Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2025 Taler Systems SA
4 :
5 : TALER is free software; you can redistribute it and/or modify it under the
6 : terms of the GNU General Public License as published by the Free Software
7 : Foundation; either version 3, or (at your option) any later version.
8 :
9 : TALER is distributed in the hope that it will be useful, but WITHOUT ANY
10 : WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11 : A PARTICULAR PURPOSE. See the GNU General Public License for more details.
12 :
13 : You should have received a copy of the GNU General Public License along with
14 : TALER; see the file COPYING. If not, see
15 : <http://www.gnu.org/licenses/>
16 : */
17 : /**
18 : * @file lib/exchange_api_melt.c
19 : * @brief Implementation of the /melt request
20 : * @author Özgür Kesim
21 : */
22 : #include "taler/platform.h"
23 : #include <jansson.h>
24 : #include <microhttpd.h> /* just for HTTP status codes */
25 : #include <gnunet/gnunet_util_lib.h>
26 : #include <gnunet/gnunet_json_lib.h>
27 : #include <gnunet/gnunet_curl_lib.h>
28 : #include "taler/taler_json_lib.h"
29 : #include "taler/taler_exchange_service.h"
30 : #include "exchange_api_common.h"
31 : #include "exchange_api_handle.h"
32 : #include "taler/taler_signatures.h"
33 : #include "exchange_api_curl_defaults.h"
34 : #include "exchange_api_refresh_common.h"
35 :
36 :
37 : /**
38 : * @brief A /melt Handle
39 : */
40 : struct TALER_EXCHANGE_MeltHandle
41 : {
42 :
43 : /**
44 : * The keys of the this request handle will use
45 : */
46 : struct TALER_EXCHANGE_Keys *keys;
47 :
48 : /**
49 : * The url for this request.
50 : */
51 : char *url;
52 :
53 : /**
54 : * The exchange base url.
55 : */
56 : char *exchange_url;
57 :
58 : /**
59 : * Curl context.
60 : */
61 : struct GNUNET_CURL_Context *cctx;
62 :
63 : /**
64 : * Context for #TEH_curl_easy_post(). Keeps the data that must
65 : * persist for Curl to make the upload.
66 : */
67 : struct TALER_CURL_PostContext ctx;
68 :
69 : /**
70 : * Handle for the request.
71 : */
72 : struct GNUNET_CURL_Job *job;
73 :
74 : /**
75 : * Function to call with refresh melt failure results.
76 : */
77 : TALER_EXCHANGE_MeltCallback melt_cb;
78 :
79 : /**
80 : * Closure for @e result_cb and @e melt_failure_cb.
81 : */
82 : void *melt_cb_cls;
83 :
84 : /**
85 : * Actual information about the melt operation.
86 : */
87 : struct MeltData md;
88 :
89 : /**
90 : * The seed for the melt operation.
91 : */
92 : struct TALER_PublicRefreshMasterSeedP rms;
93 :
94 : /**
95 : * Details about the characteristics of the requested melt operation.
96 : */
97 : const struct TALER_EXCHANGE_MeltInput *rd;
98 :
99 : /**
100 : * True, if no blinding_seed is needed (no CS denominations involved)
101 : */
102 : bool no_blinding_seed;
103 :
104 : /**
105 : * If @e no_blinding_seed is false, the blinding seed for the intermediate
106 : * call to /blinding-prepare, in order to retrieve the R-values from the
107 : * exchange for the blind Clause-Schnorr signature.
108 : */
109 : struct TALER_BlindingMasterSeedP blinding_seed;
110 :
111 : /**
112 : * Array of `num_fresh_denom_pubs` per-coin values
113 : * returned from melt operation.
114 : */
115 : struct TALER_ExchangeBlindingValues *melt_blinding_values;
116 :
117 : /**
118 : * Handle for the preflight request, or NULL.
119 : */
120 : struct TALER_EXCHANGE_BlindingPrepareHandle *bpr;
121 :
122 : /**
123 : * Public key of the coin being melted.
124 : */
125 : struct TALER_CoinSpendPublicKeyP coin_pub;
126 :
127 : /**
128 : * Signature affirming the melt.
129 : */
130 : struct TALER_CoinSpendSignatureP coin_sig;
131 :
132 : /**
133 : * @brief Public information about the coin's denomination key
134 : */
135 : const struct TALER_EXCHANGE_DenomPublicKey *dki;
136 :
137 : /**
138 : * Gamma value chosen by the exchange during melt.
