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 20981 2007-06-07 20:05:50Z lha $");
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 CRYPTO_ETYPE(C) ((C)->et->type)
62 /* bits for `flags' below */
63 #define F_KEYED 1 /* checksum is keyed */
64 #define F_CPROOF 2 /* checksum is collision proof */
65 #define F_DERIVED 4 /* uses derived keys */
66 #define F_VARIANT 8 /* uses `variant' keys (6.4.3) */
67 #define F_PSEUDO 16 /* not a real protocol type */
68 #define F_SPECIAL 32 /* backwards */
69 #define F_DISABLED 64 /* enctype/checksum disabled */
74 krb5_error_code (*string_to_key)(krb5_context, krb5_enctype, krb5_data,
75 krb5_salt, krb5_data, krb5_keyblock*);
79 krb5_keytype type; /* XXX */
85 krb5_enctype best_etype;
87 void (*random_key)(krb5_context, krb5_keyblock*);
88 void (*schedule)(krb5_context, struct key_data *);
89 struct salt_type *string_to_key;
90 void (*random_to_key)(krb5_context, krb5_keyblock*, const void*, size_t);
93 struct checksum_type {
99 void (*checksum)(krb5_context context,
100 struct key_data *key,
101 const void *buf, size_t len,
104 krb5_error_code (*verify)(krb5_context context,
105 struct key_data *key,
106 const void *buf, size_t len,
111 struct encryption_type {
117 size_t confoundersize;
118 struct key_type *keytype;
119 struct checksum_type *checksum;
120 struct checksum_type *keyed_checksum;
122 krb5_error_code (*encrypt)(krb5_context context,
123 struct key_data *key,
124 void *data, size_t len,
125 krb5_boolean encryptp,
129 krb5_error_code (*prf)(krb5_context,
130 krb5_crypto, const krb5_data *, krb5_data *);
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 = {
732 static struct key_type keytype_des = {
737 sizeof(DES_key_schedule),
741 krb5_DES_random_to_key
744 static struct key_type keytype_des3 = {
748 3 * sizeof(DES_cblock),
749 3 * sizeof(DES_key_schedule),
756 static struct key_type keytype_des3_derived = {
760 3 * sizeof(DES_cblock),
761 3 * sizeof(DES_key_schedule),
768 static struct key_type keytype_aes128 = {
773 sizeof(struct krb5_aes_schedule),
779 static struct key_type keytype_aes256 = {
784 sizeof(struct krb5_aes_schedule),
790 static struct key_type keytype_arcfour = {
801 static struct key_type *keytypes[] = {
804 &keytype_des3_derived,
811 static int num_keytypes = sizeof(keytypes) / sizeof(keytypes[0]);
813 static struct key_type *
814 _find_keytype(krb5_keytype type)
817 for(i = 0; i < num_keytypes; i++)
818 if(keytypes[i]->type == type)
824 krb5_error_code KRB5_LIB_FUNCTION
825 krb5_salttype_to_string (krb5_context context,
830 struct encryption_type *e;
831 struct salt_type *st;
833 e = _find_enctype (etype);
835 krb5_set_error_string(context, "encryption type %d not supported",
837 return KRB5_PROG_ETYPE_NOSUPP;
839 for (st = e->keytype->string_to_key; st && st->type; st++) {
840 if (st->type == stype) {
841 *string = strdup (st->name);
842 if (*string == NULL) {
843 krb5_set_error_string(context, "malloc: out of memory");
849 krb5_set_error_string(context, "salttype %d not supported", stype);
850 return HEIM_ERR_SALTTYPE_NOSUPP;
853 krb5_error_code KRB5_LIB_FUNCTION
854 krb5_string_to_salttype (krb5_context context,
857 krb5_salttype *salttype)
859 struct encryption_type *e;
860 struct salt_type *st;
862 e = _find_enctype (etype);
864 krb5_set_error_string(context, "encryption type %d not supported",
866 return KRB5_PROG_ETYPE_NOSUPP;
868 for (st = e->keytype->string_to_key; st && st->type; st++) {
869 if (strcasecmp (st->name, string) == 0) {
870 *salttype = st->type;
874 krb5_set_error_string(context, "salttype %s not supported", string);
875 return HEIM_ERR_SALTTYPE_NOSUPP;
878 krb5_error_code KRB5_LIB_FUNCTION
879 krb5_get_pw_salt(krb5_context context,
880 krb5_const_principal principal,
888 salt->salttype = KRB5_PW_SALT;
889 len = strlen(principal->realm);
890 for (i = 0; i < principal->name.name_string.len; ++i)
891 len += strlen(principal->name.name_string.val[i]);
892 ret = krb5_data_alloc (&salt->saltvalue, len);
895 p = salt->saltvalue.data;
896 memcpy (p, principal->realm, strlen(principal->realm));
897 p += strlen(principal->realm);
898 for (i = 0; i < principal->name.name_string.len; ++i) {
900 principal->name.name_string.val[i],
901 strlen(principal->name.name_string.val[i]));
902 p += strlen(principal->name.name_string.val[i]);
907 krb5_error_code KRB5_LIB_FUNCTION
908 krb5_free_salt(krb5_context context,
911 krb5_data_free(&salt.saltvalue);
915 krb5_error_code KRB5_LIB_FUNCTION
916 krb5_string_to_key_data (krb5_context context,
917 krb5_enctype enctype,
919 krb5_principal principal,
925 ret = krb5_get_pw_salt(context, principal, &salt);
928 ret = krb5_string_to_key_data_salt(context, enctype, password, salt, key);
929 krb5_free_salt(context, salt);
933 krb5_error_code KRB5_LIB_FUNCTION
934 krb5_string_to_key (krb5_context context,
935 krb5_enctype enctype,
936 const char *password,
937 krb5_principal principal,
941 pw.data = rk_UNCONST(password);
942 pw.length = strlen(password);
943 return krb5_string_to_key_data(context, enctype, pw, principal, key);
946 krb5_error_code KRB5_LIB_FUNCTION
947 krb5_string_to_key_data_salt (krb5_context context,
948 krb5_enctype enctype,
954 krb5_data_zero(&opaque);
955 return krb5_string_to_key_data_salt_opaque(context, enctype, password,
960 * Do a string -> key for encryption type `enctype' operation on
961 * `password' (with salt `salt' and the enctype specific data string
962 * `opaque'), returning the resulting key in `key'
965 krb5_error_code KRB5_LIB_FUNCTION
966 krb5_string_to_key_data_salt_opaque (krb5_context context,
967 krb5_enctype enctype,
973 struct encryption_type *et =_find_enctype(enctype);
974 struct salt_type *st;
976 krb5_set_error_string(context, "encryption type %d not supported",
978 return KRB5_PROG_ETYPE_NOSUPP;
980 for(st = et->keytype->string_to_key; st && st->type; st++)
981 if(st->type == salt.salttype)
982 return (*st->string_to_key)(context, enctype, password,
984 krb5_set_error_string(context, "salt type %d not supported",
986 return HEIM_ERR_SALTTYPE_NOSUPP;
990 * Do a string -> key for encryption type `enctype' operation on the
991 * string `password' (with salt `salt'), returning the resulting key
995 krb5_error_code KRB5_LIB_FUNCTION
996 krb5_string_to_key_salt (krb5_context context,
997 krb5_enctype enctype,
998 const char *password,
1003 pw.data = rk_UNCONST(password);
1004 pw.length = strlen(password);
1005 return krb5_string_to_key_data_salt(context, enctype, pw, salt, key);
1008 krb5_error_code KRB5_LIB_FUNCTION
1009 krb5_string_to_key_salt_opaque (krb5_context context,
1010 krb5_enctype enctype,
1011 const char *password,
1017 pw.data = rk_UNCONST(password);
1018 pw.length = strlen(password);
1019 return krb5_string_to_key_data_salt_opaque(context, enctype,
1020 pw, salt, opaque, key);
1023 krb5_error_code KRB5_LIB_FUNCTION
1024 krb5_keytype_to_string(krb5_context context,
1025 krb5_keytype keytype,
1028 struct key_type *kt = _find_keytype(keytype);
1030 krb5_set_error_string(context, "key type %d not supported", keytype);
1031 return KRB5_PROG_KEYTYPE_NOSUPP;
1033 *string = strdup(kt->name);
1034 if(*string == NULL) {
1035 krb5_set_error_string(context, "malloc: out of memory");
1041 krb5_error_code KRB5_LIB_FUNCTION
1042 krb5_string_to_keytype(krb5_context context,
1044 krb5_keytype *keytype)
1047 for(i = 0; i < num_keytypes; i++)
1048 if(strcasecmp(keytypes[i]->name, string) == 0){
1049 *keytype = keytypes[i]->type;
1052 krb5_set_error_string(context, "key type %s not supported", string);
1053 return KRB5_PROG_KEYTYPE_NOSUPP;
1056 krb5_error_code KRB5_LIB_FUNCTION
1057 krb5_enctype_keysize(krb5_context context,
1061 struct encryption_type *et = _find_enctype(type);
1063 krb5_set_error_string(context, "encryption type %d not supported",
1065 return KRB5_PROG_ETYPE_NOSUPP;
1067 *keysize = et->keytype->size;
1071 krb5_error_code KRB5_LIB_FUNCTION
1072 krb5_enctype_keybits(krb5_context context,
1076 struct encryption_type *et = _find_enctype(type);
