2 This file is part of GNUnet
3 Copyright (C) 2010-2015 GNUnet e.V.
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
22 * @file identity-token/identity_token.c
23 * @brief helper library to manage identity tokens
24 * @author Martin Schanzenbach
27 #include "gnunet_util_lib.h"
28 #include "gnunet_signatures.h"
29 #include "identity_token.h"
35 #define JWT_ALG_VALUE "ED512"
39 #define JWT_TYP_VALUE "jwt"
42 * Crypto helper functions
46 create_sym_key_from_ecdh(const struct GNUNET_HashCode *new_key_hash,
47 struct GNUNET_CRYPTO_SymmetricSessionKey *skey,
48 struct GNUNET_CRYPTO_SymmetricInitializationVector *iv)
50 struct GNUNET_CRYPTO_HashAsciiEncoded new_key_hash_str;
52 GNUNET_CRYPTO_hash_to_enc (new_key_hash,
54 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Creating symmetric rsa key from %s\n", (char*)&new_key_hash_str);
55 static const char ctx_key[] = "gnuid-aes-ctx-key";
56 GNUNET_CRYPTO_kdf (skey, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
57 new_key_hash, sizeof (struct GNUNET_HashCode),
58 ctx_key, strlen (ctx_key),
60 static const char ctx_iv[] = "gnuid-aes-ctx-iv";
61 GNUNET_CRYPTO_kdf (iv, sizeof (struct GNUNET_CRYPTO_SymmetricInitializationVector),
62 new_key_hash, sizeof (struct GNUNET_HashCode),
63 ctx_iv, strlen (ctx_iv),
71 * Decrypts data part from a token code
74 decrypt_str_ecdhe (const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv_key,
75 const struct GNUNET_CRYPTO_EcdhePublicKey *ecdh_key,
76 const char *cyphertext,
77 size_t cyphertext_len,
80 struct GNUNET_HashCode new_key_hash;
81 struct GNUNET_CRYPTO_SymmetricSessionKey enc_key;
82 struct GNUNET_CRYPTO_SymmetricInitializationVector enc_iv;
84 char *str_buf = GNUNET_malloc (cyphertext_len);
87 //Calculate symmetric key from ecdh parameters
88 GNUNET_assert (GNUNET_OK == GNUNET_CRYPTO_ecdsa_ecdh (priv_key,
92 create_sym_key_from_ecdh (&new_key_hash,
96 str_size = GNUNET_CRYPTO_symmetric_decrypt (cyphertext,
101 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
102 "Decrypted bytes: %zd Expected bytes: %zd\n",
107 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "ECDH invalid\n");
108 GNUNET_free (str_buf);
109 return GNUNET_SYSERR;
111 *result_str = GNUNET_malloc (str_size+1);
112 memcpy (*result_str, str_buf, str_size);
113 (*result_str)[str_size] = '\0';
114 GNUNET_free (str_buf);
120 * Decrypt string using pubkey and ECDHE
123 decrypt_str_ecdhe2 (const struct GNUNET_CRYPTO_EcdhePrivateKey *ecdh_privkey,
124 const struct GNUNET_CRYPTO_EcdsaPublicKey *aud_key,
125 const char *ciphertext,
126 size_t ciphertext_len,
129 struct GNUNET_CRYPTO_SymmetricSessionKey skey;
130 struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
131 struct GNUNET_HashCode new_key_hash;
133 //This is true see documentation for GNUNET_CRYPTO_symmetric_encrypt
134 *plaintext = GNUNET_malloc (ciphertext_len);
136 // Derived key K = H(eB)
137 GNUNET_assert (GNUNET_OK == GNUNET_CRYPTO_ecdh_ecdsa (ecdh_privkey,
140 create_sym_key_from_ecdh(&new_key_hash, &skey, &iv);
141 GNUNET_CRYPTO_symmetric_decrypt (ciphertext,
150 * Encrypt string using pubkey and ECDHE
151 * Returns ECDHE pubkey to be used for decryption
154 encrypt_str_ecdhe (const char *plaintext,
155 const struct GNUNET_CRYPTO_EcdsaPublicKey *pub_key,
157 struct GNUNET_CRYPTO_EcdhePrivateKey **ecdh_privkey,
158 struct GNUNET_CRYPTO_EcdhePublicKey *ecdh_pubkey)
160 struct GNUNET_CRYPTO_SymmetricSessionKey skey;
161 struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
162 struct GNUNET_HashCode new_key_hash;
165 // ECDH keypair E = eG
166 *ecdh_privkey = GNUNET_CRYPTO_ecdhe_key_create();
167 GNUNET_CRYPTO_ecdhe_key_get_public (*ecdh_privkey,
170 //This is true see documentation for GNUNET_CRYPTO_symmetric_encrypt
171 *cyphertext = GNUNET_malloc (strlen (plaintext));
173 // Derived key K = H(eB)
174 GNUNET_assert (GNUNET_OK == GNUNET_CRYPTO_ecdh_ecdsa (*ecdh_privkey,
177 create_sym_key_from_ecdh(&new_key_hash, &skey, &iv);
178 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Encrypting string %s\n (len=%zd)",
181 enc_size = GNUNET_CRYPTO_symmetric_encrypt (plaintext,
185 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Encrypted (len=%zd)", enc_size);
196 * Create an Identity Token
198 * @param type the JSON API resource type
199 * @param id the JSON API resource id
200 * @return a new JSON API resource or NULL on error.
