2 This file is part of GNUnet
3 Copyright (C) 2010-2015 Christian Grothoff (and other contributing authors)
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"
34 #define JWT_ALG_VALUE "ED512"
38 #define JWT_TYP_VALUE "jwt"
41 * Crypto helper functions
45 create_sym_key_from_ecdh(const struct GNUNET_HashCode *new_key_hash,
46 struct GNUNET_CRYPTO_SymmetricSessionKey *skey,
47 struct GNUNET_CRYPTO_SymmetricInitializationVector *iv)
49 struct GNUNET_CRYPTO_HashAsciiEncoded new_key_hash_str;
51 GNUNET_CRYPTO_hash_to_enc (new_key_hash,
53 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Creating symmetric rsa key from %s\n", (char*)&new_key_hash_str);
54 static const char ctx_key[] = "gnuid-aes-ctx-key";
55 GNUNET_CRYPTO_kdf (skey, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
56 new_key_hash, sizeof (struct GNUNET_HashCode),
57 ctx_key, strlen (ctx_key),
59 static const char ctx_iv[] = "gnuid-aes-ctx-iv";
60 GNUNET_CRYPTO_kdf (iv, sizeof (struct GNUNET_CRYPTO_SymmetricInitializationVector),
61 new_key_hash, sizeof (struct GNUNET_HashCode),
62 ctx_iv, strlen (ctx_iv),
70 * Decrypts metainfo part from a token code
73 decrypt_str_ecdhe (const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv_key,
74 const struct GNUNET_CRYPTO_EcdhePublicKey *ecdh_key,
75 const char *cyphertext,
76 size_t cyphertext_len,
79 struct GNUNET_HashCode new_key_hash;
80 struct GNUNET_CRYPTO_SymmetricSessionKey enc_key;
81 struct GNUNET_CRYPTO_SymmetricInitializationVector enc_iv;
83 char *str_buf = GNUNET_malloc (cyphertext_len);
86 //Calculate symmetric key from ecdh parameters
87 GNUNET_assert (GNUNET_OK == GNUNET_CRYPTO_ecdsa_ecdh (priv_key,
91 create_sym_key_from_ecdh (&new_key_hash,
95 str_size = GNUNET_CRYPTO_symmetric_decrypt (cyphertext,
100 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Decrypted bytes: %d Expected bytes: %d\n", str_size, cyphertext_len);
103 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "ECDH invalid\n");
104 GNUNET_free (str_buf);
105 return GNUNET_SYSERR;
107 *result_str = GNUNET_malloc (str_size+1);
108 memcpy (*result_str, str_buf, str_size);
109 (*result_str)[str_size] = '\0';
110 GNUNET_free (str_buf);
116 * Decrypt string using pubkey and ECDHE
119 decrypt_str_ecdhe2 (const struct GNUNET_CRYPTO_EcdhePrivateKey *ecdh_privkey,
120 const struct GNUNET_CRYPTO_EcdsaPublicKey *aud_key,
121 const char *ciphertext,
122 size_t ciphertext_len,
125 struct GNUNET_CRYPTO_SymmetricSessionKey skey;
126 struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
127 struct GNUNET_HashCode new_key_hash;
129 //This is true see documentation for GNUNET_CRYPTO_symmetric_encrypt
130 *plaintext = GNUNET_malloc (ciphertext_len);
132 // Derived key K = H(eB)
133 GNUNET_assert (GNUNET_OK == GNUNET_CRYPTO_ecdh_ecdsa (ecdh_privkey,
136 create_sym_key_from_ecdh(&new_key_hash, &skey, &iv);
137 GNUNET_CRYPTO_symmetric_decrypt (ciphertext,
146 * Encrypt string using pubkey and ECDHE
147 * Returns ECDHE pubkey to be used for decryption
150 encrypt_str_ecdhe (const char *plaintext,
151 const struct GNUNET_CRYPTO_EcdsaPublicKey *pub_key,
153 struct GNUNET_CRYPTO_EcdhePrivateKey **ecdh_privkey,
154 struct GNUNET_CRYPTO_EcdhePublicKey *ecdh_pubkey)
156 struct GNUNET_CRYPTO_SymmetricSessionKey skey;
157 struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
158 struct GNUNET_HashCode new_key_hash;
161 // ECDH keypair E = eG
162 *ecdh_privkey = GNUNET_CRYPTO_ecdhe_key_create();
163 GNUNET_CRYPTO_ecdhe_key_get_public (*ecdh_privkey,
166 //This is true see documentation for GNUNET_CRYPTO_symmetric_encrypt
167 *cyphertext = GNUNET_malloc (strlen (plaintext));
169 // Derived key K = H(eB)
170 GNUNET_assert (GNUNET_OK == GNUNET_CRYPTO_ecdh_ecdsa (*ecdh_privkey,
173 create_sym_key_from_ecdh(&new_key_hash, &skey, &iv);
174 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Encrypting string %s\n (len=%d)",
177 enc_size = GNUNET_CRYPTO_symmetric_encrypt (plaintext,
181 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Encrypted (len=%d)", enc_size);
192 * Create an Identity Token
194 * @param type the JSON API resource type
195 * @param id the JSON API resource id
196 * @return a new JSON API resource or NULL on error.