1078 krb5_set_error_string(context, "encryption type %d not supported",
1080 return KRB5_PROG_ETYPE_NOSUPP;
1082 *keybits = et->keytype->bits;
1086 krb5_error_code KRB5_LIB_FUNCTION
1087 krb5_generate_random_keyblock(krb5_context context,
1091 krb5_error_code ret;
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 ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
1101 key->keytype = type;
1102 if(et->keytype->random_key)
1103 (*et->keytype->random_key)(context, key);
1105 krb5_generate_random_block(key->keyvalue.data,
1106 key->keyvalue.length);
1110 static krb5_error_code
1111 _key_schedule(krb5_context context,
1112 struct key_data *key)
1114 krb5_error_code ret;
1115 struct encryption_type *et = _find_enctype(key->key->keytype);
1116 struct key_type *kt = et->keytype;
1118 if(kt->schedule == NULL)
1120 if (key->schedule != NULL)
1122 ALLOC(key->schedule, 1);
1123 if(key->schedule == NULL) {
1124 krb5_set_error_string(context, "malloc: out of memory");
1127 ret = krb5_data_alloc(key->schedule, kt->schedule_size);
1129 free(key->schedule);
1130 key->schedule = NULL;
1133 (*kt->schedule)(context, key);
1137 /************************************************************
1139 ************************************************************/
1142 NONE_checksum(krb5_context context,
1143 struct key_data *key,
1152 CRC32_checksum(krb5_context context,
1153 struct key_data *key,
1160 unsigned char *r = C->checksum.data;
1161 _krb5_crc_init_table ();
1162 crc = _krb5_crc_update (data, len, 0);
1164 r[1] = (crc >> 8) & 0xff;
1165 r[2] = (crc >> 16) & 0xff;
1166 r[3] = (crc >> 24) & 0xff;
1170 RSA_MD4_checksum(krb5_context context,
1171 struct key_data *key,
1180 MD4_Update (&m, data, len);
1181 MD4_Final (C->checksum.data, &m);
1185 RSA_MD4_DES_checksum(krb5_context context,
1186 struct key_data *key,
1194 unsigned char *p = cksum->checksum.data;
1196 krb5_generate_random_block(p, 8);
1198 MD4_Update (&md4, p, 8);
1199 MD4_Update (&md4, data, len);
1200 MD4_Final (p + 8, &md4);
1201 memset (&ivec, 0, sizeof(ivec));
1205 key->schedule->data,
1210 static krb5_error_code
1211 RSA_MD4_DES_verify(krb5_context context,
1212 struct key_data *key,
1219 unsigned char tmp[24];
1220 unsigned char res[16];
1222 krb5_error_code ret = 0;
1224 memset(&ivec, 0, sizeof(ivec));
1225 DES_cbc_encrypt(C->checksum.data,
1228 key->schedule->data,
1232 MD4_Update (&md4, tmp, 8); /* confounder */
1233 MD4_Update (&md4, data, len);
1234 MD4_Final (res, &md4);
1235 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1236 krb5_clear_error_string (context);
1237 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1239 memset(tmp, 0, sizeof(tmp));
1240 memset(res, 0, sizeof(res));
1245 RSA_MD5_checksum(krb5_context context,
1246 struct key_data *key,
1255 MD5_Update(&m, data, len);
1256 MD5_Final (C->checksum.data, &m);
1260 RSA_MD5_DES_checksum(krb5_context context,
1261 struct key_data *key,
1269 unsigned char *p = C->checksum.data;
1271 krb5_generate_random_block(p, 8);
1273 MD5_Update (&md5, p, 8);
1274 MD5_Update (&md5, data, len);
1275 MD5_Final (p + 8, &md5);
1276 memset (&ivec, 0, sizeof(ivec));
1280 key->schedule->data,
1285 static krb5_error_code
1286 RSA_MD5_DES_verify(krb5_context context,
1287 struct key_data *key,
1294 unsigned char tmp[24];
1295 unsigned char res[16];
1297 DES_key_schedule *sched = key->schedule->data;
1298 krb5_error_code ret = 0;
1300 memset(&ivec, 0, sizeof(ivec));
1301 DES_cbc_encrypt(C->checksum.data,
1308 MD5_Update (&md5, tmp, 8); /* confounder */
1309 MD5_Update (&md5, data, len);
1310 MD5_Final (res, &md5);
1311 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1312 krb5_clear_error_string (context);
1313 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1315 memset(tmp, 0, sizeof(tmp));
1316 memset(res, 0, sizeof(res));
1321 RSA_MD5_DES3_checksum(krb5_context context,
1322 struct key_data *key,
1330 unsigned char *p = C->checksum.data;
1331 DES_key_schedule *sched = key->schedule->data;
1333 krb5_generate_random_block(p, 8);
1335 MD5_Update (&md5, p, 8);
1336 MD5_Update (&md5, data, len);
1337 MD5_Final (p + 8, &md5);
1338 memset (&ivec, 0, sizeof(ivec));
1339 DES_ede3_cbc_encrypt(p,
1342 &sched[0], &sched[1], &sched[2],
1347 static krb5_error_code
1348 RSA_MD5_DES3_verify(krb5_context context,
1349 struct key_data *key,
1356 unsigned char tmp[24];
1357 unsigned char res[16];
1359 DES_key_schedule *sched = key->schedule->data;
1360 krb5_error_code ret = 0;
1362 memset(&ivec, 0, sizeof(ivec));
1363 DES_ede3_cbc_encrypt(C->checksum.data,
1366 &sched[0], &sched[1], &sched[2],
1370 MD5_Update (&md5, tmp, 8); /* confounder */
1371 MD5_Update (&md5, data, len);
1372 MD5_Final (res, &md5);
1373 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1374 krb5_clear_error_string (context);
1375 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1377 memset(tmp, 0, sizeof(tmp));
1378 memset(res, 0, sizeof(res));
1383 SHA1_checksum(krb5_context context,
1384 struct key_data *key,
1393 SHA1_Update(&m, data, len);
1394 SHA1_Final(C->checksum.data, &m);
1397 /* HMAC according to RFC2104 */
1398 static krb5_error_code
1399 hmac(krb5_context context,
1400 struct checksum_type *cm,
1404 struct key_data *keyblock,
1407 unsigned char *ipad, *opad;
1412 ipad = malloc(cm->blocksize + len);
1415 opad = malloc(cm->blocksize + cm->checksumsize);
1420 memset(ipad, 0x36, cm->blocksize);
1421 memset(opad, 0x5c, cm->blocksize);
1423 if(keyblock->key->keyvalue.length > cm->blocksize){
1424 (*cm->checksum)(context,
1426 keyblock->key->keyvalue.data,
1427 keyblock->key->keyvalue.length,
1430 key = result->checksum.data;
1431 key_len = result->checksum.length;
1433 key = keyblock->key->keyvalue.data;
1434 key_len = keyblock->key->keyvalue.length;
1436 for(i = 0; i < key_len; i++){
1440 memcpy(ipad + cm->blocksize, data, len);
1441 (*cm->checksum)(context, keyblock, ipad, cm->blocksize + len,
1443 memcpy(opad + cm->blocksize, result->checksum.data,
1444 result->checksum.length);
1445 (*cm->checksum)(context, keyblock, opad,
1446 cm->blocksize + cm->checksumsize, usage, result);
1447 memset(ipad, 0, cm->blocksize + len);
1449 memset(opad, 0, cm->blocksize + cm->checksumsize);
1455 krb5_error_code KRB5_LIB_FUNCTION
1456 krb5_hmac(krb5_context context,
1457 krb5_cksumtype cktype,
1464 struct checksum_type *c = _find_checksum(cktype);
1466 krb5_error_code ret;
1469 krb5_set_error_string (context, "checksum type %d not supported",
1471 return KRB5_PROG_SUMTYPE_NOSUPP;
1477 ret = hmac(context, c, data, len, usage, &kd, result);
1480 krb5_free_data(context, kd.schedule);
1486 SP_HMAC_SHA1_checksum(krb5_context context,
1487 struct key_data *key,
1493 struct checksum_type *c = _find_checksum(CKSUMTYPE_SHA1);
1496 krb5_error_code ret;
1498 res.checksum.data = sha1_data;
1499 res.checksum.length = sizeof(sha1_data);
1501 ret = hmac(context, c, data, len, usage, key, &res);
1503 krb5_abortx(context, "hmac failed");
1504 memcpy(result->checksum.data, res.checksum.data, result->checksum.length);
1508 * checksum according to section 5. of draft-brezak-win2k-krb-rc4-hmac-03.txt
1512 HMAC_MD5_checksum(krb5_context context,
1513 struct key_data *key,
1520 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
1521 const char signature[] = "signaturekey";
1523 struct key_data ksign;
1526 unsigned char tmp[16];
1527 unsigned char ksign_c_data[16];
1528 krb5_error_code ret;
1530 ksign_c.checksum.length = sizeof(ksign_c_data);
1531 ksign_c.checksum.data = ksign_c_data;
1532 ret = hmac(context, c, signature, sizeof(signature), 0, key, &ksign_c);
1534 krb5_abortx(context, "hmac failed");
1536 kb.keyvalue = ksign_c.checksum;
1538 t[0] = (usage >> 0) & 0xFF;
1539 t[1] = (usage >> 8) & 0xFF;
1540 t[2] = (usage >> 16) & 0xFF;
1541 t[3] = (usage >> 24) & 0xFF;
1542 MD5_Update (&md5, t, 4);
1543 MD5_Update (&md5, data, len);
1544 MD5_Final (tmp, &md5);
1545 ret = hmac(context, c, tmp, sizeof(tmp), 0, &ksign, result);
1547 krb5_abortx(context, "hmac failed");
1551 * same as previous but being used while encrypting.
