5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 1997 - 2002 Pekka Riikonen
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; version 2 of the License.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
21 #include "silcincludes.h"
26 /* The main SILC PKCS structure. */
27 struct SilcPKCSStruct {
28 void *context; /* Algorithm internal context */
29 SilcPKCSObject *pkcs; /* Algorithm implementation */
30 SilcUInt32 key_len; /* Key length in bits */
34 /* Dynamically registered list of PKCS. */
35 SilcDList silc_pkcs_list = NULL;
36 #define SILC_PKCS_LIST silc_pkcs_list
38 #define SILC_PKCS_LIST TRUE
39 #endif /* SILC_EPOC */
41 /* Static list of PKCS for silc_pkcs_register_default(). */
42 const SilcPKCSObject silc_default_pkcs[] =
44 /* RSA with PKCS #1 (Uses directly routines from Raw RSA operations) */
46 silc_rsa_init, silc_rsa_clear_keys, silc_rsa_get_public_key,
47 silc_rsa_get_private_key, silc_rsa_set_public_key,
48 silc_rsa_set_private_key, silc_rsa_context_len,
49 silc_pkcs1_encrypt, silc_pkcs1_decrypt,
50 silc_pkcs1_sign, silc_pkcs1_verify },
52 /* Raw RSA operations */
54 silc_rsa_init, silc_rsa_clear_keys, silc_rsa_get_public_key,
55 silc_rsa_get_private_key, silc_rsa_set_public_key,
56 silc_rsa_set_private_key, silc_rsa_context_len,
57 silc_rsa_encrypt, silc_rsa_decrypt,
58 silc_rsa_sign, silc_rsa_verify },
60 { NULL, NULL, NULL, NULL, NULL,
61 NULL, NULL, NULL, NULL, NULL, NULL }
64 /* Register a new PKCS into SILC. This is used at the initialization of
67 bool silc_pkcs_register(const SilcPKCSObject *pkcs)
72 SILC_LOG_DEBUG(("Registering new PKCS `%s'", pkcs->name));
74 /* Check if exists already */
76 SilcPKCSObject *entry;
77 silc_dlist_start(silc_pkcs_list);
78 while ((entry = silc_dlist_get(silc_pkcs_list)) != SILC_LIST_END) {
79 if (!strcmp(entry->name, pkcs->name))
84 new = silc_calloc(1, sizeof(*new));
85 new->name = strdup(pkcs->name);
86 new->init = pkcs->init;
87 new->clear_keys = pkcs->clear_keys;
88 new->get_public_key = pkcs->get_public_key;
89 new->get_private_key = pkcs->get_private_key;
90 new->set_public_key = pkcs->set_public_key;
91 new->set_private_key = pkcs->set_private_key;
92 new->context_len = pkcs->context_len;
93 new->encrypt = pkcs->encrypt;
94 new->decrypt = pkcs->decrypt;
95 new->sign = pkcs->sign;
96 new->verify = pkcs->verify;
99 if (silc_pkcs_list == NULL)
100 silc_pkcs_list = silc_dlist_init();
101 silc_dlist_add(silc_pkcs_list, new);
103 #endif /* SILC_EPOC */
107 /* Unregister a PKCS from the SILC. */
109 bool silc_pkcs_unregister(SilcPKCSObject *pkcs)
112 SilcPKCSObject *entry;
114 SILC_LOG_DEBUG(("Unregistering PKCS"));
119 silc_dlist_start(silc_pkcs_list);
120 while ((entry = silc_dlist_get(silc_pkcs_list)) != SILC_LIST_END) {
121 if (pkcs == SILC_ALL_PKCS || entry == pkcs) {
122 silc_dlist_del(silc_pkcs_list, entry);
123 silc_free(entry->name);
126 if (silc_dlist_count(silc_pkcs_list) == 0) {
127 silc_dlist_uninit(silc_pkcs_list);
128 silc_pkcs_list = NULL;
135 #endif /* SILC_EPOC */
139 /* Function that registers all the default PKCS (all builtin PKCS).
140 The application may use this to register the default PKCS if specific
141 PKCS in any specific order is not wanted. */
143 bool silc_pkcs_register_default(void)
148 for (i = 0; silc_default_pkcs[i].name; i++)
149 silc_pkcs_register(&(silc_default_pkcs[i]));
151 #endif /* SILC_EPOC */
155 bool silc_pkcs_unregister_all(void)
158 SilcPKCSObject *entry;
163 silc_dlist_start(silc_pkcs_list);
164 while ((entry = silc_dlist_get(silc_pkcs_list)) != SILC_LIST_END) {
165 silc_pkcs_unregister(entry);
169 #endif /* SILC_EPOC */
173 /* Allocates a new SilcPKCS object. The new allocated object is returned
174 to the 'new_pkcs' argument. */
176 bool silc_pkcs_alloc(const unsigned char *name, SilcPKCS *new_pkcs)
178 SilcPKCSObject *entry = NULL;
180 SILC_LOG_DEBUG(("Allocating new PKCS object"));
183 if (silc_pkcs_list) {
184 silc_dlist_start(silc_pkcs_list);
185 while ((entry = silc_dlist_get(silc_pkcs_list)) != SILC_LIST_END) {
186 if (!strcmp(entry->name, name))
192 /* On EPOC which don't have globals we check our constant hash list. */
194 for (i = 0; silc_default_pkcs[i].name; i++) {
195 if (!strcmp(silc_default_pkcs[i].name, name)) {
196 entry = (SilcPKCSObject *)&(silc_default_pkcs[i]);
201 #endif /* SILC_EPOC */
204 *new_pkcs = silc_calloc(1, sizeof(**new_pkcs));
205 (*new_pkcs)->pkcs = entry;
206 (*new_pkcs)->context = silc_calloc(1, entry->context_len());
213 /* Free's the PKCS object */
215 void silc_pkcs_free(SilcPKCS pkcs)
218 pkcs->pkcs->clear_keys(pkcs->context);
219 silc_free(pkcs->context);
224 /* Return TRUE if PKCS algorithm `name' is supported. */
226 bool silc_pkcs_is_supported(const unsigned char *name)
229 SilcPKCSObject *entry;
