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,v 1.145 2006/10/22 07:32:40 lha Exp $");
39 static void krb5_crypto_debug(krb5_context, int, size_t, krb5_keyblock*);
53 struct krb5_crypto_data {
54 struct encryption_type *et;
57 struct key_usage *key_usage;
60 #define kcrypto_oid_enc(n) { sizeof(n)/sizeof(n[0]), n }
62 #define CRYPTO_ETYPE(C) ((C)->et->type)
64 /* bits for `flags' below */
65 #define F_KEYED 1 /* checksum is keyed */
66 #define F_CPROOF 2 /* checksum is collision proof */
67 #define F_DERIVED 4 /* uses derived keys */
68 #define F_VARIANT 8 /* uses `variant' keys (6.4.3) */
69 #define F_PSEUDO 16 /* not a real protocol type */
70 #define F_SPECIAL 32 /* backwards */
71 #define F_DISABLED 64 /* enctype/checksum disabled */
76 krb5_error_code (*string_to_key)(krb5_context, krb5_enctype, krb5_data,
77 krb5_salt, krb5_data, krb5_keyblock*);
81 krb5_keytype type; /* XXX */
88 krb5_enctype best_etype;
90 void (*random_key)(krb5_context, krb5_keyblock*);
91 void (*schedule)(krb5_context, struct key_data *);
92 struct salt_type *string_to_key;
93 void (*random_to_key)(krb5_context, krb5_keyblock*, const void*, size_t);
96 struct checksum_type {
102 void (*checksum)(krb5_context context,
103 struct key_data *key,
104 const void *buf, size_t len,
107 krb5_error_code (*verify)(krb5_context context,
108 struct key_data *key,
109 const void *buf, size_t len,
114 struct encryption_type {
120 size_t confoundersize;
121 struct key_type *keytype;
122 struct checksum_type *checksum;
123 struct checksum_type *keyed_checksum;
125 krb5_error_code (*encrypt)(krb5_context context,
126 struct key_data *key,
127 void *data, size_t len,
128 krb5_boolean encryptp,
133 #define ENCRYPTION_USAGE(U) (((U) << 8) | 0xAA)
134 #define INTEGRITY_USAGE(U) (((U) << 8) | 0x55)
135 #define CHECKSUM_USAGE(U) (((U) << 8) | 0x99)
137 static struct checksum_type *_find_checksum(krb5_cksumtype type);
138 static struct encryption_type *_find_enctype(krb5_enctype type);
139 static struct key_type *_find_keytype(krb5_keytype type);
140 static krb5_error_code _get_derived_key(krb5_context, krb5_crypto,
141 unsigned, struct key_data**);
142 static struct key_data *_new_derived_key(krb5_crypto crypto, unsigned usage);
143 static krb5_error_code derive_key(krb5_context context,
144 struct encryption_type *et,
145 struct key_data *key,
146 const void *constant,
148 static krb5_error_code hmac(krb5_context context,
149 struct checksum_type *cm,
153 struct key_data *keyblock,
155 static void free_key_data(krb5_context context, struct key_data *key);
156 static krb5_error_code usage2arcfour (krb5_context, unsigned *);
157 static void xor (DES_cblock *, const unsigned char *);
159 /************************************************************
161 ************************************************************/
163 static HEIMDAL_MUTEX crypto_mutex = HEIMDAL_MUTEX_INITIALIZER;
167 krb5_DES_random_key(krb5_context context,
170 DES_cblock *k = key->keyvalue.data;
172 krb5_generate_random_block(k, sizeof(DES_cblock));
173 DES_set_odd_parity(k);
174 } while(DES_is_weak_key(k));
178 krb5_DES_schedule(krb5_context context,
179 struct key_data *key)
181 DES_set_key(key->key->keyvalue.data, key->schedule->data);
184 #ifdef ENABLE_AFS_STRING_TO_KEY
186 /* This defines the Andrew string_to_key function. It accepts a password
187 * string as input and converts its via a one-way encryption algorithm to a DES
188 * encryption key. It is compatible with the original Andrew authentication
189 * service password database.
193 * Short passwords, i.e 8 characters or less.
196 krb5_DES_AFS3_CMU_string_to_key (krb5_data pw,
200 char password[8+1]; /* crypt is limited to 8 chars anyway */
203 for(i = 0; i < 8; i++) {
204 char c = ((i < pw.length) ? ((char*)pw.data)[i] : 0) ^
206 tolower(((unsigned char*)cell.data)[i]) : 0);
207 password[i] = c ? c : 'X';
211 memcpy(key, crypt(password, "p1") + 2, sizeof(DES_cblock));
213 /* parity is inserted into the LSB so left shift each byte up one
214 bit. This allows ascii characters with a zero MSB to retain as
215 much significance as possible. */
216 for (i = 0; i < sizeof(DES_cblock); i++)
217 ((unsigned char*)key)[i] <<= 1;
218 DES_set_odd_parity (key);
222 * Long passwords, i.e 9 characters or more.
225 krb5_DES_AFS3_Transarc_string_to_key (krb5_data pw,
229 DES_key_schedule schedule;
235 memcpy(password, pw.data, min(pw.length, sizeof(password)));
236 if(pw.length < sizeof(password)) {
237 int len = min(cell.length, sizeof(password) - pw.length);
240 memcpy(password + pw.length, cell.data, len);
241 for (i = pw.length; i < pw.length + len; ++i)
242 password[i] = tolower((unsigned char)password[i]);
244 passlen = min(sizeof(password), pw.length + cell.length);
245 memcpy(&ivec, "kerberos", 8);
246 memcpy(&temp_key, "kerberos", 8);
247 DES_set_odd_parity (&temp_key);
248 DES_set_key (&temp_key, &schedule);
249 DES_cbc_cksum ((void*)password, &ivec, passlen, &schedule, &ivec);
251 memcpy(&temp_key, &ivec, 8);
252 DES_set_odd_parity (&temp_key);
253 DES_set_key (&temp_key, &schedule);
254 DES_cbc_cksum ((void*)password, key, passlen, &schedule, &ivec);
255 memset(&schedule, 0, sizeof(schedule));
256 memset(&temp_key, 0, sizeof(temp_key));
257 memset(&ivec, 0, sizeof(ivec));
258 memset(password, 0, sizeof(password));
260 DES_set_odd_parity (key);
263 static krb5_error_code
264 DES_AFS3_string_to_key(krb5_context context,
265 krb5_enctype enctype,
272 if(password.length > 8)
273 krb5_DES_AFS3_Transarc_string_to_key(password, salt.saltvalue, &tmp);
275 krb5_DES_AFS3_CMU_string_to_key(password, salt.saltvalue, &tmp);
276 key->keytype = enctype;
277 krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
278 memset(&key, 0, sizeof(key));
281 #endif /* ENABLE_AFS_STRING_TO_KEY */
284 DES_string_to_key_int(unsigned char *data, size_t length, DES_cblock *key)
286 DES_key_schedule schedule;
291 unsigned char swap[] = { 0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
292 0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf };
295 p = (unsigned char*)key;
296 for (i = 0; i < length; i++) {
297 unsigned char tmp = data[i];
301 *--p ^= (swap[tmp & 0xf] << 4) | swap[(tmp & 0xf0) >> 4];
305 DES_set_odd_parity(key);
306 if(DES_is_weak_key(key))
308 DES_set_key(key, &schedule);
309 DES_cbc_cksum((void*)data, key, length, &schedule, key);
310 memset(&schedule, 0, sizeof(schedule));
311 DES_set_odd_parity(key);
312 if(DES_is_weak_key(key))
316 static krb5_error_code
317 krb5_DES_string_to_key(krb5_context context,
318 krb5_enctype enctype,
328 #ifdef ENABLE_AFS_STRING_TO_KEY
329 if (opaque.length == 1) {
331 _krb5_get_int(opaque.data, &v, 1);
333 return DES_AFS3_string_to_key(context, enctype, password,
338 len = password.length + salt.saltvalue.length;
340 if(len > 0 && s == NULL) {
341 krb5_set_error_string(context, "malloc: out of memory");
344 memcpy(s, password.data, password.length);
345 memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
346 DES_string_to_key_int(s, len, &tmp);
347 key->keytype = enctype;
348 krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
349 memset(&tmp, 0, sizeof(tmp));
356 krb5_DES_random_to_key(krb5_context context,
361 DES_cblock *k = key->keyvalue.data;
362 memcpy(k, data, key->keyvalue.length);
363 DES_set_odd_parity(k);
364 if(DES_is_weak_key(k))
365 xor(k, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
373 DES3_random_key(krb5_context context,
376 DES_cblock *k = key->keyvalue.data;
378 krb5_generate_random_block(k, 3 * sizeof(DES_cblock));
379 DES_set_odd_parity(&k[0]);
380 DES_set_odd_parity(&k[1]);
381 DES_set_odd_parity(&k[2]);
382 } while(DES_is_weak_key(&k[0]) ||
383 DES_is_weak_key(&k[1]) ||
384 DES_is_weak_key(&k[2]));
388 DES3_schedule(krb5_context context,
389 struct key_data *key)
391 DES_cblock *k = key->key->keyvalue.data;
392 DES_key_schedule *s = key->schedule->data;
393 DES_set_key(&k[0], &s[0]);
394 DES_set_key(&k[1], &s[1]);
395 DES_set_key(&k[2], &s[2]);
399 * A = A xor B. A & B are 8 bytes.