198 struct IdentityToken*
199 token_create (const struct GNUNET_CRYPTO_EcdsaPublicKey* iss,
200 const struct GNUNET_CRYPTO_EcdsaPublicKey* aud)
202 struct IdentityToken *token;
206 issuer = GNUNET_STRINGS_data_to_string_alloc (iss,
207 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey));
208 audience = GNUNET_STRINGS_data_to_string_alloc (aud,
209 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey));
211 token = GNUNET_malloc (sizeof (struct IdentityToken));
212 token_add_attr (token, "iss", issuer);
213 token_add_attr (token, "aud", audience);
214 token_add_attr (token, "sub", issuer);
215 token->aud_key = *aud;
216 GNUNET_free (issuer);
217 GNUNET_free (audience);
222 token_destroy (struct IdentityToken *token)
224 struct TokenAttr *attr;
225 struct TokenAttr *tmp_attr;
226 struct TokenAttrValue *val;
227 struct TokenAttrValue *tmp_val;
229 for (attr = token->attr_head; NULL != attr;)
231 tmp_attr = attr->next;
232 GNUNET_CONTAINER_DLL_remove (token->attr_head,
235 for (val = attr->val_head; NULL != val;)
238 GNUNET_CONTAINER_DLL_remove (attr->val_head,
241 GNUNET_free (val->value);
245 GNUNET_free (attr->name);
255 token_add_attr (struct IdentityToken *token,
259 struct TokenAttr *attr;
260 struct TokenAttrValue *new_val;
261 GNUNET_assert (NULL != token);
263 new_val = GNUNET_malloc (sizeof (struct TokenAttrValue));
264 new_val->value = GNUNET_strdup (value);
265 for (attr = token->attr_head; NULL != attr; attr = attr->next)
267 if (0 == strcmp (key, attr->name))
273 attr = GNUNET_malloc (sizeof (struct TokenAttr));
274 attr->name = GNUNET_strdup (key);
275 GNUNET_CONTAINER_DLL_insert (token->attr_head,
280 GNUNET_CONTAINER_DLL_insert (attr->val_head,
286 parse_json_payload(const char* payload_base64,
287 struct IdentityToken *token)
291 const json_t *arr_value;
294 json_t *payload_json;
295 json_error_t err_json;
297 GNUNET_STRINGS_base64_decode (payload_base64,
298 strlen (payload_base64),
300 //TODO signature and aud key
301 payload_json = json_loads (payload, JSON_DECODE_ANY, &err_json);
303 json_object_foreach (payload_json, key, value)
305 if (json_is_array (value))
307 json_array_foreach (value, idx, arr_value)
309 token_add_attr (token,
311 json_string_value (arr_value));
314 token_add_attr (token, key, json_string_value (value));
318 GNUNET_free (payload);
322 token_parse2 (const char* raw_data,
323 const struct GNUNET_CRYPTO_EcdhePrivateKey *priv_key,
324 const struct GNUNET_CRYPTO_EcdsaPublicKey *aud_key,
325 struct IdentityToken **result)
331 char *payload_base64;
332 size_t enc_token_len;
334 GNUNET_asprintf (&tmp_buf, "%s", raw_data);
335 strtok (tmp_buf, ",");
336 enc_token_str = strtok (NULL, ",");
338 enc_token_len = GNUNET_STRINGS_base64_decode (enc_token_str,
339 strlen (enc_token_str),
341 if (GNUNET_OK != decrypt_str_ecdhe2 (priv_key,
347 GNUNET_free (tmp_buf);
348 GNUNET_free (enc_token);
349 return GNUNET_SYSERR;
352 GNUNET_assert (NULL != strtok (token_str, "."));
353 payload_base64 = strtok (NULL, ".");
355 *result = GNUNET_malloc (sizeof (struct IdentityToken));
356 parse_json_payload (payload_base64, *result);
358 (*result)->aud_key = *aud_key;
359 GNUNET_free (enc_token);
360 GNUNET_free (token_str);
361 GNUNET_free (tmp_buf);
366 token_parse (const char* raw_data,
367 const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv_key,
368 struct IdentityToken **result)
370 char *ecdh_pubkey_str;
375 char *payload_base64;
376 size_t enc_token_len;
