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 $"); */
40 static void krb5_crypto_debug(krb5_context, int, size_t, krb5_keyblock*);
54 struct krb5_crypto_data {
55 struct encryption_type *et;
58 struct key_usage *key_usage;
61 #define CRYPTO_ETYPE(C) ((C)->et->type)
63 /* bits for `flags' below */
64 #define F_KEYED 1 /* checksum is keyed */
65 #define F_CPROOF 2 /* checksum is collision proof */
66 #define F_DERIVED 4 /* uses derived keys */
67 #define F_VARIANT 8 /* uses `variant' keys (6.4.3) */
68 #define F_PSEUDO 16 /* not a real protocol type */
69 #define F_SPECIAL 32 /* backwards */
74 krb5_error_code (*string_to_key)(krb5_context, krb5_enctype, krb5_data,
75 krb5_salt, krb5_keyblock*);
79 krb5_keytype type; /* XXX */
85 krb5_enctype best_etype;
87 void (*random_key)(krb5_context, krb5_keyblock*);
88 void (*schedule)(krb5_context, struct key_data *);
89 struct salt_type *string_to_key;
92 struct checksum_type {
98 void (*checksum)(krb5_context context,
100 const void *buf, size_t len,
103 krb5_error_code (*verify)(krb5_context context,
104 struct key_data *key,
105 const void *buf, size_t len,
110 struct encryption_type {
114 size_t confoundersize;
115 struct key_type *keytype;
116 struct checksum_type *checksum;
117 struct checksum_type *keyed_checksum;
119 krb5_error_code (*encrypt)(krb5_context context,
120 struct key_data *key,
121 void *data, size_t len,
122 krb5_boolean encrypt,
127 #define ENCRYPTION_USAGE(U) (((U) << 8) | 0xAA)
128 #define INTEGRITY_USAGE(U) (((U) << 8) | 0x55)
129 #define CHECKSUM_USAGE(U) (((U) << 8) | 0x99)
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);
138 /************************************************************
140 ************************************************************/
143 krb5_DES_random_key(krb5_context context,
146 des_cblock *k = key->keyvalue.data;
148 krb5_generate_random_block(k, sizeof(des_cblock));
149 des_set_odd_parity(k);
150 } while(des_is_weak_key(k));
154 krb5_DES_schedule(krb5_context context,
155 struct key_data *key)
157 des_set_key(key->key->keyvalue.data, key->schedule->data);
161 DES_string_to_key_int(unsigned char *data, size_t length, des_cblock *key)
163 des_key_schedule schedule;
168 unsigned char swap[] = { 0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
169 0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf };
172 p = (unsigned char*)key;
173 for (i = 0; i < length; i++) {
174 unsigned char tmp = data[i];
178 *--p ^= (swap[tmp & 0xf] << 4) | swap[(tmp & 0xf0) >> 4];
182 des_set_odd_parity(key);
183 if(des_is_weak_key(key))
185 des_set_key(key, schedule);
186 des_cbc_cksum((void*)data, key, length, schedule, key);
187 memset(schedule, 0, sizeof(schedule));
188 des_set_odd_parity(key);
191 static krb5_error_code
192 krb5_DES_string_to_key(krb5_context context,
193 krb5_enctype enctype,
202 len = password.length + salt.saltvalue.length;
204 if(len > 0 && s == NULL) {
205 krb5_set_error_string(context, "malloc: out of memory");
208 memcpy(s, password.data, password.length);
209 memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
210 DES_string_to_key_int(s, len, &tmp);
211 key->keytype = enctype;
212 krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
213 memset(&tmp, 0, sizeof(tmp));
219 /* This defines the Andrew string_to_key function. It accepts a password
220 * string as input and converts its via a one-way encryption algorithm to a DES
221 * encryption key. It is compatible with the original Andrew authentication
222 * service password database.
226 * Short passwords, i.e 8 characters or less.
229 krb5_DES_AFS3_CMU_string_to_key (krb5_data pw,
233 char password[8+1]; /* crypt is limited to 8 chars anyway */
236 for(i = 0; i < 8; i++) {
237 char c = ((i < pw.length) ? ((char*)pw.data)[i] : 0) ^
239 tolower(((unsigned char*)cell.data)[i]) : 0);
240 password[i] = c ? c : 'X';
244 memcpy(key, crypt(password, "#~") + 2, sizeof(des_cblock));
246 /* parity is inserted into the LSB so left shift each byte up one
247 bit. This allows ascii characters with a zero MSB to retain as
248 much significance as possible. */
249 for (i = 0; i < sizeof(des_cblock); i++)
250 ((unsigned char*)key)[i] <<= 1;
251 des_set_odd_parity (key);
255 * Long passwords, i.e 9 characters or more.
258 krb5_DES_AFS3_Transarc_string_to_key (krb5_data pw,
262 des_key_schedule schedule;
268 memcpy(password, pw.data, min(pw.length, sizeof(password)));
269 if(pw.length < sizeof(password)) {
270 int len = min(cell.length, sizeof(password) - pw.length);
273 memcpy(password + pw.length, cell.data, len);
274 for (i = pw.length; i < pw.length + len; ++i)
275 password[i] = tolower((unsigned char)password[i]);
277 passlen = min(sizeof(password), pw.length + cell.length);
278 memcpy(&ivec, "kerberos", 8);
279 memcpy(&temp_key, "kerberos", 8);
280 des_set_odd_parity (&temp_key);
281 des_set_key (&temp_key, schedule);
282 des_cbc_cksum (password, &ivec, passlen, schedule, &ivec);
284 memcpy(&temp_key, &ivec, 8);
285 des_set_odd_parity (&temp_key);
286 des_set_key (&temp_key, schedule);
287 des_cbc_cksum (password, key, passlen, schedule, &ivec);
288 memset(&schedule, 0, sizeof(schedule));
289 memset(&temp_key, 0, sizeof(temp_key));
290 memset(&ivec, 0, sizeof(ivec));
291 memset(password, 0, sizeof(password));
293 des_set_odd_parity (key);
296 static krb5_error_code
297 DES_AFS3_string_to_key(krb5_context context,
298 krb5_enctype enctype,
304 if(password.length > 8)
305 krb5_DES_AFS3_Transarc_string_to_key(password, salt.saltvalue, &tmp);
307 krb5_DES_AFS3_CMU_string_to_key(password, salt.saltvalue, &tmp);
308 key->keytype = enctype;
309 krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
310 memset(&key, 0, sizeof(key));
315 DES3_random_key(krb5_context context,
318 des_cblock *k = key->keyvalue.data;
320 krb5_generate_random_block(k, 3 * sizeof(des_cblock));
321 des_set_odd_parity(&k[0]);
322 des_set_odd_parity(&k[1]);
323 des_set_odd_parity(&k[2]);
324 } while(des_is_weak_key(&k[0]) ||
325 des_is_weak_key(&k[1]) ||
326 des_is_weak_key(&k[2]));
330 DES3_schedule(krb5_context context,
331 struct key_data *key)
333 des_cblock *k = key->key->keyvalue.data;
334 des_key_schedule *s = key->schedule->data;
335 des_set_key(&k[0], s[0]);
336 des_set_key(&k[1], s[1]);
337 des_set_key(&k[2], s[2]);
341 * A = A xor B. A & B are 8 bytes.
