2 * Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "krb5_locl.h"
35 RCSID("$Id: crypto.c,v 1.138 2006/05/08 13:47:24 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;
61 #define kcrypto_oid_enc(n) { sizeof(n)/sizeof(n[0]), n }
63 #define CRYPTO_ETYPE(C) ((C)->et->type)
65 /* bits for `flags' below */
66 #define F_KEYED 1 /* checksum is keyed */
67 #define F_CPROOF 2 /* checksum is collision proof */
68 #define F_DERIVED 4 /* uses derived keys */
69 #define F_VARIANT 8 /* uses `variant' keys (6.4.3) */
70 #define F_PSEUDO 16 /* not a real protocol type */
71 #define F_SPECIAL 32 /* backwards */
72 #define F_DISABLED 64 /* enctype/checksum disabled */
77 krb5_error_code (*string_to_key)(krb5_context, krb5_enctype, krb5_data,
78 krb5_salt, krb5_data, krb5_keyblock*);
82 krb5_keytype type; /* XXX */
89 krb5_enctype best_etype;
91 void (*random_key)(krb5_context, krb5_keyblock*);
92 void (*schedule)(krb5_context, struct key_data *, const void *);
93 struct salt_type *string_to_key;
94 void (*random_to_key)(krb5_context, krb5_keyblock*, const void*, size_t);
95 krb5_error_code (*get_params)(krb5_context, const krb5_data *,
96 void **, krb5_data *);
97 krb5_error_code (*set_params)(krb5_context, const void *,
98 const krb5_data *, krb5_data *);
101 struct checksum_type {
107 void (*checksum)(krb5_context context,
108 struct key_data *key,
109 const void *buf, size_t len,
112 krb5_error_code (*verify)(krb5_context context,
113 struct key_data *key,
114 const void *buf, size_t len,
119 struct encryption_type {
125 size_t confoundersize;
126 struct key_type *keytype;
127 struct checksum_type *checksum;
128 struct checksum_type *keyed_checksum;
130 krb5_error_code (*encrypt)(krb5_context context,
131 struct key_data *key,
132 void *data, size_t len,
133 krb5_boolean encryptp,
138 #define ENCRYPTION_USAGE(U) (((U) << 8) | 0xAA)
139 #define INTEGRITY_USAGE(U) (((U) << 8) | 0x55)
140 #define CHECKSUM_USAGE(U) (((U) << 8) | 0x99)
142 static struct checksum_type *_find_checksum(krb5_cksumtype type);
143 static struct encryption_type *_find_enctype(krb5_enctype type);
144 static struct key_type *_find_keytype(krb5_keytype type);
145 static krb5_error_code _get_derived_key(krb5_context, krb5_crypto,
146 unsigned, struct key_data**);
147 static struct key_data *_new_derived_key(krb5_crypto crypto, unsigned usage);
148 static krb5_error_code derive_key(krb5_context context,
149 struct encryption_type *et,
150 struct key_data *key,
151 const void *constant,
153 static krb5_error_code hmac(krb5_context context,
154 struct checksum_type *cm,
158 struct key_data *keyblock,
160 static void free_key_data(krb5_context context, struct key_data *key);
161 static krb5_error_code usage2arcfour (krb5_context, unsigned *);
162 static void xor (DES_cblock *, const unsigned char *);
164 /************************************************************
166 ************************************************************/
168 static HEIMDAL_MUTEX crypto_mutex = HEIMDAL_MUTEX_INITIALIZER;
172 krb5_DES_random_key(krb5_context context,
175 DES_cblock *k = key->keyvalue.data;
177 krb5_generate_random_block(k, sizeof(DES_cblock));
178 DES_set_odd_parity(k);
179 } while(DES_is_weak_key(k));
183 krb5_DES_schedule(krb5_context context,
184 struct key_data *key,
187 DES_set_key(key->key->keyvalue.data, key->schedule->data);
190 #ifdef ENABLE_AFS_STRING_TO_KEY
192 /* This defines the Andrew string_to_key function. It accepts a password
193 * string as input and converts its via a one-way encryption algorithm to a DES
194 * encryption key. It is compatible with the original Andrew authentication
195 * service password database.
199 * Short passwords, i.e 8 characters or less.
202 krb5_DES_AFS3_CMU_string_to_key (krb5_data pw,
206 char password[8+1]; /* crypt is limited to 8 chars anyway */
209 for(i = 0; i < 8; i++) {
210 char c = ((i < pw.length) ? ((char*)pw.data)[i] : 0) ^
212 tolower(((unsigned char*)cell.data)[i]) : 0);
213 password[i] = c ? c : 'X';
217 memcpy(key, crypt(password, "p1") + 2, sizeof(DES_cblock));
219 /* parity is inserted into the LSB so left shift each byte up one
220 bit. This allows ascii characters with a zero MSB to retain as
221 much significance as possible. */
222 for (i = 0; i < sizeof(DES_cblock); i++)
223 ((unsigned char*)key)[i] <<= 1;
224 DES_set_odd_parity (key);
228 * Long passwords, i.e 9 characters or more.
231 krb5_DES_AFS3_Transarc_string_to_key (krb5_data pw,
235 DES_key_schedule schedule;
241 memcpy(password, pw.data, min(pw.length, sizeof(password)));
242 if(pw.length < sizeof(password)) {
243 int len = min(cell.length, sizeof(password) - pw.length);
246 memcpy(password + pw.length, cell.data, len);
247 for (i = pw.length; i < pw.length + len; ++i)
248 password[i] = tolower((unsigned char)password[i]);
250 passlen = min(sizeof(password), pw.length + cell.length);
251 memcpy(&ivec, "kerberos", 8);
252 memcpy(&temp_key, "kerberos", 8);
253 DES_set_odd_parity (&temp_key);
254 DES_set_key (&temp_key, &schedule);
255 DES_cbc_cksum ((void*)password, &ivec, passlen, &schedule, &ivec);
257 memcpy(&temp_key, &ivec, 8);
258 DES_set_odd_parity (&temp_key);
259 DES_set_key (&temp_key, &schedule);
260 DES_cbc_cksum ((void*)password, key, passlen, &schedule, &ivec);
261 memset(&schedule, 0, sizeof(schedule));
262 memset(&temp_key, 0, sizeof(temp_key));
263 memset(&ivec, 0, sizeof(ivec));
264 memset(password, 0, sizeof(password));
266 DES_set_odd_parity (key);
269 static krb5_error_code
270 DES_AFS3_string_to_key(krb5_context context,
271 krb5_enctype enctype,
278 if(password.length > 8)
279 krb5_DES_AFS3_Transarc_string_to_key(password, salt.saltvalue, &tmp);
281 krb5_DES_AFS3_CMU_string_to_key(password, salt.saltvalue, &tmp);
282 key->keytype = enctype;
283 krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
284 memset(&key, 0, sizeof(key));
287 #endif /* ENABLE_AFS_STRING_TO_KEY */
290 DES_string_to_key_int(unsigned char *data, size_t length, DES_cblock *key)
292 DES_key_schedule schedule;
297 unsigned char swap[] = { 0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
298 0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf };
301 p = (unsigned char*)key;
302 for (i = 0; i < length; i++) {
303 unsigned char tmp = data[i];
307 *--p ^= (swap[tmp & 0xf] << 4) | swap[(tmp & 0xf0) >> 4];
311 DES_set_odd_parity(key);
312 if(DES_is_weak_key(key))
314 DES_set_key(key, &schedule);
315 DES_cbc_cksum((void*)data, key, length, &schedule, key);
316 memset(&schedule, 0, sizeof(schedule));
317 DES_set_odd_parity(key);
318 if(DES_is_weak_key(key))
322 static krb5_error_code
323 krb5_DES_string_to_key(krb5_context context,
324 krb5_enctype enctype,
334 #ifdef ENABLE_AFS_STRING_TO_KEY
335 if (opaque.length == 1) {
337 _krb5_get_int(opaque.data, &v, 1);
339 return DES_AFS3_string_to_key(context, enctype, password,
344 len = password.length + salt.saltvalue.length;
346 if(len > 0 && s == NULL) {
347 krb5_set_error_string(context, "malloc: out of memory");
350 memcpy(s, password.data, password.length);
351 memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
352 DES_string_to_key_int(s, len, &tmp);
353 key->keytype = enctype;
354 krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
355 memset(&tmp, 0, sizeof(tmp));
362 krb5_DES_random_to_key(krb5_context context,
367 DES_cblock *k = key->keyvalue.data;
368 memcpy(k, data, key->keyvalue.length);
369 DES_set_odd_parity(k);
370 if(DES_is_weak_key(k))
371 xor(k, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
379 DES3_random_key(krb5_context context,
382 DES_cblock *k = key->keyvalue.data;
384 krb5_generate_random_block(k, 3 * sizeof(DES_cblock));
385 DES_set_odd_parity(&k[0]);
386 DES_set_odd_parity(&k[1]);
387 DES_set_odd_parity(&k[2]);
388 } while(DES_is_weak_key(&k[0]) ||
389 DES_is_weak_key(&k[1]) ||
390 DES_is_weak_key(&k[2]));
394 DES3_schedule(krb5_context context,
395 struct key_data *key,
398 DES_cblock *k = key->key->keyvalue.data;
399 DES_key_schedule *s = key->schedule->data;
400 DES_set_key(&k[0], &s[0]);
401 DES_set_key(&k[1], &s[1]);
402 DES_set_key(&k[2], &s[2]);
406 * A = A xor B. A & B are 8 bytes.
