aboutsummaryrefslogtreecommitdiff
path: root/src/lib/exchange_api_purse_create_with_deposit.c
blob: fff898e570786958e125122585d0b17b2a406cb0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
/*
   This file is part of TALER
   Copyright (C) 2022-2023 Taler Systems SA

   TALER is free software; you can redistribute it and/or modify it under the
   terms of the GNU General Public License as published by the Free Software
   Foundation; either version 3, or (at your option) any later version.

   TALER is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

   You should have received a copy of the GNU General Public License along with
   TALER; see the file COPYING.  If not, see
   <http://www.gnu.org/licenses/>
 */
/**
 * @file lib/exchange_api_purse_create_with_deposit.c
 * @brief Implementation of the client to create a purse with
 *        an initial set of deposits (and a contract)
 * @author Christian Grothoff
 */
#include "platform.h"
#include <jansson.h>
#include <microhttpd.h> /* just for HTTP status codes */
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_json_lib.h>
#include <gnunet/gnunet_curl_lib.h>
#include "taler_json_lib.h"
#include "taler_exchange_service.h"
#include "exchange_api_handle.h"
#include "exchange_api_common.h"
#include "taler_signatures.h"
#include "exchange_api_curl_defaults.h"


/**
 * Information we track per deposited coin.
 */
struct Deposit
{
  /**
   * Coin's public key.
   */
  struct TALER_CoinSpendPublicKeyP coin_pub;

  /**
   * Signature made with the coin.
   */
  struct TALER_CoinSpendSignatureP coin_sig;

  /**
   * Coin's denomination.
   */
  struct TALER_DenominationHashP h_denom_pub;

  /**
   * Age restriction hash for the coin.
   */
  struct TALER_AgeCommitmentHash ahac;

  /**
   * How much did we say the coin contributed.
   */
  struct TALER_Amount contribution;
};


/**
 * @brief A purse create with deposit handle
 */
struct TALER_EXCHANGE_PurseCreateDepositHandle
{

  /**
   * The keys of the exchange this request handle will use
   */
  struct TALER_EXCHANGE_Keys *keys;

  /**
   * The url for this request.
   */
  char *url;

  /**
   * The base URL of the exchange.
   */
  char *exchange_url;

  /**
   * Context for #TEH_curl_easy_post(). Keeps the data that must
   * persist for Curl to make the upload.
   */
  struct TALER_CURL_PostContext ctx;

  /**
   * Handle for the request.
   */
  struct GNUNET_CURL_Job *job;

  /**
   * Function to call with the result.
   */
  TALER_EXCHANGE_PurseCreateDepositCallback cb;

  /**
   * Closure for @a cb.
   */
  void *cb_cls;

  /**
   * Expected value in the purse after fees.
   */
  struct TALER_Amount purse_value_after_fees;

  /**
   * Our encrypted contract (if we had any).
   */
  struct TALER_EncryptedContract econtract;

  /**
   * Public key of the merge capability.
   */
  struct TALER_PurseMergePublicKeyP merge_pub;

  /**
   * Public key of the purse.
   */
  struct TALER_PurseContractPublicKeyP purse_pub;

  /**
   * Signature with the purse key on the request.
   */
  struct TALER_PurseContractSignatureP purse_sig;

  /**
   * Hash over the purse's contract terms.
   */
  struct TALER_PrivateContractHashP h_contract_terms;

  /**
   * When does the purse expire.
   */
  struct GNUNET_TIME_Timestamp purse_expiration;

  /**
   * Array of @e num_deposit deposits.
   */
  struct Deposit *deposits;

  /**
   * How many deposits did we make?
   */
  unsigned int num_deposits;

};