345 xor (des_cblock *key, const unsigned char *b)
347 unsigned char *a = (unsigned char*)key;
358 static krb5_error_code
359 DES3_string_to_key(krb5_context context,
360 krb5_enctype enctype,
367 unsigned char tmp[24];
370 len = password.length + salt.saltvalue.length;
372 if(len != 0 && str == NULL) {
373 krb5_set_error_string(context, "malloc: out of memory");
376 memcpy(str, password.data, password.length);
377 memcpy(str + password.length, salt.saltvalue.data, salt.saltvalue.length);
380 des_key_schedule s[3];
383 _krb5_n_fold(str, len, tmp, 24);
385 for(i = 0; i < 3; i++){
386 memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
387 des_set_odd_parity(keys + i);
388 if(des_is_weak_key(keys + i))
389 xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
390 des_set_key(keys + i, s[i]);
392 memset(&ivec, 0, sizeof(ivec));
393 des_ede3_cbc_encrypt(tmp,
395 s[0], s[1], s[2], &ivec, DES_ENCRYPT);
396 memset(s, 0, sizeof(s));
397 memset(&ivec, 0, sizeof(ivec));
398 for(i = 0; i < 3; i++){
399 memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
400 des_set_odd_parity(keys + i);
401 if(des_is_weak_key(keys + i))
402 xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
404 memset(tmp, 0, sizeof(tmp));
406 key->keytype = enctype;
407 krb5_data_copy(&key->keyvalue, keys, sizeof(keys));
408 memset(keys, 0, sizeof(keys));
414 static krb5_error_code
415 DES3_string_to_key_derived(krb5_context context,
416 krb5_enctype enctype,
422 size_t len = password.length + salt.saltvalue.length;
426 if(len != 0 && s == NULL) {
427 krb5_set_error_string(context, "malloc: out of memory");
430 memcpy(s, password.data, password.length);
431 memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
432 ret = krb5_string_to_key_derived(context,
447 ARCFOUR_random_key(krb5_context context, krb5_keyblock *key)
449 krb5_generate_random_block (key->keyvalue.data,
450 key->keyvalue.length);
454 ARCFOUR_schedule(krb5_context context, struct key_data *kd)
456 RC4_set_key (kd->schedule->data,
457 kd->key->keyvalue.length, kd->key->keyvalue.data);
460 static krb5_error_code
461 ARCFOUR_string_to_key(krb5_context context,
462 krb5_enctype enctype,
472 len = 2 * password.length;
474 if (len != 0 && s == NULL) {
475 krb5_set_error_string(context, "malloc: out of memory");
478 for (p = s, i = 0; i < password.length; ++i) {
479 *p++ = ((char *)password.data)[i];
483 MD4_Update (&m, s, len);
484 key->keytype = enctype;
485 krb5_data_alloc (&key->keyvalue, 16);
486 MD4_Final (key->keyvalue.data, &m);
492 extern struct salt_type des_salt[],
493 des3_salt[], des3_salt_derived[], arcfour_salt[];
495 struct key_type keytype_null = {
506 struct key_type keytype_des = {
511 sizeof(des_key_schedule),
517 struct key_type keytype_des3 = {
521 3 * sizeof(des_cblock),
522 3 * sizeof(des_key_schedule),
528 struct key_type keytype_des3_derived = {
532 3 * sizeof(des_cblock),
533 3 * sizeof(des_key_schedule),
539 struct key_type keytype_arcfour = {
550 struct key_type *keytypes[] = {
553 &keytype_des3_derived,
558 static int num_keytypes = sizeof(keytypes) / sizeof(keytypes[0]);
560 static struct key_type *
561 _find_keytype(krb5_keytype type)
564 for(i = 0; i < num_keytypes; i++)
565 if(keytypes[i]->type == type)
571 struct salt_type des_salt[] = {
575 krb5_DES_string_to_key
580 DES_AFS3_string_to_key
585 struct salt_type des3_salt[] = {
594 struct salt_type des3_salt_derived[] = {
598 DES3_string_to_key_derived
603 struct salt_type arcfour_salt[] = {
607 ARCFOUR_string_to_key
613 krb5_salttype_to_string (krb5_context context,
618 struct encryption_type *e;
619 struct salt_type *st;
621 e = _find_enctype (etype);
623 krb5_set_error_string(context, "encryption type %d not supported",
625 return KRB5_PROG_ETYPE_NOSUPP;
627 for (st = e->keytype->string_to_key; st && st->type; st++) {
628 if (st->type == stype) {
629 *string = strdup (st->name);
630 if (*string == NULL) {
631 krb5_set_error_string(context, "malloc: out of memory");
637 krb5_set_error_string(context, "salttype %d not supported", stype);
638 return HEIM_ERR_SALTTYPE_NOSUPP;
642 krb5_string_to_salttype (krb5_context context,
645 krb5_salttype *salttype)
647 struct encryption_type *e;
648 struct salt_type *st;
650 e = _find_enctype (etype);
652 krb5_set_error_string(context, "encryption type %d not supported",
654 return KRB5_PROG_ETYPE_NOSUPP;
656 for (st = e->keytype->string_to_key; st && st->type; st++) {
657 if (strcasecmp (st->name, string) == 0) {
658 *salttype = st->type;
662 krb5_set_error_string(context, "salttype %s not supported", string);
663 return HEIM_ERR_SALTTYPE_NOSUPP;
667 krb5_get_pw_salt(krb5_context context,
668 krb5_const_principal principal,
676 salt->salttype = KRB5_PW_SALT;
677 len = strlen(principal->realm);
678 for (i = 0; i < principal->name.name_string.len; ++i)
679 len += strlen(principal->name.name_string.val[i]);
680 ret = krb5_data_alloc (&salt->saltvalue, len);
683 p = salt->saltvalue.data;
684 memcpy (p, principal->realm, strlen(principal->realm));
685 p += strlen(principal->realm);
686 for (i = 0; i < principal->name.name_string.len; ++i) {
688 principal->name.name_string.val[i],
689 strlen(principal->name.name_string.val[i]));
690 p += strlen(principal->name.name_string.val[i]);
696 krb5_free_salt(krb5_context context,
699 krb5_data_free(&salt.saltvalue);
704 krb5_string_to_key_data (krb5_context context,
705 krb5_enctype enctype,
707 krb5_principal principal,
713 ret = krb5_get_pw_salt(context, principal, &salt);
716 ret = krb5_string_to_key_data_salt(context, enctype, password, salt, key);
717 krb5_free_salt(context, salt);
722 krb5_string_to_key (krb5_context context,
723 krb5_enctype enctype,
724 const char *password,
725 krb5_principal principal,
729 pw.data = (void*)password;
730 pw.length = strlen(password);
731 return krb5_string_to_key_data(context, enctype, pw, principal, key);
735 * Do a string -> key for encryption type `enctype' operation on
736 * `password' (with salt `salt'), returning the resulting key in `key'
740 krb5_string_to_key_data_salt (krb5_context context,
741 krb5_enctype enctype,
746 struct encryption_type *et =_find_enctype(enctype);
747 struct salt_type *st;
749 krb5_set_error_string(context, "encryption type %d not supported",
751 return KRB5_PROG_ETYPE_NOSUPP;
753 for(st = et->keytype->string_to_key; st && st->type; st++)
754 if(st->type == salt.salttype)
755 return (*st->string_to_key)(context, enctype, password, salt, key);
756 krb5_set_error_string(context, "salt type %d not supported",
758 return HEIM_ERR_SALTTYPE_NOSUPP;
762 * Do a string -> key for encryption type `enctype' operation on the
763 * string `password' (with salt `salt'), returning the resulting key
768 krb5_string_to_key_salt (krb5_context context,
769 krb5_enctype enctype,
770 const char *password,
775 pw.data = (void*)password;
776 pw.length = strlen(password);
777 return krb5_string_to_key_data_salt(context, enctype, pw, salt, key);
781 krb5_keytype_to_string(krb5_context context,
782 krb5_keytype keytype,
785 struct key_type *kt = _find_keytype(keytype);
787 krb5_set_error_string(context, "key type %d not supported", keytype);
788 return KRB5_PROG_KEYTYPE_NOSUPP;
790 *string = strdup(kt->name);
791 if(*string == NULL) {
792 krb5_set_error_string(context, "malloc: out of memory");