202 struct IdentityToken*
203 token_create (const struct GNUNET_CRYPTO_EcdsaPublicKey* iss,
204 const struct GNUNET_CRYPTO_EcdsaPublicKey* aud)
206 struct IdentityToken *token;
210 issuer = GNUNET_STRINGS_data_to_string_alloc (iss,
211 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey));
212 audience = GNUNET_STRINGS_data_to_string_alloc (aud,
213 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey));
215 token = GNUNET_malloc (sizeof (struct IdentityToken));
216 token_add_attr (token, "iss", issuer);
217 token_add_attr (token, "aud", audience);
218 token_add_attr (token, "sub", issuer);
219 token->aud_key = *aud;
220 GNUNET_free (issuer);
221 GNUNET_free (audience);
226 token_destroy (struct IdentityToken *token)
228 struct TokenAttr *attr;
229 struct TokenAttr *tmp_attr;
230 struct TokenAttrValue *val;
231 struct TokenAttrValue *tmp_val;
233 for (attr = token->attr_head; NULL != attr;)
235 tmp_attr = attr->next;
236 GNUNET_CONTAINER_DLL_remove (token->attr_head,
239 for (val = attr->val_head; NULL != val;)
242 GNUNET_CONTAINER_DLL_remove (attr->val_head,
245 if (NULL != val->value)
246 GNUNET_free (val->value);
250 GNUNET_free (attr->name);
260 token_add_attr (struct IdentityToken *token,
264 struct TokenAttr *attr;
265 struct TokenAttrValue *new_val;
266 GNUNET_assert (NULL != token);
268 new_val = GNUNET_malloc (sizeof (struct TokenAttrValue));
269 new_val->value = GNUNET_strdup (value);
270 for (attr = token->attr_head; NULL != attr; attr = attr->next)
272 if (0 == strcmp (key, attr->name))
278 attr = GNUNET_malloc (sizeof (struct TokenAttr));
279 attr->name = GNUNET_strdup (key);
280 GNUNET_CONTAINER_DLL_insert (token->attr_head,
285 GNUNET_CONTAINER_DLL_insert (attr->val_head,
291 token_add_attr_int (struct IdentityToken *token,
295 struct TokenAttr *attr;
296 struct TokenAttrValue *new_val;
297 GNUNET_assert (NULL != token);
299 new_val = GNUNET_malloc (sizeof (struct TokenAttrValue));
300 new_val->int_value = value;
301 for (attr = token->attr_head; NULL != attr; attr = attr->next)
303 if (0 == strcmp (key, attr->name))
309 attr = GNUNET_malloc (sizeof (struct TokenAttr));
310 attr->name = GNUNET_strdup (key);
311 GNUNET_CONTAINER_DLL_insert (token->attr_head,
316 GNUNET_CONTAINER_DLL_insert (attr->val_head,
322 parse_json_payload(const char* payload_base64,
323 struct IdentityToken *token)
327 const json_t *arr_value;
330 json_t *payload_json;
331 json_error_t err_json;
333 GNUNET_STRINGS_base64_decode (payload_base64,
334 strlen (payload_base64),
336 //TODO signature and aud key
337 payload_json = json_loads (payload, JSON_DECODE_ANY, &err_json);
339 json_object_foreach (payload_json, key, value)
341 if (json_is_array (value))
343 json_array_foreach (value, idx, arr_value)
345 if (json_is_integer (arr_value))
346 token_add_attr_int (token, key,
347 json_integer_value (arr_value));
349 token_add_attr (token,
351 json_string_value (arr_value));
354 if (json_is_integer (value))
355 token_add_attr_int (token, key,
356 json_integer_value (value));
358 token_add_attr (token, key, json_string_value (value));
362 json_decref (payload_json);
363 GNUNET_free (payload);
367 token_parse2 (const char* raw_data,
368 const struct GNUNET_CRYPTO_EcdhePrivateKey *priv_key,
369 const struct GNUNET_CRYPTO_EcdsaPublicKey *aud_key,
370 struct IdentityToken **result)
376 char *payload_base64;
377 size_t enc_token_len;
379 GNUNET_asprintf (&tmp_buf, "%s", raw_data);
380 strtok (tmp_buf, ",");
381 enc_token_str = strtok (NULL, ",");
383 enc_token_len = GNUNET_STRINGS_base64_decode (enc_token_str,
384 strlen (enc_token_str),
386 if (GNUNET_OK != decrypt_str_ecdhe2 (priv_key,
