) << 8) | 0xAA)
129 #define INTEGRITY_USAGE(U) (((U) << 8) | 0x55)
130 #define CHECKSUM_USAGE(U) (((U) << 8) | 0x99)
132 static struct checksum_type *_find_checksum(krb5_cksumtype type);
133 static struct encryption_type *_find_enctype(krb5_enctype type);
134 static struct key_type *_find_keytype(krb5_keytype type);
135 static krb5_error_code _get_derived_key(krb5_context, krb5_crypto,
136 unsigned, struct key_data**);
137 static struct key_data *_new_derived_key(krb5_crypto crypto, unsigned usage);
139 /************************************************************
141 ************************************************************/
144 krb5_DES_random_key(krb5_context context,
147 des_cblock *k = key->keyvalue.data;
149 krb5_generate_random_block(k, sizeof(des_cblock));
150 des_set_odd_parity(k);
151 } while(des_is_weak_key(k));
155 krb5_DES_schedule(krb5_context context,
156 struct key_data *key)
158 des_set_key(key->key->keyvalue.data, key->schedule->data);
162 DES_string_to_key_int(unsigned char *data, size_t length, des_cblock *key)
164 des_key_schedule schedule;
169 unsigned char swap[] = { 0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
170 0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf };
173 p = (unsigned char*)key;
174 for (i = 0; i < length; i++) {
175 unsigned char tmp = data[i];
179 *--p ^= (swap[tmp & 0xf] << 4) | swap[(tmp & 0xf0) >> 4];
183 des_set_odd_parity(key);
184 if(des_is_weak_key(key))
186 des_set_key(key, schedule);
187 des_cbc_cksum((void*)data, key, length, schedule, key);
188 memset(schedule, 0, sizeof(schedule));
189 des_set_odd_parity(key);
192 static krb5_error_code
193 krb5_DES_string_to_key(krb5_context context,
194 krb5_enctype enctype,
203 len = password.length + salt.saltvalue.length;
205 if(len > 0 && s == NULL) {
206 krb5_set_error_string(context, "malloc: out of memory");
209 memcpy(s, password.data, password.length);
210 memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
211 DES_string_to_key_int(s, len, &tmp);
212 key->keytype = enctype;
213 krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
214 memset(&tmp, 0, sizeof(tmp));
220 /* This defines the Andrew string_to_key function. It accepts a password
221 * string as input and converts its via a one-way encryption algorithm to a DES
222 * encryption key. It is compatible with the original Andrew authentication
223 * service password database.
227 * Short passwords, i.e 8 characters or less.
230 krb5_DES_AFS3_CMU_string_to_key (krb5_data pw,
234 char password[8+1]; /* crypt is limited to 8 chars anyway */
237 for(i = 0; i < 8; i++) {
238 char c = ((i < pw.length) ? ((char*)pw.data)[i] : 0) ^
240 tolower(((unsigned char*)cell.data)[i]) : 0);
241 password[i] = c ? c : 'X';
245 memcpy(key, crypt(password, "#~") + 2, sizeof(des_cblock));
247 /* parity is inserted into the LSB so left shift each byte up one
248 bit. This allows ascii characters with a zero MSB to retain as
249 much significance as possible. */
250 for (i = 0; i < sizeof(des_cblock); i++)
251 ((unsigned char*)key)[i] <<= 1;
252 des_set_odd_parity (key);
256 * Long passwords, i.e 9 characters or more.
259 krb5_DES_AFS3_Transarc_string_to_key (krb5_data pw,
263 des_key_schedule schedule;
269 memcpy(password, pw.data, min(pw.length, sizeof(password)));
270 if(pw.length < sizeof(password)) {
271 int len = min(cell.length, sizeof(password) - pw.length);
274 memcpy(password + pw.length, cell.data, len);
275 for (i = pw.length; i < pw.length + len; ++i)
276 password[i] = tolower((unsigned char)password[i]);
278 passlen = min(sizeof(password), pw.length + cell.length);
279 memcpy(&ivec, "kerberos", 8);
280 memcpy(&temp_key, "kerberos", 8);
281 des_set_odd_parity (&temp_key);
282 des_set_key (&temp_key, schedule);
283 des_cbc_cksum (password, &ivec, passlen, schedule, &ivec);
285 memcpy(&temp_key, &ivec, 8);
286 des_set_odd_parity (&temp_key);
287 des_set_key (&temp_key, schedule);
288 des_cbc_cksum (password, key, passlen, schedule, &ivec);
289 memset(&schedule, 0, sizeof(schedule));
290 memset(&temp_key, 0, sizeof(temp_key));
291 memset(&ivec, 0, sizeof(ivec));
292 memset(password, 0, sizeof(password));
294 des_set_odd_parity (key);
297 static krb5_error_code
298 DES_AFS3_string_to_key(krb5_context context,
299 krb5_enctype enctype,
305 if(password.length > 8)
306 krb5_DES_AFS3_Transarc_string_to_key(password, salt.saltvalue, &tmp);
308 krb5_DES_AFS3_CMU_string_to_key(password, salt.saltvalue, &tmp);
309 key->keytype = enctype;
310 krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
311 memset(&key, 0, sizeof(key));
316 DES3_random_key(krb5_context context,
319 des_cblock *k = key->keyvalue.data;
321 krb5_generate_random_block(k, 3 * sizeof(des_cblock));
322 des_set_odd_parity(&k[0]);
323 des_set_odd_parity(&k[1]);
324 des_set_odd_parity(&k[2]);
325 } while(des_is_weak_key(&k[0]) ||
326 des_is_weak_key(&k[1]) ||
327 des_is_weak_key(&k[2]));
331 DES3_schedule(krb5_context context,
332 struct key_data *key)
334 des_cblock *k = key->key->keyvalue.data;
335 des_key_schedule *s = key->schedule->data;
336 des_set_key(&k[0], s[0]);
337 des_set_key(&k[1], s[1]);
338 des_set_key(&k[2], s[2]);
342 * A = A xor B. A & B are 8 bytes.