799 krb5_string_to_keytype(krb5_context context,
801 krb5_keytype *keytype)
804 for(i = 0; i < num_keytypes; i++)
805 if(strcasecmp(keytypes[i]->name, string) == 0){
806 *keytype = keytypes[i]->type;
809 krb5_set_error_string(context, "key type %s not supported", string);
810 return KRB5_PROG_KEYTYPE_NOSUPP;
814 krb5_generate_random_keyblock(krb5_context context,
819 struct encryption_type *et = _find_enctype(type);
821 krb5_set_error_string(context, "encryption type %d not supported",
823 return KRB5_PROG_ETYPE_NOSUPP;
825 ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
829 if(et->keytype->random_key)
830 (*et->keytype->random_key)(context, key);
832 krb5_generate_random_block(key->keyvalue.data,
833 key->keyvalue.length);
837 static krb5_error_code
838 _key_schedule(krb5_context context,
839 struct key_data *key)
842 struct encryption_type *et = _find_enctype(key->key->keytype);
843 struct key_type *kt = et->keytype;
845 if(kt->schedule == NULL)
847 if (key->schedule != NULL)
849 ALLOC(key->schedule, 1);
850 if(key->schedule == NULL) {
851 krb5_set_error_string(context, "malloc: out of memory");
854 ret = krb5_data_alloc(key->schedule, kt->schedule_size);
857 key->schedule = NULL;
860 (*kt->schedule)(context, key);
864 /************************************************************
866 ************************************************************/
869 NONE_checksum(krb5_context context,
870 struct key_data *key,
879 CRC32_checksum(krb5_context context,
880 struct key_data *key,
887 unsigned char *r = C->checksum.data;
888 _krb5_crc_init_table ();
889 crc = _krb5_crc_update (data, len, 0);
891 r[1] = (crc >> 8) & 0xff;
892 r[2] = (crc >> 16) & 0xff;
893 r[3] = (crc >> 24) & 0xff;
897 RSA_MD4_checksum(krb5_context context,
898 struct key_data *key,
907 MD4_Update (&m, data, len);
908 MD4_Final (C->checksum.data, &m);
912 RSA_MD4_DES_checksum(krb5_context context,
913 struct key_data *key,
921 unsigned char *p = cksum->checksum.data;
923 krb5_generate_random_block(p, 8);
925 MD4_Update (&md4, p, 8);
926 MD4_Update (&md4, data, len);
927 MD4_Final (p + 8, &md4);
928 memset (&ivec, 0, sizeof(ivec));
937 static krb5_error_code
938 RSA_MD4_DES_verify(krb5_context context,
939 struct key_data *key,
946 unsigned char tmp[24];
947 unsigned char res[16];
949 krb5_error_code ret = 0;
951 memset(&ivec, 0, sizeof(ivec));
952 des_cbc_encrypt(C->checksum.data,
959 MD4_Update (&md4, tmp, 8); /* confounder */
960 MD4_Update (&md4, data, len);
961 MD4_Final (res, &md4);
962 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
963 krb5_clear_error_string (context);
964 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
966 memset(tmp, 0, sizeof(tmp));
967 memset(res, 0, sizeof(res));
972 RSA_MD5_checksum(krb5_context context,
973 struct key_data *key,
982 MD5_Update(&m, data, len);
983 MD5_Final (C->checksum.data, &m);
987 RSA_MD5_DES_checksum(krb5_context context,
988 struct key_data *key,
996 unsigned char *p = C->checksum.data;
998 krb5_generate_random_block(p, 8);
1000 MD5_Update (&md5, p, 8);
1001 MD5_Update (&md5, data, len);
1002 MD5_Final (p + 8, &md5);
1003 memset (&ivec, 0, sizeof(ivec));
1007 key->schedule->data,
1012 static krb5_error_code
1013 RSA_MD5_DES_verify(krb5_context context,
1014 struct key_data *key,
1021 unsigned char tmp[24];
1022 unsigned char res[16];
1024 des_key_schedule *sched = key->schedule->data;
1025 krb5_error_code ret = 0;
1027 memset(&ivec, 0, sizeof(ivec));
1028 des_cbc_encrypt(C->checksum.data,
1035 MD5_Update (&md5, tmp, 8); /* confounder */
1036 MD5_Update (&md5, data, len);
1037 MD5_Final (res, &md5);
1038 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1039 krb5_clear_error_string (context);
1040 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1042 memset(tmp, 0, sizeof(tmp));
1043 memset(res, 0, sizeof(res));
1048 RSA_MD5_DES3_checksum(krb5_context context,
1049 struct key_data *key,
1057 unsigned char *p = C->checksum.data;
1058 des_key_schedule *sched = key->schedule->data;
1060 krb5_generate_random_block(p, 8);
1062 MD5_Update (&md5, p, 8);
1063 MD5_Update (&md5, data, len);
1064 MD5_Final (p + 8, &md5);
1065 memset (&ivec, 0, sizeof(ivec));
1066 des_ede3_cbc_encrypt(p,
1069 sched[0], sched[1], sched[2],
1074 static krb5_error_code
1075 RSA_MD5_DES3_verify(krb5_context context,
1076 struct key_data *key,
1083 unsigned char tmp[24];
1084 unsigned char res[16];
1086 des_key_schedule *sched = key->schedule->data;
1087 krb5_error_code ret = 0;
1089 memset(&ivec, 0, sizeof(ivec));
1090 des_ede3_cbc_encrypt(C->checksum.data,
1093 sched[0], sched[1], sched[2],
1097 MD5_Update (&md5, tmp, 8); /* confounder */
1098 MD5_Update (&md5, data, len);
1099 MD5_Final (res, &md5);
1100 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1101 krb5_clear_error_string (context);
1102 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1104 memset(tmp, 0, sizeof(tmp));
1105 memset(res, 0, sizeof(res));
1110 SHA1_checksum(krb5_context context,
1111 struct key_data *key,
1120 SHA1_Update(&m, data, len);
1121 SHA1_Final(C->checksum.data, &m);
1124 /* HMAC according to RFC2104 */
1126 hmac(krb5_context context,
1127 struct checksum_type *cm,
1131 struct key_data *keyblock,
1134 unsigned char *ipad, *opad;
1139 if(keyblock->key->keyvalue.length > cm->blocksize){
1140 (*cm->checksum)(context,
1142 keyblock->key->keyvalue.data,
1143 keyblock->key->keyvalue.length,
1146 key = result->checksum.data;
1147 key_len = result->checksum.length;
1149 key = keyblock->key->keyvalue.data;
1150 key_len = keyblock->key->keyvalue.length;
1152 ipad = malloc(cm->blocksize + len);
1153 opad = malloc(cm->blocksize + cm->checksumsize);
1154 memset(ipad, 0x36, cm->blocksize);
1155 memset(opad, 0x5c, cm->blocksize);
1156 for(i = 0; i < key_len; i++){
1160 memcpy(ipad + cm->blocksize, data, len);
1161 (*cm->checksum)(context, keyblock, ipad, cm->blocksize + len,
1163 memcpy(opad + cm->blocksize, result->checksum.data,
1164 result->checksum.length);
1165 (*cm->checksum)(context, keyblock, opad,
1166 cm->blocksize + cm->checksumsize, usage, result);
1167 memset(ipad, 0, cm->blocksize + len);
1169 memset(opad, 0, cm->blocksize + cm->checksumsize);
1174 HMAC_SHA1_DES3_checksum(krb5_context context,
1175 struct key_data *key,
1181 struct checksum_type *c = _find_checksum(CKSUMTYPE_SHA1);
1183 hmac(context, c, data, len, usage, key, result);
1187 * checksum according to section 5. of draft-brezak-win2k-krb-rc4-hmac-03.txt
1191 HMAC_MD5_checksum(krb5_context context,
1192 struct key_data *key,
1199 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
1200 const char signature[] = "signaturekey";
1202 struct key_data ksign;
1205 unsigned char tmp[16];
1206 unsigned char ksign_c_data[16];
1208 ksign_c.checksum.length = sizeof(ksign_c_data);
1209 ksign_c.checksum.data = ksign_c_data;
1210 hmac(context, c, signature, sizeof(signature), 0, key, &ksign_c);
1212 kb.keyvalue = ksign_c.checksum;
1214 t[0] = (usage >> 0) & 0xFF;
1215 t[1] = (usage >> 8) & 0xFF;
1216 t[2] = (usage >> 16) & 0xFF;
1217 t[3] = (usage >> 24) & 0xFF;
1218 MD5_Update (&md5, t, 4);
1219 MD5_Update (&md5, data, len);
1220 MD5_Final (tmp, &md5);
1221 hmac(context, c, tmp, sizeof(tmp), 0, &ksign, result);
1225 * same as previous but being used while encrypting.