1555 HMAC_MD5_checksum_enc(krb5_context context,
1556 struct key_data *key,
1562 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
1564 struct key_data ksign;
1567 unsigned char ksign_c_data[16];
1568 krb5_error_code ret;
1570 t[0] = (usage >> 0) & 0xFF;
1571 t[1] = (usage >> 8) & 0xFF;
1572 t[2] = (usage >> 16) & 0xFF;
1573 t[3] = (usage >> 24) & 0xFF;
1575 ksign_c.checksum.length = sizeof(ksign_c_data);
1576 ksign_c.checksum.data = ksign_c_data;
1577 ret = hmac(context, c, t, sizeof(t), 0, key, &ksign_c);
1579 krb5_abortx(context, "hmac failed");
1581 kb.keyvalue = ksign_c.checksum;
1582 ret = hmac(context, c, data, len, 0, &ksign, result);
1584 krb5_abortx(context, "hmac failed");
1587 static struct checksum_type checksum_none = {
1596 static struct checksum_type checksum_crc32 = {
1605 static struct checksum_type checksum_rsa_md4 = {
1614 static struct checksum_type checksum_rsa_md4_des = {
1615 CKSUMTYPE_RSA_MD4_DES,
1619 F_KEYED | F_CPROOF | F_VARIANT,
1620 RSA_MD4_DES_checksum,
1624 static struct checksum_type checksum_des_mac = {
1632 static struct checksum_type checksum_des_mac_k = {
1633 CKSUMTYPE_DES_MAC_K,
1640 static struct checksum_type checksum_rsa_md4_des_k = {
1641 CKSUMTYPE_RSA_MD4_DES_K,
1646 RSA_MD4_DES_K_checksum,
1647 RSA_MD4_DES_K_verify
1650 static struct checksum_type checksum_rsa_md5 = {
1659 static struct checksum_type checksum_rsa_md5_des = {
1660 CKSUMTYPE_RSA_MD5_DES,
1664 F_KEYED | F_CPROOF | F_VARIANT,
1665 RSA_MD5_DES_checksum,
1668 static struct checksum_type checksum_rsa_md5_des3 = {
1669 CKSUMTYPE_RSA_MD5_DES3,
1673 F_KEYED | F_CPROOF | F_VARIANT,
1674 RSA_MD5_DES3_checksum,
1677 static struct checksum_type checksum_sha1 = {
1686 static struct checksum_type checksum_hmac_sha1_des3 = {
1687 CKSUMTYPE_HMAC_SHA1_DES3,
1691 F_KEYED | F_CPROOF | F_DERIVED,
1692 SP_HMAC_SHA1_checksum,
1696 static struct checksum_type checksum_hmac_sha1_aes128 = {
1697 CKSUMTYPE_HMAC_SHA1_96_AES_128,
1698 "hmac-sha1-96-aes128",
1701 F_KEYED | F_CPROOF | F_DERIVED,
1702 SP_HMAC_SHA1_checksum,
1706 static struct checksum_type checksum_hmac_sha1_aes256 = {
1707 CKSUMTYPE_HMAC_SHA1_96_AES_256,
1708 "hmac-sha1-96-aes256",
1711 F_KEYED | F_CPROOF | F_DERIVED,
1712 SP_HMAC_SHA1_checksum,
1716 static struct checksum_type checksum_hmac_md5 = {
1726 static struct checksum_type checksum_hmac_md5_enc = {
1727 CKSUMTYPE_HMAC_MD5_ENC,
1731 F_KEYED | F_CPROOF | F_PSEUDO,
1732 HMAC_MD5_checksum_enc,
1736 static struct checksum_type *checksum_types[] = {
1740 &checksum_rsa_md4_des,
1743 &checksum_des_mac_k,
1744 &checksum_rsa_md4_des_k,
1747 &checksum_rsa_md5_des,
1748 &checksum_rsa_md5_des3,
1750 &checksum_hmac_sha1_des3,
1751 &checksum_hmac_sha1_aes128,
1752 &checksum_hmac_sha1_aes256,
1754 &checksum_hmac_md5_enc
1757 static int num_checksums = sizeof(checksum_types) / sizeof(checksum_types[0]);
1759 static struct checksum_type *
1760 _find_checksum(krb5_cksumtype type)
1763 for(i = 0; i < num_checksums; i++)
1764 if(checksum_types[i]->type == type)
1765 return checksum_types[i];
1769 static krb5_error_code
1770 get_checksum_key(krb5_context context,
1772 unsigned usage, /* not krb5_key_usage */
1773 struct checksum_type *ct,
1774 struct key_data **key)
1776 krb5_error_code ret = 0;
1778 if(ct->flags & F_DERIVED)
1779 ret = _get_derived_key(context, crypto, usage, key);
1780 else if(ct->flags & F_VARIANT) {
1783 *key = _new_derived_key(crypto, 0xff/* KRB5_KU_RFC1510_VARIANT */);
1785 krb5_set_error_string(context, "malloc: out of memory");
1788 ret = krb5_copy_keyblock(context, crypto->key.key, &(*key)->key);
1791 for(i = 0; i < (*key)->key->keyvalue.length; i++)
1792 ((unsigned char*)(*key)->key->keyvalue.data)[i] ^= 0xF0;
1794 *key = &crypto->key;
1797 ret = _key_schedule(context, *key);
1801 static krb5_error_code
1802 create_checksum (krb5_context context,
1803 struct checksum_type *ct,
1810 krb5_error_code ret;
1811 struct key_data *dkey;
1814 if (ct->flags & F_DISABLED) {
1815 krb5_clear_error_string (context);
1816 return KRB5_PROG_SUMTYPE_NOSUPP;
1818 keyed_checksum = (ct->flags & F_KEYED) != 0;
1819 if(keyed_checksum && crypto == NULL) {
1820 krb5_set_error_string (context, "Checksum type %s is keyed "
1821 "but no crypto context (key) was passed in",
1823 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
1825 if(keyed_checksum) {
1826 ret = get_checksum_key(context, crypto, usage, ct, &dkey);
1831 result->cksumtype = ct->type;
1832 krb5_data_alloc(&result->checksum, ct->checksumsize);
1833 (*ct->checksum)(context, dkey, data, len, usage, result);
1838 arcfour_checksum_p(struct checksum_type *ct, krb5_crypto crypto)
1840 return (ct->type == CKSUMTYPE_HMAC_MD5) &&
1841 (crypto->key.key->keytype == KEYTYPE_ARCFOUR);
1844 krb5_error_code KRB5_LIB_FUNCTION
1845 krb5_create_checksum(krb5_context context,
1847 krb5_key_usage usage,
1853 struct checksum_type *ct = NULL;
1856 /* type 0 -> pick from crypto */
1858 ct = _find_checksum(type);
1859 } else if (crypto) {
1860 ct = crypto->et->keyed_checksum;
1862 ct = crypto->et->checksum;
1866 krb5_set_error_string (context, "checksum type %d not supported",
1868 return KRB5_PROG_SUMTYPE_NOSUPP;
1871 if (arcfour_checksum_p(ct, crypto)) {
1873 usage2arcfour(context, &keyusage);
1875 keyusage = CHECKSUM_USAGE(usage);
1877 return create_checksum(context, ct, crypto, keyusage,
1881 static krb5_error_code
1882 verify_checksum(krb5_context context,
1884 unsigned usage, /* not krb5_key_usage */
1889 krb5_error_code ret;
1890 struct key_data *dkey;
1893 struct checksum_type *ct;
1895 ct = _find_checksum(cksum->cksumtype);
1896 if (ct == NULL || (ct->flags & F_DISABLED)) {
1897 krb5_set_error_string (context, "checksum type %d not supported",
1899 return KRB5_PROG_SUMTYPE_NOSUPP;
1901 if(ct->checksumsize != cksum->checksum.length) {
1902 krb5_clear_error_string (context);
1903 return KRB5KRB_AP_ERR_BAD_INTEGRITY; /* XXX */
1905 keyed_checksum = (ct->flags & F_KEYED) != 0;
1906 if(keyed_checksum && crypto == NULL) {
1907 krb5_set_error_string (context, "Checksum type %s is keyed "
1908 "but no crypto context (key) was passed in",
1910 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
1913 ret = get_checksum_key(context, crypto, usage, ct, &dkey);
1917 return (*ct->verify)(context, dkey, data, len, usage, cksum);
1919 ret = krb5_data_alloc (&c.checksum, ct->checksumsize);
1923 (*ct->checksum)(context, dkey, data, len, usage, &c);
1925 if(c.checksum.length != cksum->checksum.length ||
1926 memcmp(c.checksum.data, cksum->checksum.data, c.checksum.length)) {
1927 krb5_clear_error_string (context);
1928 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1932 krb5_data_free (&c.checksum);
1936 krb5_error_code KRB5_LIB_FUNCTION
1937 krb5_verify_checksum(krb5_context context,
1939 krb5_key_usage usage,
1944 struct checksum_type *ct;
1947 ct = _find_checksum(cksum->cksumtype);
1949 krb5_set_error_string (context, "checksum type %d not supported",
1951 return KRB5_PROG_SUMTYPE_NOSUPP;
1954 if (arcfour_checksum_p(ct, crypto)) {
1956 usage2arcfour(context, &keyusage);
1958 keyusage = CHECKSUM_USAGE(usage);
1960 return verify_checksum(context, crypto, keyusage,
1964 krb5_error_code KRB5_LIB_FUNCTION
1965 krb5_crypto_get_checksum_type(krb5_context context,
1967 krb5_cksumtype *type)
1969 struct checksum_type *ct = NULL;
1971 if (crypto != NULL) {
1972 ct = crypto->et->keyed_checksum;
1974 ct = crypto->et->checksum;
1978 krb5_set_error_string (context, "checksum type not found");
1979 return KRB5_PROG_SUMTYPE_NOSUPP;
1988 krb5_error_code KRB5_LIB_FUNCTION
1989 krb5_checksumsize(krb5_context context,
1990 krb5_cksumtype type,
1993 struct checksum_type *ct = _find_checksum(type);
1995 krb5_set_error_string (context, "checksum type %d not supported",
1997 return KRB5_PROG_SUMTYPE_NOSUPP;
1999 *size = ct->checksumsize;
2003 krb5_boolean KRB5_LIB_FUNCTION
2004 krb5_checksum_is_keyed(krb5_context context,
2005 krb5_cksumtype type)
2007 struct checksum_type *ct = _find_checksum(type);
2010 krb5_set_error_string (context, "checksum type %d not supported",
2012 return KRB5_PROG_SUMTYPE_NOSUPP;
2014 return ct->flags & F_KEYED;
2017 krb5_boolean KRB5_LIB_FUNCTION
2018 krb5_checksum_is_collision_proof(krb5_context context,
2019 krb5_cksumtype type)
2021 struct checksum_type *ct = _find_checksum(type);
2024 krb5_set_error_string (context, "checksum type %d not supported",
2026 return KRB5_PROG_SUMTYPE_NOSUPP;
2028 return ct->flags & F_CPROOF;
2031 krb5_error_code KRB5_LIB_FUNCTION
2032 krb5_checksum_disable(krb5_context context,
2033 krb5_cksumtype type)
2035 struct checksum_type *ct = _find_checksum(type);
2038 krb5_set_error_string (context, "checksum type %d not supported",
2040 return KRB5_PROG_SUMTYPE_NOSUPP;
2042 ct->flags |= F_DISABLED;
2046 /************************************************************
2048 ************************************************************/
2050 static krb5_error_code
2051 NULL_encrypt(krb5_context context,