346 xor (des_cblock *key, const unsigned char *b)
348 unsigned char *a = (unsigned char*)key;
359 static krb5_error_code
360 DES3_string_to_key(krb5_context context,
361 krb5_enctype enctype,
368 unsigned char tmp[24];
371 len = password.length + salt.saltvalue.length;
373 if(len != 0 && str == NULL) {
374 krb5_set_error_string(context, "malloc: out of memory");
377 memcpy(str, password.data, password.length);
378 memcpy(str + password.length, salt.saltvalue.data, salt.saltvalue.length);
381 des_key_schedule s[3];
384 _krb5_n_fold(str, len, tmp, 24);
386 for(i = 0; i < 3; i++){
387 memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
388 des_set_odd_parity(keys + i);
389 if(des_is_weak_key(keys + i))
390 xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
391 des_set_key(keys + i, s[i]);
393 memset(&ivec, 0, sizeof(ivec));
394 des_ede3_cbc_encrypt(tmp,
396 s[0], s[1], s[2], &ivec, DES_ENCRYPT);
397 memset(s, 0, sizeof(s));
398 memset(&ivec, 0, sizeof(ivec));
399 for(i = 0; i < 3; i++){
400 memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
401 des_set_odd_parity(keys + i);
402 if(des_is_weak_key(keys + i))
403 xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
405 memset(tmp, 0, sizeof(tmp));
407 key->keytype = enctype;
408 krb5_data_copy(&key->keyvalue, keys, sizeof(keys));
409 memset(keys, 0, sizeof(keys));
415 static krb5_error_code
416 DES3_string_to_key_derived(krb5_context context,
417 krb5_enctype enctype,
423 size_t len = password.length + salt.saltvalue.length;
427 if(len != 0 && s == NULL) {
428 krb5_set_error_string(context, "malloc: out of memory");
431 memcpy(s, password.data, password.length);
432 memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
433 ret = krb5_string_to_key_derived(context,
448 ARCFOUR_random_key(krb5_context context, krb5_keyblock *key)
450 krb5_generate_random_block (key->keyvalue.data,
451 key->keyvalue.length);
455 ARCFOUR_schedule(krb5_context context, struct key_data *kd)
457 RC4_set_key (kd->schedule->data,
458 kd->key->keyvalue.length, kd->key->keyvalue.data);
461 static krb5_error_code
462 ARCFOUR_string_to_key(krb5_context context,
463 krb5_enctype enctype,
473 len = 2 * password.length;
475 if (len != 0 && s == NULL) {
476 krb5_set_error_string(context, "malloc: out of memory");
479 for (p = s, i = 0; i < password.length; ++i) {
480 *p++ = ((char *)password.data)[i];
484 MD4_Update (&m, s, len);
485 key->keytype = enctype;
486 krb5_data_alloc (&key->keyvalue, 16);
487 MD4_Final (key->keyvalue.data, &m);
493 extern struct salt_type des_salt[],
494 des3_salt[], des3_salt_derived[], arcfour_salt[];
496 struct key_type keytype_null = {
507 struct key_type keytype_des = {
512 sizeof(des_key_schedule),
518 struct key_type keytype_des3 = {
522 3 * sizeof(des_cblock),
523 3 * sizeof(des_key_schedule),
529 struct key_type keytype_des3_derived = {
533 3 * sizeof(des_cblock),
534 3 * sizeof(des_key_schedule),
540 struct key_type keytype_arcfour = {
551 struct key_type *keytypes[] = {
554 &keytype_des3_derived,
559 static int num_keytypes = sizeof(keytypes) / sizeof(keytypes[0]);
561 static struct key_type *
562 _find_keytype(krb5_keytype type)
565 for(i = 0; i < num_keytypes; i++)
566 if(keytypes[i]->type == type)
572 struct salt_type des_salt[] = {
576 krb5_DES_string_to_key
581 DES_AFS3_string_to_key
586 struct salt_type des3_salt[] = {
595 struct salt_type des3_salt_derived[] = {
599 DES3_string_to_key_derived
604 struct salt_type arcfour_salt[] = {
608 ARCFOUR_string_to_key
614 krb5_salttype_to_string (krb5_context context,
619 struct encryption_type *e;
620 struct salt_type *st;
622 e = _find_enctype (etype);
624 krb5_set_error_string(context, "encryption type %d not supported",
626 return KRB5_PROG_ETYPE_NOSUPP;
628 for (st = e->keytype->string_to_key; st && st->type; st++) {
629 if (st->type == stype) {
630 *string = strdup (st->name);
631 if (*string == NULL) {
632 krb5_set_error_string(context, "malloc: out of memory");
638 krb5_set_error_string(context, "salttype %d not supported", stype);
639 return HEIM_ERR_SALTTYPE_NOSUPP;
643 krb5_string_to_salttype (krb5_context context,
646 krb5_salttype *salttype)
648 struct encryption_type *e;
649 struct salt_type *st;
651 e = _find_enctype (etype);
653 krb5_set_error_string(context, "encryption type %d not supported",
655 return KRB5_PROG_ETYPE_NOSUPP;
657 for (st = e->keytype->string_to_key; st && st->type; st++) {
658 if (strcasecmp (st->name, string) == 0) {
659 *salttype = st->type;
663 krb5_set_error_string(context, "salttype %s not supported", string);
664 return HEIM_ERR_SALTTYPE_NOSUPP;
668 krb5_get_pw_salt(krb5_context context,
669 krb5_const_principal principal,
677 salt->salttype = KRB5_PW_SALT;
678 len = strlen(principal->realm);
679 for (i = 0; i < principal->name.name_string.len; ++i)
680 len += strlen(principal->name.name_string.val[i]);
681 ret = krb5_data_alloc (&salt->saltvalue, len);
684 p = salt->saltvalue.data;
685 memcpy (p, principal->realm, strlen(principal->realm));
686 p += strlen(principal->realm);
687 for (i = 0; i < principal->name.name_string.len; ++i) {
689 principal->name.name_string.val[i],
690 strlen(principal->name.name_string.val[i]));
691 p += strlen(principal->name.name_string.val[i]);
697 krb5_free_salt(krb5_context context,
700 krb5_data_free(&salt.saltvalue);
705 krb5_string_to_key_data (krb5_context context,
706 krb5_enctype enctype,
708 krb5_principal principal,
714 ret = krb5_get_pw_salt(context, principal, &salt);
717 ret = krb5_string_to_key_data_salt(context, enctype, password, salt, key);
718 krb5_free_salt(context, salt);
723 krb5_string_to_key (krb5_context context,
724 krb5_enctype enctype,
725 const char *password,
726 krb5_principal principal,
730 pw.data = (void*)password;
731 pw.length = strlen(password);
732 return krb5_string_to_key_data(context, enctype, pw, principal, key);
736 * Do a string -> key for encryption type `enctype' operation on
737 * `password' (with salt `salt'), returning the resulting key in `key'
741 krb5_string_to_key_data_salt (krb5_context context,
742 krb5_enctype enctype,
747 struct encryption_type *et =_find_enctype(enctype);
748 struct salt_type *st;
750 krb5_set_error_string(context, "encryption type %d not supported",
752 return KRB5_PROG_ETYPE_NOSUPP;
754 for(st = et->keytype->string_to_key; st && st->type; st++)
755 if(st->type == salt.salttype)
756 return (*st->string_to_key)(context, enctype, password, salt, key);
757 krb5_set_error_string(context, "salt type %d not supported",
759 return HEIM_ERR_SALTTYPE_NOSUPP;
763 * Do a string -> key for encryption type `enctype' operation on the
764 * string `password' (with salt `salt'), returning the resulting key
769 krb5_string_to_key_salt (krb5_context context,
770 krb5_enctype enctype,
771 const char *password,
776 pw.data = (void*)password;
777 pw.length = strlen(password);
778 return krb5_string_to_key_data_salt(context, enctype, pw, salt, key);
782 krb5_keytype_to_string(krb5_context context,
783 krb5_keytype keytype,
786 struct key_type *kt = _find_keytype(keytype);
788 krb5_set_error_string(context, "key type %d not supported", keytype);
789 return KRB5_PROG_KEYTYPE_NOSUPP;
791 *string = strdup(kt->name);
792 if(*string == NULL) {
793 krb5_set_error_string(context, "malloc: out of memory");