1229 HMAC_MD5_checksum_enc(krb5_context context,
1230 struct key_data *key,
1236 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
1238 struct key_data ksign;
1241 unsigned char ksign_c_data[16];
1243 t[0] = (usage >> 0) & 0xFF;
1244 t[1] = (usage >> 8) & 0xFF;
1245 t[2] = (usage >> 16) & 0xFF;
1246 t[3] = (usage >> 24) & 0xFF;
1248 ksign_c.checksum.length = sizeof(ksign_c_data);
1249 ksign_c.checksum.data = ksign_c_data;
1250 hmac(context, c, t, sizeof(t), 0, key, &ksign_c);
1252 kb.keyvalue = ksign_c.checksum;
1253 hmac(context, c, data, len, 0, &ksign, result);
1256 struct checksum_type checksum_none = {
1265 struct checksum_type checksum_crc32 = {
1274 struct checksum_type checksum_rsa_md4 = {
1283 struct checksum_type checksum_rsa_md4_des = {
1284 CKSUMTYPE_RSA_MD4_DES,
1288 F_KEYED | F_CPROOF | F_VARIANT,
1289 RSA_MD4_DES_checksum,
1293 struct checksum_type checksum_des_mac = {
1301 struct checksum_type checksum_des_mac_k = {
1302 CKSUMTYPE_DES_MAC_K,
1309 struct checksum_type checksum_rsa_md4_des_k = {
1310 CKSUMTYPE_RSA_MD4_DES_K,
1315 RSA_MD4_DES_K_checksum,
1316 RSA_MD4_DES_K_verify
1319 struct checksum_type checksum_rsa_md5 = {
1328 struct checksum_type checksum_rsa_md5_des = {
1329 CKSUMTYPE_RSA_MD5_DES,
1333 F_KEYED | F_CPROOF | F_VARIANT,
1334 RSA_MD5_DES_checksum,
1337 struct checksum_type checksum_rsa_md5_des3 = {
1338 CKSUMTYPE_RSA_MD5_DES3,
1342 F_KEYED | F_CPROOF | F_VARIANT,
1343 RSA_MD5_DES3_checksum,
1346 struct checksum_type checksum_sha1 = {
1355 struct checksum_type checksum_hmac_sha1_des3 = {
1356 CKSUMTYPE_HMAC_SHA1_DES3,
1360 F_KEYED | F_CPROOF | F_DERIVED,
1361 HMAC_SHA1_DES3_checksum,
1365 struct checksum_type checksum_hmac_md5 = {
1375 struct checksum_type checksum_hmac_md5_enc = {
1376 CKSUMTYPE_HMAC_MD5_ENC,
1380 F_KEYED | F_CPROOF | F_PSEUDO,
1381 HMAC_MD5_checksum_enc,
1385 struct checksum_type *checksum_types[] = {
1389 &checksum_rsa_md4_des,
1392 &checksum_des_mac_k,
1393 &checksum_rsa_md4_des_k,
1396 &checksum_rsa_md5_des,
1397 &checksum_rsa_md5_des3,
1399 &checksum_hmac_sha1_des3,
1401 &checksum_hmac_md5_enc
1404 static int num_checksums = sizeof(checksum_types) / sizeof(checksum_types[0]);
1406 static struct checksum_type *
1407 _find_checksum(krb5_cksumtype type)
1410 for(i = 0; i < num_checksums; i++)
1411 if(checksum_types[i]->type == type)
1412 return checksum_types[i];
1416 static krb5_error_code
1417 get_checksum_key(krb5_context context,
1419 unsigned usage, /* not krb5_key_usage */
1420 struct checksum_type *ct,
1421 struct key_data **key)
1423 krb5_error_code ret = 0;
1425 if(ct->flags & F_DERIVED)
1426 ret = _get_derived_key(context, crypto, usage, key);
1427 else if(ct->flags & F_VARIANT) {
1430 *key = _new_derived_key(crypto, 0xff/* KRB5_KU_RFC1510_VARIANT */);
1432 krb5_set_error_string(context, "malloc: out of memory");
1435 ret = krb5_copy_keyblock(context, crypto->key.key, &(*key)->key);
1438 for(i = 0; i < (*key)->key->keyvalue.length; i++)
1439 ((unsigned char*)(*key)->key->keyvalue.data)[i] ^= 0xF0;
1441 *key = &crypto->key;
1444 ret = _key_schedule(context, *key);
1448 static krb5_error_code
1449 do_checksum (krb5_context context,
1450 struct checksum_type *ct,
1457 krb5_error_code ret;
1458 struct key_data *dkey;
1461 keyed_checksum = (ct->flags & F_KEYED) != 0;
1462 if(keyed_checksum && crypto == NULL) {
1463 krb5_clear_error_string (context);
1464 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
1466 if(keyed_checksum) {
1467 ret = get_checksum_key(context, crypto, usage, ct, &dkey);
1472 result->cksumtype = ct->type;
1473 krb5_data_alloc(&result->checksum, ct->checksumsize);
1474 (*ct->checksum)(context, dkey, data, len, usage, result);
1478 static krb5_error_code
1479 create_checksum(krb5_context context,
1481 unsigned usage, /* not krb5_key_usage */
1482 krb5_cksumtype type, /* 0 -> pick from crypto */
1487 struct checksum_type *ct = NULL;
1490 ct = _find_checksum(type);
1491 } else if (crypto) {
1492 ct = crypto->et->keyed_checksum;
1494 ct = crypto->et->checksum;
1498 krb5_set_error_string (context, "checksum type %d not supported",
1500 return KRB5_PROG_SUMTYPE_NOSUPP;
1502 return do_checksum (context, ct, crypto, usage, data, len, result);
1506 krb5_create_checksum(krb5_context context,
1508 krb5_key_usage usage,
1514 return create_checksum(context, crypto,
1515 CHECKSUM_USAGE(usage),
1516 type, data, len, result);
1519 static krb5_error_code
1520 verify_checksum(krb5_context context,
1522 unsigned usage, /* not krb5_key_usage */
1527 krb5_error_code ret;
1528 struct key_data *dkey;
1531 struct checksum_type *ct;
1533 ct = _find_checksum(cksum->cksumtype);
1535 krb5_set_error_string (context, "checksum type %d not supported",
1537 return KRB5_PROG_SUMTYPE_NOSUPP;
1539 if(ct->checksumsize != cksum->checksum.length) {
1540 krb5_clear_error_string (context);
1541 return KRB5KRB_AP_ERR_BAD_INTEGRITY; /* XXX */
1543 keyed_checksum = (ct->flags & F_KEYED) != 0;
1544 if(keyed_checksum && crypto == NULL) {
1545 krb5_clear_error_string (context);
1546 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
1549 ret = get_checksum_key(context, crypto, usage, ct, &dkey);
1553 return (*ct->verify)(context, dkey, data, len, usage, cksum);
1555 ret = krb5_data_alloc (&c.checksum, ct->checksumsize);
1559 (*ct->checksum)(context, dkey, data, len, usage, &c);
1561 if(c.checksum.length != cksum->checksum.length ||
1562 memcmp(c.checksum.data, cksum->checksum.data, c.checksum.length)) {
1563 krb5_clear_error_string (context);
1564 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1568 krb5_data_free (&c.checksum);
1573 krb5_verify_checksum(krb5_context context,
1575 krb5_key_usage usage,
1580 return verify_checksum(context, crypto,
1581 CHECKSUM_USAGE(usage), data, len, cksum);
1585 krb5_checksumsize(krb5_context context,
1586 krb5_cksumtype type,
1589 struct checksum_type *ct = _find_checksum(type);
1591 krb5_set_error_string (context, "checksum type %d not supported",
1593 return KRB5_PROG_SUMTYPE_NOSUPP;
1595 *size = ct->checksumsize;
1600 krb5_checksum_is_keyed(krb5_context context,
1601 krb5_cksumtype type)
1603 struct checksum_type *ct = _find_checksum(type);
1605 krb5_set_error_string (context, "checksum type %d not supported",
1607 return KRB5_PROG_SUMTYPE_NOSUPP;
1609 return ct->flags & F_KEYED;
1613 krb5_checksum_is_collision_proof(krb5_context context,
1614 krb5_cksumtype type)
1616 struct checksum_type *ct = _find_checksum(type);
