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-provider/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 GNUNET_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_assert (NULL != ecdh_pubkey_str);
429 GNUNET_assert (NULL != enc_token_str);
431 GNUNET_STRINGS_string_to_data (ecdh_pubkey_str,
432 strlen (ecdh_pubkey_str),
434 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey));
435 enc_token_len = GNUNET_STRINGS_base64_decode (enc_token_str,
436 strlen (enc_token_str),
438 if (GNUNET_OK != decrypt_str_ecdhe (priv_key,
444 GNUNET_free (tmp_buf);
445 GNUNET_free (enc_token);
446 return GNUNET_SYSERR;
449 GNUNET_assert (NULL != strtok (token_str, "."));
450 payload_base64 = strtok (NULL, ".");
452 *result = GNUNET_malloc (sizeof (struct IdentityToken));
453 parse_json_payload (payload_base64, *result);
455 GNUNET_free (enc_token);
456 GNUNET_free (token_str);
457 GNUNET_free (tmp_buf);
462 create_json_payload (const struct IdentityToken *token)
464 struct TokenAttr *attr;
465 struct TokenAttrValue *val;
469 root = json_object();
470 for (attr = token->attr_head; NULL != attr; attr = attr->next)
472 for (val = attr->val_head; NULL != val; val = val->next)
474 if (NULL != val->value)
476 json_object_set_new (root,
478 json_string (val->value));
480 json_object_set_new (root,
482 json_integer (val->int_value));
486 json_str = json_dumps (root, JSON_INDENT(1));
492 create_json_header(void)
497 root = json_object ();
498 json_object_set_new (root, JWT_ALG, json_string (JWT_ALG_VALUE));
499 json_object_set_new (root, JWT_TYP, json_string (JWT_TYP_VALUE));
501 json_str = json_dumps (root, JSON_INDENT(1));
507 token_to_string (const struct IdentityToken *token,
508 const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv_key,
513 char *payload_base64;
516 char *signature_target;
518 struct GNUNET_CRYPTO_EccSignaturePurpose *purpose;
519 header_str = create_json_header();
520 GNUNET_STRINGS_base64_encode (header_str,
523 //Remove GNUNET padding of base64
524 padding = strtok(header_base64, "=");
525 while (NULL != padding)
526 padding = strtok(NULL, "=");
528 payload_str = create_json_payload (token);
529 GNUNET_STRINGS_base64_encode (payload_str,
530 strlen (payload_str),
533 //Remove GNUNET padding of base64
534 padding = strtok(payload_base64, "=");
535 while (NULL != padding)
536 padding = strtok(NULL, "=");
538 GNUNET_asprintf (&signature_target, "%s,%s", header_base64, payload_base64);
540 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
541 strlen (signature_target));
543 htonl (strlen (signature_target) + sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose));
544 purpose->purpose = htonl(GNUNET_SIGNATURE_PURPOSE_GNUID_TOKEN);
545 GNUNET_memcpy (&purpose[1], signature_target, strlen (signature_target));
546 if (GNUNET_OK != GNUNET_CRYPTO_ecdsa_sign (priv_key,
548 (struct GNUNET_CRYPTO_EcdsaSignature *)&token->signature))
550 GNUNET_free (signature_target);
551 GNUNET_free (payload_str);
552 GNUNET_free (payload_base64);
553 GNUNET_free (header_base64);
554 GNUNET_free (purpose);
555 return GNUNET_SYSERR;
558 GNUNET_STRINGS_base64_encode ((const char*)&token->signature,
559 sizeof (struct GNUNET_CRYPTO_EcdsaSignature),
561 GNUNET_asprintf (result, "%s.%s.%s",
562 header_base64, payload_base64, signature_str);
563 GNUNET_free (signature_target);
564 GNUNET_free (payload_str);
565 GNUNET_free (header_str);
566 GNUNET_free (signature_str);
567 GNUNET_free (payload_base64);
568 GNUNET_free (header_base64);