2052 struct key_data *key,
2055 krb5_boolean encryptp,
2062 static krb5_error_code
2063 DES_CBC_encrypt_null_ivec(krb5_context context,
2064 struct key_data *key,
2067 krb5_boolean encryptp,
2072 DES_key_schedule *s = key->schedule->data;
2073 memset(&ivec, 0, sizeof(ivec));
2074 DES_cbc_encrypt(data, data, len, s, &ivec, encryptp);
2078 static krb5_error_code
2079 DES_CBC_encrypt_key_ivec(krb5_context context,
2080 struct key_data *key,
2083 krb5_boolean encryptp,
2088 DES_key_schedule *s = key->schedule->data;
2089 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
2090 DES_cbc_encrypt(data, data, len, s, &ivec, encryptp);
2094 static krb5_error_code
2095 DES3_CBC_encrypt(krb5_context context,
2096 struct key_data *key,
2099 krb5_boolean encryptp,
2103 DES_cblock local_ivec;
2104 DES_key_schedule *s = key->schedule->data;
2107 memset(local_ivec, 0, sizeof(local_ivec));
2109 DES_ede3_cbc_encrypt(data, data, len, &s[0], &s[1], &s[2], ivec, encryptp);
2113 static krb5_error_code
2114 DES_CFB64_encrypt_null_ivec(krb5_context context,
2115 struct key_data *key,
2118 krb5_boolean encryptp,
2124 DES_key_schedule *s = key->schedule->data;
2125 memset(&ivec, 0, sizeof(ivec));
2127 DES_cfb64_encrypt(data, data, len, s, &ivec, &num, encryptp);
2131 static krb5_error_code
2132 DES_PCBC_encrypt_key_ivec(krb5_context context,
2133 struct key_data *key,
2136 krb5_boolean encryptp,
2141 DES_key_schedule *s = key->schedule->data;
2142 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
2144 DES_pcbc_encrypt(data, data, len, s, &ivec, encryptp);
2149 * AES draft-raeburn-krb-rijndael-krb-02
2152 void KRB5_LIB_FUNCTION
2153 _krb5_aes_cts_encrypt(const unsigned char *in, unsigned char *out,
2154 size_t len, const AES_KEY *key,
2155 unsigned char *ivec, const int encryptp)
2157 unsigned char tmp[AES_BLOCK_SIZE];
2161 * In the framework of kerberos, the length can never be shorter
2162 * then at least one blocksize.
2167 while(len > AES_BLOCK_SIZE) {
2168 for (i = 0; i < AES_BLOCK_SIZE; i++)
2169 tmp[i] = in[i] ^ ivec[i];
2170 AES_encrypt(tmp, out, key);
2171 memcpy(ivec, out, AES_BLOCK_SIZE);
2172 len -= AES_BLOCK_SIZE;
2173 in += AES_BLOCK_SIZE;
2174 out += AES_BLOCK_SIZE;
2177 for (i = 0; i < len; i++)
2178 tmp[i] = in[i] ^ ivec[i];
2179 for (; i < AES_BLOCK_SIZE; i++)
2180 tmp[i] = 0 ^ ivec[i];
2182 AES_encrypt(tmp, out - AES_BLOCK_SIZE, key);
2184 memcpy(out, ivec, len);
2185 memcpy(ivec, out - AES_BLOCK_SIZE, AES_BLOCK_SIZE);
2188 unsigned char tmp2[AES_BLOCK_SIZE];
2189 unsigned char tmp3[AES_BLOCK_SIZE];
2191 while(len > AES_BLOCK_SIZE * 2) {
2192 memcpy(tmp, in, AES_BLOCK_SIZE);
2193 AES_decrypt(in, out, key);
2194 for (i = 0; i < AES_BLOCK_SIZE; i++)
2196 memcpy(ivec, tmp, AES_BLOCK_SIZE);
2197 len -= AES_BLOCK_SIZE;
2198 in += AES_BLOCK_SIZE;
2199 out += AES_BLOCK_SIZE;
2202 len -= AES_BLOCK_SIZE;
2204 memcpy(tmp, in, AES_BLOCK_SIZE); /* save last iv */
2205 AES_decrypt(in, tmp2, key);
2207 memcpy(tmp3, in + AES_BLOCK_SIZE, len);
2208 memcpy(tmp3 + len, tmp2 + len, AES_BLOCK_SIZE - len); /* xor 0 */
2210 for (i = 0; i < len; i++)
2211 out[i + AES_BLOCK_SIZE] = tmp2[i] ^ tmp3[i];
2213 AES_decrypt(tmp3, out, key);
2214 for (i = 0; i < AES_BLOCK_SIZE; i++)
2216 memcpy(ivec, tmp, AES_BLOCK_SIZE);
2220 static krb5_error_code
2221 AES_CTS_encrypt(krb5_context context,
2222 struct key_data *key,
2225 krb5_boolean encryptp,
2229 struct krb5_aes_schedule *aeskey = key->schedule->data;
2230 char local_ivec[AES_BLOCK_SIZE];
2238 if (len < AES_BLOCK_SIZE)
2239 krb5_abortx(context, "invalid use of AES_CTS_encrypt");
2240 if (len == AES_BLOCK_SIZE) {
2242 AES_encrypt(data, data, k);
2244 AES_decrypt(data, data, k);
2247 memset(local_ivec, 0, sizeof(local_ivec));
2250 _krb5_aes_cts_encrypt(data, data, len, k, ivec, encryptp);
2257 * section 6 of draft-brezak-win2k-krb-rc4-hmac-03
2259 * warning: not for small children
2262 static krb5_error_code
2263 ARCFOUR_subencrypt(krb5_context context,
2264 struct key_data *key,
2270 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
2271 Checksum k1_c, k2_c, k3_c, cksum;
2276 unsigned char *cdata = data;
2277 unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
2278 krb5_error_code ret;
2280 t[0] = (usage >> 0) & 0xFF;
2281 t[1] = (usage >> 8) & 0xFF;
2282 t[2] = (usage >> 16) & 0xFF;
2283 t[3] = (usage >> 24) & 0xFF;
2285 k1_c.checksum.length = sizeof(k1_c_data);
2286 k1_c.checksum.data = k1_c_data;
2288 ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
2290 krb5_abortx(context, "hmac failed");
2292 memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
2294 k2_c.checksum.length = sizeof(k2_c_data);
2295 k2_c.checksum.data = k2_c_data;
2298 kb.keyvalue = k2_c.checksum;
2300 cksum.checksum.length = 16;
2301 cksum.checksum.data = data;
2303 ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
2305 krb5_abortx(context, "hmac failed");
2308 kb.keyvalue = k1_c.checksum;
2310 k3_c.checksum.length = sizeof(k3_c_data);
2311 k3_c.checksum.data = k3_c_data;
2313 ret = hmac(NULL, c, data, 16, 0, &ke, &k3_c);
2315 krb5_abortx(context, "hmac failed");
2317 RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data);
2318 RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16);
2319 memset (k1_c_data, 0, sizeof(k1_c_data));
2320 memset (k2_c_data, 0, sizeof(k2_c_data));
2321 memset (k3_c_data, 0, sizeof(k3_c_data));
2325 static krb5_error_code
2326 ARCFOUR_subdecrypt(krb5_context context,
2327 struct key_data *key,
2333 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
2334 Checksum k1_c, k2_c, k3_c, cksum;
2339 unsigned char *cdata = data;
2340 unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
2341 unsigned char cksum_data[16];
2342 krb5_error_code ret;
2344 t[0] = (usage >> 0) & 0xFF;
2345 t[1] = (usage >> 8) & 0xFF;
2346 t[2] = (usage >> 16) & 0xFF;
2347 t[3] = (usage >> 24) & 0xFF;
2349 k1_c.checksum.length = sizeof(k1_c_data);
2350 k1_c.checksum.data = k1_c_data;
2352 ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
2354 krb5_abortx(context, "hmac failed");
2356 memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
2358 k2_c.checksum.length = sizeof(k2_c_data);
2359 k2_c.checksum.data = k2_c_data;
2362 kb.keyvalue = k1_c.checksum;
2364 k3_c.checksum.length = sizeof(k3_c_data);
2365 k3_c.checksum.data = k3_c_data;
2367 ret = hmac(NULL, c, cdata, 16, 0, &ke, &k3_c);
2369 krb5_abortx(context, "hmac failed");
2371 RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data);
2372 RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16);
2375 kb.keyvalue = k2_c.checksum;
2377 cksum.checksum.length = 16;
2378 cksum.checksum.data = cksum_data;
2380 ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
2382 krb5_abortx(context, "hmac failed");
2384 memset (k1_c_data, 0, sizeof(k1_c_data));
2385 memset (k2_c_data, 0, sizeof(k2_c_data));
2386 memset (k3_c_data, 0, sizeof(k3_c_data));
2388 if (memcmp (cksum.checksum.data, data, 16) != 0) {
2389 krb5_clear_error_string (context);
2390 return KRB5KRB_AP_ERR_BAD_INTEGRITY;
2397 * convert the usage numbers used in
2398 * draft-ietf-cat-kerb-key-derivation-00.txt to the ones in
2399 * draft-brezak-win2k-krb-rc4-hmac-04.txt
2402 static krb5_error_code
2403 usage2arcfour (krb5_context context, unsigned *usage)
2406 case KRB5_KU_AS_REP_ENC_PART : /* 3 */
2407 case KRB5_KU_TGS_REP_ENC_PART_SUB_KEY : /* 9 */
2410 case KRB5_KU_USAGE_SEAL : /* 22 */
2413 case KRB5_KU_USAGE_SIGN : /* 23 */
2416 case KRB5_KU_USAGE_SEQ: /* 24 */
2424 static krb5_error_code
2425 ARCFOUR_encrypt(krb5_context context,
2426 struct key_data *key,
2429 krb5_boolean encryptp,
2433 krb5_error_code ret;
2434 unsigned keyusage = usage;
2436 if((ret = usage2arcfour (context, &keyusage)) != 0)
2440 return ARCFOUR_subencrypt (context, key, data, len, keyusage, ivec);
2442 return ARCFOUR_subdecrypt (context, key, data, len, keyusage, ivec);
2450 static krb5_error_code
2451 AES_PRF(krb5_context context,
2453 const krb5_data *in,
2456 struct checksum_type *ct = crypto->et->checksum;
2457 krb5_error_code ret;
2459 krb5_keyblock *derived;
2461 result.cksumtype = ct->type;
2462 ret = krb5_data_alloc(&result.checksum, ct->checksumsize);
2464 krb5_set_error_string(context, "out memory");
2468 (*ct->checksum)(context, NULL, in->data, in->length, 0, &result);
2470 if (result.checksum.length < crypto->et->blocksize)
2471 krb5_abortx(context, "internal prf error");
2474 ret = krb5_derive_key(context, crypto->key.key,
2475 crypto->et->type, "prf", 3, &derived);
2477 krb5_abortx(context, "krb5_derive_key");
2479 ret = krb5_data_alloc(out, crypto->et->blocksize);
2481 krb5_abortx(context, "malloc failed");
2486 AES_set_encrypt_key(derived->keyvalue.data,
2487 crypto->et->keytype->bits, &key);
2488 AES_encrypt(result.checksum.data, out->data, &key);
2489 memset(&key, 0, sizeof(key));
2492 krb5_data_free(&result.checksum);
2493 krb5_free_keyblock(context, derived);
2499 * these should currently be in reverse preference order.