800 krb5_string_to_keytype(krb5_context context,
802 krb5_keytype *keytype)
805 for(i = 0; i < num_keytypes; i++)
806 if(strcasecmp(keytypes[i]->name, string) == 0){
807 *keytype = keytypes[i]->type;
810 krb5_set_error_string(context, "key type %s not supported", string);
811 return KRB5_PROG_KEYTYPE_NOSUPP;
815 krb5_generate_random_keyblock(krb5_context context,
820 struct encryption_type *et = _find_enctype(type);
822 krb5_set_error_string(context, "encryption type %d not supported",
824 return KRB5_PROG_ETYPE_NOSUPP;
826 ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
830 if(et->keytype->random_key)
831 (*et->keytype->random_key)(context, key);
833 krb5_generate_random_block(key->keyvalue.data,
834 key->keyvalue.length);
838 static krb5_error_code
839 _key_schedule(krb5_context context,
840 struct key_data *key)
843 struct encryption_type *et = _find_enctype(key->key->keytype);
844 struct key_type *kt = et->keytype;
846 if(kt->schedule == NULL)
848 if (key->schedule != NULL)
850 ALLOC(key->schedule, 1);
851 if(key->schedule == NULL) {
852 krb5_set_error_string(context, "malloc: out of memory");
855 ret = krb5_data_alloc(key->schedule, kt->schedule_size);
858 key->schedule = NULL;
861 (*kt->schedule)(context, key);
865 /************************************************************
867 ************************************************************/
870 NONE_checksum(krb5_context context,
871 struct key_data *key,
880 CRC32_checksum(krb5_context context,
881 struct key_data *key,
888 unsigned char *r = C->checksum.data;
889 _krb5_crc_init_table ();
890 crc = _krb5_crc_update (data, len, 0);
892 r[1] = (crc >> 8) & 0xff;
893 r[2] = (crc >> 16) & 0xff;
894 r[3] = (crc >> 24) & 0xff;
898 RSA_MD4_checksum(krb5_context context,
899 struct key_data *key,
908 MD4_Update (&m, data, len);
909 MD4_Final (C->checksum.data, &m);
913 RSA_MD4_DES_checksum(krb5_context context,
914 struct key_data *key,
922 unsigned char *p = cksum->checksum.data;
924 krb5_generate_random_block(p, 8);
926 MD4_Update (&md4, p, 8);
927 MD4_Update (&md4, data, len);
928 MD4_Final (p + 8, &md4);
929 memset (&ivec, 0, sizeof(ivec));
938 static krb5_error_code
939 RSA_MD4_DES_verify(krb5_context context,
940 struct key_data *key,
947 unsigned char tmp[24];
948 unsigned char res[16];
950 krb5_error_code ret = 0;
952 memset(&ivec, 0, sizeof(ivec));
953 des_cbc_encrypt(C->checksum.data,
960 MD4_Update (&md4, tmp, 8); /* confounder */
961 MD4_Update (&md4, data, len);
962 MD4_Final (res, &md4);
963 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
964 krb5_clear_error_string (context);
965 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
967 memset(tmp, 0, sizeof(tmp));
968 memset(res, 0, sizeof(res));
973 RSA_MD5_checksum(krb5_context context,
974 struct key_data *key,
983 MD5_Update(&m, data, len);
984 MD5_Final (C->checksum.data, &m);
988 RSA_MD5_DES_checksum(krb5_context context,
989 struct key_data *key,
997 unsigned char *p = C->checksum.data;
999 krb5_generate_random_block(p, 8);
1001 MD5_Update (&md5, p, 8);
1002 MD5_Update (&md5, data, len);
1003 MD5_Final (p + 8, &md5);
1004 memset (&ivec, 0, sizeof(ivec));
1008 key->schedule->data,
1013 static krb5_error_code
1014 RSA_MD5_DES_verify(krb5_context context,
1015 struct key_data *key,
1022 unsigned char tmp[24];
1023 unsigned char res[16];
1025 des_key_schedule *sched = key->schedule->data;
1026 krb5_error_code ret = 0;
1028 memset(&ivec, 0, sizeof(ivec));
1029 des_cbc_encrypt(C->checksum.data,
1036 MD5_Update (&md5, tmp, 8); /* confounder */
1037 MD5_Update (&md5, data, len);
1038 MD5_Final (res, &md5);
1039 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1040 krb5_clear_error_string (context);
1041 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1043 memset(tmp, 0, sizeof(tmp));
1044 memset(res, 0, sizeof(res));
1049 RSA_MD5_DES3_checksum(krb5_context context,
1050 struct key_data *key,
1058 unsigned char *p = C->checksum.data;
1059 des_key_schedule *sched = key->schedule->data;
1061 krb5_generate_random_block(p, 8);
1063 MD5_Update (&md5, p, 8);
1064 MD5_Update (&md5, data, len);
1065 MD5_Final (p + 8, &md5);
1066 memset (&ivec, 0, sizeof(ivec));
1067 des_ede3_cbc_encrypt(p,
1070 sched[0], sched[1], sched[2],
1075 static krb5_error_code
1076 RSA_MD5_DES3_verify(krb5_context context,
1077 struct key_data *key,
1084 unsigned char tmp[24];
1085 unsigned char res[16];
1087 des_key_schedule *sched = key->schedule->data;
1088 krb5_error_code ret = 0;
1090 memset(&ivec, 0, sizeof(ivec));
1091 des_ede3_cbc_encrypt(C->checksum.data,
1094 sched[0], sched[1], sched[2],
1098 MD5_Update (&md5, tmp, 8); /* confounder */
1099 MD5_Update (&md5, data, len);
1100 MD5_Final (res, &md5);
1101 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1102 krb5_clear_error_string (context);
1103 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1105 memset(tmp, 0, sizeof(tmp));
1106 memset(res, 0, sizeof(res));
1111 SHA1_checksum(krb5_context context,
1112 struct key_data *key,
1121 SHA1_Update(&m, data, len);
1122 SHA1_Final(C->checksum.data, &m);
1125 /* HMAC according to RFC2104 */
1127 hmac(krb5_context context,
1128 struct checksum_type *cm,
1132 struct key_data *keyblock,
1135 unsigned char *ipad, *opad;
1140 if(keyblock->key->keyvalue.length > cm->blocksize){
1141 (*cm->checksum)(context,
1143 keyblock->key->keyvalue.data,
1144 keyblock->key->keyvalue.length,
1147 key = result->checksum.data;
1148 key_len = result->checksum.length;
1150 key = keyblock->key->keyvalue.data;
1151 key_len = keyblock->key->keyvalue.length;
1153 ipad = malloc(cm->blocksize + len);
1154 opad = malloc(cm->blocksize + cm->checksumsize);
1155 memset(ipad, 0x36, cm->blocksize);
1156 memset(opad, 0x5c, cm->blocksize);
1157 for(i = 0; i < key_len; i++){
1161 memcpy(ipad + cm->blocksize, data, len);
1162 (*cm->checksum)(context, keyblock, ipad, cm->blocksize + len,
1164 memcpy(opad + cm->blocksize, result->checksum.data,
1165 result->checksum.length);
1166 (*cm->checksum)(context, keyblock, opad,
1167 cm->blocksize + cm->checksumsize, usage, result);
1168 memset(ipad, 0, cm->blocksize + len);
1170 memset(opad, 0, cm->blocksize + cm->checksumsize);
1175 HMAC_SHA1_DES3_checksum(krb5_context context,
1176 struct key_data *key,
1182 struct checksum_type *c = _find_checksum(CKSUMTYPE_SHA1);
1184 hmac(context, c, data, len, usage, key, result);
1188 * checksum according to section 5. of draft-brezak-win2k-krb-rc4-hmac-03.txt
1192 HMAC_MD5_checksum(krb5_context context,
1193 struct key_data *key,
1200 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
1201 const char signature[] = "signaturekey";
1203 struct key_data ksign;
1206 unsigned char tmp[16];
1207 unsigned char ksign_c_data[16];
1209 ksign_c.checksum.length = sizeof(ksign_c_data);
1210 ksign_c.checksum.data = ksign_c_data;
1211 hmac(context, c, signature, sizeof(signature), 0, key, &ksign_c);
1213 kb.keyvalue = ksign_c.checksum;
1215 t[0] = (usage >> 0) & 0xFF;
1216 t[1] = (usage >> 8) & 0xFF;
1217 t[2] = (usage >> 16) & 0xFF;
1218 t[3] = (usage >> 24) & 0xFF;
1219 MD5_Update (&md5, t, 4);
1220 MD5_Update (&md5, data, len);
1221 MD5_Final (tmp, &md5);
1222 hmac(context, c, tmp, sizeof(tmp), 0, &ksign, result);
1226 * same as previous but being used while encrypting.
