2 * Copyright (c) 1997 - 2004 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "krb5_locl.h"
35 RCSID("$Id: crypto.c,v 1.73.2.4 2004/03/06 16:38:00 lha Exp $");
39 static void krb5_crypto_debug(krb5_context, int, size_t, krb5_keyblock*);
53 struct krb5_crypto_data {
54 struct encryption_type *et;
57 struct key_usage *key_usage;
60 #define 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 */
73 krb5_error_code (*string_to_key)(krb5_context, krb5_enctype, krb5_data,
74 krb5_salt, krb5_data, krb5_keyblock*);
78 krb5_keytype type; /* XXX */
84 krb5_enctype best_etype;
86 void (*random_key)(krb5_context, krb5_keyblock*);
87 void (*schedule)(krb5_context, struct key_data *);
88 struct salt_type *string_to_key;
91 struct checksum_type {
97 void (*checksum)(krb5_context context,
99 const void *buf, size_t len,
102 krb5_error_code (*verify)(krb5_context context,
103 struct key_data *key,
104 const void *buf, size_t len,
109 struct encryption_type {
114 size_t confoundersize;
115 struct key_type *keytype;
116 struct checksum_type *checksum;
117 struct checksum_type *keyed_checksum;
119 krb5_error_code (*encrypt)(krb5_context context,
120 struct key_data *key,
121 void *data, size_t len,
122 krb5_boolean encrypt,
127 #define ENCRYPTION_USAGE(U) (((U) << 8) | 0xAA)
128 #define INTEGRITY_USAGE(U) (((U) << 8) | 0x55)
129 #define CHECKSUM_USAGE(U) (((U) << 8) | 0x99)
131 static struct checksum_type *_find_checksum(krb5_cksumtype type);
132 static struct encryption_type *_find_enctype(krb5_enctype type);
133 static struct key_type *_find_keytype(krb5_keytype type);
134 static krb5_error_code _get_derived_key(krb5_context, krb5_crypto,
135 unsigned, struct key_data**);
136 static struct key_data *_new_derived_key(krb5_crypto crypto, unsigned usage);
137 static krb5_error_code derive_key(krb5_context context,
138 struct encryption_type *et,
139 struct key_data *key,
140 const void *constant,
142 static krb5_error_code hmac(krb5_context context,
143 struct checksum_type *cm,
147 struct key_data *keyblock,
149 static void free_key_data(krb5_context context, struct key_data *key);
150 static krb5_error_code usage2arcfour (krb5_context, int *);
152 /************************************************************
154 ************************************************************/
157 krb5_DES_random_key(krb5_context context,
160 des_cblock *k = key->keyvalue.data;
162 krb5_generate_random_block(k, sizeof(des_cblock));
163 des_set_odd_parity(k);
164 } while(des_is_weak_key(k));
168 krb5_DES_schedule(krb5_context context,
169 struct key_data *key)
171 des_set_key(key->key->keyvalue.data, key->schedule->data);
175 DES_string_to_key_int(unsigned char *data, size_t length, des_cblock *key)
177 des_key_schedule schedule;
182 unsigned char swap[] = { 0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
183 0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf };
186 p = (unsigned char*)key;
187 for (i = 0; i < length; i++) {
188 unsigned char tmp = data[i];
192 *--p ^= (swap[tmp & 0xf] << 4) | swap[(tmp & 0xf0) >> 4];
196 des_set_odd_parity(key);
197 if(des_is_weak_key(key))
199 des_set_key(key, schedule);
200 des_cbc_cksum((void*)data, key, length, schedule, key);
201 memset(schedule, 0, sizeof(schedule));
202 des_set_odd_parity(key);
205 static krb5_error_code
206 krb5_DES_string_to_key(krb5_context context,
207 krb5_enctype enctype,
217 len = password.length + salt.saltvalue.length;
219 if(len > 0 && s == NULL) {
220 krb5_set_error_string(context, "malloc: out of memory");
223 memcpy(s, password.data, password.length);
224 memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
225 DES_string_to_key_int(s, len, &tmp);
226 key->keytype = enctype;
227 krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
228 memset(&tmp, 0, sizeof(tmp));
234 /* This defines the Andrew string_to_key function. It accepts a password
235 * string as input and converts its via a one-way encryption algorithm to a DES
236 * encryption key. It is compatible with the original Andrew authentication
237 * service password database.
241 * Short passwords, i.e 8 characters or less.
244 krb5_DES_AFS3_CMU_string_to_key (krb5_data pw,
248 char password[8+1]; /* crypt is limited to 8 chars anyway */
251 for(i = 0; i < 8; i++) {
252 char c = ((i < pw.length) ? ((char*)pw.data)[i] : 0) ^
254 tolower(((unsigned char*)cell.data)[i]) : 0);
255 password[i] = c ? c : 'X';
259 memcpy(key, crypt(password, "p1") + 2, sizeof(des_cblock));
261 /* parity is inserted into the LSB so left shift each byte up one
262 bit. This allows ascii characters with a zero MSB to retain as
263 much significance as possible. */
264 for (i = 0; i < sizeof(des_cblock); i++)
265 ((unsigned char*)key)[i] <<= 1;
266 des_set_odd_parity (key);
270 * Long passwords, i.e 9 characters or more.
273 krb5_DES_AFS3_Transarc_string_to_key (krb5_data pw,
277 des_key_schedule schedule;
283 memcpy(password, pw.data, min(pw.length, sizeof(password)));
284 if(pw.length < sizeof(password)) {
285 int len = min(cell.length, sizeof(password) - pw.length);
288 memcpy(password + pw.length, cell.data, len);
289 for (i = pw.length; i < pw.length + len; ++i)
290 password[i] = tolower((unsigned char)password[i]);
292 passlen = min(sizeof(password), pw.length + cell.length);
293 memcpy(&ivec, "kerberos", 8);
294 memcpy(&temp_key, "kerberos", 8);
295 des_set_odd_parity (&temp_key);
296 des_set_key (&temp_key, schedule);
297 des_cbc_cksum (password, &ivec, passlen, schedule, &ivec);
299 memcpy(&temp_key, &ivec, 8);
300 des_set_odd_parity (&temp_key);
301 des_set_key (&temp_key, schedule);
302 des_cbc_cksum (password, key, passlen, schedule, &ivec);
303 memset(&schedule, 0, sizeof(schedule));
304 memset(&temp_key, 0, sizeof(temp_key));
305 memset(&ivec, 0, sizeof(ivec));
306 memset(password, 0, sizeof(password));
308 des_set_odd_parity (key);
311 static krb5_error_code
312 DES_AFS3_string_to_key(krb5_context context,
313 krb5_enctype enctype,
320 if(password.length > 8)
321 krb5_DES_AFS3_Transarc_string_to_key(password, salt.saltvalue, &tmp);
323 krb5_DES_AFS3_CMU_string_to_key(password, salt.saltvalue, &tmp);
324 key->keytype = enctype;
325 krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
326 memset(&key, 0, sizeof(key));
331 DES3_random_key(krb5_context context,
334 des_cblock *k = key->keyvalue.data;
336 krb5_generate_random_block(k, 3 * sizeof(des_cblock));
337 des_set_odd_parity(&k[0]);
338 des_set_odd_parity(&k[1]);
339 des_set_odd_parity(&k[2]);
340 } while(des_is_weak_key(&k[0]) ||
341 des_is_weak_key(&k[1]) ||
342 des_is_weak_key(&k[2]));
346 DES3_schedule(krb5_context context,
347 struct key_data *key)
349 des_cblock *k = key->key->keyvalue.data;
350 des_key_schedule *s = key->schedule->data;
351 des_set_key(&k[0], s[0]);
352 des_set_key(&k[1], s[1]);
353 des_set_key(&k[2], s[2]);
357 * A = A xor B. A & B are 8 bytes.