2500 * (only relevant for !F_PSEUDO) */
2502 static struct encryption_type enctype_null = {
2517 static struct encryption_type enctype_des_cbc_crc = {
2528 DES_CBC_encrypt_key_ivec,
2532 static struct encryption_type enctype_des_cbc_md4 = {
2541 &checksum_rsa_md4_des,
2543 DES_CBC_encrypt_null_ivec,
2547 static struct encryption_type enctype_des_cbc_md5 = {
2556 &checksum_rsa_md5_des,
2558 DES_CBC_encrypt_null_ivec,
2562 static struct encryption_type enctype_arcfour_hmac_md5 = {
2563 ETYPE_ARCFOUR_HMAC_MD5,
2577 static struct encryption_type enctype_des3_cbc_md5 = {
2586 &checksum_rsa_md5_des3,
2592 static struct encryption_type enctype_des3_cbc_sha1 = {
2593 ETYPE_DES3_CBC_SHA1,
2599 &keytype_des3_derived,
2601 &checksum_hmac_sha1_des3,
2607 static struct encryption_type enctype_old_des3_cbc_sha1 = {
2608 ETYPE_OLD_DES3_CBC_SHA1,
2609 "old-des3-cbc-sha1",
2616 &checksum_hmac_sha1_des3,
2622 static struct encryption_type enctype_aes128_cts_hmac_sha1 = {
2623 ETYPE_AES128_CTS_HMAC_SHA1_96,
2624 "aes128-cts-hmac-sha1-96",
2631 &checksum_hmac_sha1_aes128,
2637 static struct encryption_type enctype_aes256_cts_hmac_sha1 = {
2638 ETYPE_AES256_CTS_HMAC_SHA1_96,
2639 "aes256-cts-hmac-sha1-96",
2646 &checksum_hmac_sha1_aes256,
2652 static struct encryption_type enctype_des_cbc_none = {
2663 DES_CBC_encrypt_null_ivec,
2667 static struct encryption_type enctype_des_cfb64_none = {
2668 ETYPE_DES_CFB64_NONE,
2678 DES_CFB64_encrypt_null_ivec,
2682 static struct encryption_type enctype_des_pcbc_none = {
2683 ETYPE_DES_PCBC_NONE,
2693 DES_PCBC_encrypt_key_ivec,
2697 static struct encryption_type enctype_des3_cbc_none = {
2698 ETYPE_DES3_CBC_NONE,
2704 &keytype_des3_derived,
2713 static struct encryption_type *etypes[] = {
2715 &enctype_des_cbc_crc,
2716 &enctype_des_cbc_md4,
2717 &enctype_des_cbc_md5,
2718 &enctype_arcfour_hmac_md5,
2719 &enctype_des3_cbc_md5,
2720 &enctype_des3_cbc_sha1,
2721 &enctype_old_des3_cbc_sha1,
2722 &enctype_aes128_cts_hmac_sha1,
2723 &enctype_aes256_cts_hmac_sha1,
2724 &enctype_des_cbc_none,
2725 &enctype_des_cfb64_none,
2726 &enctype_des_pcbc_none,
2727 &enctype_des3_cbc_none
2730 static unsigned num_etypes = sizeof(etypes) / sizeof(etypes[0]);
2733 static struct encryption_type *
2734 _find_enctype(krb5_enctype type)
2737 for(i = 0; i < num_etypes; i++)
2738 if(etypes[i]->type == type)
2744 krb5_error_code KRB5_LIB_FUNCTION
2745 krb5_enctype_to_string(krb5_context context,
2749 struct encryption_type *e;
2750 e = _find_enctype(etype);
2752 krb5_set_error_string (context, "encryption type %d not supported",
2754 return KRB5_PROG_ETYPE_NOSUPP;
2756 *string = strdup(e->name);
2757 if(*string == NULL) {
2758 krb5_set_error_string(context, "malloc: out of memory");
2764 krb5_error_code KRB5_LIB_FUNCTION
2765 krb5_string_to_enctype(krb5_context context,
2767 krb5_enctype *etype)
2770 for(i = 0; i < num_etypes; i++)
2771 if(strcasecmp(etypes[i]->name, string) == 0){
2772 *etype = etypes[i]->type;
2775 krb5_set_error_string (context, "encryption type %s not supported",
2777 return KRB5_PROG_ETYPE_NOSUPP;
2780 krb5_error_code KRB5_LIB_FUNCTION
2781 _krb5_enctype_to_oid(krb5_context context,
2785 struct encryption_type *et = _find_enctype(etype);
2787 krb5_set_error_string (context, "encryption type %d not supported",
2789 return KRB5_PROG_ETYPE_NOSUPP;
2791 if(et->oid == NULL) {
2792 krb5_set_error_string (context, "%s have not oid", et->name);
2793 return KRB5_PROG_ETYPE_NOSUPP;
2795 krb5_clear_error_string(context);
2796 return der_copy_oid(et->oid, oid);
2799 krb5_error_code KRB5_LIB_FUNCTION
2800 _krb5_oid_to_enctype(krb5_context context,
2801 const heim_oid *oid,
2802 krb5_enctype *etype)
2805 for(i = 0; i < num_etypes; i++) {
2806 if(etypes[i]->oid && der_heim_oid_cmp(etypes[i]->oid, oid) == 0) {
2807 *etype = etypes[i]->type;
2811 krb5_set_error_string(context, "enctype for oid not supported");
2812 return KRB5_PROG_ETYPE_NOSUPP;
2815 krb5_error_code KRB5_LIB_FUNCTION
2816 krb5_enctype_to_keytype(krb5_context context,
2818 krb5_keytype *keytype)
2820 struct encryption_type *e = _find_enctype(etype);
2822 krb5_set_error_string (context, "encryption type %d not supported",
2824 return KRB5_PROG_ETYPE_NOSUPP;
2826 *keytype = e->keytype->type; /* XXX */
2831 krb5_error_code KRB5_LIB_FUNCTION
2832 krb5_keytype_to_enctype(krb5_context context,
2833 krb5_keytype keytype,
2834 krb5_enctype *etype)
2836 struct key_type *kt = _find_keytype(keytype);
2837 krb5_warnx(context, "krb5_keytype_to_enctype(%u)", keytype);
2839 return KRB5_PROG_KEYTYPE_NOSUPP;
2840 *etype = kt->best_etype;
2845 krb5_error_code KRB5_LIB_FUNCTION
2846 krb5_keytype_to_enctypes (krb5_context context,
2847 krb5_keytype keytype,
2855 for (i = num_etypes - 1; i >= 0; --i) {
2856 if (etypes[i]->keytype->type == keytype
2857 && !(etypes[i]->flags & F_PSEUDO))
2860 ret = malloc(n * sizeof(*ret));
2861 if (ret == NULL && n != 0) {
2862 krb5_set_error_string(context, "malloc: out of memory");
2866 for (i = num_etypes - 1; i >= 0; --i) {
2867 if (etypes[i]->keytype->type == keytype
2868 && !(etypes[i]->flags & F_PSEUDO))
2869 ret[n++] = etypes[i]->type;
2877 * First take the configured list of etypes for `keytype' if available,
2878 * else, do `krb5_keytype_to_enctypes'.