410 xor (DES_cblock *key, const unsigned char *b)
412 unsigned char *a = (unsigned char*)key;
423 static krb5_error_code
424 DES3_string_to_key(krb5_context context,
425 krb5_enctype enctype,
433 unsigned char tmp[24];
436 len = password.length + salt.saltvalue.length;
438 if(len != 0 && str == NULL) {
439 krb5_set_error_string(context, "malloc: out of memory");
442 memcpy(str, password.data, password.length);
443 memcpy(str + password.length, salt.saltvalue.data, salt.saltvalue.length);
446 DES_key_schedule s[3];
449 _krb5_n_fold(str, len, tmp, 24);
451 for(i = 0; i < 3; i++){
452 memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
453 DES_set_odd_parity(keys + i);
454 if(DES_is_weak_key(keys + i))
455 xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
456 DES_set_key(keys + i, &s[i]);
458 memset(&ivec, 0, sizeof(ivec));
459 DES_ede3_cbc_encrypt(tmp,
461 &s[0], &s[1], &s[2], &ivec, DES_ENCRYPT);
462 memset(s, 0, sizeof(s));
463 memset(&ivec, 0, sizeof(ivec));
464 for(i = 0; i < 3; i++){
465 memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
466 DES_set_odd_parity(keys + i);
467 if(DES_is_weak_key(keys + i))
468 xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
470 memset(tmp, 0, sizeof(tmp));
472 key->keytype = enctype;
473 krb5_data_copy(&key->keyvalue, keys, sizeof(keys));
474 memset(keys, 0, sizeof(keys));
480 static krb5_error_code
481 DES3_string_to_key_derived(krb5_context context,
482 krb5_enctype enctype,
489 size_t len = password.length + salt.saltvalue.length;
493 if(len != 0 && s == NULL) {
494 krb5_set_error_string(context, "malloc: out of memory");
497 memcpy(s, password.data, password.length);
498 memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
499 ret = krb5_string_to_key_derived(context,
510 DES3_random_to_key(krb5_context context,
515 unsigned char *x = key->keyvalue.data;
516 const u_char *q = data;
520 memset(x, 0, sizeof(x));
521 for (i = 0; i < 3; ++i) {
523 for (j = 0; j < 7; ++j) {
524 unsigned char b = q[7 * i + j];
529 for (j = 6; j >= 0; --j) {
530 foo |= q[7 * i + j] & 1;
535 k = key->keyvalue.data;
536 for (i = 0; i < 3; i++) {
537 DES_set_odd_parity(&k[i]);
538 if(DES_is_weak_key(&k[i]))
539 xor(&k[i], (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
548 ARCFOUR_schedule(krb5_context context,
552 RC4_set_key (kd->schedule->data,
553 kd->key->keyvalue.length, kd->key->keyvalue.data);
556 static krb5_error_code
557 ARCFOUR_string_to_key(krb5_context context,
558 krb5_enctype enctype,
569 len = 2 * password.length;
571 if (len != 0 && s == NULL) {
572 krb5_set_error_string(context, "malloc: out of memory");
575 for (p = s, i = 0; i < password.length; ++i) {
576 *p++ = ((char *)password.data)[i];
580 MD4_Update (&m, s, len);
581 key->keytype = enctype;
582 krb5_data_alloc (&key->keyvalue, 16);
583 MD4_Final (key->keyvalue.data, &m);
593 int _krb5_AES_string_to_default_iterator = 4096;
595 static krb5_error_code
596 AES_string_to_key(krb5_context context,
597 krb5_enctype enctype,
605 struct encryption_type *et;
608 if (opaque.length == 0)
609 iter = _krb5_AES_string_to_default_iterator;
610 else if (opaque.length == 4) {
612 _krb5_get_int(opaque.data, &v, 4);
613 iter = ((uint32_t)v);
615 return KRB5_PROG_KEYTYPE_NOSUPP; /* XXX */
617 et = _find_enctype(enctype);
619 return KRB5_PROG_KEYTYPE_NOSUPP;
621 key->keytype = enctype;
622 ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
624 krb5_set_error_string(context, "Failed to allocate pkcs5 key");
627 ret = krb5_copy_keyblock(context, key, &kd.key);
629 krb5_free_keyblock(context, key);
633 ret = PKCS5_PBKDF2_HMAC_SHA1(password.data, password.length,
634 salt.saltvalue.data, salt.saltvalue.length,
636 et->keytype->size, kd.key->keyvalue.data);
639 krb5_set_error_string(context, "Error calculating s2k");
640 return KRB5_PROG_KEYTYPE_NOSUPP;
643 ret = derive_key(context, et, &kd, "kerberos", strlen("kerberos"));
645 ret = krb5_copy_keyblock_contents(context, kd.key, key);
646 free_key_data(context, &kd);
651 struct krb5_aes_schedule {
657 AES_schedule(krb5_context context,
661 struct krb5_aes_schedule *key = kd->schedule->data;
662 int bits = kd->key->keyvalue.length * 8;
664 memset(key, 0, sizeof(*key));
665 AES_set_encrypt_key(kd->key->keyvalue.data, bits, &key->ekey);
666 AES_set_decrypt_key(kd->key->keyvalue.data, bits, &key->dkey);
674 int maximum_effective_key;
677 static krb5_error_code
678 rc2_get_params(krb5_context context,
679 const krb5_data *data,
683 RC2CBCParameter rc2params;
684 struct _RC2_params *p;
688 ret = decode_RC2CBCParameter(data->data, data->length, &rc2params, &size);
690 krb5_set_error_string(context, "Can't decode RC2 parameters");
693 p = malloc(sizeof(*p));
695 free_RC2CBCParameter(&rc2params);
696 krb5_set_error_string(context, "malloc - out of memory");
700 switch(rc2params.rc2ParameterVersion) {
702 p->maximum_effective_key = 40;
705 p->maximum_effective_key = 64;
708 p->maximum_effective_key = 128;
713 ret = copy_octet_string(&rc2params.iv, ivec);
714 free_RC2CBCParameter(&rc2params);
720 static krb5_error_code
721 rc2_set_params(krb5_context context,
723 const krb5_data *ivec,
726 RC2CBCParameter rc2params;
727 const struct _RC2_params *p = params;
728 int maximum_effective_key = 128;
732 memset(&rc2params, 0, sizeof(rc2params));
735 maximum_effective_key = p->maximum_effective_key;
738 switch(maximum_effective_key) {
740 rc2params.rc2ParameterVersion = 160;
743 rc2params.rc2ParameterVersion = 120;
746 rc2params.rc2ParameterVersion = 58;
749 ret = copy_octet_string(ivec, &rc2params.iv);
753 ASN1_MALLOC_ENCODE(RC2CBCParameter, data->data, data->length,
754 &rc2params, &size, ret);
755 if (ret == 0 && size != data->length)
756 krb5_abortx(context, "Internal asn1 encoder failure");
757 free_RC2CBCParameter(&rc2params);
763 rc2_schedule(krb5_context context,
767 const struct _RC2_params *p = params;
768 int maximum_effective_key = 128;
770 maximum_effective_key = p->maximum_effective_key;
771 RC2_set_key (kd->schedule->data,
772 kd->key->keyvalue.length,
773 kd->key->keyvalue.data,
774 maximum_effective_key);
782 static struct salt_type des_salt[] = {
786 krb5_DES_string_to_key
788 #ifdef ENABLE_AFS_STRING_TO_KEY
792 DES_AFS3_string_to_key
798 static struct salt_type des3_salt[] = {
807 static struct salt_type des3_salt_derived[] = {
811 DES3_string_to_key_derived
816 static struct salt_type AES_salt[] = {
825 static struct salt_type arcfour_salt[] = {
829 ARCFOUR_string_to_key
838 static struct key_type keytype_null = {
850 static struct key_type keytype_des = {
856 sizeof(DES_key_schedule),
860 krb5_DES_random_to_key
863 static struct key_type keytype_des3 = {
867 3 * sizeof(DES_cblock),
868 3 * sizeof(DES_cblock),
869 3 * sizeof(DES_key_schedule),
876 static struct key_type keytype_des3_derived = {
880 3 * sizeof(DES_cblock),
881 3 * sizeof(DES_cblock),
882 3 * sizeof(DES_key_schedule),
889 static struct key_type keytype_aes128 = {
895 sizeof(struct krb5_aes_schedule),
901 static struct key_type keytype_aes192 = {
907 sizeof(struct krb5_aes_schedule),
913 static struct key_type keytype_aes256 = {
919 sizeof(struct krb5_aes_schedule),
925 static struct key_type keytype_arcfour = {
937 static struct key_type keytype_rc2 = {
952 static struct key_type *keytypes[] = {
955 &keytype_des3_derived,
964 static int num_keytypes = sizeof(keytypes) / sizeof(keytypes[0]);
966 static struct key_type *
967 _find_keytype(krb5_keytype type)
970 for(i = 0; i < num_keytypes; i++)
971 if(keytypes[i]->type == type)
977 krb5_error_code KRB5_LIB_FUNCTION
978 krb5_salttype_to_string (krb5_context context,
983 struct encryption_type *e;
984 struct salt_type *st;
986 e = _find_enctype (etype);
988 krb5_set_error_string(context, "encryption type %d not supported",
990 return KRB5_PROG_ETYPE_NOSUPP;
992 for (st = e->keytype->string_to_key; st && st->type; st++) {
993 if (st->type == stype) {
994 *string = strdup (st->name);
995 if (*string == NULL) {
996 krb5_set_error_string(context, "malloc: out of memory");
1002 krb5_set_error_string(context, "salttype %d not supported", stype);
1003 return HEIM_ERR_SALTTYPE_NOSUPP;
1006 krb5_error_code KRB5_LIB_FUNCTION
1007 krb5_string_to_salttype (krb5_context context,
1010 krb5_salttype *salttype)
1012 struct encryption_type *e;
1013 struct salt_type *st;
1015 e = _find_enctype (etype);
1017 krb5_set_error_string(context, "encryption type %d not supported",
1019 return KRB5_PROG_ETYPE_NOSUPP;
1021 for (st = e->keytype->string_to_key; st && st->type; st++) {
1022 if (strcasecmp (st->name, string) == 0) {
1023 *salttype = st->type;
1027 krb5_set_error_string(context, "salttype %s not supported", string);
1028 return HEIM_ERR_SALTTYPE_NOSUPP;
1031 krb5_error_code KRB5_LIB_FUNCTION
1032 krb5_get_pw_salt(krb5_context context,
1033 krb5_const_principal principal,
1038 krb5_error_code ret;
1041 salt->salttype = KRB5_PW_SALT;
1042 len = strlen(principal->realm);
1043 for (i = 0; i < principal->name.name_string.len; ++i)
1044 len += strlen(principal->name.name_string.val[i]);
1045 ret = krb5_data_alloc (&salt->saltvalue, len);
1048 p = salt->saltvalue.data;
1049 memcpy (p, principal->realm, strlen(principal->realm));
1050 p += strlen(principal->realm);
1051 for (i = 0; i < principal->name.name_string.len; ++i) {
1053 principal->name.name_string.val[i],
1054 strlen(principal->name.name_string.val[i]));
1055 p += strlen(principal->name.name_string.val[i]);
1060 krb5_error_code KRB5_LIB_FUNCTION
1061 krb5_free_salt(krb5_context context,
1064 krb5_data_free(&salt.saltvalue);
1068 krb5_error_code KRB5_LIB_FUNCTION
1069 krb5_string_to_key_data (krb5_context context,
1070 krb5_enctype enctype,
1072 krb5_principal principal,
1075 krb5_error_code ret;
1078 ret = krb5_get_pw_salt(context, principal, &salt);
1081 ret = krb5_string_to_key_data_salt(context, enctype, password, salt, key);
1082 krb5_free_salt(context, salt);
1086 krb5_error_code KRB5_LIB_FUNCTION
1087 krb5_string_to_key (krb5_context context,
1088 krb5_enctype enctype,
1089 const char *password,
1090 krb5_principal principal,
1094 pw.data = rk_UNCONST(password);
1095 pw.length = strlen(password);
1096 return krb5_string_to_key_data(context, enctype, pw, principal, key);
1099 krb5_error_code KRB5_LIB_FUNCTION
1100 krb5_string_to_key_data_salt (krb5_context context,
1101 krb5_enctype enctype,
1107 krb5_data_zero(&opaque);
1108 return krb5_string_to_key_data_salt_opaque(context, enctype, password,
1113 * Do a string -> key for encryption type `enctype' operation on