403 xor (DES_cblock *key, const unsigned char *b)
405 unsigned char *a = (unsigned char*)key;
416 static krb5_error_code
417 DES3_string_to_key(krb5_context context,
418 krb5_enctype enctype,
426 unsigned char tmp[24];
429 len = password.length + salt.saltvalue.length;
431 if(len != 0 && str == NULL) {
432 krb5_set_error_string(context, "malloc: out of memory");
435 memcpy(str, password.data, password.length);
436 memcpy(str + password.length, salt.saltvalue.data, salt.saltvalue.length);
439 DES_key_schedule s[3];
442 _krb5_n_fold(str, len, tmp, 24);
444 for(i = 0; i < 3; i++){
445 memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
446 DES_set_odd_parity(keys + i);
447 if(DES_is_weak_key(keys + i))
448 xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
449 DES_set_key(keys + i, &s[i]);
451 memset(&ivec, 0, sizeof(ivec));
452 DES_ede3_cbc_encrypt(tmp,
454 &s[0], &s[1], &s[2], &ivec, DES_ENCRYPT);
455 memset(s, 0, sizeof(s));
456 memset(&ivec, 0, sizeof(ivec));
457 for(i = 0; i < 3; i++){
458 memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
459 DES_set_odd_parity(keys + i);
460 if(DES_is_weak_key(keys + i))
461 xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
463 memset(tmp, 0, sizeof(tmp));
465 key->keytype = enctype;
466 krb5_data_copy(&key->keyvalue, keys, sizeof(keys));
467 memset(keys, 0, sizeof(keys));
473 static krb5_error_code
474 DES3_string_to_key_derived(krb5_context context,
475 krb5_enctype enctype,
482 size_t len = password.length + salt.saltvalue.length;
486 if(len != 0 && s == NULL) {
487 krb5_set_error_string(context, "malloc: out of memory");
490 memcpy(s, password.data, password.length);
491 memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
492 ret = krb5_string_to_key_derived(context,
503 DES3_random_to_key(krb5_context context,
508 unsigned char *x = key->keyvalue.data;
509 const u_char *q = data;
513 memset(x, 0, sizeof(x));
514 for (i = 0; i < 3; ++i) {
516 for (j = 0; j < 7; ++j) {
517 unsigned char b = q[7 * i + j];
522 for (j = 6; j >= 0; --j) {
523 foo |= q[7 * i + j] & 1;
528 k = key->keyvalue.data;
529 for (i = 0; i < 3; i++) {
530 DES_set_odd_parity(&k[i]);
531 if(DES_is_weak_key(&k[i]))
532 xor(&k[i], (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
541 ARCFOUR_schedule(krb5_context context,
544 RC4_set_key (kd->schedule->data,
545 kd->key->keyvalue.length, kd->key->keyvalue.data);
548 static krb5_error_code
549 ARCFOUR_string_to_key(krb5_context context,
550 krb5_enctype enctype,
561 len = 2 * password.length;
563 if (len != 0 && s == NULL) {
564 krb5_set_error_string(context, "malloc: out of memory");
567 for (p = s, i = 0; i < password.length; ++i) {
568 *p++ = ((char *)password.data)[i];
572 MD4_Update (&m, s, len);
573 key->keytype = enctype;
574 krb5_data_alloc (&key->keyvalue, 16);
575 MD4_Final (key->keyvalue.data, &m);
585 int _krb5_AES_string_to_default_iterator = 4096;
587 static krb5_error_code
588 AES_string_to_key(krb5_context context,
589 krb5_enctype enctype,
597 struct encryption_type *et;
600 if (opaque.length == 0)
601 iter = _krb5_AES_string_to_default_iterator;
602 else if (opaque.length == 4) {
604 _krb5_get_int(opaque.data, &v, 4);
605 iter = ((uint32_t)v);
607 return KRB5_PROG_KEYTYPE_NOSUPP; /* XXX */
609 et = _find_enctype(enctype);
611 return KRB5_PROG_KEYTYPE_NOSUPP;
616 krb5_set_error_string (context, "malloc: out of memory");
619 kd.key->keytype = enctype;
620 ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
622 krb5_set_error_string(context, "Failed to allocate pkcs5 key");
626 ret = PKCS5_PBKDF2_HMAC_SHA1(password.data, password.length,
627 salt.saltvalue.data, salt.saltvalue.length,
629 et->keytype->size, kd.key->keyvalue.data);
631 free_key_data(context, &kd);
632 krb5_set_error_string(context, "Error calculating s2k");
633 return KRB5_PROG_KEYTYPE_NOSUPP;
636 ret = derive_key(context, et, &kd, "kerberos", strlen("kerberos"));
638 ret = krb5_copy_keyblock_contents(context, kd.key, key);
639 free_key_data(context, &kd);
644 struct krb5_aes_schedule {
650 AES_schedule(krb5_context context,
653 struct krb5_aes_schedule *key = kd->schedule->data;
654 int bits = kd->key->keyvalue.length * 8;
656 memset(key, 0, sizeof(*key));
657 AES_set_encrypt_key(kd->key->keyvalue.data, bits, &key->ekey);
658 AES_set_decrypt_key(kd->key->keyvalue.data, bits, &key->dkey);
665 static struct salt_type des_salt[] = {
669 krb5_DES_string_to_key
671 #ifdef ENABLE_AFS_STRING_TO_KEY
675 DES_AFS3_string_to_key
681 static struct salt_type des3_salt[] = {
690 static struct salt_type des3_salt_derived[] = {
694 DES3_string_to_key_derived
699 static struct salt_type AES_salt[] = {
708 static struct salt_type arcfour_salt[] = {
712 ARCFOUR_string_to_key
721 static struct key_type keytype_null = {
733 static struct key_type keytype_des = {
739 sizeof(DES_key_schedule),
743 krb5_DES_random_to_key
746 static struct key_type keytype_des3 = {
750 3 * sizeof(DES_cblock),
751 3 * sizeof(DES_cblock),
752 3 * sizeof(DES_key_schedule),
759 static struct key_type keytype_des3_derived = {
763 3 * sizeof(DES_cblock),
764 3 * sizeof(DES_cblock),
765 3 * sizeof(DES_key_schedule),
772 static struct key_type keytype_aes128 = {
778 sizeof(struct krb5_aes_schedule),
784 static struct key_type keytype_aes256 = {
790 sizeof(struct krb5_aes_schedule),
796 static struct key_type keytype_arcfour = {
808 static struct key_type *keytypes[] = {
811 &keytype_des3_derived,
818 static int num_keytypes = sizeof(keytypes) / sizeof(keytypes[0]);
820 static struct key_type *
821 _find_keytype(krb5_keytype type)
824 for(i = 0; i < num_keytypes; i++)
825 if(keytypes[i]->type == type)
831 krb5_error_code KRB5_LIB_FUNCTION
832 krb5_salttype_to_string (krb5_context context,
837 struct encryption_type *e;
838 struct salt_type *st;
840 e = _find_enctype (etype);
842 krb5_set_error_string(context, "encryption type %d not supported",
844 return KRB5_PROG_ETYPE_NOSUPP;
846 for (st = e->keytype->string_to_key; st && st->type; st++) {
847 if (st->type == stype) {
848 *string = strdup (st->name);
849 if (*string == NULL) {
850 krb5_set_error_string(context, "malloc: out of memory");
856 krb5_set_error_string(context, "salttype %d not supported", stype);
857 return HEIM_ERR_SALTTYPE_NOSUPP;
860 krb5_error_code KRB5_LIB_FUNCTION
861 krb5_string_to_salttype (krb5_context context,
864 krb5_salttype *salttype)
866 struct encryption_type *e;
867 struct salt_type *st;
869 e = _find_enctype (etype);
871 krb5_set_error_string(context, "encryption type %d not supported",
873 return KRB5_PROG_ETYPE_NOSUPP;
875 for (st = e->keytype->string_to_key; st && st->type; st++) {
876 if (strcasecmp (st->name, string) == 0) {
877 *salttype = st->type;
881 krb5_set_error_string(context, "salttype %s not supported", string);
882 return HEIM_ERR_SALTTYPE_NOSUPP;
885 krb5_error_code KRB5_LIB_FUNCTION
886 krb5_get_pw_salt(krb5_context context,
887 krb5_const_principal principal,
895 salt->salttype = KRB5_PW_SALT;
896 len = strlen(principal->realm);
897 for (i = 0; i < principal->name.name_string.len; ++i)
898 len += strlen(principal->name.name_string.val[i]);
899 ret = krb5_data_alloc (&salt->saltvalue, len);
902 p = salt->saltvalue.data;
903 memcpy (p, principal->realm, strlen(principal->realm));
904 p += strlen(principal->realm);
905 for (i = 0; i < principal->name.name_string.len; ++i) {
907 principal->name.name_string.val[i],
908 strlen(principal->name.name_string.val[i]));
909 p += strlen(principal->name.name_string.val[i]);
914 krb5_error_code KRB5_LIB_FUNCTION
915 krb5_free_salt(krb5_context context,
918 krb5_data_free(&salt.saltvalue);
922 krb5_error_code KRB5_LIB_FUNCTION
923 krb5_string_to_key_data (krb5_context context,
924 krb5_enctype enctype,
926 krb5_principal principal,
932 ret = krb5_get_pw_salt(context, principal, &salt);
935 ret = krb5_string_to_key_data_salt(context, enctype, password, salt, key);
936 krb5_free_salt(context, salt);
940 krb5_error_code KRB5_LIB_FUNCTION
941 krb5_string_to_key (krb5_context context,
942 krb5_enctype enctype,
943 const char *password,
944 krb5_principal principal,
948 pw.data = rk_UNCONST(password);
949 pw.length = strlen(password);
950 return krb5_string_to_key_data(context, enctype, pw, principal, key);
953 krb5_error_code KRB5_LIB_FUNCTION
954 krb5_string_to_key_data_salt (krb5_context context,
955 krb5_enctype enctype,
961 krb5_data_zero(&opaque);
962 return krb5_string_to_key_data_salt_opaque(context, enctype, password,
967 * Do a string -> key for encryption type `enctype' operation on
968 * `password' (with salt `salt' and the enctype specific data string
969 * `opaque'), returning the resulting key in `key'
972 krb5_error_code KRB5_LIB_FUNCTION
973 krb5_string_to_key_data_salt_opaque (krb5_context context,
974 krb5_enctype enctype,
980 struct encryption_type *et =_find_enctype(enctype);
981 struct salt_type *st;
983 krb5_set_error_string(context, "encryption type %d not supported",
985 return KRB5_PROG_ETYPE_NOSUPP;
987 for(st = et->keytype->string_to_key; st && st->type; st++)
988 if(st->type == salt.salttype)
989 return (*st->string_to_key)(context, enctype, password,
991 krb5_set_error_string(context, "salt type %d not supported",
993 return HEIM_ERR_SALTTYPE_NOSUPP;
997 * Do a string -> key for encryption type `enctype' operation on the
998 * string `password' (with salt `salt'), returning the resulting key
1002 krb5_error_code KRB5_LIB_FUNCTION
1003 krb5_string_to_key_salt (krb5_context context,
1004 krb5_enctype enctype,
1005 const char *password,
