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_v27.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_v27
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_v27 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_v27 md;
88 :
89 : /**
90 : * The secret the entire melt operation is seeded from.
91 : */
92 : struct TALER_RefreshMasterSecretP 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_v27_signature_ok (struct TALER_EXCHANGE_MeltHandle_v27 *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 /coins/$COIN_PUB/melt request.
211 : *
212 : * @param cls the `struct TALER_EXCHANGE_MeltHandle_v27`
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_v27_finished (void *cls,
218 : long response_code,
219 : const void *response)
220 : {
221 30 : struct TALER_EXCHANGE_MeltHandle_v27 *mh = cls;
222 30 : const json_t *j = response;
223 30 : struct TALER_EXCHANGE_MeltResponse_v27 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_v27_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_v27_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_v27 *mh)
311 : {
312 : json_t *j_request_body;
313 : json_t *j_coin_evs;
314 : CURL *eh;
315 : struct TALER_DenominationHashP h_denom_pub;
316 :
317 30 : if (GNUNET_OK !=
318 30 : TALER_EXCHANGE_get_melt_data_v27 (&mh->rms,
319 : mh->rd,
320 30 : mh->no_blinding_seed
321 : ? NULL
322 : : &mh->blinding_seed,
323 30 : mh->melt_blinding_values,
324 : &mh->md))
325 : {
326 0 : GNUNET_break (0);
327 0 : return GNUNET_SYSERR;
328 : }
329 30 : TALER_denom_pub_hash (&mh->md.melted_coin.pub_key,
330 : &h_denom_pub);
331 30 : TALER_wallet_melt_sign (
332 30 : &mh->md.melted_coin.melt_amount_with_fee,
333 30 : &mh->md.melted_coin.fee_melt,
334 30 : &mh->md.rc,
335 : &h_denom_pub,
336 : mh->md.melted_coin.h_age_commitment,
337 30 : &mh->md.melted_coin.coin_priv,
338 : &mh->coin_sig);
339 30 : GNUNET_CRYPTO_eddsa_key_get_public (
340 30 : &mh->md.melted_coin.coin_priv.eddsa_priv,
341 : &mh->coin_pub.eddsa_pub);
342 60 : mh->dki = TALER_EXCHANGE_get_denomination_key (mh->keys,
343 30 : &mh->md.melted_coin.pub_key);
344 30 : j_request_body = GNUNET_JSON_PACK (
345 : GNUNET_JSON_pack_data_auto ("old_coin_pub",
346 : &mh->coin_pub),
347 : GNUNET_JSON_pack_data_auto ("old_denom_pub_h",
348 : &h_denom_pub),
349 : TALER_JSON_pack_denom_sig ("old_denom_sig",
350 : &mh->md.melted_coin.sig),
351 : GNUNET_JSON_pack_data_auto ("confirm_sig",
352 : &mh->coin_sig),
353 : TALER_JSON_pack_amount ("value_with_fee",
354 : &mh->md.melted_coin.melt_amount_with_fee),
355 : GNUNET_JSON_pack_allow_null (
356 : (NULL != mh->md.melted_coin.h_age_commitment)
357 : ? GNUNET_JSON_pack_data_auto ("old_age_commitment_h",
358 : mh->md.melted_coin.h_age_commitment)
359 : : GNUNET_JSON_pack_string ("old_age_commitment_h",
360 : NULL)),
361 : GNUNET_JSON_pack_data_auto ("refresh_seed",
362 : &mh->md.refresh_seed),
363 : GNUNET_JSON_pack_allow_null (
364 : (mh->md.no_blinding_seed)
365 : ? GNUNET_JSON_pack_string ("blinding_seed",
366 : NULL)
367 : : GNUNET_JSON_pack_data_auto ("blinding_seed",
368 : &mh->md.blinding_seed)),
369 : TALER_JSON_pack_array_of_data ("denoms_h",
370 : mh->md.num_fresh_coins,
371 : mh->md.denoms_h,
372 : sizeof(*mh->md.denoms_h))
373 : );
374 30 : GNUNET_assert (NULL != j_request_body);
375 30 : j_coin_evs = json_array ();
376 30 : GNUNET_assert (NULL != j_coin_evs);
377 : /**
378 : * Fill the kappa array of coin envelopes
379 : */
380 120 : for (uint8_t k=0; k<TALER_CNC_KAPPA; k++)
381 : {
382 90 : json_t *j_envs = json_array ();
383 90 : GNUNET_assert (NULL != j_envs);