1114 * `password' (with salt `salt' and the enctype specific data string
1115 * `opaque'), returning the resulting key in `key'
1118 krb5_error_code KRB5_LIB_FUNCTION
1119 krb5_string_to_key_data_salt_opaque (krb5_context context,
1120 krb5_enctype enctype,
1126 struct encryption_type *et =_find_enctype(enctype);
1127 struct salt_type *st;
1129 krb5_set_error_string(context, "encryption type %d not supported",
1131 return KRB5_PROG_ETYPE_NOSUPP;
1133 for(st = et->keytype->string_to_key; st && st->type; st++)
1134 if(st->type == salt.salttype)
1135 return (*st->string_to_key)(context, enctype, password,
1137 krb5_set_error_string(context, "salt type %d not supported",
1139 return HEIM_ERR_SALTTYPE_NOSUPP;
1143 * Do a string -> key for encryption type `enctype' operation on the
1144 * string `password' (with salt `salt'), returning the resulting key
1148 krb5_error_code KRB5_LIB_FUNCTION
1149 krb5_string_to_key_salt (krb5_context context,
1150 krb5_enctype enctype,
1151 const char *password,
1156 pw.data = rk_UNCONST(password);
1157 pw.length = strlen(password);
1158 return krb5_string_to_key_data_salt(context, enctype, pw, salt, key);
1161 krb5_error_code KRB5_LIB_FUNCTION
1162 krb5_string_to_key_salt_opaque (krb5_context context,
1163 krb5_enctype enctype,
1164 const char *password,
1170 pw.data = rk_UNCONST(password);
1171 pw.length = strlen(password);
1172 return krb5_string_to_key_data_salt_opaque(context, enctype,
1173 pw, salt, opaque, key);
1176 krb5_error_code KRB5_LIB_FUNCTION
1177 krb5_keytype_to_string(krb5_context context,
1178 krb5_keytype keytype,
1181 struct key_type *kt = _find_keytype(keytype);
1183 krb5_set_error_string(context, "key type %d not supported", keytype);
1184 return KRB5_PROG_KEYTYPE_NOSUPP;
1186 *string = strdup(kt->name);
1187 if(*string == NULL) {
1188 krb5_set_error_string(context, "malloc: out of memory");
1194 krb5_error_code KRB5_LIB_FUNCTION
1195 krb5_string_to_keytype(krb5_context context,
1197 krb5_keytype *keytype)
1200 for(i = 0; i < num_keytypes; i++)
1201 if(strcasecmp(keytypes[i]->name, string) == 0){
1202 *keytype = keytypes[i]->type;
1205 krb5_set_error_string(context, "key type %s not supported", string);
1206 return KRB5_PROG_KEYTYPE_NOSUPP;
1209 krb5_error_code KRB5_LIB_FUNCTION
1210 krb5_enctype_keysize(krb5_context context,
1214 struct encryption_type *et = _find_enctype(type);
1216 krb5_set_error_string(context, "encryption type %d not supported",
1218 return KRB5_PROG_ETYPE_NOSUPP;
1220 *keysize = et->keytype->size;
1224 krb5_error_code KRB5_LIB_FUNCTION
1225 krb5_generate_random_keyblock(krb5_context context,
1229 krb5_error_code ret;
1230 struct encryption_type *et = _find_enctype(type);
1232 krb5_set_error_string(context, "encryption type %d not supported",
1234 return KRB5_PROG_ETYPE_NOSUPP;
1236 ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
1239 key->keytype = type;
1240 if(et->keytype->random_key)
1241 (*et->keytype->random_key)(context, key);
1243 krb5_generate_random_block(key->keyvalue.data,
1244 key->keyvalue.length);
1248 static krb5_error_code
1249 _key_schedule(krb5_context context,
1250 struct key_data *key,
1253 krb5_error_code ret;
1254 struct encryption_type *et = _find_enctype(key->key->keytype);
1255 struct key_type *kt = et->keytype;
1257 if(kt->schedule == NULL)
1259 if (key->schedule != NULL)
1261 ALLOC(key->schedule, 1);
1262 if(key->schedule == NULL) {
1263 krb5_set_error_string(context, "malloc: out of memory");
1266 ret = krb5_data_alloc(key->schedule, kt->schedule_size);
1268 free(key->schedule);
1269 key->schedule = NULL;
1272 (*kt->schedule)(context, key, params);
1276 /************************************************************
1278 ************************************************************/
1281 NONE_checksum(krb5_context context,
1282 struct key_data *key,
1291 CRC32_checksum(krb5_context context,
1292 struct key_data *key,
1299 unsigned char *r = C->checksum.data;
1300 _krb5_crc_init_table ();
1301 crc = _krb5_crc_update (data, len, 0);
1303 r[1] = (crc >> 8) & 0xff;
1304 r[2] = (crc >> 16) & 0xff;
1305 r[3] = (crc >> 24) & 0xff;
1309 RSA_MD4_checksum(krb5_context context,
1310 struct key_data *key,
1319 MD4_Update (&m, data, len);
1320 MD4_Final (C->checksum.data, &m);
1324 RSA_MD4_DES_checksum(krb5_context context,
1325 struct key_data *key,
1333 unsigned char *p = cksum->checksum.data;
1335 krb5_generate_random_block(p, 8);
1337 MD4_Update (&md4, p, 8);
1338 MD4_Update (&md4, data, len);
1339 MD4_Final (p + 8, &md4);
1340 memset (&ivec, 0, sizeof(ivec));
1344 key->schedule->data,
1349 static krb5_error_code
1350 RSA_MD4_DES_verify(krb5_context context,
1351 struct key_data *key,
1358 unsigned char tmp[24];
1359 unsigned char res[16];
1361 krb5_error_code ret = 0;
1363 memset(&ivec, 0, sizeof(ivec));
1364 DES_cbc_encrypt(C->checksum.data,
1367 key->schedule->data,
1371 MD4_Update (&md4, tmp, 8); /* confounder */
1372 MD4_Update (&md4, data, len);
1373 MD4_Final (res, &md4);
1374 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1375 krb5_clear_error_string (context);
1376 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1378 memset(tmp, 0, sizeof(tmp));
1379 memset(res, 0, sizeof(res));
1384 RSA_MD5_checksum(krb5_context context,
1385 struct key_data *key,
1394 MD5_Update(&m, data, len);
1395 MD5_Final (C->checksum.data, &m);
1399 RSA_MD5_DES_checksum(krb5_context context,
1400 struct key_data *key,
1408 unsigned char *p = C->checksum.data;
1410 krb5_generate_random_block(p, 8);
1412 MD5_Update (&md5, p, 8);
1413 MD5_Update (&md5, data, len);
1414 MD5_Final (p + 8, &md5);
1415 memset (&ivec, 0, sizeof(ivec));
1419 key->schedule->data,
1424 static krb5_error_code
1425 RSA_MD5_DES_verify(krb5_context context,
1426 struct key_data *key,
1433 unsigned char tmp[24];
1434 unsigned char res[16];
1436 DES_key_schedule *sched = key->schedule->data;
1437 krb5_error_code ret = 0;
1439 memset(&ivec, 0, sizeof(ivec));
1440 DES_cbc_encrypt(C->checksum.data,
1447 MD5_Update (&md5, tmp, 8); /* confounder */
1448 MD5_Update (&md5, data, len);
1449 MD5_Final (res, &md5);
1450 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1451 krb5_clear_error_string (context);
1452 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1454 memset(tmp, 0, sizeof(tmp));
1455 memset(res, 0, sizeof(res));
1460 RSA_MD5_DES3_checksum(krb5_context context,
1461 struct key_data *key,
1469 unsigned char *p = C->checksum.data;
1470 DES_key_schedule *sched = key->schedule->data;
1472 krb5_generate_random_block(p, 8);
1474 MD5_Update (&md5, p, 8);
1475 MD5_Update (&md5, data, len);
1476 MD5_Final (p + 8, &md5);
1477 memset (&ivec, 0, sizeof(ivec));
1478 DES_ede3_cbc_encrypt(p,
1481 &sched[0], &sched[1], &sched[2],
1486 static krb5_error_code
1487 RSA_MD5_DES3_verify(krb5_context context,
1488 struct key_data *key,
1495 unsigned char tmp[24];
1496 unsigned char res[16];
1498 DES_key_schedule *sched = key->schedule->data;
1499 krb5_error_code ret = 0;
1501 memset(&ivec, 0, sizeof(ivec));
1502 DES_ede3_cbc_encrypt(C->checksum.data,
1505 &sched[0], &sched[1], &sched[2],
1509 MD5_Update (&md5, tmp, 8); /* confounder */
1510 MD5_Update (&md5, data, len);
1511 MD5_Final (res, &md5);
1512 if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
1513 krb5_clear_error_string (context);
1514 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1516 memset(tmp, 0, sizeof(tmp));
1517 memset(res, 0, sizeof(res));
1522 SHA1_checksum(krb5_context context,
1523 struct key_data *key,
1532 SHA1_Update(&m, data, len);
1533 SHA1_Final(C->checksum.data, &m);
1536 /* HMAC according to RFC2104 */
1537 static krb5_error_code
1538 hmac(krb5_context context,
1539 struct checksum_type *cm,
1543 struct key_data *keyblock,
1546 unsigned char *ipad, *opad;
1551 ipad = malloc(cm->blocksize + len);
1554 opad = malloc(cm->blocksize + cm->checksumsize);
1559 memset(ipad, 0x36, cm->blocksize);
1560 memset(opad, 0x5c, cm->blocksize);
1562 if(keyblock->key->keyvalue.length > cm->blocksize){
1563 (*cm->checksum)(context,
1565 keyblock->key->keyvalue.data,
1566 keyblock->key->keyvalue.length,
1569 key = result->checksum.data;
1570 key_len = result->checksum.length;
1572 key = keyblock->key->keyvalue.data;
1573 key_len = keyblock->key->keyvalue.length;
1575 for(i = 0; i < key_len; i++){
1579 memcpy(ipad + cm->blocksize, data, len);
1580 (*cm->checksum)(context, keyblock, ipad, cm->blocksize + len,
1582 memcpy(opad + cm->blocksize, result->checksum.data,
1583 result->checksum.length);
1584 (*cm->checksum)(context, keyblock, opad,
1585 cm->blocksize + cm->checksumsize, usage, result);
1586 memset(ipad, 0, cm->blocksize + len);
1588 memset(opad, 0, cm->blocksize + cm->checksumsize);
1594 krb5_error_code KRB5_LIB_FUNCTION
1595 krb5_hmac(krb5_context context,
1596 krb5_cksumtype cktype,
1603 struct checksum_type *c = _find_checksum(cktype);
1605 krb5_error_code ret;
1608 krb5_set_error_string (context, "checksum type %d not supported",
1610 return KRB5_PROG_SUMTYPE_NOSUPP;
1616 ret = hmac(context, c, data, len, usage, &kd, result);
1619 krb5_free_data(context, kd.schedule);
1625 SP_HMAC_SHA1_checksum(krb5_context context,
1626 struct key_data *key,
1632 struct checksum_type *c = _find_checksum(CKSUMTYPE_SHA1);
1635 krb5_error_code ret;
1637 res.checksum.data = sha1_data;
1638 res.checksum.length = sizeof(sha1_data);
1640 ret = hmac(context, c, data, len, usage, key, &res);
1642 krb5_abortx(context, "hmac failed");
1643 memcpy(result->checksum.data, res.checksum.data, result->checksum.length);
1647 * checksum according to section 5. of draft-brezak-win2k-krb-rc4-hmac-03.txt
1651 HMAC_MD5_checksum(krb5_context context,
1652 struct key_data *key,
1659 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
1660 const char signature[] = "signaturekey";
1662 struct key_data ksign;
1665 unsigned char tmp[16];
1666 unsigned char ksign_c_data[16];
1667 krb5_error_code ret;
1669 ksign_c.checksum.length = sizeof(ksign_c_data);
1670 ksign_c.checksum.data = ksign_c_data;
1671 ret = hmac(context, c, signature, sizeof(signature), 0, key, &ksign_c);
1673 krb5_abortx(context, "hmac failed");
1675 kb.keyvalue = ksign_c.checksum;
1677 t[0] = (usage >> 0) & 0xFF;
1678 t[1] = (usage >> 8) & 0xFF;
1679 t[2] = (usage >> 16) & 0xFF;
1680 t[3] = (usage >> 24) & 0xFF;
1681 MD5_Update (&md5, t, 4);
1682 MD5_Update (&md5, data, len);
1683 MD5_Final (tmp, &md5);
1684 ret = hmac(context, c, tmp, sizeof(tmp), 0, &ksign, result);
1686 krb5_abortx(context, "hmac failed");
1690 * same as previous but being used while encrypting.