1010 pw.data = rk_UNCONST(password);
1011 pw.length = strlen(password);
1012 return krb5_string_to_key_data_salt(context, enctype, pw, salt, key);
1015 krb5_error_code KRB5_LIB_FUNCTION
1016 krb5_string_to_key_salt_opaque (krb5_context context,
1017 krb5_enctype enctype,
1018 const char *password,
1024 pw.data = rk_UNCONST(password);
1025 pw.length = strlen(password);
1026 return krb5_string_to_key_data_salt_opaque(context, enctype,
1027 pw, salt, opaque, key);
1030 krb5_error_code KRB5_LIB_FUNCTION
1031 krb5_keytype_to_string(krb5_context context,
1032 krb5_keytype keytype,
1035 struct key_type *kt = _find_keytype(keytype);
1037 krb5_set_error_string(context, "key type %d not supported", keytype);
1038 return KRB5_PROG_KEYTYPE_NOSUPP;
1040 *string = strdup(kt->name);
1041 if(*string == NULL) {
1042 krb5_set_error_string(context, "malloc: out of memory");
1048 krb5_error_code KRB5_LIB_FUNCTION
1049 krb5_string_to_keytype(krb5_context context,
1051 krb5_keytype *keytype)
1054 for(i = 0; i < num_keytypes; i++)
1055 if(strcasecmp(keytypes[i]->name, string) == 0){
1056 *keytype = keytypes[i]->type;
1059 krb5_set_error_string(context, "key type %s not supported", string);
1060 return KRB5_PROG_KEYTYPE_NOSUPP;
1063 krb5_error_code KRB5_LIB_FUNCTION
1064 krb5_enctype_keysize(krb5_context context,
1068 struct encryption_type *et = _find_enctype(type);
1070 krb5_set_error_string(context, "encryption type %d not supported",
1072 return KRB5_PROG_ETYPE_NOSUPP;
1074 *keysize = et->keytype->size;
1078 krb5_error_code KRB5_LIB_FUNCTION
1079 krb5_generate_random_keyblock(krb5_context context,
1083 krb5_error_code ret;
1084 struct encryption_type *et = _find_enctype(type);
1086 krb5_set_error_string(context, "encryption type %d not supported",
1088 return KRB5_PROG_ETYPE_NOSUPP;
1090 ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
1093 key->keytype = type;
1094 if(et->keytype->random_key)
1095 (*et->keytype->random_key)(context, key);
1097 krb5_generate_random_block(key->keyvalue.data,
1098 key->keyvalue.length);
1102 static krb5_error_code
1103 _key_schedule(krb5_context context,
1104 struct key_data *key)
1106 krb5_error_code ret;
1107 struct encryption_type *et = _find_enctype(key->key->keytype);
1108 struct key_type *kt = et->keytype;
1110 if(kt->schedule == NULL)
1112 if (key->schedule != NULL)
1114 ALLOC(key->schedule, 1);
1115 if(key->schedule == NULL) {
1116 krb5_set_error_string(context, "malloc: out of memory");
1119 ret = krb5_data_alloc(key->schedule, kt->schedule_size);
1121 free(key->schedule);
1122 key->schedule = NULL;
1125 (*kt->schedule)(context, key);
1129 /************************************************************
1131 ************************************************************/
1134 NONE_checksum(krb5_context context,
1135 struct key_data *key,
1144 CRC32_checksum(krb5_context context,
1145 struct key_data *key,
1152 unsigned char *r = C->checksum.data;
1153 _krb5_crc_init_table ();
1154 crc = _krb5_crc_update (data, len, 0);
1156 r[1] = (crc >> 8) & 0xff;
1157 r[2] = (crc >> 16) & 0xff;
1158 r[3] = (crc >> 24) & 0xff;
1162 RSA_MD4_checksum(krb5_context context,
1163 struct key_data *key,
1172 MD4_Update (&m, data, len);
1173 MD4_Final (C->checksum.data, &m);
1177 RSA_MD4_DES_checksum(krb5_context context,
1178 struct key_data *key,
1186 unsigned char *p = cksum->checksum.data;
1188 krb5_generate_random_block(p, 8);
1190 MD4_Update (&md4, p, 8);
1191 MD4_Update (&md4, data, len);
1192 MD4_Final (p + 8, &md4);
1193 memset (&ivec, 0, sizeof(ivec));
1197 key->schedule->data,
1202 static krb5_error_code
1203 RSA_MD4_DES_verify(krb5_context context,
1204 struct key_data *key,
1211 unsigned char tmp[24];
1212 unsigned char res[16];
1214 krb5_error_code ret = 0;
1216 memset(&ivec, 0, sizeof(ivec));
1217 DES_cbc_encrypt(C->checksum.data,
1220 key->schedule->data,
1224 MD4_Update (&md4, tmp, 8); /* confounder */
1225 MD4_Update (&md4, data, len);
1226 MD4_Final (res, &md4);
1227 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1228 krb5_clear_error_string (context);
1229 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1231 memset(tmp, 0, sizeof(tmp));
1232 memset(res, 0, sizeof(res));
1237 RSA_MD5_checksum(krb5_context context,
1238 struct key_data *key,
1247 MD5_Update(&m, data, len);
1248 MD5_Final (C->checksum.data, &m);
1252 RSA_MD5_DES_checksum(krb5_context context,
1253 struct key_data *key,
1261 unsigned char *p = C->checksum.data;
1263 krb5_generate_random_block(p, 8);
1265 MD5_Update (&md5, p, 8);
1266 MD5_Update (&md5, data, len);
1267 MD5_Final (p + 8, &md5);
1268 memset (&ivec, 0, sizeof(ivec));
1272 key->schedule->data,
1277 static krb5_error_code
1278 RSA_MD5_DES_verify(krb5_context context,
1279 struct key_data *key,
1286 unsigned char tmp[24];
1287 unsigned char res[16];
1289 DES_key_schedule *sched = key->schedule->data;
1290 krb5_error_code ret = 0;
1292 memset(&ivec, 0, sizeof(ivec));
1293 DES_cbc_encrypt(C->checksum.data,
1300 MD5_Update (&md5, tmp, 8); /* confounder */
1301 MD5_Update (&md5, data, len);
1302 MD5_Final (res, &md5);
1303 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1304 krb5_clear_error_string (context);
1305 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1307 memset(tmp, 0, sizeof(tmp));
1308 memset(res, 0, sizeof(res));
1313 RSA_MD5_DES3_checksum(krb5_context context,
1314 struct key_data *key,
1322 unsigned char *p = C->checksum.data;
1323 DES_key_schedule *sched = key->schedule->data;
1325 krb5_generate_random_block(p, 8);
1327 MD5_Update (&md5, p, 8);
1328 MD5_Update (&md5, data, len);
1329 MD5_Final (p + 8, &md5);
1330 memset (&ivec, 0, sizeof(ivec));
1331 DES_ede3_cbc_encrypt(p,
1334 &sched[0], &sched[1], &sched[2],
1339 static krb5_error_code
1340 RSA_MD5_DES3_verify(krb5_context context,
1341 struct key_data *key,
1348 unsigned char tmp[24];
1349 unsigned char res[16];
1351 DES_key_schedule *sched = key->schedule->data;
1352 krb5_error_code ret = 0;
1354 memset(&ivec, 0, sizeof(ivec));
1355 DES_ede3_cbc_encrypt(C->checksum.data,
1358 &sched[0], &sched[1], &sched[2],
1362 MD5_Update (&md5, tmp, 8); /* confounder */
1363 MD5_Update (&md5, data, len);
1364 MD5_Final (res, &md5);
1365 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1366 krb5_clear_error_string (context);
1367 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1369 memset(tmp, 0, sizeof(tmp));
1370 memset(res, 0, sizeof(res));
1375 SHA1_checksum(krb5_context context,
1376 struct key_data *key,
1385 SHA1_Update(&m, data, len);
1386 SHA1_Final(C->checksum.data, &m);
1389 /* HMAC according to RFC2104 */
1390 static krb5_error_code
1391 hmac(krb5_context context,
1392 struct checksum_type *cm,
1396 struct key_data *keyblock,
1399 unsigned char *ipad, *opad;
1404 ipad = malloc(cm->blocksize + len);
1407 opad = malloc(cm->blocksize + cm->checksumsize);
1412 memset(ipad, 0x36, cm->blocksize);
1413 memset(opad, 0x5c, cm->blocksize);
1415 if(keyblock->key->keyvalue.length > cm->blocksize){
1416 (*cm->checksum)(context,
1418 keyblock->key->keyvalue.data,
1419 keyblock->key->keyvalue.length,
1422 key = result->checksum.data;
1423 key_len = result->checksum.length;
1425 key = keyblock->key->keyvalue.data;
1426 key_len = keyblock->key->keyvalue.length;
1428 for(i = 0; i < key_len; i++){
1432 memcpy(ipad + cm->blocksize, data, len);
1433 (*cm->checksum)(context, keyblock, ipad, cm->blocksize + len,
1435 memcpy(opad + cm->blocksize, result->checksum.data,
1436 result->checksum.length);
1437 (*cm->checksum)(context, keyblock, opad,
1438 cm->blocksize + cm->checksumsize, usage, result);
1439 memset(ipad, 0, cm->blocksize + len);
1441 memset(opad, 0, cm->blocksize + cm->checksumsize);
1447 krb5_error_code KRB5_LIB_FUNCTION
1448 krb5_hmac(krb5_context context,
1449 krb5_cksumtype cktype,
1456 struct checksum_type *c = _find_checksum(cktype);
1458 krb5_error_code ret;
1461 krb5_set_error_string (context, "checksum type %d not supported",
1463 return KRB5_PROG_SUMTYPE_NOSUPP;
1469 ret = hmac(context, c, data, len, usage, &kd, result);
1472 krb5_free_data(context, kd.schedule);
1478 SP_HMAC_SHA1_checksum(krb5_context context,
1479 struct key_data *key,
1485 struct checksum_type *c = _find_checksum(CKSUMTYPE_SHA1);
1488 krb5_error_code ret;
1490 res.checksum.data = sha1_data;
1491 res.checksum.length = sizeof(sha1_data);
1493 ret = hmac(context, c, data, len, usage, key, &res);
1495 krb5_abortx(context, "hmac failed");
1496 memcpy(result->checksum.data, res.checksum.data, result->checksum.length);
1500 * checksum according to section 5. of draft-brezak-win2k-krb-rc4-hmac-03.txt
1504 HMAC_MD5_checksum(krb5_context context,
1505 struct key_data *key,
1512 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
1513 const char signature[] = "signaturekey";
1515 struct key_data ksign;
1518 unsigned char tmp[16];
1519 unsigned char ksign_c_data[16];
1520 krb5_error_code ret;
1522 ksign_c.checksum.length = sizeof(ksign_c_data);
1523 ksign_c.checksum.data = ksign_c_data;
1524 ret = hmac(context, c, signature, sizeof(signature), 0, key, &ksign_c);
1526 krb5_abortx(context, "hmac failed");
1528 kb.keyvalue = ksign_c.checksum;
1530 t[0] = (usage >> 0) & 0xFF;
1531 t[1] = (usage >> 8) & 0xFF;
1532 t[2] = (usage >> 16) & 0xFF;
1533 t[3] = (usage >> 24) & 0xFF;
1534 MD5_Update (&md5, t, 4);
1535 MD5_Update (&md5, data, len);
1536 MD5_Final (tmp, &md5);
1537 ret = hmac(context, c, tmp, sizeof(tmp), 0, &ksign, result);
1539 krb5_abortx(context, "hmac failed");
1543 * same as previous but being used while encrypting.