361 xor (des_cblock *key, const unsigned char *b)
363 unsigned char *a = (unsigned char*)key;
374 static krb5_error_code
375 DES3_string_to_key(krb5_context context,
376 krb5_enctype enctype,
384 unsigned char tmp[24];
387 len = password.length + salt.saltvalue.length;
389 if(len != 0 && str == NULL) {
390 krb5_set_error_string(context, "malloc: out of memory");
393 memcpy(str, password.data, password.length);
394 memcpy(str + password.length, salt.saltvalue.data, salt.saltvalue.length);
397 des_key_schedule s[3];
400 _krb5_n_fold(str, len, tmp, 24);
402 for(i = 0; i < 3; i++){
403 memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
404 des_set_odd_parity(keys + i);
405 if(des_is_weak_key(keys + i))
406 xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
407 des_set_key(keys + i, s[i]);
409 memset(&ivec, 0, sizeof(ivec));
410 des_ede3_cbc_encrypt(tmp,
412 s[0], s[1], s[2], &ivec, DES_ENCRYPT);
413 memset(s, 0, sizeof(s));
414 memset(&ivec, 0, sizeof(ivec));
415 for(i = 0; i < 3; i++){
416 memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
417 des_set_odd_parity(keys + i);
418 if(des_is_weak_key(keys + i))
419 xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
421 memset(tmp, 0, sizeof(tmp));
423 key->keytype = enctype;
424 krb5_data_copy(&key->keyvalue, keys, sizeof(keys));
425 memset(keys, 0, sizeof(keys));
431 static krb5_error_code
432 DES3_string_to_key_derived(krb5_context context,
433 krb5_enctype enctype,
440 size_t len = password.length + salt.saltvalue.length;
444 if(len != 0 && s == NULL) {
445 krb5_set_error_string(context, "malloc: out of memory");
448 memcpy(s, password.data, password.length);
449 memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
450 ret = krb5_string_to_key_derived(context,
465 ARCFOUR_random_key(krb5_context context, krb5_keyblock *key)
467 krb5_generate_random_block (key->keyvalue.data,
468 key->keyvalue.length);
472 ARCFOUR_schedule(krb5_context context, struct key_data *kd)
474 RC4_set_key (kd->schedule->data,
475 kd->key->keyvalue.length, kd->key->keyvalue.data);
478 static krb5_error_code
479 ARCFOUR_string_to_key(krb5_context context,
480 krb5_enctype enctype,
491 len = 2 * password.length;
493 if (len != 0 && s == NULL) {
494 krb5_set_error_string(context, "malloc: out of memory");
497 for (p = s, i = 0; i < password.length; ++i) {
498 *p++ = ((char *)password.data)[i];
502 MD4_Update (&m, s, len);
503 key->keytype = enctype;
504 krb5_data_alloc (&key->keyvalue, 16);
505 MD4_Final (key->keyvalue.data, &m);
516 /* iter is really 1 based, so iter == 0 will be 1 iteration */
519 krb5_PKCS5_PBKDF2(krb5_context context, krb5_cksumtype cktype,
520 krb5_data password, krb5_salt salt, u_int32_t iter,
521 krb5_keytype type, krb5_keyblock *key)
523 struct checksum_type *c = _find_checksum(cktype);
525 size_t datalen, leftofkey;
528 struct key_data ksign;
531 char *data, *tmpcksum;
536 krb5_set_error_string(context, "checksum %d not supported", cktype);
537 return KRB5_PROG_KEYTYPE_NOSUPP;
540 kt = _find_keytype(type);
542 krb5_set_error_string(context, "key type %d not supported", type);
543 return KRB5_PROG_KEYTYPE_NOSUPP;
547 ret = krb5_data_alloc (&key->keyvalue, kt->bits / 8);
549 krb5_set_error_string(context, "malloc: out of memory");
553 ret = krb5_data_alloc (&result.checksum, c->checksumsize);
555 krb5_set_error_string(context, "malloc: out of memory");
556 krb5_data_free (&key->keyvalue);
560 tmpcksum = malloc(c->checksumsize);
561 if (tmpcksum == NULL) {
562 krb5_set_error_string(context, "malloc: out of memory");
563 krb5_data_free (&key->keyvalue);
564 krb5_data_free (&result.checksum);
568 datalen = salt.saltvalue.length + 4;
569 data = malloc(datalen);
571 krb5_set_error_string(context, "malloc: out of memory");
573 krb5_data_free (&key->keyvalue);
574 krb5_data_free (&result.checksum);
578 kb.keyvalue = password;
581 memcpy(data, salt.saltvalue.data, salt.saltvalue.length);
584 leftofkey = key->keyvalue.length;
585 p = key->keyvalue.data;
590 if (leftofkey > c->checksumsize)
591 len = c->checksumsize;
595 _krb5_put_int(data + datalen - 4, keypart, 4);
597 ret = hmac(context, c, data, datalen, 0, &ksign, &result);
599 krb5_abortx(context, "hmac failed");
600 memcpy(p, result.checksum.data, len);
601 memcpy(tmpcksum, result.checksum.data, result.checksum.length);
602 for (i = 0; i < iter; i++) {
603 ret = hmac(context, c, tmpcksum, result.checksum.length,
606 krb5_abortx(context, "hmac failed");
607 memcpy(tmpcksum, result.checksum.data, result.checksum.length);
608 for (j = 0; j < len; j++)
619 krb5_data_free (&result.checksum);
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)
639 else if (opaque.length == 4) {
641 _krb5_get_int(opaque.data, &v, 4);
642 iter = ((u_int32_t)v) - 1;
644 return KRB5_PROG_KEYTYPE_NOSUPP; /* XXX */
647 et = _find_enctype(enctype);
649 return KRB5_PROG_KEYTYPE_NOSUPP;
651 ret = krb5_PKCS5_PBKDF2(context, CKSUMTYPE_SHA1, password, salt,
656 ret = krb5_copy_keyblock(context, key, &kd.key);
659 ret = derive_key(context, et, &kd, "kerberos", strlen("kerberos"));
662 krb5_data_free(&key->keyvalue);
664 ret = krb5_copy_keyblock_contents(context, kd.key, key);
665 free_key_data(context, &kd);
672 AES_schedule(krb5_context context, struct key_data *kd)
674 AES_KEY *key = kd->schedule->data;
675 int bits = kd->key->keyvalue.length * 8;
677 AES_set_encrypt_key(kd->key->keyvalue.data, bits, &key[0]);
678 AES_set_decrypt_key(kd->key->keyvalue.data, bits, &key[1]);
685 extern struct salt_type AES_salt[];
687 #endif /* ENABLE_AES */
689 extern struct salt_type des_salt[],
690 des3_salt[], des3_salt_derived[], arcfour_salt[];
692 struct key_type keytype_null = {
703 struct key_type keytype_des = {
708 sizeof(des_key_schedule),
714 struct key_type keytype_des3 = {
718 3 * sizeof(des_cblock),
719 3 * sizeof(des_key_schedule),
725 struct key_type keytype_des3_derived = {
729 3 * sizeof(des_cblock),
730 3 * sizeof(des_key_schedule),
737 struct key_type keytype_aes128 = {
748 struct key_type keytype_aes256 = {
758 #endif /* ENABLE_AES */
760 struct key_type keytype_arcfour = {
771 struct key_type *keytypes[] = {
774 &keytype_des3_derived,
779 #endif /* ENABLE_AES */
783 static int num_keytypes = sizeof(keytypes) / sizeof(keytypes[0]);
785 static struct key_type *
786 _find_keytype(krb5_keytype type)
789 for(i = 0; i < num_keytypes; i++)
790 if(keytypes[i]->type == type)
796 struct salt_type des_salt[] = {
800 krb5_DES_string_to_key
805 DES_AFS3_string_to_key
810 struct salt_type des3_salt[] = {
819 struct salt_type des3_salt_derived[] = {
823 DES3_string_to_key_derived
829 struct salt_type AES_salt[] = {
837 #endif /* ENABLE_AES */
839 struct salt_type arcfour_salt[] = {
843 ARCFOUR_string_to_key
849 krb5_salttype_to_string (krb5_context context,
854 struct encryption_type *e;
855 struct salt_type *st;
857 e = _find_enctype (etype);
859 krb5_set_error_string(context, "encryption type %d not supported",
861 return KRB5_PROG_ETYPE_NOSUPP;
863 for (st = e->keytype->string_to_key; st && st->type; st++) {
864 if (st->type == stype) {
865 *string = strdup (st->name);
866 if (*string == NULL) {
867 krb5_set_error_string(context, "malloc: out of memory");
873 krb5_set_error_string(context, "salttype %d not supported", stype);
874 return HEIM_ERR_SALTTYPE_NOSUPP;
878 krb5_string_to_salttype (krb5_context context,
881 krb5_salttype *salttype)
883 struct encryption_type *e;
884 struct salt_type *st;
886 e = _find_enctype (etype);
888 krb5_set_error_string(context, "encryption type %d not supported",
890 return KRB5_PROG_ETYPE_NOSUPP;
892 for (st = e->keytype->string_to_key; st && st->type; st++) {
893 if (strcasecmp (st->name, string) == 0) {
894 *salttype = st->type;
898 krb5_set_error_string(context, "salttype %s not supported", string);
899 return HEIM_ERR_SALTTYPE_NOSUPP;
903 krb5_get_pw_salt(krb5_context context,
904 krb5_const_principal principal,
912 salt->salttype = KRB5_PW_SALT;
913 len = strlen(principal->realm);
914 for (i = 0; i < principal->name.name_string.len; ++i)
915 len += strlen(principal->name.name_string.val[i]);
916 ret = krb5_data_alloc (&salt->saltvalue, len);
919 p = salt->saltvalue.data;
920 memcpy (p, principal->realm, strlen(principal->realm));
921 p += strlen(principal->realm);
922 for (i = 0; i < principal->name.name_string.len; ++i) {
924 principal->name.name_string.val[i],
925 strlen(principal->name.name_string.val[i]));
926 p += strlen(principal->name.name_string.val[i]);
932 krb5_free_salt(krb5_context context,
935 krb5_data_free(&salt.saltvalue);
940 krb5_string_to_key_data (krb5_context context,
941 krb5_enctype enctype,
943 krb5_principal principal,
949 ret = krb5_get_pw_salt(context, principal, &salt);
952 ret = krb5_string_to_key_data_salt(context, enctype, password, salt, key);
953 krb5_free_salt(context, salt);
958 krb5_string_to_key (krb5_context context,
959 krb5_enctype enctype,
960 const char *password,
961 krb5_principal principal,
965 pw.data = (void*)password;
966 pw.length = strlen(password);
967 return krb5_string_to_key_data(context, enctype, pw, principal, key);
971 krb5_string_to_key_data_salt (krb5_context context,
972 krb5_enctype enctype,
978 krb5_data_zero(&opaque);
979 return krb5_string_to_key_data_salt_opaque(context, enctype, password,
984 * Do a string -> key for encryption type `enctype' operation on
985 * `password' (with salt `salt' and the enctype specific data string
986 * `opaque'), returning the resulting key in `key'
990 krb5_string_to_key_data_salt_opaque (krb5_context context,
991 krb5_enctype enctype,
997 struct encryption_type *et =_find_enctype(enctype);
998 struct salt_type *st;