139 : */
140 : uint32_t noreveal_index;
141 :
142 : };
143 :
144 :
145 : /**
146 : * Verify that the signature on the "200 OK" response
147 : * from the exchange is valid.
148 : *
149 : * @param[in,out] mh melt handle
150 : * @param json json reply with the signature
151 : * @param[out] exchange_pub public key of the exchange used for the signature
152 : * @return #GNUNET_OK if the signature is valid, #GNUNET_SYSERR if not
153 : */
154 : static enum GNUNET_GenericReturnValue
155 16 : verify_melt_signature_ok (struct TALER_EXCHANGE_MeltHandle *mh,
156 : const json_t *json,
157 : struct TALER_ExchangePublicKeyP *exchange_pub)
158 : {
159 : struct TALER_ExchangeSignatureP exchange_sig;
160 : struct GNUNET_JSON_Specification spec[] = {
161 16 : GNUNET_JSON_spec_fixed_auto ("exchange_sig",
162 : &exchange_sig),
163 16 : GNUNET_JSON_spec_fixed_auto ("exchange_pub",
164 : exchange_pub),
165 16 : GNUNET_JSON_spec_uint32 ("noreveal_index",
166 : &mh->noreveal_index),
167 16 : GNUNET_JSON_spec_end ()
168 : };
169 :
170 16 : if (GNUNET_OK !=
171 16 : GNUNET_JSON_parse (json,
172 : spec,
173 : NULL, NULL))
174 : {
175 0 : GNUNET_break_op (0);
176 0 : return GNUNET_SYSERR;
177 : }
178 : /* check that exchange signing key is permitted */
179 16 : if (GNUNET_OK !=
180 16 : TALER_EXCHANGE_test_signing_key (mh->keys,
181 : exchange_pub))
182 : {
183 0 : GNUNET_break_op (0);
184 0 : return GNUNET_SYSERR;
185 : }
186 :
187 : /* check that noreveal index is in permitted range */
188 16 : if (TALER_CNC_KAPPA <= mh->noreveal_index)
189 : {
190 0 : GNUNET_break_op (0);
191 0 : return GNUNET_SYSERR;
192 : }
193 :
194 16 : if (GNUNET_OK !=
195 16 : TALER_exchange_online_melt_confirmation_verify (
196 16 : &mh->md.rc,
197 : mh->noreveal_index,
198 : exchange_pub,
199 : &exchange_sig))
200 : {
201 0 : GNUNET_break_op (0);
202 0 : return GNUNET_SYSERR;
203 : }
204 16 : return GNUNET_OK;
205 : }
206 :
207 :
208 : /**
209 : * Function called when we're done processing the
210 : * HTTP /melt request.
211 : *
212 : * @param cls the `struct TALER_EXCHANGE_MeltHandle`
213 : * @param response_code HTTP response code, 0 on error
214 : * @param response parsed JSON result, NULL on error
215 : */
216 : static void
217 30 : handle_melt_finished (void *cls,
218 : long response_code,
219 : const void *response)
220 : {
221 30 : struct TALER_EXCHANGE_MeltHandle *mh = cls;
222 30 : const json_t *j = response;
223 30 : struct TALER_EXCHANGE_MeltResponse mr = {
224 : .hr.reply = j,
225 30 : .hr.http_status = (unsigned int) response_code
226 : };
227 :
228 30 : mh->job = NULL;
229 30 : switch (response_code)
230 : {
231 0 : case 0:
232 0 : mr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
233 0 : break;
234 16 : case MHD_HTTP_OK:
235 16 : if (GNUNET_OK !=
236 16 : verify_melt_signature_ok (mh,
237 : j,
238 : &mr.details.ok.sign_key))
239 : {
240 0 : GNUNET_break_op (0);
241 0 : mr.hr.http_status = 0;
242 0 : mr.hr.ec = TALER_EC_EXCHANGE_MELT_INVALID_SIGNATURE_BY_EXCHANGE;
243 0 : break;
244 : }
245 16 : mr.details.ok.noreveal_index = mh->noreveal_index;
246 16 : mr.details.ok.num_melt_blinding_values = mh->rd->num_fresh_denom_pubs;
247 16 : mr.details.ok.melt_blinding_values = mh->melt_blinding_values;
248 32 : mr.details.ok.blinding_seed = mh->no_blinding_seed
249 : ? NULL
250 16 : : &mh->blinding_seed;
251 16 : mh->melt_cb (mh->melt_cb_cls,
252 : &mr);