1694 HMAC_MD5_checksum_enc(krb5_context context,
1695 struct key_data *key,
1701 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
1703 struct key_data ksign;
1706 unsigned char ksign_c_data[16];
1707 krb5_error_code ret;
1709 t[0] = (usage >> 0) & 0xFF;
1710 t[1] = (usage >> 8) & 0xFF;
1711 t[2] = (usage >> 16) & 0xFF;
1712 t[3] = (usage >> 24) & 0xFF;
1714 ksign_c.checksum.length = sizeof(ksign_c_data);
1715 ksign_c.checksum.data = ksign_c_data;
1716 ret = hmac(context, c, t, sizeof(t), 0, key, &ksign_c);
1718 krb5_abortx(context, "hmac failed");
1720 kb.keyvalue = ksign_c.checksum;
1721 ret = hmac(context, c, data, len, 0, &ksign, result);
1723 krb5_abortx(context, "hmac failed");
1726 static struct checksum_type checksum_none = {
1735 static struct checksum_type checksum_crc32 = {
1744 static struct checksum_type checksum_rsa_md4 = {
1753 static struct checksum_type checksum_rsa_md4_des = {
1754 CKSUMTYPE_RSA_MD4_DES,
1758 F_KEYED | F_CPROOF | F_VARIANT,
1759 RSA_MD4_DES_checksum,
1763 static struct checksum_type checksum_des_mac = {
1771 static struct checksum_type checksum_des_mac_k = {
1772 CKSUMTYPE_DES_MAC_K,
1779 static struct checksum_type checksum_rsa_md4_des_k = {
1780 CKSUMTYPE_RSA_MD4_DES_K,
1785 RSA_MD4_DES_K_checksum,
1786 RSA_MD4_DES_K_verify
1789 static struct checksum_type checksum_rsa_md5 = {
1798 static struct checksum_type checksum_rsa_md5_des = {
1799 CKSUMTYPE_RSA_MD5_DES,
1803 F_KEYED | F_CPROOF | F_VARIANT,
1804 RSA_MD5_DES_checksum,
1807 static struct checksum_type checksum_rsa_md5_des3 = {
1808 CKSUMTYPE_RSA_MD5_DES3,
1812 F_KEYED | F_CPROOF | F_VARIANT,
1813 RSA_MD5_DES3_checksum,
1816 static struct checksum_type checksum_sha1 = {
1825 static struct checksum_type checksum_hmac_sha1_des3 = {
1826 CKSUMTYPE_HMAC_SHA1_DES3,
1830 F_KEYED | F_CPROOF | F_DERIVED,
1831 SP_HMAC_SHA1_checksum,
1835 static struct checksum_type checksum_hmac_sha1_aes128 = {
1836 CKSUMTYPE_HMAC_SHA1_96_AES_128,
1837 "hmac-sha1-96-aes128",
1840 F_KEYED | F_CPROOF | F_DERIVED,
1841 SP_HMAC_SHA1_checksum,
1845 static struct checksum_type checksum_hmac_sha1_aes256 = {
1846 CKSUMTYPE_HMAC_SHA1_96_AES_256,
1847 "hmac-sha1-96-aes256",
1850 F_KEYED | F_CPROOF | F_DERIVED,
1851 SP_HMAC_SHA1_checksum,
1855 static struct checksum_type checksum_hmac_md5 = {
1865 static struct checksum_type checksum_hmac_md5_enc = {
1866 CKSUMTYPE_HMAC_MD5_ENC,
1870 F_KEYED | F_CPROOF | F_PSEUDO,
1871 HMAC_MD5_checksum_enc,
1875 static struct checksum_type *checksum_types[] = {
1879 &checksum_rsa_md4_des,
1882 &checksum_des_mac_k,
1883 &checksum_rsa_md4_des_k,
1886 &checksum_rsa_md5_des,
1887 &checksum_rsa_md5_des3,
1889 &checksum_hmac_sha1_des3,
1890 &checksum_hmac_sha1_aes128,
1891 &checksum_hmac_sha1_aes256,
1893 &checksum_hmac_md5_enc
1896 static int num_checksums = sizeof(checksum_types) / sizeof(checksum_types[0]);
1898 static struct checksum_type *
1899 _find_checksum(krb5_cksumtype type)
1902 for(i = 0; i < num_checksums; i++)
1903 if(checksum_types[i]->type == type)
1904 return checksum_types[i];
1908 static krb5_error_code
1909 get_checksum_key(krb5_context context,
1911 unsigned usage, /* not krb5_key_usage */
1912 struct checksum_type *ct,
1913 struct key_data **key)
1915 krb5_error_code ret = 0;
1917 if(ct->flags & F_DERIVED)
1918 ret = _get_derived_key(context, crypto, usage, key);
1919 else if(ct->flags & F_VARIANT) {
1922 *key = _new_derived_key(crypto, 0xff/* KRB5_KU_RFC1510_VARIANT */);
1924 krb5_set_error_string(context, "malloc: out of memory");
1927 ret = krb5_copy_keyblock(context, crypto->key.key, &(*key)->key);
1930 for(i = 0; i < (*key)->key->keyvalue.length; i++)
1931 ((unsigned char*)(*key)->key->keyvalue.data)[i] ^= 0xF0;
1933 *key = &crypto->key;
1936 ret = _key_schedule(context, *key, crypto->params);
1940 static krb5_error_code
1941 create_checksum (krb5_context context,
1942 struct checksum_type *ct,
1949 krb5_error_code ret;
1950 struct key_data *dkey;
1953 if (ct->flags & F_DISABLED) {
1954 krb5_clear_error_string (context);
1955 return KRB5_PROG_SUMTYPE_NOSUPP;
1957 keyed_checksum = (ct->flags & F_KEYED) != 0;
1958 if(keyed_checksum && crypto == NULL) {
1959 krb5_set_error_string (context, "Checksum type %s is keyed "
1960 "but no crypto context (key) was passed in",
1962 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
1964 if(keyed_checksum) {
1965 ret = get_checksum_key(context, crypto, usage, ct, &dkey);
1970 result->cksumtype = ct->type;
1971 krb5_data_alloc(&result->checksum, ct->checksumsize);
1972 (*ct->checksum)(context, dkey, data, len, usage, result);
1977 arcfour_checksum_p(struct checksum_type *ct, krb5_crypto crypto)
1979 return (ct->type == CKSUMTYPE_HMAC_MD5) &&
1980 (crypto->key.key->keytype == KEYTYPE_ARCFOUR);
1983 krb5_error_code KRB5_LIB_FUNCTION
1984 krb5_create_checksum(krb5_context context,
1986 krb5_key_usage usage,
1992 struct checksum_type *ct = NULL;
1995 /* type 0 -> pick from crypto */
1997 ct = _find_checksum(type);
1998 } else if (crypto) {
1999 ct = crypto->et->keyed_checksum;
2001 ct = crypto->et->checksum;
2005 krb5_set_error_string (context, "checksum type %d not supported",
2007 return KRB5_PROG_SUMTYPE_NOSUPP;
2010 if (arcfour_checksum_p(ct, crypto)) {
2012 usage2arcfour(context, &keyusage);
2014 keyusage = CHECKSUM_USAGE(usage);
2016 return create_checksum(context, ct, crypto, keyusage,
2020 static krb5_error_code
2021 verify_checksum(krb5_context context,
2023 unsigned usage, /* not krb5_key_usage */
2028 krb5_error_code ret;
2029 struct key_data *dkey;
2032 struct checksum_type *ct;
2034 ct = _find_checksum(cksum->cksumtype);
2035 if (ct == NULL || (ct->flags & F_DISABLED)) {
2036 krb5_set_error_string (context, "checksum type %d not supported",
2038 return KRB5_PROG_SUMTYPE_NOSUPP;
2040 if(ct->checksumsize != cksum->checksum.length) {
2041 krb5_clear_error_string (context);
2042 return KRB5KRB_AP_ERR_BAD_INTEGRITY; /* XXX */
2044 keyed_checksum = (ct->flags & F_KEYED) != 0;
2045 if(keyed_checksum && crypto == NULL) {
2046 krb5_set_error_string (context, "Checksum type %s is keyed "
2047 "but no crypto context (key) was passed in",
2049 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
2052 ret = get_checksum_key(context, crypto, usage, ct, &dkey);
2056 return (*ct->verify)(context, dkey, data, len, usage, cksum);
2058 ret = krb5_data_alloc (&c.checksum, ct->checksumsize);
2062 (*ct->checksum)(context, dkey, data, len, usage, &c);
2064 if(c.checksum.length != cksum->checksum.length ||
2065 memcmp(c.checksum.data, cksum->checksum.data, c.checksum.length)) {
2066 krb5_clear_error_string (context);
2067 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2071 krb5_data_free (&c.checksum);
2075 krb5_error_code KRB5_LIB_FUNCTION
2076 krb5_verify_checksum(krb5_context context,
2078 krb5_key_usage usage,
2083 struct checksum_type *ct;
2086 ct = _find_checksum(cksum->cksumtype);
2088 krb5_set_error_string (context, "checksum type %d not supported",
2090 return KRB5_PROG_SUMTYPE_NOSUPP;
2093 if (arcfour_checksum_p(ct, crypto)) {
2095 usage2arcfour(context, &keyusage);
2097 keyusage = CHECKSUM_USAGE(usage);
2099 return verify_checksum(context, crypto, keyusage,
2103 krb5_error_code KRB5_LIB_FUNCTION
2104 krb5_crypto_get_checksum_type(krb5_context context,
2106 krb5_cksumtype *type)
2108 struct checksum_type *ct = NULL;
2110 if (crypto != NULL) {
2111 ct = crypto->et->keyed_checksum;
2113 ct = crypto->et->checksum;
2117 krb5_set_error_string (context, "checksum type not found");
2118 return KRB5_PROG_SUMTYPE_NOSUPP;
2127 krb5_error_code KRB5_LIB_FUNCTION
2128 krb5_checksumsize(krb5_context context,
2129 krb5_cksumtype type,
2132 struct checksum_type *ct = _find_checksum(type);
2134 krb5_set_error_string (context, "checksum type %d not supported",
2136 return KRB5_PROG_SUMTYPE_NOSUPP;
2138 *size = ct->checksumsize;
2142 krb5_boolean KRB5_LIB_FUNCTION
2143 krb5_checksum_is_keyed(krb5_context context,
2144 krb5_cksumtype type)
2146 struct checksum_type *ct = _find_checksum(type);
2149 krb5_set_error_string (context, "checksum type %d not supported",
2151 return KRB5_PROG_SUMTYPE_NOSUPP;
2153 return ct->flags & F_KEYED;
2156 krb5_boolean KRB5_LIB_FUNCTION
2157 krb5_checksum_is_collision_proof(krb5_context context,
2158 krb5_cksumtype type)
2160 struct checksum_type *ct = _find_checksum(type);
2163 krb5_set_error_string (context, "checksum type %d not supported",
2165 return KRB5_PROG_SUMTYPE_NOSUPP;
2167 return ct->flags & F_CPROOF;
2170 krb5_error_code KRB5_LIB_FUNCTION
2171 krb5_checksum_disable(krb5_context context,
2172 krb5_cksumtype type)
2174 struct checksum_type *ct = _find_checksum(type);
2177 krb5_set_error_string (context, "checksum type %d not supported",
2179 return KRB5_PROG_SUMTYPE_NOSUPP;
2181 ct->flags |= F_DISABLED;
2185 /************************************************************
2187 ************************************************************/
2189 static krb5_error_code
2190 NULL_encrypt(krb5_context context,
2191 struct key_data *key,
2194 krb5_boolean encryptp,
2201 static krb5_error_code
2202 DES_CBC_encrypt_null_ivec(krb5_context context,
2203 struct key_data *key,
2206 krb5_boolean encryptp,
2211 DES_key_schedule *s = key->schedule->data;
2212 memset(&ivec, 0, sizeof(ivec));
2213 DES_cbc_encrypt(data, data, len, s, &ivec, encryptp);
2217 static krb5_error_code
2218 DES_CBC_encrypt_key_ivec(krb5_context context,
2219 struct key_data *key,
2222 krb5_boolean encryptp,
2227 DES_key_schedule *s = key->schedule->data;
2228 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
2229 DES_cbc_encrypt(data, data, len, s, &ivec, encryptp);
2233 static krb5_error_code
2234 DES3_CBC_encrypt(krb5_context context,
2235 struct key_data *key,
2238 krb5_boolean encryptp,
2242 DES_cblock local_ivec;
2243 DES_key_schedule *s = key->schedule->data;
2246 memset(local_ivec, 0, sizeof(local_ivec));
2248 DES_ede3_cbc_encrypt(data, data, len, &s[0], &s[1], &s[2], ivec, encryptp);
2252 static krb5_error_code
2253 DES_CFB64_encrypt_null_ivec(krb5_context context,
2254 struct key_data *key,
2257 krb5_boolean encryptp,
2263 DES_key_schedule *s = key->schedule->data;
2264 memset(&ivec, 0, sizeof(ivec));
2266 DES_cfb64_encrypt(data, data, len, s, &ivec, &num, encryptp);
2270 static krb5_error_code
2271 DES_PCBC_encrypt_key_ivec(krb5_context context,
2272 struct key_data *key,
2275 krb5_boolean encryptp,
2280 DES_key_schedule *s = key->schedule->data;
2281 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
2283 DES_pcbc_encrypt(data, data, len, s, &ivec, encryptp);
2288 * AES draft-raeburn-krb-rijndael-krb-02
2291 void KRB5_LIB_FUNCTION
2292 _krb5_aes_cts_encrypt(const unsigned char *in, unsigned char *out,
2293 size_t len, const void *aes_key,
2294 unsigned char *ivec, const int encryptp)
2296 unsigned char tmp[AES_BLOCK_SIZE];
2297 const AES_KEY *key = aes_key; /* XXX remove this when we always have AES */
2301 * In the framework of kerberos, the length can never be shorter
2302 * then at least one blocksize.