377 struct GNUNET_CRYPTO_EcdhePublicKey ecdh_pubkey;
379 GNUNET_asprintf (&tmp_buf, "%s", raw_data);
380 ecdh_pubkey_str = strtok (tmp_buf, ",");
381 enc_token_str = strtok (NULL, ",");
383 GNUNET_STRINGS_string_to_data (ecdh_pubkey_str,
384 strlen (ecdh_pubkey_str),
386 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey));
387 enc_token_len = GNUNET_STRINGS_base64_decode (enc_token_str,
388 strlen (enc_token_str),
390 if (GNUNET_OK != decrypt_str_ecdhe (priv_key,
396 GNUNET_free (tmp_buf);
397 GNUNET_free (enc_token);
398 return GNUNET_SYSERR;
401 GNUNET_assert (NULL != strtok (token_str, "."));
402 payload_base64 = strtok (NULL, ".");
404 *result = GNUNET_malloc (sizeof (struct IdentityToken));
405 parse_json_payload (payload_base64, *result);
407 GNUNET_free (enc_token);
408 GNUNET_free (token_str);
409 GNUNET_free (tmp_buf);
414 create_json_payload (const struct IdentityToken *token)
416 struct TokenAttr *attr;
417 struct TokenAttrValue *val;
421 root = json_object();
422 for (attr = token->attr_head; NULL != attr; attr = attr->next)
424 for (val = attr->val_head; NULL != val; val = val->next)
426 json_object_set_new (root,
428 json_string (val->value));
431 json_str = json_dumps (root, JSON_INDENT(1));
437 create_json_header(void)
442 root = json_object ();
443 json_object_set_new (root, JWT_ALG, json_string (JWT_ALG_VALUE));
444 json_object_set_new (root, JWT_TYP, json_string (JWT_TYP_VALUE));
446 json_str = json_dumps (root, JSON_INDENT(1));
452 token_to_string (const struct IdentityToken *token,
453 const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv_key,
458 char *payload_base64;
461 char *signature_target;
463 struct GNUNET_CRYPTO_EccSignaturePurpose *purpose;
464 header_str = create_json_header();
465 GNUNET_STRINGS_base64_encode (header_str,
468 //Remove GNUNET padding of base64
469 padding = strtok(header_base64, "=");
470 while (NULL != padding)
471 padding = strtok(NULL, "=");
473 payload_str = create_json_payload (token);
474 GNUNET_STRINGS_base64_encode (payload_str,
475 strlen (payload_str),
478 //Remove GNUNET padding of base64
479 padding = strtok(payload_base64, "=");
480 while (NULL != padding)
481 padding = strtok(NULL, "=");
483 GNUNET_asprintf (&signature_target, "%s,%s", header_base64, payload_base64);
485 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
486 strlen (signature_target));
488 htonl (strlen (signature_target) + sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose));
489 purpose->purpose = htonl(GNUNET_SIGNATURE_PURPOSE_GNUID_TOKEN);
490 memcpy (&purpose[1], signature_target, strlen (signature_target));
491 if (GNUNET_OK != GNUNET_CRYPTO_ecdsa_sign (priv_key,
493 (struct GNUNET_CRYPTO_EcdsaSignature *)&token->signature))
495 GNUNET_free (signature_target);
496 GNUNET_free (payload_str);
497 GNUNET_free (payload_base64);
498 GNUNET_free (purpose);
499 return GNUNET_SYSERR;
502 GNUNET_STRINGS_base64_encode ((const char*)&token->signature,
503 sizeof (struct GNUNET_CRYPTO_EcdsaSignature),
505 GNUNET_asprintf (result, "%s.%s.%s",
506 header_base64, payload_base64, signature_str);
507 GNUNET_free (signature_target);
508 GNUNET_free (payload_str);
509 GNUNET_free (header_str);
510 GNUNET_free (signature_str);
511 GNUNET_free (payload_base64);
512 GNUNET_free (header_base64);
513 GNUNET_free (purpose);
518 token_serialize (const struct IdentityToken *token,
519 const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv_key,
520 struct GNUNET_CRYPTO_EcdhePrivateKey **ecdh_privkey,
