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_enctype (*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 return KRB5KRB_AP_ERR_BAD_INTEGRITY; /* XXX */
1852 keyed_checksum = (ct->flags & F_KEYED) != 0;
1853 if(keyed_checksum) {
1854 struct checksum_type *kct;
1855 if (crypto == NULL) {
1856 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
1857 N_("Checksum type %s is keyed but no "
1858 "crypto context (key) was passed in", ""),
1860 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
1862 kct = crypto->et->keyed_checksum;
1863 if (kct != NULL && kct->type != ct->type) {
1864 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
1865 N_("Checksum type %s is keyed, but "
1866 "the key type %s passed didnt have that checksum "
1867 "type as the keyed type", ""),
1868 ct->name, crypto->et->name);
1869 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
1872 ret = get_checksum_key(context, crypto, usage, ct, &dkey);
1878 return (*ct->verify)(context, dkey, data, len, usage, cksum);
1880 ret = krb5_data_alloc (&c.checksum, ct->checksumsize);
1884 ret = (*ct->checksum)(context, dkey, data, len, usage, &c);
1886 krb5_data_free(&c.checksum);
1890 if(c.checksum.length != cksum->checksum.length ||
1891 ct_memcmp(c.checksum.data, cksum->checksum.data, c.checksum.length)) {
1892 krb5_clear_error_message (context);
1893 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1897 krb5_data_free (&c.checksum);
1901 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1902 krb5_verify_checksum(krb5_context context,
1904 krb5_key_usage usage,
1909 struct checksum_type *ct;
1912 ct = _find_checksum(cksum->cksumtype);
1914 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
1915 N_("checksum type %d not supported", ""),
1917 return KRB5_PROG_SUMTYPE_NOSUPP;
1920 if (arcfour_checksum_p(ct, crypto)) {
1922 usage2arcfour(context, &keyusage);
1924 keyusage = CHECKSUM_USAGE(usage);
1926 return verify_checksum(context, crypto, keyusage,
1930 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1931 krb5_crypto_get_checksum_type(krb5_context context,
1933 krb5_cksumtype *type)
1935 struct checksum_type *ct = NULL;
1937 if (crypto != NULL) {
1938 ct = crypto->et->keyed_checksum;
1940 ct = crypto->et->checksum;
1944 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
1945 N_("checksum type not found", ""));
1946 return KRB5_PROG_SUMTYPE_NOSUPP;
1955 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1956 krb5_checksumsize(krb5_context context,
1957 krb5_cksumtype type,
1960 struct checksum_type *ct = _find_checksum(type);
1962 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
1963 N_("checksum type %d not supported", ""),
1965 return KRB5_PROG_SUMTYPE_NOSUPP;
1967 *size = ct->checksumsize;
1971 KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
1972 krb5_checksum_is_keyed(krb5_context context,
1973 krb5_cksumtype type)
1975 struct checksum_type *ct = _find_checksum(type);
1978 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
1979 N_("checksum type %d not supported", ""),
1981 return KRB5_PROG_SUMTYPE_NOSUPP;
1983 return ct->flags & F_KEYED;
1986 KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
1987 krb5_checksum_is_collision_proof(krb5_context context,
1988 krb5_cksumtype type)
1990 struct checksum_type *ct = _find_checksum(type);
1993 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
1994 N_("checksum type %d not supported", ""),
1996 return KRB5_PROG_SUMTYPE_NOSUPP;
1998 return ct->flags & F_CPROOF;
2001 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2002 krb5_checksum_disable(krb5_context context,
2003 krb5_cksumtype type)
2005 struct checksum_type *ct = _find_checksum(type);
2008 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
2009 N_("checksum type %d not supported", ""),
2011 return KRB5_PROG_SUMTYPE_NOSUPP;
2013 ct->flags |= F_DISABLED;
2017 /************************************************************
2019 ************************************************************/
2021 static krb5_error_code
2022 NULL_encrypt(krb5_context context,
2023 struct key_data *key,
2026 krb5_boolean encryptp,
2033 static krb5_error_code
2034 evp_encrypt(krb5_context context,
2035 struct key_data *key,
2038 krb5_boolean encryptp,
2042 struct evp_schedule *ctx = key->schedule->data;
2044 c = encryptp ? &ctx->ectx : &ctx->dctx;
2047 size_t len2 = EVP_CIPHER_CTX_iv_length(c);
2048 void *loiv = malloc(len2);
2050 krb5_clear_error_message(context);
2053 memset(loiv, 0, len2);
2054 EVP_CipherInit_ex(c, NULL, NULL, NULL, loiv, -1);
2057 EVP_CipherInit_ex(c, NULL, NULL, NULL, ivec, -1);
2058 EVP_Cipher(c, data, data, len);
2062 static const unsigned char zero_ivec[EVP_MAX_BLOCK_LENGTH] = { 0 };
2064 static krb5_error_code
2065 evp_encrypt_cts(krb5_context context,
2066 struct key_data *key,
2069 krb5_boolean encryptp,
2073 size_t i, blocksize;
2074 struct evp_schedule *ctx = key->schedule->data;
2075 char tmp[EVP_MAX_BLOCK_LENGTH], ivec2[EVP_MAX_BLOCK_LENGTH];
2079 c = encryptp ? &ctx->ectx : &ctx->dctx;
2081 blocksize = EVP_CIPHER_CTX_block_size(c);
2083 if (len < blocksize) {
2084 krb5_set_error_message(context, EINVAL,
2085 "message block too short");
2087 } else if (len == blocksize) {
2088 EVP_CipherInit_ex(c, NULL, NULL, NULL, zero_ivec, -1);
2089 EVP_Cipher(c, data, data, len);
2094 EVP_CipherInit_ex(c, NULL, NULL, NULL, ivec, -1);
2096 EVP_CipherInit_ex(c, NULL, NULL, NULL, zero_ivec, -1);
2101 i = ((len - 1) / blocksize) * blocksize;
2102 EVP_Cipher(c, p, p, i);
2105 memcpy(ivec2, p, blocksize);
2107 for (i = 0; i < len; i++)
2108 tmp[i] = p[i + blocksize] ^ ivec2[i];
2109 for (; i < blocksize; i++)
2110 tmp[i] = 0 ^ ivec2[i];
2112 EVP_CipherInit_ex(c, NULL, NULL, NULL, zero_ivec, -1);
2113 EVP_Cipher(c, p, tmp, blocksize);
2115 memcpy(p + blocksize, ivec2, len);
2117 memcpy(ivec, p, blocksize);
2119 char tmp2[EVP_MAX_BLOCK_LENGTH], tmp3[EVP_MAX_BLOCK_LENGTH];
2122 if (len > blocksize * 2) {
2123 /* remove last two blocks and round up, decrypt this with cbc, then do cts dance */
2124 i = ((((len - blocksize * 2) + blocksize - 1) / blocksize) * blocksize);
2125 memcpy(ivec2, p + i - blocksize, blocksize);
2126 EVP_Cipher(c, p, p, i);
2128 len -= i + blocksize;
2131 memcpy(ivec2, ivec, blocksize);
2133 memcpy(ivec2, zero_ivec, blocksize);
2137 memcpy(tmp, p, blocksize);
2138 EVP_CipherInit_ex(c, NULL, NULL, NULL, zero_ivec, -1);
2139 EVP_Cipher(c, tmp2, p, blocksize);
2141 memcpy(tmp3, p + blocksize, len);
2142 memcpy(tmp3 + len, tmp2 + len, blocksize - len); /* xor 0 */
2144 for (i = 0; i < len; i++)
2145 p[i + blocksize] = tmp2[i] ^ tmp3[i];
2147 EVP_CipherInit_ex(c, NULL, NULL, NULL, zero_ivec, -1);
2148 EVP_Cipher(c, p, tmp3, blocksize);
2150 for (i = 0; i < blocksize; i++)
2153 memcpy(ivec, tmp, blocksize);
2158 #ifdef HEIM_WEAK_CRYPTO