231 if (silc_pkcs_list) {
232 silc_dlist_start(silc_pkcs_list);
233 while ((entry = silc_dlist_get(silc_pkcs_list)) != SILC_LIST_END) {
234 if (!strcmp(entry->name, name))
241 for (i = 0; silc_default_pkcs[i].name; i++)
242 if (!strcmp(silc_default_pkcs[i].name, name))
245 #endif /* SILC_EPOC */
249 /* Returns comma separated list of supported PKCS algorithms */
251 char *silc_pkcs_get_supported(void)
253 SilcPKCSObject *entry;
258 if (silc_pkcs_list) {
259 silc_dlist_start(silc_pkcs_list);
260 while ((entry = silc_dlist_get(silc_pkcs_list)) != SILC_LIST_END) {
261 len += strlen(entry->name);
262 list = silc_realloc(list, len + 1);
264 memcpy(list + (len - strlen(entry->name)),
265 entry->name, strlen(entry->name));
266 memcpy(list + len, ",", 1);
273 for (i = 0; silc_default_pkcs[i].name; i++) {
274 entry = (SilcPKCSObject *)&(silc_default_pkcs[i]);
275 len += strlen(entry->name);
276 list = silc_realloc(list, len + 1);
278 memcpy(list + (len - strlen(entry->name)),
279 entry->name, strlen(entry->name));
280 memcpy(list + len, ",", 1);
284 #endif /* SILC_EPOC */
291 /* Generate new key pair into the `pkcs' context. */
293 bool silc_pkcs_generate_key(SilcPKCS pkcs, SilcUInt32 bits_key_len,
296 return pkcs->pkcs->init(pkcs->context, bits_key_len, rng);
299 /* Returns the length of the key */
301 SilcUInt32 silc_pkcs_get_key_len(SilcPKCS pkcs)
303 return pkcs->key_len;
306 const char *silc_pkcs_get_name(SilcPKCS pkcs)
308 return pkcs->pkcs->name;
311 /* Returns SILC style public key */
313 unsigned char *silc_pkcs_get_public_key(SilcPKCS pkcs, SilcUInt32 *len)
315 return pkcs->pkcs->get_public_key(pkcs->context, len);
318 /* Returns SILC style private key */
320 unsigned char *silc_pkcs_get_private_key(SilcPKCS pkcs, SilcUInt32 *len)
322 return pkcs->pkcs->get_private_key(pkcs->context, len);
325 /* Sets public key from SilcPublicKey. */
327 SilcUInt32 silc_pkcs_public_key_set(SilcPKCS pkcs, SilcPublicKey public_key)
329 pkcs->key_len = pkcs->pkcs->set_public_key(pkcs->context, public_key->pk,
331 return pkcs->key_len;
334 /* Sets public key from data. */
336 SilcUInt32 silc_pkcs_public_key_data_set(SilcPKCS pkcs, unsigned char *pk,
339 pkcs->key_len = pkcs->pkcs->set_public_key(pkcs->context, pk, pk_len);
340 return pkcs->key_len;
343 /* Sets private key from SilcPrivateKey. */
345 SilcUInt32 silc_pkcs_private_key_set(SilcPKCS pkcs, SilcPrivateKey private_key)
348 key_len = pkcs->pkcs->set_private_key(pkcs->context, private_key->prv,
349 private_key->prv_len);
351 pkcs->key_len = key_len;
352 return pkcs->key_len;
355 /* Sets private key from data. */
357 SilcUInt32 silc_pkcs_private_key_data_set(SilcPKCS pkcs, unsigned char *prv,
361 key_len = pkcs->pkcs->set_private_key(pkcs->context, prv, prv_len);
363 pkcs->key_len = key_len;
364 return pkcs->key_len;
369 bool silc_pkcs_encrypt(SilcPKCS pkcs, unsigned char *src, SilcUInt32 src_len,
370 unsigned char *dst, SilcUInt32 *dst_len)
372 return pkcs->pkcs->encrypt(pkcs->context, src, src_len, dst, dst_len);
377 bool silc_pkcs_decrypt(SilcPKCS pkcs, unsigned char *src, SilcUInt32 src_len,
378 unsigned char *dst, SilcUInt32 *dst_len)
380 return pkcs->pkcs->decrypt(pkcs->context, src, src_len, dst, dst_len);
383 /* Generates signature */
385 bool silc_pkcs_sign(SilcPKCS pkcs, unsigned char *src, SilcUInt32 src_len,
386 unsigned char *dst, SilcUInt32 *dst_len)
388 return pkcs->pkcs->sign(pkcs->context, src, src_len, dst, dst_len);
391 /* Verifies signature */
393 bool silc_pkcs_verify(SilcPKCS pkcs, unsigned char *signature,
394 SilcUInt32 signature_len, unsigned char *data,
397 return pkcs->pkcs->verify(pkcs->context, signature, signature_len,
401 /* Generates signature with hash. The hash is signed. */
403 bool silc_pkcs_sign_with_hash(SilcPKCS pkcs, SilcHash hash,
404 unsigned char *src, SilcUInt32 src_len,
405 unsigned char *dst, SilcUInt32 *dst_len)
407 unsigned char hashr[32];
411 silc_hash_make(hash, src, src_len, hashr);
412 hash_len = silc_hash_len(hash);
414 SILC_LOG_HEXDUMP(("Hash"), hashr, hash_len);
416 ret = pkcs->pkcs->sign(pkcs->context, hashr, hash_len, dst, dst_len);
417 memset(hashr, 0, sizeof(hashr));
422 /* Verifies signature with hash. The `data' is hashed and verified against
425 bool silc_pkcs_verify_with_hash(SilcPKCS pkcs, SilcHash hash,
426 unsigned char *signature,
427 SilcUInt32 signature_len,
431 unsigned char hashr[32];
435 silc_hash_make(hash, data, data_len, hashr);
436 hash_len = silc_hash_len(hash);
438 SILC_LOG_HEXDUMP(("Hash"), hashr, hash_len);
440 ret = pkcs->pkcs->verify(pkcs->context, signature, signature_len,
442 memset(hashr, 0, sizeof(hashr));
447 /* Encodes and returns SILC public key identifier. If some of the
448 arguments is NULL those are not encoded into the identifier string.
