2 * Copyright (c) 1997 - 2005 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 22200 2007-12-07 13:48:01Z lha $");
36 /* RCSID("$FreeBSD$"); */
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 */
70 #define F_DISABLED 64 /* enctype/checksum disabled */
75 krb5_error_code (*string_to_key)(krb5_context, krb5_enctype, krb5_data,
76 krb5_salt, krb5_data, 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;
91 void (*random_to_key)(krb5_context, krb5_keyblock*, const void*, size_t);
94 struct checksum_type {
100 void (*checksum)(krb5_context context,
101 struct key_data *key,
102 const void *buf, size_t len,
105 krb5_error_code (*verify)(krb5_context context,
106 struct key_data *key,
107 const void *buf, size_t len,
112 struct encryption_type {
118 size_t confoundersize;
119 struct key_type *keytype;
120 struct checksum_type *checksum;
121 struct checksum_type *keyed_checksum;
123 krb5_error_code (*encrypt)(krb5_context context,
124 struct key_data *key,
125 void *data, size_t len,
126 krb5_boolean encryptp,
130 krb5_error_code (*prf)(krb5_context,
131 krb5_crypto, const krb5_data *, krb5_data *);
134 #define ENCRYPTION_USAGE(U) (((U) << 8) | 0xAA)
135 #define INTEGRITY_USAGE(U) (((U) << 8) | 0x55)
136 #define CHECKSUM_USAGE(U) (((U) << 8) | 0x99)
138 static struct checksum_type *_find_checksum(krb5_cksumtype type);
139 static struct encryption_type *_find_enctype(krb5_enctype type);
140 static struct key_type *_find_keytype(krb5_keytype type);
141 static krb5_error_code _get_derived_key(krb5_context, krb5_crypto,
142 unsigned, struct key_data**);
143 static struct key_data *_new_derived_key(krb5_crypto crypto, unsigned usage);
144 static krb5_error_code derive_key(krb5_context context,
145 struct encryption_type *et,
146 struct key_data *key,
147 const void *constant,
149 static krb5_error_code hmac(krb5_context context,
150 struct checksum_type *cm,
154 struct key_data *keyblock,
156 static void free_key_data(krb5_context context, struct key_data *key);
157 static krb5_error_code usage2arcfour (krb5_context, unsigned *);
158 static void xor (DES_cblock *, const unsigned char *);
160 /************************************************************
162 ************************************************************/
164 static HEIMDAL_MUTEX crypto_mutex = HEIMDAL_MUTEX_INITIALIZER;
168 krb5_DES_random_key(krb5_context context,
171 DES_cblock *k = key->keyvalue.data;
173 krb5_generate_random_block(k, sizeof(DES_cblock));
174 DES_set_odd_parity(k);
175 } while(DES_is_weak_key(k));
179 krb5_DES_schedule(krb5_context context,
180 struct key_data *key)
182 DES_set_key(key->key->keyvalue.data, key->schedule->data);
185 #ifdef ENABLE_AFS_STRING_TO_KEY
187 /* This defines the Andrew string_to_key function. It accepts a password
188 * string as input and converts it via a one-way encryption algorithm to a DES
189 * encryption key. It is compatible with the original Andrew authentication
190 * service password database.
194 * Short passwords, i.e 8 characters or less.
197 krb5_DES_AFS3_CMU_string_to_key (krb5_data pw,
201 char password[8+1]; /* crypt is limited to 8 chars anyway */
204 for(i = 0; i < 8; i++) {
205 char c = ((i < pw.length) ? ((char*)pw.data)[i] : 0) ^
207 tolower(((unsigned char*)cell.data)[i]) : 0);
208 password[i] = c ? c : 'X';
212 memcpy(key, crypt(password, "p1") + 2, sizeof(DES_cblock));
214 /* parity is inserted into the LSB so left shift each byte up one
215 bit. This allows ascii characters with a zero MSB to retain as
216 much significance as possible. */
217 for (i = 0; i < sizeof(DES_cblock); i++)
218 ((unsigned char*)key)[i] <<= 1;
219 DES_set_odd_parity (key);
223 * Long passwords, i.e 9 characters or more.
226 krb5_DES_AFS3_Transarc_string_to_key (krb5_data pw,
230 DES_key_schedule schedule;
236 memcpy(password, pw.data, min(pw.length, sizeof(password)));
237 if(pw.length < sizeof(password)) {
238 int len = min(cell.length, sizeof(password) - pw.length);
241 memcpy(password + pw.length, cell.data, len);
242 for (i = pw.length; i < pw.length + len; ++i)
243 password[i] = tolower((unsigned char)password[i]);
245 passlen = min(sizeof(password), pw.length + cell.length);
246 memcpy(&ivec, "kerberos", 8);
247 memcpy(&temp_key, "kerberos", 8);
248 DES_set_odd_parity (&temp_key);
249 DES_set_key (&temp_key, &schedule);
250 DES_cbc_cksum ((void*)password, &ivec, passlen, &schedule, &ivec);
252 memcpy(&temp_key, &ivec, 8);
253 DES_set_odd_parity (&temp_key);
254 DES_set_key (&temp_key, &schedule);
255 DES_cbc_cksum ((void*)password, key, passlen, &schedule, &ivec);
256 memset(&schedule, 0, sizeof(schedule));
257 memset(&temp_key, 0, sizeof(temp_key));
258 memset(&ivec, 0, sizeof(ivec));
259 memset(password, 0, sizeof(password));
261 DES_set_odd_parity (key);
264 static krb5_error_code
265 DES_AFS3_string_to_key(krb5_context context,
266 krb5_enctype enctype,
273 if(password.length > 8)
274 krb5_DES_AFS3_Transarc_string_to_key(password, salt.saltvalue, &tmp);
276 krb5_DES_AFS3_CMU_string_to_key(password, salt.saltvalue, &tmp);
277 key->keytype = enctype;
278 krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
279 memset(&key, 0, sizeof(key));
282 #endif /* ENABLE_AFS_STRING_TO_KEY */
285 DES_string_to_key_int(unsigned char *data, size_t length, DES_cblock *key)
287 DES_key_schedule schedule;
292 unsigned char swap[] = { 0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
293 0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf };
296 p = (unsigned char*)key;
297 for (i = 0; i < length; i++) {
298 unsigned char tmp = data[i];
302 *--p ^= (swap[tmp & 0xf] << 4) | swap[(tmp & 0xf0) >> 4];
306 DES_set_odd_parity(key);
307 if(DES_is_weak_key(key))
309 DES_set_key(key, &schedule);
310 DES_cbc_cksum((void*)data, key, length, &schedule, key);
311 memset(&schedule, 0, sizeof(schedule));
312 DES_set_odd_parity(key);
313 if(DES_is_weak_key(key))
317 static krb5_error_code
318 krb5_DES_string_to_key(krb5_context context,
319 krb5_enctype enctype,
329 #ifdef ENABLE_AFS_STRING_TO_KEY
330 if (opaque.length == 1) {
332 _krb5_get_int(opaque.data, &v, 1);
334 return DES_AFS3_string_to_key(context, enctype, password,
339 len = password.length + salt.saltvalue.length;
341 if(len > 0 && s == NULL) {
342 krb5_set_error_string(context, "malloc: out of memory");
345 memcpy(s, password.data, password.length);
346 memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
347 DES_string_to_key_int(s, len, &tmp);
348 key->keytype = enctype;
349 krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
350 memset(&tmp, 0, sizeof(tmp));
357 krb5_DES_random_to_key(krb5_context context,
362 DES_cblock *k = key->keyvalue.data;
363 memcpy(k, data, key->keyvalue.length);
364 DES_set_odd_parity(k);
365 if(DES_is_weak_key(k))
366 xor(k, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
374 DES3_random_key(krb5_context context,
377 DES_cblock *k = key->keyvalue.data;
379 krb5_generate_random_block(k, 3 * sizeof(DES_cblock));
380 DES_set_odd_parity(&k[0]);
381 DES_set_odd_parity(&k[1]);
382 DES_set_odd_parity(&k[2]);
383 } while(DES_is_weak_key(&k[0]) ||
384 DES_is_weak_key(&k[1]) ||
385 DES_is_weak_key(&k[2]));
389 DES3_schedule(krb5_context context,
390 struct key_data *key)
392 DES_cblock *k = key->key->keyvalue.data;
393 DES_key_schedule *s = key->schedule->data;
394 DES_set_key(&k[0], &s[0]);
395 DES_set_key(&k[1], &s[1]);
396 DES_set_key(&k[2], &s[2]);
400 * A = A xor B. A & B are 8 bytes.