1547 HMAC_MD5_checksum_enc(krb5_context context,
1548 struct key_data *key,
1554 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
1556 struct key_data ksign;
1559 unsigned char ksign_c_data[16];
1560 krb5_error_code ret;
1562 t[0] = (usage >> 0) & 0xFF;
1563 t[1] = (usage >> 8) & 0xFF;
1564 t[2] = (usage >> 16) & 0xFF;
1565 t[3] = (usage >> 24) & 0xFF;
1567 ksign_c.checksum.length = sizeof(ksign_c_data);
1568 ksign_c.checksum.data = ksign_c_data;
1569 ret = hmac(context, c, t, sizeof(t), 0, key, &ksign_c);
1571 krb5_abortx(context, "hmac failed");
1573 kb.keyvalue = ksign_c.checksum;
1574 ret = hmac(context, c, data, len, 0, &ksign, result);
1576 krb5_abortx(context, "hmac failed");
1579 static struct checksum_type checksum_none = {
1588 static struct checksum_type checksum_crc32 = {
1597 static struct checksum_type checksum_rsa_md4 = {
1606 static struct checksum_type checksum_rsa_md4_des = {
1607 CKSUMTYPE_RSA_MD4_DES,
1611 F_KEYED | F_CPROOF | F_VARIANT,
1612 RSA_MD4_DES_checksum,
1616 static struct checksum_type checksum_des_mac = {
1624 static struct checksum_type checksum_des_mac_k = {
1625 CKSUMTYPE_DES_MAC_K,
1632 static struct checksum_type checksum_rsa_md4_des_k = {
1633 CKSUMTYPE_RSA_MD4_DES_K,
1638 RSA_MD4_DES_K_checksum,
1639 RSA_MD4_DES_K_verify
1642 static struct checksum_type checksum_rsa_md5 = {
1651 static struct checksum_type checksum_rsa_md5_des = {
1652 CKSUMTYPE_RSA_MD5_DES,
1656 F_KEYED | F_CPROOF | F_VARIANT,
1657 RSA_MD5_DES_checksum,
1660 static struct checksum_type checksum_rsa_md5_des3 = {
1661 CKSUMTYPE_RSA_MD5_DES3,
1665 F_KEYED | F_CPROOF | F_VARIANT,
1666 RSA_MD5_DES3_checksum,
1669 static struct checksum_type checksum_sha1 = {
1678 static struct checksum_type checksum_hmac_sha1_des3 = {
1679 CKSUMTYPE_HMAC_SHA1_DES3,
1683 F_KEYED | F_CPROOF | F_DERIVED,
1684 SP_HMAC_SHA1_checksum,
1688 static struct checksum_type checksum_hmac_sha1_aes128 = {
1689 CKSUMTYPE_HMAC_SHA1_96_AES_128,
1690 "hmac-sha1-96-aes128",
1693 F_KEYED | F_CPROOF | F_DERIVED,
1694 SP_HMAC_SHA1_checksum,
1698 static struct checksum_type checksum_hmac_sha1_aes256 = {
1699 CKSUMTYPE_HMAC_SHA1_96_AES_256,
1700 "hmac-sha1-96-aes256",
1703 F_KEYED | F_CPROOF | F_DERIVED,
1704 SP_HMAC_SHA1_checksum,
1708 static struct checksum_type checksum_hmac_md5 = {
1718 static struct checksum_type checksum_hmac_md5_enc = {
1719 CKSUMTYPE_HMAC_MD5_ENC,
1723 F_KEYED | F_CPROOF | F_PSEUDO,
1724 HMAC_MD5_checksum_enc,
1728 static struct checksum_type *checksum_types[] = {
1732 &checksum_rsa_md4_des,
1735 &checksum_des_mac_k,
1736 &checksum_rsa_md4_des_k,
1739 &checksum_rsa_md5_des,
1740 &checksum_rsa_md5_des3,
1742 &checksum_hmac_sha1_des3,
1743 &checksum_hmac_sha1_aes128,
1744 &checksum_hmac_sha1_aes256,
1746 &checksum_hmac_md5_enc
1749 static int num_checksums = sizeof(checksum_types) / sizeof(checksum_types[0]);
1751 static struct checksum_type *
1752 _find_checksum(krb5_cksumtype type)
1755 for(i = 0; i < num_checksums; i++)
1756 if(checksum_types[i]->type == type)
1757 return checksum_types[i];
1761 static krb5_error_code
1762 get_checksum_key(krb5_context context,
1764 unsigned usage, /* not krb5_key_usage */
1765 struct checksum_type *ct,
1766 struct key_data **key)
1768 krb5_error_code ret = 0;
1770 if(ct->flags & F_DERIVED)
1771 ret = _get_derived_key(context, crypto, usage, key);
1772 else if(ct->flags & F_VARIANT) {
1775 *key = _new_derived_key(crypto, 0xff/* KRB5_KU_RFC1510_VARIANT */);
1777 krb5_set_error_string(context, "malloc: out of memory");
1780 ret = krb5_copy_keyblock(context, crypto->key.key, &(*key)->key);
1783 for(i = 0; i < (*key)->key->keyvalue.length; i++)
1784 ((unsigned char*)(*key)->key->keyvalue.data)[i] ^= 0xF0;
1786 *key = &crypto->key;
1789 ret = _key_schedule(context, *key);
1793 static krb5_error_code
1794 create_checksum (krb5_context context,
1795 struct checksum_type *ct,
1802 krb5_error_code ret;
1803 struct key_data *dkey;
1806 if (ct->flags & F_DISABLED) {
1807 krb5_clear_error_string (context);
1808 return KRB5_PROG_SUMTYPE_NOSUPP;
1810 keyed_checksum = (ct->flags & F_KEYED) != 0;
1811 if(keyed_checksum && crypto == NULL) {
1812 krb5_set_error_string (context, "Checksum type %s is keyed "
1813 "but no crypto context (key) was passed in",
1815 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
1817 if(keyed_checksum) {
1818 ret = get_checksum_key(context, crypto, usage, ct, &dkey);
1823 result->cksumtype = ct->type;
1824 krb5_data_alloc(&result->checksum, ct->checksumsize);
1825 (*ct->checksum)(context, dkey, data, len, usage, result);
1830 arcfour_checksum_p(struct checksum_type *ct, krb5_crypto crypto)
1832 return (ct->type == CKSUMTYPE_HMAC_MD5) &&
1833 (crypto->key.key->keytype == KEYTYPE_ARCFOUR);
1836 krb5_error_code KRB5_LIB_FUNCTION
1837 krb5_create_checksum(krb5_context context,
1839 krb5_key_usage usage,
1845 struct checksum_type *ct = NULL;
1848 /* type 0 -> pick from crypto */
1850 ct = _find_checksum(type);
1851 } else if (crypto) {
1852 ct = crypto->et->keyed_checksum;
1854 ct = crypto->et->checksum;
1858 krb5_set_error_string (context, "checksum type %d not supported",
1860 return KRB5_PROG_SUMTYPE_NOSUPP;
1863 if (arcfour_checksum_p(ct, crypto)) {
1865 usage2arcfour(context, &keyusage);
1867 keyusage = CHECKSUM_USAGE(usage);
1869 return create_checksum(context, ct, crypto, keyusage,
1873 static krb5_error_code
1874 verify_checksum(krb5_context context,
1876 unsigned usage, /* not krb5_key_usage */
1881 krb5_error_code ret;
1882 struct key_data *dkey;
1885 struct checksum_type *ct;
1887 ct = _find_checksum(cksum->cksumtype);
1888 if (ct == NULL || (ct->flags & F_DISABLED)) {
1889 krb5_set_error_string (context, "checksum type %d not supported",
1891 return KRB5_PROG_SUMTYPE_NOSUPP;
1893 if(ct->checksumsize != cksum->checksum.length) {
1894 krb5_clear_error_string (context);
1895 return KRB5KRB_AP_ERR_BAD_INTEGRITY; /* XXX */
1897 keyed_checksum = (ct->flags & F_KEYED) != 0;
1898 if(keyed_checksum && crypto == NULL) {
1899 krb5_set_error_string (context, "Checksum type %s is keyed "
1900 "but no crypto context (key) was passed in",
1902 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
1905 ret = get_checksum_key(context, crypto, usage, ct, &dkey);
1909 return (*ct->verify)(context, dkey, data, len, usage, cksum);
1911 ret = krb5_data_alloc (&c.checksum, ct->checksumsize);
1915 (*ct->checksum)(context, dkey, data, len, usage, &c);
1917 if(c.checksum.length != cksum->checksum.length ||
1918 memcmp(c.checksum.data, cksum->checksum.data, c.checksum.length)) {
1919 krb5_clear_error_string (context);
1920 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1924 krb5_data_free (&c.checksum);
1928 krb5_error_code KRB5_LIB_FUNCTION
1929 krb5_verify_checksum(krb5_context context,
1931 krb5_key_usage usage,
1936 struct checksum_type *ct;
1939 ct = _find_checksum(cksum->cksumtype);
1941 krb5_set_error_string (context, "checksum type %d not supported",
1943 return KRB5_PROG_SUMTYPE_NOSUPP;
1946 if (arcfour_checksum_p(ct, crypto)) {
1948 usage2arcfour(context, &keyusage);
1950 keyusage = CHECKSUM_USAGE(usage);
1952 return verify_checksum(context, crypto, keyusage,
1956 krb5_error_code KRB5_LIB_FUNCTION
1957 krb5_crypto_get_checksum_type(krb5_context context,
1959 krb5_cksumtype *type)
1961 struct checksum_type *ct = NULL;
1963 if (crypto != NULL) {
1964 ct = crypto->et->keyed_checksum;
1966 ct = crypto->et->checksum;
1970 krb5_set_error_string (context, "checksum type not found");
1971 return KRB5_PROG_SUMTYPE_NOSUPP;
1980 krb5_error_code KRB5_LIB_FUNCTION
1981 krb5_checksumsize(krb5_context context,
1982 krb5_cksumtype type,
1985 struct checksum_type *ct = _find_checksum(type);
1987 krb5_set_error_string (context, "checksum type %d not supported",
1989 return KRB5_PROG_SUMTYPE_NOSUPP;
1991 *size = ct->checksumsize;
1995 krb5_boolean KRB5_LIB_FUNCTION
1996 krb5_checksum_is_keyed(krb5_context context,
1997 krb5_cksumtype type)
1999 struct checksum_type *ct = _find_checksum(type);
2002 krb5_set_error_string (context, "checksum type %d not supported",
2004 return KRB5_PROG_SUMTYPE_NOSUPP;
2006 return ct->flags & F_KEYED;
2009 krb5_boolean KRB5_LIB_FUNCTION
2010 krb5_checksum_is_collision_proof(krb5_context context,
2011 krb5_cksumtype type)
2013 struct checksum_type *ct = _find_checksum(type);
2016 krb5_set_error_string (context, "checksum type %d not supported",
2018 return KRB5_PROG_SUMTYPE_NOSUPP;
2020 return ct->flags & F_CPROOF;
2023 krb5_error_code KRB5_LIB_FUNCTION
2024 krb5_checksum_disable(krb5_context context,
2025 krb5_cksumtype type)
2027 struct checksum_type *ct = _find_checksum(type);
2030 krb5_set_error_string (context, "checksum type %d not supported",
2032 return KRB5_PROG_SUMTYPE_NOSUPP;
2034 ct->flags |= F_DISABLED;
2038 /************************************************************
2040 ************************************************************/
2042 static krb5_error_code
2043 NULL_encrypt(krb5_context context,
2044 struct key_data *key,
2047 krb5_boolean encryptp,
2054 static krb5_error_code
2055 DES_CBC_encrypt_null_ivec(krb5_context context,
2056 struct key_data *key,
2059 krb5_boolean encryptp,
2064 DES_key_schedule *s = key->schedule->data;
2065 memset(&ivec, 0, sizeof(ivec));
2066 DES_cbc_encrypt(data, data, len, s, &ivec, encryptp);
2070 static krb5_error_code
2071 DES_CBC_encrypt_key_ivec(krb5_context context,
2072 struct key_data *key,
2075 krb5_boolean encryptp,
2080 DES_key_schedule *s = key->schedule->data;
2081 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
2082 DES_cbc_encrypt(data, data, len, s, &ivec, encryptp);
2086 static krb5_error_code
2087 DES3_CBC_encrypt(krb5_context context,
2088 struct key_data *key,
2091 krb5_boolean encryptp,
2095 DES_cblock local_ivec;
2096 DES_key_schedule *s = key->schedule->data;
2099 memset(local_ivec, 0, sizeof(local_ivec));
2101 DES_ede3_cbc_encrypt(data, data, len, &s[0], &s[1], &s[2], ivec, encryptp);
2105 static krb5_error_code
2106 DES_CFB64_encrypt_null_ivec(krb5_context context,
2107 struct key_data *key,
2110 krb5_boolean encryptp,
2116 DES_key_schedule *s = key->schedule->data;
2117 memset(&ivec, 0, sizeof(ivec));
2119 DES_cfb64_encrypt(data, data, len, s, &ivec, &num, encryptp);
2123 static krb5_error_code
2124 DES_PCBC_encrypt_key_ivec(krb5_context context,
2125 struct key_data *key,
2128 krb5_boolean encryptp,
2133 DES_key_schedule *s = key->schedule->data;
2134 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
2136 DES_pcbc_encrypt(data, data, len, s, &ivec, encryptp);
2141 * AES draft-raeburn-krb-rijndael-krb-02
2144 void KRB5_LIB_FUNCTION
2145 _krb5_aes_cts_encrypt(const unsigned char *in, unsigned char *out,
2146 size_t len, const AES_KEY *key,
2147 unsigned char *ivec, const int encryptp)
2149 unsigned char tmp[AES_BLOCK_SIZE];
2153 * In the framework of kerberos, the length can never be shorter
2154 * then at least one blocksize.
