2 * Copyright (c) 1997 - 2008 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 #define KRB5_DEPRECATED
36 #include "krb5_locl.h"
37 #include <pkinit_asn1.h>
39 #ifndef HEIMDAL_SMALLER
40 #define DES3_OLD_ENCTYPE 1
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 */
70 #define F_WEAK 128 /* enctype is considered weak */
75 krb5_error_code (*string_to_key)(krb5_context, krb5_enctype, krb5_data,
76 krb5_salt, krb5_data, krb5_keyblock*);
80 krb5_keytype type; /* XXX */
85 void (*random_key)(krb5_context, krb5_keyblock*);
86 void (*schedule)(krb5_context, struct key_type *, struct key_data *);
87 struct salt_type *string_to_key;
88 void (*random_to_key)(krb5_context, krb5_keyblock*, const void*, size_t);
89 void (*cleanup)(krb5_context, struct key_data *);
90 const EVP_CIPHER *(*evp)(void);
93 struct checksum_type {
99 krb5_error_code (*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 {
116 size_t confoundersize;
117 struct key_type *keytype;
118 struct checksum_type *checksum;
119 struct checksum_type *keyed_checksum;
121 krb5_error_code (*encrypt)(krb5_context context,
122 struct key_data *key,
123 void *data, size_t len,
124 krb5_boolean encryptp,
128 krb5_error_code (*prf)(krb5_context,
129 krb5_crypto, const krb5_data *, krb5_data *);
132 #define ENCRYPTION_USAGE(U) (((U) << 8) | 0xAA)
133 #define INTEGRITY_USAGE(U) (((U) << 8) | 0x55)
134 #define CHECKSUM_USAGE(U) (((U) << 8) | 0x99)
136 static struct checksum_type *_find_checksum(krb5_cksumtype type);
137 static struct encryption_type *_find_enctype(krb5_enctype type);
138 static krb5_error_code _get_derived_key(krb5_context, krb5_crypto,
139 unsigned, struct key_data**);
140 static struct key_data *_new_derived_key(krb5_crypto crypto, unsigned usage);
141 static krb5_error_code derive_key(krb5_context context,
142 struct encryption_type *et,
143 struct key_data *key,
144 const void *constant,
146 static krb5_error_code hmac(krb5_context context,
147 struct checksum_type *cm,
151 struct key_data *keyblock,
153 static void free_key_data(krb5_context,
155 struct encryption_type *);
156 static void free_key_schedule(krb5_context,
158 struct encryption_type *);
159 static krb5_error_code usage2arcfour (krb5_context, unsigned *);
160 static void xor (DES_cblock *, const unsigned char *);
162 /************************************************************
164 ************************************************************/
166 struct evp_schedule {
172 static HEIMDAL_MUTEX crypto_mutex = HEIMDAL_MUTEX_INITIALIZER;
174 #ifdef HEIM_WEAK_CRYPTO
176 krb5_DES_random_key(krb5_context context,
179 DES_cblock *k = key->keyvalue.data;
181 krb5_generate_random_block(k, sizeof(DES_cblock));
182 DES_set_odd_parity(k);
183 } while(DES_is_weak_key(k));
187 krb5_DES_schedule_old(krb5_context context,
189 struct key_data *key)
191 DES_set_key_unchecked(key->key->keyvalue.data, key->schedule->data);
194 #ifdef ENABLE_AFS_STRING_TO_KEY
196 /* This defines the Andrew string_to_key function. It accepts a password
197 * string as input and converts it via a one-way encryption algorithm to a DES
198 * encryption key. It is compatible with the original Andrew authentication
199 * service password database.
203 * Short passwords, i.e 8 characters or less.
206 krb5_DES_AFS3_CMU_string_to_key (krb5_data pw,
210 char password[8+1]; /* crypt is limited to 8 chars anyway */
213 for(i = 0; i < 8; i++) {
214 char c = ((i < pw.length) ? ((char*)pw.data)[i] : 0) ^
216 tolower(((unsigned char*)cell.data)[i]) : 0);
217 password[i] = c ? c : 'X';
221 memcpy(key, crypt(password, "p1") + 2, sizeof(DES_cblock));
223 /* parity is inserted into the LSB so left shift each byte up one
224 bit. This allows ascii characters with a zero MSB to retain as
225 much significance as possible. */
226 for (i = 0; i < sizeof(DES_cblock); i++)
227 ((unsigned char*)key)[i] <<= 1;
228 DES_set_odd_parity (key);
232 * Long passwords, i.e 9 characters or more.
235 krb5_DES_AFS3_Transarc_string_to_key (krb5_data pw,
239 DES_key_schedule schedule;
245 memcpy(password, pw.data, min(pw.length, sizeof(password)));
246 if(pw.length < sizeof(password)) {
247 int len = min(cell.length, sizeof(password) - pw.length);
250 memcpy(password + pw.length, cell.data, len);
251 for (i = pw.length; i < pw.length + len; ++i)
252 password[i] = tolower((unsigned char)password[i]);
254 passlen = min(sizeof(password), pw.length + cell.length);
255 memcpy(&ivec, "kerberos", 8);
256 memcpy(&temp_key, "kerberos", 8);
257 DES_set_odd_parity (&temp_key);
258 DES_set_key_unchecked (&temp_key, &schedule);
259 DES_cbc_cksum ((void*)password, &ivec, passlen, &schedule, &ivec);
261 memcpy(&temp_key, &ivec, 8);
262 DES_set_odd_parity (&temp_key);
263 DES_set_key_unchecked (&temp_key, &schedule);
264 DES_cbc_cksum ((void*)password, key, passlen, &schedule, &ivec);
265 memset(&schedule, 0, sizeof(schedule));
266 memset(&temp_key, 0, sizeof(temp_key));
267 memset(&ivec, 0, sizeof(ivec));
268 memset(password, 0, sizeof(password));
270 DES_set_odd_parity (key);
273 static krb5_error_code
274 DES_AFS3_string_to_key(krb5_context context,
275 krb5_enctype enctype,
282 if(password.length > 8)
283 krb5_DES_AFS3_Transarc_string_to_key(password, salt.saltvalue, &tmp);
285 krb5_DES_AFS3_CMU_string_to_key(password, salt.saltvalue, &tmp);
286 key->keytype = enctype;
287 krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
288 memset(&key, 0, sizeof(key));
291 #endif /* ENABLE_AFS_STRING_TO_KEY */
294 DES_string_to_key_int(unsigned char *data, size_t length, DES_cblock *key)
296 DES_key_schedule schedule;
301 unsigned char swap[] = { 0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
302 0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf };
305 p = (unsigned char*)key;
306 for (i = 0; i < length; i++) {
307 unsigned char tmp = data[i];
311 *--p ^= (swap[tmp & 0xf] << 4) | swap[(tmp & 0xf0) >> 4];
315 DES_set_odd_parity(key);
316 if(DES_is_weak_key(key))
318 DES_set_key_unchecked(key, &schedule);
319 DES_cbc_cksum((void*)data, key, length, &schedule, key);
320 memset(&schedule, 0, sizeof(schedule));
321 DES_set_odd_parity(key);
322 if(DES_is_weak_key(key))
326 static krb5_error_code
327 krb5_DES_string_to_key(krb5_context context,
328 krb5_enctype enctype,
338 #ifdef ENABLE_AFS_STRING_TO_KEY
339 if (opaque.length == 1) {
341 _krb5_get_int(opaque.data, &v, 1);
343 return DES_AFS3_string_to_key(context, enctype, password,
348 len = password.length + salt.saltvalue.length;
350 if(len > 0 && s == NULL) {
351 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
354 memcpy(s, password.data, password.length);
355 memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
356 DES_string_to_key_int(s, len, &tmp);
357 key->keytype = enctype;
358 krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
359 memset(&tmp, 0, sizeof(tmp));
366 krb5_DES_random_to_key(krb5_context context,
371 DES_cblock *k = key->keyvalue.data;
372 memcpy(k, data, key->keyvalue.length);
373 DES_set_odd_parity(k);
374 if(DES_is_weak_key(k))
375 xor(k, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
384 DES3_random_key(krb5_context context,
387 DES_cblock *k = key->keyvalue.data;
389 krb5_generate_random_block(k, 3 * sizeof(DES_cblock));
390 DES_set_odd_parity(&k[0]);
391 DES_set_odd_parity(&k[1]);
392 DES_set_odd_parity(&k[2]);
393 } while(DES_is_weak_key(&k[0]) ||
394 DES_is_weak_key(&k[1]) ||
395 DES_is_weak_key(&k[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 #ifdef DES3_OLD_ENCTYPE
417 static krb5_error_code
418 DES3_string_to_key(krb5_context context,
419 krb5_enctype enctype,
427 unsigned char tmp[24];
431 len = password.length + salt.saltvalue.length;
433 if(len != 0 && str == NULL) {
434 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
437 memcpy(str, password.data, password.length);
438 memcpy(str + password.length, salt.saltvalue.data, salt.saltvalue.length);
441 DES_key_schedule s[3];
444 ret = _krb5_n_fold(str, len, tmp, 24);
448 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
452 for(i = 0; i < 3; i++){
453 memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
454 DES_set_odd_parity(keys + i);
455 if(DES_is_weak_key(keys + i))
456 xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
457 DES_set_key_unchecked(keys + i, &s[i]);
459 memset(&ivec, 0, sizeof(ivec));
460 DES_ede3_cbc_encrypt(tmp,
462 &s[0], &s[1], &s[2], &ivec, DES_ENCRYPT);
463 memset(s, 0, sizeof(s));
464 memset(&ivec, 0, sizeof(ivec));
465 for(i = 0; i < 3; i++){
466 memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
467 DES_set_odd_parity(keys + i);
468 if(DES_is_weak_key(keys + i))
469 xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
471 memset(tmp, 0, sizeof(tmp));
473 key->keytype = enctype;
474 krb5_data_copy(&key->keyvalue, keys, sizeof(keys));
475 memset(keys, 0, sizeof(keys));
482 static krb5_error_code
483 DES3_string_to_key_derived(krb5_context context,
484 krb5_enctype enctype,
491 size_t len = password.length + salt.saltvalue.length;
495 if(len != 0 && s == NULL) {
496 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
499 memcpy(s, password.data, password.length);
500 memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
501 ret = krb5_string_to_key_derived(context,
512 DES3_random_to_key(krb5_context context,
517 unsigned char *x = key->keyvalue.data;
518 const u_char *q = data;
522 memset(x, 0, sizeof(x));
523 for (i = 0; i < 3; ++i) {
525 for (j = 0; j < 7; ++j) {
526 unsigned char b = q[7 * i + j];
531 for (j = 6; j >= 0; --j) {
532 foo |= q[7 * i + j] & 1;
537 k = key->keyvalue.data;
538 for (i = 0; i < 3; i++) {
539 DES_set_odd_parity(&k[i]);
540 if(DES_is_weak_key(&k[i]))
541 xor(&k[i], (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
549 static krb5_error_code
550 ARCFOUR_string_to_key(krb5_context context,
551 krb5_enctype enctype,
562 m = EVP_MD_CTX_create();
565 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
569 EVP_DigestInit_ex(m, EVP_md4(), NULL);
571 ret = wind_utf8ucs2_length(password.data, &len);
573 krb5_set_error_message (context, ret,
574 N_("Password not an UCS2 string", ""));
578 s = malloc (len * sizeof(s[0]));
579 if (len != 0 && s == NULL) {
580 krb5_set_error_message (context, ENOMEM,
581 N_("malloc: out of memory", ""));
586 ret = wind_utf8ucs2(password.data, s, &len);
588 krb5_set_error_message (context, ret,
589 N_("Password not an UCS2 string", ""));
594 for (i = 0; i < len; i++) {
597 EVP_DigestUpdate (m, &p, 1);
598 p = (s[i] >> 8) & 0xff;
599 EVP_DigestUpdate (m, &p, 1);
602 key->keytype = enctype;
603 ret = krb5_data_alloc (&key->keyvalue, 16);
605 krb5_set_error_message (context, ENOMEM, N_("malloc: out of memory", ""));
608 EVP_DigestFinal_ex (m, key->keyvalue.data, NULL);
611 EVP_MD_CTX_destroy(m);
622 int _krb5_AES_string_to_default_iterator = 4096;
624 static krb5_error_code
625 AES_string_to_key(krb5_context context,
626 krb5_enctype enctype,
634 struct encryption_type *et;
637 if (opaque.length == 0)
638 iter = _krb5_AES_string_to_default_iterator;
639 else if (opaque.length == 4) {
641 _krb5_get_int(opaque.data, &v, 4);
642 iter = ((uint32_t)v);
644 return KRB5_PROG_KEYTYPE_NOSUPP; /* XXX */
646 et = _find_enctype(enctype);
648 return KRB5_PROG_KEYTYPE_NOSUPP;
653 krb5_set_error_message (context, ENOMEM, N_("malloc: out of memory", ""));