569 GNUNET_free (purpose);
574 token_serialize (const struct IdentityToken *token,
575 const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv_key,
576 struct GNUNET_CRYPTO_EcdhePrivateKey **ecdh_privkey,
582 char *enc_token_base64;
583 struct GNUNET_CRYPTO_EcdhePublicKey ecdh_pubkey;
585 GNUNET_assert (GNUNET_OK == token_to_string (token,
589 GNUNET_assert (GNUNET_OK == encrypt_str_ecdhe (token_str,
594 GNUNET_STRINGS_base64_encode (enc_token,
597 dh_key_str = GNUNET_STRINGS_data_to_string_alloc (&ecdh_pubkey,
598 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey));
599 GNUNET_asprintf (result, "%s,%s", dh_key_str, enc_token_base64);
600 GNUNET_free (dh_key_str);
601 GNUNET_free (enc_token_base64);
602 GNUNET_free (enc_token);
603 GNUNET_free (token_str);
607 struct TokenTicketPayload*
608 ticket_payload_create (uint64_t nonce,
609 const struct GNUNET_CRYPTO_EcdsaPublicKey* identity_pkey,
612 struct TokenTicketPayload* payload;
614 payload = GNUNET_malloc (sizeof (struct TokenTicketPayload));
615 payload->nonce = nonce;
616 payload->identity_key = *identity_pkey;
617 GNUNET_asprintf (&payload->label, lbl_str, strlen (lbl_str));
622 ticket_payload_destroy (struct TokenTicketPayload* payload)
624 if (NULL != payload->label)
625 GNUNET_free (payload->label);
626 GNUNET_free (payload);
630 ticket_payload_serialize (struct TokenTicketPayload *payload,
633 char* identity_key_str;
635 identity_key_str = GNUNET_STRINGS_data_to_string_alloc (&payload->identity_key,
636 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey));
638 GNUNET_asprintf (result,
639 "{\"nonce\": \"%"SCNu64"\",\"identity\": \"%s\",\"label\": \"%s\"}",
640 payload->nonce, identity_key_str, payload->label);
641 GNUNET_free (identity_key_str);
647 * Create the token code
648 * The data is encrypted with a share ECDH derived secret using B (aud_key)
649 * and e (ecdh_privkey)
650 * The ticket also contains E (ecdh_pubkey) and a signature over the
654 ticket_create (uint64_t nonce,
655 const struct GNUNET_CRYPTO_EcdsaPublicKey* identity_pkey,
657 const struct GNUNET_CRYPTO_EcdsaPublicKey *aud_key)
659 struct TokenTicket *ticket;
660 struct TokenTicketPayload *code_payload;
662 ticket = GNUNET_malloc (sizeof (struct TokenTicket));
663 code_payload = ticket_payload_create (nonce,
666 ticket->aud_key = *aud_key;
667 ticket->payload = code_payload;
674 ticket_destroy (struct TokenTicket *ticket)
676 ticket_payload_destroy (ticket->payload);
677 GNUNET_free (ticket);
681 ticket_serialize (struct TokenTicket *ticket,
682 const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv_key,
685 char *code_payload_str;
686 char *enc_ticket_payload;
687 char *ticket_payload_str;
688 char *ticket_sig_str;
692 struct GNUNET_CRYPTO_EcdhePrivateKey *ecdhe_privkey;
694 struct GNUNET_CRYPTO_EccSignaturePurpose *purpose;
696 ticket_payload_serialize (ticket->payload,
699 GNUNET_assert (GNUNET_OK == encrypt_str_ecdhe (code_payload_str,
703 &ticket->ecdh_pubkey));
705 GNUNET_free (ecdhe_privkey);
708 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
709 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) + //E
710 strlen (code_payload_str)); // E_K (code_str)
712 htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
713 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) +
714 strlen (code_payload_str));
715 purpose->purpose = htonl(GNUNET_SIGNATURE_PURPOSE_GNUID_TICKET);
716 write_ptr = (char*) &purpose[1];
717 GNUNET_memcpy (write_ptr,
718 &ticket->ecdh_pubkey,