2159 while(len > AES_BLOCK_SIZE) {
2160 for (i = 0; i < AES_BLOCK_SIZE; i++)
2161 tmp[i] = in[i] ^ ivec[i];
2162 AES_encrypt(tmp, out, key);
2163 memcpy(ivec, out, AES_BLOCK_SIZE);
2164 len -= AES_BLOCK_SIZE;
2165 in += AES_BLOCK_SIZE;
2166 out += AES_BLOCK_SIZE;
2169 for (i = 0; i < len; i++)
2170 tmp[i] = in[i] ^ ivec[i];
2171 for (; i < AES_BLOCK_SIZE; i++)
2172 tmp[i] = 0 ^ ivec[i];
2174 AES_encrypt(tmp, out - AES_BLOCK_SIZE, key);
2176 memcpy(out, ivec, len);
2177 memcpy(ivec, out - AES_BLOCK_SIZE, AES_BLOCK_SIZE);
2180 unsigned char tmp2[AES_BLOCK_SIZE];
2181 unsigned char tmp3[AES_BLOCK_SIZE];
2183 while(len > AES_BLOCK_SIZE * 2) {
2184 memcpy(tmp, in, AES_BLOCK_SIZE);
2185 AES_decrypt(in, out, key);
2186 for (i = 0; i < AES_BLOCK_SIZE; i++)
2188 memcpy(ivec, tmp, AES_BLOCK_SIZE);
2189 len -= AES_BLOCK_SIZE;
2190 in += AES_BLOCK_SIZE;
2191 out += AES_BLOCK_SIZE;
2194 len -= AES_BLOCK_SIZE;
2196 memcpy(tmp, in, AES_BLOCK_SIZE); /* save last iv */
2197 AES_decrypt(in, tmp2, key);
2199 memcpy(tmp3, in + AES_BLOCK_SIZE, len);
2200 memcpy(tmp3 + len, tmp2 + len, AES_BLOCK_SIZE - len); /* xor 0 */
2202 for (i = 0; i < len; i++)
2203 out[i + AES_BLOCK_SIZE] = tmp2[i] ^ tmp3[i];
2205 AES_decrypt(tmp3, out, key);
2206 for (i = 0; i < AES_BLOCK_SIZE; i++)
2208 memcpy(ivec, tmp, AES_BLOCK_SIZE);
2212 static krb5_error_code
2213 AES_CTS_encrypt(krb5_context context,
2214 struct key_data *key,
2217 krb5_boolean encryptp,
2221 struct krb5_aes_schedule *aeskey = key->schedule->data;
2222 char local_ivec[AES_BLOCK_SIZE];
2230 if (len < AES_BLOCK_SIZE)
2231 krb5_abortx(context, "invalid use of AES_CTS_encrypt");
2232 if (len == AES_BLOCK_SIZE) {
2234 AES_encrypt(data, data, k);
2236 AES_decrypt(data, data, k);
2239 memset(local_ivec, 0, sizeof(local_ivec));
2242 _krb5_aes_cts_encrypt(data, data, len, k, ivec, encryptp);
2249 * section 6 of draft-brezak-win2k-krb-rc4-hmac-03
2251 * warning: not for small children
2254 static krb5_error_code
2255 ARCFOUR_subencrypt(krb5_context context,
2256 struct key_data *key,
2262 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
2263 Checksum k1_c, k2_c, k3_c, cksum;
2268 unsigned char *cdata = data;
2269 unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
2270 krb5_error_code ret;
2272 t[0] = (usage >> 0) & 0xFF;
2273 t[1] = (usage >> 8) & 0xFF;
2274 t[2] = (usage >> 16) & 0xFF;
2275 t[3] = (usage >> 24) & 0xFF;
2277 k1_c.checksum.length = sizeof(k1_c_data);
2278 k1_c.checksum.data = k1_c_data;
2280 ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
2282 krb5_abortx(context, "hmac failed");
2284 memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
2286 k2_c.checksum.length = sizeof(k2_c_data);
2287 k2_c.checksum.data = k2_c_data;
2290 kb.keyvalue = k2_c.checksum;
2292 cksum.checksum.length = 16;
2293 cksum.checksum.data = data;
2295 ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
2297 krb5_abortx(context, "hmac failed");
2300 kb.keyvalue = k1_c.checksum;
2302 k3_c.checksum.length = sizeof(k3_c_data);
2303 k3_c.checksum.data = k3_c_data;
2305 ret = hmac(NULL, c, data, 16, 0, &ke, &k3_c);
2307 krb5_abortx(context, "hmac failed");
2309 RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data);
2310 RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16);
2311 memset (k1_c_data, 0, sizeof(k1_c_data));
2312 memset (k2_c_data, 0, sizeof(k2_c_data));
2313 memset (k3_c_data, 0, sizeof(k3_c_data));
2317 static krb5_error_code
2318 ARCFOUR_subdecrypt(krb5_context context,
2319 struct key_data *key,
2325 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
2326 Checksum k1_c, k2_c, k3_c, cksum;
2331 unsigned char *cdata = data;
2332 unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
2333 unsigned char cksum_data[16];
2334 krb5_error_code ret;
2336 t[0] = (usage >> 0) & 0xFF;
2337 t[1] = (usage >> 8) & 0xFF;
2338 t[2] = (usage >> 16) & 0xFF;
2339 t[3] = (usage >> 24) & 0xFF;
2341 k1_c.checksum.length = sizeof(k1_c_data);
2342 k1_c.checksum.data = k1_c_data;
2344 ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
2346 krb5_abortx(context, "hmac failed");
2348 memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
2350 k2_c.checksum.length = sizeof(k2_c_data);
2351 k2_c.checksum.data = k2_c_data;
2354 kb.keyvalue = k1_c.checksum;
2356 k3_c.checksum.length = sizeof(k3_c_data);
2357 k3_c.checksum.data = k3_c_data;
2359 ret = hmac(NULL, c, cdata, 16, 0, &ke, &k3_c);
2361 krb5_abortx(context, "hmac failed");
2363 RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data);
2364 RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16);
2367 kb.keyvalue = k2_c.checksum;
2369 cksum.checksum.length = 16;
2370 cksum.checksum.data = cksum_data;
2372 ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
2374 krb5_abortx(context, "hmac failed");
2376 memset (k1_c_data, 0, sizeof(k1_c_data));
2377 memset (k2_c_data, 0, sizeof(k2_c_data));
2378 memset (k3_c_data, 0, sizeof(k3_c_data));
2380 if (memcmp (cksum.checksum.data, data, 16) != 0) {
2381 krb5_clear_error_string (context);
2382 return KRB5KRB_AP_ERR_BAD_INTEGRITY;
2389 * convert the usage numbers used in
2390 * draft-ietf-cat-kerb-key-derivation-00.txt to the ones in
2391 * draft-brezak-win2k-krb-rc4-hmac-04.txt
2394 static krb5_error_code
2395 usage2arcfour (krb5_context context, unsigned *usage)
2398 case KRB5_KU_AS_REP_ENC_PART : /* 3 */
2399 case KRB5_KU_TGS_REP_ENC_PART_SUB_KEY : /* 9 */
2402 case KRB5_KU_USAGE_SEAL : /* 22 */
2405 case KRB5_KU_USAGE_SIGN : /* 23 */
2408 case KRB5_KU_USAGE_SEQ: /* 24 */
2416 static krb5_error_code
2417 ARCFOUR_encrypt(krb5_context context,
2418 struct key_data *key,
2421 krb5_boolean encryptp,
2425 krb5_error_code ret;
2426 unsigned keyusage = usage;
2428 if((ret = usage2arcfour (context, &keyusage)) != 0)
2432 return ARCFOUR_subencrypt (context, key, data, len, keyusage, ivec);
2434 return ARCFOUR_subdecrypt (context, key, data, len, keyusage, ivec);
2439 * these should currently be in reverse preference order.