392 GNUNET_free (tmp_buf);
393 GNUNET_free (enc_token);
394 return GNUNET_SYSERR;
397 GNUNET_assert (NULL != strtok (token_str, "."));
398 payload_base64 = strtok (NULL, ".");
400 *result = GNUNET_malloc (sizeof (struct IdentityToken));
401 parse_json_payload (payload_base64, *result);
403 (*result)->aud_key = *aud_key;
404 GNUNET_free (enc_token);
405 GNUNET_free (token_str);
406 GNUNET_free (tmp_buf);
411 token_parse (const char* raw_data,
412 const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv_key,
413 struct IdentityToken **result)
415 char *ecdh_pubkey_str;
420 char *payload_base64;
421 size_t enc_token_len;
422 struct GNUNET_CRYPTO_EcdhePublicKey ecdh_pubkey;
424 GNUNET_asprintf (&tmp_buf, "%s", raw_data);
425 ecdh_pubkey_str = strtok (tmp_buf, ",");
426 enc_token_str = strtok (NULL, ",");
428 GNUNET_STRINGS_string_to_data (ecdh_pubkey_str,
429 strlen (ecdh_pubkey_str),
431 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey));
432 enc_token_len = GNUNET_STRINGS_base64_decode (enc_token_str,
433 strlen (enc_token_str),
435 if (GNUNET_OK != decrypt_str_ecdhe (priv_key,
441 GNUNET_free (tmp_buf);
442 GNUNET_free (enc_token);
443 return GNUNET_SYSERR;
446 GNUNET_assert (NULL != strtok (token_str, "."));
447 payload_base64 = strtok (NULL, ".");
449 *result = GNUNET_malloc (sizeof (struct IdentityToken));
450 parse_json_payload (payload_base64, *result);
452 GNUNET_free (enc_token);
453 GNUNET_free (token_str);
454 GNUNET_free (tmp_buf);
459 create_json_payload (const struct IdentityToken *token)
461 struct TokenAttr *attr;
462 struct TokenAttrValue *val;
466 root = json_object();
467 for (attr = token->attr_head; NULL != attr; attr = attr->next)
469 for (val = attr->val_head; NULL != val; val = val->next)
471 if (NULL != val->value)
473 json_object_set_new (root,
475 json_string (val->value));
477 json_object_set_new (root,
479 json_integer (val->int_value));
483 json_str = json_dumps (root, JSON_INDENT(1));
489 create_json_header(void)
494 root = json_object ();
495 json_object_set_new (root, JWT_ALG, json_string (JWT_ALG_VALUE));
496 json_object_set_new (root, JWT_TYP, json_string (JWT_TYP_VALUE));
498 json_str = json_dumps (root, JSON_INDENT(1));
504 token_to_string (const struct IdentityToken *token,
505 const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv_key,
510 char *payload_base64;
513 char *signature_target;
515 struct GNUNET_CRYPTO_EccSignaturePurpose *purpose;
516 header_str = create_json_header();
517 GNUNET_STRINGS_base64_encode (header_str,
520 //Remove GNUNET padding of base64
521 padding = strtok(header_base64, "=");
522 while (NULL != padding)
523 padding = strtok(NULL, "=");
525 payload_str = create_json_payload (token);
526 GNUNET_STRINGS_base64_encode (payload_str,
527 strlen (payload_str),
530 //Remove GNUNET padding of base64
531 padding = strtok(payload_base64, "=");
532 while (NULL != padding)
533 padding = strtok(NULL, "=");
535 GNUNET_asprintf (&signature_target, "%s,%s", header_base64, payload_base64);
537 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
538 strlen (signature_target));
540 htonl (strlen (signature_target) + sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose));
541 purpose->purpose = htonl(GNUNET_SIGNATURE_PURPOSE_GNUID_TOKEN);
542 memcpy (&purpose[1], signature_target, strlen (signature_target));
543 if (GNUNET_OK != GNUNET_CRYPTO_ecdsa_sign (priv_key,
545 (struct GNUNET_CRYPTO_EcdsaSignature *)&token->signature))
547 GNUNET_free (signature_target);
548 GNUNET_free (payload_str);
549 GNUNET_free (payload_base64);
550 GNUNET_free (purpose);
551 return GNUNET_SYSERR;