1000 krb5_set_error_string(context, "encryption type %d not supported",
1002 return KRB5_PROG_ETYPE_NOSUPP;
1004 for(st = et->keytype->string_to_key; st && st->type; st++)
1005 if(st->type == salt.salttype)
1006 return (*st->string_to_key)(context, enctype, password,
1008 krb5_set_error_string(context, "salt type %d not supported",
1010 return HEIM_ERR_SALTTYPE_NOSUPP;
1014 * Do a string -> key for encryption type `enctype' operation on the
1015 * string `password' (with salt `salt'), returning the resulting key
1020 krb5_string_to_key_salt (krb5_context context,
1021 krb5_enctype enctype,
1022 const char *password,
1027 pw.data = (void*)password;
1028 pw.length = strlen(password);
1029 return krb5_string_to_key_data_salt(context, enctype, pw, salt, key);
1033 krb5_keytype_to_string(krb5_context context,
1034 krb5_keytype keytype,
1037 struct key_type *kt = _find_keytype(keytype);
1039 krb5_set_error_string(context, "key type %d not supported", keytype);
1040 return KRB5_PROG_KEYTYPE_NOSUPP;
1042 *string = strdup(kt->name);
1043 if(*string == NULL) {
1044 krb5_set_error_string(context, "malloc: out of memory");
1051 krb5_string_to_keytype(krb5_context context,
1053 krb5_keytype *keytype)
1056 for(i = 0; i < num_keytypes; i++)
1057 if(strcasecmp(keytypes[i]->name, string) == 0){
1058 *keytype = keytypes[i]->type;
1061 krb5_set_error_string(context, "key type %s not supported", string);
1062 return KRB5_PROG_KEYTYPE_NOSUPP;
1066 krb5_enctype_keysize(krb5_context context,
1070 struct encryption_type *et = _find_enctype(type);
1072 krb5_set_error_string(context, "encryption type %d not supported",
1074 return KRB5_PROG_ETYPE_NOSUPP;
1076 *keysize = et->keytype->size;
1081 krb5_generate_random_keyblock(krb5_context context,
1085 krb5_error_code ret;
1086 struct encryption_type *et = _find_enctype(type);
1088 krb5_set_error_string(context, "encryption type %d not supported",
1090 return KRB5_PROG_ETYPE_NOSUPP;
1092 ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
1095 key->keytype = type;
1096 if(et->keytype->random_key)
1097 (*et->keytype->random_key)(context, key);
1099 krb5_generate_random_block(key->keyvalue.data,
1100 key->keyvalue.length);
1104 static krb5_error_code
1105 _key_schedule(krb5_context context,
1106 struct key_data *key)
1108 krb5_error_code ret;
1109 struct encryption_type *et = _find_enctype(key->key->keytype);
1110 struct key_type *kt = et->keytype;
1112 if(kt->schedule == NULL)
1114 if (key->schedule != NULL)
1116 ALLOC(key->schedule, 1);
1117 if(key->schedule == NULL) {
1118 krb5_set_error_string(context, "malloc: out of memory");
1121 ret = krb5_data_alloc(key->schedule, kt->schedule_size);
1123 free(key->schedule);
1124 key->schedule = NULL;
1127 (*kt->schedule)(context, key);
1131 /************************************************************
1133 ************************************************************/
1136 NONE_checksum(krb5_context context,
1137 struct key_data *key,
1146 CRC32_checksum(krb5_context context,
1147 struct key_data *key,
1154 unsigned char *r = C->checksum.data;
1155 _krb5_crc_init_table ();
1156 crc = _krb5_crc_update (data, len, 0);
1158 r[1] = (crc >> 8) & 0xff;
1159 r[2] = (crc >> 16) & 0xff;
1160 r[3] = (crc >> 24) & 0xff;
1164 RSA_MD4_checksum(krb5_context context,
1165 struct key_data *key,
1174 MD4_Update (&m, data, len);
1175 MD4_Final (C->checksum.data, &m);
1179 RSA_MD4_DES_checksum(krb5_context context,
1180 struct key_data *key,
1188 unsigned char *p = cksum->checksum.data;
1190 krb5_generate_random_block(p, 8);
1192 MD4_Update (&md4, p, 8);
1193 MD4_Update (&md4, data, len);
1194 MD4_Final (p + 8, &md4);
1195 memset (&ivec, 0, sizeof(ivec));
1199 key->schedule->data,
1204 static krb5_error_code
1205 RSA_MD4_DES_verify(krb5_context context,
1206 struct key_data *key,
1213 unsigned char tmp[24];
1214 unsigned char res[16];
1216 krb5_error_code ret = 0;
1218 memset(&ivec, 0, sizeof(ivec));
1219 des_cbc_encrypt(C->checksum.data,
1222 key->schedule->data,
1226 MD4_Update (&md4, tmp, 8); /* confounder */
1227 MD4_Update (&md4, data, len);
1228 MD4_Final (res, &md4);
1229 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1230 krb5_clear_error_string (context);
1231 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1233 memset(tmp, 0, sizeof(tmp));
1234 memset(res, 0, sizeof(res));
1239 RSA_MD5_checksum(krb5_context context,
1240 struct key_data *key,
1249 MD5_Update(&m, data, len);
1250 MD5_Final (C->checksum.data, &m);
1254 RSA_MD5_DES_checksum(krb5_context context,
1255 struct key_data *key,
1263 unsigned char *p = C->checksum.data;
1265 krb5_generate_random_block(p, 8);
1267 MD5_Update (&md5, p, 8);
1268 MD5_Update (&md5, data, len);
1269 MD5_Final (p + 8, &md5);
1270 memset (&ivec, 0, sizeof(ivec));
1274 key->schedule->data,
1279 static krb5_error_code
1280 RSA_MD5_DES_verify(krb5_context context,
1281 struct key_data *key,
1288 unsigned char tmp[24];
1289 unsigned char res[16];
1291 des_key_schedule *sched = key->schedule->data;
1292 krb5_error_code ret = 0;
1294 memset(&ivec, 0, sizeof(ivec));
1295 des_cbc_encrypt(C->checksum.data,
1302 MD5_Update (&md5, tmp, 8); /* confounder */
1303 MD5_Update (&md5, data, len);
1304 MD5_Final (res, &md5);
1305 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1306 krb5_clear_error_string (context);
1307 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1309 memset(tmp, 0, sizeof(tmp));
1310 memset(res, 0, sizeof(res));
1315 RSA_MD5_DES3_checksum(krb5_context context,
1316 struct key_data *key,
1324 unsigned char *p = C->checksum.data;
1325 des_key_schedule *sched = key->schedule->data;
1327 krb5_generate_random_block(p, 8);
1329 MD5_Update (&md5, p, 8);
1330 MD5_Update (&md5, data, len);
1331 MD5_Final (p + 8, &md5);
1332 memset (&ivec, 0, sizeof(ivec));
1333 des_ede3_cbc_encrypt(p,
1336 sched[0], sched[1], sched[2],
1341 static krb5_error_code
1342 RSA_MD5_DES3_verify(krb5_context context,
1343 struct key_data *key,
1350 unsigned char tmp[24];
1351 unsigned char res[16];
1353 des_key_schedule *sched = key->schedule->data;
1354 krb5_error_code ret = 0;
1356 memset(&ivec, 0, sizeof(ivec));
1357 des_ede3_cbc_encrypt(C->checksum.data,
1360 sched[0], sched[1], sched[2],
1364 MD5_Update (&md5, tmp, 8); /* confounder */
1365 MD5_Update (&md5, data, len);
1366 MD5_Final (res, &md5);
1367 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1368 krb5_clear_error_string (context);
1369 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1371 memset(tmp, 0, sizeof(tmp));
1372 memset(res, 0, sizeof(res));
1377 SHA1_checksum(krb5_context context,
1378 struct key_data *key,
1387 SHA1_Update(&m, data, len);
1388 SHA1_Final(C->checksum.data, &m);
1391 /* HMAC according to RFC2104 */
1392 static krb5_error_code
1393 hmac(krb5_context context,
1394 struct checksum_type *cm,
1398 struct key_data *keyblock,
1401 unsigned char *ipad, *opad;
1406 ipad = malloc(cm->blocksize + len);
1409 opad = malloc(cm->blocksize + cm->checksumsize);
1414 memset(ipad, 0x36, cm->blocksize);
1415 memset(opad, 0x5c, cm->blocksize);
1417 if(keyblock->key->keyvalue.length > cm->blocksize){
1418 (*cm->checksum)(context,
1420 keyblock->key->keyvalue.data,
1421 keyblock->key->keyvalue.length,
1424 key = result->checksum.data;
1425 key_len = result->checksum.length;
1427 key = keyblock->key->keyvalue.data;
1428 key_len = keyblock->key->keyvalue.length;
1430 for(i = 0; i < key_len; i++){
1434 memcpy(ipad + cm->blocksize, data, len);
1435 (*cm->checksum)(context, keyblock, ipad, cm->blocksize + len,
1437 memcpy(opad + cm->blocksize, result->checksum.data,
1438 result->checksum.length);
1439 (*cm->checksum)(context, keyblock, opad,
1440 cm->blocksize + cm->checksumsize, usage, result);
1441 memset(ipad, 0, cm->blocksize + len);
1443 memset(opad, 0, cm->blocksize + cm->checksumsize);
1450 krb5_hmac(krb5_context context,
1451 krb5_cksumtype cktype,
1458 struct checksum_type *c = _find_checksum(cktype);
1460 krb5_error_code ret;
1463 krb5_set_error_string (context, "checksum type %d not supported",
1465 return KRB5_PROG_SUMTYPE_NOSUPP;
1471 ret = hmac(context, c, data, len, usage, &kd, result);
1474 krb5_free_data(context, kd.schedule);
1480 SP_HMAC_SHA1_checksum(krb5_context context,
1481 struct key_data *key,
1487 struct checksum_type *c = _find_checksum(CKSUMTYPE_SHA1);
1490 krb5_error_code ret;
1492 res.checksum.data = sha1_data;
1493 res.checksum.length = sizeof(sha1_data);
1495 ret = hmac(context, c, data, len, usage, key, &res);
1497 krb5_abortx(context, "hmac failed");
1498 memcpy(result->checksum.data, res.checksum.data, result->checksum.length);
1502 * checksum according to section 5. of draft-brezak-win2k-krb-rc4-hmac-03.txt
1506 HMAC_MD5_checksum(krb5_context context,
1507 struct key_data *key,
1514 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
1515 const char signature[] = "signaturekey";
1517 struct key_data ksign;
1520 unsigned char tmp[16];
1521 unsigned char ksign_c_data[16];
1522 krb5_error_code ret;
1524 ksign_c.checksum.length = sizeof(ksign_c_data);
1525 ksign_c.checksum.data = ksign_c_data;
1526 ret = hmac(context, c, signature, sizeof(signature), 0, key, &ksign_c);
1528 krb5_abortx(context, "hmac failed");
1530 kb.keyvalue = ksign_c.checksum;
1532 t[0] = (usage >> 0) & 0xFF;
1533 t[1] = (usage >> 8) & 0xFF;
1534 t[2] = (usage >> 16) & 0xFF;
1535 t[3] = (usage >> 24) & 0xFF;
1536 MD5_Update (&md5, t, 4);
1537 MD5_Update (&md5, data, len);
1538 MD5_Final (tmp, &md5);
1539 ret = hmac(context, c, tmp, sizeof(tmp), 0, &ksign, result);
1541 krb5_abortx(context, "hmac failed");
1545 * same as previous but being used while encrypting.