404 xor (DES_cblock *key, const unsigned char *b)
406 unsigned char *a = (unsigned char*)key;
417 static krb5_error_code
418 DES3_string_to_key(krb5_context context,
419 krb5_enctype enctype,
427 unsigned char tmp[24];
431 len = password.length + salt.saltvalue.length;
433 if(len != 0 && str == NULL) {
434 krb5_set_error_string(context, "malloc: out of memory");
437 memcpy(str, password.data, password.length);
438 memcpy(str + password.length, salt.saltvalue.data, salt.saltvalue.length);
441 DES_key_schedule s[3];
444 ret = _krb5_n_fold(str, len, tmp, 24);
448 krb5_set_error_string(context, "out of memory");
452 for(i = 0; i < 3; i++){
453 memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
454 DES_set_odd_parity(keys + i);
455 if(DES_is_weak_key(keys + i))
456 xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
457 DES_set_key(keys + i, &s[i]);
459 memset(&ivec, 0, sizeof(ivec));
460 DES_ede3_cbc_encrypt(tmp,
462 &s[0], &s[1], &s[2], &ivec, DES_ENCRYPT);
463 memset(s, 0, sizeof(s));
464 memset(&ivec, 0, sizeof(ivec));
465 for(i = 0; i < 3; i++){
466 memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
467 DES_set_odd_parity(keys + i);
468 if(DES_is_weak_key(keys + i))
469 xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
471 memset(tmp, 0, sizeof(tmp));
473 key->keytype = enctype;
474 krb5_data_copy(&key->keyvalue, keys, sizeof(keys));
475 memset(keys, 0, sizeof(keys));
481 static krb5_error_code
482 DES3_string_to_key_derived(krb5_context context,
483 krb5_enctype enctype,
490 size_t len = password.length + salt.saltvalue.length;
494 if(len != 0 && s == NULL) {
495 krb5_set_error_string(context, "malloc: out of memory");
498 memcpy(s, password.data, password.length);
499 memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
500 ret = krb5_string_to_key_derived(context,
511 DES3_random_to_key(krb5_context context,
516 unsigned char *x = key->keyvalue.data;
517 const u_char *q = data;
521 memset(x, 0, sizeof(x));
522 for (i = 0; i < 3; ++i) {
524 for (j = 0; j < 7; ++j) {
525 unsigned char b = q[7 * i + j];
530 for (j = 6; j >= 0; --j) {
531 foo |= q[7 * i + j] & 1;
536 k = key->keyvalue.data;
537 for (i = 0; i < 3; i++) {
538 DES_set_odd_parity(&k[i]);
539 if(DES_is_weak_key(&k[i]))
540 xor(&k[i], (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
549 ARCFOUR_schedule(krb5_context context,
552 RC4_set_key (kd->schedule->data,
553 kd->key->keyvalue.length, kd->key->keyvalue.data);
556 static krb5_error_code
557 ARCFOUR_string_to_key(krb5_context context,
558 krb5_enctype enctype,
570 len = 2 * password.length;
572 if (len != 0 && s == NULL) {
573 krb5_set_error_string(context, "malloc: out of memory");
577 for (p = s, i = 0; i < password.length; ++i) {
578 *p++ = ((char *)password.data)[i];
582 MD4_Update (&m, s, len);
583 key->keytype = enctype;
584 ret = krb5_data_alloc (&key->keyvalue, 16);
586 krb5_set_error_string(context, "malloc: out of memory");
589 MD4_Final (key->keyvalue.data, &m);
601 int _krb5_AES_string_to_default_iterator = 4096;
603 static krb5_error_code
604 AES_string_to_key(krb5_context context,
605 krb5_enctype enctype,
613 struct encryption_type *et;
616 if (opaque.length == 0)
617 iter = _krb5_AES_string_to_default_iterator;
618 else if (opaque.length == 4) {
620 _krb5_get_int(opaque.data, &v, 4);
621 iter = ((uint32_t)v);
623 return KRB5_PROG_KEYTYPE_NOSUPP; /* XXX */
625 et = _find_enctype(enctype);
627 return KRB5_PROG_KEYTYPE_NOSUPP;
632 krb5_set_error_string (context, "malloc: out of memory");
635 kd.key->keytype = enctype;
636 ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
638 krb5_set_error_string(context, "Failed to allocate pkcs5 key");
642 ret = PKCS5_PBKDF2_HMAC_SHA1(password.data, password.length,
643 salt.saltvalue.data, salt.saltvalue.length,
645 et->keytype->size, kd.key->keyvalue.data);
647 free_key_data(context, &kd);
648 krb5_set_error_string(context, "Error calculating s2k");
649 return KRB5_PROG_KEYTYPE_NOSUPP;
652 ret = derive_key(context, et, &kd, "kerberos", strlen("kerberos"));
654 ret = krb5_copy_keyblock_contents(context, kd.key, key);
655 free_key_data(context, &kd);
660 struct krb5_aes_schedule {
666 AES_schedule(krb5_context context,
669 struct krb5_aes_schedule *key = kd->schedule->data;
670 int bits = kd->key->keyvalue.length * 8;
672 memset(key, 0, sizeof(*key));
673 AES_set_encrypt_key(kd->key->keyvalue.data, bits, &key->ekey);
674 AES_set_decrypt_key(kd->key->keyvalue.data, bits, &key->dkey);
681 static struct salt_type des_salt[] = {
685 krb5_DES_string_to_key
687 #ifdef ENABLE_AFS_STRING_TO_KEY
691 DES_AFS3_string_to_key
697 static struct salt_type des3_salt[] = {
706 static struct salt_type des3_salt_derived[] = {
710 DES3_string_to_key_derived
715 static struct salt_type AES_salt[] = {
724 static struct salt_type arcfour_salt[] = {
728 ARCFOUR_string_to_key
737 static struct key_type keytype_null = {
748 static struct key_type keytype_des = {
753 sizeof(DES_key_schedule),
757 krb5_DES_random_to_key
760 static struct key_type keytype_des3 = {
764 3 * sizeof(DES_cblock),
765 3 * sizeof(DES_key_schedule),
772 static struct key_type keytype_des3_derived = {
776 3 * sizeof(DES_cblock),
777 3 * sizeof(DES_key_schedule),
784 static struct key_type keytype_aes128 = {
789 sizeof(struct krb5_aes_schedule),
795 static struct key_type keytype_aes256 = {
800 sizeof(struct krb5_aes_schedule),
806 static struct key_type keytype_arcfour = {
817 static struct key_type *keytypes[] = {
820 &keytype_des3_derived,
827 static int num_keytypes = sizeof(keytypes) / sizeof(keytypes[0]);
829 static struct key_type *
830 _find_keytype(krb5_keytype type)
833 for(i = 0; i < num_keytypes; i++)
834 if(keytypes[i]->type == type)
840 krb5_error_code KRB5_LIB_FUNCTION
841 krb5_salttype_to_string (krb5_context context,
846 struct encryption_type *e;
847 struct salt_type *st;
849 e = _find_enctype (etype);
851 krb5_set_error_string(context, "encryption type %d not supported",
853 return KRB5_PROG_ETYPE_NOSUPP;
855 for (st = e->keytype->string_to_key; st && st->type; st++) {
856 if (st->type == stype) {
857 *string = strdup (st->name);
858 if (*string == NULL) {
859 krb5_set_error_string(context, "malloc: out of memory");
865 krb5_set_error_string(context, "salttype %d not supported", stype);
866 return HEIM_ERR_SALTTYPE_NOSUPP;
869 krb5_error_code KRB5_LIB_FUNCTION
870 krb5_string_to_salttype (krb5_context context,
873 krb5_salttype *salttype)
875 struct encryption_type *e;
876 struct salt_type *st;
878 e = _find_enctype (etype);
880 krb5_set_error_string(context, "encryption type %d not supported",
882 return KRB5_PROG_ETYPE_NOSUPP;
884 for (st = e->keytype->string_to_key; st && st->type; st++) {
885 if (strcasecmp (st->name, string) == 0) {
886 *salttype = st->type;
890 krb5_set_error_string(context, "salttype %s not supported", string);
891 return HEIM_ERR_SALTTYPE_NOSUPP;
894 krb5_error_code KRB5_LIB_FUNCTION
895 krb5_get_pw_salt(krb5_context context,
896 krb5_const_principal principal,
904 salt->salttype = KRB5_PW_SALT;
905 len = strlen(principal->realm);
906 for (i = 0; i < principal->name.name_string.len; ++i)
907 len += strlen(principal->name.name_string.val[i]);
908 ret = krb5_data_alloc (&salt->saltvalue, len);
911 p = salt->saltvalue.data;
912 memcpy (p, principal->realm, strlen(principal->realm));
913 p += strlen(principal->realm);
914 for (i = 0; i < principal->name.name_string.len; ++i) {
916 principal->name.name_string.val[i],
917 strlen(principal->name.name_string.val[i]));
918 p += strlen(principal->name.name_string.val[i]);
923 krb5_error_code KRB5_LIB_FUNCTION
924 krb5_free_salt(krb5_context context,
927 krb5_data_free(&salt.saltvalue);
931 krb5_error_code KRB5_LIB_FUNCTION
932 krb5_string_to_key_data (krb5_context context,
933 krb5_enctype enctype,
935 krb5_principal principal,
941 ret = krb5_get_pw_salt(context, principal, &salt);
944 ret = krb5_string_to_key_data_salt(context, enctype, password, salt, key);
945 krb5_free_salt(context, salt);
949 krb5_error_code KRB5_LIB_FUNCTION
950 krb5_string_to_key (krb5_context context,
951 krb5_enctype enctype,
952 const char *password,
953 krb5_principal principal,
957 pw.data = rk_UNCONST(password);
958 pw.length = strlen(password);
959 return krb5_string_to_key_data(context, enctype, pw, principal, key);
962 krb5_error_code KRB5_LIB_FUNCTION
963 krb5_string_to_key_data_salt (krb5_context context,
964 krb5_enctype enctype,
970 krb5_data_zero(&opaque);
971 return krb5_string_to_key_data_salt_opaque(context, enctype, password,
976 * Do a string -> key for encryption type `enctype' operation on
977 * `password' (with salt `salt' and the enctype specific data string
978 * `opaque'), returning the resulting key in `key'
981 krb5_error_code KRB5_LIB_FUNCTION
982 krb5_string_to_key_data_salt_opaque (krb5_context context,
983 krb5_enctype enctype,
989 struct encryption_type *et =_find_enctype(enctype);
990 struct salt_type *st;
992 krb5_set_error_string(context, "encryption type %d not supported",
994 return KRB5_PROG_ETYPE_NOSUPP;
996 for(st = et->keytype->string_to_key; st && st->type; st++)
997 if(st->type == salt.salttype)
998 return (*st->string_to_key)(context, enctype, password,
1000 krb5_set_error_string(context, "salt type %d not supported",
1002 return HEIM_ERR_SALTTYPE_NOSUPP;
1006 * Do a string -> key for encryption type `enctype' operation on the
1007 * string `password' (with salt `salt'), returning the resulting key
1011 krb5_error_code KRB5_LIB_FUNCTION
1012 krb5_string_to_key_salt (krb5_context context,
1013 krb5_enctype enctype,
1014 const char *password,
1019 pw.data = rk_UNCONST(password);
1020 pw.length = strlen(password);
1021 return krb5_string_to_key_data_salt(context, enctype, pw, salt, key);