253 16 : mh->melt_cb = NULL;
254 16 : break;
255 0 : case MHD_HTTP_BAD_REQUEST:
256 : /* This should never happen, either us or the exchange is buggy
257 : (or API version conflict); just pass JSON reply to the application */
258 0 : mr.hr.ec = TALER_JSON_get_error_code (j);
259 0 : mr.hr.hint = TALER_JSON_get_error_hint (j);
260 0 : break;
261 14 : case MHD_HTTP_CONFLICT:
262 14 : mr.hr.ec = TALER_JSON_get_error_code (j);
263 14 : mr.hr.hint = TALER_JSON_get_error_hint (j);
264 14 : break;
265 0 : case MHD_HTTP_FORBIDDEN:
266 : /* Nothing really to verify, exchange says one of the signatures is
267 : invalid; assuming we checked them, this should never happen, we
268 : should pass the JSON reply to the application */
269 0 : mr.hr.ec = TALER_JSON_get_error_code (j);
270 0 : mr.hr.hint = TALER_JSON_get_error_hint (j);
271 0 : break;
272 0 : case MHD_HTTP_NOT_FOUND:
273 : /* Nothing really to verify, this should never
274 : happen, we should pass the JSON reply to the application */
275 0 : mr.hr.ec = TALER_JSON_get_error_code (j);
276 0 : mr.hr.hint = TALER_JSON_get_error_hint (j);
277 0 : break;
278 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
279 : /* Server had an internal issue; we should retry, but this API
280 : leaves this to the application */
281 0 : mr.hr.ec = TALER_JSON_get_error_code (j);
282 0 : mr.hr.hint = TALER_JSON_get_error_hint (j);
283 0 : break;
284 0 : default:
285 : /* unexpected response code */
286 0 : mr.hr.ec = TALER_JSON_get_error_code (j);
287 0 : mr.hr.hint = TALER_JSON_get_error_hint (j);
288 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
289 : "Unexpected response code %u/%d for exchange melt\n",
290 : (unsigned int) response_code,
291 : mr.hr.ec);
292 0 : GNUNET_break_op (0);
293 0 : break;
294 : }
295 30 : if (NULL != mh->melt_cb)
296 14 : mh->melt_cb (mh->melt_cb_cls,
297 : &mr);
298 30 : TALER_EXCHANGE_melt_cancel (mh);
299 30 : }
300 :
301 :
302 : /**
303 : * Start the actual melt operation, now that we have
304 : * the exchange's input values.
305 : *
306 : * @param[in,out] mh melt operation to run
307 : * @return #GNUNET_OK if we could start the operation
308 : */
309 : static enum GNUNET_GenericReturnValue
310 30 : start_melt (struct TALER_EXCHANGE_MeltHandle *mh)
311 : {
312 : json_t *j_request_body;
313 : json_t *j_transfer_pubs;
314 : json_t *j_coin_evs;
315 : CURL *eh;
316 : struct TALER_DenominationHashP h_denom_pub;
317 :
318 30 : if (GNUNET_OK !=
319 30 : TALER_EXCHANGE_get_melt_data (&mh->rms,
320 : mh->rd,
321 30 : mh->no_blinding_seed
322 : ? NULL
323 : : &mh->blinding_seed,
324 30 : mh->melt_blinding_values,
325 : &mh->md))
326 : {
327 0 : GNUNET_break (0);
328 0 : return GNUNET_SYSERR;
329 : }
330 30 : TALER_denom_pub_hash (
331 30 : &mh->md.melted_coin.pub_key,
332 : &h_denom_pub);
333 30 : TALER_wallet_melt_sign (
334 30 : &mh->md.melted_coin.melt_amount_with_fee,
335 30 : &mh->md.melted_coin.fee_melt,
336 30 : &mh->md.rc,
337 : &h_denom_pub,
338 : mh->md.melted_coin.h_age_commitment,
339 30 : &mh->md.melted_coin.coin_priv,
340 : &mh->coin_sig);
341 30 : GNUNET_CRYPTO_eddsa_key_get_public (
342 30 : &mh->md.melted_coin.coin_priv.eddsa_priv,
343 : &mh->coin_pub.eddsa_pub);
344 60 : mh->dki = TALER_EXCHANGE_get_denomination_key (
345 30 : mh->keys,
346 30 : &mh->md.melted_coin.pub_key);
347 30 : j_request_body = GNUNET_JSON_PACK (