1549 HMAC_MD5_checksum_enc(krb5_context context,
1550 struct key_data *key,
1556 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
1558 struct key_data ksign;
1561 unsigned char ksign_c_data[16];
1562 krb5_error_code ret;
1564 t[0] = (usage >> 0) & 0xFF;
1565 t[1] = (usage >> 8) & 0xFF;
1566 t[2] = (usage >> 16) & 0xFF;
1567 t[3] = (usage >> 24) & 0xFF;
1569 ksign_c.checksum.length = sizeof(ksign_c_data);
1570 ksign_c.checksum.data = ksign_c_data;
1571 ret = hmac(context, c, t, sizeof(t), 0, key, &ksign_c);
1573 krb5_abortx(context, "hmac failed");
1575 kb.keyvalue = ksign_c.checksum;
1576 ret = hmac(context, c, data, len, 0, &ksign, result);
1578 krb5_abortx(context, "hmac failed");
1581 struct checksum_type checksum_none = {
1590 struct checksum_type checksum_crc32 = {
1599 struct checksum_type checksum_rsa_md4 = {
1608 struct checksum_type checksum_rsa_md4_des = {
1609 CKSUMTYPE_RSA_MD4_DES,
1613 F_KEYED | F_CPROOF | F_VARIANT,
1614 RSA_MD4_DES_checksum,
1618 struct checksum_type checksum_des_mac = {
1626 struct checksum_type checksum_des_mac_k = {
1627 CKSUMTYPE_DES_MAC_K,
1634 struct checksum_type checksum_rsa_md4_des_k = {
1635 CKSUMTYPE_RSA_MD4_DES_K,
1640 RSA_MD4_DES_K_checksum,
1641 RSA_MD4_DES_K_verify
1644 struct checksum_type checksum_rsa_md5 = {
1653 struct checksum_type checksum_rsa_md5_des = {
1654 CKSUMTYPE_RSA_MD5_DES,
1658 F_KEYED | F_CPROOF | F_VARIANT,
1659 RSA_MD5_DES_checksum,
1662 struct checksum_type checksum_rsa_md5_des3 = {
1663 CKSUMTYPE_RSA_MD5_DES3,
1667 F_KEYED | F_CPROOF | F_VARIANT,
1668 RSA_MD5_DES3_checksum,
1671 struct checksum_type checksum_sha1 = {
1680 struct checksum_type checksum_hmac_sha1_des3 = {
1681 CKSUMTYPE_HMAC_SHA1_DES3,
1685 F_KEYED | F_CPROOF | F_DERIVED,
1686 SP_HMAC_SHA1_checksum,
1691 struct checksum_type checksum_hmac_sha1_aes128 = {
1692 CKSUMTYPE_HMAC_SHA1_96_AES_128,
1693 "hmac-sha1-96-aes128",
1696 F_KEYED | F_CPROOF | F_DERIVED,
1697 SP_HMAC_SHA1_checksum,
1701 struct checksum_type checksum_hmac_sha1_aes256 = {
1702 CKSUMTYPE_HMAC_SHA1_96_AES_256,
1703 "hmac-sha1-96-aes256",
1706 F_KEYED | F_CPROOF | F_DERIVED,
1707 SP_HMAC_SHA1_checksum,
1710 #endif /* ENABLE_AES */
1712 struct checksum_type checksum_hmac_md5 = {
1722 struct checksum_type checksum_hmac_md5_enc = {
1723 CKSUMTYPE_HMAC_MD5_ENC,
1727 F_KEYED | F_CPROOF | F_PSEUDO,
1728 HMAC_MD5_checksum_enc,
1732 struct checksum_type *checksum_types[] = {
1736 &checksum_rsa_md4_des,
1739 &checksum_des_mac_k,
1740 &checksum_rsa_md4_des_k,
1743 &checksum_rsa_md5_des,
1744 &checksum_rsa_md5_des3,
1746 &checksum_hmac_sha1_des3,
1748 &checksum_hmac_sha1_aes128,
1749 &checksum_hmac_sha1_aes256,
1752 &checksum_hmac_md5_enc
1755 static int num_checksums = sizeof(checksum_types) / sizeof(checksum_types[0]);
1757 static struct checksum_type *
1758 _find_checksum(krb5_cksumtype type)
1761 for(i = 0; i < num_checksums; i++)
1762 if(checksum_types[i]->type == type)
1763 return checksum_types[i];
1767 static krb5_error_code
1768 get_checksum_key(krb5_context context,
1770 unsigned usage, /* not krb5_key_usage */
1771 struct checksum_type *ct,
1772 struct key_data **key)
1774 krb5_error_code ret = 0;
1776 if(ct->flags & F_DERIVED)
1777 ret = _get_derived_key(context, crypto, usage, key);
1778 else if(ct->flags & F_VARIANT) {
1781 *key = _new_derived_key(crypto, 0xff/* KRB5_KU_RFC1510_VARIANT */);
1783 krb5_set_error_string(context, "malloc: out of memory");
1786 ret = krb5_copy_keyblock(context, crypto->key.key, &(*key)->key);
1789 for(i = 0; i < (*key)->key->keyvalue.length; i++)
1790 ((unsigned char*)(*key)->key->keyvalue.data)[i] ^= 0xF0;
1792 *key = &crypto->key;
1795 ret = _key_schedule(context, *key);
1799 static krb5_error_code
1800 create_checksum (krb5_context context,
1801 struct checksum_type *ct,
1808 krb5_error_code ret;
1809 struct key_data *dkey;
1812 keyed_checksum = (ct->flags & F_KEYED) != 0;
1813 if(keyed_checksum && crypto == NULL) {
1814 krb5_clear_error_string (context);
1815 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
1817 if(keyed_checksum) {
1818 ret = get_checksum_key(context, crypto, usage, ct, &dkey);
1823 result->cksumtype = ct->type;
1824 krb5_data_alloc(&result->checksum, ct->checksumsize);
1825 (*ct->checksum)(context, dkey, data, len, usage, result);
1830 arcfour_checksum_p(struct checksum_type *ct, krb5_crypto crypto)
1832 return (ct->type == CKSUMTYPE_HMAC_MD5) &&
1833 (crypto->key.key->keytype == KEYTYPE_ARCFOUR);
1837 krb5_create_checksum(krb5_context context,
1839 krb5_key_usage usage,
1845 struct checksum_type *ct = NULL;
1848 /* type 0 -> pick from crypto */
1850 ct = _find_checksum(type);
1851 } else if (crypto) {
1852 ct = crypto->et->keyed_checksum;
1854 ct = crypto->et->checksum;
1858 krb5_set_error_string (context, "checksum type %d not supported",
1860 return KRB5_PROG_SUMTYPE_NOSUPP;
1863 if (arcfour_checksum_p(ct, crypto)) {
1865 usage2arcfour(context, &keyusage);
1867 keyusage = CHECKSUM_USAGE(usage);
1869 return create_checksum(context, ct, crypto, keyusage,
1873 static krb5_error_code
1874 verify_checksum(krb5_context context,
1876 unsigned usage, /* not krb5_key_usage */
1881 krb5_error_code ret;
1882 struct key_data *dkey;
1885 struct checksum_type *ct;
1887 ct = _find_checksum(cksum->cksumtype);
1889 krb5_set_error_string (context, "checksum type %d not supported",
1891 return KRB5_PROG_SUMTYPE_NOSUPP;
1893 if(ct->checksumsize != cksum->checksum.length) {
1894 krb5_clear_error_string (context);
1895 return KRB5KRB_AP_ERR_BAD_INTEGRITY; /* XXX */
1897 keyed_checksum = (ct->flags & F_KEYED) != 0;
1898 if(keyed_checksum && crypto == NULL) {
1899 krb5_clear_error_string (context);
1900 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
1903 ret = get_checksum_key(context, crypto, usage, ct, &dkey);
1907 return (*ct->verify)(context, dkey, data, len, usage, cksum);
1909 ret = krb5_data_alloc (&c.checksum, ct->checksumsize);
1913 (*ct->checksum)(context, dkey, data, len, usage, &c);
1915 if(c.checksum.length != cksum->checksum.length ||
1916 memcmp(c.checksum.data, cksum->checksum.data, c.checksum.length)) {
1917 krb5_clear_error_string (context);
1918 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1922 krb5_data_free (&c.checksum);
1927 krb5_verify_checksum(krb5_context context,
1929 krb5_key_usage usage,
1934 struct checksum_type *ct;
1937 ct = _find_checksum(cksum->cksumtype);
1939 krb5_set_error_string (context, "checksum type %d not supported",
1941 return KRB5_PROG_SUMTYPE_NOSUPP;
1944 if (arcfour_checksum_p(ct, crypto)) {
1946 usage2arcfour(context, &keyusage);
1948 keyusage = CHECKSUM_USAGE(usage);
1950 return verify_checksum(context, crypto, keyusage,
1955 krb5_checksumsize(krb5_context context,
1956 krb5_cksumtype type,
1959 struct checksum_type *ct = _find_checksum(type);
1961 krb5_set_error_string (context, "checksum type %d not supported",
1963 return KRB5_PROG_SUMTYPE_NOSUPP;
1965 *size = ct->checksumsize;
1970 krb5_checksum_is_keyed(krb5_context context,
1971 krb5_cksumtype type)
1973 struct checksum_type *ct = _find_checksum(type);
1975 krb5_set_error_string (context, "checksum type %d not supported",
1977 return KRB5_PROG_SUMTYPE_NOSUPP;
1979 return ct->flags & F_KEYED;
1983 krb5_checksum_is_collision_proof(krb5_context context,
1984 krb5_cksumtype type)
1986 struct checksum_type *ct = _find_checksum(type);
1988 krb5_set_error_string (context, "checksum type %d not supported",
1990 return KRB5_PROG_SUMTYPE_NOSUPP;
1992 return ct->flags & F_CPROOF;
1995 /************************************************************
1997 ************************************************************/
1999 static krb5_error_code
2000 NULL_encrypt(krb5_context context,
2001 struct key_data *key,