384 450 : for (size_t i = 0; i < mh->md.num_fresh_coins; i++)
385 : {
386 360 : json_t *j_coin = GNUNET_JSON_PACK (
387 : TALER_JSON_pack_blinded_planchet (NULL,
388 : &mh->md.kappa_blinded_planchets[k][i])
389 : );
390 360 : GNUNET_assert (NULL != j_coin);
391 360 : GNUNET_assert (0 ==
392 : json_array_append_new (j_envs, j_coin));
393 : }
394 90 : GNUNET_assert (0 ==
395 : json_array_append_new (j_coin_evs, j_envs));
396 : }
397 30 : GNUNET_assert (0 ==
398 : json_object_set_new (j_request_body,
399 : "coin_evs",
400 : j_coin_evs));
401 : /* and now we can at last begin the actual request handling */
402 30 : mh->url = TALER_url_join (mh->exchange_url,
403 : "melt",
404 : NULL);
405 30 : if (NULL == mh->url)
406 : {
407 0 : json_decref (j_request_body);
408 0 : return GNUNET_SYSERR;
409 : }
410 30 : eh = TALER_EXCHANGE_curl_easy_get_ (mh->url);
411 60 : if ( (NULL == eh) ||
412 : (GNUNET_OK !=
413 30 : TALER_curl_easy_post (&mh->ctx,
414 : eh,
415 : j_request_body)) )
416 : {
417 0 : GNUNET_break (0);
418 0 : if (NULL != eh)
419 0 : curl_easy_cleanup (eh);
420 0 : json_decref (j_request_body);
421 0 : return GNUNET_SYSERR;
422 : }
423 30 : json_decref (j_request_body);
424 60 : mh->job = GNUNET_CURL_job_add2 (mh->cctx,
425 : eh,
426 30 : mh->ctx.headers,
427 : &handle_melt_v27_finished,
428 : mh);
429 30 : return GNUNET_OK;
430 : }
431 :
432 :
433 : /**
434 : * The melt request @a mh failed, return an error to
435 : * the application and cancel the operation.
436 : *
437 : * @param[in] mh melt request that failed
438 : * @param ec error code to fail with
439 : */
440 : static void
441 0 : fail_mh (struct TALER_EXCHANGE_MeltHandle_v27 *mh,
442 : enum TALER_ErrorCode ec)
443 : {
444 0 : struct TALER_EXCHANGE_MeltResponse_v27 mr = {
445 : .hr.ec = ec
446 : };
447 :
448 0 : mh->melt_cb (mh->melt_cb_cls,
449 : &mr);
450 0 : TALER_EXCHANGE_melt_v27_cancel (mh);
451 0 : }
452 :
453 :
454 : /**
455 : * Callbacks of this type are used to serve the result of submitting a
456 : * /blinding-prepare request to a exchange.
457 : *
458 : * @param cls closure with our `struct TALER_EXCHANGE_MeltHandle_v27 *`
459 : * @param bpr response details
460 : */
461 : static void
462 15 : blinding_prepare_cb (void *cls,
463 : const struct TALER_EXCHANGE_BlindingPrepareResponse *bpr)
464 : {
465 15 : struct TALER_EXCHANGE_MeltHandle_v27 *mh = cls;
466 15 : unsigned int nks_off = 0;
467 :
468 15 : mh->bpr = NULL;
469 15 : if (MHD_HTTP_OK != bpr->hr.http_status)
470 : {
471 0 : struct TALER_EXCHANGE_MeltResponse_v27 mr = {
472 : .hr = bpr->hr
473 : };
474 :
475 0 : mr.hr.hint = "/blinding-prepare failed";
476 0 : mh->melt_cb (mh->melt_cb_cls,
477 : &mr);
478 0 : TALER_EXCHANGE_melt_v27_cancel (mh);
479 0 : return;
480 : }
481 75 : for (unsigned int i = 0; i<mh->rd->num_fresh_denom_pubs; i++)
482 : {
483 60 : const struct TALER_EXCHANGE_DenomPublicKey *fresh_pk =
484 60 : &mh->rd->fresh_denom_pubs[i];
485 60 : struct TALER_ExchangeBlindingValues *wv = &mh->melt_blinding_values[i];
486 :
487 60 : switch (fresh_pk->key.bsign_pub_key->cipher)
488 : {
489 0 : case GNUNET_CRYPTO_BSA_INVALID:
490 0 : GNUNET_break (0);
491 0 : fail_mh (mh,
492 : TALER_EC_GENERIC_CLIENT_INTERNAL_ERROR);
493 0 : return;
494 0 : case GNUNET_CRYPTO_BSA_RSA:
495 0 : break;
496 60 : case GNUNET_CRYPTO_BSA_CS:
497 60 : TALER_denom_ewv_copy (wv,
498 60 : &bpr->details.ok.blinding_values[nks_off]);
499 60 : nks_off++;
500 60 : break;
501 : }
502 : }
503 15 : if (GNUNET_OK !=
504 15 : start_melt (mh))
505 : {
506 0 : GNUNET_break (0);
507 0 : fail_mh (mh,
508 : TALER_EC_GENERIC_CLIENT_INTERNAL_ERROR);