348 : GNUNET_JSON_pack_data_auto ("old_coin_pub",
349 : &mh->coin_pub),
350 : GNUNET_JSON_pack_data_auto ("old_denom_pub_h",
351 : &h_denom_pub),
352 : TALER_JSON_pack_denom_sig ("old_denom_sig",
353 : &mh->md.melted_coin.sig),
354 : GNUNET_JSON_pack_data_auto ("confirm_sig",
355 : &mh->coin_sig),
356 : TALER_JSON_pack_amount ("value_with_fee",
357 : &mh->md.melted_coin.melt_amount_with_fee),
358 : GNUNET_JSON_pack_allow_null (
359 : (NULL != mh->md.melted_coin.h_age_commitment)
360 : ? GNUNET_JSON_pack_data_auto ("old_age_commitment_h",
361 : mh->md.melted_coin.h_age_commitment)
362 : : GNUNET_JSON_pack_string ("old_age_commitment_h",
363 : NULL)),
364 : GNUNET_JSON_pack_data_auto ("refresh_seed",
365 : &mh->md.refresh_seed),
366 : GNUNET_JSON_pack_allow_null (
367 : (mh->md.no_blinding_seed)
368 : ? GNUNET_JSON_pack_string ("blinding_seed",
369 : NULL)
370 : : GNUNET_JSON_pack_data_auto ("blinding_seed",
371 : &mh->md.blinding_seed)),
372 : TALER_JSON_pack_array_of_data_auto ("denoms_h",
373 : mh->md.num_fresh_coins,
374 : mh->md.denoms_h)
375 : );
376 30 : GNUNET_assert (NULL != j_request_body);
377 30 : GNUNET_assert (NULL !=
378 : (j_transfer_pubs = json_array ()));
379 30 : GNUNET_assert (NULL !=
380 : (j_coin_evs = json_array ()));
381 : /**
382 : * Fill the kappa array of coin envelopes and
383 : * the array of transfer pubs.
384 : */
385 120 : for (uint8_t k=0; k<TALER_CNC_KAPPA; k++)
386 : {
387 : json_t *j_envs;
388 90 : json_t *j_tbs = GNUNET_JSON_PACK (
389 : TALER_JSON_pack_array_of_data_auto (NULL,
390 : mh->md.num_fresh_coins,
391 : mh->md.kappa_transfer_pubs[k])
392 : );
393 :
394 90 : GNUNET_assert (NULL != (j_envs = json_array ()));
395 90 : GNUNET_assert (NULL !=j_tbs);
396 :
397 450 : for (size_t i = 0; i < mh->md.num_fresh_coins; i++)
398 : {
399 360 : json_t *j_coin = GNUNET_JSON_PACK (
400 : TALER_JSON_pack_blinded_planchet (NULL,
401 : &mh->md.kappa_blinded_planchets[k][i]));
402 360 : GNUNET_assert (NULL != j_coin);
403 360 : GNUNET_assert (0 ==
404 : json_array_append_new (j_envs, j_coin));
405 : }
406 90 : GNUNET_assert (0 ==
407 : json_array_append_new (j_coin_evs, j_envs));
408 90 : GNUNET_assert (0 ==
409 : json_array_append_new (j_transfer_pubs, j_tbs));
410 : }
411 30 : GNUNET_assert (0 ==
412 : json_object_set_new (j_request_body,
413 : "coin_evs",
414 : j_coin_evs));
415 30 : GNUNET_assert (0 ==
416 : json_object_set_new (j_request_body,
417 : "transfer_pubs",
418 : j_transfer_pubs));
419 : /* and now we can at last begin the actual request handling */
420 30 : mh->url = TALER_url_join (mh->exchange_url,
421 : "melt",
422 : NULL);
423 30 : if (NULL == mh->url)
424 : {
425 0 : json_decref (j_request_body);
426 0 : return GNUNET_SYSERR;
427 : }
428 30 : eh = TALER_EXCHANGE_curl_easy_get_ (mh->url);
429 60 : if ( (NULL == eh) ||
430 : (GNUNET_OK !=
431 30 : TALER_curl_easy_post (&mh->ctx,
432 : eh,
433 : j_request_body)) )
434 : {
435 0 : GNUNET_break (0);
436 0 : if (NULL != eh)
437 0 : curl_easy_cleanup (eh);
438 0 : json_decref (j_request_body);
439 0 : return GNUNET_SYSERR;
440 : }
441 30 : json_decref (j_request_body);
442 60 : mh->job = GNUNET_CURL_job_add2 (mh->cctx,
443 : eh,
444 30 : mh->ctx.headers,
445 : &handle_melt_finished,
446 : mh);
447 30 : return GNUNET_OK;
448 : }
449 :
450 :
451 : /**
452 : * The melt request @a mh failed, return an error to
453 : * the application and cancel the operation.