1230 HMAC_MD5_checksum_enc(krb5_context context,
1231 struct key_data *key,
1237 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
1239 struct key_data ksign;
1242 unsigned char ksign_c_data[16];
1244 t[0] = (usage >> 0) & 0xFF;
1245 t[1] = (usage >> 8) & 0xFF;
1246 t[2] = (usage >> 16) & 0xFF;
1247 t[3] = (usage >> 24) & 0xFF;
1249 ksign_c.checksum.length = sizeof(ksign_c_data);
1250 ksign_c.checksum.data = ksign_c_data;
1251 hmac(context, c, t, sizeof(t), 0, key, &ksign_c);
1253 kb.keyvalue = ksign_c.checksum;
1254 hmac(context, c, data, len, 0, &ksign, result);
1257 struct checksum_type checksum_none = {
1266 struct checksum_type checksum_crc32 = {
1275 struct checksum_type checksum_rsa_md4 = {
1284 struct checksum_type checksum_rsa_md4_des = {
1285 CKSUMTYPE_RSA_MD4_DES,
1289 F_KEYED | F_CPROOF | F_VARIANT,
1290 RSA_MD4_DES_checksum,
1294 struct checksum_type checksum_des_mac = {
1302 struct checksum_type checksum_des_mac_k = {
1303 CKSUMTYPE_DES_MAC_K,
1310 struct checksum_type checksum_rsa_md4_des_k = {
1311 CKSUMTYPE_RSA_MD4_DES_K,
1316 RSA_MD4_DES_K_checksum,
1317 RSA_MD4_DES_K_verify
1320 struct checksum_type checksum_rsa_md5 = {
1329 struct checksum_type checksum_rsa_md5_des = {
1330 CKSUMTYPE_RSA_MD5_DES,
1334 F_KEYED | F_CPROOF | F_VARIANT,
1335 RSA_MD5_DES_checksum,
1338 struct checksum_type checksum_rsa_md5_des3 = {
1339 CKSUMTYPE_RSA_MD5_DES3,
1343 F_KEYED | F_CPROOF | F_VARIANT,
1344 RSA_MD5_DES3_checksum,
1347 struct checksum_type checksum_sha1 = {
1356 struct checksum_type checksum_hmac_sha1_des3 = {
1357 CKSUMTYPE_HMAC_SHA1_DES3,
1361 F_KEYED | F_CPROOF | F_DERIVED,
1362 HMAC_SHA1_DES3_checksum,
1366 struct checksum_type checksum_hmac_md5 = {
1376 struct checksum_type checksum_hmac_md5_enc = {
1377 CKSUMTYPE_HMAC_MD5_ENC,
1381 F_KEYED | F_CPROOF | F_PSEUDO,
1382 HMAC_MD5_checksum_enc,
1386 struct checksum_type *checksum_types[] = {
1390 &checksum_rsa_md4_des,
1393 &checksum_des_mac_k,
1394 &checksum_rsa_md4_des_k,
1397 &checksum_rsa_md5_des,
1398 &checksum_rsa_md5_des3,
1400 &checksum_hmac_sha1_des3,
1402 &checksum_hmac_md5_enc
1405 static int num_checksums = sizeof(checksum_types) / sizeof(checksum_types[0]);
1407 static struct checksum_type *
1408 _find_checksum(krb5_cksumtype type)
1411 for(i = 0; i < num_checksums; i++)
1412 if(checksum_types[i]->type == type)
1413 return checksum_types[i];
1417 static krb5_error_code
1418 get_checksum_key(krb5_context context,
1420 unsigned usage, /* not krb5_key_usage */
1421 struct checksum_type *ct,
1422 struct key_data **key)
1424 krb5_error_code ret = 0;
1426 if(ct->flags & F_DERIVED)
1427 ret = _get_derived_key(context, crypto, usage, key);
1428 else if(ct->flags & F_VARIANT) {
1431 *key = _new_derived_key(crypto, 0xff/* KRB5_KU_RFC1510_VARIANT */);
1433 krb5_set_error_string(context, "malloc: out of memory");
1436 ret = krb5_copy_keyblock(context, crypto->key.key, &(*key)->key);
1439 for(i = 0; i < (*key)->key->keyvalue.length; i++)
1440 ((unsigned char*)(*key)->key->keyvalue.data)[i] ^= 0xF0;
1442 *key = &crypto->key;
1445 ret = _key_schedule(context, *key);
1449 static krb5_error_code
1450 do_checksum (krb5_context context,
1451 struct checksum_type *ct,
1458 krb5_error_code ret;
1459 struct key_data *dkey;
1462 keyed_checksum = (ct->flags & F_KEYED) != 0;
1463 if(keyed_checksum && crypto == NULL) {
1464 krb5_clear_error_string (context);
1465 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
1467 if(keyed_checksum) {
1468 ret = get_checksum_key(context, crypto, usage, ct, &dkey);
1473 result->cksumtype = ct->type;
1474 krb5_data_alloc(&result->checksum, ct->checksumsize);
1475 (*ct->checksum)(context, dkey, data, len, usage, result);
1479 static krb5_error_code
1480 create_checksum(krb5_context context,
1482 unsigned usage, /* not krb5_key_usage */
1483 krb5_cksumtype type, /* 0 -> pick from crypto */
1488 struct checksum_type *ct = NULL;
1491 ct = _find_checksum(type);
1492 } else if (crypto) {
1493 ct = crypto->et->keyed_checksum;
1495 ct = crypto->et->checksum;
1499 krb5_set_error_string (context, "checksum type %d not supported",
1501 return KRB5_PROG_SUMTYPE_NOSUPP;
1503 return do_checksum (context, ct, crypto, usage, data, len, result);
1507 krb5_create_checksum(krb5_context context,
1509 krb5_key_usage usage,
1515 return create_checksum(context, crypto,
1516 CHECKSUM_USAGE(usage),
1517 type, data, len, result);
1520 static krb5_error_code
1521 verify_checksum(krb5_context context,
1523 unsigned usage, /* not krb5_key_usage */
1528 krb5_error_code ret;
1529 struct key_data *dkey;
1532 struct checksum_type *ct;
1534 ct = _find_checksum(cksum->cksumtype);
1536 krb5_set_error_string (context, "checksum type %d not supported",
1538 return KRB5_PROG_SUMTYPE_NOSUPP;
1540 if(ct->checksumsize != cksum->checksum.length) {
1541 krb5_clear_error_string (context);
1542 return KRB5KRB_AP_ERR_BAD_INTEGRITY; /* XXX */
1544 keyed_checksum = (ct->flags & F_KEYED) != 0;
1545 if(keyed_checksum && crypto == NULL) {
1546 krb5_clear_error_string (context);
1547 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
1550 ret = get_checksum_key(context, crypto, usage, ct, &dkey);
1554 return (*ct->verify)(context, dkey, data, len, usage, cksum);
1556 ret = krb5_data_alloc (&c.checksum, ct->checksumsize);
1560 (*ct->checksum)(context, dkey, data, len, usage, &c);
1562 if(c.checksum.length != cksum->checksum.length ||
1563 memcmp(c.checksum.data, cksum->checksum.data, c.checksum.length)) {
1564 krb5_clear_error_string (context);
1565 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1569 krb5_data_free (&c.checksum);
1574 krb5_verify_checksum(krb5_context context,
1576 krb5_key_usage usage,
1581 return verify_checksum(context, crypto,
1582 CHECKSUM_USAGE(usage), data, len, cksum);
1586 krb5_checksumsize(krb5_context context,
1587 krb5_cksumtype type,
1590 struct checksum_type *ct = _find_checksum(type);
1592 krb5_set_error_string (context, "checksum type %d not supported",
1594 return KRB5_PROG_SUMTYPE_NOSUPP;
1596 *size = ct->checksumsize;
1601 krb5_checksum_is_keyed(krb5_context context,
1602 krb5_cksumtype type)
1604 struct checksum_type *ct = _find_checksum(type);
1606 krb5_set_error_string (context, "checksum type %d not supported",
1608 return KRB5_PROG_SUMTYPE_NOSUPP;
1610 return ct->flags & F_KEYED;
1614 krb5_checksum_is_collision_proof(krb5_context context,
1615 krb5_cksumtype type)
1617 struct checksum_type *ct = _find_checksum(type);
1619 krb5_set_error_string (context, "checksum type %d not supported",
1621 return KRB5_PROG_SUMTYPE_NOSUPP;
1623 return ct->flags & F_CPROOF;
1626 /************************************************************
1628 ************************************************************/
1630 static krb5_error_code
1631 NULL_encrypt(krb5_context context,
1632 struct key_data *key,
1635 krb5_boolean encrypt,
1642 static krb5_error_code
1643 DES_CBC_encrypt_null_ivec(krb5_context context,
1644 struct key_data *key,
1647 krb5_boolean encrypt,
1652 des_key_schedule *s = key->schedule->data;
1653 memset(&ivec, 0, sizeof(ivec));
1654 des_cbc_encrypt(data, data, len, *s, &ivec, encrypt);
1658 static krb5_error_code
1659 DES_CBC_encrypt_key_ivec(krb5_context context,
1660 struct key_data *key,
1663 krb5_boolean encrypt,
1668 des_key_schedule *s = key->schedule->data;
1669 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
1670 des_cbc_encrypt(data, data, len, *s, &ivec, encrypt);
1674 static krb5_error_code
1675 DES3_CBC_encrypt(krb5_context context,
1676 struct key_data *key,
1679 krb5_boolean encrypt,
1683 des_cblock local_ivec;
1684 des_key_schedule *s = key->schedule->data;
1687 memset(local_ivec, 0, sizeof(local_ivec));
1689 des_ede3_cbc_encrypt(data, data, len, s[0], s[1], s[2], ivec, encrypt);
1693 static krb5_error_code
1694 DES_CFB64_encrypt_null_ivec(krb5_context context,
1695 struct key_data *key,
1698 krb5_boolean encrypt,
1704 des_key_schedule *s = key->schedule->data;
1705 memset(&ivec, 0, sizeof(ivec));
1707 des_cfb64_encrypt(data, data, len, *s, &ivec, &num, encrypt);
1711 static krb5_error_code
1712 DES_PCBC_encrypt_key_ivec(krb5_context context,
1713 struct key_data *key,
1716 krb5_boolean encrypt,
1721 des_key_schedule *s = key->schedule->data;
1722 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
1724 des_pcbc_encrypt(data, data, len, *s, &ivec, encrypt);