656 kd.key->keytype = enctype;
657 ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
659 krb5_set_error_message (context, ret, N_("malloc: out of memory", ""));
663 ret = PKCS5_PBKDF2_HMAC_SHA1(password.data, password.length,
664 salt.saltvalue.data, salt.saltvalue.length,
666 et->keytype->size, kd.key->keyvalue.data);
668 free_key_data(context, &kd, et);
669 krb5_set_error_message(context, KRB5_PROG_KEYTYPE_NOSUPP,
670 "Error calculating s2k");
671 return KRB5_PROG_KEYTYPE_NOSUPP;
674 ret = derive_key(context, et, &kd, "kerberos", strlen("kerberos"));
676 ret = krb5_copy_keyblock_contents(context, kd.key, key);
677 free_key_data(context, &kd, et);
683 evp_schedule(krb5_context context, struct key_type *kt, struct key_data *kd)
685 struct evp_schedule *key = kd->schedule->data;
686 const EVP_CIPHER *c = (*kt->evp)();
688 EVP_CIPHER_CTX_init(&key->ectx);
689 EVP_CIPHER_CTX_init(&key->dctx);
691 EVP_CipherInit_ex(&key->ectx, c, NULL, kd->key->keyvalue.data, NULL, 1);
692 EVP_CipherInit_ex(&key->dctx, c, NULL, kd->key->keyvalue.data, NULL, 0);
696 evp_cleanup(krb5_context context, struct key_data *kd)
698 struct evp_schedule *key = kd->schedule->data;
699 EVP_CIPHER_CTX_cleanup(&key->ectx);
700 EVP_CIPHER_CTX_cleanup(&key->dctx);
707 #ifdef HEIM_WEAK_CRYPTO
708 static struct salt_type des_salt[] = {
712 krb5_DES_string_to_key
714 #ifdef ENABLE_AFS_STRING_TO_KEY
718 DES_AFS3_string_to_key
725 #ifdef DES3_OLD_ENCTYPE
726 static struct salt_type des3_salt[] = {
736 static struct salt_type des3_salt_derived[] = {
740 DES3_string_to_key_derived
745 static struct salt_type AES_salt[] = {
754 static struct salt_type arcfour_salt[] = {
758 ARCFOUR_string_to_key
767 static struct key_type keytype_null = {
778 #ifdef HEIM_WEAK_CRYPTO
779 static struct key_type keytype_des_old = {
784 sizeof(DES_key_schedule),
786 krb5_DES_schedule_old,
788 krb5_DES_random_to_key
791 static struct key_type keytype_des = {
796 sizeof(struct evp_schedule),
800 krb5_DES_random_to_key,
804 #endif /* HEIM_WEAK_CRYPTO */
806 #ifdef DES3_OLD_ENCTYPE
807 static struct key_type keytype_des3 = {
812 sizeof(struct evp_schedule),
822 static struct key_type keytype_des3_derived = {
827 sizeof(struct evp_schedule),
836 static struct key_type keytype_aes128 = {
841 sizeof(struct evp_schedule),
850 static struct key_type keytype_aes256 = {
855 sizeof(struct evp_schedule),
864 static struct key_type keytype_arcfour = {
869 sizeof(struct evp_schedule),
878 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
879 krb5_salttype_to_string (krb5_context context,
884 struct encryption_type *e;
885 struct salt_type *st;
887 e = _find_enctype (etype);
889 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
890 "encryption type %d not supported",
892 return KRB5_PROG_ETYPE_NOSUPP;
894 for (st = e->keytype->string_to_key; st && st->type; st++) {
895 if (st->type == stype) {
896 *string = strdup (st->name);
897 if (*string == NULL) {
898 krb5_set_error_message (context, ENOMEM,
899 N_("malloc: out of memory", ""));
905 krb5_set_error_message (context, HEIM_ERR_SALTTYPE_NOSUPP,
906 "salttype %d not supported", stype);
907 return HEIM_ERR_SALTTYPE_NOSUPP;
910 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
911 krb5_string_to_salttype (krb5_context context,
914 krb5_salttype *salttype)
916 struct encryption_type *e;
917 struct salt_type *st;
919 e = _find_enctype (etype);
921 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
922 N_("encryption type %d not supported", ""),
924 return KRB5_PROG_ETYPE_NOSUPP;
926 for (st = e->keytype->string_to_key; st && st->type; st++) {
927 if (strcasecmp (st->name, string) == 0) {
928 *salttype = st->type;
932 krb5_set_error_message(context, HEIM_ERR_SALTTYPE_NOSUPP,
933 N_("salttype %s not supported", ""), string);
934 return HEIM_ERR_SALTTYPE_NOSUPP;
937 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
938 krb5_get_pw_salt(krb5_context context,
939 krb5_const_principal principal,
947 salt->salttype = KRB5_PW_SALT;
948 len = strlen(principal->realm);
949 for (i = 0; i < principal->name.name_string.len; ++i)
950 len += strlen(principal->name.name_string.val[i]);
951 ret = krb5_data_alloc (&salt->saltvalue, len);
954 p = salt->saltvalue.data;
955 memcpy (p, principal->realm, strlen(principal->realm));
956 p += strlen(principal->realm);
957 for (i = 0; i < principal->name.name_string.len; ++i) {
959 principal->name.name_string.val[i],
960 strlen(principal->name.name_string.val[i]));
961 p += strlen(principal->name.name_string.val[i]);
966 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
967 krb5_free_salt(krb5_context context,
970 krb5_data_free(&salt.saltvalue);
974 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
975 krb5_string_to_key_data (krb5_context context,
976 krb5_enctype enctype,
978 krb5_principal principal,
984 ret = krb5_get_pw_salt(context, principal, &salt);
987 ret = krb5_string_to_key_data_salt(context, enctype, password, salt, key);
988 krb5_free_salt(context, salt);
992 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
993 krb5_string_to_key (krb5_context context,
994 krb5_enctype enctype,
995 const char *password,
996 krb5_principal principal,
1000 pw.data = rk_UNCONST(password);
1001 pw.length = strlen(password);
1002 return krb5_string_to_key_data(context, enctype, pw, principal, key);
1005 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1006 krb5_string_to_key_data_salt (krb5_context context,
1007 krb5_enctype enctype,
1013 krb5_data_zero(&opaque);
1014 return krb5_string_to_key_data_salt_opaque(context, enctype, password,
1019 * Do a string -> key for encryption type `enctype' operation on
1020 * `password' (with salt `salt' and the enctype specific data string
1021 * `opaque'), returning the resulting key in `key'
1024 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1025 krb5_string_to_key_data_salt_opaque (krb5_context context,
1026 krb5_enctype enctype,
1032 struct encryption_type *et =_find_enctype(enctype);
1033 struct salt_type *st;
1035 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
1036 N_("encryption type %d not supported", ""),
1038 return KRB5_PROG_ETYPE_NOSUPP;
1040 for(st = et->keytype->string_to_key; st && st->type; st++)
1041 if(st->type == salt.salttype)
1042 return (*st->string_to_key)(context, enctype, password,
1044 krb5_set_error_message(context, HEIM_ERR_SALTTYPE_NOSUPP,
1045 N_("salt type %d not supported", ""),
1047 return HEIM_ERR_SALTTYPE_NOSUPP;
1051 * Do a string -> key for encryption type `enctype' operation on the
1052 * string `password' (with salt `salt'), returning the resulting key
1056 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1057 krb5_string_to_key_salt (krb5_context context,
1058 krb5_enctype enctype,
1059 const char *password,
1064 pw.data = rk_UNCONST(password);
1065 pw.length = strlen(password);
1066 return krb5_string_to_key_data_salt(context, enctype, pw, salt, key);
1069 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1070 krb5_string_to_key_salt_opaque (krb5_context context,
1071 krb5_enctype enctype,
1072 const char *password,
1078 pw.data = rk_UNCONST(password);
1079 pw.length = strlen(password);
1080 return krb5_string_to_key_data_salt_opaque(context, enctype,
1081 pw, salt, opaque, key);
1084 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1085 krb5_enctype_keysize(krb5_context context,
1089 struct encryption_type *et = _find_enctype(type);
1091 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
1092 N_("encryption type %d not supported", ""),
1094 return KRB5_PROG_ETYPE_NOSUPP;
1096 *keysize = et->keytype->size;
1100 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1101 krb5_enctype_keybits(krb5_context context,
1105 struct encryption_type *et = _find_enctype(type);
1107 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
1108 "encryption type %d not supported",
1110 return KRB5_PROG_ETYPE_NOSUPP;
1112 *keybits = et->keytype->bits;
1116 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1117 krb5_generate_random_keyblock(krb5_context context,
1121 krb5_error_code ret;
1122 struct encryption_type *et = _find_enctype(type);
1124 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
1125 N_("encryption type %d not supported", ""),
1127 return KRB5_PROG_ETYPE_NOSUPP;
1129 ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
1132 key->keytype = type;
1133 if(et->keytype->random_key)
1134 (*et->keytype->random_key)(context, key);
1136 krb5_generate_random_block(key->keyvalue.data,
1137 key->keyvalue.length);
1141 static krb5_error_code
1142 _key_schedule(krb5_context context,
1143 struct key_data *key)
1145 krb5_error_code ret;
1146 struct encryption_type *et = _find_enctype(key->key->keytype);
1147 struct key_type *kt;
1150 krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
1151 N_("encryption type %d not supported", ""),
1153 return KRB5_PROG_ETYPE_NOSUPP;
1158 if(kt->schedule == NULL)
1160 if (key->schedule != NULL)
1162 ALLOC(key->schedule, 1);
1163 if(key->schedule == NULL) {
1164 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
1167 ret = krb5_data_alloc(key->schedule, kt->schedule_size);
1169 free(key->schedule);
1170 key->schedule = NULL;
1173 (*kt->schedule)(context, kt, key);
1177 /************************************************************
1179 ************************************************************/
1181 static krb5_error_code
1182 NONE_checksum(krb5_context context,
1183 struct key_data *key,
1192 #if defined(DES3_OLD_ENCTYPE) || defined(HEIM_WEAK_CRYPTO)
1194 static krb5_error_code
1195 des_checksum(krb5_context context,
1196 const EVP_MD *evp_md,
1197 struct key_data *key,
1202 struct evp_schedule *ctx = key->schedule->data;
1205 unsigned char *p = cksum->checksum.data;
1207 krb5_generate_random_block(p, 8);
1209 m = EVP_MD_CTX_create();
1211 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
1215 EVP_DigestInit_ex(m, evp_md, NULL);
1216 EVP_DigestUpdate(m, p, 8);
1217 EVP_DigestUpdate(m, data, len);
1218 EVP_DigestFinal_ex (m, p + 8, NULL);
1219 EVP_MD_CTX_destroy(m);
1220 memset (&ivec, 0, sizeof(ivec));
1221 EVP_CipherInit_ex(&ctx->ectx, NULL, NULL, NULL, (void *)&ivec, -1);
1222 EVP_Cipher(&ctx->ectx, p, p, 24);
1227 static krb5_error_code
1228 des_verify(krb5_context context,
1229 const EVP_MD *evp_md,
1230 struct key_data *key,
1235 struct evp_schedule *ctx = key->schedule->data;
1237 unsigned char tmp[24];
1238 unsigned char res[16];
1240 krb5_error_code ret = 0;
1242 m = EVP_MD_CTX_create();
1244 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
1248 memset(&ivec, 0, sizeof(ivec));
1249 EVP_CipherInit_ex(&ctx->dctx, NULL, NULL, NULL, (void *)&ivec, -1);
1250 EVP_Cipher(&ctx->dctx, tmp, C->checksum.data, 24);
1252 EVP_DigestInit_ex(m, evp_md, NULL);
1253 EVP_DigestUpdate(m, tmp, 8); /* confounder */
1254 EVP_DigestUpdate(m, data, len);
1255 EVP_DigestFinal_ex (m, res, NULL);
1256 EVP_MD_CTX_destroy(m);
1257 if(ct_memcmp(res, tmp + 8, sizeof(res)) != 0) {
1258 krb5_clear_error_message (context);
1259 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1261 memset(tmp, 0, sizeof(tmp));
1262 memset(res, 0, sizeof(res));
1268 #ifdef HEIM_WEAK_CRYPTO
1270 static krb5_error_code
1271 CRC32_checksum(krb5_context context,