1618 krb5_set_error_string (context, "checksum type %d not supported",
1620 return KRB5_PROG_SUMTYPE_NOSUPP;
1622 return ct->flags & F_CPROOF;
1625 /************************************************************
1627 ************************************************************/
1629 static krb5_error_code
1630 NULL_encrypt(krb5_context context,
1631 struct key_data *key,
1634 krb5_boolean encrypt,
1641 static krb5_error_code
1642 DES_CBC_encrypt_null_ivec(krb5_context context,
1643 struct key_data *key,
1646 krb5_boolean encrypt,
1651 des_key_schedule *s = key->schedule->data;
1652 memset(&ivec, 0, sizeof(ivec));
1653 des_cbc_encrypt(data, data, len, *s, &ivec, encrypt);
1657 static krb5_error_code
1658 DES_CBC_encrypt_key_ivec(krb5_context context,
1659 struct key_data *key,
1662 krb5_boolean encrypt,
1667 des_key_schedule *s = key->schedule->data;
1668 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
1669 des_cbc_encrypt(data, data, len, *s, &ivec, encrypt);
1673 static krb5_error_code
1674 DES3_CBC_encrypt(krb5_context context,
1675 struct key_data *key,
1678 krb5_boolean encrypt,
1682 des_cblock local_ivec;
1683 des_key_schedule *s = key->schedule->data;
1686 memset(local_ivec, 0, sizeof(local_ivec));
1688 des_ede3_cbc_encrypt(data, data, len, s[0], s[1], s[2], ivec, encrypt);
1692 static krb5_error_code
1693 DES_CFB64_encrypt_null_ivec(krb5_context context,
1694 struct key_data *key,
1697 krb5_boolean encrypt,
1703 des_key_schedule *s = key->schedule->data;
1704 memset(&ivec, 0, sizeof(ivec));
1706 des_cfb64_encrypt(data, data, len, *s, &ivec, &num, encrypt);
1710 static krb5_error_code
1711 DES_PCBC_encrypt_key_ivec(krb5_context context,
1712 struct key_data *key,
1715 krb5_boolean encrypt,
1720 des_key_schedule *s = key->schedule->data;
1721 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
1723 des_pcbc_encrypt(data, data, len, *s, &ivec, encrypt);
1728 * section 6 of draft-brezak-win2k-krb-rc4-hmac-03
1730 * warning: not for small children
1733 static krb5_error_code
1734 ARCFOUR_subencrypt(krb5_context context,
1735 struct key_data *key,
1741 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
1742 Checksum k1_c, k2_c, k3_c, cksum;
1747 unsigned char *cdata = data;
1748 unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
1750 t[0] = (usage >> 0) & 0xFF;
1751 t[1] = (usage >> 8) & 0xFF;
1752 t[2] = (usage >> 16) & 0xFF;
1753 t[3] = (usage >> 24) & 0xFF;
1755 k1_c.checksum.length = sizeof(k1_c_data);
1756 k1_c.checksum.data = k1_c_data;
1758 hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
1760 memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
1762 k2_c.checksum.length = sizeof(k2_c_data);
1763 k2_c.checksum.data = k2_c_data;
1766 kb.keyvalue = k2_c.checksum;
1768 cksum.checksum.length = 16;
1769 cksum.checksum.data = data;
1771 hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
1774 kb.keyvalue = k1_c.checksum;
1776 k3_c.checksum.length = sizeof(k3_c_data);
1777 k3_c.checksum.data = k3_c_data;
1779 hmac(NULL, c, data, 16, 0, &ke, &k3_c);
1781 RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data);
1782 RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16);
1783 memset (k1_c_data, 0, sizeof(k1_c_data));
1784 memset (k2_c_data, 0, sizeof(k2_c_data));
1785 memset (k3_c_data, 0, sizeof(k3_c_data));
1789 static krb5_error_code
1790 ARCFOUR_subdecrypt(krb5_context context,
1791 struct key_data *key,
1797 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
1798 Checksum k1_c, k2_c, k3_c, cksum;
1803 unsigned char *cdata = data;
1804 unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
1805 unsigned char cksum_data[16];
1807 t[0] = (usage >> 0) & 0xFF;
1808 t[1] = (usage >> 8) & 0xFF;
1809 t[2] = (usage >> 16) & 0xFF;
1810 t[3] = (usage >> 24) & 0xFF;
1812 k1_c.checksum.length = sizeof(k1_c_data);
1813 k1_c.checksum.data = k1_c_data;
1815 hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
1817 memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
1819 k2_c.checksum.length = sizeof(k2_c_data);
1820 k2_c.checksum.data = k2_c_data;
1823 kb.keyvalue = k1_c.checksum;
1825 k3_c.checksum.length = sizeof(k3_c_data);
1826 k3_c.checksum.data = k3_c_data;
1828 hmac(NULL, c, cdata, 16, 0, &ke, &k3_c);
1830 RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data);
1831 RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16);
1834 kb.keyvalue = k2_c.checksum;
1836 cksum.checksum.length = 16;
1837 cksum.checksum.data = cksum_data;
1839 hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
1841 memset (k1_c_data, 0, sizeof(k1_c_data));
1842 memset (k2_c_data, 0, sizeof(k2_c_data));
1843 memset (k3_c_data, 0, sizeof(k3_c_data));
1845 if (memcmp (cksum.checksum.data, data, 16) != 0) {
1846 krb5_clear_error_string (context);
1847 return KRB5KRB_AP_ERR_BAD_INTEGRITY;
1854 * convert the usage numbers used in
1855 * draft-ietf-cat-kerb-key-derivation-00.txt to the ones in
1856 * draft-brezak-win2k-krb-rc4-hmac-03.txt
1859 static krb5_error_code
1860 usage2arcfour (krb5_context context, int *usage)
1863 case KRB5_KU_PA_ENC_TIMESTAMP :
1866 case KRB5_KU_TICKET :
1868 case KRB5_KU_AS_REP_ENC_PART :
1871 case KRB5_KU_TGS_REQ_AUTH_DAT_SESSION :
1872 case KRB5_KU_TGS_REQ_AUTH_DAT_SUBKEY :
1873 case KRB5_KU_TGS_REQ_AUTH_CKSUM :
1874 case KRB5_KU_TGS_REQ_AUTH :
1877 case KRB5_KU_TGS_REP_ENC_PART_SESSION :
1878 case KRB5_KU_TGS_REP_ENC_PART_SUB_KEY :
1881 case KRB5_KU_AP_REQ_AUTH_CKSUM :
1882 case KRB5_KU_AP_REQ_AUTH :
1883 case KRB5_KU_AP_REQ_ENC_PART :
1886 case KRB5_KU_KRB_PRIV :
1889 case KRB5_KU_KRB_CRED :
1890 case KRB5_KU_KRB_SAFE_CKSUM :
1891 case KRB5_KU_OTHER_ENCRYPTED :
1892 case KRB5_KU_OTHER_CKSUM :
1893 case KRB5_KU_KRB_ERROR :
1894 case KRB5_KU_AD_KDC_ISSUED :
1895 case KRB5_KU_MANDATORY_TICKET_EXTENSION :
1896 case KRB5_KU_AUTH_DATA_TICKET_EXTENSION :
1897 case KRB5_KU_USAGE_SEAL :
1898 case KRB5_KU_USAGE_SIGN :
1899 case KRB5_KU_USAGE_SEQ :
1901 krb5_set_error_string(context, "unknown arcfour usage type %d", *usage);
1902 return KRB5_PROG_ETYPE_NOSUPP;
1906 static krb5_error_code
1907 ARCFOUR_encrypt(krb5_context context,
1908 struct key_data *key,
1911 krb5_boolean encrypt,
1915 krb5_error_code ret;
1916 if((ret = usage2arcfour (context, &usage)) != 0)
1920 return ARCFOUR_subencrypt (context, key, data, len, usage, ivec);
1922 return ARCFOUR_subdecrypt (context, key, data, len, usage, ivec);
1927 * these should currently be in reverse preference order.