526 char *enc_token_base64;
527 struct GNUNET_CRYPTO_EcdhePublicKey ecdh_pubkey;
529 GNUNET_assert (GNUNET_OK == token_to_string (token,
533 GNUNET_assert (GNUNET_OK == encrypt_str_ecdhe (token_str,
538 GNUNET_STRINGS_base64_encode (enc_token,
541 dh_key_str = GNUNET_STRINGS_data_to_string_alloc (&ecdh_pubkey,
542 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey));
543 GNUNET_asprintf (result, "%s,%s", dh_key_str, enc_token_base64);
544 GNUNET_free (dh_key_str);
545 GNUNET_free (enc_token_base64);
546 GNUNET_free (enc_token);
547 GNUNET_free (token_str);
551 struct TokenTicketPayload*
552 ticket_payload_create (const char* nonce,
553 const struct GNUNET_CRYPTO_EcdsaPublicKey* identity_pkey,
556 struct TokenTicketPayload* payload;
558 payload = GNUNET_malloc (sizeof (struct TokenTicketPayload));
559 GNUNET_asprintf (&payload->nonce, nonce, strlen (nonce));
560 payload->identity_key = *identity_pkey;
561 GNUNET_asprintf (&payload->label, lbl_str, strlen (lbl_str));
566 ticket_payload_destroy (struct TokenTicketPayload* payload)
568 if (NULL != payload->nonce)
569 GNUNET_free (payload->nonce);
570 if (NULL != payload->label)
571 GNUNET_free (payload->label);
572 GNUNET_free (payload);
576 ticket_payload_serialize (struct TokenTicketPayload *payload,
579 char* identity_key_str;
581 identity_key_str = GNUNET_STRINGS_data_to_string_alloc (&payload->identity_key,
582 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey));
584 GNUNET_asprintf (result,
585 "{\"nonce\": \"%u\",\"identity\": \"%s\",\"label\": \"%s\"}",
586 payload->nonce, identity_key_str, payload->label);
587 GNUNET_free (identity_key_str);
593 * Create the token code
594 * The metadata is encrypted with a share ECDH derived secret using B (aud_key)
595 * and e (ecdh_privkey)
596 * The ticket also contains E (ecdh_pubkey) and a signature over the
600 ticket_create (const char* nonce_str,
601 const struct GNUNET_CRYPTO_EcdsaPublicKey* identity_pkey,
603 const struct GNUNET_CRYPTO_EcdsaPublicKey *aud_key)
605 struct TokenTicket *ticket;
606 struct TokenTicketPayload *code_payload;
608 ticket = GNUNET_malloc (sizeof (struct TokenTicket));
609 code_payload = ticket_payload_create (nonce_str,
612 ticket->aud_key = *aud_key;
613 ticket->payload = code_payload;
620 ticket_destroy (struct TokenTicket *ticket)
622 ticket_payload_destroy (ticket->payload);
623 GNUNET_free (ticket);
627 ticket_serialize (struct TokenTicket *ticket,
628 const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv_key,
631 char *code_payload_str;
632 char *enc_ticket_payload;
633 char *ticket_payload_str;
634 char *ticket_sig_str;
638 struct GNUNET_CRYPTO_EcdhePrivateKey *ecdhe_privkey;
640 struct GNUNET_CRYPTO_EccSignaturePurpose *purpose;
642 ticket_payload_serialize (ticket->payload,
645 GNUNET_assert (GNUNET_OK == encrypt_str_ecdhe (code_payload_str,
649 &ticket->ecdh_pubkey));
651 GNUNET_free (ecdhe_privkey);
654 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
655 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) + //E
656 strlen (code_payload_str)); // E_K (code_str)
658 htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
659 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) +
660 strlen (code_payload_str));
661 purpose->purpose = htonl(GNUNET_SIGNATURE_PURPOSE_GNUID_TICKET);
662 write_ptr = (char*) &purpose[1];
664 &ticket->ecdh_pubkey,
665 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey));