2307 while(len > AES_BLOCK_SIZE) {
2308 for (i = 0; i < AES_BLOCK_SIZE; i++)
2309 tmp[i] = in[i] ^ ivec[i];
2310 AES_encrypt(tmp, out, key);
2311 memcpy(ivec, out, AES_BLOCK_SIZE);
2312 len -= AES_BLOCK_SIZE;
2313 in += AES_BLOCK_SIZE;
2314 out += AES_BLOCK_SIZE;
2317 for (i = 0; i < len; i++)
2318 tmp[i] = in[i] ^ ivec[i];
2319 for (; i < AES_BLOCK_SIZE; i++)
2320 tmp[i] = 0 ^ ivec[i];
2322 AES_encrypt(tmp, out - AES_BLOCK_SIZE, key);
2324 memcpy(out, ivec, len);
2325 memcpy(ivec, out - AES_BLOCK_SIZE, AES_BLOCK_SIZE);
2328 unsigned char tmp2[AES_BLOCK_SIZE];
2329 unsigned char tmp3[AES_BLOCK_SIZE];
2331 while(len > AES_BLOCK_SIZE * 2) {
2332 memcpy(tmp, in, AES_BLOCK_SIZE);
2333 AES_decrypt(in, out, key);
2334 for (i = 0; i < AES_BLOCK_SIZE; i++)
2336 memcpy(ivec, tmp, AES_BLOCK_SIZE);
2337 len -= AES_BLOCK_SIZE;
2338 in += AES_BLOCK_SIZE;
2339 out += AES_BLOCK_SIZE;
2342 len -= AES_BLOCK_SIZE;
2344 memcpy(tmp, in, AES_BLOCK_SIZE); /* save last iv */
2345 AES_decrypt(in, tmp2, key);
2347 memcpy(tmp3, in + AES_BLOCK_SIZE, len);
2348 memcpy(tmp3 + len, tmp2 + len, AES_BLOCK_SIZE - len); /* xor 0 */
2350 for (i = 0; i < len; i++)
2351 out[i + AES_BLOCK_SIZE] = tmp2[i] ^ tmp3[i];
2353 AES_decrypt(tmp3, out, key);
2354 for (i = 0; i < AES_BLOCK_SIZE; i++)
2356 memcpy(ivec, tmp, AES_BLOCK_SIZE);
2360 static krb5_error_code
2361 AES_CTS_encrypt(krb5_context context,
2362 struct key_data *key,
2365 krb5_boolean encryptp,
2369 struct krb5_aes_schedule *aeskey = key->schedule->data;
2370 char local_ivec[AES_BLOCK_SIZE];
2378 if (len < AES_BLOCK_SIZE)
2379 krb5_abortx(context, "invalid use of AES_CTS_encrypt");
2380 if (len == AES_BLOCK_SIZE) {
2382 AES_encrypt(data, data, k);
2384 AES_decrypt(data, data, k);
2387 memset(local_ivec, 0, sizeof(local_ivec));
2390 _krb5_aes_cts_encrypt(data, data, len, k, ivec, encryptp);
2397 * section 6 of draft-brezak-win2k-krb-rc4-hmac-03
2399 * warning: not for small children
2402 static krb5_error_code
2403 ARCFOUR_subencrypt(krb5_context context,
2404 struct key_data *key,
2410 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
2411 Checksum k1_c, k2_c, k3_c, cksum;
2416 unsigned char *cdata = data;
2417 unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
2418 krb5_error_code ret;
2420 t[0] = (usage >> 0) & 0xFF;
2421 t[1] = (usage >> 8) & 0xFF;
2422 t[2] = (usage >> 16) & 0xFF;
2423 t[3] = (usage >> 24) & 0xFF;
2425 k1_c.checksum.length = sizeof(k1_c_data);
2426 k1_c.checksum.data = k1_c_data;
2428 ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
2430 krb5_abortx(context, "hmac failed");
2432 memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
2434 k2_c.checksum.length = sizeof(k2_c_data);
2435 k2_c.checksum.data = k2_c_data;
2438 kb.keyvalue = k2_c.checksum;
2440 cksum.checksum.length = 16;
2441 cksum.checksum.data = data;
2443 ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
2445 krb5_abortx(context, "hmac failed");
2448 kb.keyvalue = k1_c.checksum;
2450 k3_c.checksum.length = sizeof(k3_c_data);
2451 k3_c.checksum.data = k3_c_data;
2453 ret = hmac(NULL, c, data, 16, 0, &ke, &k3_c);
2455 krb5_abortx(context, "hmac failed");
2457 RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data);
2458 RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16);
2459 memset (k1_c_data, 0, sizeof(k1_c_data));
2460 memset (k2_c_data, 0, sizeof(k2_c_data));
2461 memset (k3_c_data, 0, sizeof(k3_c_data));
2465 static krb5_error_code
2466 ARCFOUR_subdecrypt(krb5_context context,
2467 struct key_data *key,
2473 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
2474 Checksum k1_c, k2_c, k3_c, cksum;
2479 unsigned char *cdata = data;
2480 unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
2481 unsigned char cksum_data[16];
2482 krb5_error_code ret;
2484 t[0] = (usage >> 0) & 0xFF;
2485 t[1] = (usage >> 8) & 0xFF;
2486 t[2] = (usage >> 16) & 0xFF;
2487 t[3] = (usage >> 24) & 0xFF;
2489 k1_c.checksum.length = sizeof(k1_c_data);
2490 k1_c.checksum.data = k1_c_data;
2492 ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
2494 krb5_abortx(context, "hmac failed");
2496 memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
2498 k2_c.checksum.length = sizeof(k2_c_data);
2499 k2_c.checksum.data = k2_c_data;
2502 kb.keyvalue = k1_c.checksum;
2504 k3_c.checksum.length = sizeof(k3_c_data);
2505 k3_c.checksum.data = k3_c_data;
2507 ret = hmac(NULL, c, cdata, 16, 0, &ke, &k3_c);
2509 krb5_abortx(context, "hmac failed");
2511 RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data);
2512 RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16);
2515 kb.keyvalue = k2_c.checksum;
2517 cksum.checksum.length = 16;
2518 cksum.checksum.data = cksum_data;
2520 ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
2522 krb5_abortx(context, "hmac failed");
2524 memset (k1_c_data, 0, sizeof(k1_c_data));
2525 memset (k2_c_data, 0, sizeof(k2_c_data));
2526 memset (k3_c_data, 0, sizeof(k3_c_data));
2528 if (memcmp (cksum.checksum.data, data, 16) != 0) {
2529 krb5_clear_error_string (context);
2530 return KRB5KRB_AP_ERR_BAD_INTEGRITY;
2537 * convert the usage numbers used in
2538 * draft-ietf-cat-kerb-key-derivation-00.txt to the ones in
2539 * draft-brezak-win2k-krb-rc4-hmac-04.txt
2542 static krb5_error_code
2543 usage2arcfour (krb5_context context, unsigned *usage)
2546 case KRB5_KU_AS_REP_ENC_PART : /* 3 */
2547 case KRB5_KU_TGS_REP_ENC_PART_SUB_KEY : /* 9 */
2550 case KRB5_KU_USAGE_SEAL : /* 22 */
2553 case KRB5_KU_USAGE_SIGN : /* 23 */
2556 case KRB5_KU_USAGE_SEQ: /* 24 */
2564 static krb5_error_code
2565 ARCFOUR_encrypt(krb5_context context,
2566 struct key_data *key,
2569 krb5_boolean encryptp,
2573 krb5_error_code ret;
2574 unsigned keyusage = usage;
2576 if((ret = usage2arcfour (context, &keyusage)) != 0)
2580 return ARCFOUR_subencrypt (context, key, data, len, keyusage, ivec);
2582 return ARCFOUR_subdecrypt (context, key, data, len, keyusage, ivec);
2587 * these should currently be in reverse preference order.