454 : *
455 : * @param[in] mh melt request that failed
456 : * @param ec error code to fail with
457 : */
458 : static void
459 0 : fail_mh (struct TALER_EXCHANGE_MeltHandle *mh,
460 : enum TALER_ErrorCode ec)
461 : {
462 0 : struct TALER_EXCHANGE_MeltResponse mr = {
463 : .hr.ec = ec
464 : };
465 :
466 0 : mh->melt_cb (mh->melt_cb_cls,
467 : &mr);
468 0 : TALER_EXCHANGE_melt_cancel (mh);
469 0 : }
470 :
471 :
472 : /**
473 : * Callbacks of this type are used to serve the result of submitting a
474 : * /blinding-prepare request to a exchange.
475 : *
476 : * @param cls closure with our `struct TALER_EXCHANGE_MeltHandle *`
477 : * @param bpr response details
478 : */
479 : static void
480 15 : blinding_prepare_cb (void *cls,
481 : const struct TALER_EXCHANGE_BlindingPrepareResponse *bpr)
482 : {
483 15 : struct TALER_EXCHANGE_MeltHandle *mh = cls;
484 15 : unsigned int nks_off = 0;
485 :
486 15 : mh->bpr = NULL;
487 15 : if (MHD_HTTP_OK != bpr->hr.http_status)
488 : {
489 0 : struct TALER_EXCHANGE_MeltResponse mr = {
490 : .hr = bpr->hr
491 : };
492 :
493 0 : mr.hr.hint = "/blinding-prepare failed";
494 0 : mh->melt_cb (mh->melt_cb_cls,
495 : &mr);
496 0 : TALER_EXCHANGE_melt_cancel (mh);
497 0 : return;
498 : }
499 75 : for (unsigned int i = 0; i<mh->rd->num_fresh_denom_pubs; i++)
500 : {
501 60 : const struct TALER_EXCHANGE_DenomPublicKey *fresh_pk =
502 60 : &mh->rd->fresh_denom_pubs[i];
503 60 : struct TALER_ExchangeBlindingValues *wv = &mh->melt_blinding_values[i];
504 :
505 60 : switch (fresh_pk->key.bsign_pub_key->cipher)
506 : {
507 0 : case GNUNET_CRYPTO_BSA_INVALID:
508 0 : GNUNET_break (0);
509 0 : fail_mh (mh,
510 : TALER_EC_GENERIC_CLIENT_INTERNAL_ERROR);
511 0 : return;
512 0 : case GNUNET_CRYPTO_BSA_RSA:
513 0 : break;
514 60 : case GNUNET_CRYPTO_BSA_CS:
515 60 : TALER_denom_ewv_copy (wv,
516 60 : &bpr->details.ok.blinding_values[nks_off]);
517 60 : nks_off++;
518 60 : break;
519 : }
520 : }
521 15 : if (GNUNET_OK !=
522 15 : start_melt (mh))
523 : {
524 0 : GNUNET_break (0);
525 0 : fail_mh (mh,
526 : TALER_EC_GENERIC_CLIENT_INTERNAL_ERROR);
527 0 : return;
528 : }
529 : }
530 :
531 :
532 : struct TALER_EXCHANGE_MeltHandle *
533 30 : TALER_EXCHANGE_melt (
534 : struct GNUNET_CURL_Context *ctx,
535 : const char *url,
536 : struct TALER_EXCHANGE_Keys *keys,
537 : const struct TALER_PublicRefreshMasterSeedP *rms,
538 : const struct TALER_EXCHANGE_MeltInput *rd,
539 : TALER_EXCHANGE_MeltCallback melt_cb,
540 : void *melt_cb_cls)
541 30 : {
542 30 : struct TALER_EXCHANGE_NonceKey nks[GNUNET_NZL (rd->num_fresh_denom_pubs)];
543 30 : unsigned int nks_off = 0;
544 : struct TALER_EXCHANGE_MeltHandle *mh;
545 :
546 30 : if (0 == rd->num_fresh_denom_pubs)
547 : {
548 0 : GNUNET_break (0);
549 0 : return NULL;
550 : }
551 30 : mh = GNUNET_new (struct TALER_EXCHANGE_MeltHandle);