2881 krb5_error_code KRB5_LIB_FUNCTION
2882 krb5_keytype_to_enctypes_default (krb5_context context,
2883 krb5_keytype keytype,
2890 if (keytype != KEYTYPE_DES || context->etypes_des == NULL)
2891 return krb5_keytype_to_enctypes (context, keytype, len, val);
2893 for (n = 0; context->etypes_des[n]; ++n)
2895 ret = malloc (n * sizeof(*ret));
2896 if (ret == NULL && n != 0) {
2897 krb5_set_error_string(context, "malloc: out of memory");
2900 for (i = 0; i < n; ++i)
2901 ret[i] = context->etypes_des[i];
2907 krb5_error_code KRB5_LIB_FUNCTION
2908 krb5_enctype_valid(krb5_context context,
2911 struct encryption_type *e = _find_enctype(etype);
2913 krb5_set_error_string (context, "encryption type %d not supported",
2915 return KRB5_PROG_ETYPE_NOSUPP;
2917 if (e->flags & F_DISABLED) {
2918 krb5_set_error_string (context, "encryption type %s is disabled",
2920 return KRB5_PROG_ETYPE_NOSUPP;
2925 krb5_error_code KRB5_LIB_FUNCTION
2926 krb5_cksumtype_valid(krb5_context context,
2927 krb5_cksumtype ctype)
2929 struct checksum_type *c = _find_checksum(ctype);
2931 krb5_set_error_string (context, "checksum type %d not supported",
2933 return KRB5_PROG_SUMTYPE_NOSUPP;
2935 if (c->flags & F_DISABLED) {
2936 krb5_set_error_string (context, "checksum type %s is disabled",
2938 return KRB5_PROG_SUMTYPE_NOSUPP;
2944 /* if two enctypes have compatible keys */
2945 krb5_boolean KRB5_LIB_FUNCTION
2946 krb5_enctypes_compatible_keys(krb5_context context,
2947 krb5_enctype etype1,
2948 krb5_enctype etype2)
2950 struct encryption_type *e1 = _find_enctype(etype1);
2951 struct encryption_type *e2 = _find_enctype(etype2);
2952 return e1 != NULL && e2 != NULL && e1->keytype == e2->keytype;
2956 derived_crypto(krb5_context context,
2959 return (crypto->et->flags & F_DERIVED) != 0;
2963 special_crypto(krb5_context context,
2966 return (crypto->et->flags & F_SPECIAL) != 0;
2969 #define CHECKSUMSIZE(C) ((C)->checksumsize)
2970 #define CHECKSUMTYPE(C) ((C)->type)
2972 static krb5_error_code
2973 encrypt_internal_derived(krb5_context context,
2981 size_t sz, block_sz, checksum_sz, total_sz;
2983 unsigned char *p, *q;
2984 krb5_error_code ret;
2985 struct key_data *dkey;
2986 const struct encryption_type *et = crypto->et;
2988 checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
2990 sz = et->confoundersize + len;
2991 block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
2992 total_sz = block_sz + checksum_sz;
2993 p = calloc(1, total_sz);
2995 krb5_set_error_string(context, "malloc: out of memory");
3000 krb5_generate_random_block(q, et->confoundersize); /* XXX */
3001 q += et->confoundersize;
3002 memcpy(q, data, len);
3004 ret = create_checksum(context,
3007 INTEGRITY_USAGE(usage),
3011 if(ret == 0 && cksum.checksum.length != checksum_sz) {
3012 free_Checksum (&cksum);
3013 krb5_clear_error_string (context);
3014 ret = KRB5_CRYPTO_INTERNAL;
3018 memcpy(p + block_sz, cksum.checksum.data, cksum.checksum.length);
3019 free_Checksum (&cksum);
3020 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
3023 ret = _key_schedule(context, dkey);
3027 krb5_crypto_debug(context, 1, block_sz, dkey->key);
3029 ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec);
3033 result->length = total_sz;
3036 memset(p, 0, total_sz);
3042 static krb5_error_code
3043 encrypt_internal(krb5_context context,
3050 size_t sz, block_sz, checksum_sz;
3052 unsigned char *p, *q;
3053 krb5_error_code ret;
3054 const struct encryption_type *et = crypto->et;
3056 checksum_sz = CHECKSUMSIZE(et->checksum);
3058 sz = et->confoundersize + checksum_sz + len;
3059 block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
3060 p = calloc(1, block_sz);
3062 krb5_set_error_string(context, "malloc: out of memory");
3067 krb5_generate_random_block(q, et->confoundersize); /* XXX */
3068 q += et->confoundersize;
3069 memset(q, 0, checksum_sz);
3071 memcpy(q, data, len);
3073 ret = create_checksum(context,
3080 if(ret == 0 && cksum.checksum.length != checksum_sz) {
3081 krb5_clear_error_string (context);
3082 free_Checksum(&cksum);
3083 ret = KRB5_CRYPTO_INTERNAL;
3087 memcpy(p + et->confoundersize, cksum.checksum.data, cksum.checksum.length);
3088 free_Checksum(&cksum);
3089 ret = _key_schedule(context, &crypto->key);
3093 krb5_crypto_debug(context, 1, block_sz, crypto->key.key);
3095 ret = (*et->encrypt)(context, &crypto->key, p, block_sz, 1, 0, ivec);
3097 memset(p, 0, block_sz);
3102 result->length = block_sz;
3105 memset(p, 0, block_sz);
3110 static krb5_error_code
3111 encrypt_internal_special(krb5_context context,
3119 struct encryption_type *et = crypto->et;
3120 size_t cksum_sz = CHECKSUMSIZE(et->checksum);
3121 size_t sz = len + cksum_sz + et->confoundersize;
3123 krb5_error_code ret;
3127 krb5_set_error_string(context, "malloc: out of memory");
3131 memset (p, 0, cksum_sz);
3133 krb5_generate_random_block(p, et->confoundersize);
3134 p += et->confoundersize;
3135 memcpy (p, data, len);
3136 ret = (*et->encrypt)(context, &crypto->key, tmp, sz, TRUE, usage, ivec);
3143 result->length = sz;
3147 static krb5_error_code
3148 decrypt_internal_derived(krb5_context context,
3159 krb5_error_code ret;
3160 struct key_data *dkey;
3161 struct encryption_type *et = crypto->et;
3164 checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
3165 if (len < checksum_sz) {
3166 krb5_set_error_string(context, "Encrypted data shorter then checksum");
3167 return KRB5_BAD_MSIZE;
3170 if (((len - checksum_sz) % et->padsize) != 0) {
3171 krb5_clear_error_string(context);
3172 return KRB5_BAD_MSIZE;
3176 if(len != 0 && p == NULL) {
3177 krb5_set_error_string(context, "malloc: out of memory");
3180 memcpy(p, data, len);
3184 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
3189 ret = _key_schedule(context, dkey);
3195 krb5_crypto_debug(context, 0, len, dkey->key);
3197 ret = (*et->encrypt)(context, dkey, p, len, 0, usage, ivec);
3203 cksum.checksum.data = p + len;
3204 cksum.checksum.length = checksum_sz;
3205 cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
3207 ret = verify_checksum(context,
3209 INTEGRITY_USAGE(usage),
3217 l = len - et->confoundersize;
3218 memmove(p, p + et->confoundersize, l);
3219 result->data = realloc(p, l);
3220 if(result->data == NULL && l != 0) {
3222 krb5_set_error_string(context, "malloc: out of memory");
3229 static krb5_error_code
3230 decrypt_internal(krb5_context context,
3237 krb5_error_code ret;
3240 size_t checksum_sz, l;
3241 struct encryption_type *et = crypto->et;
3243 if ((len % et->padsize) != 0) {
3244 krb5_clear_error_string(context);
3245 return KRB5_BAD_MSIZE;
3248 checksum_sz = CHECKSUMSIZE(et->checksum);
3250 if(len != 0 && p == NULL) {
3251 krb5_set_error_string(context, "malloc: out of memory");
3254 memcpy(p, data, len);
3256 ret = _key_schedule(context, &crypto->key);
3262 krb5_crypto_debug(context, 0, len, crypto->key.key);
3264 ret = (*et->encrypt)(context, &crypto->key, p, len, 0, 0, ivec);
3269 ret = krb5_data_copy(&cksum.checksum, p + et->confoundersize, checksum_sz);
3274 memset(p + et->confoundersize, 0, checksum_sz);
3275 cksum.cksumtype = CHECKSUMTYPE(et->checksum);
3276 ret = verify_checksum(context, NULL, 0, p, len, &cksum);
3277 free_Checksum(&cksum);
3282 l = len - et->confoundersize - checksum_sz;
3283 memmove(p, p + et->confoundersize + checksum_sz, l);
3284 result->data = realloc(p, l);
3285 if(result->data == NULL && l != 0) {
3287 krb5_set_error_string(context, "malloc: out of memory");
3294 static krb5_error_code
3295 decrypt_internal_special(krb5_context context,
3303 struct encryption_type *et = crypto->et;
3304 size_t cksum_sz = CHECKSUMSIZE(et->checksum);
3305 size_t sz = len - cksum_sz - et->confoundersize;
3307 krb5_error_code ret;
3309 if ((len % et->padsize) != 0) {
3310 krb5_clear_error_string(context);
3311 return KRB5_BAD_MSIZE;
3316 krb5_set_error_string(context, "malloc: out of memory");
3319 memcpy(p, data, len);
3321 ret = (*et->encrypt)(context, &crypto->key, p, len, FALSE, usage, ivec);
3327 memmove (p, p + cksum_sz + et->confoundersize, sz);
3328 result->data = realloc(p, sz);