554 GNUNET_STRINGS_base64_encode ((const char*)&token->signature,
555 sizeof (struct GNUNET_CRYPTO_EcdsaSignature),
557 GNUNET_asprintf (result, "%s.%s.%s",
558 header_base64, payload_base64, signature_str);
559 GNUNET_free (signature_target);
560 GNUNET_free (payload_str);
561 GNUNET_free (header_str);
562 GNUNET_free (signature_str);
563 GNUNET_free (payload_base64);
564 GNUNET_free (header_base64);
565 GNUNET_free (purpose);
570 token_serialize (const struct IdentityToken *token,
571 const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv_key,
572 struct GNUNET_CRYPTO_EcdhePrivateKey **ecdh_privkey,
578 char *enc_token_base64;
579 struct GNUNET_CRYPTO_EcdhePublicKey ecdh_pubkey;
581 GNUNET_assert (GNUNET_OK == token_to_string (token,
585 GNUNET_assert (GNUNET_OK == encrypt_str_ecdhe (token_str,
590 GNUNET_STRINGS_base64_encode (enc_token,
593 dh_key_str = GNUNET_STRINGS_data_to_string_alloc (&ecdh_pubkey,
594 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey));
595 GNUNET_asprintf (result, "%s,%s", dh_key_str, enc_token_base64);
596 GNUNET_free (dh_key_str);
597 GNUNET_free (enc_token_base64);
598 GNUNET_free (enc_token);
599 GNUNET_free (token_str);
603 struct TokenTicketPayload*
604 ticket_payload_create (uint64_t nonce,
605 const struct GNUNET_CRYPTO_EcdsaPublicKey* identity_pkey,
608 struct TokenTicketPayload* payload;
610 payload = GNUNET_malloc (sizeof (struct TokenTicketPayload));
611 payload->nonce = nonce;
612 payload->identity_key = *identity_pkey;
613 GNUNET_asprintf (&payload->label, lbl_str, strlen (lbl_str));
618 ticket_payload_destroy (struct TokenTicketPayload* payload)
620 if (NULL != payload->label)
621 GNUNET_free (payload->label);
622 GNUNET_free (payload);
626 ticket_payload_serialize (struct TokenTicketPayload *payload,
629 char* identity_key_str;
631 identity_key_str = GNUNET_STRINGS_data_to_string_alloc (&payload->identity_key,
632 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey));
634 GNUNET_asprintf (result,
635 "{\"nonce\": \"%"SCNu64"\",\"identity\": \"%s\",\"label\": \"%s\"}",
636 payload->nonce, identity_key_str, payload->label);
637 GNUNET_free (identity_key_str);
643 * Create the token code
644 * The data is encrypted with a share ECDH derived secret using B (aud_key)
645 * and e (ecdh_privkey)
646 * The ticket also contains E (ecdh_pubkey) and a signature over the
650 ticket_create (uint64_t nonce,
651 const struct GNUNET_CRYPTO_EcdsaPublicKey* identity_pkey,
653 const struct GNUNET_CRYPTO_EcdsaPublicKey *aud_key)
655 struct TokenTicket *ticket;
656 struct TokenTicketPayload *code_payload;
658 ticket = GNUNET_malloc (sizeof (struct TokenTicket));
659 code_payload = ticket_payload_create (nonce,
662 ticket->aud_key = *aud_key;
663 ticket->payload = code_payload;
670 ticket_destroy (struct TokenTicket *ticket)
672 ticket_payload_destroy (ticket->payload);
673 GNUNET_free (ticket);
677 ticket_serialize (struct TokenTicket *ticket,
678 const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv_key,
681 char *code_payload_str;
682 char *enc_ticket_payload;
683 char *ticket_payload_str;
684 char *ticket_sig_str;
688 struct GNUNET_CRYPTO_EcdhePrivateKey *ecdhe_privkey;
690 struct GNUNET_CRYPTO_EccSignaturePurpose *purpose;
692 ticket_payload_serialize (ticket->payload,
695 GNUNET_assert (GNUNET_OK == encrypt_str_ecdhe (code_payload_str,
699 &ticket->ecdh_pubkey));
701 GNUNET_free (ecdhe_privkey);
704 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
705 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) + //E
706 strlen (code_payload_str)); // E_K (code_str)