2159 static krb5_error_code
2160 evp_des_encrypt_null_ivec(krb5_context context,
2161 struct key_data *key,
2164 krb5_boolean encryptp,
2168 struct evp_schedule *ctx = key->schedule->data;
2171 memset(&ivec, 0, sizeof(ivec));
2172 c = encryptp ? &ctx->ectx : &ctx->dctx;
2173 EVP_CipherInit_ex(c, NULL, NULL, NULL, (void *)&ivec, -1);
2174 EVP_Cipher(c, data, data, len);
2178 static krb5_error_code
2179 evp_des_encrypt_key_ivec(krb5_context context,
2180 struct key_data *key,
2183 krb5_boolean encryptp,
2187 struct evp_schedule *ctx = key->schedule->data;
2190 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
2191 c = encryptp ? &ctx->ectx : &ctx->dctx;
2192 EVP_CipherInit_ex(c, NULL, NULL, NULL, (void *)&ivec, -1);
2193 EVP_Cipher(c, data, data, len);
2197 static krb5_error_code
2198 DES_CFB64_encrypt_null_ivec(krb5_context context,
2199 struct key_data *key,
2202 krb5_boolean encryptp,
2208 DES_key_schedule *s = key->schedule->data;
2209 memset(&ivec, 0, sizeof(ivec));
2211 DES_cfb64_encrypt(data, data, len, s, &ivec, &num, encryptp);
2215 static krb5_error_code
2216 DES_PCBC_encrypt_key_ivec(krb5_context context,
2217 struct key_data *key,
2220 krb5_boolean encryptp,
2225 DES_key_schedule *s = key->schedule->data;
2226 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
2228 DES_pcbc_encrypt(data, data, len, s, &ivec, encryptp);
2234 * section 6 of draft-brezak-win2k-krb-rc4-hmac-03
2236 * warning: not for small children
2239 static krb5_error_code
2240 ARCFOUR_subencrypt(krb5_context context,
2241 struct key_data *key,
2248 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
2249 Checksum k1_c, k2_c, k3_c, cksum;
2253 unsigned char *cdata = data;
2254 unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
2255 krb5_error_code ret;
2257 t[0] = (usage >> 0) & 0xFF;
2258 t[1] = (usage >> 8) & 0xFF;
2259 t[2] = (usage >> 16) & 0xFF;
2260 t[3] = (usage >> 24) & 0xFF;
2262 k1_c.checksum.length = sizeof(k1_c_data);
2263 k1_c.checksum.data = k1_c_data;
2265 ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
2267 krb5_abortx(context, "hmac failed");
2269 memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
2271 k2_c.checksum.length = sizeof(k2_c_data);
2272 k2_c.checksum.data = k2_c_data;
2275 kb.keyvalue = k2_c.checksum;
2277 cksum.checksum.length = 16;
2278 cksum.checksum.data = data;
2280 ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
2282 krb5_abortx(context, "hmac failed");
2285 kb.keyvalue = k1_c.checksum;
2287 k3_c.checksum.length = sizeof(k3_c_data);
2288 k3_c.checksum.data = k3_c_data;
2290 ret = hmac(NULL, c, data, 16, 0, &ke, &k3_c);
2292 krb5_abortx(context, "hmac failed");
2294 EVP_CIPHER_CTX_init(&ctx);
2296 EVP_CipherInit_ex(&ctx, EVP_rc4(), NULL, k3_c.checksum.data, NULL, 1);
2297 EVP_Cipher(&ctx, cdata + 16, cdata + 16, len - 16);
2298 EVP_CIPHER_CTX_cleanup(&ctx);
2300 memset (k1_c_data, 0, sizeof(k1_c_data));
2301 memset (k2_c_data, 0, sizeof(k2_c_data));
2302 memset (k3_c_data, 0, sizeof(k3_c_data));
2306 static krb5_error_code
2307 ARCFOUR_subdecrypt(krb5_context context,
2308 struct key_data *key,
2315 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
2316 Checksum k1_c, k2_c, k3_c, cksum;
2320 unsigned char *cdata = data;
2321 unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
2322 unsigned char cksum_data[16];
2323 krb5_error_code ret;
2325 t[0] = (usage >> 0) & 0xFF;
2326 t[1] = (usage >> 8) & 0xFF;
2327 t[2] = (usage >> 16) & 0xFF;
2328 t[3] = (usage >> 24) & 0xFF;
2330 k1_c.checksum.length = sizeof(k1_c_data);
2331 k1_c.checksum.data = k1_c_data;
2333 ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
2335 krb5_abortx(context, "hmac failed");
2337 memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
2339 k2_c.checksum.length = sizeof(k2_c_data);
2340 k2_c.checksum.data = k2_c_data;
2343 kb.keyvalue = k1_c.checksum;
2345 k3_c.checksum.length = sizeof(k3_c_data);
2346 k3_c.checksum.data = k3_c_data;
2348 ret = hmac(NULL, c, cdata, 16, 0, &ke, &k3_c);
2350 krb5_abortx(context, "hmac failed");
2352 EVP_CIPHER_CTX_init(&ctx);
2353 EVP_CipherInit_ex(&ctx, EVP_rc4(), NULL, k3_c.checksum.data, NULL, 0);
2354 EVP_Cipher(&ctx, cdata + 16, cdata + 16, len - 16);
2355 EVP_CIPHER_CTX_cleanup(&ctx);
2358 kb.keyvalue = k2_c.checksum;
2360 cksum.checksum.length = 16;
2361 cksum.checksum.data = cksum_data;
2363 ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
2365 krb5_abortx(context, "hmac failed");
2367 memset (k1_c_data, 0, sizeof(k1_c_data));
2368 memset (k2_c_data, 0, sizeof(k2_c_data));
2369 memset (k3_c_data, 0, sizeof(k3_c_data));
2371 if (ct_memcmp (cksum.checksum.data, data, 16) != 0) {
2372 krb5_clear_error_message (context);
2373 return KRB5KRB_AP_ERR_BAD_INTEGRITY;
2380 * convert the usage numbers used in
2381 * draft-ietf-cat-kerb-key-derivation-00.txt to the ones in
2382 * draft-brezak-win2k-krb-rc4-hmac-04.txt
2385 static krb5_error_code
2386 usage2arcfour (krb5_context context, unsigned *usage)
2389 case KRB5_KU_AS_REP_ENC_PART : /* 3 */
2392 case KRB5_KU_USAGE_SEAL : /* 22 */
2395 case KRB5_KU_USAGE_SIGN : /* 23 */
2398 case KRB5_KU_USAGE_SEQ: /* 24 */
2406 static krb5_error_code
2407 ARCFOUR_encrypt(krb5_context context,
2408 struct key_data *key,
2411 krb5_boolean encryptp,
2415 krb5_error_code ret;
2416 unsigned keyusage = usage;
2418 if((ret = usage2arcfour (context, &keyusage)) != 0)
2422 return ARCFOUR_subencrypt (context, key, data, len, keyusage, ivec);
2424 return ARCFOUR_subdecrypt (context, key, data, len, keyusage, ivec);
2432 static krb5_error_code
2433 AES_PRF(krb5_context context,
2435 const krb5_data *in,
2438 struct checksum_type *ct = crypto->et->checksum;
2439 krb5_error_code ret;
2441 krb5_keyblock *derived;
2443 result.cksumtype = ct->type;
2444 ret = krb5_data_alloc(&result.checksum, ct->checksumsize);
2446 krb5_set_error_message(context, ret, N_("malloc: out memory", ""));
2450 ret = (*ct->checksum)(context, NULL, in->data, in->length, 0, &result);
2452 krb5_data_free(&result.checksum);
2456 if (result.checksum.length < crypto->et->blocksize)
2457 krb5_abortx(context, "internal prf error");
2460 ret = krb5_derive_key(context, crypto->key.key,
2461 crypto->et->type, "prf", 3, &derived);
2463 krb5_abortx(context, "krb5_derive_key");
2465 ret = krb5_data_alloc(out, crypto->et->blocksize);
2467 krb5_abortx(context, "malloc failed");
2470 const EVP_CIPHER *c = (*crypto->et->keytype->evp)();
2473 EVP_CIPHER_CTX_init(&ctx); /* ivec all zero */
2474 EVP_CipherInit_ex(&ctx, c, NULL, derived->keyvalue.data, NULL, 1);
2475 EVP_Cipher(&ctx, out->data, result.checksum.data,
2476 crypto->et->blocksize);
2477 EVP_CIPHER_CTX_cleanup(&ctx);
2480 krb5_data_free(&result.checksum);
2481 krb5_free_keyblock(context, derived);
2487 * these should currently be in reverse preference order.