3329 if(result->data == NULL && sz != 0) {
3331 krb5_set_error_string(context, "malloc: out of memory");
3334 result->length = sz;
3339 krb5_error_code KRB5_LIB_FUNCTION
3340 krb5_encrypt_ivec(krb5_context context,
3348 if(derived_crypto(context, crypto))
3349 return encrypt_internal_derived(context, crypto, usage,
3350 data, len, result, ivec);
3351 else if (special_crypto(context, crypto))
3352 return encrypt_internal_special (context, crypto, usage,
3353 data, len, result, ivec);
3355 return encrypt_internal(context, crypto, data, len, result, ivec);
3358 krb5_error_code KRB5_LIB_FUNCTION
3359 krb5_encrypt(krb5_context context,
3366 return krb5_encrypt_ivec(context, crypto, usage, data, len, result, NULL);
3369 krb5_error_code KRB5_LIB_FUNCTION
3370 krb5_encrypt_EncryptedData(krb5_context context,
3376 EncryptedData *result)
3378 result->etype = CRYPTO_ETYPE(crypto);
3380 ALLOC(result->kvno, 1);
3381 *result->kvno = kvno;
3383 result->kvno = NULL;
3384 return krb5_encrypt(context, crypto, usage, data, len, &result->cipher);
3387 krb5_error_code KRB5_LIB_FUNCTION
3388 krb5_decrypt_ivec(krb5_context context,
3396 if(derived_crypto(context, crypto))
3397 return decrypt_internal_derived(context, crypto, usage,
3398 data, len, result, ivec);
3399 else if (special_crypto (context, crypto))
3400 return decrypt_internal_special(context, crypto, usage,
3401 data, len, result, ivec);
3403 return decrypt_internal(context, crypto, data, len, result, ivec);
3406 krb5_error_code KRB5_LIB_FUNCTION
3407 krb5_decrypt(krb5_context context,
3414 return krb5_decrypt_ivec (context, crypto, usage, data, len, result,
3418 krb5_error_code KRB5_LIB_FUNCTION
3419 krb5_decrypt_EncryptedData(krb5_context context,
3422 const EncryptedData *e,
3425 return krb5_decrypt(context, crypto, usage,
3426 e->cipher.data, e->cipher.length, result);
3429 /************************************************************
3431 ************************************************************/
3433 #define ENTROPY_NEEDED 128
3436 seed_something(void)
3438 char buf[1024], seedfile[256];
3440 /* If there is a seed file, load it. But such a file cannot be trusted,
3441 so use 0 for the entropy estimate */
3442 if (RAND_file_name(seedfile, sizeof(seedfile))) {
3444 fd = open(seedfile, O_RDONLY);
3447 ret = read(fd, buf, sizeof(buf));
3449 RAND_add(buf, ret, 0.0);
3456 /* Calling RAND_status() will try to use /dev/urandom if it exists so
3457 we do not have to deal with it. */
3458 if (RAND_status() != 1) {
3459 krb5_context context;
3463 if (!krb5_init_context(&context)) {
3464 p = krb5_config_get_string(context, NULL, "libdefaults",
3465 "egd_socket", NULL);
3467 RAND_egd_bytes(p, ENTROPY_NEEDED);
3468 krb5_free_context(context);
3472 if (RAND_status() == 1) {
3473 /* Update the seed file */
3475 RAND_write_file(seedfile);
3482 void KRB5_LIB_FUNCTION
3483 krb5_generate_random_block(void *buf, size_t len)
3485 static int rng_initialized = 0;
3487 HEIMDAL_MUTEX_lock(&crypto_mutex);
3488 if (!rng_initialized) {
3489 if (seed_something())
3490 krb5_abortx(NULL, "Fatal: could not seed the "
3491 "random number generator");
3493 rng_initialized = 1;
3495 HEIMDAL_MUTEX_unlock(&crypto_mutex);
3496 if (RAND_bytes(buf, len) != 1)
3497 krb5_abortx(NULL, "Failed to generate random block");
3501 DES3_postproc(krb5_context context,
3502 unsigned char *k, size_t len, struct key_data *key)
3504 DES3_random_to_key(context, key->key, k, len);
3506 if (key->schedule) {
3507 krb5_free_data(context, key->schedule);
3508 key->schedule = NULL;
3512 static krb5_error_code
3513 derive_key(krb5_context context,
3514 struct encryption_type *et,
3515 struct key_data *key,
3516 const void *constant,
3520 unsigned int nblocks = 0, i;
3521 krb5_error_code ret = 0;
3522 struct key_type *kt = et->keytype;
3524 ret = _key_schedule(context, key);
3527 if(et->blocksize * 8 < kt->bits ||
3528 len != et->blocksize) {
3529 nblocks = (kt->bits + et->blocksize * 8 - 1) / (et->blocksize * 8);
3530 k = malloc(nblocks * et->blocksize);
3532 krb5_set_error_string(context, "malloc: out of memory");
3535 _krb5_n_fold(constant, len, k, et->blocksize);
3536 for(i = 0; i < nblocks; i++) {
3538 memcpy(k + i * et->blocksize,
3539 k + (i - 1) * et->blocksize,
3541 (*et->encrypt)(context, key, k + i * et->blocksize, et->blocksize,
3545 /* this case is probably broken, but won't be run anyway */
3546 void *c = malloc(len);
3547 size_t res_len = (kt->bits + 7) / 8;
3549 if(len != 0 && c == NULL) {
3550 krb5_set_error_string(context, "malloc: out of memory");
3553 memcpy(c, constant, len);
3554 (*et->encrypt)(context, key, c, len, 1, 0, NULL);
3555 k = malloc(res_len);
3556 if(res_len != 0 && k == NULL) {
3558 krb5_set_error_string(context, "malloc: out of memory");
3561 _krb5_n_fold(c, len, k, res_len);
3565 /* XXX keytype dependent post-processing */
3568 DES3_postproc(context, k, nblocks * et->blocksize, key);
3570 case KEYTYPE_AES128:
3571 case KEYTYPE_AES256:
3572 memcpy(key->key->keyvalue.data, k, key->key->keyvalue.length);
3575 krb5_set_error_string(context,
3576 "derive_key() called with unknown keytype (%u)",
3578 ret = KRB5_CRYPTO_INTERNAL;
3581 if (key->schedule) {
3582 krb5_free_data(context, key->schedule);
3583 key->schedule = NULL;
3585 memset(k, 0, nblocks * et->blocksize);
3590 static struct key_data *
3591 _new_derived_key(krb5_crypto crypto, unsigned usage)
3593 struct key_usage *d = crypto->key_usage;
3594 d = realloc(d, (crypto->num_key_usage + 1) * sizeof(*d));
3597 crypto->key_usage = d;
3598 d += crypto->num_key_usage++;
3599 memset(d, 0, sizeof(*d));
3604 krb5_error_code KRB5_LIB_FUNCTION
3605 krb5_derive_key(krb5_context context,
3606 const krb5_keyblock *key,
3608 const void *constant,
3609 size_t constant_len,
3610 krb5_keyblock **derived_key)
3612 krb5_error_code ret;
3613 struct encryption_type *et;
3616 *derived_key = NULL;
3618 et = _find_enctype (etype);
3620 krb5_set_error_string(context, "encryption type %d not supported",
3622 return KRB5_PROG_ETYPE_NOSUPP;
3625 ret = krb5_copy_keyblock(context, key, &d.key);
3630 ret = derive_key(context, et, &d, constant, constant_len);
3632 ret = krb5_copy_keyblock(context, d.key, derived_key);
3633 free_key_data(context, &d);
3637 static krb5_error_code
3638 _get_derived_key(krb5_context context,
3641 struct key_data **key)
3645 unsigned char constant[5];
3647 for(i = 0; i < crypto->num_key_usage; i++)
3648 if(crypto->key_usage[i].usage == usage) {
3649 *key = &crypto->key_usage[i].key;
3652 d = _new_derived_key(crypto, usage);
3654 krb5_set_error_string(context, "malloc: out of memory");
3657 krb5_copy_keyblock(context, crypto->key.key, &d->key);
3658 _krb5_put_int(constant, usage, 5);
3659 derive_key(context, crypto->et, d, constant, sizeof(constant));
3665 krb5_error_code KRB5_LIB_FUNCTION
3666 krb5_crypto_init(krb5_context context,
3667 const krb5_keyblock *key,
3669 krb5_crypto *crypto)
3671 krb5_error_code ret;
3673 if(*crypto == NULL) {
3674 krb5_set_error_string(context, "malloc: out of memory");
3677 if(etype == ETYPE_NULL)
3678 etype = key->keytype;
3679 (*crypto)->et = _find_enctype(etype);
3680 if((*crypto)->et == NULL || ((*crypto)->et->flags & F_DISABLED)) {
3683 krb5_set_error_string (context, "encryption type %d not supported",
3685 return KRB5_PROG_ETYPE_NOSUPP;
3687 if((*crypto)->et->keytype->size != key->keyvalue.length) {
3690 krb5_set_error_string (context, "encryption key has bad length");
3691 return KRB5_BAD_KEYSIZE;
3693 ret = krb5_copy_keyblock(context, key, &(*crypto)->key.key);
3699 (*crypto)->key.schedule = NULL;
3700 (*crypto)->num_key_usage = 0;
3701 (*crypto)->key_usage = NULL;
3706 free_key_data(krb5_context context, struct key_data *key)
3708 krb5_free_keyblock(context, key->key);
3710 memset(key->schedule->data, 0, key->schedule->length);
3711 krb5_free_data(context, key->schedule);
3716 free_key_usage(krb5_context context, struct key_usage *ku)
3718 free_key_data(context, &ku->key);
3721 krb5_error_code KRB5_LIB_FUNCTION
3722 krb5_crypto_destroy(krb5_context context,
3727 for(i = 0; i < crypto->num_key_usage; i++)
