aboutsummaryrefslogtreecommitdiff
path: root/src/mint/taler-mint-keyup.c
blob: 35a4c041080f04c4bd0bca799c93d56325958e6d (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
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
/*
  This file is part of TALER
  (C) 2014 Christian Grothoff (and other contributing authors)

  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, If not, see <http://www.gnu.org/licenses/>
*/

/**
 * @file taler-mint-keyup.c
 * @brief Update the mint's keys for coins and signatures,
 *        using the mint's offline master key.
 * @author Florian Dold
 * @author Benedikt Mueller
 */

#include <platform.h>
#include <gnunet/gnunet_util_lib.h>
#include "taler_util.h"
#include "taler_signatures.h"
#include "mint.h"
#include "key_io.h"

/**
 * FIXME: allow user to specify (within reason).
 */
#define RSA_KEYSIZE 2048

#define HASH_CUTOFF 20

/**
 * Macro to round microseconds to seconds in GNUNET_TIME_* structs.
 */
#define ROUND_TO_SECS(name,us_field) name.us_field -= name.us_field % (1000 * 1000);


GNUNET_NETWORK_STRUCT_BEGIN

struct CoinTypeNBO
{
  struct GNUNET_TIME_RelativeNBO duration_spend;
  struct GNUNET_TIME_RelativeNBO duration_withdraw;
  struct TALER_AmountNBO value;
  struct TALER_AmountNBO fee_withdraw;
  struct TALER_AmountNBO fee_deposit;
  struct TALER_AmountNBO fee_refresh;
};

GNUNET_NETWORK_STRUCT_END

struct CoinTypeParams
{
  struct GNUNET_TIME_Relative duration_spend;
  struct GNUNET_TIME_Relative duration_withdraw;
  struct GNUNET_TIME_Relative duration_overlap;
  struct TALER_Amount value;
  struct TALER_Amount fee_withdraw;
  struct TALER_Amount fee_deposit;
  struct TALER_Amount fee_refresh;
  struct GNUNET_TIME_Absolute anchor;
};


/**
 * Filename of the master private key.
 */
static char *masterkeyfile;

/**
 * Director of the mint, containing the keys.
 */
static char *mintdir;

/**
 * Time to pretend when the key update is executed.
 */
static char *pretend_time_str;

/**
 * Handle to the mint's configuration
 */
static struct GNUNET_CONFIGURATION_Handle *kcfg;

/**
 * Time when the key update is executed.  Either the actual current time, or a
 * pretended time.
 */
static struct GNUNET_TIME_Absolute now;

/**
 * Master private key of the mint.
 */
static struct GNUNET_CRYPTO_EddsaPrivateKey *master_priv;

/**
 * Master public key of the mint.
 */
static struct GNUNET_CRYPTO_EddsaPublicKey *master_pub;

/**
 * Until what time do we provide keys?
 */
static struct GNUNET_TIME_Absolute lookahead_sign_stamp;


static int
config_get_denom (const char *section, const char *option, struct TALER_Amount *denom)
{
  char *str;
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (kcfg, section, option, &str))
    return GNUNET_NO;
  if (GNUNET_OK != TALER_string_to_amount (str, denom))
    return GNUNET_SYSERR;
  return GNUNET_OK;
}


static char *
get_signkey_dir ()
{
  char *dir;
  size_t len;
  len = GNUNET_asprintf (&dir, ("%s" DIR_SEPARATOR_STR DIR_SIGNKEYS), mintdir);
  GNUNET_assert (len > 0);
  return dir;
}


static char *
get_signkey_file (struct GNUNET_TIME_Absolute start)
{
  char *dir;
  size_t len;
  len = GNUNET_asprintf (&dir, ("%s" DIR_SEPARATOR_STR DIR_SIGNKEYS DIR_SEPARATOR_STR "%llu"),
                         mintdir, (long long) start.abs_value_us);
  GNUNET_assert (len > 0);
  return dir;
}


/**
 * Hash the data defining the coin type.
 * Exclude information that may not be the same for all
 * instances of the coin type (i.e. the anchor, overlap).
 */
static void
hash_coin_type (const struct CoinTypeParams *p, struct GNUNET_HashCode *hash)
{
  struct CoinTypeNBO p_nbo;

  memset (&p_nbo, 0, sizeof (struct CoinTypeNBO));

  p_nbo.duration_spend = GNUNET_TIME_relative_hton (p->duration_spend);
  p_nbo.duration_withdraw = GNUNET_TIME_relative_hton (p->duration_withdraw);
  p_nbo.value = TALER_amount_hton (p->value);
  p_nbo.fee_withdraw = TALER_amount_hton (p->fee_withdraw);
  p_nbo.fee_deposit = TALER_amount_hton (p->fee_deposit);
  p_nbo.fee_refresh = TALER_amount_hton (p->fee_refresh);