2488 * (only relevant for !F_PSEUDO) */
2490 static struct encryption_type enctype_null = {
2504 static struct encryption_type enctype_arcfour_hmac_md5 = {
2505 ETYPE_ARCFOUR_HMAC_MD5,
2518 #ifdef DES3_OLD_ENCTYPE
2519 static struct encryption_type enctype_des3_cbc_md5 = {
2527 &checksum_rsa_md5_des3,
2534 static struct encryption_type enctype_des3_cbc_sha1 = {
2535 ETYPE_DES3_CBC_SHA1,
2540 &keytype_des3_derived,
2542 &checksum_hmac_sha1_des3,
2548 #ifdef DES3_OLD_ENCTYPE
2549 static struct encryption_type enctype_old_des3_cbc_sha1 = {
2550 ETYPE_OLD_DES3_CBC_SHA1,
2551 "old-des3-cbc-sha1",
2557 &checksum_hmac_sha1_des3,
2564 static struct encryption_type enctype_aes128_cts_hmac_sha1 = {
2565 ETYPE_AES128_CTS_HMAC_SHA1_96,
2566 "aes128-cts-hmac-sha1-96",
2572 &checksum_hmac_sha1_aes128,
2578 static struct encryption_type enctype_aes256_cts_hmac_sha1 = {
2579 ETYPE_AES256_CTS_HMAC_SHA1_96,
2580 "aes256-cts-hmac-sha1-96",
2586 &checksum_hmac_sha1_aes256,
2592 static struct encryption_type enctype_des3_cbc_none = {
2593 ETYPE_DES3_CBC_NONE,
2598 &keytype_des3_derived,
2606 #ifdef HEIM_WEAK_CRYPTO
2607 static struct encryption_type enctype_des_cbc_crc = {
2617 evp_des_encrypt_key_ivec,
2621 static struct encryption_type enctype_des_cbc_md4 = {
2629 &checksum_rsa_md4_des,
2631 evp_des_encrypt_null_ivec,
2635 static struct encryption_type enctype_des_cbc_md5 = {
2643 &checksum_rsa_md5_des,
2645 evp_des_encrypt_null_ivec,
2649 static struct encryption_type enctype_des_cbc_none = {
2658 F_PSEUDO|F_DISABLED|F_WEAK,
2659 evp_des_encrypt_null_ivec,
2663 static struct encryption_type enctype_des_cfb64_none = {
2664 ETYPE_DES_CFB64_NONE,
2672 F_PSEUDO|F_DISABLED|F_WEAK,
2673 DES_CFB64_encrypt_null_ivec,
2677 static struct encryption_type enctype_des_pcbc_none = {
2678 ETYPE_DES_PCBC_NONE,
2686 F_PSEUDO|F_DISABLED|F_WEAK,
2687 DES_PCBC_encrypt_key_ivec,
2691 #endif /* HEIM_WEAK_CRYPTO */
2693 static struct encryption_type *etypes[] = {
2694 &enctype_aes256_cts_hmac_sha1,
2695 &enctype_aes128_cts_hmac_sha1,
2696 &enctype_des3_cbc_sha1,
2697 &enctype_des3_cbc_none, /* used by the gss-api mech */
2698 &enctype_arcfour_hmac_md5,
2699 #ifdef DES3_OLD_ENCTYPE
2700 &enctype_des3_cbc_md5,
2701 &enctype_old_des3_cbc_sha1,
2703 #ifdef HEIM_WEAK_CRYPTO
2704 &enctype_des_cbc_crc,
2705 &enctype_des_cbc_md4,
2706 &enctype_des_cbc_md5,
2707 &enctype_des_cbc_none,
2708 &enctype_des_cfb64_none,
2709 &enctype_des_pcbc_none,
2714 static unsigned num_etypes = sizeof(etypes) / sizeof(etypes[0]);
2717 static struct encryption_type *
2718 _find_enctype(krb5_enctype type)
2721 for(i = 0; i < num_etypes; i++)
2722 if(etypes[i]->type == type)
2728 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2729 krb5_enctype_to_string(krb5_context context,
2733 struct encryption_type *e;
2734 e = _find_enctype(etype);
2736 krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
2737 N_("encryption type %d not supported", ""),
2740 return KRB5_PROG_ETYPE_NOSUPP;
2742 *string = strdup(e->name);
2743 if(*string == NULL) {
2744 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
2750 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2751 krb5_string_to_enctype(krb5_context context,
2753 krb5_enctype *etype)
2756 for(i = 0; i < num_etypes; i++)
2757 if(strcasecmp(etypes[i]->name, string) == 0){
2758 *etype = etypes[i]->type;
2761 krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
2762 N_("encryption type %s not supported", ""),
2764 return KRB5_PROG_ETYPE_NOSUPP;
2767 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2768 krb5_enctype_to_keytype(krb5_context context,
2770 krb5_keytype *keytype)
2772 struct encryption_type *e = _find_enctype(etype);
2774 krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
2775 N_("encryption type %d not supported", ""),
2777 return KRB5_PROG_ETYPE_NOSUPP;
2779 *keytype = e->keytype->type; /* XXX */
2783 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2784 krb5_enctype_valid(krb5_context context,
2787 struct encryption_type *e = _find_enctype(etype);
2789 krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
2790 N_("encryption type %d not supported", ""),
2792 return KRB5_PROG_ETYPE_NOSUPP;
2794 if (e->flags & F_DISABLED) {
2795 krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
2796 N_("encryption type %s is disabled", ""),
2798 return KRB5_PROG_ETYPE_NOSUPP;
2804 * Return the coresponding encryption type for a checksum type.
2806 * @param context Kerberos context
2807 * @param ctype The checksum type to get the result enctype for
2808 * @param etype The returned encryption, when the matching etype is
2809 * not found, etype is set to ETYPE_NULL.
2811 * @return Return an error code for an failure or 0 on success.
2812 * @ingroup krb5_crypto
2816 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2817 krb5_cksumtype_to_enctype(krb5_context context,
2818 krb5_cksumtype ctype,
2819 krb5_enctype *etype)
2823 *etype = ETYPE_NULL;
2825 for(i = 0; i < num_etypes; i++) {
2826 if(etypes[i]->keyed_checksum &&
2827 etypes[i]->keyed_checksum->type == ctype)
2829 *etype = etypes[i]->type;
2834 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
2835 N_("checksum type %d not supported", ""),
2837 return KRB5_PROG_SUMTYPE_NOSUPP;
2841 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2842 krb5_cksumtype_valid(krb5_context context,
2843 krb5_cksumtype ctype)
2845 struct checksum_type *c = _find_checksum(ctype);
2847 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
2848 N_("checksum type %d not supported", ""),
2850 return KRB5_PROG_SUMTYPE_NOSUPP;
2852 if (c->flags & F_DISABLED) {
2853 krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
2854 N_("checksum type %s is disabled", ""),
2856 return KRB5_PROG_SUMTYPE_NOSUPP;
2863 derived_crypto(krb5_context context,
2866 return (crypto->et->flags & F_DERIVED) != 0;
2870 special_crypto(krb5_context context,
2873 return (crypto->et->flags & F_SPECIAL) != 0;
2876 #define CHECKSUMSIZE(C) ((C)->checksumsize)
2877 #define CHECKSUMTYPE(C) ((C)->type)
2879 static krb5_error_code
2880 encrypt_internal_derived(krb5_context context,
2888 size_t sz, block_sz, checksum_sz, total_sz;
2890 unsigned char *p, *q;
2891 krb5_error_code ret;
2892 struct key_data *dkey;
2893 const struct encryption_type *et = crypto->et;
2895 checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
2897 sz = et->confoundersize + len;
2898 block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
2899 total_sz = block_sz + checksum_sz;
2900 p = calloc(1, total_sz);
2902 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
2907 krb5_generate_random_block(q, et->confoundersize); /* XXX */
2908 q += et->confoundersize;
2909 memcpy(q, data, len);
2911 ret = create_checksum(context,
2914 INTEGRITY_USAGE(usage),
2918 if(ret == 0 && cksum.checksum.length != checksum_sz) {
2919 free_Checksum (&cksum);
2920 krb5_clear_error_message (context);
2921 ret = KRB5_CRYPTO_INTERNAL;
2925 memcpy(p + block_sz, cksum.checksum.data, cksum.checksum.length);
2926 free_Checksum (&cksum);
2927 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
2930 ret = _key_schedule(context, dkey);
2933 ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec);
2937 result->length = total_sz;
2940 memset(p, 0, total_sz);
2946 static krb5_error_code
2947 encrypt_internal(krb5_context context,
2954 size_t sz, block_sz, checksum_sz;
2956 unsigned char *p, *q;
2957 krb5_error_code ret;
2958 const struct encryption_type *et = crypto->et;
2960 checksum_sz = CHECKSUMSIZE(et->checksum);
2962 sz = et->confoundersize + checksum_sz + len;
2963 block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
2964 p = calloc(1, block_sz);
2966 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
2971 krb5_generate_random_block(q, et->confoundersize); /* XXX */
2972 q += et->confoundersize;
2973 memset(q, 0, checksum_sz);
2975 memcpy(q, data, len);
2977 ret = create_checksum(context,
2984 if(ret == 0 && cksum.checksum.length != checksum_sz) {
2985 krb5_clear_error_message (context);
2986 free_Checksum(&cksum);
2987 ret = KRB5_CRYPTO_INTERNAL;
2991 memcpy(p + et->confoundersize, cksum.checksum.data, cksum.checksum.length);
2992 free_Checksum(&cksum);
2993 ret = _key_schedule(context, &crypto->key);
2996 ret = (*et->encrypt)(context, &crypto->key, p, block_sz, 1, 0, ivec);
2998 memset(p, 0, block_sz);
3003 result->length = block_sz;
3006 memset(p, 0, block_sz);
3011 static krb5_error_code
3012 encrypt_internal_special(krb5_context context,
3020 struct encryption_type *et = crypto->et;
3021 size_t cksum_sz = CHECKSUMSIZE(et->checksum);
3022 size_t sz = len + cksum_sz + et->confoundersize;
3024 krb5_error_code ret;
3028 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
3032 memset (p, 0, cksum_sz);
3034 krb5_generate_random_block(p, et->confoundersize);
3035 p += et->confoundersize;
3036 memcpy (p, data, len);