1272 struct key_data *key,
1279 unsigned char *r = C->checksum.data;
1280 _krb5_crc_init_table ();
1281 crc = _krb5_crc_update (data, len, 0);
1283 r[1] = (crc >> 8) & 0xff;
1284 r[2] = (crc >> 16) & 0xff;
1285 r[3] = (crc >> 24) & 0xff;
1289 static krb5_error_code
1290 RSA_MD4_checksum(krb5_context context,
1291 struct key_data *key,
1297 if (EVP_Digest(data, len, C->checksum.data, NULL, EVP_md4(), NULL) != 1)
1298 krb5_abortx(context, "md4 checksum failed");
1302 static krb5_error_code
1303 RSA_MD4_DES_checksum(krb5_context context,
1304 struct key_data *key,
1310 return des_checksum(context, EVP_md4(), key, data, len, cksum);
1313 static krb5_error_code
1314 RSA_MD4_DES_verify(krb5_context context,
1315 struct key_data *key,
1321 return des_verify(context, EVP_md5(), key, data, len, C);
1324 static krb5_error_code
1325 RSA_MD5_DES_checksum(krb5_context context,
1326 struct key_data *key,
1332 return des_checksum(context, EVP_md5(), key, data, len, C);
1335 static krb5_error_code
1336 RSA_MD5_DES_verify(krb5_context context,
1337 struct key_data *key,
1343 return des_verify(context, EVP_md5(), key, data, len, C);
1346 #endif /* HEIM_WEAK_CRYPTO */
1348 #ifdef DES3_OLD_ENCTYPE
1349 static krb5_error_code
1350 RSA_MD5_DES3_checksum(krb5_context context,
1351 struct key_data *key,
1357 return des_checksum(context, EVP_md5(), key, data, len, C);
1360 static krb5_error_code
1361 RSA_MD5_DES3_verify(krb5_context context,
1362 struct key_data *key,
1368 return des_verify(context, EVP_md5(), key, data, len, C);
1372 static krb5_error_code
1373 SHA1_checksum(krb5_context context,
1374 struct key_data *key,
1380 if (EVP_Digest(data, len, C->checksum.data, NULL, EVP_sha1(), NULL) != 1)
1381 krb5_abortx(context, "sha1 checksum failed");
1385 /* HMAC according to RFC2104 */
1386 static krb5_error_code
1387 hmac(krb5_context context,
1388 struct checksum_type *cm,
1392 struct key_data *keyblock,
1395 unsigned char *ipad, *opad;
1400 ipad = malloc(cm->blocksize + len);
1403 opad = malloc(cm->blocksize + cm->checksumsize);
1408 memset(ipad, 0x36, cm->blocksize);
1409 memset(opad, 0x5c, cm->blocksize);
1411 if(keyblock->key->keyvalue.length > cm->blocksize){
1412 (*cm->checksum)(context,
1414 keyblock->key->keyvalue.data,
1415 keyblock->key->keyvalue.length,
1418 key = result->checksum.data;
1419 key_len = result->checksum.length;
1421 key = keyblock->key->keyvalue.data;
1422 key_len = keyblock->key->keyvalue.length;
1424 for(i = 0; i < key_len; i++){
1428 memcpy(ipad + cm->blocksize, data, len);
1429 (*cm->checksum)(context, keyblock, ipad, cm->blocksize + len,
1431 memcpy(opad + cm->blocksize, result->checksum.data,
1432 result->checksum.length);
1433 (*cm->checksum)(context, keyblock, opad,
1434 cm->blocksize + cm->checksumsize, usage, result);
1435 memset(ipad, 0, cm->blocksize + len);
1437 memset(opad, 0, cm->blocksize + cm->checksumsize);
1443 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1444 krb5_hmac(krb5_context context,
1445 krb5_cksumtype cktype,
1452 struct checksum_type *c = _find_checksum(cktype);
1454 krb5_error_code ret;
1457 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
1458 N_("checksum type %d not supported", ""),
1460 return KRB5_PROG_SUMTYPE_NOSUPP;
1466 ret = hmac(context, c, data, len, usage, &kd, result);
1469 krb5_free_data(context, kd.schedule);
1474 static krb5_error_code
1475 SP_HMAC_SHA1_checksum(krb5_context context,
1476 struct key_data *key,
1482 struct checksum_type *c = _find_checksum(CKSUMTYPE_SHA1);
1485 krb5_error_code ret;
1487 res.checksum.data = sha1_data;
1488 res.checksum.length = sizeof(sha1_data);
1490 ret = hmac(context, c, data, len, usage, key, &res);
1492 krb5_abortx(context, "hmac failed");
1493 memcpy(result->checksum.data, res.checksum.data, result->checksum.length);
1498 * checksum according to section 5. of draft-brezak-win2k-krb-rc4-hmac-03.txt
1501 static krb5_error_code
1502 HMAC_MD5_checksum(krb5_context context,
1503 struct key_data *key,
1510 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
1511 const char signature[] = "signaturekey";
1513 struct key_data ksign;
1516 unsigned char tmp[16];
1517 unsigned char ksign_c_data[16];
1518 krb5_error_code ret;
1520 m = EVP_MD_CTX_create();
1522 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
1525 ksign_c.checksum.length = sizeof(ksign_c_data);
1526 ksign_c.checksum.data = ksign_c_data;
1527 ret = hmac(context, c, signature, sizeof(signature), 0, key, &ksign_c);
1529 EVP_MD_CTX_destroy(m);
1533 kb.keyvalue = ksign_c.checksum;
1534 EVP_DigestInit_ex(m, EVP_md5(), NULL);
1535 t[0] = (usage >> 0) & 0xFF;
1536 t[1] = (usage >> 8) & 0xFF;
1537 t[2] = (usage >> 16) & 0xFF;
1538 t[3] = (usage >> 24) & 0xFF;
1539 EVP_DigestUpdate(m, t, 4);
1540 EVP_DigestUpdate(m, data, len);
1541 EVP_DigestFinal_ex (m, tmp, NULL);
1542 EVP_MD_CTX_destroy(m);
1544 ret = hmac(context, c, tmp, sizeof(tmp), 0, &ksign, result);
1550 static struct checksum_type checksum_none = {
1559 #ifdef HEIM_WEAK_CRYPTO
1560 static struct checksum_type checksum_crc32 = {
1569 static struct checksum_type checksum_rsa_md4 = {
1578 static struct checksum_type checksum_rsa_md4_des = {
1579 CKSUMTYPE_RSA_MD4_DES,
1583 F_KEYED | F_CPROOF | F_VARIANT,
1584 RSA_MD4_DES_checksum,
1587 static struct checksum_type checksum_rsa_md5_des = {
1588 CKSUMTYPE_RSA_MD5_DES,
1592 F_KEYED | F_CPROOF | F_VARIANT,
1593 RSA_MD5_DES_checksum,
1596 #endif /* HEIM_WEAK_CRYPTO */
1598 static krb5_error_code
1599 RSA_MD5_checksum(krb5_context context,
1600 struct key_data *key,
1606 if (EVP_Digest(data, len, C->checksum.data, NULL, EVP_md5(), NULL) != 1)
1607 krb5_abortx(context, "md5 checksum failed");
1611 static struct checksum_type checksum_rsa_md5 = {
1621 #ifdef DES3_OLD_ENCTYPE
1622 static struct checksum_type checksum_rsa_md5_des3 = {
1623 CKSUMTYPE_RSA_MD5_DES3,
1627 F_KEYED | F_CPROOF | F_VARIANT,
1628 RSA_MD5_DES3_checksum,
1632 static struct checksum_type checksum_sha1 = {
1641 static struct checksum_type checksum_hmac_sha1_des3 = {
1642 CKSUMTYPE_HMAC_SHA1_DES3,
1646 F_KEYED | F_CPROOF | F_DERIVED,
1647 SP_HMAC_SHA1_checksum,
1651 static struct checksum_type checksum_hmac_sha1_aes128 = {
1652 CKSUMTYPE_HMAC_SHA1_96_AES_128,
1653 "hmac-sha1-96-aes128",
1656 F_KEYED | F_CPROOF | F_DERIVED,
1657 SP_HMAC_SHA1_checksum,
1661 static struct checksum_type checksum_hmac_sha1_aes256 = {
1662 CKSUMTYPE_HMAC_SHA1_96_AES_256,
1663 "hmac-sha1-96-aes256",
1666 F_KEYED | F_CPROOF | F_DERIVED,
1667 SP_HMAC_SHA1_checksum,
1671 static struct checksum_type checksum_hmac_md5 = {
1681 static struct checksum_type *checksum_types[] = {
1683 #ifdef HEIM_WEAK_CRYPTO
1686 &checksum_rsa_md4_des,
1687 &checksum_rsa_md5_des,
1689 #ifdef DES3_OLD_ENCTYPE
1690 &checksum_rsa_md5_des3,
1694 &checksum_hmac_sha1_des3,
1695 &checksum_hmac_sha1_aes128,
1696 &checksum_hmac_sha1_aes256,
1700 static int num_checksums = sizeof(checksum_types) / sizeof(checksum_types[0]);
1702 static struct checksum_type *
1703 _find_checksum(krb5_cksumtype type)
1706 for(i = 0; i < num_checksums; i++)
1707 if(checksum_types[i]->type == type)
1708 return checksum_types[i];
1712 static krb5_error_code
1713 get_checksum_key(krb5_context context,
1715 unsigned usage, /* not krb5_key_usage */
1716 struct checksum_type *ct,
1717 struct key_data **key)
1719 krb5_error_code ret = 0;
1721 if(ct->flags & F_DERIVED)
1722 ret = _get_derived_key(context, crypto, usage, key);
1723 else if(ct->flags & F_VARIANT) {
1726 *key = _new_derived_key(crypto, 0xff/* KRB5_KU_RFC1510_VARIANT */);
1728 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
1731 ret = krb5_copy_keyblock(context, crypto->key.key, &(*key)->key);
1734 for(i = 0; i < (*key)->key->keyvalue.length; i++)
1735 ((unsigned char*)(*key)->key->keyvalue.data)[i] ^= 0xF0;
1737 *key = &crypto->key;
1740 ret = _key_schedule(context, *key);
1744 static krb5_error_code
1745 create_checksum (krb5_context context,
1746 struct checksum_type *ct,
1753 krb5_error_code ret;
1754 struct key_data *dkey;
1757 if (ct->flags & F_DISABLED) {
1758 krb5_clear_error_message (context);
1759 return KRB5_PROG_SUMTYPE_NOSUPP;
1761 keyed_checksum = (ct->flags & F_KEYED) != 0;
1762 if(keyed_checksum && crypto == NULL) {
1763 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
1764 N_("Checksum type %s is keyed but no "
1765 "crypto context (key) was passed in", ""),
1767 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
1769 if(keyed_checksum) {
1770 ret = get_checksum_key(context, crypto, usage, ct, &dkey);
1775 result->cksumtype = ct->type;
1776 ret = krb5_data_alloc(&result->checksum, ct->checksumsize);
1779 return (*ct->checksum)(context, dkey, data, len, usage, result);
1783 arcfour_checksum_p(struct checksum_type *ct, krb5_crypto crypto)
1785 return (ct->type == CKSUMTYPE_HMAC_MD5) &&
1786 (crypto->key.key->keytype == KEYTYPE_ARCFOUR);
1789 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1790 krb5_create_checksum(krb5_context context,
1792 krb5_key_usage usage,
1798 struct checksum_type *ct = NULL;
1801 /* type 0 -> pick from crypto */
1803 ct = _find_checksum(type);
1804 } else if (crypto) {
1805 ct = crypto->et->keyed_checksum;
1807 ct = crypto->et->checksum;
1811 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
1812 N_("checksum type %d not supported", ""),
1814 return KRB5_PROG_SUMTYPE_NOSUPP;
1817 if (arcfour_checksum_p(ct, crypto)) {
1819 usage2arcfour(context, &keyusage);
1821 keyusage = CHECKSUM_USAGE(usage);
1823 return create_checksum(context, ct, crypto, keyusage,
1827 static krb5_error_code
1828 verify_checksum(krb5_context context,
1830 unsigned usage, /* not krb5_key_usage */
1835 krb5_error_code ret;
1836 struct key_data *dkey;
1839 struct checksum_type *ct;
1841 ct = _find_checksum(cksum->cksumtype);
1842 if (ct == NULL || (ct->flags & F_DISABLED)) {
1843 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
1844 N_("checksum type %d not supported", ""),
1846 return KRB5_PROG_SUMTYPE_NOSUPP;
1848 if(ct->checksumsize != cksum->checksum.length) {
1849 krb5_clear_error_message (context);
1850 krb5_set_error_message(context, KRB5KRB_AP_ERR_BAD_INTEGRITY,
1851 N_("Decrypt integrity check failed for checksum type %s, "
1852 "length was %u, expected %u", ""),
1853 ct->name, (unsigned)cksum->checksum.length,
1854 (unsigned)ct->checksumsize);
1856 return KRB5KRB_AP_ERR_BAD_INTEGRITY; /* XXX */
1858 keyed_checksum = (ct->flags & F_KEYED) != 0;
1859 if(keyed_checksum) {
1860 struct checksum_type *kct;
1861 if (crypto == NULL) {
1862 krb5_set_error_message(context, KRB5_PROG_SUMTYPE_NOSUPP,
1863 N_("Checksum type %s is keyed but no "
1864 "crypto context (key) was passed in", ""),
1866 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
1868 kct = crypto->et->keyed_checksum;
1869 if (kct != NULL && kct->type != ct->type) {
1870 krb5_set_error_message(context, KRB5_PROG_SUMTYPE_NOSUPP,
1871 N_("Checksum type %s is keyed, but "
1872 "the key type %s passed didnt have that checksum "
1873 "type as the keyed type", ""),
1874 ct->name, crypto->et->name);
1875 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
1878 ret = get_checksum_key(context, crypto, usage, ct, &dkey);
1885 * If checksum have a verify function, lets use that instead of
1886 * calling ->checksum and then compare result.