1729 * section 6 of draft-brezak-win2k-krb-rc4-hmac-03
1731 * warning: not for small children
1734 static krb5_error_code
1735 ARCFOUR_subencrypt(krb5_context context,
1736 struct key_data *key,
1742 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
1743 Checksum k1_c, k2_c, k3_c, cksum;
1748 unsigned char *cdata = data;
1749 unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
1751 t[0] = (usage >> 0) & 0xFF;
1752 t[1] = (usage >> 8) & 0xFF;
1753 t[2] = (usage >> 16) & 0xFF;
1754 t[3] = (usage >> 24) & 0xFF;
1756 k1_c.checksum.length = sizeof(k1_c_data);
1757 k1_c.checksum.data = k1_c_data;
1759 hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
1761 memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
1763 k2_c.checksum.length = sizeof(k2_c_data);
1764 k2_c.checksum.data = k2_c_data;
1767 kb.keyvalue = k2_c.checksum;
1769 cksum.checksum.length = 16;
1770 cksum.checksum.data = data;
1772 hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
1775 kb.keyvalue = k1_c.checksum;
1777 k3_c.checksum.length = sizeof(k3_c_data);
1778 k3_c.checksum.data = k3_c_data;
1780 hmac(NULL, c, data, 16, 0, &ke, &k3_c);
1782 RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data);
1783 RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16);
1784 memset (k1_c_data, 0, sizeof(k1_c_data));
1785 memset (k2_c_data, 0, sizeof(k2_c_data));
1786 memset (k3_c_data, 0, sizeof(k3_c_data));
1790 static krb5_error_code
1791 ARCFOUR_subdecrypt(krb5_context context,
1792 struct key_data *key,
1798 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
1799 Checksum k1_c, k2_c, k3_c, cksum;
1804 unsigned char *cdata = data;
1805 unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
1806 unsigned char cksum_data[16];
1808 t[0] = (usage >> 0) & 0xFF;
1809 t[1] = (usage >> 8) & 0xFF;
1810 t[2] = (usage >> 16) & 0xFF;
1811 t[3] = (usage >> 24) & 0xFF;
1813 k1_c.checksum.length = sizeof(k1_c_data);
1814 k1_c.checksum.data = k1_c_data;
1816 hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
1818 memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
1820 k2_c.checksum.length = sizeof(k2_c_data);
1821 k2_c.checksum.data = k2_c_data;
1824 kb.keyvalue = k1_c.checksum;
1826 k3_c.checksum.length = sizeof(k3_c_data);
1827 k3_c.checksum.data = k3_c_data;
1829 hmac(NULL, c, cdata, 16, 0, &ke, &k3_c);
1831 RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data);
1832 RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16);
1835 kb.keyvalue = k2_c.checksum;
1837 cksum.checksum.length = 16;
1838 cksum.checksum.data = cksum_data;
1840 hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
1842 memset (k1_c_data, 0, sizeof(k1_c_data));
1843 memset (k2_c_data, 0, sizeof(k2_c_data));
1844 memset (k3_c_data, 0, sizeof(k3_c_data));
1846 if (memcmp (cksum.checksum.data, data, 16) != 0) {
1847 krb5_clear_error_string (context);
1848 return KRB5KRB_AP_ERR_BAD_INTEGRITY;
1855 * convert the usage numbers used in
1856 * draft-ietf-cat-kerb-key-derivation-00.txt to the ones in
1857 * draft-brezak-win2k-krb-rc4-hmac-03.txt
1860 static krb5_error_code
1861 usage2arcfour (krb5_context context, int *usage)
1864 case KRB5_KU_PA_ENC_TIMESTAMP :
1867 case KRB5_KU_TICKET :
1869 case KRB5_KU_AS_REP_ENC_PART :
1872 case KRB5_KU_TGS_REQ_AUTH_DAT_SESSION :
1873 case KRB5_KU_TGS_REQ_AUTH_DAT_SUBKEY :
1874 case KRB5_KU_TGS_REQ_AUTH_CKSUM :
1875 case KRB5_KU_TGS_REQ_AUTH :
1878 case KRB5_KU_TGS_REP_ENC_PART_SESSION :
1879 case KRB5_KU_TGS_REP_ENC_PART_SUB_KEY :
1882 case KRB5_KU_AP_REQ_AUTH_CKSUM :
1883 case KRB5_KU_AP_REQ_AUTH :
1884 case KRB5_KU_AP_REQ_ENC_PART :
1887 case KRB5_KU_KRB_PRIV :
1890 case KRB5_KU_KRB_CRED :
1891 case KRB5_KU_KRB_SAFE_CKSUM :
1892 case KRB5_KU_OTHER_ENCRYPTED :
1893 case KRB5_KU_OTHER_CKSUM :
1894 case KRB5_KU_KRB_ERROR :
1895 case KRB5_KU_AD_KDC_ISSUED :
1896 case KRB5_KU_MANDATORY_TICKET_EXTENSION :
1897 case KRB5_KU_AUTH_DATA_TICKET_EXTENSION :
1898 case KRB5_KU_USAGE_SEAL :
1899 case KRB5_KU_USAGE_SIGN :
1900 case KRB5_KU_USAGE_SEQ :
1902 krb5_set_error_string(context, "unknown arcfour usage type %d", *usage);
1903 return KRB5_PROG_ETYPE_NOSUPP;
1907 static krb5_error_code
1908 ARCFOUR_encrypt(krb5_context context,
1909 struct key_data *key,
1912 krb5_boolean encrypt,
1916 krb5_error_code ret;
1917 if((ret = usage2arcfour (context, &usage)) != 0)
1921 return ARCFOUR_subencrypt (context, key, data, len, usage, ivec);
1923 return ARCFOUR_subdecrypt (context, key, data, len, usage, ivec);
1928 * these should currently be in reverse preference order.
1929 * (only relevant for !F_PSEUDO) */
1931 static struct encryption_type enctype_null = {
1942 static struct encryption_type enctype_des_cbc_crc = {
1951 DES_CBC_encrypt_key_ivec,
1953 static struct encryption_type enctype_des_cbc_md4 = {
1960 &checksum_rsa_md4_des,
1962 DES_CBC_encrypt_null_ivec,
1964 static struct encryption_type enctype_des_cbc_md5 = {
1971 &checksum_rsa_md5_des,
1973 DES_CBC_encrypt_null_ivec,
1975 static struct encryption_type enctype_arcfour_hmac_md5 = {
1976 ETYPE_ARCFOUR_HMAC_MD5,
1982 &checksum_hmac_md5_enc,
1986 static struct encryption_type enctype_des3_cbc_md5 = {
1993 &checksum_rsa_md5_des3,
1997 static struct encryption_type enctype_des3_cbc_sha1 = {
1998 ETYPE_DES3_CBC_SHA1,
2002 &keytype_des3_derived,
2004 &checksum_hmac_sha1_des3,
2008 static struct encryption_type enctype_old_des3_cbc_sha1 = {
2009 ETYPE_OLD_DES3_CBC_SHA1,
2010 "old-des3-cbc-sha1",
2015 &checksum_hmac_sha1_des3,
2019 static struct encryption_type enctype_des_cbc_none = {
2028 DES_CBC_encrypt_null_ivec,
2030 static struct encryption_type enctype_des_cfb64_none = {
2031 ETYPE_DES_CFB64_NONE,
2039 DES_CFB64_encrypt_null_ivec,
2041 static struct encryption_type enctype_des_pcbc_none = {
2042 ETYPE_DES_PCBC_NONE,
2050 DES_PCBC_encrypt_key_ivec,
2052 static struct encryption_type enctype_des3_cbc_none = {
2053 ETYPE_DES3_CBC_NONE,
2057 &keytype_des3_derived,
2064 static struct encryption_type *etypes[] = {
2066 &enctype_des_cbc_crc,
2067 &enctype_des_cbc_md4,
2068 &enctype_des_cbc_md5,
2069 &enctype_arcfour_hmac_md5,
2070 &enctype_des3_cbc_md5,
2071 &enctype_des3_cbc_sha1,
2072 &enctype_old_des3_cbc_sha1,
2073 &enctype_des_cbc_none,
2074 &enctype_des_cfb64_none,
2075 &enctype_des_pcbc_none,
2076 &enctype_des3_cbc_none
2079 static unsigned num_etypes = sizeof(etypes) / sizeof(etypes[0]);
2082 static struct encryption_type *
2083 _find_enctype(krb5_enctype type)
2086 for(i = 0; i < num_etypes; i++)
2087 if(etypes[i]->type == type)
2094 krb5_enctype_to_string(krb5_context context,
2098 struct encryption_type *e;
2099 e = _find_enctype(etype);
2101 krb5_set_error_string (context, "encryption type %d not supported",
2103 return KRB5_PROG_ETYPE_NOSUPP;
2105 *string = strdup(e->name);
2106 if(*string == NULL) {
2107 krb5_set_error_string(context, "malloc: out of memory");
2114 krb5_string_to_enctype(krb5_context context,
2116 krb5_enctype *etype)
2119 for(i = 0; i < num_etypes; i++)
2120 if(strcasecmp(etypes[i]->name, string) == 0){
2121 *etype = etypes[i]->type;
2124 krb5_set_error_string (context, "encryption type %s not supported",
2126 return KRB5_PROG_ETYPE_NOSUPP;
2130 krb5_enctype_to_keytype(krb5_context context,
2132 krb5_keytype *keytype)
2134 struct encryption_type *e = _find_enctype(etype);
2136 krb5_set_error_string (context, "encryption type %d not supported",
2138 return KRB5_PROG_ETYPE_NOSUPP;
2140 *keytype = e->keytype->type; /* XXX */
2146 krb5_keytype_to_enctype(krb5_context context,
2147 krb5_keytype keytype,
2148 krb5_enctype *etype)
2150 struct key_type *kt = _find_keytype(keytype);
2151 krb5_warnx(context, "krb5_keytype_to_enctype(%u)", keytype);
2153 return KRB5_PROG_KEYTYPE_NOSUPP;
2154 *etype = kt->best_etype;
2160 krb5_keytype_to_enctypes (krb5_context context,
2161 krb5_keytype keytype,
2169 for (i = num_etypes - 1; i >= 0; --i) {
2170 if (etypes[i]->keytype->type == keytype
2171 && !(etypes[i]->flags & F_PSEUDO))
2174 ret = malloc(n * sizeof(*ret));
2175 if (ret == NULL && n != 0) {
2176 krb5_set_error_string(context, "malloc: out of memory");
2180 for (i = num_etypes - 1; i >= 0; --i) {
2181 if (etypes[i]->keytype->type == keytype
2182 && !(etypes[i]->flags & F_PSEUDO))
2183 ret[n++] = etypes[i]->type;
2191 * First take the configured list of etypes for `keytype' if available,
2192 * else, do `krb5_keytype_to_enctypes'.