3037 ret = (*et->encrypt)(context, &crypto->key, tmp, sz, TRUE, usage, ivec);
3044 result->length = sz;
3048 static krb5_error_code
3049 decrypt_internal_derived(krb5_context context,
3060 krb5_error_code ret;
3061 struct key_data *dkey;
3062 struct encryption_type *et = crypto->et;
3065 checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
3066 if (len < checksum_sz + et->confoundersize) {
3067 krb5_set_error_message(context, KRB5_BAD_MSIZE,
3068 N_("Encrypted data shorter then "
3069 "checksum + confunder", ""));
3070 return KRB5_BAD_MSIZE;
3073 if (((len - checksum_sz) % et->padsize) != 0) {
3074 krb5_clear_error_message(context);
3075 return KRB5_BAD_MSIZE;
3079 if(len != 0 && p == NULL) {
3080 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
3083 memcpy(p, data, len);
3087 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
3092 ret = _key_schedule(context, dkey);
3097 ret = (*et->encrypt)(context, dkey, p, len, 0, usage, ivec);
3103 cksum.checksum.data = p + len;
3104 cksum.checksum.length = checksum_sz;
3105 cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
3107 ret = verify_checksum(context,
3109 INTEGRITY_USAGE(usage),
3117 l = len - et->confoundersize;
3118 memmove(p, p + et->confoundersize, l);
3119 result->data = realloc(p, l);
3120 if(result->data == NULL && l != 0) {
3122 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
3129 static krb5_error_code
3130 decrypt_internal(krb5_context context,
3137 krb5_error_code ret;
3140 size_t checksum_sz, l;
3141 struct encryption_type *et = crypto->et;
3143 if ((len % et->padsize) != 0) {
3144 krb5_clear_error_message(context);
3145 return KRB5_BAD_MSIZE;
3147 checksum_sz = CHECKSUMSIZE(et->checksum);
3148 if (len < checksum_sz + et->confoundersize) {
3149 krb5_set_error_message(context, KRB5_BAD_MSIZE,
3150 N_("Encrypted data shorter then "
3151 "checksum + confunder", ""));
3152 return KRB5_BAD_MSIZE;
3156 if(len != 0 && p == NULL) {
3157 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
3160 memcpy(p, data, len);
3162 ret = _key_schedule(context, &crypto->key);
3167 ret = (*et->encrypt)(context, &crypto->key, p, len, 0, 0, ivec);
3172 ret = krb5_data_copy(&cksum.checksum, p + et->confoundersize, checksum_sz);
3177 memset(p + et->confoundersize, 0, checksum_sz);
3178 cksum.cksumtype = CHECKSUMTYPE(et->checksum);
3179 ret = verify_checksum(context, NULL, 0, p, len, &cksum);
3180 free_Checksum(&cksum);
3185 l = len - et->confoundersize - checksum_sz;
3186 memmove(p, p + et->confoundersize + checksum_sz, l);
3187 result->data = realloc(p, l);
3188 if(result->data == NULL && l != 0) {
3190 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
3197 static krb5_error_code
3198 decrypt_internal_special(krb5_context context,
3206 struct encryption_type *et = crypto->et;
3207 size_t cksum_sz = CHECKSUMSIZE(et->checksum);
3208 size_t sz = len - cksum_sz - et->confoundersize;
3210 krb5_error_code ret;
3212 if ((len % et->padsize) != 0) {
3213 krb5_clear_error_message(context);
3214 return KRB5_BAD_MSIZE;
3216 if (len < cksum_sz + et->confoundersize) {
3217 krb5_set_error_message(context, KRB5_BAD_MSIZE,
3218 N_("Encrypted data shorter then "
3219 "checksum + confunder", ""));
3220 return KRB5_BAD_MSIZE;
3225 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
3228 memcpy(p, data, len);
3230 ret = (*et->encrypt)(context, &crypto->key, p, len, FALSE, usage, ivec);
3236 memmove (p, p + cksum_sz + et->confoundersize, sz);
3237 result->data = realloc(p, sz);
3238 if(result->data == NULL && sz != 0) {
3240 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
3243 result->length = sz;
3247 static krb5_crypto_iov *
3248 find_iv(krb5_crypto_iov *data, int num_data, int type)
3251 for (i = 0; i < num_data; i++)
3252 if (data[i].flags == type)
3258 * Inline encrypt a kerberos message
3260 * @param context Kerberos context
3261 * @param crypto Kerberos crypto context
3262 * @param usage Key usage for this buffer
3263 * @param data array of buffers to process
3264 * @param num_data length of array
3265 * @param ivec initial cbc/cts vector
3267 * @return Return an error code or 0.
3268 * @ingroup krb5_crypto
3270 * Kerberos encrypted data look like this:
3272 * 1. KRB5_CRYPTO_TYPE_HEADER
3273 * 2. array [1,...] KRB5_CRYPTO_TYPE_DATA and array [0,...]
3274 * KRB5_CRYPTO_TYPE_SIGN_ONLY in any order, however the receiver
3275 * have to aware of the order. KRB5_CRYPTO_TYPE_SIGN_ONLY is
3276 * commonly used headers and trailers.
3277 * 3. KRB5_CRYPTO_TYPE_PADDING, at least on padsize long if padsize > 1
3278 * 4. KRB5_CRYPTO_TYPE_TRAILER
3281 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3282 krb5_encrypt_iov_ivec(krb5_context context,
3285 krb5_crypto_iov *data,
3289 size_t headersz, trailersz, len;
3291 size_t sz, block_sz, pad_sz;
3293 unsigned char *p, *q;
3294 krb5_error_code ret;
3295 struct key_data *dkey;
3296 const struct encryption_type *et = crypto->et;
3297 krb5_crypto_iov *tiv, *piv, *hiv;
3300 krb5_clear_error_message(context);
3301 return KRB5_CRYPTO_INTERNAL;
3304 if(!derived_crypto(context, crypto)) {
3305 krb5_clear_error_message(context);
3306 return KRB5_CRYPTO_INTERNAL;
3309 headersz = et->confoundersize;
3310 trailersz = CHECKSUMSIZE(et->keyed_checksum);
3312 for (len = 0, i = 0; i < num_data; i++) {
3313 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
3315 len += data[i].data.length;
3318 sz = headersz + len;
3319 block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
3321 pad_sz = block_sz - sz;
3325 hiv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_HEADER);
3326 if (hiv == NULL || hiv->data.length != headersz)
3327 return KRB5_BAD_MSIZE;
3329 krb5_generate_random_block(hiv->data.data, hiv->data.length);
3332 piv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_PADDING);
3333 /* its ok to have no TYPE_PADDING if there is no padding */
3334 if (piv == NULL && pad_sz != 0)
3335 return KRB5_BAD_MSIZE;
3337 if (piv->data.length < pad_sz)
3338 return KRB5_BAD_MSIZE;
3339 piv->data.length = pad_sz;
3341 memset(piv->data.data, pad_sz, pad_sz);
3347 tiv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_TRAILER);
3348 if (tiv == NULL || tiv->data.length != trailersz)
3349 return KRB5_BAD_MSIZE;
3352 * XXX replace with EVP_Sign? at least make create_checksum an iov
3354 * XXX CTS EVP is broken, can't handle multi buffers :(
3358 for (i = 0; i < num_data; i++) {
3359 if (data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
3361 len += data[i].data.length;
3364 p = q = malloc(len);
3366 memcpy(q, hiv->data.data, hiv->data.length);
3367 q += hiv->data.length;
3368 for (i = 0; i < num_data; i++) {
3369 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
3370 data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
3372 memcpy(q, data[i].data.data, data[i].data.length);
3373 q += data[i].data.length;
3376 memset(q, 0, piv->data.length);
3378 ret = create_checksum(context,
3381 INTEGRITY_USAGE(usage),
3386 if(ret == 0 && cksum.checksum.length != trailersz) {
3387 free_Checksum (&cksum);
3388 krb5_clear_error_message (context);
3389 ret = KRB5_CRYPTO_INTERNAL;
3394 /* save cksum at end */
3395 memcpy(tiv->data.data, cksum.checksum.data, cksum.checksum.length);
3396 free_Checksum (&cksum);
3398 /* XXX replace with EVP_Cipher */
3399 p = q = malloc(block_sz);
3403 memcpy(q, hiv->data.data, hiv->data.length);
3404 q += hiv->data.length;
3406 for (i = 0; i < num_data; i++) {
3407 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
3409 memcpy(q, data[i].data.data, data[i].data.length);
3410 q += data[i].data.length;
3413 memset(q, 0, piv->data.length);
3416 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
3421 ret = _key_schedule(context, dkey);
3427 ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec);
3433 /* now copy data back to buffers */
3436 memcpy(hiv->data.data, q, hiv->data.length);
3437 q += hiv->data.length;
3439 for (i = 0; i < num_data; i++) {
3440 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
3442 memcpy(data[i].data.data, q, data[i].data.length);
3443 q += data[i].data.length;
3446 memcpy(piv->data.data, q, pad_sz);
3454 * Inline decrypt a Kerberos message.
3456 * @param context Kerberos context
3457 * @param crypto Kerberos crypto context
3458 * @param usage Key usage for this buffer
3459 * @param data array of buffers to process
3460 * @param num_data length of array
3461 * @param ivec initial cbc/cts vector
3463 * @return Return an error code or 0.
3464 * @ingroup krb5_crypto
3466 * 1. KRB5_CRYPTO_TYPE_HEADER
3467 * 2. one KRB5_CRYPTO_TYPE_DATA and array [0,...] of KRB5_CRYPTO_TYPE_SIGN_ONLY in
3468 * any order, however the receiver have to aware of the
3469 * order. KRB5_CRYPTO_TYPE_SIGN_ONLY is commonly used unencrypoted
3470 * protocol headers and trailers. The output data will be of same
3471 * size as the input data or shorter.