2004 krb5_boolean encrypt,
2011 static krb5_error_code
2012 DES_CBC_encrypt_null_ivec(krb5_context context,
2013 struct key_data *key,
2016 krb5_boolean encrypt,
2021 des_key_schedule *s = key->schedule->data;
2022 memset(&ivec, 0, sizeof(ivec));
2023 des_cbc_encrypt(data, data, len, *s, &ivec, encrypt);
2027 static krb5_error_code
2028 DES_CBC_encrypt_key_ivec(krb5_context context,
2029 struct key_data *key,
2032 krb5_boolean encrypt,
2037 des_key_schedule *s = key->schedule->data;
2038 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
2039 des_cbc_encrypt(data, data, len, *s, &ivec, encrypt);
2043 static krb5_error_code
2044 DES3_CBC_encrypt(krb5_context context,
2045 struct key_data *key,
2048 krb5_boolean encrypt,
2052 des_cblock local_ivec;
2053 des_key_schedule *s = key->schedule->data;
2056 memset(local_ivec, 0, sizeof(local_ivec));
2058 des_ede3_cbc_encrypt(data, data, len, s[0], s[1], s[2], ivec, encrypt);
2062 static krb5_error_code
2063 DES_CFB64_encrypt_null_ivec(krb5_context context,
2064 struct key_data *key,
2067 krb5_boolean encrypt,
2073 des_key_schedule *s = key->schedule->data;
2074 memset(&ivec, 0, sizeof(ivec));
2076 des_cfb64_encrypt(data, data, len, *s, &ivec, &num, encrypt);
2080 static krb5_error_code
2081 DES_PCBC_encrypt_key_ivec(krb5_context context,
2082 struct key_data *key,
2085 krb5_boolean encrypt,
2090 des_key_schedule *s = key->schedule->data;
2091 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
2093 des_pcbc_encrypt(data, data, len, *s, &ivec, encrypt);
2100 * AES draft-raeburn-krb-rijndael-krb-02
2104 _krb5_aes_cts_encrypt(const unsigned char *in, unsigned char *out,
2105 size_t len, const void *aes_key,
2106 unsigned char *ivec, const int enc)
2108 unsigned char tmp[AES_BLOCK_SIZE];
2109 const AES_KEY *key = aes_key; /* XXX remove this when we always have AES */
2113 * In the framework of kerberos, the length can never be shorter
2114 * then at least one blocksize.
2117 if (enc == AES_ENCRYPT) {
2119 while(len > AES_BLOCK_SIZE) {
2120 for (i = 0; i < AES_BLOCK_SIZE; i++)
2121 tmp[i] = in[i] ^ ivec[i];
2122 AES_encrypt(tmp, out, key);
2123 memcpy(ivec, out, AES_BLOCK_SIZE);
2124 len -= AES_BLOCK_SIZE;
2125 in += AES_BLOCK_SIZE;
2126 out += AES_BLOCK_SIZE;
2129 for (i = 0; i < len; i++)
2130 tmp[i] = in[i] ^ ivec[i];
2131 for (; i < AES_BLOCK_SIZE; i++)
2132 tmp[i] = 0 ^ ivec[i];
2134 AES_encrypt(tmp, out - AES_BLOCK_SIZE, key);
2136 memcpy(out, ivec, len);
2139 char tmp2[AES_BLOCK_SIZE];
2140 char tmp3[AES_BLOCK_SIZE];
2142 while(len > AES_BLOCK_SIZE * 2) {
2143 memcpy(tmp, in, AES_BLOCK_SIZE);
2144 AES_decrypt(in, out, key);
2145 for (i = 0; i < AES_BLOCK_SIZE; i++)
2147 memcpy(ivec, tmp, AES_BLOCK_SIZE);
2148 len -= AES_BLOCK_SIZE;
2149 in += AES_BLOCK_SIZE;
2150 out += AES_BLOCK_SIZE;
2153 len -= AES_BLOCK_SIZE;
2155 AES_decrypt(in, tmp2, key);
2157 memcpy(tmp3, in + AES_BLOCK_SIZE, len);
2158 memcpy(tmp3 + len, tmp2 + len, AES_BLOCK_SIZE - len); /* xor 0 */
2160 for (i = 0; i < len; i++)
2161 out[i + AES_BLOCK_SIZE] = tmp2[i] ^ tmp3[i];
2163 AES_decrypt(tmp3, out, key);
2164 for (i = 0; i < AES_BLOCK_SIZE; i++)
2169 static krb5_error_code
2170 AES_CTS_encrypt(krb5_context context,
2171 struct key_data *key,
2174 krb5_boolean encrypt,
2178 AES_KEY *k = key->schedule->data;
2179 char local_ivec[AES_BLOCK_SIZE];
2186 if (len < AES_BLOCK_SIZE)
2187 krb5_abortx(context, "invalid use of AES_CTS_encrypt");
2188 if (len == AES_BLOCK_SIZE) {
2190 AES_encrypt(data, data, k);
2192 AES_decrypt(data, data, k);
2195 memset(local_ivec, 0, sizeof(local_ivec));
2198 _krb5_aes_cts_encrypt(data, data, len, k, ivec, encrypt);
2203 #endif /* ENABLE_AES */
2206 * section 6 of draft-brezak-win2k-krb-rc4-hmac-03
2208 * warning: not for small children
2211 static krb5_error_code
2212 ARCFOUR_subencrypt(krb5_context context,
2213 struct key_data *key,
2219 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
2220 Checksum k1_c, k2_c, k3_c, cksum;
2225 unsigned char *cdata = data;
2226 unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
2227 krb5_error_code ret;
2229 t[0] = (usage >> 0) & 0xFF;
2230 t[1] = (usage >> 8) & 0xFF;
2231 t[2] = (usage >> 16) & 0xFF;
2232 t[3] = (usage >> 24) & 0xFF;
2234 k1_c.checksum.length = sizeof(k1_c_data);
2235 k1_c.checksum.data = k1_c_data;
2237 ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
2239 krb5_abortx(context, "hmac failed");
2241 memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
2243 k2_c.checksum.length = sizeof(k2_c_data);
2244 k2_c.checksum.data = k2_c_data;
2247 kb.keyvalue = k2_c.checksum;
2249 cksum.checksum.length = 16;
2250 cksum.checksum.data = data;
2252 ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
2254 krb5_abortx(context, "hmac failed");
2257 kb.keyvalue = k1_c.checksum;
2259 k3_c.checksum.length = sizeof(k3_c_data);
2260 k3_c.checksum.data = k3_c_data;
2262 ret = hmac(NULL, c, data, 16, 0, &ke, &k3_c);
2264 krb5_abortx(context, "hmac failed");
2266 RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data);
2267 RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16);
2268 memset (k1_c_data, 0, sizeof(k1_c_data));
2269 memset (k2_c_data, 0, sizeof(k2_c_data));
2270 memset (k3_c_data, 0, sizeof(k3_c_data));
2274 static krb5_error_code
2275 ARCFOUR_subdecrypt(krb5_context context,
2276 struct key_data *key,
2282 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
2283 Checksum k1_c, k2_c, k3_c, cksum;
2288 unsigned char *cdata = data;
2289 unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
2290 unsigned char cksum_data[16];
2291 krb5_error_code ret;
2293 t[0] = (usage >> 0) & 0xFF;
2294 t[1] = (usage >> 8) & 0xFF;
2295 t[2] = (usage >> 16) & 0xFF;
2296 t[3] = (usage >> 24) & 0xFF;
2298 k1_c.checksum.length = sizeof(k1_c_data);
2299 k1_c.checksum.data = k1_c_data;
2301 ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
2303 krb5_abortx(context, "hmac failed");
2305 memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
2307 k2_c.checksum.length = sizeof(k2_c_data);
2308 k2_c.checksum.data = k2_c_data;
2311 kb.keyvalue = k1_c.checksum;
2313 k3_c.checksum.length = sizeof(k3_c_data);
2314 k3_c.checksum.data = k3_c_data;
2316 ret = hmac(NULL, c, cdata, 16, 0, &ke, &k3_c);
2318 krb5_abortx(context, "hmac failed");
2320 RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data);
2321 RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16);
2324 kb.keyvalue = k2_c.checksum;
2326 cksum.checksum.length = 16;
2327 cksum.checksum.data = cksum_data;
2329 ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
2331 krb5_abortx(context, "hmac failed");
2333 memset (k1_c_data, 0, sizeof(k1_c_data));
2334 memset (k2_c_data, 0, sizeof(k2_c_data));
2335 memset (k3_c_data, 0, sizeof(k3_c_data));
2337 if (memcmp (cksum.checksum.data, data, 16) != 0) {
2338 krb5_clear_error_string (context);
2339 return KRB5KRB_AP_ERR_BAD_INTEGRITY;
2346 * convert the usage numbers used in
2347 * draft-ietf-cat-kerb-key-derivation-00.txt to the ones in
2348 * draft-brezak-win2k-krb-rc4-hmac-04.txt
2351 static krb5_error_code
2352 usage2arcfour (krb5_context context, int *usage)
2355 case KRB5_KU_AS_REP_ENC_PART : /* 3 */
2356 case KRB5_KU_TGS_REP_ENC_PART_SUB_KEY : /* 9 */
2359 case KRB5_KU_USAGE_SEAL : /* 22 */
2362 case KRB5_KU_USAGE_SIGN : /* 23 */
2365 case KRB5_KU_USAGE_SEQ: /* 24 */
2373 static krb5_error_code
2374 ARCFOUR_encrypt(krb5_context context,
2375 struct key_data *key,
2378 krb5_boolean encrypt,
2382 krb5_error_code ret;
2383 if((ret = usage2arcfour (context, &usage)) != 0)
2387 return ARCFOUR_subencrypt (context, key, data, len, usage, ivec);
2389 return ARCFOUR_subdecrypt (context, key, data, len, usage, ivec);
2394 * these should currently be in reverse preference order.