449 Protocol says that at least username and host must be provided. */
451 char *silc_pkcs_encode_identifier(char *username, char *host, char *realname,
452 char *email, char *org, char *country)
456 SilcUInt32 len, tlen = 0;
458 if (!username || !host)
461 len = (username ? strlen(username) : 0) +
462 (host ? strlen(host) : 0) +
463 (realname ? strlen(realname) : 0) +
464 (email ? strlen(email) : 0) +
465 (org ? strlen(org) : 0) +
466 (country ? strlen(country) : 0);
471 len += 3 + 5 + 5 + 4 + 4 + 4;
472 buf = silc_buffer_alloc(len);
473 silc_buffer_pull_tail(buf, len);
476 silc_buffer_format(buf,
477 SILC_STR_UI32_STRING("UN="),
478 SILC_STR_UI32_STRING(username),
480 silc_buffer_pull(buf, 3 + strlen(username));
481 tlen = 3 + strlen(username);
485 silc_buffer_format(buf,
486 SILC_STR_UI32_STRING(", "),
487 SILC_STR_UI32_STRING("HN="),
488 SILC_STR_UI32_STRING(host),
490 silc_buffer_pull(buf, 5 + strlen(host));
491 tlen += 5 + strlen(host);
495 silc_buffer_format(buf,
496 SILC_STR_UI32_STRING(", "),
497 SILC_STR_UI32_STRING("RN="),
498 SILC_STR_UI32_STRING(realname),
500 silc_buffer_pull(buf, 5 + strlen(realname));
501 tlen += 5 + strlen(realname);
505 silc_buffer_format(buf,
506 SILC_STR_UI32_STRING(", "),
507 SILC_STR_UI32_STRING("E="),
508 SILC_STR_UI32_STRING(email),
510 silc_buffer_pull(buf, 4 + strlen(email));
511 tlen += 4 + strlen(email);
515 silc_buffer_format(buf,
516 SILC_STR_UI32_STRING(", "),
517 SILC_STR_UI32_STRING("O="),
518 SILC_STR_UI32_STRING(org),
520 silc_buffer_pull(buf, 4 + strlen(org));
521 tlen += 4 + strlen(org);
525 silc_buffer_format(buf,
526 SILC_STR_UI32_STRING(", "),
527 SILC_STR_UI32_STRING("C="),
528 SILC_STR_UI32_STRING(country),
530 silc_buffer_pull(buf, 4 + strlen(country));
531 tlen += 4 + strlen(country);
534 silc_buffer_push(buf, buf->data - buf->head);
535 identifier = silc_calloc(tlen + 1, sizeof(*identifier));
536 memcpy(identifier, buf->data, tlen);
537 silc_buffer_free(buf);
542 /* Decodes the provided `identifier' and returns allocated context for
545 SilcPublicKeyIdentifier silc_pkcs_decode_identifier(char *identifier)
547 SilcPublicKeyIdentifier ident;
551 ident = silc_calloc(1, sizeof(*ident));
555 len = strcspn(cp, ",");
556 if (len - 1 >= 0 && cp[len - 1] == '\\') {
559 len = strcspn(cp, ",") + len;
560 if (len - 1 >= 0 && cp[len - 1] != '\\')
565 item = silc_calloc(len + 1, sizeof(char));
566 memcpy(item, cp, len);
568 if (strstr(item, "UN="))
569 ident->username = strdup(item + strcspn(cp, "=") + 1);
570 else if (strstr(item, "HN="))
571 ident->host = strdup(item + strcspn(cp, "=") + 1);
572 else if (strstr(item, "RN="))
573 ident->realname = strdup(item + strcspn(cp, "=") + 1);
574 else if (strstr(item, "E="))
575 ident->email = strdup(item + strcspn(cp, "=") + 1);
576 else if (strstr(item, "O="))
577 ident->org = strdup(item + strcspn(cp, "=") + 1);
578 else if (strstr(item, "C="))
579 ident->country = strdup(item + strcspn(cp, "=") + 1);
594 /* Free's decoded public key identifier context. Call this to free the
595 context returned by the silc_pkcs_decode_identifier. */
597 void silc_pkcs_free_identifier(SilcPublicKeyIdentifier identifier)
599 silc_free(identifier->username);
600 silc_free(identifier->host);
601 silc_free(identifier->realname);
602 silc_free(identifier->email);
603 silc_free(identifier->org);
604 silc_free(identifier->country);
605 silc_free(identifier);
608 /* Allocates SILC style public key formed from sent arguments. All data
611 SilcPublicKey silc_pkcs_public_key_alloc(const char *name,
612 const char *identifier,
613 const unsigned char *pk,
616 SilcPublicKey public_key;
619 public_key = silc_calloc(1, sizeof(*public_key));
620 public_key->name = strdup(name);
621 public_key->pk_len = pk_len;
622 public_key->pk = silc_calloc(pk_len, sizeof(*public_key->pk));
623 public_key->pk_type = SILC_SKE_PK_TYPE_SILC;
624 memcpy(public_key->pk, pk, pk_len);
626 if (!silc_utf8_valid(identifier, strlen(identifier))) {
627 int len = silc_utf8_encoded_len(identifier, strlen(identifier), 0);
628 tmp = silc_calloc(len + 1, sizeof(*tmp));
629 silc_utf8_encode(identifier, strlen(identifier), 0, tmp, len);