1024 krb5_error_code KRB5_LIB_FUNCTION
1025 krb5_string_to_key_salt_opaque (krb5_context context,
1026 krb5_enctype enctype,
1027 const char *password,
1033 pw.data = rk_UNCONST(password);
1034 pw.length = strlen(password);
1035 return krb5_string_to_key_data_salt_opaque(context, enctype,
1036 pw, salt, opaque, key);
1039 krb5_error_code KRB5_LIB_FUNCTION
1040 krb5_keytype_to_string(krb5_context context,
1041 krb5_keytype keytype,
1044 struct key_type *kt = _find_keytype(keytype);
1046 krb5_set_error_string(context, "key type %d not supported", keytype);
1047 return KRB5_PROG_KEYTYPE_NOSUPP;
1049 *string = strdup(kt->name);
1050 if(*string == NULL) {
1051 krb5_set_error_string(context, "malloc: out of memory");
1057 krb5_error_code KRB5_LIB_FUNCTION
1058 krb5_string_to_keytype(krb5_context context,
1060 krb5_keytype *keytype)
1063 for(i = 0; i < num_keytypes; i++)
1064 if(strcasecmp(keytypes[i]->name, string) == 0){
1065 *keytype = keytypes[i]->type;
1068 krb5_set_error_string(context, "key type %s not supported", string);
1069 return KRB5_PROG_KEYTYPE_NOSUPP;
1072 krb5_error_code KRB5_LIB_FUNCTION
1073 krb5_enctype_keysize(krb5_context context,
1077 struct encryption_type *et = _find_enctype(type);
1079 krb5_set_error_string(context, "encryption type %d not supported",
1081 return KRB5_PROG_ETYPE_NOSUPP;
1083 *keysize = et->keytype->size;
1087 krb5_error_code KRB5_LIB_FUNCTION
1088 krb5_enctype_keybits(krb5_context context,
1092 struct encryption_type *et = _find_enctype(type);
1094 krb5_set_error_string(context, "encryption type %d not supported",
1096 return KRB5_PROG_ETYPE_NOSUPP;
1098 *keybits = et->keytype->bits;
1102 krb5_error_code KRB5_LIB_FUNCTION
1103 krb5_generate_random_keyblock(krb5_context context,
1107 krb5_error_code ret;
1108 struct encryption_type *et = _find_enctype(type);
1110 krb5_set_error_string(context, "encryption type %d not supported",
1112 return KRB5_PROG_ETYPE_NOSUPP;
1114 ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
1117 key->keytype = type;
1118 if(et->keytype->random_key)
1119 (*et->keytype->random_key)(context, key);
1121 krb5_generate_random_block(key->keyvalue.data,
1122 key->keyvalue.length);
1126 static krb5_error_code
1127 _key_schedule(krb5_context context,
1128 struct key_data *key)
1130 krb5_error_code ret;
1131 struct encryption_type *et = _find_enctype(key->key->keytype);
1132 struct key_type *kt = et->keytype;
1134 if(kt->schedule == NULL)
1136 if (key->schedule != NULL)
1138 ALLOC(key->schedule, 1);
1139 if(key->schedule == NULL) {
1140 krb5_set_error_string(context, "malloc: out of memory");
1143 ret = krb5_data_alloc(key->schedule, kt->schedule_size);
1145 free(key->schedule);
1146 key->schedule = NULL;
1149 (*kt->schedule)(context, key);
1153 /************************************************************
1155 ************************************************************/
1158 NONE_checksum(krb5_context context,
1159 struct key_data *key,
1168 CRC32_checksum(krb5_context context,
1169 struct key_data *key,
1176 unsigned char *r = C->checksum.data;
1177 _krb5_crc_init_table ();
1178 crc = _krb5_crc_update (data, len, 0);
1180 r[1] = (crc >> 8) & 0xff;
1181 r[2] = (crc >> 16) & 0xff;
1182 r[3] = (crc >> 24) & 0xff;
1186 RSA_MD4_checksum(krb5_context context,
1187 struct key_data *key,
1196 MD4_Update (&m, data, len);
1197 MD4_Final (C->checksum.data, &m);
1201 RSA_MD4_DES_checksum(krb5_context context,
1202 struct key_data *key,
1210 unsigned char *p = cksum->checksum.data;
1212 krb5_generate_random_block(p, 8);
1214 MD4_Update (&md4, p, 8);
1215 MD4_Update (&md4, data, len);
1216 MD4_Final (p + 8, &md4);
1217 memset (&ivec, 0, sizeof(ivec));
1221 key->schedule->data,
1226 static krb5_error_code
1227 RSA_MD4_DES_verify(krb5_context context,
1228 struct key_data *key,
1235 unsigned char tmp[24];
1236 unsigned char res[16];
1238 krb5_error_code ret = 0;
1240 memset(&ivec, 0, sizeof(ivec));
1241 DES_cbc_encrypt(C->checksum.data,
1244 key->schedule->data,
1248 MD4_Update (&md4, tmp, 8); /* confounder */
1249 MD4_Update (&md4, data, len);
1250 MD4_Final (res, &md4);
1251 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1252 krb5_clear_error_string (context);
1253 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1255 memset(tmp, 0, sizeof(tmp));
1256 memset(res, 0, sizeof(res));
1261 RSA_MD5_checksum(krb5_context context,
1262 struct key_data *key,
1271 MD5_Update(&m, data, len);
1272 MD5_Final (C->checksum.data, &m);
1276 RSA_MD5_DES_checksum(krb5_context context,
1277 struct key_data *key,
1285 unsigned char *p = C->checksum.data;
1287 krb5_generate_random_block(p, 8);
1289 MD5_Update (&md5, p, 8);
1290 MD5_Update (&md5, data, len);
1291 MD5_Final (p + 8, &md5);
1292 memset (&ivec, 0, sizeof(ivec));
1296 key->schedule->data,
1301 static krb5_error_code
1302 RSA_MD5_DES_verify(krb5_context context,
1303 struct key_data *key,
1310 unsigned char tmp[24];
1311 unsigned char res[16];
1313 DES_key_schedule *sched = key->schedule->data;
1314 krb5_error_code ret = 0;
1316 memset(&ivec, 0, sizeof(ivec));
1317 DES_cbc_encrypt(C->checksum.data,
1324 MD5_Update (&md5, tmp, 8); /* confounder */
1325 MD5_Update (&md5, data, len);
1326 MD5_Final (res, &md5);
1327 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1328 krb5_clear_error_string (context);
1329 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1331 memset(tmp, 0, sizeof(tmp));
1332 memset(res, 0, sizeof(res));
1337 RSA_MD5_DES3_checksum(krb5_context context,
1338 struct key_data *key,
1346 unsigned char *p = C->checksum.data;
1347 DES_key_schedule *sched = key->schedule->data;
1349 krb5_generate_random_block(p, 8);
1351 MD5_Update (&md5, p, 8);
1352 MD5_Update (&md5, data, len);
1353 MD5_Final (p + 8, &md5);
1354 memset (&ivec, 0, sizeof(ivec));
1355 DES_ede3_cbc_encrypt(p,
1358 &sched[0], &sched[1], &sched[2],
1363 static krb5_error_code
1364 RSA_MD5_DES3_verify(krb5_context context,
1365 struct key_data *key,
1372 unsigned char tmp[24];
1373 unsigned char res[16];
1375 DES_key_schedule *sched = key->schedule->data;
1376 krb5_error_code ret = 0;
1378 memset(&ivec, 0, sizeof(ivec));
1379 DES_ede3_cbc_encrypt(C->checksum.data,
1382 &sched[0], &sched[1], &sched[2],
1386 MD5_Update (&md5, tmp, 8); /* confounder */
1387 MD5_Update (&md5, data, len);
1388 MD5_Final (res, &md5);
1389 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1390 krb5_clear_error_string (context);
1391 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1393 memset(tmp, 0, sizeof(tmp));
1394 memset(res, 0, sizeof(res));
1399 SHA1_checksum(krb5_context context,
1400 struct key_data *key,
1409 SHA1_Update(&m, data, len);
1410 SHA1_Final(C->checksum.data, &m);
1413 /* HMAC according to RFC2104 */
1414 static krb5_error_code
1415 hmac(krb5_context context,
1416 struct checksum_type *cm,
1420 struct key_data *keyblock,
1423 unsigned char *ipad, *opad;
1428 ipad = malloc(cm->blocksize + len);
1431 opad = malloc(cm->blocksize + cm->checksumsize);
1436 memset(ipad, 0x36, cm->blocksize);
1437 memset(opad, 0x5c, cm->blocksize);
1439 if(keyblock->key->keyvalue.length > cm->blocksize){
1440 (*cm->checksum)(context,
1442 keyblock->key->keyvalue.data,
1443 keyblock->key->keyvalue.length,
1446 key = result->checksum.data;
1447 key_len = result->checksum.length;
1449 key = keyblock->key->keyvalue.data;
1450 key_len = keyblock->key->keyvalue.length;
1452 for(i = 0; i < key_len; i++){
1456 memcpy(ipad + cm->blocksize, data, len);
1457 (*cm->checksum)(context, keyblock, ipad, cm->blocksize + len,
1459 memcpy(opad + cm->blocksize, result->checksum.data,
1460 result->checksum.length);
1461 (*cm->checksum)(context, keyblock, opad,
1462 cm->blocksize + cm->checksumsize, usage, result);
1463 memset(ipad, 0, cm->blocksize + len);
1465 memset(opad, 0, cm->blocksize + cm->checksumsize);
1471 krb5_error_code KRB5_LIB_FUNCTION
1472 krb5_hmac(krb5_context context,
1473 krb5_cksumtype cktype,
1480 struct checksum_type *c = _find_checksum(cktype);
1482 krb5_error_code ret;
1485 krb5_set_error_string (context, "checksum type %d not supported",
1487 return KRB5_PROG_SUMTYPE_NOSUPP;
1493 ret = hmac(context, c, data, len, usage, &kd, result);
1496 krb5_free_data(context, kd.schedule);
1502 SP_HMAC_SHA1_checksum(krb5_context context,
1503 struct key_data *key,
1509 struct checksum_type *c = _find_checksum(CKSUMTYPE_SHA1);
1512 krb5_error_code ret;
1514 res.checksum.data = sha1_data;
1515 res.checksum.length = sizeof(sha1_data);
1517 ret = hmac(context, c, data, len, usage, key, &res);
1519 krb5_abortx(context, "hmac failed");
1520 memcpy(result->checksum.data, res.checksum.data, result->checksum.length);
1524 * checksum according to section 5. of draft-brezak-win2k-krb-rc4-hmac-03.txt
1528 HMAC_MD5_checksum(krb5_context context,
1529 struct key_data *key,
1536 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
1537 const char signature[] = "signaturekey";
1539 struct key_data ksign;
1542 unsigned char tmp[16];
1543 unsigned char ksign_c_data[16];
1544 krb5_error_code ret;
1546 ksign_c.checksum.length = sizeof(ksign_c_data);
1547 ksign_c.checksum.data = ksign_c_data;
1548 ret = hmac(context, c, signature, sizeof(signature), 0, key, &ksign_c);
1550 krb5_abortx(context, "hmac failed");
1552 kb.keyvalue = ksign_c.checksum;
1554 t[0] = (usage >> 0) & 0xFF;
1555 t[1] = (usage >> 8) & 0xFF;
1556 t[2] = (usage >> 16) & 0xFF;
1557 t[3] = (usage >> 24) & 0xFF;
1558 MD5_Update (&md5, t, 4);
1559 MD5_Update (&md5, data, len);
1560 MD5_Final (tmp, &md5);
1561 ret = hmac(context, c, tmp, sizeof(tmp), 0, &ksign, result);
1563 krb5_abortx(context, "hmac failed");
1567 * same as previous but being used while encrypting.