2440 * (only relevant for !F_PSEUDO) */
2442 static struct encryption_type enctype_null = {
2455 static struct encryption_type enctype_des_cbc_crc = {
2466 DES_CBC_encrypt_key_ivec,
2468 static struct encryption_type enctype_des_cbc_md4 = {
2477 &checksum_rsa_md4_des,
2479 DES_CBC_encrypt_null_ivec,
2481 static struct encryption_type enctype_des_cbc_md5 = {
2490 &checksum_rsa_md5_des,
2492 DES_CBC_encrypt_null_ivec,
2494 static struct encryption_type enctype_arcfour_hmac_md5 = {
2495 ETYPE_ARCFOUR_HMAC_MD5,
2507 static struct encryption_type enctype_des3_cbc_md5 = {
2516 &checksum_rsa_md5_des3,
2520 static struct encryption_type enctype_des3_cbc_sha1 = {
2521 ETYPE_DES3_CBC_SHA1,
2527 &keytype_des3_derived,
2529 &checksum_hmac_sha1_des3,
2533 static struct encryption_type enctype_old_des3_cbc_sha1 = {
2534 ETYPE_OLD_DES3_CBC_SHA1,
2535 "old-des3-cbc-sha1",
2542 &checksum_hmac_sha1_des3,
2546 static struct encryption_type enctype_aes128_cts_hmac_sha1 = {
2547 ETYPE_AES128_CTS_HMAC_SHA1_96,
2548 "aes128-cts-hmac-sha1-96",
2555 &checksum_hmac_sha1_aes128,
2559 static struct encryption_type enctype_aes256_cts_hmac_sha1 = {
2560 ETYPE_AES256_CTS_HMAC_SHA1_96,
2561 "aes256-cts-hmac-sha1-96",
2568 &checksum_hmac_sha1_aes256,
2572 static struct encryption_type enctype_des_cbc_none = {
2583 DES_CBC_encrypt_null_ivec,
2585 static struct encryption_type enctype_des_cfb64_none = {
2586 ETYPE_DES_CFB64_NONE,
2596 DES_CFB64_encrypt_null_ivec,
2598 static struct encryption_type enctype_des_pcbc_none = {
2599 ETYPE_DES_PCBC_NONE,
2609 DES_PCBC_encrypt_key_ivec,
2611 static struct encryption_type enctype_des3_cbc_none = {
2612 ETYPE_DES3_CBC_NONE,
2618 &keytype_des3_derived,
2625 static struct encryption_type *etypes[] = {
2627 &enctype_des_cbc_crc,
2628 &enctype_des_cbc_md4,
2629 &enctype_des_cbc_md5,
2630 &enctype_arcfour_hmac_md5,
2631 &enctype_des3_cbc_md5,
2632 &enctype_des3_cbc_sha1,
2633 &enctype_old_des3_cbc_sha1,
2634 &enctype_aes128_cts_hmac_sha1,
2635 &enctype_aes256_cts_hmac_sha1,
2636 &enctype_des_cbc_none,
2637 &enctype_des_cfb64_none,
2638 &enctype_des_pcbc_none,
2639 &enctype_des3_cbc_none
2642 static unsigned num_etypes = sizeof(etypes) / sizeof(etypes[0]);
2645 static struct encryption_type *
2646 _find_enctype(krb5_enctype type)
2649 for(i = 0; i < num_etypes; i++)
2650 if(etypes[i]->type == type)
2656 krb5_error_code KRB5_LIB_FUNCTION
2657 krb5_enctype_to_string(krb5_context context,
2661 struct encryption_type *e;
2662 e = _find_enctype(etype);
2664 krb5_set_error_string (context, "encryption type %d not supported",
2666 return KRB5_PROG_ETYPE_NOSUPP;
2668 *string = strdup(e->name);
2669 if(*string == NULL) {
2670 krb5_set_error_string(context, "malloc: out of memory");
2676 krb5_error_code KRB5_LIB_FUNCTION
2677 krb5_string_to_enctype(krb5_context context,
2679 krb5_enctype *etype)
2682 for(i = 0; i < num_etypes; i++)
2683 if(strcasecmp(etypes[i]->name, string) == 0){
2684 *etype = etypes[i]->type;
2687 krb5_set_error_string (context, "encryption type %s not supported",
2689 return KRB5_PROG_ETYPE_NOSUPP;
2692 krb5_error_code KRB5_LIB_FUNCTION
2693 _krb5_enctype_to_oid(krb5_context context,
2697 struct encryption_type *et = _find_enctype(etype);
2699 krb5_set_error_string (context, "encryption type %d not supported",
2701 return KRB5_PROG_ETYPE_NOSUPP;
2703 if(et->oid == NULL) {
2704 krb5_set_error_string (context, "%s have not oid", et->name);
2705 return KRB5_PROG_ETYPE_NOSUPP;
2707 krb5_clear_error_string(context);
2708 return der_copy_oid(et->oid, oid);
2711 krb5_error_code KRB5_LIB_FUNCTION
2712 _krb5_oid_to_enctype(krb5_context context,
2713 const heim_oid *oid,
2714 krb5_enctype *etype)
2717 for(i = 0; i < num_etypes; i++) {
2718 if(etypes[i]->oid && der_heim_oid_cmp(etypes[i]->oid, oid) == 0) {
2719 *etype = etypes[i]->type;
2723 krb5_set_error_string(context, "enctype for oid not supported");
2724 return KRB5_PROG_ETYPE_NOSUPP;
2727 krb5_error_code KRB5_LIB_FUNCTION
2728 krb5_enctype_to_keytype(krb5_context context,
2730 krb5_keytype *keytype)
2732 struct encryption_type *e = _find_enctype(etype);
2734 krb5_set_error_string (context, "encryption type %d not supported",
2736 return KRB5_PROG_ETYPE_NOSUPP;
2738 *keytype = e->keytype->type; /* XXX */
2743 krb5_error_code KRB5_LIB_FUNCTION
2744 krb5_keytype_to_enctype(krb5_context context,
2745 krb5_keytype keytype,
2746 krb5_enctype *etype)
2748 struct key_type *kt = _find_keytype(keytype);
2749 krb5_warnx(context, "krb5_keytype_to_enctype(%u)", keytype);
2751 return KRB5_PROG_KEYTYPE_NOSUPP;
2752 *etype = kt->best_etype;
2757 krb5_error_code KRB5_LIB_FUNCTION
2758 krb5_keytype_to_enctypes (krb5_context context,
2759 krb5_keytype keytype,
2767 for (i = num_etypes - 1; i >= 0; --i) {
2768 if (etypes[i]->keytype->type == keytype
2769 && !(etypes[i]->flags & F_PSEUDO))
2772 ret = malloc(n * sizeof(*ret));
2773 if (ret == NULL && n != 0) {
2774 krb5_set_error_string(context, "malloc: out of memory");
2778 for (i = num_etypes - 1; i >= 0; --i) {
2779 if (etypes[i]->keytype->type == keytype
2780 && !(etypes[i]->flags & F_PSEUDO))
2781 ret[n++] = etypes[i]->type;
2789 * First take the configured list of etypes for `keytype' if available,
2790 * else, do `krb5_keytype_to_enctypes'.
2793 krb5_error_code KRB5_LIB_FUNCTION
2794 krb5_keytype_to_enctypes_default (krb5_context context,
2795 krb5_keytype keytype,
2802 if (keytype != KEYTYPE_DES || context->etypes_des == NULL)
2803 return krb5_keytype_to_enctypes (context, keytype, len, val);
2805 for (n = 0; context->etypes_des[n]; ++n)
2807 ret = malloc (n * sizeof(*ret));
2808 if (ret == NULL && n != 0) {
2809 krb5_set_error_string(context, "malloc: out of memory");
2812 for (i = 0; i < n; ++i)
2813 ret[i] = context->etypes_des[i];
2819 krb5_error_code KRB5_LIB_FUNCTION
2820 krb5_enctype_valid(krb5_context context,
2823 struct encryption_type *e = _find_enctype(etype);
2825 krb5_set_error_string (context, "encryption type %d not supported",
2827 return KRB5_PROG_ETYPE_NOSUPP;
2829 if (e->flags & F_DISABLED) {
2830 krb5_set_error_string (context, "encryption type %s is disabled",
2832 return KRB5_PROG_ETYPE_NOSUPP;
2837 krb5_error_code KRB5_LIB_FUNCTION
2838 krb5_cksumtype_valid(krb5_context context,
2839 krb5_cksumtype ctype)
2841 struct checksum_type *c = _find_checksum(ctype);
2843 krb5_set_error_string (context, "checksum type %d not supported",
2845 return KRB5_PROG_SUMTYPE_NOSUPP;
2847 if (c->flags & F_DISABLED) {
2848 krb5_set_error_string (context, "checksum type %s is disabled",
2850 return KRB5_PROG_SUMTYPE_NOSUPP;
2856 /* if two enctypes have compatible keys */
2857 krb5_boolean KRB5_LIB_FUNCTION
2858 krb5_enctypes_compatible_keys(krb5_context context,
2859 krb5_enctype etype1,
2860 krb5_enctype etype2)
2862 struct encryption_type *e1 = _find_enctype(etype1);
2863 struct encryption_type *e2 = _find_enctype(etype2);
2864 return e1 != NULL && e2 != NULL && e1->keytype == e2->keytype;
2868 derived_crypto(krb5_context context,
2871 return (crypto->et->flags & F_DERIVED) != 0;
2875 special_crypto(krb5_context context,
2878 return (crypto->et->flags & F_SPECIAL) != 0;
2881 #define CHECKSUMSIZE(C) ((C)->checksumsize)
2882 #define CHECKSUMTYPE(C) ((C)->type)
2884 static krb5_error_code
2885 encrypt_internal_derived(krb5_context context,
2893 size_t sz, block_sz, checksum_sz, total_sz;
2895 unsigned char *p, *q;
2896 krb5_error_code ret;
2897 struct key_data *dkey;
2898 const struct encryption_type *et = crypto->et;
2900 checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
2902 sz = et->confoundersize + len;
2903 block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
2904 total_sz = block_sz + checksum_sz;
2905 p = calloc(1, total_sz);
2907 krb5_set_error_string(context, "malloc: out of memory");
2912 krb5_generate_random_block(q, et->confoundersize); /* XXX */
2913 q += et->confoundersize;
2914 memcpy(q, data, len);
2916 ret = create_checksum(context,
2919 INTEGRITY_USAGE(usage),
2923 if(ret == 0 && cksum.checksum.length != checksum_sz) {
2924 free_Checksum (&cksum);
2925 krb5_clear_error_string (context);
2926 ret = KRB5_CRYPTO_INTERNAL;
2930 memcpy(p + block_sz, cksum.checksum.data, cksum.checksum.length);
2931 free_Checksum (&cksum);
2932 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
2935 ret = _key_schedule(context, dkey);
2939 krb5_crypto_debug(context, 1, block_sz, dkey->key);
2941 ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec);
2945 result->length = total_sz;
2948 memset(p, 0, total_sz);
2954 static krb5_error_code
2955 encrypt_internal(krb5_context context,
2962 size_t sz, block_sz, checksum_sz;
2964 unsigned char *p, *q;
2965 krb5_error_code ret;
2966 const struct encryption_type *et = crypto->et;
2968 checksum_sz = CHECKSUMSIZE(et->checksum);
2970 sz = et->confoundersize + checksum_sz + len;
2971 block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
2972 p = calloc(1, block_sz);
2974 krb5_set_error_string(context, "malloc: out of memory");
2979 krb5_generate_random_block(q, et->confoundersize); /* XXX */
2980 q += et->confoundersize;
2981 memset(q, 0, checksum_sz);
2983 memcpy(q, data, len);
2985 ret = create_checksum(context,
2992 if(ret == 0 && cksum.checksum.length != checksum_sz) {
2993 krb5_clear_error_string (context);
2994 free_Checksum(&cksum);
2995 ret = KRB5_CRYPTO_INTERNAL;
2999 memcpy(p + et->confoundersize, cksum.checksum.data, cksum.checksum.length);
3000 free_Checksum(&cksum);
3001 ret = _key_schedule(context, &crypto->key);
3005 krb5_crypto_debug(context, 1, block_sz, crypto->key.key);