633 public_key->identifier = strdup(identifier);
634 public_key->len = 2 + strlen(name) + 2 + strlen(identifier) + pk_len;
640 /* Free's public key */
642 void silc_pkcs_public_key_free(SilcPublicKey public_key)
645 silc_free(public_key->name);
646 silc_free(public_key->identifier);
647 silc_free(public_key->pk);
648 silc_free(public_key);
652 /* Allocates SILC private key formed from sent arguments. All data is
655 SilcPrivateKey silc_pkcs_private_key_alloc(const char *name,
656 const unsigned char *prv,
659 SilcPrivateKey private_key;
661 private_key = silc_calloc(1, sizeof(*private_key));
662 private_key->name = strdup(name);
663 private_key->prv_len = prv_len;
664 private_key->prv = silc_calloc(prv_len, sizeof(*private_key->prv));
665 memcpy(private_key->prv, prv, prv_len);
670 /* Free's private key */
672 void silc_pkcs_private_key_free(SilcPrivateKey private_key)
675 silc_free(private_key->name);
676 silc_free(private_key->prv);
677 silc_free(private_key);
681 /* Encodes SILC style public key from SilcPublicKey. Returns the encoded
685 silc_pkcs_public_key_encode(SilcPublicKey public_key, SilcUInt32 *len)
690 buf = silc_buffer_alloc(public_key->len + 4);
691 silc_buffer_pull_tail(buf, SILC_BUFFER_END(buf));
693 silc_buffer_format(buf,
694 SILC_STR_UI_INT(public_key->len),
695 SILC_STR_UI_SHORT(strlen(public_key->name)),
696 SILC_STR_UI32_STRING(public_key->name),
697 SILC_STR_UI_SHORT(strlen(public_key->identifier)),
698 SILC_STR_UI32_STRING(public_key->identifier),
699 SILC_STR_UI_XNSTRING(public_key->pk,
703 *len = public_key->len + 4;
705 ret = silc_calloc(buf->len, sizeof(*ret));
706 memcpy(ret, buf->data, buf->len);
707 silc_buffer_free(buf);
712 /* Encodes SILC style public key. Returns the encoded data. */
715 silc_pkcs_public_key_data_encode(unsigned char *pk, SilcUInt32 pk_len,
716 char *pkcs, char *identifier,
723 totlen = 2 + strlen(pkcs) + 2 + strlen(identifier) + pk_len;
724 buf = silc_buffer_alloc(totlen + 4);
725 silc_buffer_pull_tail(buf, SILC_BUFFER_END(buf));
727 silc_buffer_format(buf,
728 SILC_STR_UI_INT(totlen),
729 SILC_STR_UI_SHORT(strlen(pkcs)),
730 SILC_STR_UI32_STRING(pkcs),
731 SILC_STR_UI_SHORT(strlen(identifier)),
732 SILC_STR_UI32_STRING(identifier),
733 SILC_STR_UI_XNSTRING(pk, pk_len),
738 ret = silc_calloc(buf->len, sizeof(*ret));
739 memcpy(ret, buf->data, buf->len);
740 silc_buffer_free(buf);
745 /* Decodes SILC style public key. Returns TRUE if the decoding was
746 successful. Allocates new public key as well. */
748 bool silc_pkcs_public_key_decode(unsigned char *data, SilcUInt32 data_len,
749 SilcPublicKey *public_key)
753 SilcUInt16 pkcs_len, identifier_len;
754 SilcUInt32 totlen, key_len;
755 unsigned char *pkcs_name = NULL, *ident = NULL, *key_data = NULL;
758 buf = silc_buffer_alloc(data_len);
759 silc_buffer_pull_tail(buf, SILC_BUFFER_END(buf));
760 silc_buffer_put(buf, data, data_len);
763 ret = silc_buffer_unformat(buf,
764 SILC_STR_UI_INT(&totlen),
767 silc_buffer_free(buf);
771 #if 1 /* Backwards support, remove! */
772 if (totlen == data_len)
776 if (totlen + 4 != data_len) {
777 silc_buffer_free(buf);
781 /* Get algorithm name and identifier */
782 silc_buffer_pull(buf, 4);
784 silc_buffer_unformat(buf,
785 SILC_STR_UI16_NSTRING_ALLOC(&pkcs_name, &pkcs_len),
786 SILC_STR_UI16_NSTRING_ALLOC(&ident, &identifier_len),
791 if (pkcs_len < 1 || identifier_len < 3 ||
792 pkcs_len + identifier_len > totlen)
795 /* See if we support this algorithm (check only if PKCS are registered) */
796 if (SILC_PKCS_LIST && !silc_pkcs_is_supported(pkcs_name)) {
797 SILC_LOG_DEBUG(("Unknown PKCS %s", pkcs_name));
801 /* Protocol says that at least UN and HN must be provided as identifier,
803 if (!strstr(ident, "UN=") && !strstr(ident, "HN=")) {
804 SILC_LOG_DEBUG(("The public does not have the required UN= and HN= "
809 /* Get key data. We assume that rest of the buffer is key data. */
810 silc_buffer_pull(buf, 2 + pkcs_len + 2 + identifier_len);
812 ret = silc_buffer_unformat(buf,
813 SILC_STR_UI_XNSTRING_ALLOC(&key_data, key_len),
818 /* Try to set the key. If this fails the key must be malformed. This
819 code assumes that the PKCS routine checks the format of the key.