2196 krb5_keytype_to_enctypes_default (krb5_context context,
2197 krb5_keytype keytype,
2204 if (keytype != KEYTYPE_DES || context->etypes_des == NULL)
2205 return krb5_keytype_to_enctypes (context, keytype, len, val);
2207 for (n = 0; context->etypes_des[n]; ++n)
2209 ret = malloc (n * sizeof(*ret));
2210 if (ret == NULL && n != 0) {
2211 krb5_set_error_string(context, "malloc: out of memory");
2214 for (i = 0; i < n; ++i)
2215 ret[i] = context->etypes_des[i];
2222 krb5_enctype_valid(krb5_context context,
2225 return _find_enctype(etype) != NULL;
2228 /* if two enctypes have compatible keys */
2230 krb5_enctypes_compatible_keys(krb5_context context,
2231 krb5_enctype etype1,
2232 krb5_enctype etype2)
2234 struct encryption_type *e1 = _find_enctype(etype1);
2235 struct encryption_type *e2 = _find_enctype(etype2);
2236 return e1 != NULL && e2 != NULL && e1->keytype == e2->keytype;
2240 derived_crypto(krb5_context context,
2243 return (crypto->et->flags & F_DERIVED) != 0;
2247 special_crypto(krb5_context context,
2250 return (crypto->et->flags & F_SPECIAL) != 0;
2253 #define CHECKSUMSIZE(C) ((C)->checksumsize)
2254 #define CHECKSUMTYPE(C) ((C)->type)
2256 static krb5_error_code
2257 encrypt_internal_derived(krb5_context context,
2265 size_t sz, block_sz, checksum_sz, total_sz;
2267 unsigned char *p, *q;
2268 krb5_error_code ret;
2269 struct key_data *dkey;
2270 const struct encryption_type *et = crypto->et;
2272 checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
2274 sz = et->confoundersize + len;
2275 block_sz = (sz + et->blocksize - 1) &~ (et->blocksize - 1); /* pad */
2276 total_sz = block_sz + checksum_sz;
2277 p = calloc(1, total_sz);
2279 krb5_set_error_string(context, "malloc: out of memory");
2284 krb5_generate_random_block(q, et->confoundersize); /* XXX */
2285 q += et->confoundersize;
2286 memcpy(q, data, len);
2288 ret = create_checksum(context,
2290 INTEGRITY_USAGE(usage),
2291 et->keyed_checksum->type,
2295 if(ret == 0 && cksum.checksum.length != checksum_sz) {
2296 free_Checksum (&cksum);
2297 krb5_clear_error_string (context);
2298 ret = KRB5_CRYPTO_INTERNAL;
2302 memcpy(p + block_sz, cksum.checksum.data, cksum.checksum.length);
2303 free_Checksum (&cksum);
2304 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
2307 ret = _key_schedule(context, dkey);
2311 krb5_crypto_debug(context, 1, block_sz, dkey->key);
2313 ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec);
2317 result->length = total_sz;
2320 memset(p, 0, total_sz);
2326 static krb5_error_code
2327 encrypt_internal(krb5_context context,
2334 size_t sz, block_sz, checksum_sz;
2336 unsigned char *p, *q;
2337 krb5_error_code ret;
2338 const struct encryption_type *et = crypto->et;
2340 checksum_sz = CHECKSUMSIZE(et->checksum);
2342 sz = et->confoundersize + checksum_sz + len;
2343 block_sz = (sz + et->blocksize - 1) &~ (et->blocksize - 1); /* pad */
2344 p = calloc(1, block_sz);
2346 krb5_set_error_string(context, "malloc: out of memory");
2351 krb5_generate_random_block(q, et->confoundersize); /* XXX */
2352 q += et->confoundersize;
2353 memset(q, 0, checksum_sz);
2355 memcpy(q, data, len);
2357 ret = create_checksum(context,
2364 if(ret == 0 && cksum.checksum.length != checksum_sz) {
2365 krb5_clear_error_string (context);
2366 free_Checksum(&cksum);
2367 ret = KRB5_CRYPTO_INTERNAL;
2371 memcpy(p + et->confoundersize, cksum.checksum.data, cksum.checksum.length);
2372 free_Checksum(&cksum);
2373 ret = _key_schedule(context, &crypto->key);
2377 krb5_crypto_debug(context, 1, block_sz, crypto->key.key);
2379 ret = (*et->encrypt)(context, &crypto->key, p, block_sz, 1, 0, ivec);
2381 memset(p, 0, block_sz);
2386 result->length = block_sz;
2389 memset(p, 0, block_sz);
2394 static krb5_error_code
2395 encrypt_internal_special(krb5_context context,
2403 struct encryption_type *et = crypto->et;
2404 size_t cksum_sz = CHECKSUMSIZE(et->checksum);
2405 size_t sz = len + cksum_sz + et->confoundersize;
2407 krb5_error_code ret;
2411 krb5_set_error_string(context, "malloc: out of memory");
2415 memset (p, 0, cksum_sz);
2417 krb5_generate_random_block(p, et->confoundersize);
2418 p += et->confoundersize;
2419 memcpy (p, data, len);
2420 ret = (*et->encrypt)(context, &crypto->key, tmp, sz, TRUE, usage, ivec);
2427 result->length = sz;
2431 static krb5_error_code
2432 decrypt_internal_derived(krb5_context context,
2443 krb5_error_code ret;
2444 struct key_data *dkey;
2445 struct encryption_type *et = crypto->et;
2448 checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
2449 if (len < checksum_sz) {
2450 krb5_clear_error_string (context);
2451 return EINVAL; /* XXX - better error code? */
2455 if(len != 0 && p == NULL) {
2456 krb5_set_error_string(context, "malloc: out of memory");
2459 memcpy(p, data, len);
2463 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
2468 ret = _key_schedule(context, dkey);
2474 krb5_crypto_debug(context, 0, len, dkey->key);
2476 ret = (*et->encrypt)(context, dkey, p, len, 0, usage, ivec);
2482 cksum.checksum.data = p + len;
2483 cksum.checksum.length = checksum_sz;
2484 cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
2486 ret = verify_checksum(context,
2488 INTEGRITY_USAGE(usage),
2496 l = len - et->confoundersize;
2497 memmove(p, p + et->confoundersize, l);
2498 result->data = realloc(p, l);
2499 if(result->data == NULL) {
2501 krb5_set_error_string(context, "malloc: out of memory");
2508 static krb5_error_code
2509 decrypt_internal(krb5_context context,
2516 krb5_error_code ret;
2519 size_t checksum_sz, l;
2520 struct encryption_type *et = crypto->et;
2522 checksum_sz = CHECKSUMSIZE(et->checksum);
2524 if(len != 0 && p == NULL) {
2525 krb5_set_error_string(context, "malloc: out of memory");
2528 memcpy(p, data, len);
2530 ret = _key_schedule(context, &crypto->key);
2536 krb5_crypto_debug(context, 0, len, crypto->key.key);
2538 ret = (*et->encrypt)(context, &crypto->key, p, len, 0, 0, ivec);
2543 ret = krb5_data_copy(&cksum.checksum, p + et->confoundersize, checksum_sz);
2548 memset(p + et->confoundersize, 0, checksum_sz);
2549 cksum.cksumtype = CHECKSUMTYPE(et->checksum);
2550 ret = verify_checksum(context, NULL, 0, p, len, &cksum);
2551 free_Checksum(&cksum);
2556 l = len - et->confoundersize - checksum_sz;
2557 memmove(p, p + et->confoundersize + checksum_sz, l);