666 write_ptr += sizeof (struct GNUNET_CRYPTO_EcdhePublicKey);
667 memcpy (write_ptr, enc_ticket_payload, strlen (code_payload_str));
668 GNUNET_assert (GNUNET_OK == GNUNET_CRYPTO_ecdsa_sign (priv_key,
670 &ticket->signature));
671 GNUNET_STRINGS_base64_encode (enc_ticket_payload,
672 strlen (code_payload_str),
673 &ticket_payload_str);
674 ticket_sig_str = GNUNET_STRINGS_data_to_string_alloc (&ticket->signature,
675 sizeof (struct GNUNET_CRYPTO_EcdsaSignature));
677 dh_key_str = GNUNET_STRINGS_data_to_string_alloc (&ticket->ecdh_pubkey,
678 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey));
679 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Using ECDH pubkey %s to encrypt\n", dh_key_str);
680 GNUNET_asprintf (&ticket_str, "{\"meta\": \"%s\", \"ecdh\": \"%s\", \"signature\": \"%s\"}",
681 ticket_payload_str, dh_key_str, ticket_sig_str);
682 GNUNET_STRINGS_base64_encode (ticket_str, strlen (ticket_str), result);
683 GNUNET_free (dh_key_str);
684 GNUNET_free (purpose);
685 GNUNET_free (ticket_str);
686 GNUNET_free (ticket_sig_str);
687 GNUNET_free (code_payload_str);
688 GNUNET_free (enc_ticket_payload);
689 GNUNET_free (ticket_payload_str);
694 ticket_payload_parse(const char *raw_data,
696 const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv_key,
697 const struct GNUNET_CRYPTO_EcdhePublicKey *ecdhe_pkey,
698 struct TokenTicketPayload **result)
700 const char* label_str;
701 const char* nonce_str;
702 const char* identity_key_str;
706 json_t *identity_json;
708 json_error_t err_json;
710 struct GNUNET_CRYPTO_EcdsaPublicKey id_pkey;
712 if (GNUNET_OK != decrypt_str_ecdhe (priv_key,
718 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Metadata decryption failed\n");
719 return GNUNET_SYSERR;
722 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Metadata: %s\n", meta_str);
723 root = json_loads (meta_str, JSON_DECODE_ANY, &err_json);
726 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
727 "Error parsing metadata: %s\n", err_json.text);
728 GNUNET_free (meta_str);
729 return GNUNET_SYSERR;
732 identity_json = json_object_get (root, "identity");
733 if (!json_is_string (identity_json))
735 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
736 "Error parsing metadata: %s\n", err_json.text);
738 GNUNET_free (meta_str);
739 return GNUNET_SYSERR;
741 identity_key_str = json_string_value (identity_json);
742 GNUNET_STRINGS_string_to_data (identity_key_str,
743 strlen (identity_key_str),
745 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey));
748 label_json = json_object_get (root, "label");
749 if (!json_is_string (label_json))
751 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
752 "Error parsing metadata: %s\n", err_json.text);
754 GNUNET_free (meta_str);
755 return GNUNET_SYSERR;
758 label_str = json_string_value (label_json);
759 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Found label: %s\n", label_str);
761 nonce_json = json_object_get (root, "nonce");
762 if (!json_is_string (label_json))
764 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
765 "Error parsing metadata: %s\n", err_json.text);
767 GNUNET_free (meta_str);
768 return GNUNET_SYSERR;
771 nonce_str = json_string_value (nonce_json);
772 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Found nonce: %s\n", nonce_str);
774 *result = ticket_payload_create (nonce_str,
775 (const struct GNUNET_CRYPTO_EcdsaPublicKey*)&id_pkey,
777 GNUNET_free (meta_str);
784 ticket_parse (const char *raw_data,