820 (check only if PKCS are registered) */
821 if (SILC_PKCS_LIST) {
822 silc_pkcs_alloc(pkcs_name, &alg);
823 if (!alg->pkcs->set_public_key(alg->context, key_data, key_len))
829 *public_key = silc_calloc(1, sizeof(**public_key));
830 (*public_key)->len = totlen;
831 (*public_key)->name = pkcs_name;
832 (*public_key)->identifier = ident;
833 (*public_key)->pk = key_data;
834 (*public_key)->pk_len = key_len;
835 (*public_key)->pk_type = SILC_SKE_PK_TYPE_SILC;
838 silc_buffer_free(buf);
843 silc_free(pkcs_name);
848 silc_buffer_free(buf);
852 /* Encodes Public Key Payload for transmitting public keys and certificates. */
854 SilcBuffer silc_pkcs_public_key_payload_encode(SilcPublicKey public_key)
863 pk = silc_pkcs_public_key_encode(public_key, &pk_len);
867 buffer = silc_buffer_alloc_size(4 + pk_len);
873 silc_buffer_format(buffer,
874 SILC_STR_UI_SHORT(pk_len),
875 SILC_STR_UI_SHORT(public_key->pk_type),
876 SILC_STR_UI_XNSTRING(pk, pk_len),
883 /* Decode Public Key Payload and decodes the public key inside it to
886 bool silc_pkcs_public_key_payload_decode(unsigned char *data,
888 SilcPublicKey *public_key)
890 SilcBufferStruct buf;
891 SilcUInt16 pk_len, pk_type;
898 silc_buffer_set(&buf, data, data_len);
899 ret = silc_buffer_unformat(&buf,
900 SILC_STR_UI_SHORT(&pk_len),
901 SILC_STR_UI_SHORT(&pk_type),
903 if (ret < 0 || pk_len > data_len - 4)
906 /* For now we support only SILC public keys */
907 if (pk_type != SILC_SKE_PK_TYPE_SILC)
910 silc_buffer_pull(&buf, 4);
911 ret = silc_buffer_unformat(&buf,
912 SILC_STR_UI_XNSTRING(&pk, pk_len),
914 silc_buffer_push(&buf, 4);
918 if (!silc_pkcs_public_key_decode(pk, pk_len, public_key))
920 (*public_key)->pk_type = SILC_SKE_PK_TYPE_SILC;
925 /* Compares two public keys and returns TRUE if they are same key, and
926 FALSE if they are not same. */
928 bool silc_pkcs_public_key_compare(SilcPublicKey key1, SilcPublicKey key2)
933 if (key1->len == key2->len &&
934 key1->name && key2->name && key1->identifier && key2->identifier &&
935 !strcmp(key1->name, key2->name) &&
936 !strcmp(key1->identifier, key2->identifier) &&
937 !memcmp(key1->pk, key2->pk, key1->pk_len) &&
938 key1->pk_len == key2->pk_len)
944 /* Copies the public key indicated by `public_key' and returns new allocated
945 public key which is indentical to the `public_key'. */
947 SilcPublicKey silc_pkcs_public_key_copy(SilcPublicKey public_key)
949 SilcPublicKey key = silc_calloc(1, sizeof(*key));
953 key->len = public_key->len;
954 key->name = silc_memdup(public_key->name, strlen(public_key->name));
955 key->identifier = silc_memdup(public_key->identifier,
956 strlen(public_key->identifier));
957 key->pk = silc_memdup(public_key->pk, public_key->pk_len);
958 key->pk_len = public_key->pk_len;
959 key->pk_type = public_key->pk_type;
964 /* Encodes SILC private key from SilcPrivateKey. Returns the encoded data. */
967 silc_pkcs_private_key_encode(SilcPrivateKey private_key, SilcUInt32 *len)
973 totlen = 2 + strlen(private_key->name) + private_key->prv_len;
974 buf = silc_buffer_alloc(totlen);
975 silc_buffer_pull_tail(buf, SILC_BUFFER_END(buf));
977 silc_buffer_format(buf,
978 SILC_STR_UI_SHORT(strlen(private_key->name)),
979 SILC_STR_UI32_STRING(private_key->name),
980 SILC_STR_UI_XNSTRING(private_key->prv,
981 private_key->prv_len),
986 ret = silc_calloc(buf->len, sizeof(*ret));
987 memcpy(ret, buf->data, buf->len);
988 silc_buffer_clear(buf);
989 silc_buffer_free(buf);
994 /* Encodes SILC private key. Returns the encoded data. */
997 silc_pkcs_private_key_data_encode(unsigned char *prv, SilcUInt32 prv_len,
998 char *pkcs, SilcUInt32 *len)
1004 totlen = 2 + strlen(pkcs) + prv_len;
1005 buf = silc_buffer_alloc(totlen);
1006 silc_buffer_pull_tail(buf, totlen);
1008 silc_buffer_format(buf,
1009 SILC_STR_UI_SHORT(strlen(pkcs)),
1010 SILC_STR_UI32_STRING(pkcs),
1011 SILC_STR_UI_XNSTRING(prv, prv_len),
1016 ret = silc_calloc(buf->len, sizeof(*ret));
1017 memcpy(ret, buf->data, buf->len);
1018 silc_buffer_clear(buf);
1019 silc_buffer_free(buf);
1024 /* Decodes SILC style private key. Returns TRUE if the decoding was
1025 successful. Allocates new private key as well. */
1027 bool silc_pkcs_private_key_decode(unsigned char *data, SilcUInt32 data_len,
1028 SilcPrivateKey *private_key)
1032 SilcUInt16 pkcs_len;
1034 unsigned char *pkcs_name = NULL, *key_data = NULL;
1037 buf = silc_buffer_alloc(data_len);
1038 silc_buffer_pull_tail(buf, SILC_BUFFER_END(buf));
1039 silc_buffer_put(buf, data, data_len);
1041 /* Get algorithm name and identifier */
1043 silc_buffer_unformat(buf,
1044 SILC_STR_UI16_NSTRING_ALLOC(&pkcs_name, &pkcs_len),
1047 SILC_LOG_DEBUG(("Cannot decode private key buffer"));
1051 if (pkcs_len < 1 || pkcs_len > buf->truelen) {
1052 SILC_LOG_DEBUG(("Malformed private key buffer"));
1056 /* See if we support this algorithm (check only if PKCS are registered). */
1057 if (SILC_PKCS_LIST && !silc_pkcs_is_supported(pkcs_name)) {
1058 SILC_LOG_DEBUG(("Unknown PKCS `%s'", pkcs_name));
1062 /* Get key data. We assume that rest of the buffer is key data. */
1063 silc_buffer_pull(buf, 2 + pkcs_len);
1065 ret = silc_buffer_unformat(buf,
1066 SILC_STR_UI_XNSTRING_ALLOC(&key_data, key_len),
1071 /* Try to set the key. If this fails the key must be malformed. This
1072 code assumes that the PKCS routine checks the format of the key.