2558 result->data = realloc(p, l);
2559 if(result->data == NULL) {
2561 krb5_set_error_string(context, "malloc: out of memory");
2568 static krb5_error_code
2569 decrypt_internal_special(krb5_context context,
2577 struct encryption_type *et = crypto->et;
2578 size_t cksum_sz = CHECKSUMSIZE(et->checksum);
2579 size_t sz = len - cksum_sz - et->confoundersize;
2580 char *cdata = (char *)data;
2582 krb5_error_code ret;
2586 krb5_set_error_string(context, "malloc: out of memory");
2590 ret = (*et->encrypt)(context, &crypto->key, data, len, FALSE, usage, ivec);
2596 memcpy (tmp, cdata + cksum_sz + et->confoundersize, sz);
2599 result->length = sz;
2605 krb5_encrypt_ivec(krb5_context context,
2613 if(derived_crypto(context, crypto))
2614 return encrypt_internal_derived(context, crypto, usage,
2615 data, len, result, ivec);
2616 else if (special_crypto(context, crypto))
2617 return encrypt_internal_special (context, crypto, usage,
2618 data, len, result, ivec);
2620 return encrypt_internal(context, crypto, data, len, result, ivec);
2624 krb5_encrypt(krb5_context context,
2631 return krb5_encrypt_ivec(context, crypto, usage, data, len, result, NULL);
2635 krb5_encrypt_EncryptedData(krb5_context context,
2641 EncryptedData *result)
2643 result->etype = CRYPTO_ETYPE(crypto);
2645 ALLOC(result->kvno, 1);
2646 *result->kvno = kvno;
2648 result->kvno = NULL;
2649 return krb5_encrypt(context, crypto, usage, data, len, &result->cipher);
2653 krb5_decrypt_ivec(krb5_context context,
2661 if(derived_crypto(context, crypto))
2662 return decrypt_internal_derived(context, crypto, usage,
2663 data, len, result, ivec);
2664 else if (special_crypto (context, crypto))
2665 return decrypt_internal_special(context, crypto, usage,
2666 data, len, result, ivec);
2668 return decrypt_internal(context, crypto, data, len, result, ivec);
2672 krb5_decrypt(krb5_context context,
2679 return krb5_decrypt_ivec (context, crypto, usage, data, len, result,
2684 krb5_decrypt_EncryptedData(krb5_context context,
2687 const EncryptedData *e,
2690 return krb5_decrypt(context, crypto, usage,
2691 e->cipher.data, e->cipher.length, result);
2694 /************************************************************
2696 ************************************************************/
2699 #include <openssl/rand.h>
2701 /* From openssl/crypto/rand/rand_lcl.h */
2702 #define ENTROPY_NEEDED 20
2704 seed_something(void)
2707 char buf[1024], seedfile[256];
2709 /* If there is a seed file, load it. But such a file cannot be trusted,
2710 so use 0 for the entropy estimate */
2711 if (RAND_file_name(seedfile, sizeof(seedfile))) {
2712 fd = open(seedfile, O_RDONLY);
2714 read(fd, buf, sizeof(buf));
2715 /* Use the full buffer anyway */
2716 RAND_add(buf, sizeof(buf), 0.0);
2722 /* Calling RAND_status() will try to use /dev/urandom if it exists so
2723 we do not have to deal with it. */
2724 if (RAND_status() != 1) {
2725 krb5_context context;
2729 if (!krb5_init_context(&context)) {
2730 p = krb5_config_get_string(context, NULL, "libdefaults",
2731 "egd_socket", NULL);
2733 RAND_egd_bytes(p, ENTROPY_NEEDED);
2734 krb5_free_context(context);
2738 if (RAND_status() == 1) {
2739 /* Update the seed file */
2741 RAND_write_file(seedfile);
2749 krb5_generate_random_block(void *buf, size_t len)
2751 static int rng_initialized = 0;
2753 if (!rng_initialized) {
2754 if (seed_something())
2755 krb5_abortx(NULL, "Fatal: could not seed the random number generator");
2757 rng_initialized = 1;
2759 RAND_bytes(buf, len);
2765 krb5_generate_random_block(void *buf, size_t len)
2767 des_cblock key, out;
2768 static des_cblock counter;
2769 static des_key_schedule schedule;
2771 static int initialized = 0;
2774 des_new_random_key(&key);
2775 des_set_key(&key, schedule);
2776 memset(&key, 0, sizeof(key));
2777 des_new_random_key(&counter);
2780 des_ecb_encrypt(&counter, &out, schedule, DES_ENCRYPT);
2781 for(i = 7; i >=0; i--)
2784 memcpy(buf, out, min(len, sizeof(out)));
2785 len -= min(len, sizeof(out));
2786 buf = (char*)buf + sizeof(out);
2792 DES3_postproc(krb5_context context,
2793 unsigned char *k, size_t len, struct key_data *key)
2795 unsigned char x[24];
2798 memset(x, 0, sizeof(x));
2799 for (i = 0; i < 3; ++i) {
2802 for (j = 0; j < 7; ++j) {
2803 unsigned char b = k[7 * i + j];
2808 for (j = 6; j >= 0; --j) {
2809 foo |= k[7 * i + j] & 1;
2814 k = key->key->keyvalue.data;
2816 memset(x, 0, sizeof(x));
2817 if (key->schedule) {
2818 krb5_free_data(context, key->schedule);
2819 key->schedule = NULL;
2821 des_set_odd_parity((des_cblock*)k);
2822 des_set_odd_parity((des_cblock*)(k + 8));
2823 des_set_odd_parity((des_cblock*)(k + 16));
2826 static krb5_error_code
2827 derive_key(krb5_context context,
2828 struct encryption_type *et,
2829 struct key_data *key,
2830 const void *constant,
2834 unsigned int nblocks = 0, i;
2835 krb5_error_code ret = 0;
2837 struct key_type *kt = et->keytype;
2838 ret = _key_schedule(context, key);
2841 if(et->blocksize * 8 < kt->bits ||
2842 len != et->blocksize) {
2843 nblocks = (kt->bits + et->blocksize * 8 - 1) / (et->blocksize * 8);
2844 k = malloc(nblocks * et->blocksize);
2846 krb5_set_error_string(context, "malloc: out of memory");
2849 _krb5_n_fold(constant, len, k, et->blocksize);
2850 for(i = 0; i < nblocks; i++) {
2852 memcpy(k + i * et->blocksize,
2853 k + (i - 1) * et->blocksize,
2855 (*et->encrypt)(context, key, k + i * et->blocksize, et->blocksize,
2859 /* this case is probably broken, but won't be run anyway */
2860 void *c = malloc(len);
2861 size_t res_len = (kt->bits + 7) / 8;
2863 if(len != 0 && c == NULL) {
2864 krb5_set_error_string(context, "malloc: out of memory");
2867 memcpy(c, constant, len);
2868 (*et->encrypt)(context, key, c, len, 1, 0, NULL);
2869 k = malloc(res_len);
2870 if(res_len != 0 && k == NULL) {
2872 krb5_set_error_string(context, "malloc: out of memory");
2875 _krb5_n_fold(c, len, k, res_len);
2879 /* XXX keytype dependent post-processing */
2882 DES3_postproc(context, k, nblocks * et->blocksize, key);
2885 krb5_set_error_string(context,
2886 "derive_key() called with unknown keytype (%u)",
2888 ret = KRB5_CRYPTO_INTERNAL;
2891 memset(k, 0, nblocks * et->blocksize);
2896 static struct key_data *
2897 _new_derived_key(krb5_crypto crypto, unsigned usage)