1928 * (only relevant for !F_PSEUDO) */
1930 static struct encryption_type enctype_null = {
1941 static struct encryption_type enctype_des_cbc_crc = {
1950 DES_CBC_encrypt_key_ivec,
1952 static struct encryption_type enctype_des_cbc_md4 = {
1959 &checksum_rsa_md4_des,
1961 DES_CBC_encrypt_null_ivec,
1963 static struct encryption_type enctype_des_cbc_md5 = {
1970 &checksum_rsa_md5_des,
1972 DES_CBC_encrypt_null_ivec,
1974 static struct encryption_type enctype_arcfour_hmac_md5 = {
1975 ETYPE_ARCFOUR_HMAC_MD5,
1981 &checksum_hmac_md5_enc,
1985 static struct encryption_type enctype_des3_cbc_md5 = {
1992 &checksum_rsa_md5_des3,
1996 static struct encryption_type enctype_des3_cbc_sha1 = {
1997 ETYPE_DES3_CBC_SHA1,
2001 &keytype_des3_derived,
2003 &checksum_hmac_sha1_des3,
2007 static struct encryption_type enctype_old_des3_cbc_sha1 = {
2008 ETYPE_OLD_DES3_CBC_SHA1,
2009 "old-des3-cbc-sha1",
2014 &checksum_hmac_sha1_des3,
2018 static struct encryption_type enctype_des_cbc_none = {
2027 DES_CBC_encrypt_null_ivec,
2029 static struct encryption_type enctype_des_cfb64_none = {
2030 ETYPE_DES_CFB64_NONE,
2038 DES_CFB64_encrypt_null_ivec,
2040 static struct encryption_type enctype_des_pcbc_none = {
2041 ETYPE_DES_PCBC_NONE,
2049 DES_PCBC_encrypt_key_ivec,
2051 static struct encryption_type enctype_des3_cbc_none = {
2052 ETYPE_DES3_CBC_NONE,
2056 &keytype_des3_derived,
2063 static struct encryption_type *etypes[] = {
2065 &enctype_des_cbc_crc,
2066 &enctype_des_cbc_md4,
2067 &enctype_des_cbc_md5,
2068 &enctype_arcfour_hmac_md5,
2069 &enctype_des3_cbc_md5,
2070 &enctype_des3_cbc_sha1,
2071 &enctype_old_des3_cbc_sha1,
2072 &enctype_des_cbc_none,
2073 &enctype_des_cfb64_none,
2074 &enctype_des_pcbc_none,
2075 &enctype_des3_cbc_none
2078 static unsigned num_etypes = sizeof(etypes) / sizeof(etypes[0]);
2081 static struct encryption_type *
2082 _find_enctype(krb5_enctype type)
2085 for(i = 0; i < num_etypes; i++)
2086 if(etypes[i]->type == type)
2093 krb5_enctype_to_string(krb5_context context,
2097 struct encryption_type *e;
2098 e = _find_enctype(etype);
2100 krb5_set_error_string (context, "encryption type %d not supported",
2102 return KRB5_PROG_ETYPE_NOSUPP;
2104 *string = strdup(e->name);
2105 if(*string == NULL) {
2106 krb5_set_error_string(context, "malloc: out of memory");
2113 krb5_string_to_enctype(krb5_context context,
2115 krb5_enctype *etype)
2118 for(i = 0; i < num_etypes; i++)
2119 if(strcasecmp(etypes[i]->name, string) == 0){
2120 *etype = etypes[i]->type;
2123 krb5_set_error_string (context, "encryption type %s not supported",
2125 return KRB5_PROG_ETYPE_NOSUPP;
2129 krb5_enctype_to_keytype(krb5_context context,
2131 krb5_keytype *keytype)
2133 struct encryption_type *e = _find_enctype(etype);
2135 krb5_set_error_string (context, "encryption type %d not supported",
2137 return KRB5_PROG_ETYPE_NOSUPP;
2139 *keytype = e->keytype->type; /* XXX */
2145 krb5_keytype_to_enctype(krb5_context context,
2146 krb5_keytype keytype,
2147 krb5_enctype *etype)
2149 struct key_type *kt = _find_keytype(keytype);
2150 krb5_warnx(context, "krb5_keytype_to_enctype(%u)", keytype);
2152 return KRB5_PROG_KEYTYPE_NOSUPP;
2153 *etype = kt->best_etype;
2159 krb5_keytype_to_enctypes (krb5_context context,
2160 krb5_keytype keytype,
2168 for (i = num_etypes - 1; i >= 0; --i) {
2169 if (etypes[i]->keytype->type == keytype
2170 && !(etypes[i]->flags & F_PSEUDO))
2173 ret = malloc(n * sizeof(*ret));
2174 if (ret == NULL && n != 0) {
2175 krb5_set_error_string(context, "malloc: out of memory");
2179 for (i = num_etypes - 1; i >= 0; --i) {
2180 if (etypes[i]->keytype->type == keytype
2181 && !(etypes[i]->flags & F_PSEUDO))
2182 ret[n++] = etypes[i]->type;
2190 * First take the configured list of etypes for `keytype' if available,
2191 * else, do `krb5_keytype_to_enctypes'.
2195 krb5_keytype_to_enctypes_default (krb5_context context,
2196 krb5_keytype keytype,
2203 if (keytype != KEYTYPE_DES || context->etypes_des == NULL)
2204 return krb5_keytype_to_enctypes (context, keytype, len, val);
2206 for (n = 0; context->etypes_des[n]; ++n)
2208 ret = malloc (n * sizeof(*ret));
2209 if (ret == NULL && n != 0) {
2210 krb5_set_error_string(context, "malloc: out of memory");
2213 for (i = 0; i < n; ++i)
2214 ret[i] = context->etypes_des[i];
2221 krb5_enctype_valid(krb5_context context,
2224 return _find_enctype(etype) != NULL;
2227 /* if two enctypes have compatible keys */
2229 krb5_enctypes_compatible_keys(krb5_context context,
2230 krb5_enctype etype1,
2231 krb5_enctype etype2)
2233 struct encryption_type *e1 = _find_enctype(etype1);
2234 struct encryption_type *e2 = _find_enctype(etype2);
2235 return e1 != NULL && e2 != NULL && e1->keytype == e2->keytype;
2239 derived_crypto(krb5_context context,
2242 return (crypto->et->flags & F_DERIVED) != 0;
2246 special_crypto(krb5_context context,
2249 return (crypto->et->flags & F_SPECIAL) != 0;
2252 #define CHECKSUMSIZE(C) ((C)->checksumsize)
2253 #define CHECKSUMTYPE(C) ((C)->type)
2255 static krb5_error_code
2256 encrypt_internal_derived(krb5_context context,
2264 size_t sz, block_sz, checksum_sz, total_sz;
2266 unsigned char *p, *q;
2267 krb5_error_code ret;
2268 struct key_data *dkey;
2269 const struct encryption_type *et = crypto->et;
2271 checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
2273 sz = et->confoundersize + len;
2274 block_sz = (sz + et->blocksize - 1) &~ (et->blocksize - 1); /* pad */
2275 total_sz = block_sz + checksum_sz;
2276 p = calloc(1, total_sz);
2278 krb5_set_error_string(context, "malloc: out of memory");
2283 krb5_generate_random_block(q, et->confoundersize); /* XXX */
2284 q += et->confoundersize;
2285 memcpy(q, data, len);
2287 ret = create_checksum(context,
2289 INTEGRITY_USAGE(usage),
2290 et->keyed_checksum->type,
2294 if(ret == 0 && cksum.checksum.length != checksum_sz) {
2295 free_Checksum (&cksum);
2296 krb5_clear_error_string (context);
2297 ret = KRB5_CRYPTO_INTERNAL;
2301 memcpy(p + block_sz, cksum.checksum.data, cksum.checksum.length);
2302 free_Checksum (&cksum);
2303 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
2306 ret = _key_schedule(context, dkey);
2310 krb5_crypto_debug(context, 1, block_sz, dkey->key);
2312 ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec);
2316 result->length = total_sz;
2319 memset(p, 0, total_sz);
2325 static krb5_error_code
2326 encrypt_internal(krb5_context context,
2333 size_t sz, block_sz, checksum_sz;
2335 unsigned char *p, *q;
2336 krb5_error_code ret;
2337 const struct encryption_type *et = crypto->et;
2339 checksum_sz = CHECKSUMSIZE(et->checksum);
2341 sz = et->confoundersize + checksum_sz + len;
2342 block_sz = (sz + et->blocksize - 1) &~ (et->blocksize - 1); /* pad */
2343 p = calloc(1, block_sz);
2345 krb5_set_error_string(context, "malloc: out of memory");
2350 krb5_generate_random_block(q, et->confoundersize); /* XXX */
2351 q += et->confoundersize;
2352 memset(q, 0, checksum_sz);
2354 memcpy(q, data, len);
2356 ret = create_checksum(context,
2363 if(ret == 0 && cksum.checksum.length != checksum_sz) {
2364 krb5_clear_error_string (context);
2365 free_Checksum(&cksum);
2366 ret = KRB5_CRYPTO_INTERNAL;
2370 memcpy(p + et->confoundersize, cksum.checksum.data, cksum.checksum.length);
2371 free_Checksum(&cksum);
2372 ret = _key_schedule(context, &crypto->key);
2376 krb5_crypto_debug(context, 1, block_sz, crypto->key.key);
2378 ret = (*et->encrypt)(context, &crypto->key, p, block_sz, 1, 0, ivec);
2380 memset(p, 0, block_sz);
2385 result->length = block_sz;
2388 memset(p, 0, block_sz);
2393 static krb5_error_code