1073 (check only if PKCS are registered) */
1074 if (SILC_PKCS_LIST) {
1075 silc_pkcs_alloc(pkcs_name, &alg);
1076 if (!alg->pkcs->set_private_key(alg->context, key_data, key_len)) {
1077 SILC_LOG_DEBUG(("Could not set private key data"));
1080 silc_pkcs_free(alg);
1084 *private_key = silc_calloc(1, sizeof(**private_key));
1085 (*private_key)->name = pkcs_name;
1086 (*private_key)->prv = key_data;
1087 (*private_key)->prv_len = key_len;
1090 silc_buffer_clear(buf);
1091 silc_buffer_free(buf);
1096 silc_free(pkcs_name);
1098 silc_free(key_data);
1099 silc_buffer_clear(buf);
1100 silc_buffer_free(buf);
1104 /* Internal routine to save public key */
1106 static bool silc_pkcs_save_public_key_internal(const char *filename,
1107 unsigned char *data,
1108 SilcUInt32 data_len,
1109 SilcUInt32 encoding)
1115 case SILC_PKCS_FILE_BIN:
1117 case SILC_PKCS_FILE_PEM:
1118 data = silc_pem_encode_file(data, data_len);
1119 data_len = strlen(data);
1123 len = data_len + (strlen(SILC_PKCS_PUBLIC_KEYFILE_BEGIN) +
1124 strlen(SILC_PKCS_PUBLIC_KEYFILE_END));
1125 buf = silc_buffer_alloc(len);
1126 silc_buffer_pull_tail(buf, SILC_BUFFER_END(buf));
1128 silc_buffer_format(buf,
1129 SILC_STR_UI32_STRING(SILC_PKCS_PUBLIC_KEYFILE_BEGIN),
1130 SILC_STR_UI_XNSTRING(data, data_len),
1131 SILC_STR_UI32_STRING(SILC_PKCS_PUBLIC_KEYFILE_END),
1134 /* Save into file */
1135 if (silc_file_writefile(filename, buf->data, buf->len)) {
1136 silc_buffer_free(buf);
1140 silc_buffer_free(buf);
1144 /* Saves public key into file */
1146 bool silc_pkcs_save_public_key(const char *filename, SilcPublicKey public_key,
1147 SilcUInt32 encoding)
1149 unsigned char *data;
1150 SilcUInt32 data_len;
1153 data = silc_pkcs_public_key_encode(public_key, &data_len);
1154 ret = silc_pkcs_save_public_key_internal(filename, data, data_len,
1160 /* Saves public key into file */
1162 bool silc_pkcs_save_public_key_data(const char *filename, unsigned char *data,
1163 SilcUInt32 data_len, SilcUInt32 encoding)
1165 return silc_pkcs_save_public_key_internal(filename, data, data_len,
1169 #define SILC_PKCS_PRIVATE_KEY_MAGIC 0x738df531
1171 /* Internal routine to save private key. */
1173 static bool silc_pkcs_save_private_key_internal(const char *filename,
1174 unsigned char *data,
1175 SilcUInt32 data_len,
1178 SilcUInt32 encoding)
1183 SilcBuffer buf, enc;
1184 SilcUInt32 len, blocklen, padlen;
1185 unsigned char tmp[32], keymat[64];
1188 memset(tmp, 0, sizeof(tmp));
1189 memset(keymat, 0, sizeof(keymat));
1191 /* Allocate the AES cipher */
1192 if (!silc_cipher_alloc("aes-256-cbc", &aes)) {
1193 SILC_LOG_ERROR(("Could not allocate AES cipher, probably not registered"));
1196 blocklen = silc_cipher_get_block_len(aes);
1197 if (blocklen * 2 > sizeof(tmp))
1200 /* Allocate SHA1 hash */
1201 if (!silc_hash_alloc("sha1", &sha1)) {
1202 SILC_LOG_ERROR(("Could not allocate SHA1 hash, probably not registered"));
1203 silc_cipher_free(aes);
1208 if (!silc_hmac_alloc("hmac-sha1-96", NULL, &sha1hmac)) {
1209 SILC_LOG_ERROR(("Could not allocate SHA1 HMAC, probably not registered"));
1210 silc_hash_free(sha1);
1211 silc_cipher_free(aes);
1215 /* Derive the encryption key from the provided key material. The key
1216 is 256 bits length, and derived by taking hash of the data, then
1217 re-hashing the data and the previous digest, and using the first and
1218 second digest as the key. */
1219 silc_hash_init(sha1);
1220 silc_hash_update(sha1, key, key_len);
1221 silc_hash_final(sha1, keymat);
1222 silc_hash_init(sha1);
1223 silc_hash_update(sha1, key, key_len);
1224 silc_hash_update(sha1, keymat, 16);
1225 silc_hash_final(sha1, keymat + 16);
1227 /* Set the key to the cipher */
1228 silc_cipher_set_key(aes, keymat, 256);
1230 /* Encode the buffer to be encrypted. Add padding to it too, at least
1231 block size of the cipher. */
1233 /* Allocate buffer for encryption */
1234 len = silc_hmac_len(sha1hmac);
1235 padlen = 16 + (16 - ((data_len + 4) % blocklen));
1236 enc = silc_buffer_alloc_size(4 + 4 + data_len + padlen + len);
1238 silc_hmac_free(sha1hmac);
1239 silc_hash_free(sha1);
1240 silc_cipher_free(aes);
1244 /* Generate padding */
1245 for (i = 0; i < padlen; i++)
1246 tmp[i] = silc_rng_global_get_byte_fast();
1248 /* Put magic number */
1249 SILC_PUT32_MSB(SILC_PKCS_PRIVATE_KEY_MAGIC, enc->data);
1250 silc_buffer_pull(enc, 4);
1252 /* Encode the buffer */
1253 silc_buffer_format(enc,
1254 SILC_STR_UI_INT(data_len),
1255 SILC_STR_UI_XNSTRING(data, data_len),
1256 SILC_STR_UI_XNSTRING(tmp, padlen),
1260 silc_cipher_encrypt(aes, enc->data, enc->data, enc->len - len,
1261 silc_cipher_get_iv(aes));
1263 silc_buffer_push(enc, 4);
1265 /* Compute HMAC over the encrypted data and append the MAC to data.