2395 * (only relevant for !F_PSEUDO) */
2397 static struct encryption_type enctype_null = {
2409 static struct encryption_type enctype_des_cbc_crc = {
2419 DES_CBC_encrypt_key_ivec,
2421 static struct encryption_type enctype_des_cbc_md4 = {
2429 &checksum_rsa_md4_des,
2431 DES_CBC_encrypt_null_ivec,
2433 static struct encryption_type enctype_des_cbc_md5 = {
2441 &checksum_rsa_md5_des,
2443 DES_CBC_encrypt_null_ivec,
2445 static struct encryption_type enctype_arcfour_hmac_md5 = {
2446 ETYPE_ARCFOUR_HMAC_MD5,
2453 /* &checksum_hmac_md5_enc */ NULL,
2457 static struct encryption_type enctype_des3_cbc_md5 = {
2465 &checksum_rsa_md5_des3,
2469 static struct encryption_type enctype_des3_cbc_sha1 = {
2470 ETYPE_DES3_CBC_SHA1,
2475 &keytype_des3_derived,
2477 &checksum_hmac_sha1_des3,
2481 static struct encryption_type enctype_old_des3_cbc_sha1 = {
2482 ETYPE_OLD_DES3_CBC_SHA1,
2483 "old-des3-cbc-sha1",
2489 &checksum_hmac_sha1_des3,
2494 static struct encryption_type enctype_aes128_cts_hmac_sha1 = {
2495 ETYPE_AES128_CTS_HMAC_SHA1_96,
2496 "aes128-cts-hmac-sha1-96",
2502 &checksum_hmac_sha1_aes128,
2506 static struct encryption_type enctype_aes256_cts_hmac_sha1 = {
2507 ETYPE_AES256_CTS_HMAC_SHA1_96,
2508 "aes256-cts-hmac-sha1-96",
2514 &checksum_hmac_sha1_aes256,
2518 #endif /* ENABLE_AES */
2519 static struct encryption_type enctype_des_cbc_none = {
2529 DES_CBC_encrypt_null_ivec,
2531 static struct encryption_type enctype_des_cfb64_none = {
2532 ETYPE_DES_CFB64_NONE,
2541 DES_CFB64_encrypt_null_ivec,
2543 static struct encryption_type enctype_des_pcbc_none = {
2544 ETYPE_DES_PCBC_NONE,
2553 DES_PCBC_encrypt_key_ivec,
2555 static struct encryption_type enctype_des3_cbc_none = {
2556 ETYPE_DES3_CBC_NONE,
2561 &keytype_des3_derived,
2568 static struct encryption_type *etypes[] = {
2570 &enctype_des_cbc_crc,
2571 &enctype_des_cbc_md4,
2572 &enctype_des_cbc_md5,
2573 &enctype_arcfour_hmac_md5,
2574 &enctype_des3_cbc_md5,
2575 &enctype_des3_cbc_sha1,
2576 &enctype_old_des3_cbc_sha1,
2578 &enctype_aes128_cts_hmac_sha1,
2579 &enctype_aes256_cts_hmac_sha1,
2581 &enctype_des_cbc_none,
2582 &enctype_des_cfb64_none,
2583 &enctype_des_pcbc_none,
2584 &enctype_des3_cbc_none
2587 static unsigned num_etypes = sizeof(etypes) / sizeof(etypes[0]);
2590 static struct encryption_type *
2591 _find_enctype(krb5_enctype type)
2594 for(i = 0; i < num_etypes; i++)
2595 if(etypes[i]->type == type)
2602 krb5_enctype_to_string(krb5_context context,
2606 struct encryption_type *e;
2607 e = _find_enctype(etype);
2609 krb5_set_error_string (context, "encryption type %d not supported",
2611 return KRB5_PROG_ETYPE_NOSUPP;
2613 *string = strdup(e->name);
2614 if(*string == NULL) {
2615 krb5_set_error_string(context, "malloc: out of memory");
2622 krb5_string_to_enctype(krb5_context context,
2624 krb5_enctype *etype)
2627 for(i = 0; i < num_etypes; i++)
2628 if(strcasecmp(etypes[i]->name, string) == 0){
2629 *etype = etypes[i]->type;
2632 krb5_set_error_string (context, "encryption type %s not supported",
2634 return KRB5_PROG_ETYPE_NOSUPP;
2638 krb5_enctype_to_keytype(krb5_context context,
2640 krb5_keytype *keytype)
2642 struct encryption_type *e = _find_enctype(etype);
2644 krb5_set_error_string (context, "encryption type %d not supported",
2646 return KRB5_PROG_ETYPE_NOSUPP;
2648 *keytype = e->keytype->type; /* XXX */
2654 krb5_keytype_to_enctype(krb5_context context,
2655 krb5_keytype keytype,
2656 krb5_enctype *etype)
2658 struct key_type *kt = _find_keytype(keytype);
2659 krb5_warnx(context, "krb5_keytype_to_enctype(%u)", keytype);
2661 return KRB5_PROG_KEYTYPE_NOSUPP;
2662 *etype = kt->best_etype;
2668 krb5_keytype_to_enctypes (krb5_context context,
2669 krb5_keytype keytype,
2677 for (i = num_etypes - 1; i >= 0; --i) {
2678 if (etypes[i]->keytype->type == keytype
2679 && !(etypes[i]->flags & F_PSEUDO))
2682 ret = malloc(n * sizeof(*ret));
2683 if (ret == NULL && n != 0) {
2684 krb5_set_error_string(context, "malloc: out of memory");
2688 for (i = num_etypes - 1; i >= 0; --i) {
2689 if (etypes[i]->keytype->type == keytype
2690 && !(etypes[i]->flags & F_PSEUDO))
2691 ret[n++] = etypes[i]->type;
2699 * First take the configured list of etypes for `keytype' if available,
2700 * else, do `krb5_keytype_to_enctypes'.
2704 krb5_keytype_to_enctypes_default (krb5_context context,
2705 krb5_keytype keytype,
2712 if (keytype != KEYTYPE_DES || context->etypes_des == NULL)
2713 return krb5_keytype_to_enctypes (context, keytype, len, val);
2715 for (n = 0; context->etypes_des[n]; ++n)
2717 ret = malloc (n * sizeof(*ret));
2718 if (ret == NULL && n != 0) {
2719 krb5_set_error_string(context, "malloc: out of memory");
2722 for (i = 0; i < n; ++i)
2723 ret[i] = context->etypes_des[i];
2730 krb5_enctype_valid(krb5_context context,
2733 return _find_enctype(etype) != NULL;
2736 /* if two enctypes have compatible keys */
2738 krb5_enctypes_compatible_keys(krb5_context context,
2739 krb5_enctype etype1,
2740 krb5_enctype etype2)
2742 struct encryption_type *e1 = _find_enctype(etype1);
2743 struct encryption_type *e2 = _find_enctype(etype2);
2744 return e1 != NULL && e2 != NULL && e1->keytype == e2->keytype;
2748 derived_crypto(krb5_context context,
2751 return (crypto->et->flags & F_DERIVED) != 0;
2755 special_crypto(krb5_context context,
2758 return (crypto->et->flags & F_SPECIAL) != 0;
2761 #define CHECKSUMSIZE(C) ((C)->checksumsize)
2762 #define CHECKSUMTYPE(C) ((C)->type)
2764 static krb5_error_code
2765 encrypt_internal_derived(krb5_context context,
2773 size_t sz, block_sz, checksum_sz, total_sz;
2775 unsigned char *p, *q;
2776 krb5_error_code ret;
2777 struct key_data *dkey;
2778 const struct encryption_type *et = crypto->et;
2780 checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
2782 sz = et->confoundersize + len;
2783 block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
2784 total_sz = block_sz + checksum_sz;
2785 p = calloc(1, total_sz);
2787 krb5_set_error_string(context, "malloc: out of memory");
2792 krb5_generate_random_block(q, et->confoundersize); /* XXX */
2793 q += et->confoundersize;
2794 memcpy(q, data, len);
2796 ret = create_checksum(context,
2799 INTEGRITY_USAGE(usage),
2803 if(ret == 0 && cksum.checksum.length != checksum_sz) {
2804 free_Checksum (&cksum);
2805 krb5_clear_error_string (context);
2806 ret = KRB5_CRYPTO_INTERNAL;
2810 memcpy(p + block_sz, cksum.checksum.data, cksum.checksum.length);
2811 free_Checksum (&cksum);
2812 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
2815 ret = _key_schedule(context, dkey);
2819 krb5_crypto_debug(context, 1, block_sz, dkey->key);
2821 ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec);
2825 result->length = total_sz;
2828 memset(p, 0, total_sz);
2834 static krb5_error_code
2835 encrypt_internal(krb5_context context,
2842 size_t sz, block_sz, checksum_sz;
2844 unsigned char *p, *q;
2845 krb5_error_code ret;
2846 const struct encryption_type *et = crypto->et;
2848 checksum_sz = CHECKSUMSIZE(et->checksum);
2850 sz = et->confoundersize + checksum_sz + len;
2851 block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
2852 p = calloc(1, block_sz);
2854 krb5_set_error_string(context, "malloc: out of memory");
2859 krb5_generate_random_block(q, et->confoundersize); /* XXX */
2860 q += et->confoundersize;
2861 memset(q, 0, checksum_sz);
2863 memcpy(q, data, len);
2865 ret = create_checksum(context,
2872 if(ret == 0 && cksum.checksum.length != checksum_sz) {
2873 krb5_clear_error_string (context);
2874 free_Checksum(&cksum);
2875 ret = KRB5_CRYPTO_INTERNAL;
2879 memcpy(p + et->confoundersize, cksum.checksum.data, cksum.checksum.length);
2880 free_Checksum(&cksum);
2881 ret = _key_schedule(context, &crypto->key);
2885 krb5_crypto_debug(context, 1, block_sz, crypto->key.key);
2887 ret = (*et->encrypt)(context, &crypto->key, p, block_sz, 1, 0, ivec);
2889 memset(p, 0, block_sz);
2894 result->length = block_sz;