2394 encrypt_internal_special(krb5_context context,
2402 struct encryption_type *et = crypto->et;
2403 size_t cksum_sz = CHECKSUMSIZE(et->checksum);
2404 size_t sz = len + cksum_sz + et->confoundersize;
2406 krb5_error_code ret;
2410 krb5_set_error_string(context, "malloc: out of memory");
2414 memset (p, 0, cksum_sz);
2416 krb5_generate_random_block(p, et->confoundersize);
2417 p += et->confoundersize;
2418 memcpy (p, data, len);
2419 ret = (*et->encrypt)(context, &crypto->key, tmp, sz, TRUE, usage, ivec);
2426 result->length = sz;
2430 static krb5_error_code
2431 decrypt_internal_derived(krb5_context context,
2442 krb5_error_code ret;
2443 struct key_data *dkey;
2444 struct encryption_type *et = crypto->et;
2447 checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
2448 if (len < checksum_sz) {
2449 krb5_clear_error_string (context);
2450 return EINVAL; /* XXX - better error code? */
2454 if(len != 0 && p == NULL) {
2455 krb5_set_error_string(context, "malloc: out of memory");
2458 memcpy(p, data, len);
2462 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
2467 ret = _key_schedule(context, dkey);
2473 krb5_crypto_debug(context, 0, len, dkey->key);
2475 ret = (*et->encrypt)(context, dkey, p, len, 0, usage, ivec);
2481 cksum.checksum.data = p + len;
2482 cksum.checksum.length = checksum_sz;
2483 cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
2485 ret = verify_checksum(context,
2487 INTEGRITY_USAGE(usage),
2495 l = len - et->confoundersize;
2496 memmove(p, p + et->confoundersize, l);
2497 result->data = realloc(p, l);
2498 if(result->data == NULL) {
2500 krb5_set_error_string(context, "malloc: out of memory");
2507 static krb5_error_code
2508 decrypt_internal(krb5_context context,
2515 krb5_error_code ret;
2518 size_t checksum_sz, l;
2519 struct encryption_type *et = crypto->et;
2521 checksum_sz = CHECKSUMSIZE(et->checksum);
2523 if(len != 0 && p == NULL) {
2524 krb5_set_error_string(context, "malloc: out of memory");
2527 memcpy(p, data, len);
2529 ret = _key_schedule(context, &crypto->key);
2535 krb5_crypto_debug(context, 0, len, crypto->key.key);
2537 ret = (*et->encrypt)(context, &crypto->key, p, len, 0, 0, ivec);
2542 ret = krb5_data_copy(&cksum.checksum, p + et->confoundersize, checksum_sz);
2547 memset(p + et->confoundersize, 0, checksum_sz);
2548 cksum.cksumtype = CHECKSUMTYPE(et->checksum);
2549 ret = verify_checksum(context, NULL, 0, p, len, &cksum);
2550 free_Checksum(&cksum);
2555 l = len - et->confoundersize - checksum_sz;
2556 memmove(p, p + et->confoundersize + checksum_sz, l);
2557 result->data = realloc(p, l);
2558 if(result->data == NULL) {
2560 krb5_set_error_string(context, "malloc: out of memory");
2567 static krb5_error_code
2568 decrypt_internal_special(krb5_context context,
2576 struct encryption_type *et = crypto->et;
2577 size_t cksum_sz = CHECKSUMSIZE(et->checksum);
2578 size_t sz = len - cksum_sz - et->confoundersize;
2579 char *cdata = (char *)data;
2581 krb5_error_code ret;
2585 krb5_set_error_string(context, "malloc: out of memory");
2589 ret = (*et->encrypt)(context, &crypto->key, data, len, FALSE, usage, ivec);
2595 memcpy (tmp, cdata + cksum_sz + et->confoundersize, sz);
2598 result->length = sz;
2604 krb5_encrypt_ivec(krb5_context context,
2612 if(derived_crypto(context, crypto))
2613 return encrypt_internal_derived(context, crypto, usage,
2614 data, len, result, ivec);
2615 else if (special_crypto(context, crypto))
2616 return encrypt_internal_special (context, crypto, usage,
2617 data, len, result, ivec);
2619 return encrypt_internal(context, crypto, data, len, result, ivec);
2623 krb5_encrypt(krb5_context context,
2630 return krb5_encrypt_ivec(context, crypto, usage, data, len, result, NULL);
2634 krb5_encrypt_EncryptedData(krb5_context context,
2640 EncryptedData *result)
2642 result->etype = CRYPTO_ETYPE(crypto);
2644 ALLOC(result->kvno, 1);
2645 *result->kvno = kvno;
2647 result->kvno = NULL;
2648 return krb5_encrypt(context, crypto, usage, data, len, &result->cipher);
2652 krb5_decrypt_ivec(krb5_context context,
2660 if(derived_crypto(context, crypto))
2661 return decrypt_internal_derived(context, crypto, usage,
2662 data, len, result, ivec);
2663 else if (special_crypto (context, crypto))
2664 return decrypt_internal_special(context, crypto, usage,
2665 data, len, result, ivec);
2667 return decrypt_internal(context, crypto, data, len, result, ivec);
2671 krb5_decrypt(krb5_context context,
2678 return krb5_decrypt_ivec (context, crypto, usage, data, len, result,
2683 krb5_decrypt_EncryptedData(krb5_context context,
2686 const EncryptedData *e,
2689 return krb5_decrypt(context, crypto, usage,
2690 e->cipher.data, e->cipher.length, result);
2693 /************************************************************
2695 ************************************************************/
2698 #include <openssl/rand.h>
2700 /* From openssl/crypto/rand/rand_lcl.h */
2701 #define ENTROPY_NEEDED 20
2703 seed_something(void)
2706 char buf[1024], seedfile[256];
2708 /* If there is a seed file, load it. But such a file cannot be trusted,
2709 so use 0 for the entropy estimate */
2710 if (RAND_file_name(seedfile, sizeof(seedfile))) {
2711 fd = open(seedfile, O_RDONLY);
2713 read(fd, buf, sizeof(buf));
2714 /* Use the full buffer anyway */
2715 RAND_add(buf, sizeof(buf), 0.0);
2721 /* Calling RAND_status() will try to use /dev/urandom if it exists so
2722 we do not have to deal with it. */
2723 if (RAND_status() != 1) {
2724 krb5_context context;
2728 if (!krb5_init_context(&context)) {
2729 p = krb5_config_get_string(context, NULL, "libdefaults",
2730 "egd_socket", NULL);
2732 RAND_egd_bytes(p, ENTROPY_NEEDED);
2733 krb5_free_context(context);
2737 if (RAND_status() == 1) {
2738 /* Update the seed file */
2740 RAND_write_file(seedfile);
2748 krb5_generate_random_block(void *buf, size_t len)
2750 static int rng_initialized = 0;
2752 if (!rng_initialized) {
2753 if (seed_something())
2754 krb5_abortx(NULL, "Fatal: could not seed the random number generator");
2756 rng_initialized = 1;
2758 RAND_bytes(buf, len);
2764 krb5_generate_random_block(void *buf, size_t len)
2766 des_cblock key, out;
2767 static des_cblock counter;
2768 static des_key_schedule schedule;
2770 static int initialized = 0;
2773 des_new_random_key(&key);
2774 des_set_key(&key, schedule);
2775 memset(&key, 0, sizeof(key));
2776 des_new_random_key(&counter);
2779 des_ecb_encrypt(&counter, &out, schedule, DES_ENCRYPT);
2780 for(i = 7; i >=0; i--)
2783 memcpy(buf, out, min(len, sizeof(out)));
2784 len -= min(len, sizeof(out));
2785 buf = (char*)buf + sizeof(out);
2791 DES3_postproc(krb5_context context,
2792 unsigned char *k, size_t len, struct key_data *key)
2794 unsigned char x[24];
2797 memset(x, 0, sizeof(x));
2798 for (i = 0; i < 3; ++i) {
2801 for (j = 0; j < 7; ++j) {
2802 unsigned char b = k[7 * i + j];
2807 for (j = 6; j >= 0; --j) {
2808 foo |= k[7 * i + j] & 1;
2813 k = key->key->keyvalue.data;
2815 memset(x, 0, sizeof(x));
2816 if (key->schedule) {
2817 krb5_free_data(context, key->schedule);
2818 key->schedule = NULL;
2820 des_set_odd_parity((des_cblock*)k);
2821 des_set_odd_parity((des_cblock*)(k + 8));
2822 des_set_odd_parity((des_cblock*)(k + 16));
2825 static krb5_error_code
2826 derive_key(krb5_context context,
2827 struct encryption_type *et,
2828 struct key_data *key,
2829 const void *constant,
2833 unsigned int nblocks = 0, i;
2834 krb5_error_code ret = 0;
2836 struct key_type *kt = et->keytype;
2837 ret = _key_schedule(context, key);
2840 if(et->blocksize * 8 < kt->bits ||
2841 len != et->blocksize) {