  GNUNET_CRYPTO_hash (&p_nbo, sizeof (struct CoinTypeNBO), hash);
}


static const char *
get_cointype_dir (const struct CoinTypeParams *p)
{
  static char dir[4096];
  size_t len;
  struct GNUNET_HashCode hash;
  char *hash_str;
  char *val_str;
  unsigned int i;

  hash_coin_type (p, &hash);
  hash_str = GNUNET_STRINGS_data_to_string_alloc (&hash,
                                                  sizeof (struct GNUNET_HashCode));
  GNUNET_assert (HASH_CUTOFF <= strlen (hash_str) + 1);
  GNUNET_assert (NULL != hash_str);
  hash_str[HASH_CUTOFF] = 0;

  val_str = TALER_amount_to_string (p->value);
  for (i = 0; i < strlen (val_str); i++)
    if (':' == val_str[i] || '.' == val_str[i])
      val_str[i] = '_';

  len = GNUNET_snprintf (dir, sizeof (dir),
                         ("%s" DIR_SEPARATOR_STR DIR_DENOMKEYS DIR_SEPARATOR_STR "%s-%s"),
                         mintdir, val_str, hash_str);
  GNUNET_assert (len > 0);
  GNUNET_free (hash_str);
  return dir;
}


static const char *
get_cointype_file (struct CoinTypeParams *p,
                   struct GNUNET_TIME_Absolute start)
{
  const char *dir;
  static char filename[4096];
  size_t len;
  dir = get_cointype_dir (p);
  len = GNUNET_snprintf (filename, sizeof (filename), ("%s" DIR_SEPARATOR_STR "%llu"),
                         dir, (unsigned long long) start.abs_value_us);
  GNUNET_assert (len > 0);
  return filename;
}


/**
 * Get the latest key file from the past.
 *
 * @param cls closure
 * @param filename complete filename (absolute path)
 * @return #GNUNET_OK to continue to iterate,
 *  #GNUNET_NO to stop iteration with no error,
 *  #GNUNET_SYSERR to abort iteration with error!
 */
static int
get_anchor_iter (void *cls,
                 const char *filename)
{
  struct GNUNET_TIME_Absolute stamp;
  struct GNUNET_TIME_Absolute *anchor = cls;
  const char *base;
  char *end = NULL;

  base = GNUNET_STRINGS_get_short_name (filename);
  stamp.abs_value_us = strtol (base, &end, 10);

  if ((NULL == end) || (0 != *end))
  {
    fprintf(stderr, "Ignoring unexpected file '%s'.\n", filename);
    return GNUNET_OK;
  }

  // TODO: check if it's actually a valid key file

  if ((stamp.abs_value_us <= now.abs_value_us) && (stamp.abs_value_us > anchor->abs_value_us))
    *anchor = stamp;

  return GNUNET_OK;
}


/**
 * Get the timestamp where the first new key should be generated.
 * Relies on correctly named key files.
 *
 * @param dir directory with the signed stuff
 * @param duration how long is one key valid?
 * @param overlap what's the overlap between the keys validity period?
 * @param[out] anchor the timestamp where the first new key should be generated
 */
static void
get_anchor (const char *dir,
            struct GNUNET_TIME_Relative duration,
            struct GNUNET_TIME_Relative overlap,
            struct GNUNET_TIME_Absolute *anchor)
{
  GNUNET_assert (0 == duration.rel_value_us % 1000000);
  GNUNET_assert (0 == overlap.rel_value_us % 1000000);
  if (GNUNET_YES != GNUNET_DISK_directory_test (dir, GNUNET_YES))
  {
    *anchor = now;
    printf ("Can't look for anchor (%s)\n", dir);
    return;
  }

  *anchor = GNUNET_TIME_UNIT_ZERO_ABS;
  if (-1 == GNUNET_DISK_directory_scan (dir, &get_anchor_iter, anchor))
  {
    *anchor = now;
    return;
  }

  if ((GNUNET_TIME_absolute_add (*anchor, duration)).abs_value_us < now.abs_value_us)
  {
    // there's no good anchor, start from now
    // (existing keys are too old)
    *anchor = now;
  }
  else if (anchor->abs_value_us != now.abs_value_us)
  {
    // we have a good anchor
    *anchor = GNUNET_TIME_absolute_add (*anchor, duration);
    *anchor = GNUNET_TIME_absolute_subtract (*anchor, overlap);
  }
  // anchor is now the stamp where we need to create a new key
}


static void
create_signkey_issue_priv (struct GNUNET_TIME_Absolute start,
                           struct GNUNET_TIME_Relative duration,
                           struct TALER_MINT_SignKeyIssuePriv *pi)
{
  struct GNUNET_CRYPTO_EddsaPrivateKey *priv;
  struct TALER_MINT_SignKeyIssue *issue = &pi->issue;

  priv = GNUNET_CRYPTO_eddsa_key_create ();
  GNUNET_assert (NULL != priv);
  pi->signkey_priv = *priv;
  GNUNET_free (priv);
  issue->master_pub = *master_pub;
  issue->start = GNUNET_TIME_absolute_hton (start);
  issue->expire = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_add (start, duration));