1571 HMAC_MD5_checksum_enc(krb5_context context,
1572 struct key_data *key,
1578 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
1580 struct key_data ksign;
1583 unsigned char ksign_c_data[16];
1584 krb5_error_code ret;
1586 t[0] = (usage >> 0) & 0xFF;
1587 t[1] = (usage >> 8) & 0xFF;
1588 t[2] = (usage >> 16) & 0xFF;
1589 t[3] = (usage >> 24) & 0xFF;
1591 ksign_c.checksum.length = sizeof(ksign_c_data);
1592 ksign_c.checksum.data = ksign_c_data;
1593 ret = hmac(context, c, t, sizeof(t), 0, key, &ksign_c);
1595 krb5_abortx(context, "hmac failed");
1597 kb.keyvalue = ksign_c.checksum;
1598 ret = hmac(context, c, data, len, 0, &ksign, result);
1600 krb5_abortx(context, "hmac failed");
1603 static struct checksum_type checksum_none = {
1612 static struct checksum_type checksum_crc32 = {
1621 static struct checksum_type checksum_rsa_md4 = {
1630 static struct checksum_type checksum_rsa_md4_des = {
1631 CKSUMTYPE_RSA_MD4_DES,
1635 F_KEYED | F_CPROOF | F_VARIANT,
1636 RSA_MD4_DES_checksum,
1640 static struct checksum_type checksum_des_mac = {
1648 static struct checksum_type checksum_des_mac_k = {
1649 CKSUMTYPE_DES_MAC_K,
1656 static struct checksum_type checksum_rsa_md4_des_k = {
1657 CKSUMTYPE_RSA_MD4_DES_K,
1662 RSA_MD4_DES_K_checksum,
1663 RSA_MD4_DES_K_verify
1666 static struct checksum_type checksum_rsa_md5 = {
1675 static struct checksum_type checksum_rsa_md5_des = {
1676 CKSUMTYPE_RSA_MD5_DES,
1680 F_KEYED | F_CPROOF | F_VARIANT,
1681 RSA_MD5_DES_checksum,
1684 static struct checksum_type checksum_rsa_md5_des3 = {
1685 CKSUMTYPE_RSA_MD5_DES3,
1689 F_KEYED | F_CPROOF | F_VARIANT,
1690 RSA_MD5_DES3_checksum,
1693 static struct checksum_type checksum_sha1 = {
1702 static struct checksum_type checksum_hmac_sha1_des3 = {
1703 CKSUMTYPE_HMAC_SHA1_DES3,
1707 F_KEYED | F_CPROOF | F_DERIVED,
1708 SP_HMAC_SHA1_checksum,
1712 static struct checksum_type checksum_hmac_sha1_aes128 = {
1713 CKSUMTYPE_HMAC_SHA1_96_AES_128,
1714 "hmac-sha1-96-aes128",
1717 F_KEYED | F_CPROOF | F_DERIVED,
1718 SP_HMAC_SHA1_checksum,
1722 static struct checksum_type checksum_hmac_sha1_aes256 = {
1723 CKSUMTYPE_HMAC_SHA1_96_AES_256,
1724 "hmac-sha1-96-aes256",
1727 F_KEYED | F_CPROOF | F_DERIVED,
1728 SP_HMAC_SHA1_checksum,
1732 static struct checksum_type checksum_hmac_md5 = {
1742 static struct checksum_type checksum_hmac_md5_enc = {
1743 CKSUMTYPE_HMAC_MD5_ENC,
1747 F_KEYED | F_CPROOF | F_PSEUDO,
1748 HMAC_MD5_checksum_enc,
1752 static struct checksum_type *checksum_types[] = {
1756 &checksum_rsa_md4_des,
1759 &checksum_des_mac_k,
1760 &checksum_rsa_md4_des_k,
1763 &checksum_rsa_md5_des,
1764 &checksum_rsa_md5_des3,
1766 &checksum_hmac_sha1_des3,
1767 &checksum_hmac_sha1_aes128,
1768 &checksum_hmac_sha1_aes256,
1770 &checksum_hmac_md5_enc
1773 static int num_checksums = sizeof(checksum_types) / sizeof(checksum_types[0]);
1775 static struct checksum_type *
1776 _find_checksum(krb5_cksumtype type)
1779 for(i = 0; i < num_checksums; i++)
1780 if(checksum_types[i]->type == type)
1781 return checksum_types[i];
1785 static krb5_error_code
1786 get_checksum_key(krb5_context context,
1788 unsigned usage, /* not krb5_key_usage */
1789 struct checksum_type *ct,
1790 struct key_data **key)
1792 krb5_error_code ret = 0;
1794 if(ct->flags & F_DERIVED)
1795 ret = _get_derived_key(context, crypto, usage, key);
1796 else if(ct->flags & F_VARIANT) {
1799 *key = _new_derived_key(crypto, 0xff/* KRB5_KU_RFC1510_VARIANT */);
1801 krb5_set_error_string(context, "malloc: out of memory");
1804 ret = krb5_copy_keyblock(context, crypto->key.key, &(*key)->key);
1807 for(i = 0; i < (*key)->key->keyvalue.length; i++)
1808 ((unsigned char*)(*key)->key->keyvalue.data)[i] ^= 0xF0;
1810 *key = &crypto->key;
1813 ret = _key_schedule(context, *key);
1817 static krb5_error_code
1818 create_checksum (krb5_context context,
1819 struct checksum_type *ct,
1826 krb5_error_code ret;
1827 struct key_data *dkey;
1830 if (ct->flags & F_DISABLED) {
1831 krb5_clear_error_string (context);
1832 return KRB5_PROG_SUMTYPE_NOSUPP;
1834 keyed_checksum = (ct->flags & F_KEYED) != 0;
1835 if(keyed_checksum && crypto == NULL) {
1836 krb5_set_error_string (context, "Checksum type %s is keyed "
1837 "but no crypto context (key) was passed in",
1839 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
1841 if(keyed_checksum) {
1842 ret = get_checksum_key(context, crypto, usage, ct, &dkey);
1847 result->cksumtype = ct->type;
1848 ret = krb5_data_alloc(&result->checksum, ct->checksumsize);
1851 (*ct->checksum)(context, dkey, data, len, usage, result);
1856 arcfour_checksum_p(struct checksum_type *ct, krb5_crypto crypto)
1858 return (ct->type == CKSUMTYPE_HMAC_MD5) &&
1859 (crypto->key.key->keytype == KEYTYPE_ARCFOUR);
1862 krb5_error_code KRB5_LIB_FUNCTION
1863 krb5_create_checksum(krb5_context context,
1865 krb5_key_usage usage,
1871 struct checksum_type *ct = NULL;
1874 /* type 0 -> pick from crypto */
1876 ct = _find_checksum(type);
1877 } else if (crypto) {
1878 ct = crypto->et->keyed_checksum;
1880 ct = crypto->et->checksum;
1884 krb5_set_error_string (context, "checksum type %d not supported",
1886 return KRB5_PROG_SUMTYPE_NOSUPP;
1889 if (arcfour_checksum_p(ct, crypto)) {
1891 usage2arcfour(context, &keyusage);
1893 keyusage = CHECKSUM_USAGE(usage);
1895 return create_checksum(context, ct, crypto, keyusage,
1899 static krb5_error_code
1900 verify_checksum(krb5_context context,
1902 unsigned usage, /* not krb5_key_usage */
1907 krb5_error_code ret;
1908 struct key_data *dkey;
1911 struct checksum_type *ct;
1913 ct = _find_checksum(cksum->cksumtype);
1914 if (ct == NULL || (ct->flags & F_DISABLED)) {
1915 krb5_set_error_string (context, "checksum type %d not supported",
1917 return KRB5_PROG_SUMTYPE_NOSUPP;
1919 if(ct->checksumsize != cksum->checksum.length) {
1920 krb5_clear_error_string (context);
1921 return KRB5KRB_AP_ERR_BAD_INTEGRITY; /* XXX */
1923 keyed_checksum = (ct->flags & F_KEYED) != 0;
1924 if(keyed_checksum && crypto == NULL) {
1925 krb5_set_error_string (context, "Checksum type %s is keyed "
1926 "but no crypto context (key) was passed in",
1928 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
1931 ret = get_checksum_key(context, crypto, usage, ct, &dkey);
1935 return (*ct->verify)(context, dkey, data, len, usage, cksum);
1937 ret = krb5_data_alloc (&c.checksum, ct->checksumsize);
1941 (*ct->checksum)(context, dkey, data, len, usage, &c);
1943 if(c.checksum.length != cksum->checksum.length ||
1944 memcmp(c.checksum.data, cksum->checksum.data, c.checksum.length)) {
1945 krb5_clear_error_string (context);
1946 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1950 krb5_data_free (&c.checksum);
1954 krb5_error_code KRB5_LIB_FUNCTION
1955 krb5_verify_checksum(krb5_context context,
1957 krb5_key_usage usage,
1962 struct checksum_type *ct;
1965 ct = _find_checksum(cksum->cksumtype);
1967 krb5_set_error_string (context, "checksum type %d not supported",
1969 return KRB5_PROG_SUMTYPE_NOSUPP;
1972 if (arcfour_checksum_p(ct, crypto)) {
1974 usage2arcfour(context, &keyusage);
1976 keyusage = CHECKSUM_USAGE(usage);
1978 return verify_checksum(context, crypto, keyusage,
1982 krb5_error_code KRB5_LIB_FUNCTION
1983 krb5_crypto_get_checksum_type(krb5_context context,
1985 krb5_cksumtype *type)
1987 struct checksum_type *ct = NULL;
1989 if (crypto != NULL) {
1990 ct = crypto->et->keyed_checksum;
1992 ct = crypto->et->checksum;
1996 krb5_set_error_string (context, "checksum type not found");
1997 return KRB5_PROG_SUMTYPE_NOSUPP;
2006 krb5_error_code KRB5_LIB_FUNCTION
2007 krb5_checksumsize(krb5_context context,
2008 krb5_cksumtype type,
2011 struct checksum_type *ct = _find_checksum(type);
2013 krb5_set_error_string (context, "checksum type %d not supported",
2015 return KRB5_PROG_SUMTYPE_NOSUPP;
2017 *size = ct->checksumsize;
2021 krb5_boolean KRB5_LIB_FUNCTION
2022 krb5_checksum_is_keyed(krb5_context context,
2023 krb5_cksumtype type)
2025 struct checksum_type *ct = _find_checksum(type);
2028 krb5_set_error_string (context, "checksum type %d not supported",
2030 return KRB5_PROG_SUMTYPE_NOSUPP;
2032 return ct->flags & F_KEYED;
2035 krb5_boolean KRB5_LIB_FUNCTION
2036 krb5_checksum_is_collision_proof(krb5_context context,
2037 krb5_cksumtype type)
2039 struct checksum_type *ct = _find_checksum(type);
2042 krb5_set_error_string (context, "checksum type %d not supported",
2044 return KRB5_PROG_SUMTYPE_NOSUPP;
2046 return ct->flags & F_CPROOF;
2049 krb5_error_code KRB5_LIB_FUNCTION
2050 krb5_checksum_disable(krb5_context context,
2051 krb5_cksumtype type)
2053 struct checksum_type *ct = _find_checksum(type);
2056 krb5_set_error_string (context, "checksum type %d not supported",
2058 return KRB5_PROG_SUMTYPE_NOSUPP;
2060 ct->flags |= F_DISABLED;
2064 /************************************************************
2066 ************************************************************/
2068 static krb5_error_code
2069 NULL_encrypt(krb5_context context,
2070 struct key_data *key,
2073 krb5_boolean encryptp,
2080 static krb5_error_code
2081 DES_CBC_encrypt_null_ivec(krb5_context context,
2082 struct key_data *key,
2085 krb5_boolean encryptp,
2090 DES_key_schedule *s = key->schedule->data;
2091 memset(&ivec, 0, sizeof(ivec));
2092 DES_cbc_encrypt(data, data, len, s, &ivec, encryptp);
2096 static krb5_error_code
2097 DES_CBC_encrypt_key_ivec(krb5_context context,
2098 struct key_data *key,
2101 krb5_boolean encryptp,
2106 DES_key_schedule *s = key->schedule->data;
2107 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
2108 DES_cbc_encrypt(data, data, len, s, &ivec, encryptp);
2112 static krb5_error_code
2113 DES3_CBC_encrypt(krb5_context context,
2114 struct key_data *key,
2117 krb5_boolean encryptp,
2121 DES_cblock local_ivec;
2122 DES_key_schedule *s = key->schedule->data;
2125 memset(local_ivec, 0, sizeof(local_ivec));
2127 DES_ede3_cbc_encrypt(data, data, len, &s[0], &s[1], &s[2], ivec, encryptp);
2131 static krb5_error_code
2132 DES_CFB64_encrypt_null_ivec(krb5_context context,
2133 struct key_data *key,
2136 krb5_boolean encryptp,
2142 DES_key_schedule *s = key->schedule->data;
2143 memset(&ivec, 0, sizeof(ivec));
2145 DES_cfb64_encrypt(data, data, len, s, &ivec, &num, encryptp);
2149 static krb5_error_code
2150 DES_PCBC_encrypt_key_ivec(krb5_context context,
2151 struct key_data *key,
2154 krb5_boolean encryptp,
2159 DES_key_schedule *s = key->schedule->data;
2160 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
2162 DES_pcbc_encrypt(data, data, len, s, &ivec, encryptp);
2167 * AES draft-raeburn-krb-rijndael-krb-02
2170 void KRB5_LIB_FUNCTION
2171 _krb5_aes_cts_encrypt(const unsigned char *in, unsigned char *out,
2172 size_t len, const AES_KEY *key,
2173 unsigned char *ivec, const int encryptp)
2175 unsigned char tmp[AES_BLOCK_SIZE];
2179 * In the framework of kerberos, the length can never be shorter
2180 * then at least one blocksize.