/**
 * Function called when we're done processing the
 * HTTP /deposit request.
 *
 * @param cls the `struct TALER_EXCHANGE_DepositHandle`
 * @param response_code HTTP response code, 0 on error
 * @param response parsed JSON result, NULL on error
 */
static void
handle_purse_create_deposit_finished (void *cls,
                                      long response_code,
                                      const void *response)
{
  struct TALER_EXCHANGE_PurseCreateDepositHandle *pch = cls;
  const json_t *j = response;
  struct TALER_EXCHANGE_PurseCreateDepositResponse dr = {
    .hr.reply = j,
    .hr.http_status = (unsigned int) response_code
  };
  const struct TALER_EXCHANGE_Keys *keys = pch->keys;

  pch->job = NULL;
  switch (response_code)
  {
  case 0:
    dr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
    break;
  case MHD_HTTP_OK:
    {
      struct GNUNET_TIME_Timestamp etime;
      struct TALER_Amount total_deposited;
      struct TALER_ExchangeSignatureP exchange_sig;
      struct TALER_ExchangePublicKeyP exchange_pub;
      struct GNUNET_JSON_Specification spec[] = {
        GNUNET_JSON_spec_fixed_auto ("exchange_sig",
                                     &exchange_sig),
        GNUNET_JSON_spec_fixed_auto ("exchange_pub",
                                     &exchange_pub),
        GNUNET_JSON_spec_timestamp ("exchange_timestamp",
                                    &etime),
        TALER_JSON_spec_amount ("total_deposited",
                                pch->purse_value_after_fees.currency,
                                &total_deposited),
        GNUNET_JSON_spec_end ()
      };

      if (GNUNET_OK !=
          GNUNET_JSON_parse (j,
                             spec,
                             NULL, NULL))
      {
        GNUNET_break_op (0);
        dr.hr.http_status = 0;
        dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
        break;
      }
      if (GNUNET_OK !=
          TALER_EXCHANGE_test_signing_key (keys,
                                           &exchange_pub))
      {
        GNUNET_break_op (0);
        dr.hr.http_status = 0;
        dr.hr.ec = TALER_EC_EXCHANGE_PURSE_CREATE_EXCHANGE_SIGNATURE_INVALID;
        break;
      }
      if (GNUNET_OK !=
          TALER_exchange_online_purse_created_verify (
            etime,
            pch->purse_expiration,
            &pch->purse_value_after_fees,
            &total_deposited,
            &pch->purse_pub,
            &pch->h_contract_terms,
            &exchange_pub,
            &exchange_sig))
      {
        GNUNET_break_op (0);
        dr.hr.http_status = 0;
        dr.hr.ec = TALER_EC_EXCHANGE_PURSE_CREATE_EXCHANGE_SIGNATURE_INVALID;
        break;
      }
    }
    break;
  case MHD_HTTP_BAD_REQUEST:
    /* This should never happen, either us or the exchange is buggy
       (or API version conflict); just pass JSON reply to the application */
    dr.hr.ec = TALER_JSON_get_error_code (j);
    dr.hr.hint = TALER_JSON_get_error_hint (j);
    break;
  case MHD_HTTP_FORBIDDEN:
    dr.hr.ec = TALER_JSON_get_error_code (j);
    dr.hr.hint = TALER_JSON_get_error_hint (j);
    /* Nothing really to verify, exchange says one of the signatures is
       invalid; as we checked them, this should never happen, we
       should pass the JSON reply to the application */
    break;
  case MHD_HTTP_NOT_FOUND:
    dr.hr.ec = TALER_JSON_get_error_code (j);
    dr.hr.hint = TALER_JSON_get_error_hint (j);
    /* Nothing really to verify, this should never
       happen, we should pass the JSON reply to the application */
    break;
  case MHD_HTTP_CONFLICT:
    {
      dr.hr.ec = TALER_JSON_get_error_code (j);
      switch (dr.hr.ec)
      {
      case TALER_EC_EXCHANGE_PURSE_CREATE_CONFLICTING_META_DATA:
        if (GNUNET_OK !=
            TALER_EXCHANGE_check_purse_create_conflict_ (
              &pch->purse_sig,
              &pch->purse_pub,
              j))
        {
          GNUNET_break_op (0);
          dr.hr.http_status = 0;
          dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
          break;
        }
        break;
      case TALER_EC_EXCHANGE_GENERIC_INSUFFICIENT_FUNDS:
        /* Nothing to check anymore here, proof needs to be
           checked in the GET /coins/$COIN_PUB handler */
        break;
      case TALER_EC_EXCHANGE_GENERIC_COIN_CONFLICTING_DENOMINATION_KEY:
        // FIXME #7267: write check (add to exchange_api_common! */
        break;
      case TALER_EC_EXCHANGE_PURSE_DEPOSIT_CONFLICTING_META_DATA:
        {
          struct TALER_CoinSpendPublicKeyP coin_pub;
          struct TALER_CoinSpendSignatureP coin_sig;
          struct TALER_DenominationHashP h_denom_pub;
          struct TALER_AgeCommitmentHash phac;
          bool found = false;