1890 ret = (*ct->verify)(context, dkey, data, len, usage, cksum);
1892 krb5_set_error_message(context, ret,
1893 N_("Decrypt integrity check failed for checksum "
1894 "type %s, key type %s", ""),
1895 ct->name, crypto->et->name);
1899 ret = krb5_data_alloc (&c.checksum, ct->checksumsize);
1903 ret = (*ct->checksum)(context, dkey, data, len, usage, &c);
1905 krb5_data_free(&c.checksum);
1909 if(c.checksum.length != cksum->checksum.length ||
1910 ct_memcmp(c.checksum.data, cksum->checksum.data, c.checksum.length)) {
1911 krb5_clear_error_message (context);
1912 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1913 krb5_set_error_message(context, ret,
1914 N_("Decrypt integrity check failed for checksum "
1915 "type %s, key type %s", ""),
1916 ct->name, crypto->et->name);
1920 krb5_data_free (&c.checksum);
1924 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1925 krb5_verify_checksum(krb5_context context,
1927 krb5_key_usage usage,
1932 struct checksum_type *ct;
1935 ct = _find_checksum(cksum->cksumtype);
1937 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
1938 N_("checksum type %d not supported", ""),
1940 return KRB5_PROG_SUMTYPE_NOSUPP;
1943 if (arcfour_checksum_p(ct, crypto)) {
1945 usage2arcfour(context, &keyusage);
1947 keyusage = CHECKSUM_USAGE(usage);
1949 return verify_checksum(context, crypto, keyusage,
1953 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1954 krb5_crypto_get_checksum_type(krb5_context context,
1956 krb5_cksumtype *type)
1958 struct checksum_type *ct = NULL;
1960 if (crypto != NULL) {
1961 ct = crypto->et->keyed_checksum;
1963 ct = crypto->et->checksum;
1967 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
1968 N_("checksum type not found", ""));
1969 return KRB5_PROG_SUMTYPE_NOSUPP;
1978 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1979 krb5_checksumsize(krb5_context context,
1980 krb5_cksumtype type,
1983 struct checksum_type *ct = _find_checksum(type);
1985 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
1986 N_("checksum type %d not supported", ""),
1988 return KRB5_PROG_SUMTYPE_NOSUPP;
1990 *size = ct->checksumsize;
1994 KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
1995 krb5_checksum_is_keyed(krb5_context context,
1996 krb5_cksumtype type)
1998 struct checksum_type *ct = _find_checksum(type);
2001 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
2002 N_("checksum type %d not supported", ""),
2004 return KRB5_PROG_SUMTYPE_NOSUPP;
2006 return ct->flags & F_KEYED;
2009 KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
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_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
2017 N_("checksum type %d not supported", ""),
2019 return KRB5_PROG_SUMTYPE_NOSUPP;
2021 return ct->flags & F_CPROOF;
2024 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2025 krb5_checksum_disable(krb5_context context,
2026 krb5_cksumtype type)
2028 struct checksum_type *ct = _find_checksum(type);
2031 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
2032 N_("checksum type %d not supported", ""),
2034 return KRB5_PROG_SUMTYPE_NOSUPP;
2036 ct->flags |= F_DISABLED;
2040 /************************************************************
2042 ************************************************************/
2044 static krb5_error_code
2045 NULL_encrypt(krb5_context context,
2046 struct key_data *key,
2049 krb5_boolean encryptp,
2056 static krb5_error_code
2057 evp_encrypt(krb5_context context,
2058 struct key_data *key,
2061 krb5_boolean encryptp,
2065 struct evp_schedule *ctx = key->schedule->data;
2067 c = encryptp ? &ctx->ectx : &ctx->dctx;
2070 size_t len2 = EVP_CIPHER_CTX_iv_length(c);
2071 void *loiv = malloc(len2);
2073 krb5_clear_error_message(context);
2076 memset(loiv, 0, len2);
2077 EVP_CipherInit_ex(c, NULL, NULL, NULL, loiv, -1);
2080 EVP_CipherInit_ex(c, NULL, NULL, NULL, ivec, -1);
2081 EVP_Cipher(c, data, data, len);
2085 static const unsigned char zero_ivec[EVP_MAX_BLOCK_LENGTH] = { 0 };
2087 static krb5_error_code
2088 evp_encrypt_cts(krb5_context context,
2089 struct key_data *key,
2092 krb5_boolean encryptp,
2096 size_t i, blocksize;
2097 struct evp_schedule *ctx = key->schedule->data;
2098 char tmp[EVP_MAX_BLOCK_LENGTH], ivec2[EVP_MAX_BLOCK_LENGTH];
2102 c = encryptp ? &ctx->ectx : &ctx->dctx;
2104 blocksize = EVP_CIPHER_CTX_block_size(c);
2106 if (len < blocksize) {
2107 krb5_set_error_message(context, EINVAL,
2108 "message block too short");
2110 } else if (len == blocksize) {
2111 EVP_CipherInit_ex(c, NULL, NULL, NULL, zero_ivec, -1);
2112 EVP_Cipher(c, data, data, len);
2117 EVP_CipherInit_ex(c, NULL, NULL, NULL, ivec, -1);
2119 EVP_CipherInit_ex(c, NULL, NULL, NULL, zero_ivec, -1);
2124 i = ((len - 1) / blocksize) * blocksize;
2125 EVP_Cipher(c, p, p, i);
2128 memcpy(ivec2, p, blocksize);
2130 for (i = 0; i < len; i++)
2131 tmp[i] = p[i + blocksize] ^ ivec2[i];
2132 for (; i < blocksize; i++)
2133 tmp[i] = 0 ^ ivec2[i];
2135 EVP_CipherInit_ex(c, NULL, NULL, NULL, zero_ivec, -1);
2136 EVP_Cipher(c, p, tmp, blocksize);
2138 memcpy(p + blocksize, ivec2, len);
2140 memcpy(ivec, p, blocksize);
2142 char tmp2[EVP_MAX_BLOCK_LENGTH], tmp3[EVP_MAX_BLOCK_LENGTH];
2145 if (len > blocksize * 2) {
2146 /* remove last two blocks and round up, decrypt this with cbc, then do cts dance */
2147 i = ((((len - blocksize * 2) + blocksize - 1) / blocksize) * blocksize);
2148 memcpy(ivec2, p + i - blocksize, blocksize);
2149 EVP_Cipher(c, p, p, i);
2151 len -= i + blocksize;
2154 memcpy(ivec2, ivec, blocksize);
2156 memcpy(ivec2, zero_ivec, blocksize);
2160 memcpy(tmp, p, blocksize);
2161 EVP_CipherInit_ex(c, NULL, NULL, NULL, zero_ivec, -1);
2162 EVP_Cipher(c, tmp2, p, blocksize);
2164 memcpy(tmp3, p + blocksize, len);
2165 memcpy(tmp3 + len, tmp2 + len, blocksize - len); /* xor 0 */
2167 for (i = 0; i < len; i++)
2168 p[i + blocksize] = tmp2[i] ^ tmp3[i];
2170 EVP_CipherInit_ex(c, NULL, NULL, NULL, zero_ivec, -1);
2171 EVP_Cipher(c, p, tmp3, blocksize);
2173 for (i = 0; i < blocksize; i++)
2176 memcpy(ivec, tmp, blocksize);
2181 #ifdef HEIM_WEAK_CRYPTO
2182 static krb5_error_code
2183 evp_des_encrypt_null_ivec(krb5_context context,
2184 struct key_data *key,
2187 krb5_boolean encryptp,
2191 struct evp_schedule *ctx = key->schedule->data;
2194 memset(&ivec, 0, sizeof(ivec));
2195 c = encryptp ? &ctx->ectx : &ctx->dctx;
2196 EVP_CipherInit_ex(c, NULL, NULL, NULL, (void *)&ivec, -1);
2197 EVP_Cipher(c, data, data, len);
2201 static krb5_error_code
2202 evp_des_encrypt_key_ivec(krb5_context context,
2203 struct key_data *key,
2206 krb5_boolean encryptp,
2210 struct evp_schedule *ctx = key->schedule->data;
2213 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
2214 c = encryptp ? &ctx->ectx : &ctx->dctx;
2215 EVP_CipherInit_ex(c, NULL, NULL, NULL, (void *)&ivec, -1);
2216 EVP_Cipher(c, data, data, len);
2220 static krb5_error_code
2221 DES_CFB64_encrypt_null_ivec(krb5_context context,
2222 struct key_data *key,
2225 krb5_boolean encryptp,
2231 DES_key_schedule *s = key->schedule->data;
2232 memset(&ivec, 0, sizeof(ivec));
2234 DES_cfb64_encrypt(data, data, len, s, &ivec, &num, encryptp);
2238 static krb5_error_code
2239 DES_PCBC_encrypt_key_ivec(krb5_context context,
2240 struct key_data *key,
2243 krb5_boolean encryptp,
2248 DES_key_schedule *s = key->schedule->data;
2249 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
2251 DES_pcbc_encrypt(data, data, len, s, &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,
2271 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
2272 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 EVP_CIPHER_CTX_init(&ctx);
2319 EVP_CipherInit_ex(&ctx, EVP_rc4(), NULL, k3_c.checksum.data, NULL, 1);
2320 EVP_Cipher(&ctx, cdata + 16, cdata + 16, len - 16);
2321 EVP_CIPHER_CTX_cleanup(&ctx);
2323 memset (k1_c_data, 0, sizeof(k1_c_data));
2324 memset (k2_c_data, 0, sizeof(k2_c_data));
2325 memset (k3_c_data, 0, sizeof(k3_c_data));
2329 static krb5_error_code
2330 ARCFOUR_subdecrypt(krb5_context context,
2331 struct key_data *key,
2338 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
2339 Checksum k1_c, k2_c, k3_c, cksum;
2343 unsigned char *cdata = data;
2344 unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
2345 unsigned char cksum_data[16];
2346 krb5_error_code ret;
2348 t[0] = (usage >> 0) & 0xFF;
2349 t[1] = (usage >> 8) & 0xFF;
2350 t[2] = (usage >> 16) & 0xFF;
2351 t[3] = (usage >> 24) & 0xFF;
2353 k1_c.checksum.length = sizeof(k1_c_data);
2354 k1_c.checksum.data = k1_c_data;
2356 ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
2358 krb5_abortx(context, "hmac failed");
2360 memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
2362 k2_c.checksum.length = sizeof(k2_c_data);
2363 k2_c.checksum.data = k2_c_data;
2366 kb.keyvalue = k1_c.checksum;
2368 k3_c.checksum.length = sizeof(k3_c_data);
2369 k3_c.checksum.data = k3_c_data;
2371 ret = hmac(NULL, c, cdata, 16, 0, &ke, &k3_c);
2373 krb5_abortx(context, "hmac failed");
2375 EVP_CIPHER_CTX_init(&ctx);
2376 EVP_CipherInit_ex(&ctx, EVP_rc4(), NULL, k3_c.checksum.data, NULL, 0);
2377 EVP_Cipher(&ctx, cdata + 16, cdata + 16, len - 16);
2378 EVP_CIPHER_CTX_cleanup(&ctx);
2381 kb.keyvalue = k2_c.checksum;
2383 cksum.checksum.length = 16;
2384 cksum.checksum.data = cksum_data;
2386 ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
2388 krb5_abortx(context, "hmac failed");
2390 memset (k1_c_data, 0, sizeof(k1_c_data));
2391 memset (k2_c_data, 0, sizeof(k2_c_data));
2392 memset (k3_c_data, 0, sizeof(k3_c_data));
2394 if (ct_memcmp (cksum.checksum.data, data, 16) != 0) {
2395 krb5_clear_error_message (context);
2396 return KRB5KRB_AP_ERR_BAD_INTEGRITY;
2403 * convert the usage numbers used in
2404 * draft-ietf-cat-kerb-key-derivation-00.txt to the ones in
2405 * draft-brezak-win2k-krb-rc4-hmac-04.txt
2408 static krb5_error_code
2409 usage2arcfour (krb5_context context, unsigned *usage)
2412 case KRB5_KU_AS_REP_ENC_PART : /* 3 */
2415 case KRB5_KU_USAGE_SEAL : /* 22 */
2418 case KRB5_KU_USAGE_SIGN : /* 23 */
2421 case KRB5_KU_USAGE_SEQ: /* 24 */
2429 static krb5_error_code
2430 ARCFOUR_encrypt(krb5_context context,
2431 struct key_data *key,
2434 krb5_boolean encryptp,
2438 krb5_error_code ret;
2439 unsigned keyusage = usage;
2441 if((ret = usage2arcfour (context, &keyusage)) != 0)
2445 return ARCFOUR_subencrypt (context, key, data, len, keyusage, ivec);
2447 return ARCFOUR_subdecrypt (context, key, data, len, keyusage, ivec);
2455 static krb5_error_code
2456 AES_PRF(krb5_context context,
2458 const krb5_data *in,
2461 struct checksum_type *ct = crypto->et->checksum;
2462 krb5_error_code ret;
2464 krb5_keyblock *derived;
2466 result.cksumtype = ct->type;
2467 ret = krb5_data_alloc(&result.checksum, ct->checksumsize);
2469 krb5_set_error_message(context, ret, N_("malloc: out memory", ""));
2473 ret = (*ct->checksum)(context, NULL, in->data, in->length, 0, &result);
2475 krb5_data_free(&result.checksum);
2479 if (result.checksum.length < crypto->et->blocksize)
2480 krb5_abortx(context, "internal prf error");
2483 ret = krb5_derive_key(context, crypto->key.key,
2484 crypto->et->type, "prf", 3, &derived);
2486 krb5_abortx(context, "krb5_derive_key");
2488 ret = krb5_data_alloc(out, crypto->et->blocksize);
2490 krb5_abortx(context, "malloc failed");
2493 const EVP_CIPHER *c = (*crypto->et->keytype->evp)();
2496 EVP_CIPHER_CTX_init(&ctx); /* ivec all zero */
2497 EVP_CipherInit_ex(&ctx, c, NULL, derived->keyvalue.data, NULL, 1);
2498 EVP_Cipher(&ctx, out->data, result.checksum.data,
2499 crypto->et->blocksize);
2500 EVP_CIPHER_CTX_cleanup(&ctx);
2503 krb5_data_free(&result.checksum);
2504 krb5_free_keyblock(context, derived);
2510 * these should currently be in reverse preference order.