708 htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
709 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) +
710 strlen (code_payload_str));
711 purpose->purpose = htonl(GNUNET_SIGNATURE_PURPOSE_GNUID_TICKET);
712 write_ptr = (char*) &purpose[1];
714 &ticket->ecdh_pubkey,
715 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey));
716 write_ptr += sizeof (struct GNUNET_CRYPTO_EcdhePublicKey);
717 memcpy (write_ptr, enc_ticket_payload, strlen (code_payload_str));
718 GNUNET_assert (GNUNET_OK == GNUNET_CRYPTO_ecdsa_sign (priv_key,
720 &ticket->signature));
721 GNUNET_STRINGS_base64_encode (enc_ticket_payload,
722 strlen (code_payload_str),
723 &ticket_payload_str);
724 ticket_sig_str = GNUNET_STRINGS_data_to_string_alloc (&ticket->signature,
725 sizeof (struct GNUNET_CRYPTO_EcdsaSignature));
727 dh_key_str = GNUNET_STRINGS_data_to_string_alloc (&ticket->ecdh_pubkey,
728 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey));
729 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Using ECDH pubkey %s to encrypt\n", dh_key_str);
730 GNUNET_asprintf (&ticket_str, "{\"data\": \"%s\", \"ecdh\": \"%s\", \"signature\": \"%s\"}",
731 ticket_payload_str, dh_key_str, ticket_sig_str);
732 GNUNET_STRINGS_base64_encode (ticket_str, strlen (ticket_str), result);
733 GNUNET_free (dh_key_str);
734 GNUNET_free (purpose);
735 GNUNET_free (ticket_str);
736 GNUNET_free (ticket_sig_str);
737 GNUNET_free (code_payload_str);
738 GNUNET_free (enc_ticket_payload);
739 GNUNET_free (ticket_payload_str);
744 ticket_payload_parse(const char *raw_data,
746 const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv_key,
747 const struct GNUNET_CRYPTO_EcdhePublicKey *ecdhe_pkey,
748 struct TokenTicketPayload **result)
750 const char* label_str;
751 const char* nonce_str;
752 const char* identity_key_str;
756 json_t *identity_json;
758 json_error_t err_json;
761 struct GNUNET_CRYPTO_EcdsaPublicKey id_pkey;
763 if (GNUNET_OK != decrypt_str_ecdhe (priv_key,
769 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Data decryption failed\n");
770 return GNUNET_SYSERR;
773 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Data: %s\n", data_str);
774 root = json_loads (data_str, JSON_DECODE_ANY, &err_json);
777 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
778 "Error parsing data: %s\n", err_json.text);
779 GNUNET_free (data_str);
780 return GNUNET_SYSERR;
783 identity_json = json_object_get (root, "identity");
784 if (!json_is_string (identity_json))
786 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
787 "Error parsing data: %s\n", err_json.text);
789 GNUNET_free (data_str);
790 return GNUNET_SYSERR;
792 identity_key_str = json_string_value (identity_json);
793 GNUNET_STRINGS_string_to_data (identity_key_str,
794 strlen (identity_key_str),
796 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey));
799 label_json = json_object_get (root, "label");
800 if (!json_is_string (label_json))
802 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
803 "Error parsing data: %s\n", err_json.text);
805 GNUNET_free (data_str);
806 return GNUNET_SYSERR;
809 label_str = json_string_value (label_json);
810 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Found label: %s\n", label_str);
812 nonce_json = json_object_get (root, "nonce");
813 if (!json_is_string (label_json))
815 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
816 "Error parsing data: %s\n", err_json.text);
818 GNUNET_free (data_str);
819 return GNUNET_SYSERR;
822 nonce_str = json_string_value (nonce_json);
823 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Found nonce: %s\n", nonce_str);