3474 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3475 krb5_decrypt_iov_ivec(krb5_context context,
3478 krb5_crypto_iov *data,
3479 unsigned int num_data,
3483 size_t headersz, trailersz, len;
3485 unsigned char *p, *q;
3486 krb5_error_code ret;
3487 struct key_data *dkey;
3488 struct encryption_type *et = crypto->et;
3489 krb5_crypto_iov *tiv, *hiv;
3492 krb5_clear_error_message(context);
3493 return KRB5_CRYPTO_INTERNAL;
3496 if(!derived_crypto(context, crypto)) {
3497 krb5_clear_error_message(context);
3498 return KRB5_CRYPTO_INTERNAL;
3501 headersz = et->confoundersize;
3503 hiv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_HEADER);
3504 if (hiv == NULL || hiv->data.length != headersz)
3505 return KRB5_BAD_MSIZE;
3508 trailersz = CHECKSUMSIZE(et->keyed_checksum);
3510 tiv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_TRAILER);
3511 if (tiv->data.length != trailersz)
3512 return KRB5_BAD_MSIZE;
3514 /* Find length of data we will decrypt */
3517 for (i = 0; i < num_data; i++) {
3518 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
3520 len += data[i].data.length;
3523 if ((len % et->padsize) != 0) {
3524 krb5_clear_error_message(context);
3525 return KRB5_BAD_MSIZE;
3528 /* XXX replace with EVP_Cipher */
3530 p = q = malloc(len);
3534 memcpy(q, hiv->data.data, hiv->data.length);
3535 q += hiv->data.length;
3537 for (i = 0; i < num_data; i++) {
3538 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
3540 memcpy(q, data[i].data.data, data[i].data.length);
3541 q += data[i].data.length;
3544 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
3549 ret = _key_schedule(context, dkey);
3555 ret = (*et->encrypt)(context, dkey, p, len, 0, usage, ivec);
3561 /* copy data back to buffers */
3562 memcpy(hiv->data.data, p, hiv->data.length);
3563 q = p + hiv->data.length;
3564 for (i = 0; i < num_data; i++) {
3565 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
3567 memcpy(data[i].data.data, q, data[i].data.length);
3568 q += data[i].data.length;
3573 /* check signature */
3574 for (i = 0; i < num_data; i++) {
3575 if (data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
3577 len += data[i].data.length;
3580 p = q = malloc(len);
3584 memcpy(q, hiv->data.data, hiv->data.length);
3585 q += hiv->data.length;
3586 for (i = 0; i < num_data; i++) {
3587 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
3588 data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
3590 memcpy(q, data[i].data.data, data[i].data.length);
3591 q += data[i].data.length;
3594 cksum.checksum.data = tiv->data.data;
3595 cksum.checksum.length = tiv->data.length;
3596 cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
3598 ret = verify_checksum(context,
3600 INTEGRITY_USAGE(usage),
3609 * Create a Kerberos message checksum.
3611 * @param context Kerberos context
3612 * @param crypto Kerberos crypto context
3613 * @param usage Key usage for this buffer
3614 * @param data array of buffers to process
3615 * @param num_data length of array
3616 * @param type output data
3618 * @return Return an error code or 0.
3619 * @ingroup krb5_crypto
3622 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3623 krb5_create_checksum_iov(krb5_context context,
3626 krb5_crypto_iov *data,
3627 unsigned int num_data,
3628 krb5_cksumtype *type)
3631 krb5_crypto_iov *civ;
3632 krb5_error_code ret;
3638 krb5_clear_error_message(context);
3639 return KRB5_CRYPTO_INTERNAL;
3642 if(!derived_crypto(context, crypto)) {
3643 krb5_clear_error_message(context);
3644 return KRB5_CRYPTO_INTERNAL;
3647 civ = find_iv(data, num_data, KRB5_CRYPTO_TYPE_CHECKSUM);
3649 return KRB5_BAD_MSIZE;
3652 for (i = 0; i < num_data; i++) {
3653 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
3654 data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
3656 len += data[i].data.length;
3659 p = q = malloc(len);
3661 for (i = 0; i < num_data; i++) {
3662 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
3663 data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
3665 memcpy(q, data[i].data.data, data[i].data.length);
3666 q += data[i].data.length;
3669 ret = krb5_create_checksum(context, crypto, usage, 0, p, len, &cksum);
3675 *type = cksum.cksumtype;
3677 if (cksum.checksum.length > civ->data.length) {
3678 krb5_set_error_message(context, KRB5_BAD_MSIZE,
3679 N_("Checksum larger then input buffer", ""));
3680 free_Checksum(&cksum);
3681 return KRB5_BAD_MSIZE;
3684 civ->data.length = cksum.checksum.length;
3685 memcpy(civ->data.data, cksum.checksum.data, civ->data.length);
3686 free_Checksum(&cksum);
3692 * Verify a Kerberos message checksum.
3694 * @param context Kerberos context
3695 * @param crypto Kerberos crypto context
3696 * @param usage Key usage for this buffer
3697 * @param data array of buffers to process
3698 * @param num_data length of array
3699 * @param type return checksum type if not NULL
3701 * @return Return an error code or 0.
3702 * @ingroup krb5_crypto
3705 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3706 krb5_verify_checksum_iov(krb5_context context,
3709 krb5_crypto_iov *data,
3710 unsigned int num_data,
3711 krb5_cksumtype *type)
3713 struct encryption_type *et = crypto->et;
3715 krb5_crypto_iov *civ;
3716 krb5_error_code ret;
3722 krb5_clear_error_message(context);
3723 return KRB5_CRYPTO_INTERNAL;
3726 if(!derived_crypto(context, crypto)) {
3727 krb5_clear_error_message(context);
3728 return KRB5_CRYPTO_INTERNAL;
3731 civ = find_iv(data, num_data, KRB5_CRYPTO_TYPE_CHECKSUM);
3733 return KRB5_BAD_MSIZE;
3736 for (i = 0; i < num_data; i++) {
3737 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
3738 data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
3740 len += data[i].data.length;
3743 p = q = malloc(len);
3745 for (i = 0; i < num_data; i++) {
3746 if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
3747 data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
3749 memcpy(q, data[i].data.data, data[i].data.length);
3750 q += data[i].data.length;
3753 cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
3754 cksum.checksum.length = civ->data.length;
3755 cksum.checksum.data = civ->data.data;
3757 ret = krb5_verify_checksum(context, crypto, usage, p, len, &cksum);
3760 if (ret == 0 && type)
3761 *type = cksum.cksumtype;
3767 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3768 krb5_crypto_length(krb5_context context,
3773 if (!derived_crypto(context, crypto)) {
3774 krb5_set_error_message(context, EINVAL, "not a derived crypto");
3779 case KRB5_CRYPTO_TYPE_EMPTY:
3782 case KRB5_CRYPTO_TYPE_HEADER:
3783 *len = crypto->et->blocksize;
3785 case KRB5_CRYPTO_TYPE_DATA:
3786 case KRB5_CRYPTO_TYPE_SIGN_ONLY:
3787 /* len must already been filled in */
3789 case KRB5_CRYPTO_TYPE_PADDING:
3790 if (crypto->et->padsize > 1)
3791 *len = crypto->et->padsize;
3795 case KRB5_CRYPTO_TYPE_TRAILER:
3796 *len = CHECKSUMSIZE(crypto->et->keyed_checksum);
3798 case KRB5_CRYPTO_TYPE_CHECKSUM:
3799 if (crypto->et->keyed_checksum)
3800 *len = CHECKSUMSIZE(crypto->et->keyed_checksum);
3802 *len = CHECKSUMSIZE(crypto->et->checksum);
3805 krb5_set_error_message(context, EINVAL,
3806 "%d not a supported type", type);
3811 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3812 krb5_crypto_length_iov(krb5_context context,
3814 krb5_crypto_iov *data,
3815 unsigned int num_data)
3817 krb5_error_code ret;
3820 for (i = 0; i < num_data; i++) {
3821 ret = krb5_crypto_length(context, crypto,
3823 &data[i].data.length);
3831 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3832 krb5_encrypt_ivec(krb5_context context,
3840 if(derived_crypto(context, crypto))
3841 return encrypt_internal_derived(context, crypto, usage,
3842 data, len, result, ivec);
3843 else if (special_crypto(context, crypto))
3844 return encrypt_internal_special (context, crypto, usage,
3845 data, len, result, ivec);
3847 return encrypt_internal(context, crypto, data, len, result, ivec);
3850 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3851 krb5_encrypt(krb5_context context,
3858 return krb5_encrypt_ivec(context, crypto, usage, data, len, result, NULL);
3861 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3862 krb5_encrypt_EncryptedData(krb5_context context,
3868 EncryptedData *result)
3870 result->etype = CRYPTO_ETYPE(crypto);
3872 ALLOC(result->kvno, 1);
3873 *result->kvno = kvno;
3875 result->kvno = NULL;
3876 return krb5_encrypt(context, crypto, usage, data, len, &result->cipher);
3879 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3880 krb5_decrypt_ivec(krb5_context context,
3888 if(derived_crypto(context, crypto))
3889 return decrypt_internal_derived(context, crypto, usage,
3890 data, len, result, ivec);
3891 else if (special_crypto (context, crypto))
3892 return decrypt_internal_special(context, crypto, usage,
3893 data, len, result, ivec);
3895 return decrypt_internal(context, crypto, data, len, result, ivec);
3898 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3899 krb5_decrypt(krb5_context context,
3906 return krb5_decrypt_ivec (context, crypto, usage, data, len, result,