2588 * (only relevant for !F_PSEUDO) */
2590 static struct encryption_type enctype_null = {
2603 static struct encryption_type enctype_des_cbc_crc = {
2614 DES_CBC_encrypt_key_ivec,
2616 static struct encryption_type enctype_des_cbc_md4 = {
2625 &checksum_rsa_md4_des,
2627 DES_CBC_encrypt_null_ivec,
2629 static struct encryption_type enctype_des_cbc_md5 = {
2638 &checksum_rsa_md5_des,
2640 DES_CBC_encrypt_null_ivec,
2642 static struct encryption_type enctype_arcfour_hmac_md5 = {
2643 ETYPE_ARCFOUR_HMAC_MD5,
2655 static struct encryption_type enctype_des3_cbc_md5 = {
2664 &checksum_rsa_md5_des3,
2668 static struct encryption_type enctype_des3_cbc_sha1 = {
2669 ETYPE_DES3_CBC_SHA1,
2675 &keytype_des3_derived,
2677 &checksum_hmac_sha1_des3,
2681 static struct encryption_type enctype_old_des3_cbc_sha1 = {
2682 ETYPE_OLD_DES3_CBC_SHA1,
2683 "old-des3-cbc-sha1",
2690 &checksum_hmac_sha1_des3,
2694 static struct encryption_type enctype_aes128_cts_hmac_sha1 = {
2695 ETYPE_AES128_CTS_HMAC_SHA1_96,
2696 "aes128-cts-hmac-sha1-96",
2703 &checksum_hmac_sha1_aes128,
2707 static struct encryption_type enctype_aes256_cts_hmac_sha1 = {
2708 ETYPE_AES256_CTS_HMAC_SHA1_96,
2709 "aes256-cts-hmac-sha1-96",
2716 &checksum_hmac_sha1_aes256,
2720 static struct encryption_type enctype_des_cbc_none = {
2731 DES_CBC_encrypt_null_ivec,
2733 static struct encryption_type enctype_des_cfb64_none = {
2734 ETYPE_DES_CFB64_NONE,
2744 DES_CFB64_encrypt_null_ivec,
2746 static struct encryption_type enctype_des_pcbc_none = {
2747 ETYPE_DES_PCBC_NONE,
2757 DES_PCBC_encrypt_key_ivec,
2759 static struct encryption_type enctype_des3_cbc_none = {
2760 ETYPE_DES3_CBC_NONE,
2766 &keytype_des3_derived,
2773 static struct encryption_type *etypes[] = {
2775 &enctype_des_cbc_crc,
2776 &enctype_des_cbc_md4,
2777 &enctype_des_cbc_md5,
2778 &enctype_arcfour_hmac_md5,
2779 &enctype_des3_cbc_md5,
2780 &enctype_des3_cbc_sha1,
2781 &enctype_old_des3_cbc_sha1,
2782 &enctype_aes128_cts_hmac_sha1,
2783 &enctype_aes256_cts_hmac_sha1,
2784 &enctype_des_cbc_none,
2785 &enctype_des_cfb64_none,
2786 &enctype_des_pcbc_none,
2787 &enctype_des3_cbc_none
2790 static unsigned num_etypes = sizeof(etypes) / sizeof(etypes[0]);
2793 static struct encryption_type *
2794 _find_enctype(krb5_enctype type)
2797 for(i = 0; i < num_etypes; i++)
2798 if(etypes[i]->type == type)
2804 krb5_error_code KRB5_LIB_FUNCTION
2805 krb5_enctype_to_string(krb5_context context,
2809 struct encryption_type *e;
2810 e = _find_enctype(etype);
2812 krb5_set_error_string (context, "encryption type %d not supported",
2814 return KRB5_PROG_ETYPE_NOSUPP;
2816 *string = strdup(e->name);
2817 if(*string == NULL) {
2818 krb5_set_error_string(context, "malloc: out of memory");
2824 krb5_error_code KRB5_LIB_FUNCTION
2825 krb5_string_to_enctype(krb5_context context,
2827 krb5_enctype *etype)
2830 for(i = 0; i < num_etypes; i++)
2831 if(strcasecmp(etypes[i]->name, string) == 0){
2832 *etype = etypes[i]->type;
2835 krb5_set_error_string (context, "encryption type %s not supported",
2837 return KRB5_PROG_ETYPE_NOSUPP;
2840 krb5_error_code KRB5_LIB_FUNCTION
2841 krb5_enctype_to_oid(krb5_context context,
2845 struct encryption_type *et = _find_enctype(etype);
2847 krb5_set_error_string (context, "encryption type %d not supported",
2849 return KRB5_PROG_ETYPE_NOSUPP;
2851 if(et->oid == NULL) {
2852 krb5_set_error_string (context, "%s have not oid", et->name);
2853 return KRB5_PROG_ETYPE_NOSUPP;
2855 krb5_clear_error_string(context);
2856 return copy_oid(et->oid, oid);
2859 krb5_error_code KRB5_LIB_FUNCTION
2860 _krb5_oid_to_enctype(krb5_context context,
2861 const heim_oid *oid,
2862 krb5_enctype *etype)
2865 for(i = 0; i < num_etypes; i++) {
2866 if(etypes[i]->oid && heim_oid_cmp(etypes[i]->oid, oid) == 0) {
2867 *etype = etypes[i]->type;
2871 krb5_set_error_string(context, "enctype for oid not supported");
2872 return KRB5_PROG_ETYPE_NOSUPP;
2875 krb5_error_code KRB5_LIB_FUNCTION
2876 krb5_enctype_to_keytype(krb5_context context,
2878 krb5_keytype *keytype)
2880 struct encryption_type *e = _find_enctype(etype);
2882 krb5_set_error_string (context, "encryption type %d not supported",
2884 return KRB5_PROG_ETYPE_NOSUPP;
2886 *keytype = e->keytype->type; /* XXX */
2891 krb5_error_code KRB5_LIB_FUNCTION
2892 krb5_keytype_to_enctype(krb5_context context,
2893 krb5_keytype keytype,
2894 krb5_enctype *etype)
2896 struct key_type *kt = _find_keytype(keytype);
2897 krb5_warnx(context, "krb5_keytype_to_enctype(%u)", keytype);
2899 return KRB5_PROG_KEYTYPE_NOSUPP;
2900 *etype = kt->best_etype;
2905 krb5_error_code KRB5_LIB_FUNCTION
2906 krb5_keytype_to_enctypes (krb5_context context,
2907 krb5_keytype keytype,
2915 for (i = num_etypes - 1; i >= 0; --i) {
2916 if (etypes[i]->keytype->type == keytype
2917 && !(etypes[i]->flags & F_PSEUDO))
2920 ret = malloc(n * sizeof(*ret));
2921 if (ret == NULL && n != 0) {
2922 krb5_set_error_string(context, "malloc: out of memory");
2926 for (i = num_etypes - 1; i >= 0; --i) {
2927 if (etypes[i]->keytype->type == keytype
2928 && !(etypes[i]->flags & F_PSEUDO))
2929 ret[n++] = etypes[i]->type;
2937 * First take the configured list of etypes for `keytype' if available,
2938 * else, do `krb5_keytype_to_enctypes'.
2941 krb5_error_code KRB5_LIB_FUNCTION
2942 krb5_keytype_to_enctypes_default (krb5_context context,
2943 krb5_keytype keytype,
2950 if (keytype != KEYTYPE_DES || context->etypes_des == NULL)
2951 return krb5_keytype_to_enctypes (context, keytype, len, val);
2953 for (n = 0; context->etypes_des[n]; ++n)
2955 ret = malloc (n * sizeof(*ret));
2956 if (ret == NULL && n != 0) {
2957 krb5_set_error_string(context, "malloc: out of memory");
2960 for (i = 0; i < n; ++i)
2961 ret[i] = context->etypes_des[i];
2967 krb5_error_code KRB5_LIB_FUNCTION
2968 krb5_enctype_valid(krb5_context context,
2971 struct encryption_type *e = _find_enctype(etype);
2973 krb5_set_error_string (context, "encryption type %d not supported",
2975 return KRB5_PROG_ETYPE_NOSUPP;
2977 if (e->flags & F_DISABLED) {
2978 krb5_set_error_string (context, "encryption type %s is disabled",
2980 return KRB5_PROG_ETYPE_NOSUPP;
2985 krb5_error_code KRB5_LIB_FUNCTION
2986 krb5_cksumtype_valid(krb5_context context,
2987 krb5_cksumtype ctype)
2989 struct checksum_type *c = _find_checksum(ctype);
2991 krb5_set_error_string (context, "checksum type %d not supported",
2993 return KRB5_PROG_SUMTYPE_NOSUPP;
2995 if (c->flags & F_DISABLED) {
2996 krb5_set_error_string (context, "checksum type %s is disabled",
2998 return KRB5_PROG_SUMTYPE_NOSUPP;
3004 /* if two enctypes have compatible keys */
3005 krb5_boolean KRB5_LIB_FUNCTION
3006 krb5_enctypes_compatible_keys(krb5_context context,
3007 krb5_enctype etype1,
3008 krb5_enctype etype2)
3010 struct encryption_type *e1 = _find_enctype(etype1);
3011 struct encryption_type *e2 = _find_enctype(etype2);
3012 return e1 != NULL && e2 != NULL && e1->keytype == e2->keytype;
3016 derived_crypto(krb5_context context,
3019 return (crypto->et->flags & F_DERIVED) != 0;
3023 special_crypto(krb5_context context,
3026 return (crypto->et->flags & F_SPECIAL) != 0;
3029 #define CHECKSUMSIZE(C) ((C)->checksumsize)
3030 #define CHECKSUMTYPE(C) ((C)->type)
3032 static krb5_error_code
3033 encrypt_internal_derived(krb5_context context,
3041 size_t sz, block_sz, checksum_sz, total_sz;
3043 unsigned char *p, *q;
3044 krb5_error_code ret;
3045 struct key_data *dkey;
3046 const struct encryption_type *et = crypto->et;
3048 checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
3050 sz = et->confoundersize + len;
3051 block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
3052 total_sz = block_sz + checksum_sz;
3053 p = calloc(1, total_sz);
3055 krb5_set_error_string(context, "malloc: out of memory");
3060 krb5_generate_random_block(q, et->confoundersize); /* XXX */
3061 q += et->confoundersize;
3062 memcpy(q, data, len);
3064 ret = create_checksum(context,
3067 INTEGRITY_USAGE(usage),
3071 if(ret == 0 && cksum.checksum.length != checksum_sz) {
3072 free_Checksum (&cksum);
3073 krb5_clear_error_string (context);
3074 ret = KRB5_CRYPTO_INTERNAL;
3078 memcpy(p + block_sz, cksum.checksum.data, cksum.checksum.length);
3079 free_Checksum (&cksum);
3080 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
3083 ret = _key_schedule(context, dkey, crypto->params);
3087 krb5_crypto_debug(context, 1, block_sz, dkey->key);
3089 ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec);
3093 result->length = total_sz;
3096 memset(p, 0, total_sz);
3102 static krb5_error_code
3103 encrypt_internal(krb5_context context,
3110 size_t sz, block_sz, checksum_sz;
3112 unsigned char *p, *q;
3113 krb5_error_code ret;
3114 const struct encryption_type *et = crypto->et;
3116 checksum_sz = CHECKSUMSIZE(et->checksum);
3118 sz = et->confoundersize + checksum_sz + len;
3119 block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
3120 p = calloc(1, block_sz);
3122 krb5_set_error_string(context, "malloc: out of memory");
3127 krb5_generate_random_block(q, et->confoundersize); /* XXX */
3128 q += et->confoundersize;
3129 memset(q, 0, checksum_sz);
3131 memcpy(q, data, len);
3133 ret = create_checksum(context,
3140 if(ret == 0 && cksum.checksum.length != checksum_sz) {
3141 krb5_clear_error_string (context);
3142 free_Checksum(&cksum);
3143 ret = KRB5_CRYPTO_INTERNAL;
3147 memcpy(p + et->confoundersize, cksum.checksum.data, cksum.checksum.length);
3148 free_Checksum(&cksum);
3149 ret = _key_schedule(context, &crypto->key, crypto->params);
3153 krb5_crypto_debug(context, 1, block_sz, crypto->key.key);
3155 ret = (*et->encrypt)(context, &crypto->key, p, block_sz, 1, 0, ivec);
3157 memset(p, 0, block_sz);
3162 result->length = block_sz;
3165 memset(p, 0, block_sz);
3170 static krb5_error_code
3171 encrypt_internal_special(krb5_context context,
3179 struct encryption_type *et = crypto->et;
3180 size_t cksum_sz = CHECKSUMSIZE(et->checksum);
3181 size_t sz = len + cksum_sz + et->confoundersize;
3183 krb5_error_code ret;
3187 krb5_set_error_string(context, "malloc: out of memory");
3191 memset (p, 0, cksum_sz);