3007 ret = (*et->encrypt)(context, &crypto->key, p, block_sz, 1, 0, ivec);
3009 memset(p, 0, block_sz);
3014 result->length = block_sz;
3017 memset(p, 0, block_sz);
3022 static krb5_error_code
3023 encrypt_internal_special(krb5_context context,
3031 struct encryption_type *et = crypto->et;
3032 size_t cksum_sz = CHECKSUMSIZE(et->checksum);
3033 size_t sz = len + cksum_sz + et->confoundersize;
3035 krb5_error_code ret;
3039 krb5_set_error_string(context, "malloc: out of memory");
3043 memset (p, 0, cksum_sz);
3045 krb5_generate_random_block(p, et->confoundersize);
3046 p += et->confoundersize;
3047 memcpy (p, data, len);
3048 ret = (*et->encrypt)(context, &crypto->key, tmp, sz, TRUE, usage, ivec);
3055 result->length = sz;
3059 static krb5_error_code
3060 decrypt_internal_derived(krb5_context context,
3071 krb5_error_code ret;
3072 struct key_data *dkey;
3073 struct encryption_type *et = crypto->et;
3076 checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
3077 if (len < checksum_sz) {
3078 krb5_clear_error_string (context);
3079 return EINVAL; /* XXX - better error code? */
3082 if (((len - checksum_sz) % et->padsize) != 0) {
3083 krb5_clear_error_string(context);
3084 return KRB5_BAD_MSIZE;
3088 if(len != 0 && p == NULL) {
3089 krb5_set_error_string(context, "malloc: out of memory");
3092 memcpy(p, data, len);
3096 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
3101 ret = _key_schedule(context, dkey);
3107 krb5_crypto_debug(context, 0, len, dkey->key);
3109 ret = (*et->encrypt)(context, dkey, p, len, 0, usage, ivec);
3115 cksum.checksum.data = p + len;
3116 cksum.checksum.length = checksum_sz;
3117 cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
3119 ret = verify_checksum(context,
3121 INTEGRITY_USAGE(usage),
3129 l = len - et->confoundersize;
3130 memmove(p, p + et->confoundersize, l);
3131 result->data = realloc(p, l);
3132 if(result->data == NULL && l != 0) {
3134 krb5_set_error_string(context, "malloc: out of memory");
3141 static krb5_error_code
3142 decrypt_internal(krb5_context context,
3149 krb5_error_code ret;
3152 size_t checksum_sz, l;
3153 struct encryption_type *et = crypto->et;
3155 if ((len % et->padsize) != 0) {
3156 krb5_clear_error_string(context);
3157 return KRB5_BAD_MSIZE;
3160 checksum_sz = CHECKSUMSIZE(et->checksum);
3162 if(len != 0 && p == NULL) {
3163 krb5_set_error_string(context, "malloc: out of memory");
3166 memcpy(p, data, len);
3168 ret = _key_schedule(context, &crypto->key);
3174 krb5_crypto_debug(context, 0, len, crypto->key.key);
3176 ret = (*et->encrypt)(context, &crypto->key, p, len, 0, 0, ivec);
3181 ret = krb5_data_copy(&cksum.checksum, p + et->confoundersize, checksum_sz);
3186 memset(p + et->confoundersize, 0, checksum_sz);
3187 cksum.cksumtype = CHECKSUMTYPE(et->checksum);
3188 ret = verify_checksum(context, NULL, 0, p, len, &cksum);
3189 free_Checksum(&cksum);
3194 l = len - et->confoundersize - checksum_sz;
3195 memmove(p, p + et->confoundersize + checksum_sz, l);
3196 result->data = realloc(p, l);
3197 if(result->data == NULL && l != 0) {
3199 krb5_set_error_string(context, "malloc: out of memory");
3206 static krb5_error_code
3207 decrypt_internal_special(krb5_context context,
3215 struct encryption_type *et = crypto->et;
3216 size_t cksum_sz = CHECKSUMSIZE(et->checksum);
3217 size_t sz = len - cksum_sz - et->confoundersize;
3219 krb5_error_code ret;
3221 if ((len % et->padsize) != 0) {
3222 krb5_clear_error_string(context);
3223 return KRB5_BAD_MSIZE;
3228 krb5_set_error_string(context, "malloc: out of memory");
3231 memcpy(p, data, len);
3233 ret = (*et->encrypt)(context, &crypto->key, p, len, FALSE, usage, ivec);
3239 memmove (p, p + cksum_sz + et->confoundersize, sz);
3240 result->data = realloc(p, sz);
3241 if(result->data == NULL && sz != 0) {
3243 krb5_set_error_string(context, "malloc: out of memory");
3246 result->length = sz;
3251 krb5_error_code KRB5_LIB_FUNCTION
3252 krb5_encrypt_ivec(krb5_context context,
3260 if(derived_crypto(context, crypto))
3261 return encrypt_internal_derived(context, crypto, usage,
3262 data, len, result, ivec);
3263 else if (special_crypto(context, crypto))
3264 return encrypt_internal_special (context, crypto, usage,
3265 data, len, result, ivec);
3267 return encrypt_internal(context, crypto, data, len, result, ivec);
3270 krb5_error_code KRB5_LIB_FUNCTION
3271 krb5_encrypt(krb5_context context,
3278 return krb5_encrypt_ivec(context, crypto, usage, data, len, result, NULL);
3281 krb5_error_code KRB5_LIB_FUNCTION
3282 krb5_encrypt_EncryptedData(krb5_context context,
3288 EncryptedData *result)
3290 result->etype = CRYPTO_ETYPE(crypto);
3292 ALLOC(result->kvno, 1);
3293 *result->kvno = kvno;
3295 result->kvno = NULL;
3296 return krb5_encrypt(context, crypto, usage, data, len, &result->cipher);
3299 krb5_error_code KRB5_LIB_FUNCTION
3300 krb5_decrypt_ivec(krb5_context context,
3308 if(derived_crypto(context, crypto))
3309 return decrypt_internal_derived(context, crypto, usage,
3310 data, len, result, ivec);
3311 else if (special_crypto (context, crypto))
3312 return decrypt_internal_special(context, crypto, usage,
3313 data, len, result, ivec);
3315 return decrypt_internal(context, crypto, data, len, result, ivec);
3318 krb5_error_code KRB5_LIB_FUNCTION
3319 krb5_decrypt(krb5_context context,
3326 return krb5_decrypt_ivec (context, crypto, usage, data, len, result,
3330 krb5_error_code KRB5_LIB_FUNCTION
3331 krb5_decrypt_EncryptedData(krb5_context context,
3334 const EncryptedData *e,
3337 return krb5_decrypt(context, crypto, usage,
3338 e->cipher.data, e->cipher.length, result);
3341 /************************************************************
3343 ************************************************************/
3346 #include <openssl/rand.h>
3348 /* From openssl/crypto/rand/rand_lcl.h */
3349 #define ENTROPY_NEEDED 20
3351 seed_something(void)
3353 char buf[1024], seedfile[256];
3355 /* If there is a seed file, load it. But such a file cannot be trusted,
3356 so use 0 for the entropy estimate */
3357 if (RAND_file_name(seedfile, sizeof(seedfile))) {
3359 fd = open(seedfile, O_RDONLY);
3362 ret = read(fd, buf, sizeof(buf));
3364 RAND_add(buf, ret, 0.0);
3371 /* Calling RAND_status() will try to use /dev/urandom if it exists so
3372 we do not have to deal with it. */
3373 if (RAND_status() != 1) {
3374 krb5_context context;
3378 if (!krb5_init_context(&context)) {
3379 p = krb5_config_get_string(context, NULL, "libdefaults",
3380 "egd_socket", NULL);
3382 RAND_egd_bytes(p, ENTROPY_NEEDED);
3383 krb5_free_context(context);
3387 if (RAND_status() == 1) {
3388 /* Update the seed file */
3390 RAND_write_file(seedfile);
3397 void KRB5_LIB_FUNCTION
3398 krb5_generate_random_block(void *buf, size_t len)
3400 static int rng_initialized = 0;
3402 HEIMDAL_MUTEX_lock(&crypto_mutex);
3403 if (!rng_initialized) {
3404 if (seed_something())
3405 krb5_abortx(NULL, "Fatal: could not seed the random number generator");
3407 rng_initialized = 1;
3409 HEIMDAL_MUTEX_unlock(&crypto_mutex);
3410 if (RAND_bytes(buf, len) != 1)
3411 krb5_abortx(NULL, "Failed to generate random block");
3416 void KRB5_LIB_FUNCTION
3417 krb5_generate_random_block(void *buf, size_t len)
3419 DES_cblock key, out;
3420 static DES_cblock counter;
3421 static DES_key_schedule schedule;
3423 static int initialized = 0;
3425 HEIMDAL_MUTEX_lock(&crypto_mutex);
3427 DES_new_random_key(&key);
3428 DES_set_key(&key, &schedule);
3429 memset(&key, 0, sizeof(key));
3430 DES_new_random_key(&counter);
3433 HEIMDAL_MUTEX_unlock(&crypto_mutex);
3435 DES_ecb_encrypt(&counter, &out, &schedule, DES_ENCRYPT);
3436 for(i = 7; i >=0; i--)
3439 memcpy(buf, out, min(len, sizeof(out)));
3440 len -= min(len, sizeof(out));
3441 buf = (char*)buf + sizeof(out);
3447 DES3_postproc(krb5_context context,
3448 unsigned char *k, size_t len, struct key_data *key)
3450 DES3_random_to_key(context, key->key, k, len);
3452 if (key->schedule) {
3453 krb5_free_data(context, key->schedule);
3454 key->schedule = NULL;
3458 static krb5_error_code
3459 derive_key(krb5_context context,
3460 struct encryption_type *et,
3461 struct key_data *key,
3462 const void *constant,
3466 unsigned int nblocks = 0, i;
3467 krb5_error_code ret = 0;
3468 struct key_type *kt = et->keytype;
3470 ret = _key_schedule(context, key);
3473 if(et->blocksize * 8 < kt->bits ||
3474 len != et->blocksize) {
3475 nblocks = (kt->bits + et->blocksize * 8 - 1) / (et->blocksize * 8);
3476 k = malloc(nblocks * et->blocksize);
3478 krb5_set_error_string(context, "malloc: out of memory");
3481 _krb5_n_fold(constant, len, k, et->blocksize);
3482 for(i = 0; i < nblocks; i++) {
3484 memcpy(k + i * et->blocksize,
3485 k + (i - 1) * et->blocksize,
3487 (*et->encrypt)(context, key, k + i * et->blocksize, et->blocksize,
3491 /* this case is probably broken, but won't be run anyway */
3492 void *c = malloc(len);
3493 size_t res_len = (kt->bits + 7) / 8;
3495 if(len != 0 && c == NULL) {
3496 krb5_set_error_string(context, "malloc: out of memory");
3499 memcpy(c, constant, len);
3500 (*et->encrypt)(context, key, c, len, 1, 0, NULL);
3501 k = malloc(res_len);
3502 if(res_len != 0 && k == NULL) {
3504 krb5_set_error_string(context, "malloc: out of memory");
3507 _krb5_n_fold(c, len, k, res_len);
3511 /* XXX keytype dependent post-processing */
3514 DES3_postproc(context, k, nblocks * et->blocksize, key);
3516 case KEYTYPE_AES128:
3517 case KEYTYPE_AES256:
3518 memcpy(key->key->keyvalue.data, k, key->key->keyvalue.length);
3521 krb5_set_error_string(context,
3522 "derive_key() called with unknown keytype (%u)",