2511 * (only relevant for !F_PSEUDO) */
2513 static struct encryption_type enctype_null = {
2527 static struct encryption_type enctype_arcfour_hmac_md5 = {
2528 ETYPE_ARCFOUR_HMAC_MD5,
2541 #ifdef DES3_OLD_ENCTYPE
2542 static struct encryption_type enctype_des3_cbc_md5 = {
2550 &checksum_rsa_md5_des3,
2557 static struct encryption_type enctype_des3_cbc_sha1 = {
2558 ETYPE_DES3_CBC_SHA1,
2563 &keytype_des3_derived,
2565 &checksum_hmac_sha1_des3,
2571 #ifdef DES3_OLD_ENCTYPE
2572 static struct encryption_type enctype_old_des3_cbc_sha1 = {
2573 ETYPE_OLD_DES3_CBC_SHA1,
2574 "old-des3-cbc-sha1",
2580 &checksum_hmac_sha1_des3,
2587 static struct encryption_type enctype_aes128_cts_hmac_sha1 = {
2588 ETYPE_AES128_CTS_HMAC_SHA1_96,
2589 "aes128-cts-hmac-sha1-96",
2595 &checksum_hmac_sha1_aes128,
2601 static struct encryption_type enctype_aes256_cts_hmac_sha1 = {
2602 ETYPE_AES256_CTS_HMAC_SHA1_96,
2603 "aes256-cts-hmac-sha1-96",
2609 &checksum_hmac_sha1_aes256,
2615 static struct encryption_type enctype_des3_cbc_none = {
2616 ETYPE_DES3_CBC_NONE,
2621 &keytype_des3_derived,
2629 #ifdef HEIM_WEAK_CRYPTO
2630 static struct encryption_type enctype_des_cbc_crc = {
2640 evp_des_encrypt_key_ivec,
2644 static struct encryption_type enctype_des_cbc_md4 = {
2652 &checksum_rsa_md4_des,
2654 evp_des_encrypt_null_ivec,
2658 static struct encryption_type enctype_des_cbc_md5 = {
2666 &checksum_rsa_md5_des,
2668 evp_des_encrypt_null_ivec,
2672 static struct encryption_type enctype_des_cbc_none = {
2681 F_PSEUDO|F_DISABLED|F_WEAK,
2682 evp_des_encrypt_null_ivec,
2686 static struct encryption_type enctype_des_cfb64_none = {
2687 ETYPE_DES_CFB64_NONE,
2695 F_PSEUDO|F_DISABLED|F_WEAK,
2696 DES_CFB64_encrypt_null_ivec,
2700 static struct encryption_type enctype_des_pcbc_none = {
2701 ETYPE_DES_PCBC_NONE,
2709 F_PSEUDO|F_DISABLED|F_WEAK,
2710 DES_PCBC_encrypt_key_ivec,
2714 #endif /* HEIM_WEAK_CRYPTO */
2716 static struct encryption_type *etypes[] = {
2717 &enctype_aes256_cts_hmac_sha1,
2718 &enctype_aes128_cts_hmac_sha1,
2719 &enctype_des3_cbc_sha1,
2720 &enctype_des3_cbc_none, /* used by the gss-api mech */
2721 &enctype_arcfour_hmac_md5,
2722 #ifdef DES3_OLD_ENCTYPE
2723 &enctype_des3_cbc_md5,
2724 &enctype_old_des3_cbc_sha1,
2726 #ifdef HEIM_WEAK_CRYPTO
2727 &enctype_des_cbc_crc,
2728 &enctype_des_cbc_md4,
2729 &enctype_des_cbc_md5,
2730 &enctype_des_cbc_none,
2731 &enctype_des_cfb64_none,
2732 &enctype_des_pcbc_none,
2737 static unsigned num_etypes = sizeof(etypes) / sizeof(etypes[0]);
2740 static struct encryption_type *
2741 _find_enctype(krb5_enctype type)
2744 for(i = 0; i < num_etypes; i++)
2745 if(etypes[i]->type == type)
2751 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2752 krb5_enctype_to_string(krb5_context context,
2756 struct encryption_type *e;
2757 e = _find_enctype(etype);
2759 krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
2760 N_("encryption type %d not supported", ""),
2763 return KRB5_PROG_ETYPE_NOSUPP;
2765 *string = strdup(e->name);
2766 if(*string == NULL) {
2767 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
2773 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2774 krb5_string_to_enctype(krb5_context context,
2776 krb5_enctype *etype)
2779 for(i = 0; i < num_etypes; i++)
2780 if(strcasecmp(etypes[i]->name, string) == 0){
2781 *etype = etypes[i]->type;
2784 krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
2785 N_("encryption type %s not supported", ""),
2787 return KRB5_PROG_ETYPE_NOSUPP;
2790 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2791 krb5_enctype_to_keytype(krb5_context context,
2793 krb5_keytype *keytype)
2795 struct encryption_type *e = _find_enctype(etype);
2797 krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
2798 N_("encryption type %d not supported", ""),
2800 return KRB5_PROG_ETYPE_NOSUPP;
2802 *keytype = e->keytype->type; /* XXX */
2806 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2807 krb5_enctype_valid(krb5_context context,
2810 struct encryption_type *e = _find_enctype(etype);
2812 krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
2813 N_("encryption type %d not supported", ""),
2815 return KRB5_PROG_ETYPE_NOSUPP;
2817 if (e->flags & F_DISABLED) {
2818 krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
2819 N_("encryption type %s is disabled", ""),
2821 return KRB5_PROG_ETYPE_NOSUPP;
2827 * Return the coresponding encryption type for a checksum type.
2829 * @param context Kerberos context
2830 * @param ctype The checksum type to get the result enctype for
2831 * @param etype The returned encryption, when the matching etype is
2832 * not found, etype is set to ETYPE_NULL.
2834 * @return Return an error code for an failure or 0 on success.
2835 * @ingroup krb5_crypto
2839 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2840 krb5_cksumtype_to_enctype(krb5_context context,
2841 krb5_cksumtype ctype,
2842 krb5_enctype *etype)
2846 *etype = ETYPE_NULL;
2848 for(i = 0; i < num_etypes; i++) {
2849 if(etypes[i]->keyed_checksum &&
2850 etypes[i]->keyed_checksum->type == ctype)
2852 *etype = etypes[i]->type;
2857 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
2858 N_("checksum type %d not supported", ""),
2860 return KRB5_PROG_SUMTYPE_NOSUPP;
2864 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2865 krb5_cksumtype_valid(krb5_context context,
2866 krb5_cksumtype ctype)
2868 struct checksum_type *c = _find_checksum(ctype);
2870 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
2871 N_("checksum type %d not supported", ""),
2873 return KRB5_PROG_SUMTYPE_NOSUPP;
2875 if (c->flags & F_DISABLED) {
2876 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
2877 N_("checksum type %s is disabled", ""),
2879 return KRB5_PROG_SUMTYPE_NOSUPP;
2886 derived_crypto(krb5_context context,
2889 return (crypto->et->flags & F_DERIVED) != 0;
2893 special_crypto(krb5_context context,
2896 return (crypto->et->flags & F_SPECIAL) != 0;
2899 #define CHECKSUMSIZE(C) ((C)->checksumsize)
2900 #define CHECKSUMTYPE(C) ((C)->type)
2902 static krb5_error_code
2903 encrypt_internal_derived(krb5_context context,
2911 size_t sz, block_sz, checksum_sz, total_sz;
2913 unsigned char *p, *q;
2914 krb5_error_code ret;
2915 struct key_data *dkey;
2916 const struct encryption_type *et = crypto->et;
2918 checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
2920 sz = et->confoundersize + len;
2921 block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
2922 total_sz = block_sz + checksum_sz;
2923 p = calloc(1, total_sz);
2925 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
2930 krb5_generate_random_block(q, et->confoundersize); /* XXX */
2931 q += et->confoundersize;
2932 memcpy(q, data, len);
2934 ret = create_checksum(context,
2937 INTEGRITY_USAGE(usage),
2941 if(ret == 0 && cksum.checksum.length != checksum_sz) {
2942 free_Checksum (&cksum);
2943 krb5_clear_error_message (context);
2944 ret = KRB5_CRYPTO_INTERNAL;
2948 memcpy(p + block_sz, cksum.checksum.data, cksum.checksum.length);
2949 free_Checksum (&cksum);
2950 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
2953 ret = _key_schedule(context, dkey);
2956 ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec);
2960 result->length = total_sz;
2963 memset(p, 0, total_sz);
2969 static krb5_error_code
2970 encrypt_internal(krb5_context context,
2977 size_t sz, block_sz, checksum_sz;
2979 unsigned char *p, *q;
2980 krb5_error_code ret;
2981 const struct encryption_type *et = crypto->et;
2983 checksum_sz = CHECKSUMSIZE(et->checksum);
2985 sz = et->confoundersize + checksum_sz + len;
2986 block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
2987 p = calloc(1, block_sz);
2989 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
2994 krb5_generate_random_block(q, et->confoundersize); /* XXX */
2995 q += et->confoundersize;
2996 memset(q, 0, checksum_sz);
2998 memcpy(q, data, len);
3000 ret = create_checksum(context,
3007 if(ret == 0 && cksum.checksum.length != checksum_sz) {
3008 krb5_clear_error_message (context);
3009 free_Checksum(&cksum);
3010 ret = KRB5_CRYPTO_INTERNAL;
3014 memcpy(p + et->confoundersize, cksum.checksum.data, cksum.checksum.length);
3015 free_Checksum(&cksum);
3016 ret = _key_schedule(context, &crypto->key);
3019 ret = (*et->encrypt)(context, &crypto->key, p, block_sz, 1, 0, ivec);
3021 memset(p, 0, block_sz);
3026 result->length = block_sz;
3029 memset(p, 0, block_sz);
3034 static krb5_error_code
3035 encrypt_internal_special(krb5_context context,
3043 struct encryption_type *et = crypto->et;
3044 size_t cksum_sz = CHECKSUMSIZE(et->checksum);
3045 size_t sz = len + cksum_sz + et->confoundersize;
3047 krb5_error_code ret;
3051 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
3055 memset (p, 0, cksum_sz);
3057 krb5_generate_random_block(p, et->confoundersize);
3058 p += et->confoundersize;
3059 memcpy (p, data, len);
3060 ret = (*et->encrypt)(context, &crypto->key, tmp, sz, TRUE, usage, ivec);
3067 result->length = sz;
3071 static krb5_error_code
3072 decrypt_internal_derived(krb5_context context,
3083 krb5_error_code ret;
3084 struct key_data *dkey;
3085 struct encryption_type *et = crypto->et;
3088 checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
3089 if (len < checksum_sz + et->confoundersize) {
3090 krb5_set_error_message(context, KRB5_BAD_MSIZE,
3091 N_("Encrypted data shorter then "
3092 "checksum + confunder", ""));
3093 return KRB5_BAD_MSIZE;
3096 if (((len - checksum_sz) % et->padsize) != 0) {
3097 krb5_clear_error_message(context);
3098 return KRB5_BAD_MSIZE;
3102 if(len != 0 && p == NULL) {
3103 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
3106 memcpy(p, data, len);
3110 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
3115 ret = _key_schedule(context, dkey);
3120 ret = (*et->encrypt)(context, dkey, p, len, 0, usage, ivec);
3126 cksum.checksum.data = p + len;
3127 cksum.checksum.length = checksum_sz;
3128 cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
3130 ret = verify_checksum(context,
3132 INTEGRITY_USAGE(usage),
3140 l = len - et->confoundersize;
3141 memmove(p, p + et->confoundersize, l);
3142 result->data = realloc(p, l);
3143 if(result->data == NULL && l != 0) {
3145 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
3152 static krb5_error_code
3153 decrypt_internal(krb5_context context,
3160 krb5_error_code ret;
3163 size_t checksum_sz, l;
3164 struct encryption_type *et = crypto->et;
3166 if ((len % et->padsize) != 0) {
3167 krb5_clear_error_message(context);
3168 return KRB5_BAD_MSIZE;
3170 checksum_sz = CHECKSUMSIZE(et->checksum);
3171 if (len < checksum_sz + et->confoundersize) {
3172 krb5_set_error_message(context, KRB5_BAD_MSIZE,
3173 N_("Encrypted data shorter then "
3174 "checksum + confunder", ""));
3175 return KRB5_BAD_MSIZE;
3179 if(len != 0 && p == NULL) {
3180 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
3183 memcpy(p, data, len);
3185 ret = _key_schedule(context, &crypto->key);
3190 ret = (*et->encrypt)(context, &crypto->key, p, len, 0, 0, ivec);
3195 ret = krb5_data_copy(&cksum.checksum, p + et->confoundersize, checksum_sz);
3200 memset(p + et->confoundersize, 0, checksum_sz);
3201 cksum.cksumtype = CHECKSUMTYPE(et->checksum);
3202 ret = verify_checksum(context, NULL, 0, p, len, &cksum);
3203 free_Checksum(&cksum);
3208 l = len - et->confoundersize - checksum_sz;
3209 memmove(p, p + et->confoundersize + checksum_sz, l);
3210 result->data = realloc(p, l);
3211 if(result->data == NULL && l != 0) {
3213 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
3220 static krb5_error_code
3221 decrypt_internal_special(krb5_context context,
3229 struct encryption_type *et = crypto->et;
3230 size_t cksum_sz = CHECKSUMSIZE(et->checksum);
3231 size_t sz = len - cksum_sz - et->confoundersize;
3233 krb5_error_code ret;
3235 if ((len % et->padsize) != 0) {
3236 krb5_clear_error_message(context);
3237 return KRB5_BAD_MSIZE;
3239 if (len < cksum_sz + et->confoundersize) {
3240 krb5_set_error_message(context, KRB5_BAD_MSIZE,
3241 N_("Encrypted data shorter then "
3242 "checksum + confunder", ""));
3243 return KRB5_BAD_MSIZE;
3248 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
3251 memcpy(p, data, len);
3253 ret = (*et->encrypt)(context, &crypto->key, p, len, FALSE, usage, ivec);
3259 memmove (p, p + cksum_sz + et->confoundersize, sz);
3260 result->data = realloc(p, sz);
3261 if(result->data == NULL && sz != 0) {
3263 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
3266 result->length = sz;
3270 static krb5_crypto_iov *
3271 find_iv(krb5_crypto_iov *data, int num_data, int type)
3274 for (i = 0; i < num_data; i++)
3275 if (data[i].flags == type)
3281 * Inline encrypt a kerberos message
3283 * @param context Kerberos context
3284 * @param crypto Kerberos crypto context
3285 * @param usage Key usage for this buffer
3286 * @param data array of buffers to process
3287 * @param num_data length of array
3288 * @param ivec initial cbc/cts vector
3290 * @return Return an error code or 0.
3291 * @ingroup krb5_crypto
3293 * Kerberos encrypted data look like this:
3295 * 1. KRB5_CRYPTO_TYPE_HEADER
3296 * 2. array [1,...] KRB5_CRYPTO_TYPE_DATA and array [0,...]
3297 * KRB5_CRYPTO_TYPE_SIGN_ONLY in any order, however the receiver
3298 * have to aware of the order. KRB5_CRYPTO_TYPE_SIGN_ONLY is
3299 * commonly used headers and trailers.