2897 memset(p, 0, block_sz);
2902 static krb5_error_code
2903 encrypt_internal_special(krb5_context context,
2911 struct encryption_type *et = crypto->et;
2912 size_t cksum_sz = CHECKSUMSIZE(et->checksum);
2913 size_t sz = len + cksum_sz + et->confoundersize;
2915 krb5_error_code ret;
2919 krb5_set_error_string(context, "malloc: out of memory");
2923 memset (p, 0, cksum_sz);
2925 krb5_generate_random_block(p, et->confoundersize);
2926 p += et->confoundersize;
2927 memcpy (p, data, len);
2928 ret = (*et->encrypt)(context, &crypto->key, tmp, sz, TRUE, usage, ivec);
2935 result->length = sz;
2939 static krb5_error_code
2940 decrypt_internal_derived(krb5_context context,
2951 krb5_error_code ret;
2952 struct key_data *dkey;
2953 struct encryption_type *et = crypto->et;
2956 checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
2957 if (len < checksum_sz) {
2958 krb5_clear_error_string (context);
2959 return EINVAL; /* XXX - better error code? */
2962 if (((len - checksum_sz) % et->padsize) != 0) {
2963 krb5_clear_error_string(context);
2964 return KRB5_BAD_MSIZE;
2968 if(len != 0 && p == NULL) {
2969 krb5_set_error_string(context, "malloc: out of memory");
2972 memcpy(p, data, len);
2976 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
2981 ret = _key_schedule(context, dkey);
2987 krb5_crypto_debug(context, 0, len, dkey->key);
2989 ret = (*et->encrypt)(context, dkey, p, len, 0, usage, ivec);
2995 cksum.checksum.data = p + len;
2996 cksum.checksum.length = checksum_sz;
2997 cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
2999 ret = verify_checksum(context,
3001 INTEGRITY_USAGE(usage),
3009 l = len - et->confoundersize;
3010 memmove(p, p + et->confoundersize, l);
3011 result->data = realloc(p, l);
3012 if(result->data == NULL) {
3014 krb5_set_error_string(context, "malloc: out of memory");
3021 static krb5_error_code
3022 decrypt_internal(krb5_context context,
3029 krb5_error_code ret;
3032 size_t checksum_sz, l;
3033 struct encryption_type *et = crypto->et;
3035 if ((len % et->padsize) != 0) {
3036 krb5_clear_error_string(context);
3037 return KRB5_BAD_MSIZE;
3040 checksum_sz = CHECKSUMSIZE(et->checksum);
3042 if(len != 0 && p == NULL) {
3043 krb5_set_error_string(context, "malloc: out of memory");
3046 memcpy(p, data, len);
3048 ret = _key_schedule(context, &crypto->key);
3054 krb5_crypto_debug(context, 0, len, crypto->key.key);
3056 ret = (*et->encrypt)(context, &crypto->key, p, len, 0, 0, ivec);
3061 ret = krb5_data_copy(&cksum.checksum, p + et->confoundersize, checksum_sz);
3066 memset(p + et->confoundersize, 0, checksum_sz);
3067 cksum.cksumtype = CHECKSUMTYPE(et->checksum);
3068 ret = verify_checksum(context, NULL, 0, p, len, &cksum);
3069 free_Checksum(&cksum);
3074 l = len - et->confoundersize - checksum_sz;
3075 memmove(p, p + et->confoundersize + checksum_sz, l);
3076 result->data = realloc(p, l);
3077 if(result->data == NULL) {
3079 krb5_set_error_string(context, "malloc: out of memory");
3086 static krb5_error_code
3087 decrypt_internal_special(krb5_context context,
3095 struct encryption_type *et = crypto->et;
3096 size_t cksum_sz = CHECKSUMSIZE(et->checksum);
3097 size_t sz = len - cksum_sz - et->confoundersize;
3099 krb5_error_code ret;
3101 if ((len % et->padsize) != 0) {
3102 krb5_clear_error_string(context);
3103 return KRB5_BAD_MSIZE;
3108 krb5_set_error_string(context, "malloc: out of memory");
3111 memcpy(p, data, len);
3113 ret = (*et->encrypt)(context, &crypto->key, p, len, FALSE, usage, ivec);
3119 memmove (p, p + cksum_sz + et->confoundersize, sz);
3120 result->data = realloc(p, sz);
3121 if(result->data == NULL) {
3123 krb5_set_error_string(context, "malloc: out of memory");
3126 result->length = sz;
3132 krb5_encrypt_ivec(krb5_context context,
3140 if(derived_crypto(context, crypto))
3141 return encrypt_internal_derived(context, crypto, usage,
3142 data, len, result, ivec);
3143 else if (special_crypto(context, crypto))
3144 return encrypt_internal_special (context, crypto, usage,
3145 data, len, result, ivec);
3147 return encrypt_internal(context, crypto, data, len, result, ivec);
3151 krb5_encrypt(krb5_context context,
3158 return krb5_encrypt_ivec(context, crypto, usage, data, len, result, NULL);
3162 krb5_encrypt_EncryptedData(krb5_context context,
3168 EncryptedData *result)
3170 result->etype = CRYPTO_ETYPE(crypto);
3172 ALLOC(result->kvno, 1);
3173 *result->kvno = kvno;
3175 result->kvno = NULL;
3176 return krb5_encrypt(context, crypto, usage, data, len, &result->cipher);
3180 krb5_decrypt_ivec(krb5_context context,
3188 if(derived_crypto(context, crypto))
3189 return decrypt_internal_derived(context, crypto, usage,
3190 data, len, result, ivec);
3191 else if (special_crypto (context, crypto))
3192 return decrypt_internal_special(context, crypto, usage,
3193 data, len, result, ivec);
3195 return decrypt_internal(context, crypto, data, len, result, ivec);
3199 krb5_decrypt(krb5_context context,
3206 return krb5_decrypt_ivec (context, crypto, usage, data, len, result,
3211 krb5_decrypt_EncryptedData(krb5_context context,
3214 const EncryptedData *e,
3217 return krb5_decrypt(context, crypto, usage,
3218 e->cipher.data, e->cipher.length, result);
3221 /************************************************************
3223 ************************************************************/
3226 #include <openssl/rand.h>
3228 /* From openssl/crypto/rand/rand_lcl.h */
3229 #define ENTROPY_NEEDED 20
3231 seed_something(void)
3234 char buf[1024], seedfile[256];
3236 /* If there is a seed file, load it. But such a file cannot be trusted,
3237 so use 0 for the entropy estimate */
3238 if (RAND_file_name(seedfile, sizeof(seedfile))) {
3239 fd = open(seedfile, O_RDONLY);
3241 read(fd, buf, sizeof(buf));
3242 /* Use the full buffer anyway */
3243 RAND_add(buf, sizeof(buf), 0.0);
3249 /* Calling RAND_status() will try to use /dev/urandom if it exists so
3250 we do not have to deal with it. */
3251 if (RAND_status() != 1) {
3252 krb5_context context;
3256 if (!krb5_init_context(&context)) {
3257 p = krb5_config_get_string(context, NULL, "libdefaults",
3258 "egd_socket", NULL);
3260 RAND_egd_bytes(p, ENTROPY_NEEDED);
3261 krb5_free_context(context);
3265 if (RAND_status() == 1) {
3266 /* Update the seed file */
3268 RAND_write_file(seedfile);
3276 krb5_generate_random_block(void *buf, size_t len)
3278 static int rng_initialized = 0;
3280 if (!rng_initialized) {
3281 if (seed_something())
3282 krb5_abortx(NULL, "Fatal: could not seed the random number generator");
3284 rng_initialized = 1;
3286 RAND_bytes(buf, len);
3292 krb5_generate_random_block(void *buf, size_t len)
3294 des_cblock key, out;
3295 static des_cblock counter;
3296 static des_key_schedule schedule;
3298 static int initialized = 0;
3301 des_new_random_key(&key);
3302 des_set_key(&key, schedule);
3303 memset(&key, 0, sizeof(key));
3304 des_new_random_key(&counter);
3307 des_ecb_encrypt(&counter, &out, schedule, DES_ENCRYPT);
3308 for(i = 7; i >=0; i--)
3311 memcpy(buf, out, min(len, sizeof(out)));
3312 len -= min(len, sizeof(out));
3313 buf = (char*)buf + sizeof(out);
3319 DES3_postproc(krb5_context context,
3320 unsigned char *k, size_t len, struct key_data *key)
3322 unsigned char x[24];
3325 memset(x, 0, sizeof(x));
3326 for (i = 0; i < 3; ++i) {
3329 for (j = 0; j < 7; ++j) {
3330 unsigned char b = k[7 * i + j];
3335 for (j = 6; j >= 0; --j) {
3336 foo |= k[7 * i + j] & 1;
3341 k = key->key->keyvalue.data;
3343 memset(x, 0, sizeof(x));
3344 if (key->schedule) {
3345 krb5_free_data(context, key->schedule);
3346 key->schedule = NULL;
3348 des_set_odd_parity((des_cblock*)k);
3349 des_set_odd_parity((des_cblock*)(k + 8));
3350 des_set_odd_parity((des_cblock*)(k + 16));
3353 static krb5_error_code
3354 derive_key(krb5_context context,
3355 struct encryption_type *et,
3356 struct key_data *key,
3357 const void *constant,