          if (GNUNET_OK !=
              TALER_EXCHANGE_check_purse_coin_conflict_ (
                &pch->purse_pub,
                pch->exchange_url,
                j,
                &h_denom_pub,
                &phac,
                &coin_pub,
                &coin_sig))
          {
            GNUNET_break_op (0);
            dr.hr.http_status = 0;
            dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
            break;
          }
          for (unsigned int i = 0; i<pch->num_deposits; i++)
          {
            struct Deposit *deposit = &pch->deposits[i];

            if (0 !=
                GNUNET_memcmp (&coin_pub,
                               &deposit->coin_pub))
              continue;
            if (0 !=
                GNUNET_memcmp (&deposit->h_denom_pub,
                               &h_denom_pub))
            {
              found = true;
              break;
            }
            if (0 !=
                GNUNET_memcmp (&deposit->ahac,
                               &phac))
            {
              found = true;
              break;
            }
            if (0 ==
                GNUNET_memcmp (&coin_sig,
                               &deposit->coin_sig))
            {
              GNUNET_break_op (0);
              continue;
            }
            found = true;
            break;
          }
          if (! found)
          {
            /* conflict is for a different coin! */
            GNUNET_break_op (0);
            dr.hr.http_status = 0;
            dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
            break;
          }
        }
      case TALER_EC_EXCHANGE_PURSE_ECONTRACT_CONFLICTING_META_DATA:
        if (GNUNET_OK !=
            TALER_EXCHANGE_check_purse_econtract_conflict_ (
              &pch->econtract.econtract_sig,
              &pch->purse_pub,
              j))
        {
          GNUNET_break_op (0);
          dr.hr.http_status = 0;
          dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
          break;
        }
        break;
      default:
        GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                    "Unexpected error code %d for conflcting deposit\n",
                    dr.hr.ec);
        GNUNET_break_op (0);
        dr.hr.http_status = 0;
        dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
      }
    }
    break;
  case MHD_HTTP_GONE:
    /* could happen if denomination was revoked */
    /* Note: one might want to check /keys for revocation
       signature here, alas tricky in case our /keys
       is outdated => left to clients */
    dr.hr.ec = TALER_JSON_get_error_code (j);
    dr.hr.hint = TALER_JSON_get_error_hint (j);
    break;
  case MHD_HTTP_INTERNAL_SERVER_ERROR:
    dr.hr.ec = TALER_JSON_get_error_code (j);
    dr.hr.hint = TALER_JSON_get_error_hint (j);
    /* Server had an internal issue; we should retry, but this API
       leaves this to the application */
    break;
  default:
    /* unexpected response code */
    dr.hr.ec = TALER_JSON_get_error_code (j);
    dr.hr.hint = TALER_JSON_get_error_hint (j);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Unexpected response code %u/%d for exchange deposit\n",
                (unsigned int) response_code,
                dr.hr.ec);
    GNUNET_break_op (0);
    break;
  }
  pch->cb (pch->cb_cls,
           &dr);
  TALER_EXCHANGE_purse_create_with_deposit_cancel (pch);
}


struct TALER_EXCHANGE_PurseCreateDepositHandle *
TALER_EXCHANGE_purse_create_with_deposit (
  struct GNUNET_CURL_Context *ctx,
  const char *url,
  struct TALER_EXCHANGE_Keys *keys,
  const struct TALER_PurseContractPrivateKeyP *purse_priv,
  const struct TALER_PurseMergePrivateKeyP *merge_priv,
  const struct TALER_ContractDiffiePrivateP *contract_priv,
  const json_t *contract_terms,
  unsigned int num_deposits,
  const struct TALER_EXCHANGE_PurseDeposit deposits[static num_deposits],
  bool upload_contract,
  TALER_EXCHANGE_PurseCreateDepositCallback cb,
  void *cb_cls)
{
  struct TALER_EXCHANGE_PurseCreateDepositHandle *pch;
  json_t *create_obj;
  json_t *deposit_arr;
  CURL *eh;
  char arg_str[sizeof (pch->purse_pub) * 2 + 32];
  uint32_t min_age = 0;