3300 * 3. KRB5_CRYPTO_TYPE_PADDING, at least on padsize long if padsize > 1
3301 * 4. KRB5_CRYPTO_TYPE_TRAILER
3304 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3305 krb5_encrypt_iov_ivec(krb5_context context,
3308 krb5_crypto_iov *data,
3312 size_t headersz, trailersz, len;
3314 size_t sz, block_sz, pad_sz;
3316 unsigned char *p, *q;
3317 krb5_error_code ret;
3318 struct key_data *dkey;
3319 const struct encryption_type *et = crypto->et;
3320 krb5_crypto_iov *tiv, *piv, *hiv;
3323 krb5_clear_error_message(context);
3324 return KRB5_CRYPTO_INTERNAL;
3327 if(!derived_crypto(context, crypto)) {
3328 krb5_clear_error_message(context);
3329 return KRB5_CRYPTO_INTERNAL;
3332 headersz = et->confoundersize;
3333 trailersz = CHECKSUMSIZE(et->keyed_checksum);
3335 for (len = 0, i = 0; i < num_data; i++) {
3336 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
3338 len += data[i].data.length;
3341 sz = headersz + len;
3342 block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
3344 pad_sz = block_sz - sz;
3348 hiv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_HEADER);
3349 if (hiv == NULL || hiv->data.length != headersz)
3350 return KRB5_BAD_MSIZE;
3352 krb5_generate_random_block(hiv->data.data, hiv->data.length);
3355 piv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_PADDING);
3356 /* its ok to have no TYPE_PADDING if there is no padding */
3357 if (piv == NULL && pad_sz != 0)
3358 return KRB5_BAD_MSIZE;
3360 if (piv->data.length < pad_sz)
3361 return KRB5_BAD_MSIZE;
3362 piv->data.length = pad_sz;
3364 memset(piv->data.data, pad_sz, pad_sz);
3370 tiv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_TRAILER);
3371 if (tiv == NULL || tiv->data.length != trailersz)
3372 return KRB5_BAD_MSIZE;
3375 * XXX replace with EVP_Sign? at least make create_checksum an iov
3377 * XXX CTS EVP is broken, can't handle multi buffers :(
3381 for (i = 0; i < num_data; i++) {
3382 if (data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
3384 len += data[i].data.length;
3387 p = q = malloc(len);
3389 memcpy(q, hiv->data.data, hiv->data.length);
3390 q += hiv->data.length;
3391 for (i = 0; i < num_data; i++) {
3392 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
3393 data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
3395 memcpy(q, data[i].data.data, data[i].data.length);
3396 q += data[i].data.length;
3399 memset(q, 0, piv->data.length);
3401 ret = create_checksum(context,
3404 INTEGRITY_USAGE(usage),
3409 if(ret == 0 && cksum.checksum.length != trailersz) {
3410 free_Checksum (&cksum);
3411 krb5_clear_error_message (context);
3412 ret = KRB5_CRYPTO_INTERNAL;
3417 /* save cksum at end */
3418 memcpy(tiv->data.data, cksum.checksum.data, cksum.checksum.length);
3419 free_Checksum (&cksum);
3421 /* XXX replace with EVP_Cipher */
3422 p = q = malloc(block_sz);
3426 memcpy(q, hiv->data.data, hiv->data.length);
3427 q += hiv->data.length;
3429 for (i = 0; i < num_data; i++) {
3430 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
3432 memcpy(q, data[i].data.data, data[i].data.length);
3433 q += data[i].data.length;
3436 memset(q, 0, piv->data.length);
3439 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
3444 ret = _key_schedule(context, dkey);
3450 ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec);
3456 /* now copy data back to buffers */
3459 memcpy(hiv->data.data, q, hiv->data.length);
3460 q += hiv->data.length;
3462 for (i = 0; i < num_data; i++) {
3463 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
3465 memcpy(data[i].data.data, q, data[i].data.length);
3466 q += data[i].data.length;
3469 memcpy(piv->data.data, q, pad_sz);
3477 * Inline decrypt a Kerberos message.
3479 * @param context Kerberos context
3480 * @param crypto Kerberos crypto context
3481 * @param usage Key usage for this buffer
3482 * @param data array of buffers to process
3483 * @param num_data length of array
3484 * @param ivec initial cbc/cts vector
3486 * @return Return an error code or 0.
3487 * @ingroup krb5_crypto
3489 * 1. KRB5_CRYPTO_TYPE_HEADER
3490 * 2. one KRB5_CRYPTO_TYPE_DATA and array [0,...] of KRB5_CRYPTO_TYPE_SIGN_ONLY in
3491 * any order, however the receiver have to aware of the
3492 * order. KRB5_CRYPTO_TYPE_SIGN_ONLY is commonly used unencrypoted
3493 * protocol headers and trailers. The output data will be of same
3494 * size as the input data or shorter.
3497 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3498 krb5_decrypt_iov_ivec(krb5_context context,
3501 krb5_crypto_iov *data,
3502 unsigned int num_data,
3506 size_t headersz, trailersz, len;
3508 unsigned char *p, *q;
3509 krb5_error_code ret;
3510 struct key_data *dkey;
3511 struct encryption_type *et = crypto->et;
3512 krb5_crypto_iov *tiv, *hiv;
3515 krb5_clear_error_message(context);
3516 return KRB5_CRYPTO_INTERNAL;
3519 if(!derived_crypto(context, crypto)) {
3520 krb5_clear_error_message(context);
3521 return KRB5_CRYPTO_INTERNAL;
3524 headersz = et->confoundersize;
3526 hiv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_HEADER);
3527 if (hiv == NULL || hiv->data.length != headersz)
3528 return KRB5_BAD_MSIZE;
3531 trailersz = CHECKSUMSIZE(et->keyed_checksum);
3533 tiv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_TRAILER);
3534 if (tiv->data.length != trailersz)
3535 return KRB5_BAD_MSIZE;
3537 /* Find length of data we will decrypt */
3540 for (i = 0; i < num_data; i++) {
3541 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
3543 len += data[i].data.length;
3546 if ((len % et->padsize) != 0) {
3547 krb5_clear_error_message(context);
3548 return KRB5_BAD_MSIZE;
3551 /* XXX replace with EVP_Cipher */
3553 p = q = malloc(len);
3557 memcpy(q, hiv->data.data, hiv->data.length);
3558 q += hiv->data.length;
3560 for (i = 0; i < num_data; i++) {
3561 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
3563 memcpy(q, data[i].data.data, data[i].data.length);
3564 q += data[i].data.length;
3567 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
3572 ret = _key_schedule(context, dkey);
3578 ret = (*et->encrypt)(context, dkey, p, len, 0, usage, ivec);
3584 /* copy data back to buffers */
3585 memcpy(hiv->data.data, p, hiv->data.length);
3586 q = p + hiv->data.length;
3587 for (i = 0; i < num_data; i++) {
3588 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
3590 memcpy(data[i].data.data, q, data[i].data.length);
3591 q += data[i].data.length;
3596 /* check signature */
3597 for (i = 0; i < num_data; i++) {
3598 if (data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
3600 len += data[i].data.length;
3603 p = q = malloc(len);
3607 memcpy(q, hiv->data.data, hiv->data.length);
3608 q += hiv->data.length;
3609 for (i = 0; i < num_data; i++) {
3610 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
3611 data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
3613 memcpy(q, data[i].data.data, data[i].data.length);
3614 q += data[i].data.length;
3617 cksum.checksum.data = tiv->data.data;
3618 cksum.checksum.length = tiv->data.length;
3619 cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
3621 ret = verify_checksum(context,
3623 INTEGRITY_USAGE(usage),
3632 * Create a Kerberos message checksum.
3634 * @param context Kerberos context
3635 * @param crypto Kerberos crypto context
3636 * @param usage Key usage for this buffer
3637 * @param data array of buffers to process
3638 * @param num_data length of array
3639 * @param type output data
3641 * @return Return an error code or 0.
3642 * @ingroup krb5_crypto
3645 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3646 krb5_create_checksum_iov(krb5_context context,
3649 krb5_crypto_iov *data,
3650 unsigned int num_data,
3651 krb5_cksumtype *type)
3654 krb5_crypto_iov *civ;
3655 krb5_error_code ret;
3661 krb5_clear_error_message(context);
3662 return KRB5_CRYPTO_INTERNAL;
3665 if(!derived_crypto(context, crypto)) {
3666 krb5_clear_error_message(context);
3667 return KRB5_CRYPTO_INTERNAL;
3670 civ = find_iv(data, num_data, KRB5_CRYPTO_TYPE_CHECKSUM);
3672 return KRB5_BAD_MSIZE;
3675 for (i = 0; i < num_data; i++) {
3676 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
3677 data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
3679 len += data[i].data.length;
3682 p = q = malloc(len);
3684 for (i = 0; i < num_data; i++) {
3685 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
3686 data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
3688 memcpy(q, data[i].data.data, data[i].data.length);
3689 q += data[i].data.length;
3692 ret = krb5_create_checksum(context, crypto, usage, 0, p, len, &cksum);
3698 *type = cksum.cksumtype;
3700 if (cksum.checksum.length > civ->data.length) {
3701 krb5_set_error_message(context, KRB5_BAD_MSIZE,
3702 N_("Checksum larger then input buffer", ""));
3703 free_Checksum(&cksum);
3704 return KRB5_BAD_MSIZE;
3707 civ->data.length = cksum.checksum.length;
3708 memcpy(civ->data.data, cksum.checksum.data, civ->data.length);
3709 free_Checksum(&cksum);
3715 * Verify a Kerberos message checksum.
3717 * @param context Kerberos context
3718 * @param crypto Kerberos crypto context
3719 * @param usage Key usage for this buffer
3720 * @param data array of buffers to process
3721 * @param num_data length of array
3722 * @param type return checksum type if not NULL
3724 * @return Return an error code or 0.
3725 * @ingroup krb5_crypto
3728 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3729 krb5_verify_checksum_iov(krb5_context context,
3732 krb5_crypto_iov *data,
3733 unsigned int num_data,
3734 krb5_cksumtype *type)
3736 struct encryption_type *et = crypto->et;
3738 krb5_crypto_iov *civ;
3739 krb5_error_code ret;
3745 krb5_clear_error_message(context);
3746 return KRB5_CRYPTO_INTERNAL;
3749 if(!derived_crypto(context, crypto)) {
3750 krb5_clear_error_message(context);
3751 return KRB5_CRYPTO_INTERNAL;
3754 civ = find_iv(data, num_data, KRB5_CRYPTO_TYPE_CHECKSUM);
3756 return KRB5_BAD_MSIZE;
3759 for (i = 0; i < num_data; i++) {
3760 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
3761 data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
3763 len += data[i].data.length;
3766 p = q = malloc(len);
3768 for (i = 0; i < num_data; i++) {
3769 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
3770 data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
3772 memcpy(q, data[i].data.data, data[i].data.length);
3773 q += data[i].data.length;
3776 cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
3777 cksum.checksum.length = civ->data.length;
3778 cksum.checksum.data = civ->data.data;
3780 ret = krb5_verify_checksum(context, crypto, usage, p, len, &cksum);
3783 if (ret == 0 && type)
3784 *type = cksum.cksumtype;
3790 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3791 krb5_crypto_length(krb5_context context,
3796 if (!derived_crypto(context, crypto)) {
3797 krb5_set_error_message(context, EINVAL, "not a derived crypto");
3802 case KRB5_CRYPTO_TYPE_EMPTY:
3805 case KRB5_CRYPTO_TYPE_HEADER:
3806 *len = crypto->et->blocksize;
3808 case KRB5_CRYPTO_TYPE_DATA:
3809 case KRB5_CRYPTO_TYPE_SIGN_ONLY:
3810 /* len must already been filled in */
3812 case KRB5_CRYPTO_TYPE_PADDING:
3813 if (crypto->et->padsize > 1)
3814 *len = crypto->et->padsize;
3818 case KRB5_CRYPTO_TYPE_TRAILER:
3819 *len = CHECKSUMSIZE(crypto->et->keyed_checksum);
3821 case KRB5_CRYPTO_TYPE_CHECKSUM:
3822 if (crypto->et->keyed_checksum)
3823 *len = CHECKSUMSIZE(crypto->et->keyed_checksum);
3825 *len = CHECKSUMSIZE(crypto->et->checksum);
3828 krb5_set_error_message(context, EINVAL,
3829 "%d not a supported type", type);
3834 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3835 krb5_crypto_length_iov(krb5_context context,
3837 krb5_crypto_iov *data,
3838 unsigned int num_data)
3840 krb5_error_code ret;
3843 for (i = 0; i < num_data; i++) {
3844 ret = krb5_crypto_length(context, crypto,
3846 &data[i].data.length);
3854 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3855 krb5_encrypt_ivec(krb5_context context,
3863 if(derived_crypto(context, crypto))
3864 return encrypt_internal_derived(context, crypto, usage,
3865 data, len, result, ivec);
3866 else if (special_crypto(context, crypto))
3867 return encrypt_internal_special (context, crypto, usage,
3868 data, len, result, ivec);
3870 return encrypt_internal(context, crypto, data, len, result, ivec);
3873 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3874 krb5_encrypt(krb5_context context,
3881 return krb5_encrypt_ivec(context, crypto, usage, data, len, result, NULL);
3884 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3885 krb5_encrypt_EncryptedData(krb5_context context,
3891 EncryptedData *result)
3893 result->etype = CRYPTO_ETYPE(crypto);
3895 ALLOC(result->kvno, 1);
3896 *result->kvno = kvno;
3898 result->kvno = NULL;
3899 return krb5_encrypt(context, crypto, usage, data, len, &result->cipher);
3902 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3903 krb5_decrypt_ivec(krb5_context context,
3911 if(derived_crypto(context, crypto))
3912 return decrypt_internal_derived(context, crypto, usage,
3913 data, len, result, ivec);
3914 else if (special_crypto (context, crypto))
3915 return decrypt_internal_special(context, crypto, usage,
3916 data, len, result, ivec);
3918 return decrypt_internal(context, crypto, data, len, result, ivec);
3921 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3922 krb5_decrypt(krb5_context context,
3929 return krb5_decrypt_ivec (context, crypto, usage, data, len, result,
3933 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3934 krb5_decrypt_EncryptedData(krb5_context context,
3937 const EncryptedData *e,
3940 return krb5_decrypt(context, crypto, usage,
3941 e->cipher.data, e->cipher.length, result);
3944 /************************************************************
3946 ************************************************************/
3948 #define ENTROPY_NEEDED 128
3951 seed_something(void)
3953 char buf[1024], seedfile[256];
3955 /* If there is a seed file, load it. But such a file cannot be trusted,