2185 while(len > AES_BLOCK_SIZE) {
2186 for (i = 0; i < AES_BLOCK_SIZE; i++)
2187 tmp[i] = in[i] ^ ivec[i];
2188 AES_encrypt(tmp, out, key);
2189 memcpy(ivec, out, AES_BLOCK_SIZE);
2190 len -= AES_BLOCK_SIZE;
2191 in += AES_BLOCK_SIZE;
2192 out += AES_BLOCK_SIZE;
2195 for (i = 0; i < len; i++)
2196 tmp[i] = in[i] ^ ivec[i];
2197 for (; i < AES_BLOCK_SIZE; i++)
2198 tmp[i] = 0 ^ ivec[i];
2200 AES_encrypt(tmp, out - AES_BLOCK_SIZE, key);
2202 memcpy(out, ivec, len);
2203 memcpy(ivec, out - AES_BLOCK_SIZE, AES_BLOCK_SIZE);
2206 unsigned char tmp2[AES_BLOCK_SIZE];
2207 unsigned char tmp3[AES_BLOCK_SIZE];
2209 while(len > AES_BLOCK_SIZE * 2) {
2210 memcpy(tmp, in, AES_BLOCK_SIZE);
2211 AES_decrypt(in, out, key);
2212 for (i = 0; i < AES_BLOCK_SIZE; i++)
2214 memcpy(ivec, tmp, AES_BLOCK_SIZE);
2215 len -= AES_BLOCK_SIZE;
2216 in += AES_BLOCK_SIZE;
2217 out += AES_BLOCK_SIZE;
2220 len -= AES_BLOCK_SIZE;
2222 memcpy(tmp, in, AES_BLOCK_SIZE); /* save last iv */
2223 AES_decrypt(in, tmp2, key);
2225 memcpy(tmp3, in + AES_BLOCK_SIZE, len);
2226 memcpy(tmp3 + len, tmp2 + len, AES_BLOCK_SIZE - len); /* xor 0 */
2228 for (i = 0; i < len; i++)
2229 out[i + AES_BLOCK_SIZE] = tmp2[i] ^ tmp3[i];
2231 AES_decrypt(tmp3, out, key);
2232 for (i = 0; i < AES_BLOCK_SIZE; i++)
2234 memcpy(ivec, tmp, AES_BLOCK_SIZE);
2238 static krb5_error_code
2239 AES_CTS_encrypt(krb5_context context,
2240 struct key_data *key,
2243 krb5_boolean encryptp,
2247 struct krb5_aes_schedule *aeskey = key->schedule->data;
2248 char local_ivec[AES_BLOCK_SIZE];
2256 if (len < AES_BLOCK_SIZE)
2257 krb5_abortx(context, "invalid use of AES_CTS_encrypt");
2258 if (len == AES_BLOCK_SIZE) {
2260 AES_encrypt(data, data, k);
2262 AES_decrypt(data, data, k);
2265 memset(local_ivec, 0, sizeof(local_ivec));
2268 _krb5_aes_cts_encrypt(data, data, len, k, ivec, encryptp);
2275 * section 6 of draft-brezak-win2k-krb-rc4-hmac-03
2277 * warning: not for small children
2280 static krb5_error_code
2281 ARCFOUR_subencrypt(krb5_context context,
2282 struct key_data *key,
2288 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
2289 Checksum k1_c, k2_c, k3_c, cksum;
2294 unsigned char *cdata = data;
2295 unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
2296 krb5_error_code ret;
2298 t[0] = (usage >> 0) & 0xFF;
2299 t[1] = (usage >> 8) & 0xFF;
2300 t[2] = (usage >> 16) & 0xFF;
2301 t[3] = (usage >> 24) & 0xFF;
2303 k1_c.checksum.length = sizeof(k1_c_data);
2304 k1_c.checksum.data = k1_c_data;
2306 ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
2308 krb5_abortx(context, "hmac failed");
2310 memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
2312 k2_c.checksum.length = sizeof(k2_c_data);
2313 k2_c.checksum.data = k2_c_data;
2316 kb.keyvalue = k2_c.checksum;
2318 cksum.checksum.length = 16;
2319 cksum.checksum.data = data;
2321 ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
2323 krb5_abortx(context, "hmac failed");
2326 kb.keyvalue = k1_c.checksum;
2328 k3_c.checksum.length = sizeof(k3_c_data);
2329 k3_c.checksum.data = k3_c_data;
2331 ret = hmac(NULL, c, data, 16, 0, &ke, &k3_c);
2333 krb5_abortx(context, "hmac failed");
2335 RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data);
2336 RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16);
2337 memset (k1_c_data, 0, sizeof(k1_c_data));
2338 memset (k2_c_data, 0, sizeof(k2_c_data));
2339 memset (k3_c_data, 0, sizeof(k3_c_data));
2343 static krb5_error_code
2344 ARCFOUR_subdecrypt(krb5_context context,
2345 struct key_data *key,
2351 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
2352 Checksum k1_c, k2_c, k3_c, cksum;
2357 unsigned char *cdata = data;
2358 unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
2359 unsigned char cksum_data[16];
2360 krb5_error_code ret;
2362 t[0] = (usage >> 0) & 0xFF;
2363 t[1] = (usage >> 8) & 0xFF;
2364 t[2] = (usage >> 16) & 0xFF;
2365 t[3] = (usage >> 24) & 0xFF;
2367 k1_c.checksum.length = sizeof(k1_c_data);
2368 k1_c.checksum.data = k1_c_data;
2370 ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
2372 krb5_abortx(context, "hmac failed");
2374 memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
2376 k2_c.checksum.length = sizeof(k2_c_data);
2377 k2_c.checksum.data = k2_c_data;
2380 kb.keyvalue = k1_c.checksum;
2382 k3_c.checksum.length = sizeof(k3_c_data);
2383 k3_c.checksum.data = k3_c_data;
2385 ret = hmac(NULL, c, cdata, 16, 0, &ke, &k3_c);
2387 krb5_abortx(context, "hmac failed");
2389 RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data);
2390 RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16);
2393 kb.keyvalue = k2_c.checksum;
2395 cksum.checksum.length = 16;
2396 cksum.checksum.data = cksum_data;
2398 ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
2400 krb5_abortx(context, "hmac failed");
2402 memset (k1_c_data, 0, sizeof(k1_c_data));
2403 memset (k2_c_data, 0, sizeof(k2_c_data));
2404 memset (k3_c_data, 0, sizeof(k3_c_data));
2406 if (memcmp (cksum.checksum.data, data, 16) != 0) {
2407 krb5_clear_error_string (context);
2408 return KRB5KRB_AP_ERR_BAD_INTEGRITY;
2415 * convert the usage numbers used in
2416 * draft-ietf-cat-kerb-key-derivation-00.txt to the ones in
2417 * draft-brezak-win2k-krb-rc4-hmac-04.txt
2420 static krb5_error_code
2421 usage2arcfour (krb5_context context, unsigned *usage)
2424 case KRB5_KU_AS_REP_ENC_PART : /* 3 */
2425 case KRB5_KU_TGS_REP_ENC_PART_SUB_KEY : /* 9 */
2428 case KRB5_KU_USAGE_SEAL : /* 22 */
2431 case KRB5_KU_USAGE_SIGN : /* 23 */
2434 case KRB5_KU_USAGE_SEQ: /* 24 */
2442 static krb5_error_code
2443 ARCFOUR_encrypt(krb5_context context,
2444 struct key_data *key,
2447 krb5_boolean encryptp,
2451 krb5_error_code ret;
2452 unsigned keyusage = usage;
2454 if((ret = usage2arcfour (context, &keyusage)) != 0)
2458 return ARCFOUR_subencrypt (context, key, data, len, keyusage, ivec);
2460 return ARCFOUR_subdecrypt (context, key, data, len, keyusage, ivec);
2468 static krb5_error_code
2469 AES_PRF(krb5_context context,
2471 const krb5_data *in,
2474 struct checksum_type *ct = crypto->et->checksum;
2475 krb5_error_code ret;
2477 krb5_keyblock *derived;
2479 result.cksumtype = ct->type;
2480 ret = krb5_data_alloc(&result.checksum, ct->checksumsize);
2482 krb5_set_error_string(context, "out memory");
2486 (*ct->checksum)(context, NULL, in->data, in->length, 0, &result);
2488 if (result.checksum.length < crypto->et->blocksize)
2489 krb5_abortx(context, "internal prf error");
2492 ret = krb5_derive_key(context, crypto->key.key,
2493 crypto->et->type, "prf", 3, &derived);
2495 krb5_abortx(context, "krb5_derive_key");
2497 ret = krb5_data_alloc(out, crypto->et->blocksize);
2499 krb5_abortx(context, "malloc failed");
2504 AES_set_encrypt_key(derived->keyvalue.data,
2505 crypto->et->keytype->bits, &key);
2506 AES_encrypt(result.checksum.data, out->data, &key);
2507 memset(&key, 0, sizeof(key));
2510 krb5_data_free(&result.checksum);
2511 krb5_free_keyblock(context, derived);
2517 * these should currently be in reverse preference order.