  pch = GNUNET_new (struct TALER_EXCHANGE_PurseCreateDepositHandle);
  pch->cb = cb;
  pch->cb_cls = cb_cls;
  {
    struct GNUNET_JSON_Specification spec[] = {
      GNUNET_JSON_spec_timestamp ("pay_deadline",
                                  &pch->purse_expiration),
      TALER_JSON_spec_amount_any ("amount",
                                  &pch->purse_value_after_fees),
      GNUNET_JSON_spec_mark_optional (
        GNUNET_JSON_spec_uint32 ("minimum_age",
                                 &min_age),
        NULL),
      GNUNET_JSON_spec_end ()
    };

    if (GNUNET_OK !=
        GNUNET_JSON_parse (contract_terms,
                           spec,
                           NULL, NULL))
    {
      GNUNET_break (0);
      return NULL;
    }
  }
  if (GNUNET_OK !=
      TALER_JSON_contract_hash (contract_terms,
                                &pch->h_contract_terms))
  {
    GNUNET_break (0);
    return NULL;
  }
  GNUNET_CRYPTO_eddsa_key_get_public (&purse_priv->eddsa_priv,
                                      &pch->purse_pub.eddsa_pub);
  {
    char pub_str[sizeof (pch->purse_pub) * 2];
    char *end;

    end = GNUNET_STRINGS_data_to_string (
      &pch->purse_pub,
      sizeof (pch->purse_pub),
      pub_str,
      sizeof (pub_str));
    *end = '\0';
    GNUNET_snprintf (arg_str,
                     sizeof (arg_str),
                     "purses/%s/create",
                     pub_str);
  }
  GNUNET_CRYPTO_eddsa_key_get_public (&merge_priv->eddsa_priv,
                                      &pch->merge_pub.eddsa_pub);
  pch->url = TALER_url_join (url,
                             arg_str,
                             NULL);
  if (NULL == pch->url)
  {
    GNUNET_break (0);
    GNUNET_free (pch);
    return NULL;
  }
  pch->num_deposits = num_deposits;
  pch->deposits = GNUNET_new_array (num_deposits,
                                    struct Deposit);
  deposit_arr = json_array ();
  GNUNET_assert (NULL != deposit_arr);
  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "Signing with URL `%s'\n",
              url);
  for (unsigned int i = 0; i<num_deposits; i++)
  {
    const struct TALER_EXCHANGE_PurseDeposit *deposit = &deposits[i];
    const struct TALER_AgeCommitmentProof *acp = deposit->age_commitment_proof;
    struct Deposit *d = &pch->deposits[i];
    json_t *jdeposit;
    struct TALER_AgeCommitmentHash *aghp = NULL;
    struct TALER_AgeAttestation attest;
    struct TALER_AgeAttestation *attestp = NULL;