552 30 : mh->noreveal_index = TALER_CNC_KAPPA; /* invalid value */
553 30 : mh->cctx = ctx;
554 30 : mh->exchange_url = GNUNET_strdup (url);
555 30 : mh->rd = rd;
556 30 : mh->rms = *rms;
557 30 : mh->melt_cb = melt_cb;
558 30 : mh->melt_cb_cls = melt_cb_cls;
559 30 : mh->no_blinding_seed = true;
560 30 : mh->melt_blinding_values =
561 30 : GNUNET_new_array (rd->num_fresh_denom_pubs,
562 : struct TALER_ExchangeBlindingValues);
563 150 : for (unsigned int i = 0; i<rd->num_fresh_denom_pubs; i++)
564 : {
565 120 : const struct TALER_EXCHANGE_DenomPublicKey *fresh_pk =
566 120 : &rd->fresh_denom_pubs[i];
567 :
568 120 : switch (fresh_pk->key.bsign_pub_key->cipher)
569 : {
570 0 : case GNUNET_CRYPTO_BSA_INVALID:
571 0 : GNUNET_break (0);
572 0 : GNUNET_free (mh->melt_blinding_values);
573 0 : GNUNET_free (mh);
574 0 : return NULL;
575 60 : case GNUNET_CRYPTO_BSA_RSA:
576 60 : TALER_denom_ewv_copy (&mh->melt_blinding_values[i],
577 : TALER_denom_ewv_rsa_singleton ());
578 60 : break;
579 60 : case GNUNET_CRYPTO_BSA_CS:
580 60 : nks[nks_off].pk = fresh_pk;
581 60 : nks[nks_off].cnc_num = i;
582 60 : nks_off++;
583 60 : break;
584 : }
585 : }
586 30 : mh->keys = TALER_EXCHANGE_keys_incref (keys);
587 30 : if (0 != nks_off)
588 : {
589 15 : mh->no_blinding_seed = false;
590 15 : TALER_cs_refresh_seed_to_blinding_seed (
591 : rms,
592 15 : &mh->md.melted_coin.coin_priv,
593 : &mh->blinding_seed);
594 15 : mh->bpr = TALER_EXCHANGE_blinding_prepare_for_melt (ctx,
595 : url,
596 : &mh->blinding_seed,
597 : nks_off,
598 : nks,
599 : &blinding_prepare_cb,
600 : mh);
601 15 : if (NULL == mh->bpr)
602 : {
603 0 : GNUNET_break (0);
604 0 : TALER_EXCHANGE_melt_cancel (mh);
605 0 : return NULL;
606 : }
607 15 : return mh;
608 : }
609 15 : if (GNUNET_OK !=
610 15 : start_melt (mh))
611 : {
612 0 : GNUNET_break (0);
613 0 : TALER_EXCHANGE_melt_cancel (mh);
614 0 : return NULL;
615 : }
616 15 : return mh;
617 : }
618 :
619 :
620 : void
621 30 : TALER_EXCHANGE_melt_cancel (struct TALER_EXCHANGE_MeltHandle *mh)
622 : {
623 150 : for (unsigned int i = 0; i<mh->rd->num_fresh_denom_pubs; i++)
624 120 : TALER_denom_ewv_free (&mh->melt_blinding_values[i]);
625 30 : if (NULL != mh->job)
626 : {
627 0 : GNUNET_CURL_job_cancel (mh->job);
628 0 : mh->job = NULL;
629 : }
630 30 : if (NULL != mh->bpr)
631 : {
632 0 : TALER_EXCHANGE_blinding_prepare_cancel (mh->bpr);
633 0 : mh->bpr = NULL;
634 : }
635 30 : TALER_EXCHANGE_free_melt_data (&mh->md); /* does not free 'md' itself */
636 30 : GNUNET_free (mh->melt_blinding_values);
637 30 : GNUNET_free (mh->url);
638 30 : GNUNET_free (mh->exchange_url);
639 30 : TALER_curl_easy_post_finished (&mh->ctx);
640 30 : TALER_EXCHANGE_keys_decref (mh->keys);
641 30 : GNUNET_free (mh);
642 30 : }
643 :
644 :
645 : /* end of exchange_api_melt.c */
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