2518 * (only relevant for !F_PSEUDO) */
2520 static struct encryption_type enctype_null = {
2535 static struct encryption_type enctype_des_cbc_crc = {
2546 DES_CBC_encrypt_key_ivec,
2550 static struct encryption_type enctype_des_cbc_md4 = {
2559 &checksum_rsa_md4_des,
2561 DES_CBC_encrypt_null_ivec,
2565 static struct encryption_type enctype_des_cbc_md5 = {
2574 &checksum_rsa_md5_des,
2576 DES_CBC_encrypt_null_ivec,
2580 static struct encryption_type enctype_arcfour_hmac_md5 = {
2581 ETYPE_ARCFOUR_HMAC_MD5,
2595 static struct encryption_type enctype_des3_cbc_md5 = {
2604 &checksum_rsa_md5_des3,
2610 static struct encryption_type enctype_des3_cbc_sha1 = {
2611 ETYPE_DES3_CBC_SHA1,
2617 &keytype_des3_derived,
2619 &checksum_hmac_sha1_des3,
2625 static struct encryption_type enctype_old_des3_cbc_sha1 = {
2626 ETYPE_OLD_DES3_CBC_SHA1,
2627 "old-des3-cbc-sha1",
2634 &checksum_hmac_sha1_des3,
2640 static struct encryption_type enctype_aes128_cts_hmac_sha1 = {
2641 ETYPE_AES128_CTS_HMAC_SHA1_96,
2642 "aes128-cts-hmac-sha1-96",
2649 &checksum_hmac_sha1_aes128,
2655 static struct encryption_type enctype_aes256_cts_hmac_sha1 = {
2656 ETYPE_AES256_CTS_HMAC_SHA1_96,
2657 "aes256-cts-hmac-sha1-96",
2664 &checksum_hmac_sha1_aes256,
2670 static struct encryption_type enctype_des_cbc_none = {
2681 DES_CBC_encrypt_null_ivec,
2685 static struct encryption_type enctype_des_cfb64_none = {
2686 ETYPE_DES_CFB64_NONE,
2696 DES_CFB64_encrypt_null_ivec,
2700 static struct encryption_type enctype_des_pcbc_none = {
2701 ETYPE_DES_PCBC_NONE,
2711 DES_PCBC_encrypt_key_ivec,
2715 static struct encryption_type enctype_des3_cbc_none = {
2716 ETYPE_DES3_CBC_NONE,
2722 &keytype_des3_derived,
2731 static struct encryption_type *etypes[] = {
2733 &enctype_des_cbc_crc,
2734 &enctype_des_cbc_md4,
2735 &enctype_des_cbc_md5,
2736 &enctype_arcfour_hmac_md5,
2737 &enctype_des3_cbc_md5,
2738 &enctype_des3_cbc_sha1,
2739 &enctype_old_des3_cbc_sha1,
2740 &enctype_aes128_cts_hmac_sha1,
2741 &enctype_aes256_cts_hmac_sha1,
2742 &enctype_des_cbc_none,
2743 &enctype_des_cfb64_none,
2744 &enctype_des_pcbc_none,
2745 &enctype_des3_cbc_none
2748 static unsigned num_etypes = sizeof(etypes) / sizeof(etypes[0]);
2751 static struct encryption_type *
2752 _find_enctype(krb5_enctype type)
2755 for(i = 0; i < num_etypes; i++)
2756 if(etypes[i]->type == type)
2762 krb5_error_code KRB5_LIB_FUNCTION
2763 krb5_enctype_to_string(krb5_context context,
2767 struct encryption_type *e;
2768 e = _find_enctype(etype);
2770 krb5_set_error_string (context, "encryption type %d not supported",
2773 return KRB5_PROG_ETYPE_NOSUPP;
2775 *string = strdup(e->name);
2776 if(*string == NULL) {
2777 krb5_set_error_string(context, "malloc: out of memory");
2783 krb5_error_code KRB5_LIB_FUNCTION
2784 krb5_string_to_enctype(krb5_context context,
2786 krb5_enctype *etype)
2789 for(i = 0; i < num_etypes; i++)
2790 if(strcasecmp(etypes[i]->name, string) == 0){
2791 *etype = etypes[i]->type;
2794 krb5_set_error_string (context, "encryption type %s not supported",
2796 return KRB5_PROG_ETYPE_NOSUPP;
2799 krb5_error_code KRB5_LIB_FUNCTION
2800 _krb5_enctype_to_oid(krb5_context context,
2804 struct encryption_type *et = _find_enctype(etype);
2806 krb5_set_error_string (context, "encryption type %d not supported",
2808 return KRB5_PROG_ETYPE_NOSUPP;
2810 if(et->oid == NULL) {
2811 krb5_set_error_string (context, "%s have not oid", et->name);
2812 return KRB5_PROG_ETYPE_NOSUPP;
2814 krb5_clear_error_string(context);
2815 return der_copy_oid(et->oid, oid);
2818 krb5_error_code KRB5_LIB_FUNCTION
2819 _krb5_oid_to_enctype(krb5_context context,
2820 const heim_oid *oid,
2821 krb5_enctype *etype)
2824 for(i = 0; i < num_etypes; i++) {
2825 if(etypes[i]->oid && der_heim_oid_cmp(etypes[i]->oid, oid) == 0) {
2826 *etype = etypes[i]->type;
2830 krb5_set_error_string(context, "enctype for oid not supported");
2831 return KRB5_PROG_ETYPE_NOSUPP;
2834 krb5_error_code KRB5_LIB_FUNCTION
2835 krb5_enctype_to_keytype(krb5_context context,
2837 krb5_keytype *keytype)
2839 struct encryption_type *e = _find_enctype(etype);
2841 krb5_set_error_string (context, "encryption type %d not supported",
2843 return KRB5_PROG_ETYPE_NOSUPP;
2845 *keytype = e->keytype->type; /* XXX */
2850 krb5_error_code KRB5_LIB_FUNCTION
2851 krb5_keytype_to_enctype(krb5_context context,
2852 krb5_keytype keytype,
2853 krb5_enctype *etype)
2855 struct key_type *kt = _find_keytype(keytype);
2856 krb5_warnx(context, "krb5_keytype_to_enctype(%u)", keytype);
2858 return KRB5_PROG_KEYTYPE_NOSUPP;
2859 *etype = kt->best_etype;
2864 krb5_error_code KRB5_LIB_FUNCTION
2865 krb5_keytype_to_enctypes (krb5_context context,
2866 krb5_keytype keytype,
2874 for (i = num_etypes - 1; i >= 0; --i) {
2875 if (etypes[i]->keytype->type == keytype
2876 && !(etypes[i]->flags & F_PSEUDO))
2879 ret = malloc(n * sizeof(*ret));
2880 if (ret == NULL && n != 0) {
2881 krb5_set_error_string(context, "malloc: out of memory");
2885 for (i = num_etypes - 1; i >= 0; --i) {
2886 if (etypes[i]->keytype->type == keytype
2887 && !(etypes[i]->flags & F_PSEUDO))
2888 ret[n++] = etypes[i]->type;
2896 * First take the configured list of etypes for `keytype' if available,
2897 * else, do `krb5_keytype_to_enctypes'.
2900 krb5_error_code KRB5_LIB_FUNCTION
2901 krb5_keytype_to_enctypes_default (krb5_context context,
2902 krb5_keytype keytype,
2909 if (keytype != KEYTYPE_DES || context->etypes_des == NULL)
2910 return krb5_keytype_to_enctypes (context, keytype, len, val);
2912 for (n = 0; context->etypes_des[n]; ++n)
2914 ret = malloc (n * sizeof(*ret));
2915 if (ret == NULL && n != 0) {
2916 krb5_set_error_string(context, "malloc: out of memory");
2919 for (i = 0; i < n; ++i)
2920 ret[i] = context->etypes_des[i];
2926 krb5_error_code KRB5_LIB_FUNCTION
2927 krb5_enctype_valid(krb5_context context,
2930 struct encryption_type *e = _find_enctype(etype);
2932 krb5_set_error_string (context, "encryption type %d not supported",
2934 return KRB5_PROG_ETYPE_NOSUPP;
2936 if (e->flags & F_DISABLED) {
2937 krb5_set_error_string (context, "encryption type %s is disabled",
2939 return KRB5_PROG_ETYPE_NOSUPP;
2944 krb5_error_code KRB5_LIB_FUNCTION
2945 krb5_cksumtype_valid(krb5_context context,
2946 krb5_cksumtype ctype)
2948 struct checksum_type *c = _find_checksum(ctype);
2950 krb5_set_error_string (context, "checksum type %d not supported",
2952 return KRB5_PROG_SUMTYPE_NOSUPP;
2954 if (c->flags & F_DISABLED) {
2955 krb5_set_error_string (context, "checksum type %s is disabled",
2957 return KRB5_PROG_SUMTYPE_NOSUPP;
2963 /* if two enctypes have compatible keys */
2964 krb5_boolean KRB5_LIB_FUNCTION
2965 krb5_enctypes_compatible_keys(krb5_context context,
2966 krb5_enctype etype1,
2967 krb5_enctype etype2)
2969 struct encryption_type *e1 = _find_enctype(etype1);
2970 struct encryption_type *e2 = _find_enctype(etype2);
2971 return e1 != NULL && e2 != NULL && e1->keytype == e2->keytype;
2975 derived_crypto(krb5_context context,
2978 return (crypto->et->flags & F_DERIVED) != 0;
2982 special_crypto(krb5_context context,
2985 return (crypto->et->flags & F_SPECIAL) != 0;
2988 #define CHECKSUMSIZE(C) ((C)->checksumsize)
2989 #define CHECKSUMTYPE(C) ((C)->type)
2991 static krb5_error_code
2992 encrypt_internal_derived(krb5_context context,
3000 size_t sz, block_sz, checksum_sz, total_sz;
3002 unsigned char *p, *q;
3003 krb5_error_code ret;
3004 struct key_data *dkey;
3005 const struct encryption_type *et = crypto->et;
3007 checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
3009 sz = et->confoundersize + len;
3010 block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
3011 total_sz = block_sz + checksum_sz;
3012 p = calloc(1, total_sz);
3014 krb5_set_error_string(context, "malloc: out of memory");
3019 krb5_generate_random_block(q, et->confoundersize); /* XXX */
3020 q += et->confoundersize;
3021 memcpy(q, data, len);
3023 ret = create_checksum(context,
3026 INTEGRITY_USAGE(usage),
3030 if(ret == 0 && cksum.checksum.length != checksum_sz) {
3031 free_Checksum (&cksum);
3032 krb5_clear_error_string (context);
3033 ret = KRB5_CRYPTO_INTERNAL;
3037 memcpy(p + block_sz, cksum.checksum.data, cksum.checksum.length);
3038 free_Checksum (&cksum);
3039 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
3042 ret = _key_schedule(context, dkey);
3046 krb5_crypto_debug(context, 1, block_sz, dkey->key);
3048 ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec);
3052 result->length = total_sz;
3055 memset(p, 0, total_sz);
3061 static krb5_error_code
3062 encrypt_internal(krb5_context context,
3069 size_t sz, block_sz, checksum_sz;
3071 unsigned char *p, *q;
3072 krb5_error_code ret;
3073 const struct encryption_type *et = crypto->et;
3075 checksum_sz = CHECKSUMSIZE(et->checksum);
3077 sz = et->confoundersize + checksum_sz + len;
3078 block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
3079 p = calloc(1, block_sz);
3081 krb5_set_error_string(context, "malloc: out of memory");
3086 krb5_generate_random_block(q, et->confoundersize); /* XXX */
3087 q += et->confoundersize;
3088 memset(q, 0, checksum_sz);
3090 memcpy(q, data, len);
3092 ret = create_checksum(context,
3099 if(ret == 0 && cksum.checksum.length != checksum_sz) {
3100 krb5_clear_error_string (context);
3101 free_Checksum(&cksum);
3102 ret = KRB5_CRYPTO_INTERNAL;
3106 memcpy(p + et->confoundersize, cksum.checksum.data, cksum.checksum.length);
3107 free_Checksum(&cksum);
3108 ret = _key_schedule(context, &crypto->key);
3112 krb5_crypto_debug(context, 1, block_sz, crypto->key.key);
3114 ret = (*et->encrypt)(context, &crypto->key, p, block_sz, 1, 0, ivec);
3116 memset(p, 0, block_sz);
3121 result->length = block_sz;
3124 memset(p, 0, block_sz);
3129 static krb5_error_code
3130 encrypt_internal_special(krb5_context context,
3138 struct encryption_type *et = crypto->et;
3139 size_t cksum_sz = CHECKSUMSIZE(et->checksum);