1266 The key is the first digest of the original key material. */
1267 data_len = enc->len - len;
1268 silc_hmac_init_with_key(sha1hmac, keymat, 16);
1269 silc_hmac_update(sha1hmac, enc->data, data_len);
1270 silc_buffer_pull(enc, data_len);
1271 silc_hmac_final(sha1hmac, enc->data, NULL);
1272 silc_buffer_push(enc, data_len);
1275 memset(keymat, 0, sizeof(keymat));
1276 memset(tmp, 0, sizeof(tmp));
1277 silc_hmac_free(sha1hmac);
1278 silc_hash_free(sha1);
1279 silc_cipher_free(aes);
1282 data_len = enc->len;
1285 case SILC_PKCS_FILE_BIN:
1287 case SILC_PKCS_FILE_PEM:
1288 data = silc_pem_encode_file(data, data_len);
1289 data_len = strlen(data);
1293 /* Encode the data and save to file */
1294 len = data_len + (strlen(SILC_PKCS_PRIVATE_KEYFILE_BEGIN) +
1295 strlen(SILC_PKCS_PRIVATE_KEYFILE_END));
1296 buf = silc_buffer_alloc_size(len);
1297 silc_buffer_format(buf,
1298 SILC_STR_UI32_STRING(SILC_PKCS_PRIVATE_KEYFILE_BEGIN),
1299 SILC_STR_UI_XNSTRING(data, data_len),
1300 SILC_STR_UI32_STRING(SILC_PKCS_PRIVATE_KEYFILE_END),
1303 /* Save into a file */
1304 if (silc_file_writefile_mode(filename, buf->data, buf->len, 0600)) {
1305 silc_buffer_clear(buf);
1306 silc_buffer_free(buf);
1307 silc_buffer_clear(enc);
1308 silc_buffer_free(enc);
1312 silc_buffer_clear(buf);
1313 silc_buffer_free(buf);
1314 silc_buffer_clear(enc);
1315 silc_buffer_free(enc);
1319 /* Saves private key into file. */
1321 bool silc_pkcs_save_private_key(const char *filename,
1322 SilcPrivateKey private_key,
1323 unsigned char *passphrase,
1324 SilcUInt32 passphrase_len,
1325 SilcUInt32 encoding)
1327 unsigned char *data;
1328 SilcUInt32 data_len;
1331 data = silc_pkcs_private_key_encode(private_key, &data_len);
1332 ret = silc_pkcs_save_private_key_internal(filename, data, data_len,
1333 passphrase, passphrase_len,
1335 memset(data, 0, data_len);
1340 /* Loads public key from file and allocates new public key. Returns TRUE
1341 if loading was successful. */
1343 bool silc_pkcs_load_public_key(const char *filename, SilcPublicKey *public_key,
1344 SilcUInt32 encoding)
1346 unsigned char *cp, *old, *data, byte;
1347 SilcUInt32 i, data_len, len;
1349 SILC_LOG_DEBUG(("Loading public key `%s' with %s encoding", filename,
1350 encoding == SILC_PKCS_FILE_PEM ? "Base64" :
1351 encoding == SILC_PKCS_FILE_BIN ? "Binary" : "Unkonwn"));
1353 old = data = silc_file_readfile(filename, &data_len);
1357 /* Check start of file and remove header from the data. */
1358 len = strlen(SILC_PKCS_PUBLIC_KEYFILE_BEGIN);
1360 for (i = 0; i < len; i++) {
1363 if (byte != SILC_PKCS_PUBLIC_KEYFILE_BEGIN[i]) {
1364 memset(old, 0, data_len);
1371 /* Decode public key */
1373 len = data_len - (strlen(SILC_PKCS_PUBLIC_KEYFILE_BEGIN) +
1374 strlen(SILC_PKCS_PUBLIC_KEYFILE_END));
1377 case SILC_PKCS_FILE_BIN:
1379 case SILC_PKCS_FILE_PEM:
1380 data = silc_pem_decode(data, len, &len);
1381 memset(old, 0, data_len);
1388 if (!data || !silc_pkcs_public_key_decode(data, len, public_key)) {
1389 memset(old, 0, data_len);
1395 memset(old, 0, data_len);
1400 /* Load private key from file and allocates new private key. Returns TRUE
1401 if loading was successful. */
1403 bool silc_pkcs_load_private_key(const char *filename,
1404 SilcPrivateKey *private_key,
1405 unsigned char *passphrase,
1406 SilcUInt32 passphrase_len,
1407 SilcUInt32 encoding)
1412 SilcUInt32 blocklen;
1413 unsigned char tmp[32], keymat[64];
1414 unsigned char *cp, *old, *data, byte;
1415 SilcUInt32 i, data_len, len, magic, mac_len;
1417 SILC_LOG_DEBUG(("Loading private key `%s' with %s encoding", filename,
1418 encoding == SILC_PKCS_FILE_PEM ? "Base64" :
1419 encoding == SILC_PKCS_FILE_BIN ? "Binary" : "Unkonwn"));
1421 old = data = silc_file_readfile(filename, &data_len);