3193 krb5_generate_random_block(p, et->confoundersize);
3194 p += et->confoundersize;
3195 memcpy (p, data, len);
3196 ret = (*et->encrypt)(context, &crypto->key, tmp, sz, TRUE, usage, ivec);
3203 result->length = sz;
3207 static krb5_error_code
3208 decrypt_internal_derived(krb5_context context,
3219 krb5_error_code ret;
3220 struct key_data *dkey;
3221 struct encryption_type *et = crypto->et;
3224 checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
3225 if (len < checksum_sz) {
3226 krb5_clear_error_string (context);
3227 return EINVAL; /* XXX - better error code? */
3230 if (((len - checksum_sz) % et->padsize) != 0) {
3231 krb5_clear_error_string(context);
3232 return KRB5_BAD_MSIZE;
3236 if(len != 0 && p == NULL) {
3237 krb5_set_error_string(context, "malloc: out of memory");
3240 memcpy(p, data, len);
3244 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
3249 ret = _key_schedule(context, dkey, crypto->params);
3255 krb5_crypto_debug(context, 0, len, dkey->key);
3257 ret = (*et->encrypt)(context, dkey, p, len, 0, usage, ivec);
3263 cksum.checksum.data = p + len;
3264 cksum.checksum.length = checksum_sz;
3265 cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
3267 ret = verify_checksum(context,
3269 INTEGRITY_USAGE(usage),
3277 l = len - et->confoundersize;
3278 memmove(p, p + et->confoundersize, l);
3279 result->data = realloc(p, l);
3280 if(result->data == NULL && l != 0) {
3282 krb5_set_error_string(context, "malloc: out of memory");
3289 static krb5_error_code
3290 decrypt_internal(krb5_context context,
3297 krb5_error_code ret;
3300 size_t checksum_sz, l;
3301 struct encryption_type *et = crypto->et;
3303 if ((len % et->padsize) != 0) {
3304 krb5_clear_error_string(context);
3305 return KRB5_BAD_MSIZE;
3308 checksum_sz = CHECKSUMSIZE(et->checksum);
3310 if(len != 0 && p == NULL) {
3311 krb5_set_error_string(context, "malloc: out of memory");
3314 memcpy(p, data, len);
3316 ret = _key_schedule(context, &crypto->key, crypto->params);
3322 krb5_crypto_debug(context, 0, len, crypto->key.key);
3324 ret = (*et->encrypt)(context, &crypto->key, p, len, 0, 0, ivec);
3329 ret = krb5_data_copy(&cksum.checksum, p + et->confoundersize, checksum_sz);
3334 memset(p + et->confoundersize, 0, checksum_sz);
3335 cksum.cksumtype = CHECKSUMTYPE(et->checksum);
3336 ret = verify_checksum(context, NULL, 0, p, len, &cksum);
3337 free_Checksum(&cksum);
3342 l = len - et->confoundersize - checksum_sz;
3343 memmove(p, p + et->confoundersize + checksum_sz, l);
3344 result->data = realloc(p, l);
3345 if(result->data == NULL && l != 0) {
3347 krb5_set_error_string(context, "malloc: out of memory");
3354 static krb5_error_code
3355 decrypt_internal_special(krb5_context context,
3363 struct encryption_type *et = crypto->et;
3364 size_t cksum_sz = CHECKSUMSIZE(et->checksum);
3365 size_t sz = len - cksum_sz - et->confoundersize;
3367 krb5_error_code ret;
3369 if ((len % et->padsize) != 0) {
3370 krb5_clear_error_string(context);
3371 return KRB5_BAD_MSIZE;
3376 krb5_set_error_string(context, "malloc: out of memory");
3379 memcpy(p, data, len);
3381 ret = (*et->encrypt)(context, &crypto->key, p, len, FALSE, usage, ivec);
3387 memmove (p, p + cksum_sz + et->confoundersize, sz);
3388 result->data = realloc(p, sz);
3389 if(result->data == NULL && sz != 0) {
3391 krb5_set_error_string(context, "malloc: out of memory");
3394 result->length = sz;
3399 krb5_error_code KRB5_LIB_FUNCTION
3400 krb5_encrypt_ivec(krb5_context context,
3408 if(derived_crypto(context, crypto))
3409 return encrypt_internal_derived(context, crypto, usage,
3410 data, len, result, ivec);
3411 else if (special_crypto(context, crypto))
3412 return encrypt_internal_special (context, crypto, usage,
3413 data, len, result, ivec);
3415 return encrypt_internal(context, crypto, data, len, result, ivec);
3418 krb5_error_code KRB5_LIB_FUNCTION
3419 krb5_encrypt(krb5_context context,
3426 return krb5_encrypt_ivec(context, crypto, usage, data, len, result, NULL);
3429 krb5_error_code KRB5_LIB_FUNCTION
3430 krb5_encrypt_EncryptedData(krb5_context context,
3436 EncryptedData *result)
3438 result->etype = CRYPTO_ETYPE(crypto);
3440 ALLOC(result->kvno, 1);
3441 *result->kvno = kvno;
3443 result->kvno = NULL;
3444 return krb5_encrypt(context, crypto, usage, data, len, &result->cipher);
3447 krb5_error_code KRB5_LIB_FUNCTION
3448 krb5_decrypt_ivec(krb5_context context,
3456 if(derived_crypto(context, crypto))
3457 return decrypt_internal_derived(context, crypto, usage,
3458 data, len, result, ivec);
3459 else if (special_crypto (context, crypto))
3460 return decrypt_internal_special(context, crypto, usage,
3461 data, len, result, ivec);
3463 return decrypt_internal(context, crypto, data, len, result, ivec);
3466 krb5_error_code KRB5_LIB_FUNCTION
3467 krb5_decrypt(krb5_context context,
3474 return krb5_decrypt_ivec (context, crypto, usage, data, len, result,
3478 krb5_error_code KRB5_LIB_FUNCTION
3479 krb5_decrypt_EncryptedData(krb5_context context,
3482 const EncryptedData *e,
3485 return krb5_decrypt(context, crypto, usage,
3486 e->cipher.data, e->cipher.length, result);
3489 /************************************************************
3491 ************************************************************/
3494 #include <openssl/rand.h>
3496 /* From openssl/crypto/rand/rand_lcl.h */
3497 #define ENTROPY_NEEDED 20
3499 seed_something(void)
3501 char buf[1024], seedfile[256];
3503 /* If there is a seed file, load it. But such a file cannot be trusted,
3504 so use 0 for the entropy estimate */
3505 if (RAND_file_name(seedfile, sizeof(seedfile))) {
3507 fd = open(seedfile, O_RDONLY);
3510 ret = read(fd, buf, sizeof(buf));
3512 RAND_add(buf, ret, 0.0);
3519 /* Calling RAND_status() will try to use /dev/urandom if it exists so
3520 we do not have to deal with it. */
3521 if (RAND_status() != 1) {
3522 krb5_context context;
3526 if (!krb5_init_context(&context)) {
3527 p = krb5_config_get_string(context, NULL, "libdefaults",
3528 "egd_socket", NULL);
3530 RAND_egd_bytes(p, ENTROPY_NEEDED);
3531 krb5_free_context(context);
3535 if (RAND_status() == 1) {
3536 /* Update the seed file */
3538 RAND_write_file(seedfile);
3545 void KRB5_LIB_FUNCTION
3546 krb5_generate_random_block(void *buf, size_t len)
3548 static int rng_initialized = 0;
3550 HEIMDAL_MUTEX_lock(&crypto_mutex);
3551 if (!rng_initialized) {
3552 if (seed_something())
3553 krb5_abortx(NULL, "Fatal: could not seed the random number generator");
3555 rng_initialized = 1;
3557 HEIMDAL_MUTEX_unlock(&crypto_mutex);
3558 if (RAND_bytes(buf, len) != 1)
3559 krb5_abortx(NULL, "Failed to generate random block");
3564 void KRB5_LIB_FUNCTION
3565 krb5_generate_random_block(void *buf, size_t len)
3567 DES_cblock key, out;
3568 static DES_cblock counter;
3569 static DES_key_schedule schedule;
3571 static int initialized = 0;
3573 HEIMDAL_MUTEX_lock(&crypto_mutex);
3575 DES_new_random_key(&key);
3576 DES_set_key(&key, &schedule);
3577 memset(&key, 0, sizeof(key));
3578 DES_new_random_key(&counter);
3581 HEIMDAL_MUTEX_unlock(&crypto_mutex);
3583 DES_ecb_encrypt(&counter, &out, &schedule, DES_ENCRYPT);
3584 for(i = 7; i >=0; i--)
3587 memcpy(buf, out, min(len, sizeof(out)));
3588 len -= min(len, sizeof(out));
3589 buf = (char*)buf + sizeof(out);
3595 DES3_postproc(krb5_context context,
3596 unsigned char *k, size_t len, struct key_data *key)
3598 DES3_random_to_key(context, key->key, k, len);
3600 if (key->schedule) {
3601 krb5_free_data(context, key->schedule);
3602 key->schedule = NULL;
3606 static krb5_error_code
3607 derive_key(krb5_context context,
3608 struct encryption_type *et,
3609 struct key_data *key,
3610 const void *constant,
3614 unsigned int nblocks = 0, i;
3615 krb5_error_code ret = 0;
3617 struct key_type *kt = et->keytype;
3618 /* since RC2 is only the weird crypto alg with parameter and this
3619 * function not defined with work with RC2, this is ok */
3620 ret = _key_schedule(context, key, NULL);
3623 if(et->blocksize * 8 < kt->bits ||
3624 len != et->blocksize) {
3625 nblocks = (kt->bits + et->blocksize * 8 - 1) / (et->blocksize * 8);
3626 k = malloc(nblocks * et->blocksize);
3628 krb5_set_error_string(context, "malloc: out of memory");
3631 _krb5_n_fold(constant, len, k, et->blocksize);
3632 for(i = 0; i < nblocks; i++) {
3634 memcpy(k + i * et->blocksize,
3635 k + (i - 1) * et->blocksize,
3637 (*et->encrypt)(context, key, k + i * et->blocksize, et->blocksize,
3641 /* this case is probably broken, but won't be run anyway */
3642 void *c = malloc(len);
3643 size_t res_len = (kt->bits + 7) / 8;
3645 if(len != 0 && c == NULL) {
3646 krb5_set_error_string(context, "malloc: out of memory");
3649 memcpy(c, constant, len);
3650 (*et->encrypt)(context, key, c, len, 1, 0, NULL);
3651 k = malloc(res_len);
3652 if(res_len != 0 && k == NULL) {
3654 krb5_set_error_string(context, "malloc: out of memory");
3657 _krb5_n_fold(c, len, k, res_len);
3661 /* XXX keytype dependent post-processing */
3664 DES3_postproc(context, k, nblocks * et->blocksize, key);
3666 case KEYTYPE_AES128:
3667 case KEYTYPE_AES256:
3668 memcpy(key->key->keyvalue.data, k, key->key->keyvalue.length);
3671 krb5_set_error_string(context,
3672 "derive_key() called with unknown keytype (%u)",
3674 ret = KRB5_CRYPTO_INTERNAL;
3677 if (key->schedule) {
3678 krb5_free_data(context, key->schedule);
3679 key->schedule = NULL;
3681 memset(k, 0, nblocks * et->blocksize);
3686 static struct key_data *
3687 _new_derived_key(krb5_crypto crypto, unsigned usage)
3689 struct key_usage *d = crypto->key_usage;
3690 d = realloc(d, (crypto->num_key_usage + 1) * sizeof(*d));
3693 crypto->key_usage = d;
3694 d += crypto->num_key_usage++;
3695 memset(d, 0, sizeof(*d));
3700 krb5_error_code KRB5_LIB_FUNCTION
3701 krb5_derive_key(krb5_context context,
3702 const krb5_keyblock *key,
3704 const void *constant,
3705 size_t constant_len,
3706 krb5_keyblock **derived_key)
3708 krb5_error_code ret;
3709 struct encryption_type *et;
3712 *derived_key = NULL;
3714 et = _find_enctype (etype);
3716 krb5_set_error_string(context, "encryption type %d not supported",
3718 return KRB5_PROG_ETYPE_NOSUPP;