3524 ret = KRB5_CRYPTO_INTERNAL;
3527 if (key->schedule) {
3528 krb5_free_data(context, key->schedule);
3529 key->schedule = NULL;
3531 memset(k, 0, nblocks * et->blocksize);
3536 static struct key_data *
3537 _new_derived_key(krb5_crypto crypto, unsigned usage)
3539 struct key_usage *d = crypto->key_usage;
3540 d = realloc(d, (crypto->num_key_usage + 1) * sizeof(*d));
3543 crypto->key_usage = d;
3544 d += crypto->num_key_usage++;
3545 memset(d, 0, sizeof(*d));
3550 krb5_error_code KRB5_LIB_FUNCTION
3551 krb5_derive_key(krb5_context context,
3552 const krb5_keyblock *key,
3554 const void *constant,
3555 size_t constant_len,
3556 krb5_keyblock **derived_key)
3558 krb5_error_code ret;
3559 struct encryption_type *et;
3562 *derived_key = NULL;
3564 et = _find_enctype (etype);
3566 krb5_set_error_string(context, "encryption type %d not supported",
3568 return KRB5_PROG_ETYPE_NOSUPP;
3571 ret = krb5_copy_keyblock(context, key, &d.key);
3576 ret = derive_key(context, et, &d, constant, constant_len);
3578 ret = krb5_copy_keyblock(context, d.key, derived_key);
3579 free_key_data(context, &d);
3583 static krb5_error_code
3584 _get_derived_key(krb5_context context,
3587 struct key_data **key)
3591 unsigned char constant[5];
3593 for(i = 0; i < crypto->num_key_usage; i++)
3594 if(crypto->key_usage[i].usage == usage) {
3595 *key = &crypto->key_usage[i].key;
3598 d = _new_derived_key(crypto, usage);
3600 krb5_set_error_string(context, "malloc: out of memory");
3603 krb5_copy_keyblock(context, crypto->key.key, &d->key);
3604 _krb5_put_int(constant, usage, 5);
3605 derive_key(context, crypto->et, d, constant, sizeof(constant));
3611 krb5_error_code KRB5_LIB_FUNCTION
3612 krb5_crypto_init(krb5_context context,
3613 const krb5_keyblock *key,
3615 krb5_crypto *crypto)
3617 krb5_error_code ret;
3619 if(*crypto == NULL) {
3620 krb5_set_error_string(context, "malloc: out of memory");
3623 if(etype == ETYPE_NULL)
3624 etype = key->keytype;
3625 (*crypto)->et = _find_enctype(etype);
3626 if((*crypto)->et == NULL || ((*crypto)->et->flags & F_DISABLED)) {
3629 krb5_set_error_string (context, "encryption type %d not supported",
3631 return KRB5_PROG_ETYPE_NOSUPP;
3633 if((*crypto)->et->keytype->minsize > key->keyvalue.length) {
3636 krb5_set_error_string (context, "encryption key has bad length");
3637 return KRB5_BAD_KEYSIZE;
3639 ret = krb5_copy_keyblock(context, key, &(*crypto)->key.key);
3645 (*crypto)->key.schedule = NULL;
3646 (*crypto)->num_key_usage = 0;
3647 (*crypto)->key_usage = NULL;
3652 free_key_data(krb5_context context, struct key_data *key)
3654 krb5_free_keyblock(context, key->key);
3656 memset(key->schedule->data, 0, key->schedule->length);
3657 krb5_free_data(context, key->schedule);
3662 free_key_usage(krb5_context context, struct key_usage *ku)
3664 free_key_data(context, &ku->key);
3667 krb5_error_code KRB5_LIB_FUNCTION
3668 krb5_crypto_destroy(krb5_context context,
3673 for(i = 0; i < crypto->num_key_usage; i++)
3674 free_key_usage(context, &crypto->key_usage[i]);
3675 free(crypto->key_usage);
3676 free_key_data(context, &crypto->key);
3681 krb5_error_code KRB5_LIB_FUNCTION
3682 krb5_crypto_getblocksize(krb5_context context,
3686 *blocksize = crypto->et->blocksize;
3690 krb5_error_code KRB5_LIB_FUNCTION
3691 krb5_crypto_getenctype(krb5_context context,
3693 krb5_enctype *enctype)
3695 *enctype = crypto->et->type;
3699 krb5_error_code KRB5_LIB_FUNCTION
3700 krb5_crypto_getpadsize(krb5_context context,
3704 *padsize = crypto->et->padsize;
3708 krb5_error_code KRB5_LIB_FUNCTION
3709 krb5_crypto_getconfoundersize(krb5_context context,
3711 size_t *confoundersize)
3713 *confoundersize = crypto->et->confoundersize;
3717 krb5_error_code KRB5_LIB_FUNCTION
3718 krb5_enctype_disable(krb5_context context,
3719 krb5_enctype enctype)
3721 struct encryption_type *et = _find_enctype(enctype);
3724 krb5_set_error_string (context, "encryption type %d not supported",
3726 return KRB5_PROG_ETYPE_NOSUPP;
3728 et->flags |= F_DISABLED;
3732 krb5_error_code KRB5_LIB_FUNCTION
3733 krb5_string_to_key_derived(krb5_context context,
3739 struct encryption_type *et = _find_enctype(etype);
3740 krb5_error_code ret;
3746 krb5_set_error_string (context, "encryption type %d not supported",
3748 return KRB5_PROG_ETYPE_NOSUPP;
3750 keylen = et->keytype->bits / 8;
3753 if(kd.key == NULL) {
3754 krb5_set_error_string (context, "malloc: out of memory");
3757 ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
3762 kd.key->keytype = etype;
3763 tmp = malloc (keylen);
3765 krb5_free_keyblock(context, kd.key);
3766 krb5_set_error_string (context, "malloc: out of memory");
3769 _krb5_n_fold(str, len, tmp, keylen);
3771 DES3_postproc (context, tmp, keylen, &kd); /* XXX */
3772 memset(tmp, 0, keylen);
3774 ret = derive_key(context,
3777 "kerberos", /* XXX well known constant */
3778 strlen("kerberos"));
3779 ret = krb5_copy_keyblock_contents(context, kd.key, key);
3780 free_key_data(context, &kd);
3785 wrapped_length (krb5_context context,
3789 struct encryption_type *et = crypto->et;
3790 size_t padsize = et->padsize;
3791 size_t checksumsize = CHECKSUMSIZE(et->checksum);
3794 res = et->confoundersize + checksumsize + data_len;
3795 res = (res + padsize - 1) / padsize * padsize;
3800 wrapped_length_dervied (krb5_context context,
3804 struct encryption_type *et = crypto->et;
3805 size_t padsize = et->padsize;
3808 res = et->confoundersize + data_len;
3809 res = (res + padsize - 1) / padsize * padsize;
3810 if (et->keyed_checksum)
3811 res += et->keyed_checksum->checksumsize;
3813 res += et->checksum->checksumsize;
3818 * Return the size of an encrypted packet of length `data_len'
3822 krb5_get_wrapped_length (krb5_context context,
3826 if (derived_crypto (context, crypto))
3827 return wrapped_length_dervied (context, crypto, data_len);
3829 return wrapped_length (context, crypto, data_len);
3832 krb5_error_code KRB5_LIB_FUNCTION
3833 krb5_random_to_key(krb5_context context,
3839 krb5_error_code ret;
3840 struct encryption_type *et = _find_enctype(type);
3842 krb5_set_error_string(context, "encryption type %d not supported",
3844 return KRB5_PROG_ETYPE_NOSUPP;
3846 if ((et->keytype->bits + 7) / 8 > size) {
3847 krb5_set_error_string(context, "encryption key %s needs %d bytes "
3848 "of random to make an encryption key out of it",
3849 et->name, (int)et->keytype->size);
3850 return KRB5_PROG_ETYPE_NOSUPP;
3852 ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
3855 key->keytype = type;
3856 if (et->keytype->random_to_key)
3857 (*et->keytype->random_to_key)(context, key, data, size);
3859 memcpy(key->keyvalue.data, data, et->keytype->size);
3865 _krb5_pk_octetstring2key(krb5_context context,
3869 const heim_octet_string *c_n,
3870 const heim_octet_string *k_n,
3873 struct encryption_type *et = _find_enctype(type);
3874 krb5_error_code ret;
3875 size_t keylen, offset;
3877 unsigned char counter;
3878 unsigned char shaoutput[20];
3881 krb5_set_error_string(context, "encryption type %d not supported",
3883 return KRB5_PROG_ETYPE_NOSUPP;
3885 keylen = (et->keytype->bits + 7) / 8;
3887 keydata = malloc(keylen);
3888 if (keydata == NULL) {
3889 krb5_set_error_string(context, "malloc: out of memory");
3899 SHA1_Update(&m, &counter, 1);
3900 SHA1_Update(&m, dhdata, dhsize);
3902 SHA1_Update(&m, c_n->data, c_n->length);
3904 SHA1_Update(&m, k_n->data, k_n->length);
3905 SHA1_Final(shaoutput, &m);
3907 memcpy((unsigned char *)keydata + offset,
3909 min(keylen - offset, sizeof(shaoutput)));
3911 offset += sizeof(shaoutput);
3913 } while(offset < keylen);
3914 memset(shaoutput, 0, sizeof(shaoutput));
3916 ret = krb5_random_to_key(context, type, keydata, keylen, key);
3917 memset(keydata, 0, sizeof(keylen));
3925 static krb5_error_code
3926 krb5_get_keyid(krb5_context context,
3931 unsigned char tmp[16];
3934 MD5_Update (&md5, key->keyvalue.data, key->keyvalue.length);
3935 MD5_Final (tmp, &md5);
3936 *keyid = (tmp[12] << 24) | (tmp[13] << 16) | (tmp[14] << 8) | tmp[15];
3941 krb5_crypto_debug(krb5_context context,
3948 krb5_get_keyid(context, key, &keyid);
3949 krb5_enctype_to_string(context, key->keytype, &kt);
3950 krb5_warnx(context, "%s %lu bytes with key-id %#x (%s)",
3951 encryptp ? "encrypting" : "decrypting",
3958 #endif /* CRYPTO_DEBUG */
3966 krb5_context context;
3971 unsigned usage = ENCRYPTION_USAGE(3);
3972 krb5_error_code ret;
3974 ret = krb5_init_context(&context);
3976 errx (1, "krb5_init_context failed: %d", ret);
3978 key.keytype = ETYPE_NEW_DES3_CBC_SHA1;
3979 key.keyvalue.data = "\xb3\x85\x58\x94\xd9\xdc\x7c\xc8"
3980 "\x25\xe9\x85\xab\x3e\xb5\xfb\x0e"
3981 "\xc8\xdf\xab\x26\x86\x64\x15\x25";
3982 key.keyvalue.length = 24;
3984 krb5_crypto_init(context, &key, 0, &crypto);
3986 d = _new_derived_key(crypto, usage);
3989 krb5_copy_keyblock(context, crypto->key.key, &d->key);
3990 _krb5_put_int(constant, usage, 4);
3991 derive_key(context, crypto->et, d, constant, sizeof(constant));
3995 krb5_context context;
3999 krb5_error_code ret;
4002 char *data = "what do ya want for nothing?";
4004 ret = krb5_init_context(&context);
4006 errx (1, "krb5_init_context failed: %d", ret);
4008 key.keytype = ETYPE_NEW_DES3_CBC_SHA1;
4009 key.keyvalue.data = "Jefe";
4010 /* "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"
4011 "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"; */
4012 key.keyvalue.length = 4;
4014 d = calloc(1, sizeof(*d));
4017 res.checksum.length = 20;
4018 res.checksum.data = malloc(res.checksum.length);
4019 SP_HMAC_SHA1_checksum(context, d, data, 28, &res);