2842 nblocks = (kt->bits + et->blocksize * 8 - 1) / (et->blocksize * 8);
2843 k = malloc(nblocks * et->blocksize);
2845 krb5_set_error_string(context, "malloc: out of memory");
2848 _krb5_n_fold(constant, len, k, et->blocksize);
2849 for(i = 0; i < nblocks; i++) {
2851 memcpy(k + i * et->blocksize,
2852 k + (i - 1) * et->blocksize,
2854 (*et->encrypt)(context, key, k + i * et->blocksize, et->blocksize,
2858 /* this case is probably broken, but won't be run anyway */
2859 void *c = malloc(len);
2860 size_t res_len = (kt->bits + 7) / 8;
2862 if(len != 0 && c == NULL) {
2863 krb5_set_error_string(context, "malloc: out of memory");
2866 memcpy(c, constant, len);
2867 (*et->encrypt)(context, key, c, len, 1, 0, NULL);
2868 k = malloc(res_len);
2869 if(res_len != 0 && k == NULL) {
2871 krb5_set_error_string(context, "malloc: out of memory");
2874 _krb5_n_fold(c, len, k, res_len);
2878 /* XXX keytype dependent post-processing */
2881 DES3_postproc(context, k, nblocks * et->blocksize, key);
2884 krb5_set_error_string(context,
2885 "derive_key() called with unknown keytype (%u)",
2887 ret = KRB5_CRYPTO_INTERNAL;
2890 memset(k, 0, nblocks * et->blocksize);
2895 static struct key_data *
2896 _new_derived_key(krb5_crypto crypto, unsigned usage)
2898 struct key_usage *d = crypto->key_usage;
2899 d = realloc(d, (crypto->num_key_usage + 1) * sizeof(*d));
2902 crypto->key_usage = d;
2903 d += crypto->num_key_usage++;
2904 memset(d, 0, sizeof(*d));
2910 krb5_derive_key(krb5_context context,
2911 const krb5_keyblock *key,
2913 const void *constant,
2914 size_t constant_len,
2915 krb5_keyblock **derived_key)
2917 krb5_error_code ret;
2918 struct encryption_type *et;
2921 et = _find_enctype (etype);
2923 krb5_set_error_string(context, "encryption type %d not supported",
2925 return KRB5_PROG_ETYPE_NOSUPP;
2928 ret = krb5_copy_keyblock(context, key, derived_key);
2932 d.key = *derived_key;
2934 ret = derive_key(context, et, &d, constant, constant_len);
2937 ret = krb5_copy_keyblock(context, d.key, derived_key);
2941 static krb5_error_code
2942 _get_derived_key(krb5_context context,
2945 struct key_data **key)
2949 unsigned char constant[5];
2951 for(i = 0; i < crypto->num_key_usage; i++)
2952 if(crypto->key_usage[i].usage == usage) {
2953 *key = &crypto->key_usage[i].key;
2956 d = _new_derived_key(crypto, usage);
2958 krb5_set_error_string(context, "malloc: out of memory");
2961 krb5_copy_keyblock(context, crypto->key.key, &d->key);
2962 _krb5_put_int(constant, usage, 5);
2963 derive_key(context, crypto->et, d, constant, sizeof(constant));
2970 krb5_crypto_init(krb5_context context,
2971 const krb5_keyblock *key,
2973 krb5_crypto *crypto)
2975 krb5_error_code ret;
2977 if(*crypto == NULL) {
2978 krb5_set_error_string(context, "malloc: out of memory");
2981 if(etype == ETYPE_NULL)
2982 etype = key->keytype;
2983 (*crypto)->et = _find_enctype(etype);
2984 if((*crypto)->et == NULL) {
2986 krb5_set_error_string (context, "encryption type %d not supported",
2988 return KRB5_PROG_ETYPE_NOSUPP;
2990 if((*crypto)->et->keytype->size != key->keyvalue.length) {
2992 krb5_set_error_string (context, "encryption key has bad length");
2993 return KRB5_BAD_KEYSIZE;
2995 ret = krb5_copy_keyblock(context, key, &(*crypto)->key.key);
3000 (*crypto)->key.schedule = NULL;
3001 (*crypto)->num_key_usage = 0;
3002 (*crypto)->key_usage = NULL;
3007 free_key_data(krb5_context context, struct key_data *key)
3009 krb5_free_keyblock(context, key->key);
3011 memset(key->schedule->data, 0, key->schedule->length);
3012 krb5_free_data(context, key->schedule);
3017 free_key_usage(krb5_context context, struct key_usage *ku)
3019 free_key_data(context, &ku->key);
3023 krb5_crypto_destroy(krb5_context context,
3028 for(i = 0; i < crypto->num_key_usage; i++)
3029 free_key_usage(context, &crypto->key_usage[i]);
3030 free(crypto->key_usage);
3031 free_key_data(context, &crypto->key);
3037 krb5_crypto_getblocksize(krb5_context context,
3041 *blocksize = crypto->et->blocksize;
3046 krb5_string_to_key_derived(krb5_context context,
3052 struct encryption_type *et = _find_enctype(etype);
3053 krb5_error_code ret;
3055 size_t keylen = et->keytype->bits / 8;
3059 krb5_set_error_string (context, "encryption type %d not supported",
3061 return KRB5_PROG_ETYPE_NOSUPP;
3064 if(kd.key == NULL) {
3065 krb5_set_error_string (context, "malloc: out of memory");
3068 ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
3073 kd.key->keytype = etype;
3074 tmp = malloc (keylen);
3076 krb5_free_keyblock(context, kd.key);
3077 krb5_set_error_string (context, "malloc: out of memory");
3080 _krb5_n_fold(str, len, tmp, keylen);
3082 DES3_postproc (context, tmp, keylen, &kd); /* XXX */
3083 memset(tmp, 0, keylen);
3085 ret = derive_key(context,
3088 "kerberos", /* XXX well known constant */
3089 strlen("kerberos"));
3090 ret = krb5_copy_keyblock_contents(context, kd.key, key);
3091 free_key_data(context, &kd);
3096 wrapped_length (krb5_context context,
3100 struct encryption_type *et = crypto->et;
3101 size_t blocksize = et->blocksize;
3104 res = et->confoundersize + et->checksum->checksumsize + data_len;
3105 res = (res + blocksize - 1) / blocksize * blocksize;
3110 wrapped_length_dervied (krb5_context context,
3114 struct encryption_type *et = crypto->et;
3115 size_t blocksize = et->blocksize;
3118 res = et->confoundersize + data_len;
3119 res = (res + blocksize - 1) / blocksize * blocksize;
3120 res += et->checksum->checksumsize;
3125 * Return the size of an encrypted packet of length `data_len'
3129 krb5_get_wrapped_length (krb5_context context,
3133 if (derived_crypto (context, crypto))
3134 return wrapped_length_dervied (context, crypto, data_len);
3136 return wrapped_length (context, crypto, data_len);
3141 static krb5_error_code
3142 krb5_get_keyid(krb5_context context,
3147 unsigned char tmp[16];
3150 MD5_Update (&md5, key->keyvalue.data, key->keyvalue.length);
3151 MD5_Final (tmp, &md5);
3152 *keyid = (tmp[12] << 24) | (tmp[13] << 16) | (tmp[14] << 8) | tmp[15];
3157 krb5_crypto_debug(krb5_context context,
3164 krb5_get_keyid(context, key, &keyid);
3165 krb5_enctype_to_string(context, key->keytype, &kt);
3166 krb5_warnx(context, "%s %lu bytes with key-id %#x (%s)",
3167 encrypt ? "encrypting" : "decrypting",
3174 #endif /* CRYPTO_DEBUG */
3182 krb5_context context;
3187 unsigned usage = ENCRYPTION_USAGE(3);
3188 krb5_error_code ret;
3190 ret = krb5_init_context(&context);
3192 errx (1, "krb5_init_context failed: %d", ret);
3194 key.keytype = ETYPE_NEW_DES3_CBC_SHA1;
3195 key.keyvalue.data = "\xb3\x85\x58\x94\xd9\xdc\x7c\xc8"
3196 "\x25\xe9\x85\xab\x3e\xb5\xfb\x0e"
3197 "\xc8\xdf\xab\x26\x86\x64\x15\x25";
3198 key.keyvalue.length = 24;
3200 krb5_crypto_init(context, &key, 0, &crypto);
3202 d = _new_derived_key(crypto, usage);
3205 krb5_copy_keyblock(context, crypto->key.key, &d->key);
3206 _krb5_put_int(constant, usage, 4);
3207 derive_key(context, crypto->et, d, constant, sizeof(constant));
3211 krb5_context context;
3215 krb5_error_code ret;
3218 char *data = "what do ya want for nothing?";
3220 ret = krb5_init_context(&context);
3222 errx (1, "krb5_init_context failed: %d", ret);
3224 key.keytype = ETYPE_NEW_DES3_CBC_SHA1;
3225 key.keyvalue.data = "Jefe";
3226 /* "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"
3227 "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"; */
3228 key.keyvalue.length = 4;
3230 d = calloc(1, sizeof(*d));
3233 res.checksum.length = 20;
3234 res.checksum.data = malloc(res.checksum.length);
3235 HMAC_SHA1_DES3_checksum(context, d, data, 28, &res);