3910 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3911 krb5_decrypt_EncryptedData(krb5_context context,
3914 const EncryptedData *e,
3917 return krb5_decrypt(context, crypto, usage,
3918 e->cipher.data, e->cipher.length, result);
3921 /************************************************************
3923 ************************************************************/
3925 #define ENTROPY_NEEDED 128
3928 seed_something(void)
3930 char buf[1024], seedfile[256];
3932 /* If there is a seed file, load it. But such a file cannot be trusted,
3933 so use 0 for the entropy estimate */
3934 if (RAND_file_name(seedfile, sizeof(seedfile))) {
3936 fd = open(seedfile, O_RDONLY | O_BINARY | O_CLOEXEC);
3940 ret = read(fd, buf, sizeof(buf));
3942 RAND_add(buf, ret, 0.0);
3949 /* Calling RAND_status() will try to use /dev/urandom if it exists so
3950 we do not have to deal with it. */
3951 if (RAND_status() != 1) {
3953 krb5_context context;
3957 if (!krb5_init_context(&context)) {
3958 p = krb5_config_get_string(context, NULL, "libdefaults",
3959 "egd_socket", NULL);
3961 RAND_egd_bytes(p, ENTROPY_NEEDED);
3962 krb5_free_context(context);
3965 /* TODO: Once a Windows CryptoAPI RAND method is defined, we
3966 can use that and failover to another method. */
3970 if (RAND_status() == 1) {
3971 /* Update the seed file */
3973 RAND_write_file(seedfile);
3980 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
3981 krb5_generate_random_block(void *buf, size_t len)
3983 static int rng_initialized = 0;
3985 HEIMDAL_MUTEX_lock(&crypto_mutex);
3986 if (!rng_initialized) {
3987 if (seed_something())
3988 krb5_abortx(NULL, "Fatal: could not seed the "
3989 "random number generator");
3991 rng_initialized = 1;
3993 HEIMDAL_MUTEX_unlock(&crypto_mutex);
3994 if (RAND_bytes(buf, len) != 1)
3995 krb5_abortx(NULL, "Failed to generate random block");
3998 static krb5_error_code
3999 derive_key(krb5_context context,
4000 struct encryption_type *et,
4001 struct key_data *key,
4002 const void *constant,
4005 unsigned char *k = NULL;
4006 unsigned int nblocks = 0, i;
4007 krb5_error_code ret = 0;
4008 struct key_type *kt = et->keytype;
4010 ret = _key_schedule(context, key);
4013 if(et->blocksize * 8 < kt->bits || len != et->blocksize) {
4014 nblocks = (kt->bits + et->blocksize * 8 - 1) / (et->blocksize * 8);
4015 k = malloc(nblocks * et->blocksize);
4018 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
4021 ret = _krb5_n_fold(constant, len, k, et->blocksize);
4023 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
4027 for(i = 0; i < nblocks; i++) {
4029 memcpy(k + i * et->blocksize,
4030 k + (i - 1) * et->blocksize,
4032 (*et->encrypt)(context, key, k + i * et->blocksize, et->blocksize,
4036 /* this case is probably broken, but won't be run anyway */
4037 void *c = malloc(len);
4038 size_t res_len = (kt->bits + 7) / 8;
4040 if(len != 0 && c == NULL) {
4042 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
4045 memcpy(c, constant, len);
4046 (*et->encrypt)(context, key, c, len, 1, 0, NULL);
4047 k = malloc(res_len);
4048 if(res_len != 0 && k == NULL) {
4051 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
4054 ret = _krb5_n_fold(c, len, k, res_len);
4057 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
4062 /* XXX keytype dependent post-processing */
4065 DES3_random_to_key(context, key->key, k, nblocks * et->blocksize);
4067 case KEYTYPE_AES128:
4068 case KEYTYPE_AES256:
4069 memcpy(key->key->keyvalue.data, k, key->key->keyvalue.length);
4072 ret = KRB5_CRYPTO_INTERNAL;
4073 krb5_set_error_message(context, ret,
4074 N_("derive_key() called with unknown keytype (%u)", ""),
4079 if (key->schedule) {
4080 free_key_schedule(context, key, et);
4081 key->schedule = NULL;
4084 memset(k, 0, nblocks * et->blocksize);
4090 static struct key_data *
4091 _new_derived_key(krb5_crypto crypto, unsigned usage)
4093 struct key_usage *d = crypto->key_usage;
4094 d = realloc(d, (crypto->num_key_usage + 1) * sizeof(*d));
4097 crypto->key_usage = d;
4098 d += crypto->num_key_usage++;
4099 memset(d, 0, sizeof(*d));
4104 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4105 krb5_derive_key(krb5_context context,
4106 const krb5_keyblock *key,
4108 const void *constant,
4109 size_t constant_len,
4110 krb5_keyblock **derived_key)
4112 krb5_error_code ret;
4113 struct encryption_type *et;
4116 *derived_key = NULL;
4118 et = _find_enctype (etype);
4120 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
4121 N_("encryption type %d not supported", ""),
4123 return KRB5_PROG_ETYPE_NOSUPP;
4126 ret = krb5_copy_keyblock(context, key, &d.key);
4131 ret = derive_key(context, et, &d, constant, constant_len);
4133 ret = krb5_copy_keyblock(context, d.key, derived_key);
4134 free_key_data(context, &d, et);
4138 static krb5_error_code
4139 _get_derived_key(krb5_context context,
4142 struct key_data **key)
4146 unsigned char constant[5];
4148 for(i = 0; i < crypto->num_key_usage; i++)
4149 if(crypto->key_usage[i].usage == usage) {
4150 *key = &crypto->key_usage[i].key;
4153 d = _new_derived_key(crypto, usage);
4155 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
4158 krb5_copy_keyblock(context, crypto->key.key, &d->key);
4159 _krb5_put_int(constant, usage, 5);
4160 derive_key(context, crypto->et, d, constant, sizeof(constant));
4166 * Create a crypto context used for all encryption and signature
4167 * operation. The encryption type to use is taken from the key, but
4168 * can be overridden with the enctype parameter. This can be useful
4169 * for encryptions types which is compatiable (DES for example).
4171 * To free the crypto context, use krb5_crypto_destroy().
4173 * @param context Kerberos context
4174 * @param key the key block information with all key data
4175 * @param etype the encryption type
4176 * @param crypto the resulting crypto context
4178 * @return Return an error code or 0.
4180 * @ingroup krb5_crypto
4183 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4184 krb5_crypto_init(krb5_context context,
4185 const krb5_keyblock *key,
4187 krb5_crypto *crypto)
4189 krb5_error_code ret;
4191 if(*crypto == NULL) {
4192 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
4195 if(etype == ETYPE_NULL)
4196 etype = key->keytype;
4197 (*crypto)->et = _find_enctype(etype);
4198 if((*crypto)->et == NULL || ((*crypto)->et->flags & F_DISABLED)) {
4201 krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
4202 N_("encryption type %d not supported", ""),
4204 return KRB5_PROG_ETYPE_NOSUPP;
4206 if((*crypto)->et->keytype->size != key->keyvalue.length) {
4209 krb5_set_error_message (context, KRB5_BAD_KEYSIZE,
4210 "encryption key has bad length");
4211 return KRB5_BAD_KEYSIZE;
4213 ret = krb5_copy_keyblock(context, key, &(*crypto)->key.key);
4219 (*crypto)->key.schedule = NULL;
4220 (*crypto)->num_key_usage = 0;
4221 (*crypto)->key_usage = NULL;
4226 free_key_schedule(krb5_context context,
4227 struct key_data *key,
4228 struct encryption_type *et)
4230 if (et->keytype->cleanup)
4231 (*et->keytype->cleanup)(context, key);
4232 memset(key->schedule->data, 0, key->schedule->length);
4233 krb5_free_data(context, key->schedule);
4237 free_key_data(krb5_context context, struct key_data *key,
4238 struct encryption_type *et)
4240 krb5_free_keyblock(context, key->key);
4242 free_key_schedule(context, key, et);
4243 key->schedule = NULL;
4248 free_key_usage(krb5_context context, struct key_usage *ku,
4249 struct encryption_type *et)
4251 free_key_data(context, &ku->key, et);
4255 * Free a crypto context created by krb5_crypto_init().
4257 * @param context Kerberos context
4258 * @param crypto crypto context to free
4260 * @return Return an error code or 0.
4262 * @ingroup krb5_crypto
4265 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4266 krb5_crypto_destroy(krb5_context context,
4271 for(i = 0; i < crypto->num_key_usage; i++)
4272 free_key_usage(context, &crypto->key_usage[i], crypto->et);
4273 free(crypto->key_usage);
4274 free_key_data(context, &crypto->key, crypto->et);
4280 * Return the blocksize used algorithm referenced by the crypto context
4282 * @param context Kerberos context
4283 * @param crypto crypto context to query
4284 * @param blocksize the resulting blocksize
4286 * @return Return an error code or 0.
4288 * @ingroup krb5_crypto
4291 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4292 krb5_crypto_getblocksize(krb5_context context,
4296 *blocksize = crypto->et->blocksize;
4301 * Return the encryption type used by the crypto context
4303 * @param context Kerberos context
4304 * @param crypto crypto context to query
4305 * @param enctype the resulting encryption type
4307 * @return Return an error code or 0.
4309 * @ingroup krb5_crypto
4312 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4313 krb5_crypto_getenctype(krb5_context context,
4315 krb5_enctype *enctype)
4317 *enctype = crypto->et->type;
4322 * Return the padding size used by the crypto context
4324 * @param context Kerberos context
4325 * @param crypto crypto context to query
4326 * @param padsize the return padding size
4328 * @return Return an error code or 0.