785 const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv_key,
786 struct TokenTicket **result)
788 const char* enc_meta_str;
789 const char* ecdh_enc_str;
790 const char* signature_enc_str;
793 json_t *signature_json;
795 json_t *enc_meta_json;
796 json_error_t err_json;
798 char* ticket_decoded;
801 struct GNUNET_CRYPTO_EccSignaturePurpose *purpose;
802 struct TokenTicket *ticket;
803 struct TokenTicketPayload *ticket_payload;
805 ticket_decoded = NULL;
806 GNUNET_STRINGS_base64_decode (raw_data, strlen (raw_data), &ticket_decoded);
807 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Token Code: %s\n", ticket_decoded);
808 root = json_loads (ticket_decoded, JSON_DECODE_ANY, &err_json);
811 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
812 "%s\n", err_json.text);
813 return GNUNET_SYSERR;
816 signature_json = json_object_get (root, "signature");
817 ecdh_json = json_object_get (root, "ecdh");
818 enc_meta_json = json_object_get (root, "meta");
820 signature_enc_str = json_string_value (signature_json);
821 ecdh_enc_str = json_string_value (ecdh_json);
822 enc_meta_str = json_string_value (enc_meta_json);
824 ticket = GNUNET_malloc (sizeof (struct TokenTicket));
826 if (GNUNET_OK != GNUNET_STRINGS_string_to_data (ecdh_enc_str,
827 strlen (ecdh_enc_str),
828 &ticket->ecdh_pubkey,
829 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey)))
831 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "ECDH PKEY %s invalid in metadata\n", ecdh_enc_str);
833 GNUNET_free (ticket);
834 return GNUNET_SYSERR;
836 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Using ECDH pubkey %s for metadata decryption\n", ecdh_enc_str);
837 if (GNUNET_OK != GNUNET_STRINGS_string_to_data (signature_enc_str,
838 strlen (signature_enc_str),
840 sizeof (struct GNUNET_CRYPTO_EcdsaSignature)))
843 GNUNET_free (ticket_decoded);
844 GNUNET_free (ticket);
845 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "ECDH signature invalid in metadata\n");
846 return GNUNET_SYSERR;
849 enc_meta_len = GNUNET_STRINGS_base64_decode (enc_meta_str,
850 strlen (enc_meta_str),
854 if (GNUNET_OK != ticket_payload_parse (enc_meta,
857 (const struct GNUNET_CRYPTO_EcdhePublicKey*)&ticket->ecdh_pubkey,
861 GNUNET_free (enc_meta);
862 GNUNET_free (ticket_decoded);
863 GNUNET_free (ticket);
864 return GNUNET_SYSERR;
867 ticket->payload = ticket_payload;
868 //TODO: check signature here
870 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
871 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) + //E
872 enc_meta_len); // E_K (code_str)
874 htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
875 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) +
877 purpose->purpose = htonl(GNUNET_SIGNATURE_PURPOSE_GNUID_TICKET);
878 write_ptr = (char*) &purpose[1];
879 memcpy (write_ptr, &ticket->ecdh_pubkey, sizeof (struct GNUNET_CRYPTO_EcdhePublicKey));
880 write_ptr += sizeof (struct GNUNET_CRYPTO_EcdhePublicKey);
881 memcpy (write_ptr, enc_meta, enc_meta_len);
883 if (GNUNET_OK != GNUNET_CRYPTO_ecdsa_verify (GNUNET_SIGNATURE_PURPOSE_GNUID_TICKET,
886 &ticket_payload->identity_key))
888 ticket_destroy (ticket);
889 GNUNET_free (ticket_decoded);
891 GNUNET_free (purpose);
892 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
893 "Error verifying signature for token code\n");
894 return GNUNET_SYSERR;
897 GNUNET_free (purpose);
899 GNUNET_free (enc_meta);
900 GNUNET_free (ticket_decoded);
908 /* end of identity_token.c */