3140 size_t sz = len + cksum_sz + et->confoundersize;
3142 krb5_error_code ret;
3146 krb5_set_error_string(context, "malloc: out of memory");
3150 memset (p, 0, cksum_sz);
3152 krb5_generate_random_block(p, et->confoundersize);
3153 p += et->confoundersize;
3154 memcpy (p, data, len);
3155 ret = (*et->encrypt)(context, &crypto->key, tmp, sz, TRUE, usage, ivec);
3162 result->length = sz;
3166 static krb5_error_code
3167 decrypt_internal_derived(krb5_context context,
3178 krb5_error_code ret;
3179 struct key_data *dkey;
3180 struct encryption_type *et = crypto->et;
3183 checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
3184 if (len < checksum_sz + et->confoundersize) {
3185 krb5_set_error_string(context, "Encrypted data shorter then "
3186 "checksum + confunder");
3187 return KRB5_BAD_MSIZE;
3190 if (((len - checksum_sz) % et->padsize) != 0) {
3191 krb5_clear_error_string(context);
3192 return KRB5_BAD_MSIZE;
3196 if(len != 0 && p == NULL) {
3197 krb5_set_error_string(context, "malloc: out of memory");
3200 memcpy(p, data, len);
3204 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
3209 ret = _key_schedule(context, dkey);
3215 krb5_crypto_debug(context, 0, len, dkey->key);
3217 ret = (*et->encrypt)(context, dkey, p, len, 0, usage, ivec);
3223 cksum.checksum.data = p + len;
3224 cksum.checksum.length = checksum_sz;
3225 cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
3227 ret = verify_checksum(context,
3229 INTEGRITY_USAGE(usage),
3237 l = len - et->confoundersize;
3238 memmove(p, p + et->confoundersize, l);
3239 result->data = realloc(p, l);
3240 if(result->data == NULL && l != 0) {
3242 krb5_set_error_string(context, "malloc: out of memory");
3249 static krb5_error_code
3250 decrypt_internal(krb5_context context,
3257 krb5_error_code ret;
3260 size_t checksum_sz, l;
3261 struct encryption_type *et = crypto->et;
3263 if ((len % et->padsize) != 0) {
3264 krb5_clear_error_string(context);
3265 return KRB5_BAD_MSIZE;
3268 checksum_sz = CHECKSUMSIZE(et->checksum);
3270 if(len != 0 && p == NULL) {
3271 krb5_set_error_string(context, "malloc: out of memory");
3274 memcpy(p, data, len);
3276 ret = _key_schedule(context, &crypto->key);
3282 krb5_crypto_debug(context, 0, len, crypto->key.key);
3284 ret = (*et->encrypt)(context, &crypto->key, p, len, 0, 0, ivec);
3289 ret = krb5_data_copy(&cksum.checksum, p + et->confoundersize, checksum_sz);
3294 memset(p + et->confoundersize, 0, checksum_sz);
3295 cksum.cksumtype = CHECKSUMTYPE(et->checksum);
3296 ret = verify_checksum(context, NULL, 0, p, len, &cksum);
3297 free_Checksum(&cksum);
3302 l = len - et->confoundersize - checksum_sz;
3303 memmove(p, p + et->confoundersize + checksum_sz, l);
3304 result->data = realloc(p, l);
3305 if(result->data == NULL && l != 0) {
3307 krb5_set_error_string(context, "malloc: out of memory");
3314 static krb5_error_code
3315 decrypt_internal_special(krb5_context context,
3323 struct encryption_type *et = crypto->et;
3324 size_t cksum_sz = CHECKSUMSIZE(et->checksum);
3325 size_t sz = len - cksum_sz - et->confoundersize;
3327 krb5_error_code ret;
3329 if ((len % et->padsize) != 0) {
3330 krb5_clear_error_string(context);
3331 return KRB5_BAD_MSIZE;
3336 krb5_set_error_string(context, "malloc: out of memory");
3339 memcpy(p, data, len);
3341 ret = (*et->encrypt)(context, &crypto->key, p, len, FALSE, usage, ivec);
3347 memmove (p, p + cksum_sz + et->confoundersize, sz);
3348 result->data = realloc(p, sz);
3349 if(result->data == NULL && sz != 0) {
3351 krb5_set_error_string(context, "malloc: out of memory");
3354 result->length = sz;
3359 krb5_error_code KRB5_LIB_FUNCTION
3360 krb5_encrypt_ivec(krb5_context context,
3368 if(derived_crypto(context, crypto))
3369 return encrypt_internal_derived(context, crypto, usage,
3370 data, len, result, ivec);
3371 else if (special_crypto(context, crypto))
3372 return encrypt_internal_special (context, crypto, usage,
3373 data, len, result, ivec);
3375 return encrypt_internal(context, crypto, data, len, result, ivec);
3378 krb5_error_code KRB5_LIB_FUNCTION
3379 krb5_encrypt(krb5_context context,
3386 return krb5_encrypt_ivec(context, crypto, usage, data, len, result, NULL);
3389 krb5_error_code KRB5_LIB_FUNCTION
3390 krb5_encrypt_EncryptedData(krb5_context context,
3396 EncryptedData *result)
3398 result->etype = CRYPTO_ETYPE(crypto);
3400 ALLOC(result->kvno, 1);
3401 *result->kvno = kvno;
3403 result->kvno = NULL;
3404 return krb5_encrypt(context, crypto, usage, data, len, &result->cipher);
3407 krb5_error_code KRB5_LIB_FUNCTION
3408 krb5_decrypt_ivec(krb5_context context,
3416 if(derived_crypto(context, crypto))
3417 return decrypt_internal_derived(context, crypto, usage,
3418 data, len, result, ivec);
3419 else if (special_crypto (context, crypto))
3420 return decrypt_internal_special(context, crypto, usage,
3421 data, len, result, ivec);
3423 return decrypt_internal(context, crypto, data, len, result, ivec);
3426 krb5_error_code KRB5_LIB_FUNCTION
3427 krb5_decrypt(krb5_context context,
3434 return krb5_decrypt_ivec (context, crypto, usage, data, len, result,
3438 krb5_error_code KRB5_LIB_FUNCTION
3439 krb5_decrypt_EncryptedData(krb5_context context,
3442 const EncryptedData *e,
3445 return krb5_decrypt(context, crypto, usage,
3446 e->cipher.data, e->cipher.length, result);
3449 /************************************************************
3451 ************************************************************/
3453 #define ENTROPY_NEEDED 128
3456 seed_something(void)
3458 char buf[1024], seedfile[256];
3460 /* If there is a seed file, load it. But such a file cannot be trusted,
3461 so use 0 for the entropy estimate */
3462 if (RAND_file_name(seedfile, sizeof(seedfile))) {
3464 fd = open(seedfile, O_RDONLY);
3467 ret = read(fd, buf, sizeof(buf));
3469 RAND_add(buf, ret, 0.0);
3476 /* Calling RAND_status() will try to use /dev/urandom if it exists so
3477 we do not have to deal with it. */
3478 if (RAND_status() != 1) {
3479 krb5_context context;
3483 if (!krb5_init_context(&context)) {
3484 p = krb5_config_get_string(context, NULL, "libdefaults",
3485 "egd_socket", NULL);
3487 RAND_egd_bytes(p, ENTROPY_NEEDED);
3488 krb5_free_context(context);
3492 if (RAND_status() == 1) {
3493 /* Update the seed file */
3495 RAND_write_file(seedfile);
3502 void KRB5_LIB_FUNCTION
3503 krb5_generate_random_block(void *buf, size_t len)
3505 static int rng_initialized = 0;
3507 HEIMDAL_MUTEX_lock(&crypto_mutex);
3508 if (!rng_initialized) {
3509 if (seed_something())
3510 krb5_abortx(NULL, "Fatal: could not seed the "
3511 "random number generator");
3513 rng_initialized = 1;
3515 HEIMDAL_MUTEX_unlock(&crypto_mutex);
3516 if (RAND_bytes(buf, len) != 1)
3517 krb5_abortx(NULL, "Failed to generate random block");
3521 DES3_postproc(krb5_context context,
3522 unsigned char *k, size_t len, struct key_data *key)
3524 DES3_random_to_key(context, key->key, k, len);
3526 if (key->schedule) {
3527 krb5_free_data(context, key->schedule);
3528 key->schedule = NULL;
3532 static krb5_error_code
3533 derive_key(krb5_context context,
3534 struct encryption_type *et,
3535 struct key_data *key,
3536 const void *constant,
3540 unsigned int nblocks = 0, i;
3541 krb5_error_code ret = 0;
3542 struct key_type *kt = et->keytype;
3544 ret = _key_schedule(context, key);
3547 if(et->blocksize * 8 < kt->bits || len != et->blocksize) {
3548 nblocks = (kt->bits + et->blocksize * 8 - 1) / (et->blocksize * 8);
3549 k = malloc(nblocks * et->blocksize);
3551 krb5_set_error_string(context, "malloc: out of memory");
3554 ret = _krb5_n_fold(constant, len, k, et->blocksize);
3557 krb5_set_error_string(context, "out of memory");
3560 for(i = 0; i < nblocks; i++) {
3562 memcpy(k + i * et->blocksize,
3563 k + (i - 1) * et->blocksize,
3565 (*et->encrypt)(context, key, k + i * et->blocksize, et->blocksize,
3569 /* this case is probably broken, but won't be run anyway */
3570 void *c = malloc(len);
3571 size_t res_len = (kt->bits + 7) / 8;
3573 if(len != 0 && c == NULL) {
3574 krb5_set_error_string(context, "malloc: out of memory");
3577 memcpy(c, constant, len);
3578 (*et->encrypt)(context, key, c, len, 1, 0, NULL);
3579 k = malloc(res_len);
3580 if(res_len != 0 && k == NULL) {
3582 krb5_set_error_string(context, "malloc: out of memory");
3585 ret = _krb5_n_fold(c, len, k, res_len);
3588 krb5_set_error_string(context, "out of memory");
3594 /* XXX keytype dependent post-processing */
3597 DES3_postproc(context, k, nblocks * et->blocksize, key);
3599 case KEYTYPE_AES128:
3600 case KEYTYPE_AES256:
3601 memcpy(key->key->keyvalue.data, k, key->key->keyvalue.length);
3604 krb5_set_error_string(context,
3605 "derive_key() called with unknown keytype (%u)",
3607 ret = KRB5_CRYPTO_INTERNAL;
3610 if (key->schedule) {
3611 krb5_free_data(context, key->schedule);
3612 key->schedule = NULL;
3614 memset(k, 0, nblocks * et->blocksize);
3619 static struct key_data *
3620 _new_derived_key(krb5_crypto crypto, unsigned usage)
3622 struct key_usage *d = crypto->key_usage;
3623 d = realloc(d, (crypto->num_key_usage + 1) * sizeof(*d));
3626 crypto->key_usage = d;
3627 d += crypto->num_key_usage++;
3628 memset(d, 0, sizeof(*d));
3633 krb5_error_code KRB5_LIB_FUNCTION
3634 krb5_derive_key(krb5_context context,
3635 const krb5_keyblock *key,
3637 const void *constant,
3638 size_t constant_len,
3639 krb5_keyblock **derived_key)
3641 krb5_error_code ret;
3642 struct encryption_type *et;
3645 *derived_key = NULL;
3647 et = _find_enctype (etype);
3649 krb5_set_error_string(context, "encryption type %d not supported",
3651 return KRB5_PROG_ETYPE_NOSUPP;
3654 ret = krb5_copy_keyblock(context, key, &d.key);
3659 ret = derive_key(context, et, &d, constant, constant_len);
3661 ret = krb5_copy_keyblock(context, d.key, derived_key);
3662 free_key_data(context, &d);
3666 static krb5_error_code
3667 _get_derived_key(krb5_context context,
3670 struct key_data **key)
3674 unsigned char constant[5];