4330 * @ingroup krb5_crypto
4333 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4334 krb5_crypto_getpadsize(krb5_context context,
4338 *padsize = crypto->et->padsize;
4343 * Return the confounder size used by the crypto context
4345 * @param context Kerberos context
4346 * @param crypto crypto context to query
4347 * @param confoundersize the returned confounder size
4349 * @return Return an error code or 0.
4351 * @ingroup krb5_crypto
4354 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4355 krb5_crypto_getconfoundersize(krb5_context context,
4357 size_t *confoundersize)
4359 *confoundersize = crypto->et->confoundersize;
4365 * Disable encryption type
4367 * @param context Kerberos 5 context
4368 * @param enctype encryption type to disable
4370 * @return Return an error code or 0.
4372 * @ingroup krb5_crypto
4375 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4376 krb5_enctype_disable(krb5_context context,
4377 krb5_enctype enctype)
4379 struct encryption_type *et = _find_enctype(enctype);
4382 krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
4383 N_("encryption type %d not supported", ""),
4385 return KRB5_PROG_ETYPE_NOSUPP;
4387 et->flags |= F_DISABLED;
4392 * Enable encryption type
4394 * @param context Kerberos 5 context
4395 * @param enctype encryption type to enable
4397 * @return Return an error code or 0.
4399 * @ingroup krb5_crypto
4402 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4403 krb5_enctype_enable(krb5_context context,
4404 krb5_enctype enctype)
4406 struct encryption_type *et = _find_enctype(enctype);
4409 krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
4410 N_("encryption type %d not supported", ""),
4412 return KRB5_PROG_ETYPE_NOSUPP;
4414 et->flags &= ~F_DISABLED;
4419 * Enable or disable all weak encryption types
4421 * @param context Kerberos 5 context
4422 * @param enable true to enable, false to disable
4424 * @return Return an error code or 0.
4426 * @ingroup krb5_crypto
4429 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4430 krb5_allow_weak_crypto(krb5_context context,
4431 krb5_boolean enable)
4435 for(i = 0; i < num_etypes; i++)
4436 if(etypes[i]->flags & F_WEAK) {
4438 etypes[i]->flags &= ~F_DISABLED;
4440 etypes[i]->flags |= F_DISABLED;
4446 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4447 krb5_string_to_key_derived(krb5_context context,
4453 struct encryption_type *et = _find_enctype(etype);
4454 krb5_error_code ret;
4460 krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
4461 N_("encryption type %d not supported", ""),
4463 return KRB5_PROG_ETYPE_NOSUPP;
4465 keylen = et->keytype->bits / 8;
4468 if(kd.key == NULL) {
4469 krb5_set_error_message (context, ENOMEM,
4470 N_("malloc: out of memory", ""));
4473 ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
4478 kd.key->keytype = etype;
4479 tmp = malloc (keylen);
4481 krb5_free_keyblock(context, kd.key);
4482 krb5_set_error_message (context, ENOMEM, N_("malloc: out of memory", ""));
4485 ret = _krb5_n_fold(str, len, tmp, keylen);
4488 krb5_set_error_message (context, ENOMEM, N_("malloc: out of memory", ""));
4492 DES3_random_to_key(context, kd.key, tmp, keylen);
4493 memset(tmp, 0, keylen);
4495 ret = derive_key(context,
4498 "kerberos", /* XXX well known constant */
4499 strlen("kerberos"));
4501 free_key_data(context, &kd, et);
4504 ret = krb5_copy_keyblock_contents(context, kd.key, key);
4505 free_key_data(context, &kd, et);
4510 wrapped_length (krb5_context context,
4514 struct encryption_type *et = crypto->et;
4515 size_t padsize = et->padsize;
4516 size_t checksumsize = CHECKSUMSIZE(et->checksum);
4519 res = et->confoundersize + checksumsize + data_len;
4520 res = (res + padsize - 1) / padsize * padsize;
4525 wrapped_length_dervied (krb5_context context,
4529 struct encryption_type *et = crypto->et;
4530 size_t padsize = et->padsize;
4533 res = et->confoundersize + data_len;
4534 res = (res + padsize - 1) / padsize * padsize;
4535 if (et->keyed_checksum)
4536 res += et->keyed_checksum->checksumsize;
4538 res += et->checksum->checksumsize;
4543 * Return the size of an encrypted packet of length `data_len'
4547 krb5_get_wrapped_length (krb5_context context,
4551 if (derived_crypto (context, crypto))
4552 return wrapped_length_dervied (context, crypto, data_len);
4554 return wrapped_length (context, crypto, data_len);
4558 * Return the size of an encrypted packet of length `data_len'
4562 crypto_overhead (krb5_context context,
4565 struct encryption_type *et = crypto->et;
4568 res = CHECKSUMSIZE(et->checksum);
4569 res += et->confoundersize;
4570 if (et->padsize > 1)
4576 crypto_overhead_dervied (krb5_context context,
4579 struct encryption_type *et = crypto->et;
4582 if (et->keyed_checksum)
4583 res = CHECKSUMSIZE(et->keyed_checksum);
4585 res = CHECKSUMSIZE(et->checksum);
4586 res += et->confoundersize;
4587 if (et->padsize > 1)
4593 krb5_crypto_overhead (krb5_context context, krb5_crypto crypto)
4595 if (derived_crypto (context, crypto))
4596 return crypto_overhead_dervied (context, crypto);
4598 return crypto_overhead (context, crypto);
4602 * Converts the random bytestring to a protocol key according to
4603 * Kerberos crypto frame work. It may be assumed that all the bits of
4604 * the input string are equally random, even though the entropy
4605 * present in the random source may be limited.
4607 * @param context Kerberos 5 context
4608 * @param type the enctype resulting key will be of
4609 * @param data input random data to convert to a key
4610 * @param size size of input random data, at least krb5_enctype_keysize() long
4611 * @param key key, output key, free with krb5_free_keyblock_contents()
4613 * @return Return an error code or 0.
4615 * @ingroup krb5_crypto
4618 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4619 krb5_random_to_key(krb5_context context,
4625 krb5_error_code ret;
4626 struct encryption_type *et = _find_enctype(type);
4628 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
4629 N_("encryption type %d not supported", ""),
4631 return KRB5_PROG_ETYPE_NOSUPP;
4633 if ((et->keytype->bits + 7) / 8 > size) {
4634 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
4635 N_("encryption key %s needs %d bytes "
4636 "of random to make an encryption key "
4638 et->name, (int)et->keytype->size);
4639 return KRB5_PROG_ETYPE_NOSUPP;
4641 ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
4644 key->keytype = type;
4645 if (et->keytype->random_to_key)
4646 (*et->keytype->random_to_key)(context, key, data, size);
4648 memcpy(key->keyvalue.data, data, et->keytype->size);
4654 _krb5_pk_octetstring2key(krb5_context context,
4658 const heim_octet_string *c_n,
4659 const heim_octet_string *k_n,
4662 struct encryption_type *et = _find_enctype(type);
4663 krb5_error_code ret;
4664 size_t keylen, offset;
4666 unsigned char counter;
4667 unsigned char shaoutput[SHA_DIGEST_LENGTH];
4671 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
4672 N_("encryption type %d not supported", ""),
4674 return KRB5_PROG_ETYPE_NOSUPP;
4676 keylen = (et->keytype->bits + 7) / 8;
4678 keydata = malloc(keylen);
4679 if (keydata == NULL) {
4680 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
4684 m = EVP_MD_CTX_create();
4687 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
4695 EVP_DigestInit_ex(m, EVP_sha1(), NULL);
4696 EVP_DigestUpdate(m, &counter, 1);
4697 EVP_DigestUpdate(m, dhdata, dhsize);
4700 EVP_DigestUpdate(m, c_n->data, c_n->length);
4702 EVP_DigestUpdate(m, k_n->data, k_n->length);
4704 EVP_DigestFinal_ex(m, shaoutput, NULL);
4706 memcpy((unsigned char *)keydata + offset,
4708 min(keylen - offset, sizeof(shaoutput)));
4710 offset += sizeof(shaoutput);
4712 } while(offset < keylen);
4713 memset(shaoutput, 0, sizeof(shaoutput));
4715 EVP_MD_CTX_destroy(m);
4717 ret = krb5_random_to_key(context, type, keydata, keylen, key);
4718 memset(keydata, 0, sizeof(keylen));
4723 static krb5_error_code
4724 encode_uvinfo(krb5_context context, krb5_const_principal p, krb5_data *data)
4726 KRB5PrincipalName pn;
4727 krb5_error_code ret;
4730 pn.principalName = p->name;
4731 pn.realm = p->realm;
4733 ASN1_MALLOC_ENCODE(KRB5PrincipalName, data->data, data->length,
4736 krb5_data_zero(data);