3956 so use 0 for the entropy estimate */
3957 if (RAND_file_name(seedfile, sizeof(seedfile))) {
3959 fd = open(seedfile, O_RDONLY | O_BINARY | O_CLOEXEC);
3963 ret = read(fd, buf, sizeof(buf));
3965 RAND_add(buf, ret, 0.0);
3972 /* Calling RAND_status() will try to use /dev/urandom if it exists so
3973 we do not have to deal with it. */
3974 if (RAND_status() != 1) {
3976 krb5_context context;
3980 if (!krb5_init_context(&context)) {
3981 p = krb5_config_get_string(context, NULL, "libdefaults",
3982 "egd_socket", NULL);
3984 RAND_egd_bytes(p, ENTROPY_NEEDED);
3985 krb5_free_context(context);
3988 /* TODO: Once a Windows CryptoAPI RAND method is defined, we
3989 can use that and failover to another method. */
3993 if (RAND_status() == 1) {
3994 /* Update the seed file */
3996 RAND_write_file(seedfile);
4003 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
4004 krb5_generate_random_block(void *buf, size_t len)
4006 static int rng_initialized = 0;
4008 HEIMDAL_MUTEX_lock(&crypto_mutex);
4009 if (!rng_initialized) {
4010 if (seed_something())
4011 krb5_abortx(NULL, "Fatal: could not seed the "
4012 "random number generator");
4014 rng_initialized = 1;
4016 HEIMDAL_MUTEX_unlock(&crypto_mutex);
4017 if (RAND_bytes(buf, len) <= 0)
4018 krb5_abortx(NULL, "Failed to generate random block");
4021 static krb5_error_code
4022 derive_key(krb5_context context,
4023 struct encryption_type *et,
4024 struct key_data *key,
4025 const void *constant,
4028 unsigned char *k = NULL;
4029 unsigned int nblocks = 0, i;
4030 krb5_error_code ret = 0;
4031 struct key_type *kt = et->keytype;
4033 ret = _key_schedule(context, key);
4036 if(et->blocksize * 8 < kt->bits || len != et->blocksize) {
4037 nblocks = (kt->bits + et->blocksize * 8 - 1) / (et->blocksize * 8);
4038 k = malloc(nblocks * et->blocksize);
4041 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
4044 ret = _krb5_n_fold(constant, len, k, et->blocksize);
4046 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
4050 for(i = 0; i < nblocks; i++) {
4052 memcpy(k + i * et->blocksize,
4053 k + (i - 1) * et->blocksize,
4055 (*et->encrypt)(context, key, k + i * et->blocksize, et->blocksize,
4059 /* this case is probably broken, but won't be run anyway */
4060 void *c = malloc(len);
4061 size_t res_len = (kt->bits + 7) / 8;
4063 if(len != 0 && c == NULL) {
4065 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
4068 memcpy(c, constant, len);
4069 (*et->encrypt)(context, key, c, len, 1, 0, NULL);
4070 k = malloc(res_len);
4071 if(res_len != 0 && k == NULL) {
4074 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
4077 ret = _krb5_n_fold(c, len, k, res_len);
4080 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
4085 /* XXX keytype dependent post-processing */
4088 DES3_random_to_key(context, key->key, k, nblocks * et->blocksize);
4090 case KEYTYPE_AES128:
4091 case KEYTYPE_AES256:
4092 memcpy(key->key->keyvalue.data, k, key->key->keyvalue.length);
4095 ret = KRB5_CRYPTO_INTERNAL;
4096 krb5_set_error_message(context, ret,
4097 N_("derive_key() called with unknown keytype (%u)", ""),
4102 if (key->schedule) {
4103 free_key_schedule(context, key, et);
4104 key->schedule = NULL;
4107 memset(k, 0, nblocks * et->blocksize);
4113 static struct key_data *
4114 _new_derived_key(krb5_crypto crypto, unsigned usage)
4116 struct key_usage *d = crypto->key_usage;
4117 d = realloc(d, (crypto->num_key_usage + 1) * sizeof(*d));
4120 crypto->key_usage = d;
4121 d += crypto->num_key_usage++;
4122 memset(d, 0, sizeof(*d));
4127 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4128 krb5_derive_key(krb5_context context,
4129 const krb5_keyblock *key,
4131 const void *constant,
4132 size_t constant_len,
4133 krb5_keyblock **derived_key)
4135 krb5_error_code ret;
4136 struct encryption_type *et;
4139 *derived_key = NULL;
4141 et = _find_enctype (etype);
4143 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
4144 N_("encryption type %d not supported", ""),
4146 return KRB5_PROG_ETYPE_NOSUPP;
4149 ret = krb5_copy_keyblock(context, key, &d.key);
4154 ret = derive_key(context, et, &d, constant, constant_len);
4156 ret = krb5_copy_keyblock(context, d.key, derived_key);
4157 free_key_data(context, &d, et);
4161 static krb5_error_code
4162 _get_derived_key(krb5_context context,
4165 struct key_data **key)
4169 unsigned char constant[5];
4171 for(i = 0; i < crypto->num_key_usage; i++)
4172 if(crypto->key_usage[i].usage == usage) {
4173 *key = &crypto->key_usage[i].key;
4176 d = _new_derived_key(crypto, usage);
4178 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
4181 krb5_copy_keyblock(context, crypto->key.key, &d->key);
4182 _krb5_put_int(constant, usage, 5);
4183 derive_key(context, crypto->et, d, constant, sizeof(constant));
4189 * Create a crypto context used for all encryption and signature
4190 * operation. The encryption type to use is taken from the key, but
4191 * can be overridden with the enctype parameter. This can be useful
4192 * for encryptions types which is compatiable (DES for example).
4194 * To free the crypto context, use krb5_crypto_destroy().
4196 * @param context Kerberos context
4197 * @param key the key block information with all key data
4198 * @param etype the encryption type
4199 * @param crypto the resulting crypto context
4201 * @return Return an error code or 0.
4203 * @ingroup krb5_crypto
4206 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4207 krb5_crypto_init(krb5_context context,
4208 const krb5_keyblock *key,
4210 krb5_crypto *crypto)
4212 krb5_error_code ret;
4214 if(*crypto == NULL) {
4215 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
4218 if(etype == ETYPE_NULL)
4219 etype = key->keytype;
4220 (*crypto)->et = _find_enctype(etype);
4221 if((*crypto)->et == NULL || ((*crypto)->et->flags & F_DISABLED)) {
4224 krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
4225 N_("encryption type %d not supported", ""),
4227 return KRB5_PROG_ETYPE_NOSUPP;
4229 if((*crypto)->et->keytype->size != key->keyvalue.length) {
4232 krb5_set_error_message (context, KRB5_BAD_KEYSIZE,
4233 "encryption key has bad length");
4234 return KRB5_BAD_KEYSIZE;
4236 ret = krb5_copy_keyblock(context, key, &(*crypto)->key.key);
4242 (*crypto)->key.schedule = NULL;
4243 (*crypto)->num_key_usage = 0;
4244 (*crypto)->key_usage = NULL;
4249 free_key_schedule(krb5_context context,
4250 struct key_data *key,
4251 struct encryption_type *et)
4253 if (et->keytype->cleanup)
4254 (*et->keytype->cleanup)(context, key);
4255 memset(key->schedule->data, 0, key->schedule->length);
4256 krb5_free_data(context, key->schedule);
4260 free_key_data(krb5_context context, struct key_data *key,
4261 struct encryption_type *et)
4263 krb5_free_keyblock(context, key->key);
4265 free_key_schedule(context, key, et);
4266 key->schedule = NULL;
4271 free_key_usage(krb5_context context, struct key_usage *ku,
4272 struct encryption_type *et)
4274 free_key_data(context, &ku->key, et);
4278 * Free a crypto context created by krb5_crypto_init().
4280 * @param context Kerberos context
4281 * @param crypto crypto context to free
4283 * @return Return an error code or 0.
4285 * @ingroup krb5_crypto
4288 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4289 krb5_crypto_destroy(krb5_context context,
4294 for(i = 0; i < crypto->num_key_usage; i++)
4295 free_key_usage(context, &crypto->key_usage[i], crypto->et);
4296 free(crypto->key_usage);
4297 free_key_data(context, &crypto->key, crypto->et);
4303 * Return the blocksize used algorithm referenced by the crypto context
4305 * @param context Kerberos context
4306 * @param crypto crypto context to query
4307 * @param blocksize the resulting blocksize
4309 * @return Return an error code or 0.
4311 * @ingroup krb5_crypto
4314 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4315 krb5_crypto_getblocksize(krb5_context context,
4319 *blocksize = crypto->et->blocksize;
4324 * Return the encryption type used by the crypto context
4326 * @param context Kerberos context
4327 * @param crypto crypto context to query
4328 * @param enctype the resulting encryption type
4330 * @return Return an error code or 0.
4332 * @ingroup krb5_crypto
4335 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4336 krb5_crypto_getenctype(krb5_context context,
4338 krb5_enctype *enctype)
4340 *enctype = crypto->et->type;
4345 * Return the padding size used by the crypto context
4347 * @param context Kerberos context
4348 * @param crypto crypto context to query
4349 * @param padsize the return padding size
4351 * @return Return an error code or 0.
4353 * @ingroup krb5_crypto
4356 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4357 krb5_crypto_getpadsize(krb5_context context,
4361 *padsize = crypto->et->padsize;
4366 * Return the confounder size used by the crypto context
4368 * @param context Kerberos context
4369 * @param crypto crypto context to query
4370 * @param confoundersize the returned confounder size
4372 * @return Return an error code or 0.
4374 * @ingroup krb5_crypto
4377 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4378 krb5_crypto_getconfoundersize(krb5_context context,
4380 size_t *confoundersize)
4382 *confoundersize = crypto->et->confoundersize;
4388 * Disable encryption type
4390 * @param context Kerberos 5 context
4391 * @param enctype encryption type to disable
4393 * @return Return an error code or 0.
4395 * @ingroup krb5_crypto
4398 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4399 krb5_enctype_disable(krb5_context context,
4400 krb5_enctype enctype)
4402 struct encryption_type *et = _find_enctype(enctype);
4405 krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
4406 N_("encryption type %d not supported", ""),
4408 return KRB5_PROG_ETYPE_NOSUPP;
4410 et->flags |= F_DISABLED;
4415 * Enable encryption type
4417 * @param context Kerberos 5 context
4418 * @param enctype encryption type to enable
4420 * @return Return an error code or 0.
4422 * @ingroup krb5_crypto
4425 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4426 krb5_enctype_enable(krb5_context context,
4427 krb5_enctype enctype)
4429 struct encryption_type *et = _find_enctype(enctype);
4432 krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
4433 N_("encryption type %d not supported", ""),
4435 return KRB5_PROG_ETYPE_NOSUPP;
4437 et->flags &= ~F_DISABLED;
4442 * Enable or disable all weak encryption types
4444 * @param context Kerberos 5 context
4445 * @param enable true to enable, false to disable
4447 * @return Return an error code or 0.
4449 * @ingroup krb5_crypto
4452 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4453 krb5_allow_weak_crypto(krb5_context context,
4454 krb5_boolean enable)
4458 for(i = 0; i < num_etypes; i++)
4459 if(etypes[i]->flags & F_WEAK) {
4461 etypes[i]->flags &= ~F_DISABLED;
4463 etypes[i]->flags |= F_DISABLED;
4469 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4470 krb5_string_to_key_derived(krb5_context context,
4476 struct encryption_type *et = _find_enctype(etype);
4477 krb5_error_code ret;
4483 krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
4484 N_("encryption type %d not supported", ""),
4486 return KRB5_PROG_ETYPE_NOSUPP;
4488 keylen = et->keytype->bits / 8;
4491 if(kd.key == NULL) {
4492 krb5_set_error_message (context, ENOMEM,
4493 N_("malloc: out of memory", ""));
4496 ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
4501 kd.key->keytype = etype;
4502 tmp = malloc (keylen);
4504 krb5_free_keyblock(context, kd.key);
4505 krb5_set_error_message (context, ENOMEM, N_("malloc: out of memory", ""));
4508 ret = _krb5_n_fold(str, len, tmp, keylen);
4511 krb5_set_error_message (context, ENOMEM, N_("malloc: out of memory", ""));
4515 DES3_random_to_key(context, kd.key, tmp, keylen);
4516 memset(tmp, 0, keylen);
4518 ret = derive_key(context,
4521 "kerberos", /* XXX well known constant */
4522 strlen("kerberos"));
4524 free_key_data(context, &kd, et);
4527 ret = krb5_copy_keyblock_contents(context, kd.key, key);
4528 free_key_data(context, &kd, et);
4533 wrapped_length (krb5_context context,
4537 struct encryption_type *et = crypto->et;
4538 size_t padsize = et->padsize;
4539 size_t checksumsize = CHECKSUMSIZE(et->checksum);
4542 res = et->confoundersize + checksumsize + data_len;
4543 res = (res + padsize - 1) / padsize * padsize;
4548 wrapped_length_dervied (krb5_context context,
4552 struct encryption_type *et = crypto->et;
4553 size_t padsize = et->padsize;
4556 res = et->confoundersize + data_len;
4557 res = (res + padsize - 1) / padsize * padsize;
4558 if (et->keyed_checksum)
4559 res += et->keyed_checksum->checksumsize;
4561 res += et->checksum->checksumsize;
4566 * Return the size of an encrypted packet of length `data_len'
4570 krb5_get_wrapped_length (krb5_context context,
4574 if (derived_crypto (context, crypto))
4575 return wrapped_length_dervied (context, crypto, data_len);
4577 return wrapped_length (context, crypto, data_len);
4581 * Return the size of an encrypted packet of length `data_len'
4585 crypto_overhead (krb5_context context,
4588 struct encryption_type *et = crypto->et;
4591 res = CHECKSUMSIZE(et->checksum);
4592 res += et->confoundersize;
4593 if (et->padsize > 1)
4599 crypto_overhead_dervied (krb5_context context,
4602 struct encryption_type *et = crypto->et;
4605 if (et->keyed_checksum)
4606 res = CHECKSUMSIZE(et->keyed_checksum);
4608 res = CHECKSUMSIZE(et->checksum);
4609 res += et->confoundersize;
4610 if (et->padsize > 1)
4616 krb5_crypto_overhead (krb5_context context, krb5_crypto crypto)
4618 if (derived_crypto (context, crypto))
4619 return crypto_overhead_dervied (context, crypto);
4621 return crypto_overhead (context, crypto);
4625 * Converts the random bytestring to a protocol key according to
4626 * Kerberos crypto frame work. It may be assumed that all the bits of
4627 * the input string are equally random, even though the entropy
4628 * present in the random source may be limited.