    if (NULL != acp)
    {
      TALER_age_commitment_hash (&acp->commitment,
                                 &d->ahac);
      aghp = &d->ahac;
      if (GNUNET_OK !=
          TALER_age_commitment_attest (acp,
                                       min_age,
                                       &attest))
      {
        GNUNET_break (0);
        GNUNET_array_grow (pch->deposits,
                           pch->num_deposits,
                           0);
        GNUNET_free (pch->url);
        json_decref (deposit_arr);
        GNUNET_free (pch);
        return NULL;
      }
    }
    d->contribution = deposit->amount;
    d->h_denom_pub = deposit->h_denom_pub;
    GNUNET_CRYPTO_eddsa_key_get_public (&deposit->coin_priv.eddsa_priv,
                                        &d->coin_pub.eddsa_pub);
    TALER_wallet_purse_deposit_sign (
      url,
      &pch->purse_pub,
      &deposit->amount,
      &d->h_denom_pub,
      &d->ahac,
      &deposit->coin_priv,
      &d->coin_sig);
    jdeposit = GNUNET_JSON_PACK (
      GNUNET_JSON_pack_allow_null (
        GNUNET_JSON_pack_data_auto ("h_age_commitment",
                                    aghp)),
      GNUNET_JSON_pack_allow_null (
        GNUNET_JSON_pack_data_auto ("age_attestation",
                                    attestp)),
      TALER_JSON_pack_amount ("amount",
                              &deposit->amount),
      GNUNET_JSON_pack_data_auto ("denom_pub_hash",
                                  &deposit->h_denom_pub),
      TALER_JSON_pack_denom_sig ("ub_sig",
                                 &deposit->denom_sig),
      GNUNET_JSON_pack_data_auto ("coin_sig",
                                  &d->coin_sig),
      GNUNET_JSON_pack_data_auto ("coin_pub",
                                  &d->coin_pub));
    GNUNET_assert (0 ==
                   json_array_append_new (deposit_arr,
                                          jdeposit));
  }
  TALER_wallet_purse_create_sign (pch->purse_expiration,
                                  &pch->h_contract_terms,
                                  &pch->merge_pub,
                                  min_age,
                                  &pch->purse_value_after_fees,
                                  purse_priv,
                                  &pch->purse_sig);
  if (upload_contract)
  {
    TALER_CRYPTO_contract_encrypt_for_merge (&pch->purse_pub,
                                             contract_priv,
                                             merge_priv,
                                             contract_terms,
                                             &pch->econtract.econtract,
                                             &pch->econtract.econtract_size);
    GNUNET_CRYPTO_ecdhe_key_get_public (&contract_priv->ecdhe_priv,
                                        &pch->econtract.contract_pub.ecdhe_pub);
    TALER_wallet_econtract_upload_sign (pch->econtract.econtract,
                                        pch->econtract.econtract_size,
                                        &pch->econtract.contract_pub,
                                        purse_priv,
                                        &pch->econtract.econtract_sig);
  }
  create_obj = GNUNET_JSON_PACK (
    TALER_JSON_pack_amount ("amount",
                            &pch->purse_value_after_fees),
    GNUNET_JSON_pack_uint64 ("min_age",
                             min_age),
    GNUNET_JSON_pack_allow_null (
      TALER_JSON_pack_econtract ("econtract",
                                 upload_contract
                                 ? &pch->econtract
                                 : NULL)),
    GNUNET_JSON_pack_data_auto ("purse_sig",
                                &pch->purse_sig),
    GNUNET_JSON_pack_data_auto ("merge_pub",
                                &pch->merge_pub),
    GNUNET_JSON_pack_data_auto ("h_contract_terms",
                                &pch->h_contract_terms),
    GNUNET_JSON_pack_timestamp ("purse_expiration",
                                pch->purse_expiration),
    GNUNET_JSON_pack_array_steal ("deposits",
                                  deposit_arr));
  GNUNET_assert (NULL != create_obj);
  eh = TALER_EXCHANGE_curl_easy_get_ (pch->url);
  if ( (NULL == eh) ||
       (GNUNET_OK !=
        TALER_curl_easy_post (&pch->ctx,
                              eh,
                              create_obj)) )
  {
    GNUNET_break (0);
    if (NULL != eh)
      curl_easy_cleanup (eh);
    json_decref (create_obj);
    GNUNET_free (pch->econtract.econtract);
    GNUNET_array_grow (pch->deposits,
                       pch->num_deposits,
                       0);
    GNUNET_free (pch->url);
    GNUNET_free (pch);
    return NULL;
  }
  json_decref (create_obj);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "URL for purse create with deposit: `%s'\n",
              pch->url);
  pch->keys = TALER_EXCHANGE_keys_incref (keys);
  pch->exchange_url = GNUNET_strdup (url);
  pch->job = GNUNET_CURL_job_add2 (ctx,
                                   eh,
                                   pch->ctx.headers,
                                   &handle_purse_create_deposit_finished,
                                   pch);
  return pch;
}


void
TALER_EXCHANGE_purse_create_with_deposit_cancel (
  struct TALER_EXCHANGE_PurseCreateDepositHandle *pch)
{
  if (NULL != pch->job)
  {
    GNUNET_CURL_job_cancel (pch->job);
    pch->job = NULL;
  }
  GNUNET_free (pch->econtract.econtract);
  GNUNET_free (pch->exchange_url);
  GNUNET_free (pch->url);
  GNUNET_array_grow (pch->deposits,
                     pch->num_deposits,
                     0);
  TALER_EXCHANGE_keys_decref (pch->keys);
  TALER_curl_easy_post_finished (&pch->ctx);
  GNUNET_free (pch);
}


/* end of exchange_api_purse_create_with_deposit.c */