3721 ret = krb5_copy_keyblock(context, key, &d.key);
3726 ret = derive_key(context, et, &d, constant, constant_len);
3728 ret = krb5_copy_keyblock(context, d.key, derived_key);
3729 free_key_data(context, &d);
3733 static krb5_error_code
3734 _get_derived_key(krb5_context context,
3737 struct key_data **key)
3741 unsigned char constant[5];
3743 for(i = 0; i < crypto->num_key_usage; i++)
3744 if(crypto->key_usage[i].usage == usage) {
3745 *key = &crypto->key_usage[i].key;
3748 d = _new_derived_key(crypto, usage);
3750 krb5_set_error_string(context, "malloc: out of memory");
3753 krb5_copy_keyblock(context, crypto->key.key, &d->key);
3754 _krb5_put_int(constant, usage, 5);
3755 derive_key(context, crypto->et, d, constant, sizeof(constant));
3761 krb5_error_code KRB5_LIB_FUNCTION
3762 krb5_crypto_init(krb5_context context,
3763 const krb5_keyblock *key,
3765 krb5_crypto *crypto)
3767 krb5_error_code ret;
3769 if(*crypto == NULL) {
3770 krb5_set_error_string(context, "malloc: out of memory");
3773 if(etype == ETYPE_NULL)
3774 etype = key->keytype;
3775 (*crypto)->et = _find_enctype(etype);
3776 if((*crypto)->et == NULL || ((*crypto)->et->flags & F_DISABLED)) {
3779 krb5_set_error_string (context, "encryption type %d not supported",
3781 return KRB5_PROG_ETYPE_NOSUPP;
3783 if((*crypto)->et->keytype->minsize > key->keyvalue.length) {
3786 krb5_set_error_string (context, "encryption key has bad length");
3787 return KRB5_BAD_KEYSIZE;
3789 ret = krb5_copy_keyblock(context, key, &(*crypto)->key.key);
3795 (*crypto)->key.schedule = NULL;
3796 (*crypto)->num_key_usage = 0;
3797 (*crypto)->key_usage = NULL;
3798 (*crypto)->params = NULL;
3803 free_key_data(krb5_context context, struct key_data *key)
3805 krb5_free_keyblock(context, key->key);
3807 memset(key->schedule->data, 0, key->schedule->length);
3808 krb5_free_data(context, key->schedule);
3813 free_key_usage(krb5_context context, struct key_usage *ku)
3815 free_key_data(context, &ku->key);
3818 krb5_error_code KRB5_LIB_FUNCTION
3819 krb5_crypto_destroy(krb5_context context,
3824 for(i = 0; i < crypto->num_key_usage; i++)
3825 free_key_usage(context, &crypto->key_usage[i]);
3826 free(crypto->key_usage);
3827 free_key_data(context, &crypto->key);
3828 free(crypto->params);
3833 krb5_error_code KRB5_LIB_FUNCTION
3834 krb5_crypto_get_params(krb5_context context,
3835 const krb5_crypto crypto,
3836 const krb5_data *params,
3839 krb5_error_code (*gp)(krb5_context, const krb5_data *,void **,krb5_data *);
3840 krb5_error_code ret;
3842 gp = crypto->et->keytype->get_params;
3844 if (crypto->params) {
3845 krb5_set_error_string(context,
3846 "krb5_crypto_get_params called "
3848 return KRB5_PROG_ETYPE_NOSUPP;
3850 ret = (*gp)(context, params, &crypto->params, ivec);
3855 ret = decode_CBCParameter(params->data, params->length, ivec, &size);
3859 if (ivec->length < crypto->et->blocksize) {
3860 krb5_data_free(ivec);
3861 krb5_set_error_string(context, "%s IV of wrong size",
3863 return ASN1_PARSE_ERROR;
3868 krb5_error_code KRB5_LIB_FUNCTION
3869 krb5_crypto_set_params(krb5_context context,
3870 const krb5_crypto crypto,
3871 const krb5_data *ivec,
3874 krb5_error_code (*sp)(krb5_context, const void *,
3875 const krb5_data *, krb5_data *);
3876 krb5_error_code ret;
3878 sp = crypto->et->keytype->set_params;
3883 ASN1_MALLOC_ENCODE(CBCParameter, params->data, params->length,
3887 if (size != params->length)
3888 krb5_abortx(context, "Internal asn1 encoder failure");
3891 if (crypto->params) {
3892 krb5_set_error_string(context,
3893 "krb5_crypto_set_params called "
3895 return KRB5_PROG_ETYPE_NOSUPP;
3897 return (*sp)(context, crypto->params, ivec, params);
3901 krb5_error_code KRB5_LIB_FUNCTION
3902 krb5_crypto_getblocksize(krb5_context context,
3906 *blocksize = crypto->et->blocksize;
3910 krb5_error_code KRB5_LIB_FUNCTION
3911 krb5_crypto_getenctype(krb5_context context,
3913 krb5_enctype *enctype)
3915 *enctype = crypto->et->type;
3919 krb5_error_code KRB5_LIB_FUNCTION
3920 krb5_crypto_getpadsize(krb5_context context,
3924 *padsize = crypto->et->padsize;
3928 krb5_error_code KRB5_LIB_FUNCTION
3929 krb5_crypto_getconfoundersize(krb5_context context,
3931 size_t *confoundersize)
3933 *confoundersize = crypto->et->confoundersize;
3937 krb5_error_code KRB5_LIB_FUNCTION
3938 krb5_enctype_disable(krb5_context context,
3939 krb5_enctype enctype)
3941 struct encryption_type *et = _find_enctype(enctype);
3944 krb5_set_error_string (context, "encryption type %d not supported",
3946 return KRB5_PROG_ETYPE_NOSUPP;
3948 et->flags |= F_DISABLED;
3952 krb5_error_code KRB5_LIB_FUNCTION
3953 krb5_string_to_key_derived(krb5_context context,
3959 struct encryption_type *et = _find_enctype(etype);
3960 krb5_error_code ret;
3966 krb5_set_error_string (context, "encryption type %d not supported",
3968 return KRB5_PROG_ETYPE_NOSUPP;
3970 keylen = et->keytype->bits / 8;
3973 if(kd.key == NULL) {
3974 krb5_set_error_string (context, "malloc: out of memory");
3977 ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
3982 kd.key->keytype = etype;
3983 tmp = malloc (keylen);
3985 krb5_free_keyblock(context, kd.key);
3986 krb5_set_error_string (context, "malloc: out of memory");
3989 _krb5_n_fold(str, len, tmp, keylen);
3991 DES3_postproc (context, tmp, keylen, &kd); /* XXX */
3992 memset(tmp, 0, keylen);
3994 ret = derive_key(context,
3997 "kerberos", /* XXX well known constant */
3998 strlen("kerberos"));
3999 ret = krb5_copy_keyblock_contents(context, kd.key, key);
4000 free_key_data(context, &kd);
4005 wrapped_length (krb5_context context,
4009 struct encryption_type *et = crypto->et;
4010 size_t padsize = et->padsize;
4011 size_t checksumsize = CHECKSUMSIZE(et->checksum);
4014 res = et->confoundersize + checksumsize + data_len;
4015 res = (res + padsize - 1) / padsize * padsize;
4020 wrapped_length_dervied (krb5_context context,
4024 struct encryption_type *et = crypto->et;
4025 size_t padsize = et->padsize;
4028 res = et->confoundersize + data_len;
4029 res = (res + padsize - 1) / padsize * padsize;
4030 if (et->keyed_checksum)
4031 res += et->keyed_checksum->checksumsize;
4033 res += et->checksum->checksumsize;
4038 * Return the size of an encrypted packet of length `data_len'
4042 krb5_get_wrapped_length (krb5_context context,
4046 if (derived_crypto (context, crypto))
4047 return wrapped_length_dervied (context, crypto, data_len);
4049 return wrapped_length (context, crypto, data_len);
4052 krb5_error_code KRB5_LIB_FUNCTION
4053 krb5_random_to_key(krb5_context context,
4059 krb5_error_code ret;
4060 struct encryption_type *et = _find_enctype(type);
4062 krb5_set_error_string(context, "encryption type %d not supported",
4064 return KRB5_PROG_ETYPE_NOSUPP;
4066 if ((et->keytype->bits + 7) / 8 > size) {
4067 krb5_set_error_string(context, "encryption key %s needs %d bytes "
4068 "of random to make an encryption key out of it",
4069 et->name, (int)et->keytype->size);
4070 return KRB5_PROG_ETYPE_NOSUPP;
4072 ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
4075 key->keytype = type;
4076 if (et->keytype->random_to_key)
4077 (*et->keytype->random_to_key)(context, key, data, size);
4079 memcpy(key->keyvalue.data, data, et->keytype->size);
4085 _krb5_pk_octetstring2key(krb5_context context,
4089 const heim_octet_string *c_n,
4090 const heim_octet_string *k_n,
4093 struct encryption_type *et = _find_enctype(type);
4094 krb5_error_code ret;
4095 size_t keylen, offset;
4097 unsigned char counter;
4098 unsigned char shaoutput[20];
4101 krb5_set_error_string(context, "encryption type %d not supported",
4103 return KRB5_PROG_ETYPE_NOSUPP;
4105 keylen = (et->keytype->bits + 7) / 8;
4107 keydata = malloc(keylen);
4108 if (keydata == NULL) {
4109 krb5_set_error_string(context, "malloc: out of memory");
4119 SHA1_Update(&m, &counter, 1);
4120 SHA1_Update(&m, dhdata, dhsize);
4122 SHA1_Update(&m, c_n->data, c_n->length);
4124 SHA1_Update(&m, k_n->data, k_n->length);
4125 SHA1_Final(shaoutput, &m);
4127 memcpy((unsigned char *)keydata + offset,
4129 min(keylen - offset, sizeof(shaoutput)));
4131 offset += sizeof(shaoutput);
4133 } while(offset < keylen);
4134 memset(shaoutput, 0, sizeof(shaoutput));
4136 ret = krb5_random_to_key(context, type, keydata, keylen, key);
4137 memset(keydata, 0, sizeof(keylen));
4145 static krb5_error_code
4146 krb5_get_keyid(krb5_context context,
4151 unsigned char tmp[16];
4154 MD5_Update (&md5, key->keyvalue.data, key->keyvalue.length);
4155 MD5_Final (tmp, &md5);
4156 *keyid = (tmp[12] << 24) | (tmp[13] << 16) | (tmp[14] << 8) | tmp[15];
4161 krb5_crypto_debug(krb5_context context,
4168 krb5_get_keyid(context, key, &keyid);
4169 krb5_enctype_to_string(context, key->keytype, &kt);
4170 krb5_warnx(context, "%s %lu bytes with key-id %#x (%s)",
4171 encryptp ? "encrypting" : "decrypting",
4178 #endif /* CRYPTO_DEBUG */
4186 krb5_context context;
4191 unsigned usage = ENCRYPTION_USAGE(3);
4192 krb5_error_code ret;
4194 ret = krb5_init_context(&context);
4196 errx (1, "krb5_init_context failed: %d", ret);
4198 key.keytype = ETYPE_NEW_DES3_CBC_SHA1;
4199 key.keyvalue.data = "\xb3\x85\x58\x94\xd9\xdc\x7c\xc8"
4200 "\x25\xe9\x85\xab\x3e\xb5\xfb\x0e"
4201 "\xc8\xdf\xab\x26\x86\x64\x15\x25";
4202 key.keyvalue.length = 24;
4204 krb5_crypto_init(context, &key, 0, &crypto);
4206 d = _new_derived_key(crypto, usage);
4209 krb5_copy_keyblock(context, crypto->key.key, &d->key);
4210 _krb5_put_int(constant, usage, 4);
4211 derive_key(context, crypto->et, d, constant, sizeof(constant));
4215 krb5_context context;
4219 krb5_error_code ret;
4222 char *data = "what do ya want for nothing?";
4224 ret = krb5_init_context(&context);
4226 errx (1, "krb5_init_context failed: %d", ret);
4228 key.keytype = ETYPE_NEW_DES3_CBC_SHA1;
4229 key.keyvalue.data = "Jefe";
4230 /* "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"
4231 "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"; */
4232 key.keyvalue.length = 4;
4234 d = calloc(1, sizeof(*d));
4237 res.checksum.length = 20;
4238 res.checksum.data = malloc(res.checksum.length);
4239 SP_HMAC_SHA1_checksum(context, d, data, 28, &res);