2899 struct key_usage *d = crypto->key_usage;
2900 d = realloc(d, (crypto->num_key_usage + 1) * sizeof(*d));
2903 crypto->key_usage = d;
2904 d += crypto->num_key_usage++;
2905 memset(d, 0, sizeof(*d));
2911 krb5_derive_key(krb5_context context,
2912 const krb5_keyblock *key,
2914 const void *constant,
2915 size_t constant_len,
2916 krb5_keyblock **derived_key)
2918 krb5_error_code ret;
2919 struct encryption_type *et;
2922 et = _find_enctype (etype);
2924 krb5_set_error_string(context, "encryption type %d not supported",
2926 return KRB5_PROG_ETYPE_NOSUPP;
2929 ret = krb5_copy_keyblock(context, key, derived_key);
2933 d.key = *derived_key;
2935 ret = derive_key(context, et, &d, constant, constant_len);
2938 ret = krb5_copy_keyblock(context, d.key, derived_key);
2942 static krb5_error_code
2943 _get_derived_key(krb5_context context,
2946 struct key_data **key)
2950 unsigned char constant[5];
2952 for(i = 0; i < crypto->num_key_usage; i++)
2953 if(crypto->key_usage[i].usage == usage) {
2954 *key = &crypto->key_usage[i].key;
2957 d = _new_derived_key(crypto, usage);
2959 krb5_set_error_string(context, "malloc: out of memory");
2962 krb5_copy_keyblock(context, crypto->key.key, &d->key);
2963 _krb5_put_int(constant, usage, 5);
2964 derive_key(context, crypto->et, d, constant, sizeof(constant));
2971 krb5_crypto_init(krb5_context context,
2972 const krb5_keyblock *key,
2974 krb5_crypto *crypto)
2976 krb5_error_code ret;
2978 if(*crypto == NULL) {
2979 krb5_set_error_string(context, "malloc: out of memory");
2982 if(etype == ETYPE_NULL)
2983 etype = key->keytype;
2984 (*crypto)->et = _find_enctype(etype);
2985 if((*crypto)->et == NULL) {
2987 krb5_set_error_string (context, "encryption type %d not supported",
2989 return KRB5_PROG_ETYPE_NOSUPP;
2991 if((*crypto)->et->keytype->size != key->keyvalue.length) {
2993 krb5_set_error_string (context, "encryption key has bad length");
2994 return KRB5_BAD_KEYSIZE;
2996 ret = krb5_copy_keyblock(context, key, &(*crypto)->key.key);
3001 (*crypto)->key.schedule = NULL;
3002 (*crypto)->num_key_usage = 0;
3003 (*crypto)->key_usage = NULL;
3008 free_key_data(krb5_context context, struct key_data *key)
3010 krb5_free_keyblock(context, key->key);
3012 memset(key->schedule->data, 0, key->schedule->length);
3013 krb5_free_data(context, key->schedule);
3018 free_key_usage(krb5_context context, struct key_usage *ku)
3020 free_key_data(context, &ku->key);
3024 krb5_crypto_destroy(krb5_context context,
3029 for(i = 0; i < crypto->num_key_usage; i++)
3030 free_key_usage(context, &crypto->key_usage[i]);
3031 free(crypto->key_usage);
3032 free_key_data(context, &crypto->key);
3038 krb5_crypto_getblocksize(krb5_context context,
3042 *blocksize = crypto->et->blocksize;
3047 krb5_string_to_key_derived(krb5_context context,
3053 struct encryption_type *et = _find_enctype(etype);
3054 krb5_error_code ret;
3056 size_t keylen = et->keytype->bits / 8;
3060 krb5_set_error_string (context, "encryption type %d not supported",
3062 return KRB5_PROG_ETYPE_NOSUPP;
3065 if(kd.key == NULL) {
3066 krb5_set_error_string (context, "malloc: out of memory");
3069 ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
3074 kd.key->keytype = etype;
3075 tmp = malloc (keylen);
3077 krb5_free_keyblock(context, kd.key);
3078 krb5_set_error_string (context, "malloc: out of memory");
3081 _krb5_n_fold(str, len, tmp, keylen);
3083 DES3_postproc (context, tmp, keylen, &kd); /* XXX */
3084 memset(tmp, 0, keylen);
3086 ret = derive_key(context,
3089 "kerberos", /* XXX well known constant */
3090 strlen("kerberos"));
3091 ret = krb5_copy_keyblock_contents(context, kd.key, key);
3092 free_key_data(context, &kd);
3097 wrapped_length (krb5_context context,
3101 struct encryption_type *et = crypto->et;
3102 size_t blocksize = et->blocksize;
3105 res = et->confoundersize + et->checksum->checksumsize + data_len;
3106 res = (res + blocksize - 1) / blocksize * blocksize;
3111 wrapped_length_dervied (krb5_context context,
3115 struct encryption_type *et = crypto->et;
3116 size_t blocksize = et->blocksize;
3119 res = et->confoundersize + data_len;
3120 res = (res + blocksize - 1) / blocksize * blocksize;
3121 res += et->checksum->checksumsize;
3126 * Return the size of an encrypted packet of length `data_len'
3130 krb5_get_wrapped_length (krb5_context context,
3134 if (derived_crypto (context, crypto))
3135 return wrapped_length_dervied (context, crypto, data_len);
3137 return wrapped_length (context, crypto, data_len);
3142 static krb5_error_code
3143 krb5_get_keyid(krb5_context context,
3148 unsigned char tmp[16];
3151 MD5_Update (&md5, key->keyvalue.data, key->keyvalue.length);
3152 MD5_Final (tmp, &md5);
3153 *keyid = (tmp[12] << 24) | (tmp[13] << 16) | (tmp[14] << 8) | tmp[15];
3158 krb5_crypto_debug(krb5_context context,
3165 krb5_get_keyid(context, key, &keyid);
3166 krb5_enctype_to_string(context, key->keytype, &kt);
3167 krb5_warnx(context, "%s %lu bytes with key-id %#x (%s)",
3168 encrypt ? "encrypting" : "decrypting",
3175 #endif /* CRYPTO_DEBUG */
3183 krb5_context context;
3188 unsigned usage = ENCRYPTION_USAGE(3);
3189 krb5_error_code ret;
3191 ret = krb5_init_context(&context);
3193 errx (1, "krb5_init_context failed: %d", ret);
3195 key.keytype = ETYPE_NEW_DES3_CBC_SHA1;
3196 key.keyvalue.data = "\xb3\x85\x58\x94\xd9\xdc\x7c\xc8"
3197 "\x25\xe9\x85\xab\x3e\xb5\xfb\x0e"
3198 "\xc8\xdf\xab\x26\x86\x64\x15\x25";
3199 key.keyvalue.length = 24;
3201 krb5_crypto_init(context, &key, 0, &crypto);
3203 d = _new_derived_key(crypto, usage);
3206 krb5_copy_keyblock(context, crypto->key.key, &d->key);
3207 _krb5_put_int(constant, usage, 4);
3208 derive_key(context, crypto->et, d, constant, sizeof(constant));
3212 krb5_context context;
3216 krb5_error_code ret;
3219 char *data = "what do ya want for nothing?";
3221 ret = krb5_init_context(&context);
3223 errx (1, "krb5_init_context failed: %d", ret);
3225 key.keytype = ETYPE_NEW_DES3_CBC_SHA1;
3226 key.keyvalue.data = "Jefe";
3227 /* "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"
3228 "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"; */
3229 key.keyvalue.length = 4;
3231 d = calloc(1, sizeof(*d));
3234 res.checksum.length = 20;
3235 res.checksum.data = malloc(res.checksum.length);
3236 HMAC_SHA1_DES3_checksum(context, d, data, 28, &res);