1425 /* Check start of file and remove header from the data. */
1426 len = strlen(SILC_PKCS_PRIVATE_KEYFILE_BEGIN);
1428 for (i = 0; i < len; i++) {
1431 if (byte != SILC_PKCS_PRIVATE_KEYFILE_BEGIN[i]) {
1432 memset(old, 0, data_len);
1439 /* Decode private key */
1440 len = data_len - (strlen(SILC_PKCS_PRIVATE_KEYFILE_BEGIN) +
1441 strlen(SILC_PKCS_PRIVATE_KEYFILE_END));
1444 case SILC_PKCS_FILE_BIN:
1446 case SILC_PKCS_FILE_PEM:
1447 data = silc_pem_decode(data, len, &len);
1449 memset(old, 0, data_len);
1456 memset(tmp, 0, sizeof(tmp));
1457 memset(keymat, 0, sizeof(keymat));
1459 /* Private key files without the specific magic number are assumed
1460 to be the old-style private keys that are not encrypted. */
1461 SILC_GET32_MSB(magic, data);
1462 if (magic != SILC_PKCS_PRIVATE_KEY_MAGIC) {
1463 SILC_LOG_DEBUG(("Private key does not have correct magic!"));
1465 /* Now decode the actual private key */
1466 if (!silc_pkcs_private_key_decode(data, len, private_key)) {
1467 memset(old, 0, data_len);
1472 memset(old, 0, data_len);
1477 /* Allocate the AES cipher */
1478 if (!silc_cipher_alloc("aes-256-cbc", &aes)) {
1479 SILC_LOG_ERROR(("Could not allocate AES cipher, probably not registered"));
1480 memset(old, 0, data_len);
1484 blocklen = silc_cipher_get_block_len(aes);
1485 if (blocklen * 2 > sizeof(tmp)) {
1486 memset(old, 0, data_len);
1491 /* Allocate SHA1 hash */
1492 if (!silc_hash_alloc("sha1", &sha1)) {
1493 SILC_LOG_ERROR(("Could not allocate SHA1 hash, probably not registered"));
1494 silc_cipher_free(aes);
1495 memset(old, 0, data_len);
1501 if (!silc_hmac_alloc("hmac-sha1-96", NULL, &sha1hmac)) {
1502 SILC_LOG_ERROR(("Could not allocate SHA1 HMAC, probably not registered"));
1503 silc_hash_free(sha1);
1504 silc_cipher_free(aes);
1505 memset(old, 0, data_len);
1510 /* Derive the decryption key from the provided key material. The key
1511 is 256 bits length, and derived by taking hash of the data, then
1512 re-hashing the data and the previous digest, and using the first and
1513 second digest as the key. */
1514 silc_hash_init(sha1);
1515 silc_hash_update(sha1, passphrase, passphrase_len);
1516 silc_hash_final(sha1, keymat);
1517 silc_hash_init(sha1);
1518 silc_hash_update(sha1, passphrase, passphrase_len);
1519 silc_hash_update(sha1, keymat, 16);
1520 silc_hash_final(sha1, keymat + 16);
1522 /* Set the key to the cipher */
1523 silc_cipher_set_key(aes, keymat, 256);
1525 /* First, verify the MAC of the private key data */
1526 mac_len = silc_hmac_len(sha1hmac);
1527 silc_hmac_init_with_key(sha1hmac, keymat, 16);
1528 silc_hmac_update(sha1hmac, data, len - mac_len);
1529 silc_hmac_final(sha1hmac, tmp, NULL);
1530 if (memcmp(tmp, data + (len - mac_len), mac_len)) {
1531 SILC_LOG_DEBUG(("Integrity check for private key failed"));
1532 memset(keymat, 0, sizeof(keymat));
1533 memset(tmp, 0, sizeof(tmp));
1534 silc_hmac_free(sha1hmac);
1535 silc_hash_free(sha1);
1536 silc_cipher_free(aes);
1537 memset(old, 0, data_len);
1544 /* Decrypt the private key buffer */
1545 silc_cipher_decrypt(aes, data, data, len - mac_len, NULL);
1546 SILC_GET32_MSB(i, data);
1548 SILC_LOG_DEBUG(("Bad private key length in buffer!"));
1549 memset(keymat, 0, sizeof(keymat));
1550 memset(tmp, 0, sizeof(tmp));
1551 silc_hmac_free(sha1hmac);
1552 silc_hash_free(sha1);
1553 silc_cipher_free(aes);
1554 memset(old, 0, data_len);
1562 memset(keymat, 0, sizeof(keymat));
1563 memset(tmp, 0, sizeof(tmp));
1564 silc_hmac_free(sha1hmac);
1565 silc_hash_free(sha1);
1566 silc_cipher_free(aes);
1568 /* Now decode the actual private key */
1569 if (!silc_pkcs_private_key_decode(data, len, private_key)) {
1570 memset(old, 0, data_len);
1575 memset(old, 0, data_len);