3676 for(i = 0; i < crypto->num_key_usage; i++)
3677 if(crypto->key_usage[i].usage == usage) {
3678 *key = &crypto->key_usage[i].key;
3681 d = _new_derived_key(crypto, usage);
3683 krb5_set_error_string(context, "malloc: out of memory");
3686 krb5_copy_keyblock(context, crypto->key.key, &d->key);
3687 _krb5_put_int(constant, usage, 5);
3688 derive_key(context, crypto->et, d, constant, sizeof(constant));
3694 krb5_error_code KRB5_LIB_FUNCTION
3695 krb5_crypto_init(krb5_context context,
3696 const krb5_keyblock *key,
3698 krb5_crypto *crypto)
3700 krb5_error_code ret;
3702 if(*crypto == NULL) {
3703 krb5_set_error_string(context, "malloc: out of memory");
3706 if(etype == ETYPE_NULL)
3707 etype = key->keytype;
3708 (*crypto)->et = _find_enctype(etype);
3709 if((*crypto)->et == NULL || ((*crypto)->et->flags & F_DISABLED)) {
3712 krb5_set_error_string (context, "encryption type %d not supported",
3714 return KRB5_PROG_ETYPE_NOSUPP;
3716 if((*crypto)->et->keytype->size != key->keyvalue.length) {
3719 krb5_set_error_string (context, "encryption key has bad length");
3720 return KRB5_BAD_KEYSIZE;
3722 ret = krb5_copy_keyblock(context, key, &(*crypto)->key.key);
3728 (*crypto)->key.schedule = NULL;
3729 (*crypto)->num_key_usage = 0;
3730 (*crypto)->key_usage = NULL;
3735 free_key_data(krb5_context context, struct key_data *key)
3737 krb5_free_keyblock(context, key->key);
3739 memset(key->schedule->data, 0, key->schedule->length);
3740 krb5_free_data(context, key->schedule);
3745 free_key_usage(krb5_context context, struct key_usage *ku)
3747 free_key_data(context, &ku->key);
3750 krb5_error_code KRB5_LIB_FUNCTION
3751 krb5_crypto_destroy(krb5_context context,
3756 for(i = 0; i < crypto->num_key_usage; i++)
3757 free_key_usage(context, &crypto->key_usage[i]);
3758 free(crypto->key_usage);
3759 free_key_data(context, &crypto->key);
3764 krb5_error_code KRB5_LIB_FUNCTION
3765 krb5_crypto_getblocksize(krb5_context context,
3769 *blocksize = crypto->et->blocksize;
3773 krb5_error_code KRB5_LIB_FUNCTION
3774 krb5_crypto_getenctype(krb5_context context,
3776 krb5_enctype *enctype)
3778 *enctype = crypto->et->type;
3782 krb5_error_code KRB5_LIB_FUNCTION
3783 krb5_crypto_getpadsize(krb5_context context,
3787 *padsize = crypto->et->padsize;
3791 krb5_error_code KRB5_LIB_FUNCTION
3792 krb5_crypto_getconfoundersize(krb5_context context,
3794 size_t *confoundersize)
3796 *confoundersize = crypto->et->confoundersize;
3800 krb5_error_code KRB5_LIB_FUNCTION
3801 krb5_enctype_disable(krb5_context context,
3802 krb5_enctype enctype)
3804 struct encryption_type *et = _find_enctype(enctype);
3807 krb5_set_error_string (context, "encryption type %d not supported",
3809 return KRB5_PROG_ETYPE_NOSUPP;
3811 et->flags |= F_DISABLED;
3815 krb5_error_code KRB5_LIB_FUNCTION
3816 krb5_string_to_key_derived(krb5_context context,
3822 struct encryption_type *et = _find_enctype(etype);
3823 krb5_error_code ret;
3829 krb5_set_error_string (context, "encryption type %d not supported",
3831 return KRB5_PROG_ETYPE_NOSUPP;
3833 keylen = et->keytype->bits / 8;
3836 if(kd.key == NULL) {
3837 krb5_set_error_string (context, "malloc: out of memory");
3840 ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
3845 kd.key->keytype = etype;
3846 tmp = malloc (keylen);
3848 krb5_free_keyblock(context, kd.key);
3849 krb5_set_error_string (context, "malloc: out of memory");
3852 ret = _krb5_n_fold(str, len, tmp, keylen);
3855 krb5_set_error_string(context, "out of memory");
3859 DES3_postproc (context, tmp, keylen, &kd); /* XXX */
3860 memset(tmp, 0, keylen);
3862 ret = derive_key(context,
3865 "kerberos", /* XXX well known constant */
3866 strlen("kerberos"));
3867 ret = krb5_copy_keyblock_contents(context, kd.key, key);
3868 free_key_data(context, &kd);
3873 wrapped_length (krb5_context context,
3877 struct encryption_type *et = crypto->et;
3878 size_t padsize = et->padsize;
3879 size_t checksumsize = CHECKSUMSIZE(et->checksum);
3882 res = et->confoundersize + checksumsize + data_len;
3883 res = (res + padsize - 1) / padsize * padsize;
3888 wrapped_length_dervied (krb5_context context,
3892 struct encryption_type *et = crypto->et;
3893 size_t padsize = et->padsize;
3896 res = et->confoundersize + data_len;
3897 res = (res + padsize - 1) / padsize * padsize;
3898 if (et->keyed_checksum)
3899 res += et->keyed_checksum->checksumsize;
3901 res += et->checksum->checksumsize;
3906 * Return the size of an encrypted packet of length `data_len'
3910 krb5_get_wrapped_length (krb5_context context,
3914 if (derived_crypto (context, crypto))
3915 return wrapped_length_dervied (context, crypto, data_len);
3917 return wrapped_length (context, crypto, data_len);
3921 * Return the size of an encrypted packet of length `data_len'
3925 crypto_overhead (krb5_context context,
3928 struct encryption_type *et = crypto->et;
3931 res = CHECKSUMSIZE(et->checksum);
3932 res += et->confoundersize;
3933 if (et->padsize > 1)
3939 crypto_overhead_dervied (krb5_context context,
3942 struct encryption_type *et = crypto->et;
3945 if (et->keyed_checksum)
3946 res = CHECKSUMSIZE(et->keyed_checksum);
3948 res = CHECKSUMSIZE(et->checksum);
3949 res += et->confoundersize;
3950 if (et->padsize > 1)
3956 krb5_crypto_overhead (krb5_context context, krb5_crypto crypto)
3958 if (derived_crypto (context, crypto))
3959 return crypto_overhead_dervied (context, crypto);
3961 return crypto_overhead (context, crypto);
3964 krb5_error_code KRB5_LIB_FUNCTION
3965 krb5_random_to_key(krb5_context context,
3971 krb5_error_code ret;
3972 struct encryption_type *et = _find_enctype(type);
3974 krb5_set_error_string(context, "encryption type %d not supported",
3976 return KRB5_PROG_ETYPE_NOSUPP;
3978 if ((et->keytype->bits + 7) / 8 > size) {
3979 krb5_set_error_string(context, "encryption key %s needs %d bytes "
3980 "of random to make an encryption key out of it",
3981 et->name, (int)et->keytype->size);
3982 return KRB5_PROG_ETYPE_NOSUPP;
3984 ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
3987 key->keytype = type;
3988 if (et->keytype->random_to_key)
3989 (*et->keytype->random_to_key)(context, key, data, size);
3991 memcpy(key->keyvalue.data, data, et->keytype->size);
3997 _krb5_pk_octetstring2key(krb5_context context,
4001 const heim_octet_string *c_n,
4002 const heim_octet_string *k_n,
4005 struct encryption_type *et = _find_enctype(type);
4006 krb5_error_code ret;
4007 size_t keylen, offset;
4009 unsigned char counter;
4010 unsigned char shaoutput[20];
4013 krb5_set_error_string(context, "encryption type %d not supported",
4015 return KRB5_PROG_ETYPE_NOSUPP;
4017 keylen = (et->keytype->bits + 7) / 8;
4019 keydata = malloc(keylen);
4020 if (keydata == NULL) {
4021 krb5_set_error_string(context, "malloc: out of memory");
4031 SHA1_Update(&m, &counter, 1);
4032 SHA1_Update(&m, dhdata, dhsize);
4034 SHA1_Update(&m, c_n->data, c_n->length);
4036 SHA1_Update(&m, k_n->data, k_n->length);
4037 SHA1_Final(shaoutput, &m);
4039 memcpy((unsigned char *)keydata + offset,
4041 min(keylen - offset, sizeof(shaoutput)));
4043 offset += sizeof(shaoutput);
4045 } while(offset < keylen);
4046 memset(shaoutput, 0, sizeof(shaoutput));
4048 ret = krb5_random_to_key(context, type, keydata, keylen, key);
4049 memset(keydata, 0, sizeof(keylen));
4054 krb5_error_code KRB5_LIB_FUNCTION
4055 krb5_crypto_prf_length(krb5_context context,
4059 struct encryption_type *et = _find_enctype(type);
4061 if(et == NULL || et->prf_length == 0) {
4062 krb5_set_error_string(context, "encryption type %d not supported",
4064 return KRB5_PROG_ETYPE_NOSUPP;
4067 *length = et->prf_length;
4071 krb5_error_code KRB5_LIB_FUNCTION
4072 krb5_crypto_prf(krb5_context context,
4073 const krb5_crypto crypto,
4074 const krb5_data *input,
4077 struct encryption_type *et = crypto->et;
4079 krb5_data_zero(output);
4081 if(et->prf == NULL) {
4082 krb5_set_error_string(context, "kerberos prf for %s not supported",
4084 return KRB5_PROG_ETYPE_NOSUPP;
4087 return (*et->prf)(context, crypto, input, output);
4095 static krb5_error_code
4096 krb5_get_keyid(krb5_context context,
4101 unsigned char tmp[16];
4104 MD5_Update (&md5, key->keyvalue.data, key->keyvalue.length);
4105 MD5_Final (tmp, &md5);
4106 *keyid = (tmp[12] << 24) | (tmp[13] << 16) | (tmp[14] << 8) | tmp[15];
4111 krb5_crypto_debug(krb5_context context,
4118 krb5_get_keyid(context, key, &keyid);
4119 krb5_enctype_to_string(context, key->keytype, &kt);
4120 krb5_warnx(context, "%s %lu bytes with key-id %#x (%s)",
4121 encryptp ? "encrypting" : "decrypting",
4128 #endif /* CRYPTO_DEBUG */
4136 krb5_context context;
4141 unsigned usage = ENCRYPTION_USAGE(3);
4142 krb5_error_code ret;
4144 ret = krb5_init_context(&context);
4146 errx (1, "krb5_init_context failed: %d", ret);
4148 key.keytype = ETYPE_NEW_DES3_CBC_SHA1;
4149 key.keyvalue.data = "\xb3\x85\x58\x94\xd9\xdc\x7c\xc8"
4150 "\x25\xe9\x85\xab\x3e\xb5\xfb\x0e"
4151 "\xc8\xdf\xab\x26\x86\x64\x15\x25";
4152 key.keyvalue.length = 24;
4154 krb5_crypto_init(context, &key, 0, &crypto);
4156 d = _new_derived_key(crypto, usage);
4158 krb5_errx(context, 1, "_new_derived_key failed");
4159 krb5_copy_keyblock(context, crypto->key.key, &d->key);
4160 _krb5_put_int(constant, usage, 4);
4161 derive_key(context, crypto->et, d, constant, sizeof(constant));
4165 krb5_context context;
4169 krb5_error_code ret;
4172 char *data = "what do ya want for nothing?";
4174 ret = krb5_init_context(&context);
4176 errx (1, "krb5_init_context failed: %d", ret);
4178 key.keytype = ETYPE_NEW_DES3_CBC_SHA1;
4179 key.keyvalue.data = "Jefe";
4180 /* "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"
4181 "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"; */
4182 key.keyvalue.length = 4;
4184 d = ecalloc(1, sizeof(*d));
4186 res.checksum.length = 20;
4187 res.checksum.data = emalloc(res.checksum.length);
4188 SP_HMAC_SHA1_checksum(context, d, data, 28, &res);