509 0 : return;
510 : }
511 : }
512 :
513 :
514 : struct TALER_EXCHANGE_MeltHandle_v27 *
515 30 : TALER_EXCHANGE_melt_v27 (
516 : struct GNUNET_CURL_Context *ctx,
517 : const char *url,
518 : struct TALER_EXCHANGE_Keys *keys,
519 : const struct TALER_RefreshMasterSecretP *rms,
520 : const struct TALER_EXCHANGE_MeltInput *rd,
521 : TALER_EXCHANGE_MeltCallback_v27 melt_cb,
522 : void *melt_cb_cls)
523 30 : {
524 30 : struct TALER_EXCHANGE_NonceKey nks[GNUNET_NZL (rd->num_fresh_denom_pubs)];
525 30 : unsigned int nks_off = 0;
526 : struct TALER_EXCHANGE_MeltHandle_v27 *mh;
527 :
528 30 : if (0 == rd->num_fresh_denom_pubs)
529 : {
530 0 : GNUNET_break (0);
531 0 : return NULL;
532 : }
533 30 : mh = GNUNET_new (struct TALER_EXCHANGE_MeltHandle_v27);
534 30 : mh->noreveal_index = TALER_CNC_KAPPA; /* invalid value */
535 30 : mh->cctx = ctx;
536 30 : mh->exchange_url = GNUNET_strdup (url);
537 30 : mh->rd = rd;
538 30 : mh->rms = *rms;
539 30 : mh->melt_cb = melt_cb;
540 30 : mh->melt_cb_cls = melt_cb_cls;
541 30 : mh->no_blinding_seed = true;
542 30 : mh->melt_blinding_values =
543 30 : GNUNET_new_array (rd->num_fresh_denom_pubs,
544 : struct TALER_ExchangeBlindingValues);
545 150 : for (unsigned int i = 0; i<rd->num_fresh_denom_pubs; i++)
546 : {
547 120 : const struct TALER_EXCHANGE_DenomPublicKey *fresh_pk =
548 120 : &rd->fresh_denom_pubs[i];
549 :
550 120 : switch (fresh_pk->key.bsign_pub_key->cipher)
551 : {
552 0 : case GNUNET_CRYPTO_BSA_INVALID:
553 0 : GNUNET_break (0);
554 0 : GNUNET_free (mh->melt_blinding_values);
555 0 : GNUNET_free (mh);
556 0 : return NULL;
557 60 : case GNUNET_CRYPTO_BSA_RSA:
558 60 : TALER_denom_ewv_copy (&mh->melt_blinding_values[i],
559 : TALER_denom_ewv_rsa_singleton ());
560 60 : break;
561 60 : case GNUNET_CRYPTO_BSA_CS:
562 60 : nks[nks_off].pk = fresh_pk;
563 60 : nks[nks_off].cnc_num = i;
564 60 : nks_off++;
565 60 : break;
566 : }
567 : }
568 30 : mh->keys = TALER_EXCHANGE_keys_incref (keys);
569 30 : if (0 != nks_off)
570 : {
571 15 : mh->no_blinding_seed = false;
572 15 : TALER_cs_refresh_secret_to_blinding_seed (
573 : rms,
574 : &mh->blinding_seed);
575 15 : mh->bpr = TALER_EXCHANGE_blinding_prepare_for_melt (ctx,
576 : url,
577 : &mh->blinding_seed,
578 : nks_off,
579 : nks,
580 : &blinding_prepare_cb,
581 : mh);
582 15 : if (NULL == mh->bpr)
583 : {
584 0 : GNUNET_break (0);
585 0 : TALER_EXCHANGE_melt_v27_cancel (mh);
586 0 : return NULL;
587 : }
588 15 : return mh;
589 : }
590 15 : if (GNUNET_OK !=
591 15 : start_melt (mh))
592 : {
593 0 : GNUNET_break (0);
594 0 : TALER_EXCHANGE_melt_v27_cancel (mh);
595 0 : return NULL;
596 : }
597 15 : return mh;
598 : }
599 :
600 :
601 : void
602 30 : TALER_EXCHANGE_melt_v27_cancel (struct TALER_EXCHANGE_MeltHandle_v27 *mh)
603 : {
604 150 : for (unsigned int i = 0; i<mh->rd->num_fresh_denom_pubs; i++)
605 120 : TALER_denom_ewv_free (&mh->melt_blinding_values[i]);
606 30 : if (NULL != mh->job)
607 : {
608 0 : GNUNET_CURL_job_cancel (mh->job);
609 0 : mh->job = NULL;
610 : }
611 30 : if (NULL != mh->bpr)
612 : {
613 0 : TALER_EXCHANGE_blinding_prepare_cancel (mh->bpr);
614 0 : mh->bpr = NULL;
615 : }
616 30 : TALER_EXCHANGE_free_melt_data_v27 (&mh->md); /* does not free 'md' itself */
617 30 : GNUNET_free (mh->melt_blinding_values);
618 30 : GNUNET_free (mh->url);
619 30 : GNUNET_free (mh->exchange_url);
620 30 : TALER_curl_easy_post_finished (&mh->ctx);
621 30 : TALER_EXCHANGE_keys_decref (mh->keys);
622 30 : GNUNET_free (mh);
623 30 : }
624 :
625 :
626 : /* end of exchange_api_melt.c */
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