825 GNUNET_assert (0 != sscanf (nonce_str, "%"SCNu64, &nonce));
827 *result = ticket_payload_create (nonce,
828 (const struct GNUNET_CRYPTO_EcdsaPublicKey*)&id_pkey,
830 GNUNET_free (data_str);
837 ticket_parse (const char *raw_data,
838 const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv_key,
839 struct TokenTicket **result)
841 const char* enc_data_str;
842 const char* ecdh_enc_str;
843 const char* signature_enc_str;
846 json_t *signature_json;
848 json_t *enc_data_json;
849 json_error_t err_json;
851 char* ticket_decoded;
854 struct GNUNET_CRYPTO_EccSignaturePurpose *purpose;
855 struct TokenTicket *ticket;
856 struct TokenTicketPayload *ticket_payload;
858 ticket_decoded = NULL;
859 GNUNET_STRINGS_base64_decode (raw_data, strlen (raw_data), &ticket_decoded);
860 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Ticket: %s\n", ticket_decoded);
861 root = json_loads (ticket_decoded, JSON_DECODE_ANY, &err_json);
864 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
865 "%s\n", err_json.text);
866 return GNUNET_SYSERR;
869 signature_json = json_object_get (root, "signature");
870 ecdh_json = json_object_get (root, "ecdh");
871 enc_data_json = json_object_get (root, "data");
873 signature_enc_str = json_string_value (signature_json);
874 ecdh_enc_str = json_string_value (ecdh_json);
875 enc_data_str = json_string_value (enc_data_json);
877 ticket = GNUNET_malloc (sizeof (struct TokenTicket));
879 if (GNUNET_OK != GNUNET_STRINGS_string_to_data (ecdh_enc_str,
880 strlen (ecdh_enc_str),
881 &ticket->ecdh_pubkey,
882 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey)))
884 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "ECDH PKEY %s invalid in data\n", ecdh_enc_str);
886 GNUNET_free (ticket);
887 return GNUNET_SYSERR;
889 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Using ECDH pubkey %s for data decryption\n", ecdh_enc_str);
890 if (GNUNET_OK != GNUNET_STRINGS_string_to_data (signature_enc_str,
891 strlen (signature_enc_str),
893 sizeof (struct GNUNET_CRYPTO_EcdsaSignature)))
896 GNUNET_free (ticket_decoded);
897 GNUNET_free (ticket);
898 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "ECDH signature invalid in data\n");
899 return GNUNET_SYSERR;
902 enc_data_len = GNUNET_STRINGS_base64_decode (enc_data_str,
903 strlen (enc_data_str),
907 if (GNUNET_OK != ticket_payload_parse (enc_data,
910 (const struct GNUNET_CRYPTO_EcdhePublicKey*)&ticket->ecdh_pubkey,
914 GNUNET_free (enc_data);
915 GNUNET_free (ticket_decoded);
916 GNUNET_free (ticket);
917 return GNUNET_SYSERR;
920 ticket->payload = ticket_payload;
922 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
923 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) + //E
924 enc_data_len); // E_K (code_str)
926 htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
927 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) +
929 purpose->purpose = htonl(GNUNET_SIGNATURE_PURPOSE_GNUID_TICKET);
930 write_ptr = (char*) &purpose[1];
931 memcpy (write_ptr, &ticket->ecdh_pubkey, sizeof (struct GNUNET_CRYPTO_EcdhePublicKey));
932 write_ptr += sizeof (struct GNUNET_CRYPTO_EcdhePublicKey);
933 memcpy (write_ptr, enc_data, enc_data_len);
935 if (GNUNET_OK != GNUNET_CRYPTO_ecdsa_verify (GNUNET_SIGNATURE_PURPOSE_GNUID_TICKET,
938 &ticket_payload->identity_key))
940 ticket_destroy (ticket);
941 GNUNET_free (ticket_decoded);
943 GNUNET_free (purpose);
944 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
945 "Error verifying signature for ticket\n");
946 return GNUNET_SYSERR;
949 GNUNET_free (purpose);
951 GNUNET_free (enc_data);
952 GNUNET_free (ticket_decoded);
960 /* end of identity_token.c */