3728 free_key_usage(context, &crypto->key_usage[i]);
3729 free(crypto->key_usage);
3730 free_key_data(context, &crypto->key);
3735 krb5_error_code KRB5_LIB_FUNCTION
3736 krb5_crypto_getblocksize(krb5_context context,
3740 *blocksize = crypto->et->blocksize;
3744 krb5_error_code KRB5_LIB_FUNCTION
3745 krb5_crypto_getenctype(krb5_context context,
3747 krb5_enctype *enctype)
3749 *enctype = crypto->et->type;
3753 krb5_error_code KRB5_LIB_FUNCTION
3754 krb5_crypto_getpadsize(krb5_context context,
3758 *padsize = crypto->et->padsize;
3762 krb5_error_code KRB5_LIB_FUNCTION
3763 krb5_crypto_getconfoundersize(krb5_context context,
3765 size_t *confoundersize)
3767 *confoundersize = crypto->et->confoundersize;
3771 krb5_error_code KRB5_LIB_FUNCTION
3772 krb5_enctype_disable(krb5_context context,
3773 krb5_enctype enctype)
3775 struct encryption_type *et = _find_enctype(enctype);
3778 krb5_set_error_string (context, "encryption type %d not supported",
3780 return KRB5_PROG_ETYPE_NOSUPP;
3782 et->flags |= F_DISABLED;
3786 krb5_error_code KRB5_LIB_FUNCTION
3787 krb5_string_to_key_derived(krb5_context context,
3793 struct encryption_type *et = _find_enctype(etype);
3794 krb5_error_code ret;
3800 krb5_set_error_string (context, "encryption type %d not supported",
3802 return KRB5_PROG_ETYPE_NOSUPP;
3804 keylen = et->keytype->bits / 8;
3807 if(kd.key == NULL) {
3808 krb5_set_error_string (context, "malloc: out of memory");
3811 ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
3816 kd.key->keytype = etype;
3817 tmp = malloc (keylen);
3819 krb5_free_keyblock(context, kd.key);
3820 krb5_set_error_string (context, "malloc: out of memory");
3823 _krb5_n_fold(str, len, tmp, keylen);
3825 DES3_postproc (context, tmp, keylen, &kd); /* XXX */
3826 memset(tmp, 0, keylen);
3828 ret = derive_key(context,
3831 "kerberos", /* XXX well known constant */
3832 strlen("kerberos"));
3833 ret = krb5_copy_keyblock_contents(context, kd.key, key);
3834 free_key_data(context, &kd);
3839 wrapped_length (krb5_context context,
3843 struct encryption_type *et = crypto->et;
3844 size_t padsize = et->padsize;
3845 size_t checksumsize = CHECKSUMSIZE(et->checksum);
3848 res = et->confoundersize + checksumsize + data_len;
3849 res = (res + padsize - 1) / padsize * padsize;
3854 wrapped_length_dervied (krb5_context context,
3858 struct encryption_type *et = crypto->et;
3859 size_t padsize = et->padsize;
3862 res = et->confoundersize + data_len;
3863 res = (res + padsize - 1) / padsize * padsize;
3864 if (et->keyed_checksum)
3865 res += et->keyed_checksum->checksumsize;
3867 res += et->checksum->checksumsize;
3872 * Return the size of an encrypted packet of length `data_len'
3876 krb5_get_wrapped_length (krb5_context context,
3880 if (derived_crypto (context, crypto))
3881 return wrapped_length_dervied (context, crypto, data_len);
3883 return wrapped_length (context, crypto, data_len);
3887 * Return the size of an encrypted packet of length `data_len'
3891 crypto_overhead (krb5_context context,
3894 struct encryption_type *et = crypto->et;
3897 res = CHECKSUMSIZE(et->checksum);
3898 res += et->confoundersize;
3899 if (et->padsize > 1)
3905 crypto_overhead_dervied (krb5_context context,
3908 struct encryption_type *et = crypto->et;
3911 if (et->keyed_checksum)
3912 res = CHECKSUMSIZE(et->keyed_checksum);
3914 res = CHECKSUMSIZE(et->checksum);
3915 res += et->confoundersize;
3916 if (et->padsize > 1)
3922 krb5_crypto_overhead (krb5_context context, krb5_crypto crypto)
3924 if (derived_crypto (context, crypto))
3925 return crypto_overhead_dervied (context, crypto);
3927 return crypto_overhead (context, crypto);
3930 krb5_error_code KRB5_LIB_FUNCTION
3931 krb5_random_to_key(krb5_context context,
3937 krb5_error_code ret;
3938 struct encryption_type *et = _find_enctype(type);
3940 krb5_set_error_string(context, "encryption type %d not supported",
3942 return KRB5_PROG_ETYPE_NOSUPP;
3944 if ((et->keytype->bits + 7) / 8 > size) {
3945 krb5_set_error_string(context, "encryption key %s needs %d bytes "
3946 "of random to make an encryption key out of it",
3947 et->name, (int)et->keytype->size);
3948 return KRB5_PROG_ETYPE_NOSUPP;
3950 ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
3953 key->keytype = type;
3954 if (et->keytype->random_to_key)
3955 (*et->keytype->random_to_key)(context, key, data, size);
3957 memcpy(key->keyvalue.data, data, et->keytype->size);
3963 _krb5_pk_octetstring2key(krb5_context context,
3967 const heim_octet_string *c_n,
3968 const heim_octet_string *k_n,
3971 struct encryption_type *et = _find_enctype(type);
3972 krb5_error_code ret;
3973 size_t keylen, offset;
3975 unsigned char counter;
3976 unsigned char shaoutput[20];
3979 krb5_set_error_string(context, "encryption type %d not supported",
3981 return KRB5_PROG_ETYPE_NOSUPP;
3983 keylen = (et->keytype->bits + 7) / 8;
3985 keydata = malloc(keylen);
3986 if (keydata == NULL) {
3987 krb5_set_error_string(context, "malloc: out of memory");
3997 SHA1_Update(&m, &counter, 1);
3998 SHA1_Update(&m, dhdata, dhsize);
4000 SHA1_Update(&m, c_n->data, c_n->length);
4002 SHA1_Update(&m, k_n->data, k_n->length);
4003 SHA1_Final(shaoutput, &m);
4005 memcpy((unsigned char *)keydata + offset,
4007 min(keylen - offset, sizeof(shaoutput)));
4009 offset += sizeof(shaoutput);
4011 } while(offset < keylen);
4012 memset(shaoutput, 0, sizeof(shaoutput));
4014 ret = krb5_random_to_key(context, type, keydata, keylen, key);
4015 memset(keydata, 0, sizeof(keylen));
4020 krb5_error_code KRB5_LIB_FUNCTION
4021 krb5_crypto_prf_length(krb5_context context,
4025 struct encryption_type *et = _find_enctype(type);
4027 if(et == NULL || et->prf_length == 0) {
4028 krb5_set_error_string(context, "encryption type %d not supported",
4030 return KRB5_PROG_ETYPE_NOSUPP;
4033 *length = et->prf_length;
4037 krb5_error_code KRB5_LIB_FUNCTION
4038 krb5_crypto_prf(krb5_context context,
4039 const krb5_crypto crypto,
4040 const krb5_data *input,
4043 struct encryption_type *et = crypto->et;
4045 krb5_data_zero(output);
4047 if(et->prf == NULL) {
4048 krb5_set_error_string(context, "kerberos prf for %s not supported",
4050 return KRB5_PROG_ETYPE_NOSUPP;
4053 return (*et->prf)(context, crypto, input, output);
4061 static krb5_error_code
4062 krb5_get_keyid(krb5_context context,
4067 unsigned char tmp[16];
4070 MD5_Update (&md5, key->keyvalue.data, key->keyvalue.length);
4071 MD5_Final (tmp, &md5);
4072 *keyid = (tmp[12] << 24) | (tmp[13] << 16) | (tmp[14] << 8) | tmp[15];
4077 krb5_crypto_debug(krb5_context context,
4084 krb5_get_keyid(context, key, &keyid);
4085 krb5_enctype_to_string(context, key->keytype, &kt);
4086 krb5_warnx(context, "%s %lu bytes with key-id %#x (%s)",
4087 encryptp ? "encrypting" : "decrypting",
4094 #endif /* CRYPTO_DEBUG */
4102 krb5_context context;
4107 unsigned usage = ENCRYPTION_USAGE(3);
4108 krb5_error_code ret;
4110 ret = krb5_init_context(&context);
4112 errx (1, "krb5_init_context failed: %d", ret);
4114 key.keytype = ETYPE_NEW_DES3_CBC_SHA1;
4115 key.keyvalue.data = "\xb3\x85\x58\x94\xd9\xdc\x7c\xc8"
4116 "\x25\xe9\x85\xab\x3e\xb5\xfb\x0e"
4117 "\xc8\xdf\xab\x26\x86\x64\x15\x25";
4118 key.keyvalue.length = 24;
4120 krb5_crypto_init(context, &key, 0, &crypto);
4122 d = _new_derived_key(crypto, usage);
4125 krb5_copy_keyblock(context, crypto->key.key, &d->key);
4126 _krb5_put_int(constant, usage, 4);
4127 derive_key(context, crypto->et, d, constant, sizeof(constant));
4131 krb5_context context;
4135 krb5_error_code ret;
4138 char *data = "what do ya want for nothing?";
4140 ret = krb5_init_context(&context);
4142 errx (1, "krb5_init_context failed: %d", ret);
4144 key.keytype = ETYPE_NEW_DES3_CBC_SHA1;
4145 key.keyvalue.data = "Jefe";
4146 /* "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"
4147 "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"; */
4148 key.keyvalue.length = 4;
4150 d = calloc(1, sizeof(*d));
4153 res.checksum.length = 20;
4154 res.checksum.data = malloc(res.checksum.length);
4155 SP_HMAC_SHA1_checksum(context, d, data, 28, &res);