719 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey));
720 write_ptr += sizeof (struct GNUNET_CRYPTO_EcdhePublicKey);
721 GNUNET_memcpy (write_ptr, enc_ticket_payload, strlen (code_payload_str));
722 GNUNET_assert (GNUNET_OK == GNUNET_CRYPTO_ecdsa_sign (priv_key,
724 &ticket->signature));
725 GNUNET_STRINGS_base64_encode (enc_ticket_payload,
726 strlen (code_payload_str),
727 &ticket_payload_str);
728 ticket_sig_str = GNUNET_STRINGS_data_to_string_alloc (&ticket->signature,
729 sizeof (struct GNUNET_CRYPTO_EcdsaSignature));
731 dh_key_str = GNUNET_STRINGS_data_to_string_alloc (&ticket->ecdh_pubkey,
732 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey));
733 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Using ECDH pubkey %s to encrypt\n", dh_key_str);
734 GNUNET_asprintf (&ticket_str, "{\"data\": \"%s\", \"ecdh\": \"%s\", \"signature\": \"%s\"}",
735 ticket_payload_str, dh_key_str, ticket_sig_str);
736 GNUNET_STRINGS_base64_encode (ticket_str, strlen (ticket_str), result);
737 GNUNET_free (dh_key_str);
738 GNUNET_free (purpose);
739 GNUNET_free (ticket_str);
740 GNUNET_free (ticket_sig_str);
741 GNUNET_free (code_payload_str);
742 GNUNET_free (enc_ticket_payload);
743 GNUNET_free (ticket_payload_str);
748 ticket_payload_parse(const char *raw_data,
750 const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv_key,
751 const struct GNUNET_CRYPTO_EcdhePublicKey *ecdhe_pkey,
752 struct TokenTicketPayload **result)
754 const char* label_str;
755 const char* nonce_str;
756 const char* identity_key_str;
760 json_t *identity_json;
762 json_error_t err_json;
765 struct GNUNET_CRYPTO_EcdsaPublicKey id_pkey;
767 if (GNUNET_OK != decrypt_str_ecdhe (priv_key,
773 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Data decryption failed\n");
774 return GNUNET_SYSERR;
777 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Data: %s\n", data_str);
778 root = json_loads (data_str, JSON_DECODE_ANY, &err_json);
781 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
782 "Error parsing data: %s\n", err_json.text);
783 GNUNET_free (data_str);
784 return GNUNET_SYSERR;
787 identity_json = json_object_get (root, "identity");
788 if (!json_is_string (identity_json))
790 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
791 "Error parsing data: %s\n", err_json.text);
793 GNUNET_free (data_str);
794 return GNUNET_SYSERR;
796 identity_key_str = json_string_value (identity_json);
797 GNUNET_STRINGS_string_to_data (identity_key_str,
798 strlen (identity_key_str),
800 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey));
803 label_json = json_object_get (root, "label");
804 if (!json_is_string (label_json))
806 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
807 "Error parsing data: %s\n", err_json.text);
809 GNUNET_free (data_str);
810 return GNUNET_SYSERR;
813 label_str = json_string_value (label_json);
814 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Found label: %s\n", label_str);
816 nonce_json = json_object_get (root, "nonce");
817 if (!json_is_string (label_json))
819 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
820 "Error parsing data: %s\n", err_json.text);
822 GNUNET_free (data_str);
823 return GNUNET_SYSERR;
826 nonce_str = json_string_value (nonce_json);
827 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Found nonce: %s\n", nonce_str);
829 GNUNET_assert (0 != sscanf (nonce_str, "%"SCNu64, &nonce));
831 *result = ticket_payload_create (nonce,
832 (const struct GNUNET_CRYPTO_EcdsaPublicKey*)&id_pkey,