4737 krb5_set_error_message(context, ret,
4738 N_("Failed to encode KRB5PrincipalName", ""));
4741 if (data->length != size)
4742 krb5_abortx(context, "asn1 compiler internal error");
4746 static krb5_error_code
4747 encode_otherinfo(krb5_context context,
4748 const AlgorithmIdentifier *ai,
4749 krb5_const_principal client,
4750 krb5_const_principal server,
4751 krb5_enctype enctype,
4752 const krb5_data *as_req,
4753 const krb5_data *pk_as_rep,
4754 const Ticket *ticket,
4757 PkinitSP80056AOtherInfo otherinfo;
4758 PkinitSuppPubInfo pubinfo;
4759 krb5_error_code ret;
4763 krb5_data_zero(other);
4764 memset(&otherinfo, 0, sizeof(otherinfo));
4765 memset(&pubinfo, 0, sizeof(pubinfo));
4767 pubinfo.enctype = enctype;
4768 pubinfo.as_REQ = *as_req;
4769 pubinfo.pk_as_rep = *pk_as_rep;
4770 pubinfo.ticket = *ticket;
4771 ASN1_MALLOC_ENCODE(PkinitSuppPubInfo, pub.data, pub.length,
4772 &pubinfo, &size, ret);
4774 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
4777 if (pub.length != size)
4778 krb5_abortx(context, "asn1 compiler internal error");
4780 ret = encode_uvinfo(context, client, &otherinfo.partyUInfo);
4785 ret = encode_uvinfo(context, server, &otherinfo.partyVInfo);
4787 free(otherinfo.partyUInfo.data);
4792 otherinfo.algorithmID = *ai;
4793 otherinfo.suppPubInfo = &pub;
4795 ASN1_MALLOC_ENCODE(PkinitSP80056AOtherInfo, other->data, other->length,
4796 &otherinfo, &size, ret);
4797 free(otherinfo.partyUInfo.data);
4798 free(otherinfo.partyVInfo.data);
4801 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
4804 if (other->length != size)
4805 krb5_abortx(context, "asn1 compiler internal error");
4811 _krb5_pk_kdf(krb5_context context,
4812 const struct AlgorithmIdentifier *ai,
4815 krb5_const_principal client,
4816 krb5_const_principal server,
4817 krb5_enctype enctype,
4818 const krb5_data *as_req,
4819 const krb5_data *pk_as_rep,
4820 const Ticket *ticket,
4823 struct encryption_type *et;
4824 krb5_error_code ret;
4826 size_t keylen, offset;
4828 unsigned char *keydata;
4829 unsigned char shaoutput[SHA_DIGEST_LENGTH];
4832 if (der_heim_oid_cmp(&asn1_oid_id_pkinit_kdf_ah_sha1, &ai->algorithm) != 0) {
4833 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
4834 N_("KDF not supported", ""));
4835 return KRB5_PROG_ETYPE_NOSUPP;
4837 if (ai->parameters != NULL &&
4838 (ai->parameters->length != 2 ||
4839 memcmp(ai->parameters->data, "\x05\x00", 2) != 0))
4841 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
4842 N_("kdf params not NULL or the NULL-type",
4844 return KRB5_PROG_ETYPE_NOSUPP;
4847 et = _find_enctype(enctype);
4849 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
4850 N_("encryption type %d not supported", ""),
4852 return KRB5_PROG_ETYPE_NOSUPP;
4854 keylen = (et->keytype->bits + 7) / 8;
4856 keydata = malloc(keylen);
4857 if (keydata == NULL) {
4858 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
4862 ret = encode_otherinfo(context, ai, client, server,
4863 enctype, as_req, pk_as_rep, ticket, &other);
4869 m = EVP_MD_CTX_create();
4873 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
4880 unsigned char cdata[4];
4882 EVP_DigestInit_ex(m, EVP_sha1(), NULL);
4883 _krb5_put_int(cdata, counter, 4);
4884 EVP_DigestUpdate(m, cdata, 4);
4885 EVP_DigestUpdate(m, dhdata, dhsize);
4886 EVP_DigestUpdate(m, other.data, other.length);
4888 EVP_DigestFinal_ex(m, shaoutput, NULL);
4890 memcpy((unsigned char *)keydata + offset,
4892 min(keylen - offset, sizeof(shaoutput)));
4894 offset += sizeof(shaoutput);
4896 } while(offset < keylen);
4897 memset(shaoutput, 0, sizeof(shaoutput));
4899 EVP_MD_CTX_destroy(m);
4902 ret = krb5_random_to_key(context, enctype, keydata, keylen, key);
4903 memset(keydata, 0, sizeof(keylen));
4910 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4911 krb5_crypto_prf_length(krb5_context context,
4915 struct encryption_type *et = _find_enctype(type);
4917 if(et == NULL || et->prf_length == 0) {
4918 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
4919 N_("encryption type %d not supported", ""),
4921 return KRB5_PROG_ETYPE_NOSUPP;
4924 *length = et->prf_length;
4928 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
4929 krb5_crypto_prf(krb5_context context,
4930 const krb5_crypto crypto,
4931 const krb5_data *input,
4934 struct encryption_type *et = crypto->et;
4936 krb5_data_zero(output);
4938 if(et->prf == NULL) {
4939 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
4940 "kerberos prf for %s not supported",
4942 return KRB5_PROG_ETYPE_NOSUPP;
4945 return (*et->prf)(context, crypto, input, output);
4948 static krb5_error_code
4949 krb5_crypto_prfplus(krb5_context context,
4950 const krb5_crypto crypto,
4951 const krb5_data *input,
4955 krb5_error_code ret;
4957 unsigned char i = 1;
4960 krb5_data_zero(&input2);
4961 krb5_data_zero(output);
4963 krb5_clear_error_message(context);
4965 ret = krb5_data_alloc(output, length);
4967 ret = krb5_data_alloc(&input2, input->length + 1);
4970 krb5_clear_error_message(context);
4972 memcpy(((unsigned char *)input2.data) + 1, input->data, input->length);
4979 ((unsigned char *)input2.data)[0] = i++;
4981 ret = krb5_crypto_prf(context, crypto, &input2, &block);
4985 if (block.length < length) {
4986 memcpy(p, block.data, block.length);
4987 length -= block.length;
4989 memcpy(p, block.data, length);
4993 krb5_data_free(&block);
4997 krb5_data_free(&input2);
4999 krb5_data_free(output);
5004 * The FX-CF2 key derivation function, used in FAST and preauth framework.
5006 * @param context Kerberos 5 context
5007 * @param crypto1 first key to combine
5008 * @param crypto2 second key to combine
5009 * @param pepper1 factor to combine with first key to garante uniqueness
5010 * @param pepper2 factor to combine with second key to garante uniqueness
5011 * @param enctype the encryption type of the resulting key
5012 * @param res allocated key, free with krb5_free_keyblock_contents()
5014 * @return Return an error code or 0.
5016 * @ingroup krb5_crypto
5019 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
5020 krb5_crypto_fx_cf2(krb5_context context,
5021 const krb5_crypto crypto1,
5022 const krb5_crypto crypto2,
5025 krb5_enctype enctype,
5028 krb5_error_code ret;
5032 memset(res, 0, sizeof(*res));
5034 ret = krb5_enctype_keysize(context, enctype, &keysize);
5038 ret = krb5_data_alloc(&res->keyvalue, keysize);
5041 ret = krb5_crypto_prfplus(context, crypto1, pepper1, keysize, &os1);
5044 ret = krb5_crypto_prfplus(context, crypto2, pepper2, keysize, &os2);
5048 res->keytype = enctype;
5050 unsigned char *p1 = os1.data, *p2 = os2.data, *p3 = res->keyvalue.data;
5051 for (i = 0; i < keysize; i++)
5052 p3[i] = p1[i] ^ p2[i];
5056 krb5_data_free(&res->keyvalue);
5057 krb5_data_free(&os1);
5058 krb5_data_free(&os2);
5065 #ifndef HEIMDAL_SMALLER
5068 * Deprecated: keytypes doesn't exists, they are really enctypes.
5070 * @ingroup krb5_deprecated
5074 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
5075 krb5_keytype_to_enctypes (krb5_context context,
5076 krb5_keytype keytype,
5084 for (i = num_etypes - 1; i >= 0; --i) {
5085 if (etypes[i]->keytype->type == keytype
5086 && !(etypes[i]->flags & F_PSEUDO)
5087 && krb5_enctype_valid(context, etypes[i]->type) == 0)
5091 krb5_set_error_message(context, KRB5_PROG_KEYTYPE_NOSUPP,
5092 "Keytype have no mapping");
5093 return KRB5_PROG_KEYTYPE_NOSUPP;
5096 ret = malloc(n * sizeof(*ret));
5097 if (ret == NULL && n != 0) {
5098 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
5102 for (i = num_etypes - 1; i >= 0; --i) {
5103 if (etypes[i]->keytype->type == keytype
5104 && !(etypes[i]->flags & F_PSEUDO)
5105 && krb5_enctype_valid(context, etypes[i]->type) == 0)
5106 ret[n++] = etypes[i]->type;
5114 * Deprecated: keytypes doesn't exists, they are really enctypes.
5116 * @ingroup krb5_deprecated
5119 /* if two enctypes have compatible keys */
5121 KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
5122 krb5_enctypes_compatible_keys(krb5_context context,
5123 krb5_enctype etype1,
5124 krb5_enctype etype2)
5126 struct encryption_type *e1 = _find_enctype(etype1);
5127 struct encryption_type *e2 = _find_enctype(etype2);
5128 return e1 != NULL && e2 != NULL && e1->keytype == e2->keytype;
5131 #endif /* HEIMDAL_SMALLER */