4630 * @param context Kerberos 5 context
4631 * @param type the enctype resulting key will be of
4632 * @param data input random data to convert to a key
4633 * @param size size of input random data, at least krb5_enctype_keysize() long
4634 * @param key key, output key, free with krb5_free_keyblock_contents()
4636 * @return Return an error code or 0.
4638 * @ingroup krb5_crypto
4641 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4642 krb5_random_to_key(krb5_context context,
4648 krb5_error_code ret;
4649 struct encryption_type *et = _find_enctype(type);
4651 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
4652 N_("encryption type %d not supported", ""),
4654 return KRB5_PROG_ETYPE_NOSUPP;
4656 if ((et->keytype->bits + 7) / 8 > size) {
4657 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
4658 N_("encryption key %s needs %d bytes "
4659 "of random to make an encryption key "
4661 et->name, (int)et->keytype->size);
4662 return KRB5_PROG_ETYPE_NOSUPP;
4664 ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
4667 key->keytype = type;
4668 if (et->keytype->random_to_key)
4669 (*et->keytype->random_to_key)(context, key, data, size);
4671 memcpy(key->keyvalue.data, data, et->keytype->size);
4677 _krb5_pk_octetstring2key(krb5_context context,
4681 const heim_octet_string *c_n,
4682 const heim_octet_string *k_n,
4685 struct encryption_type *et = _find_enctype(type);
4686 krb5_error_code ret;
4687 size_t keylen, offset;
4689 unsigned char counter;
4690 unsigned char shaoutput[SHA_DIGEST_LENGTH];
4694 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
4695 N_("encryption type %d not supported", ""),
4697 return KRB5_PROG_ETYPE_NOSUPP;
4699 keylen = (et->keytype->bits + 7) / 8;
4701 keydata = malloc(keylen);
4702 if (keydata == NULL) {
4703 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
4707 m = EVP_MD_CTX_create();
4710 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
4718 EVP_DigestInit_ex(m, EVP_sha1(), NULL);
4719 EVP_DigestUpdate(m, &counter, 1);
4720 EVP_DigestUpdate(m, dhdata, dhsize);
4723 EVP_DigestUpdate(m, c_n->data, c_n->length);
4725 EVP_DigestUpdate(m, k_n->data, k_n->length);
4727 EVP_DigestFinal_ex(m, shaoutput, NULL);
4729 memcpy((unsigned char *)keydata + offset,
4731 min(keylen - offset, sizeof(shaoutput)));
4733 offset += sizeof(shaoutput);
4735 } while(offset < keylen);
4736 memset(shaoutput, 0, sizeof(shaoutput));
4738 EVP_MD_CTX_destroy(m);
4740 ret = krb5_random_to_key(context, type, keydata, keylen, key);
4741 memset(keydata, 0, sizeof(keylen));
4746 static krb5_error_code
4747 encode_uvinfo(krb5_context context, krb5_const_principal p, krb5_data *data)
4749 KRB5PrincipalName pn;
4750 krb5_error_code ret;
4753 pn.principalName = p->name;
4754 pn.realm = p->realm;
4756 ASN1_MALLOC_ENCODE(KRB5PrincipalName, data->data, data->length,
4759 krb5_data_zero(data);
4760 krb5_set_error_message(context, ret,
4761 N_("Failed to encode KRB5PrincipalName", ""));
4764 if (data->length != size)
4765 krb5_abortx(context, "asn1 compiler internal error");
4769 static krb5_error_code
4770 encode_otherinfo(krb5_context context,
4771 const AlgorithmIdentifier *ai,
4772 krb5_const_principal client,
4773 krb5_const_principal server,
4774 krb5_enctype enctype,
4775 const krb5_data *as_req,
4776 const krb5_data *pk_as_rep,
4777 const Ticket *ticket,
4780 PkinitSP80056AOtherInfo otherinfo;
4781 PkinitSuppPubInfo pubinfo;
4782 krb5_error_code ret;
4786 krb5_data_zero(other);
4787 memset(&otherinfo, 0, sizeof(otherinfo));
4788 memset(&pubinfo, 0, sizeof(pubinfo));
4790 pubinfo.enctype = enctype;
4791 pubinfo.as_REQ = *as_req;
4792 pubinfo.pk_as_rep = *pk_as_rep;
4793 pubinfo.ticket = *ticket;
4794 ASN1_MALLOC_ENCODE(PkinitSuppPubInfo, pub.data, pub.length,
4795 &pubinfo, &size, ret);
4797 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
4800 if (pub.length != size)
4801 krb5_abortx(context, "asn1 compiler internal error");
4803 ret = encode_uvinfo(context, client, &otherinfo.partyUInfo);
4808 ret = encode_uvinfo(context, server, &otherinfo.partyVInfo);
4810 free(otherinfo.partyUInfo.data);
4815 otherinfo.algorithmID = *ai;
4816 otherinfo.suppPubInfo = &pub;
4818 ASN1_MALLOC_ENCODE(PkinitSP80056AOtherInfo, other->data, other->length,
4819 &otherinfo, &size, ret);
4820 free(otherinfo.partyUInfo.data);
4821 free(otherinfo.partyVInfo.data);
4824 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
4827 if (other->length != size)
4828 krb5_abortx(context, "asn1 compiler internal error");
4834 _krb5_pk_kdf(krb5_context context,
4835 const struct AlgorithmIdentifier *ai,
4838 krb5_const_principal client,
4839 krb5_const_principal server,
4840 krb5_enctype enctype,
4841 const krb5_data *as_req,
4842 const krb5_data *pk_as_rep,
4843 const Ticket *ticket,
4846 struct encryption_type *et;
4847 krb5_error_code ret;
4849 size_t keylen, offset;
4851 unsigned char *keydata;
4852 unsigned char shaoutput[SHA_DIGEST_LENGTH];
4855 if (der_heim_oid_cmp(&asn1_oid_id_pkinit_kdf_ah_sha1, &ai->algorithm) != 0) {
4856 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
4857 N_("KDF not supported", ""));
4858 return KRB5_PROG_ETYPE_NOSUPP;
4860 if (ai->parameters != NULL &&
4861 (ai->parameters->length != 2 ||
4862 memcmp(ai->parameters->data, "\x05\x00", 2) != 0))
4864 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
4865 N_("kdf params not NULL or the NULL-type",
4867 return KRB5_PROG_ETYPE_NOSUPP;
4870 et = _find_enctype(enctype);
4872 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
4873 N_("encryption type %d not supported", ""),
4875 return KRB5_PROG_ETYPE_NOSUPP;
4877 keylen = (et->keytype->bits + 7) / 8;
4879 keydata = malloc(keylen);
4880 if (keydata == NULL) {
4881 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
4885 ret = encode_otherinfo(context, ai, client, server,
4886 enctype, as_req, pk_as_rep, ticket, &other);
4892 m = EVP_MD_CTX_create();
4896 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
4903 unsigned char cdata[4];
4905 EVP_DigestInit_ex(m, EVP_sha1(), NULL);
4906 _krb5_put_int(cdata, counter, 4);
4907 EVP_DigestUpdate(m, cdata, 4);
4908 EVP_DigestUpdate(m, dhdata, dhsize);
4909 EVP_DigestUpdate(m, other.data, other.length);
4911 EVP_DigestFinal_ex(m, shaoutput, NULL);
4913 memcpy((unsigned char *)keydata + offset,
4915 min(keylen - offset, sizeof(shaoutput)));
4917 offset += sizeof(shaoutput);
4919 } while(offset < keylen);
4920 memset(shaoutput, 0, sizeof(shaoutput));
4922 EVP_MD_CTX_destroy(m);
4925 ret = krb5_random_to_key(context, enctype, keydata, keylen, key);
4926 memset(keydata, 0, sizeof(keylen));
4933 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4934 krb5_crypto_prf_length(krb5_context context,
4938 struct encryption_type *et = _find_enctype(type);
4940 if(et == NULL || et->prf_length == 0) {
4941 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
4942 N_("encryption type %d not supported", ""),
4944 return KRB5_PROG_ETYPE_NOSUPP;
4947 *length = et->prf_length;
4951 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4952 krb5_crypto_prf(krb5_context context,
4953 const krb5_crypto crypto,
4954 const krb5_data *input,
4957 struct encryption_type *et = crypto->et;
4959 krb5_data_zero(output);
4961 if(et->prf == NULL) {
4962 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
4963 "kerberos prf for %s not supported",
4965 return KRB5_PROG_ETYPE_NOSUPP;
4968 return (*et->prf)(context, crypto, input, output);
4971 static krb5_error_code
4972 krb5_crypto_prfplus(krb5_context context,
4973 const krb5_crypto crypto,
4974 const krb5_data *input,
4978 krb5_error_code ret;
4980 unsigned char i = 1;
4983 krb5_data_zero(&input2);
4984 krb5_data_zero(output);
4986 krb5_clear_error_message(context);
4988 ret = krb5_data_alloc(output, length);
4990 ret = krb5_data_alloc(&input2, input->length + 1);
4993 krb5_clear_error_message(context);
4995 memcpy(((unsigned char *)input2.data) + 1, input->data, input->length);
5002 ((unsigned char *)input2.data)[0] = i++;
5004 ret = krb5_crypto_prf(context, crypto, &input2, &block);
5008 if (block.length < length) {
5009 memcpy(p, block.data, block.length);
5010 length -= block.length;
5012 memcpy(p, block.data, length);
5016 krb5_data_free(&block);
5020 krb5_data_free(&input2);
5022 krb5_data_free(output);
5027 * The FX-CF2 key derivation function, used in FAST and preauth framework.
5029 * @param context Kerberos 5 context
5030 * @param crypto1 first key to combine
5031 * @param crypto2 second key to combine
5032 * @param pepper1 factor to combine with first key to garante uniqueness
5033 * @param pepper2 factor to combine with second key to garante uniqueness
5034 * @param enctype the encryption type of the resulting key
5035 * @param res allocated key, free with krb5_free_keyblock_contents()
5037 * @return Return an error code or 0.
5039 * @ingroup krb5_crypto
5042 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
5043 krb5_crypto_fx_cf2(krb5_context context,
5044 const krb5_crypto crypto1,
5045 const krb5_crypto crypto2,
5048 krb5_enctype enctype,
5051 krb5_error_code ret;
5055 memset(res, 0, sizeof(*res));
5057 ret = krb5_enctype_keysize(context, enctype, &keysize);
5061 ret = krb5_data_alloc(&res->keyvalue, keysize);
5064 ret = krb5_crypto_prfplus(context, crypto1, pepper1, keysize, &os1);
5067 ret = krb5_crypto_prfplus(context, crypto2, pepper2, keysize, &os2);
5071 res->keytype = enctype;
5073 unsigned char *p1 = os1.data, *p2 = os2.data, *p3 = res->keyvalue.data;
5074 for (i = 0; i < keysize; i++)
5075 p3[i] = p1[i] ^ p2[i];
5079 krb5_data_free(&res->keyvalue);
5080 krb5_data_free(&os1);
5081 krb5_data_free(&os2);
5088 #ifndef HEIMDAL_SMALLER
5091 * Deprecated: keytypes doesn't exists, they are really enctypes.
5093 * @ingroup krb5_deprecated
5097 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
5098 krb5_keytype_to_enctypes (krb5_context context,
5099 krb5_keytype keytype,
5107 for (i = num_etypes - 1; i >= 0; --i) {
5108 if (etypes[i]->keytype->type == keytype
5109 && !(etypes[i]->flags & F_PSEUDO)
5110 && krb5_enctype_valid(context, etypes[i]->type) == 0)
5114 krb5_set_error_message(context, KRB5_PROG_KEYTYPE_NOSUPP,
5115 "Keytype have no mapping");
5116 return KRB5_PROG_KEYTYPE_NOSUPP;
5119 ret = malloc(n * sizeof(*ret));
5120 if (ret == NULL && n != 0) {
5121 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
5125 for (i = num_etypes - 1; i >= 0; --i) {
5126 if (etypes[i]->keytype->type == keytype
5127 && !(etypes[i]->flags & F_PSEUDO)
5128 && krb5_enctype_valid(context, etypes[i]->type) == 0)
5129 ret[n++] = etypes[i]->type;
5137 * Deprecated: keytypes doesn't exists, they are really enctypes.
5139 * @ingroup krb5_deprecated
5142 /* if two enctypes have compatible keys */
5144 KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
5145 krb5_enctypes_compatible_keys(krb5_context context,
5146 krb5_enctype etype1,
5147 krb5_enctype etype2)
5149 struct encryption_type *e1 = _find_enctype(etype1);
5150 struct encryption_type *e2 = _find_enctype(etype2);
5151 return e1 != NULL && e2 != NULL && e1->keytype == e2->keytype;
5154 #endif /* HEIMDAL_SMALLER */