834 GNUNET_free (data_str);
841 ticket_parse (const char *raw_data,
842 const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv_key,
843 struct TokenTicket **result)
845 const char* enc_data_str;
846 const char* ecdh_enc_str;
847 const char* signature_enc_str;
850 json_t *signature_json;
852 json_t *enc_data_json;
853 json_error_t err_json;
855 char* ticket_decoded;
858 struct GNUNET_CRYPTO_EccSignaturePurpose *purpose;
859 struct TokenTicket *ticket;
860 struct TokenTicketPayload *ticket_payload;
862 ticket_decoded = NULL;
863 GNUNET_STRINGS_base64_decode (raw_data, strlen (raw_data), &ticket_decoded);
864 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Ticket: %s\n", ticket_decoded);
865 root = json_loads (ticket_decoded, JSON_DECODE_ANY, &err_json);
868 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
869 "%s\n", err_json.text);
870 return GNUNET_SYSERR;
873 signature_json = json_object_get (root, "signature");
874 ecdh_json = json_object_get (root, "ecdh");
875 enc_data_json = json_object_get (root, "data");
877 signature_enc_str = json_string_value (signature_json);
878 ecdh_enc_str = json_string_value (ecdh_json);
879 enc_data_str = json_string_value (enc_data_json);
881 ticket = GNUNET_malloc (sizeof (struct TokenTicket));
883 if (GNUNET_OK != GNUNET_STRINGS_string_to_data (ecdh_enc_str,
884 strlen (ecdh_enc_str),
885 &ticket->ecdh_pubkey,
886 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey)))
888 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "ECDH PKEY %s invalid in data\n", ecdh_enc_str);
890 GNUNET_free (ticket);
891 return GNUNET_SYSERR;
893 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Using ECDH pubkey %s for data decryption\n", ecdh_enc_str);
894 if (GNUNET_OK != GNUNET_STRINGS_string_to_data (signature_enc_str,
895 strlen (signature_enc_str),
897 sizeof (struct GNUNET_CRYPTO_EcdsaSignature)))
900 GNUNET_free (ticket_decoded);
901 GNUNET_free (ticket);
902 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "ECDH signature invalid in data\n");
903 return GNUNET_SYSERR;
906 enc_data_len = GNUNET_STRINGS_base64_decode (enc_data_str,
907 strlen (enc_data_str),
911 if (GNUNET_OK != ticket_payload_parse (enc_data,
914 (const struct GNUNET_CRYPTO_EcdhePublicKey*)&ticket->ecdh_pubkey,
918 GNUNET_free (enc_data);
919 GNUNET_free (ticket_decoded);
920 GNUNET_free (ticket);
921 return GNUNET_SYSERR;
924 ticket->payload = ticket_payload;
926 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
927 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) + //E
928 enc_data_len); // E_K (code_str)
930 htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
931 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) +
933 purpose->purpose = htonl(GNUNET_SIGNATURE_PURPOSE_GNUID_TICKET);
934 write_ptr = (char*) &purpose[1];
935 GNUNET_memcpy (write_ptr, &ticket->ecdh_pubkey, sizeof (struct GNUNET_CRYPTO_EcdhePublicKey));
936 write_ptr += sizeof (struct GNUNET_CRYPTO_EcdhePublicKey);
937 GNUNET_memcpy (write_ptr, enc_data, enc_data_len);
939 if (GNUNET_OK != GNUNET_CRYPTO_ecdsa_verify (GNUNET_SIGNATURE_PURPOSE_GNUID_TICKET,
942 &ticket_payload->identity_key))
944 ticket_destroy (ticket);
945 GNUNET_free (ticket_decoded);
947 GNUNET_free (purpose);
948 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
949 "Error verifying signature for ticket\n");
950 return GNUNET_SYSERR;
953 GNUNET_free (purpose);
955 GNUNET_free (enc_data);
956 GNUNET_free (ticket_decoded);
964 /* end of identity_token.c */