3361 unsigned int nblocks = 0, i;
3362 krb5_error_code ret = 0;
3364 struct key_type *kt = et->keytype;
3365 ret = _key_schedule(context, key);
3368 if(et->blocksize * 8 < kt->bits ||
3369 len != et->blocksize) {
3370 nblocks = (kt->bits + et->blocksize * 8 - 1) / (et->blocksize * 8);
3371 k = malloc(nblocks * et->blocksize);
3373 krb5_set_error_string(context, "malloc: out of memory");
3376 _krb5_n_fold(constant, len, k, et->blocksize);
3377 for(i = 0; i < nblocks; i++) {
3379 memcpy(k + i * et->blocksize,
3380 k + (i - 1) * et->blocksize,
3382 (*et->encrypt)(context, key, k + i * et->blocksize, et->blocksize,
3386 /* this case is probably broken, but won't be run anyway */
3387 void *c = malloc(len);
3388 size_t res_len = (kt->bits + 7) / 8;
3390 if(len != 0 && c == NULL) {
3391 krb5_set_error_string(context, "malloc: out of memory");
3394 memcpy(c, constant, len);
3395 (*et->encrypt)(context, key, c, len, 1, 0, NULL);
3396 k = malloc(res_len);
3397 if(res_len != 0 && k == NULL) {
3399 krb5_set_error_string(context, "malloc: out of memory");
3402 _krb5_n_fold(c, len, k, res_len);
3406 /* XXX keytype dependent post-processing */
3409 DES3_postproc(context, k, nblocks * et->blocksize, key);
3412 case KEYTYPE_AES128:
3413 case KEYTYPE_AES256:
3414 memcpy(key->key->keyvalue.data, k, key->key->keyvalue.length);
3416 #endif /* ENABLE_AES */
3418 krb5_set_error_string(context,
3419 "derive_key() called with unknown keytype (%u)",
3421 ret = KRB5_CRYPTO_INTERNAL;
3424 memset(k, 0, nblocks * et->blocksize);
3429 static struct key_data *
3430 _new_derived_key(krb5_crypto crypto, unsigned usage)
3432 struct key_usage *d = crypto->key_usage;
3433 d = realloc(d, (crypto->num_key_usage + 1) * sizeof(*d));
3436 crypto->key_usage = d;
3437 d += crypto->num_key_usage++;
3438 memset(d, 0, sizeof(*d));
3444 krb5_derive_key(krb5_context context,
3445 const krb5_keyblock *key,
3447 const void *constant,
3448 size_t constant_len,
3449 krb5_keyblock **derived_key)
3451 krb5_error_code ret;
3452 struct encryption_type *et;
3455 et = _find_enctype (etype);
3457 krb5_set_error_string(context, "encryption type %d not supported",
3459 return KRB5_PROG_ETYPE_NOSUPP;
3462 ret = krb5_copy_keyblock(context, key, derived_key);
3466 d.key = *derived_key;
3468 ret = derive_key(context, et, &d, constant, constant_len);
3471 ret = krb5_copy_keyblock(context, d.key, derived_key);
3475 static krb5_error_code
3476 _get_derived_key(krb5_context context,
3479 struct key_data **key)
3483 unsigned char constant[5];
3485 for(i = 0; i < crypto->num_key_usage; i++)
3486 if(crypto->key_usage[i].usage == usage) {
3487 *key = &crypto->key_usage[i].key;
3490 d = _new_derived_key(crypto, usage);
3492 krb5_set_error_string(context, "malloc: out of memory");
3495 krb5_copy_keyblock(context, crypto->key.key, &d->key);
3496 _krb5_put_int(constant, usage, 5);
3497 derive_key(context, crypto->et, d, constant, sizeof(constant));
3504 krb5_crypto_init(krb5_context context,
3505 const krb5_keyblock *key,
3507 krb5_crypto *crypto)
3509 krb5_error_code ret;
3511 if(*crypto == NULL) {
3512 krb5_set_error_string(context, "malloc: out of memory");
3515 if(etype == ETYPE_NULL)
3516 etype = key->keytype;
3517 (*crypto)->et = _find_enctype(etype);
3518 if((*crypto)->et == NULL) {
3520 krb5_set_error_string (context, "encryption type %d not supported",
3522 return KRB5_PROG_ETYPE_NOSUPP;
3524 if((*crypto)->et->keytype->size != key->keyvalue.length) {
3526 krb5_set_error_string (context, "encryption key has bad length");
3527 return KRB5_BAD_KEYSIZE;
3529 ret = krb5_copy_keyblock(context, key, &(*crypto)->key.key);
3534 (*crypto)->key.schedule = NULL;
3535 (*crypto)->num_key_usage = 0;
3536 (*crypto)->key_usage = NULL;
3541 free_key_data(krb5_context context, struct key_data *key)
3543 krb5_free_keyblock(context, key->key);
3545 memset(key->schedule->data, 0, key->schedule->length);
3546 krb5_free_data(context, key->schedule);
3551 free_key_usage(krb5_context context, struct key_usage *ku)
3553 free_key_data(context, &ku->key);
3557 krb5_crypto_destroy(krb5_context context,
3562 for(i = 0; i < crypto->num_key_usage; i++)
3563 free_key_usage(context, &crypto->key_usage[i]);
3564 free(crypto->key_usage);
3565 free_key_data(context, &crypto->key);
3571 krb5_crypto_getblocksize(krb5_context context,
3575 *blocksize = crypto->et->blocksize;
3580 krb5_string_to_key_derived(krb5_context context,
3586 struct encryption_type *et = _find_enctype(etype);
3587 krb5_error_code ret;
3589 size_t keylen = et->keytype->bits / 8;
3593 krb5_set_error_string (context, "encryption type %d not supported",
3595 return KRB5_PROG_ETYPE_NOSUPP;
3598 if(kd.key == NULL) {
3599 krb5_set_error_string (context, "malloc: out of memory");
3602 ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
3607 kd.key->keytype = etype;
3608 tmp = malloc (keylen);
3610 krb5_free_keyblock(context, kd.key);
3611 krb5_set_error_string (context, "malloc: out of memory");
3614 _krb5_n_fold(str, len, tmp, keylen);
3616 DES3_postproc (context, tmp, keylen, &kd); /* XXX */
3617 memset(tmp, 0, keylen);
3619 ret = derive_key(context,
3622 "kerberos", /* XXX well known constant */
3623 strlen("kerberos"));
3624 ret = krb5_copy_keyblock_contents(context, kd.key, key);
3625 free_key_data(context, &kd);
3630 wrapped_length (krb5_context context,
3634 struct encryption_type *et = crypto->et;
3635 size_t padsize = et->padsize;
3638 res = et->confoundersize + et->checksum->checksumsize + data_len;
3639 res = (res + padsize - 1) / padsize * padsize;
3644 wrapped_length_dervied (krb5_context context,
3648 struct encryption_type *et = crypto->et;
3649 size_t padsize = et->padsize;
3652 res = et->confoundersize + data_len;
3653 res = (res + padsize - 1) / padsize * padsize;
3654 res += et->checksum->checksumsize;
3659 * Return the size of an encrypted packet of length `data_len'
3663 krb5_get_wrapped_length (krb5_context context,
3667 if (derived_crypto (context, crypto))
3668 return wrapped_length_dervied (context, crypto, data_len);
3670 return wrapped_length (context, crypto, data_len);
3675 static krb5_error_code
3676 krb5_get_keyid(krb5_context context,
3681 unsigned char tmp[16];
3684 MD5_Update (&md5, key->keyvalue.data, key->keyvalue.length);
3685 MD5_Final (tmp, &md5);
3686 *keyid = (tmp[12] << 24) | (tmp[13] << 16) | (tmp[14] << 8) | tmp[15];
3691 krb5_crypto_debug(krb5_context context,
3698 krb5_get_keyid(context, key, &keyid);
3699 krb5_enctype_to_string(context, key->keytype, &kt);
3700 krb5_warnx(context, "%s %lu bytes with key-id %#x (%s)",
3701 encrypt ? "encrypting" : "decrypting",
3708 #endif /* CRYPTO_DEBUG */
3716 krb5_context context;
3721 unsigned usage = ENCRYPTION_USAGE(3);
3722 krb5_error_code ret;
3724 ret = krb5_init_context(&context);
3726 errx (1, "krb5_init_context failed: %d", ret);
3728 key.keytype = ETYPE_NEW_DES3_CBC_SHA1;
3729 key.keyvalue.data = "\xb3\x85\x58\x94\xd9\xdc\x7c\xc8"
3730 "\x25\xe9\x85\xab\x3e\xb5\xfb\x0e"
3731 "\xc8\xdf\xab\x26\x86\x64\x15\x25";
3732 key.keyvalue.length = 24;
3734 krb5_crypto_init(context, &key, 0, &crypto);
3736 d = _new_derived_key(crypto, usage);
3739 krb5_copy_keyblock(context, crypto->key.key, &d->key);
3740 _krb5_put_int(constant, usage, 4);
3741 derive_key(context, crypto->et, d, constant, sizeof(constant));
3745 krb5_context context;
3749 krb5_error_code ret;
3752 char *data = "what do ya want for nothing?";
3754 ret = krb5_init_context(&context);
3756 errx (1, "krb5_init_context failed: %d", ret);
3758 key.keytype = ETYPE_NEW_DES3_CBC_SHA1;
3759 key.keyvalue.data = "Jefe";
3760 /* "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"
3761 "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"; */
3762 key.keyvalue.length = 4;
3764 d = calloc(1, sizeof(*d));
3767 res.checksum.length = 20;
3768 res.checksum.data = malloc(res.checksum.length);
3769 SP_HMAC_SHA1_checksum(context, d, data, 28, &res);