  GNUNET_CRYPTO_eddsa_key_get_public (&pi->signkey_priv, &issue->signkey_pub);

  issue->purpose.purpose = htonl (TALER_SIGNATURE_MASTER_SIGNKEY);
  issue->purpose.size = htonl (sizeof (struct TALER_MINT_SignKeyIssue) - offsetof (struct TALER_MINT_SignKeyIssue, purpose));

  if (GNUNET_OK != GNUNET_CRYPTO_eddsa_sign (master_priv, &issue->purpose, &issue->signature))
  {
    GNUNET_abort ();
  }
}


static int
check_signkey_valid (const char *signkey_filename)
{
  // FIXME: do real checks
  return GNUNET_OK;
}


static int
mint_keys_update_signkeys ()
{
  struct GNUNET_TIME_Relative signkey_duration;
  struct GNUNET_TIME_Absolute anchor;
  char *signkey_dir;

  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_time (kcfg, "mint_keys", "signkey_duration", &signkey_duration))
  {
    fprintf (stderr, "Can't read config value mint_keys.signkey_duration\n");
    return GNUNET_SYSERR;
  }
  ROUND_TO_SECS (signkey_duration, rel_value_us);
  signkey_dir = get_signkey_dir ();
  // make sure the directory exists
  if (GNUNET_OK != GNUNET_DISK_directory_create (signkey_dir))
  {
    fprintf (stderr, "Cant create signkey dir\n");
    return GNUNET_SYSERR;
  }

  get_anchor (signkey_dir, signkey_duration, GNUNET_TIME_UNIT_ZERO, &anchor);

  while (anchor.abs_value_us < lookahead_sign_stamp.abs_value_us) {
    char *skf;
    skf = get_signkey_file (anchor);
    if (GNUNET_YES != GNUNET_DISK_file_test (skf))
    {
      struct TALER_MINT_SignKeyIssuePriv signkey_issue;
      ssize_t nwrite;
      printf ("Generating signing key for %s.\n",
              GNUNET_STRINGS_absolute_time_to_string (anchor));
      create_signkey_issue_priv (anchor, signkey_duration, &signkey_issue);
      nwrite = GNUNET_DISK_fn_write (skf, &signkey_issue, sizeof (struct TALER_MINT_SignKeyIssue),
                                     (GNUNET_DISK_PERM_USER_WRITE | GNUNET_DISK_PERM_USER_READ));
      if (nwrite != sizeof (struct TALER_MINT_SignKeyIssue))
      {
        fprintf (stderr, "Can't write to file '%s'\n", skf);
        return GNUNET_SYSERR;
      }
    }
    else if (GNUNET_OK != check_signkey_valid (skf))
    {
      return GNUNET_SYSERR;
    }
    anchor = GNUNET_TIME_absolute_add (anchor, signkey_duration);
  }
  return GNUNET_OK;
}


static int
get_cointype_params (const char *ct, struct CoinTypeParams *params)
{
  const char *dir;
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_time (kcfg, "mint_denom_duration_withdraw", ct, &params->duration_withdraw))
  {
    fprintf (stderr, "Withdraw duration not given for coin type '%s'\n", ct);
    return GNUNET_SYSERR;
  }
  ROUND_TO_SECS (params->duration_withdraw, rel_value_us);
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_time (kcfg, "mint_denom_duration_spend", ct, &params->duration_spend))
  {
    fprintf (stderr, "Spend duration not given for coin type '%s'\n", ct);
    return GNUNET_SYSERR;
  }
  ROUND_TO_SECS (params->duration_spend, rel_value_us);
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_time (kcfg, "mint_denom_duration_overlap", ct, &params->duration_overlap))
  {
    fprintf (stderr, "Overlap duration not given for coin type '%s'\n", ct);
    return GNUNET_SYSERR;
  }
  ROUND_TO_SECS (params->duration_overlap, rel_value_us);

  if (GNUNET_OK != config_get_denom ("mint_denom_value", ct, &params->value))
  {
    fprintf (stderr, "Value not given for coin type '%s'\n", ct);
    return GNUNET_SYSERR;
  }

  if (GNUNET_OK != config_get_denom ("mint_denom_fee_withdraw", ct, &params->fee_withdraw))
  {
    fprintf (stderr, "Withdraw fee not given for coin type '%s'\n", ct);
    return GNUNET_SYSERR;
  }

  if (GNUNET_OK != config_get_denom ("mint_denom_fee_deposit", ct, &params->fee_deposit))
  {
    fprintf (stderr, "Deposit fee not given for coin type '%s'\n", ct);
    return GNUNET_SYSERR;
  }

  if (GNUNET_OK != config_get_denom ("mint_denom_fee_refresh", ct, &params->fee_refresh))
  {
    fprintf (stderr, "Deposit fee not given for coin type '%s'\n", ct);
    return GNUNET_SYSERR;
  }

  dir = get_cointype_dir (params);
  get_anchor (dir, params->duration_spend, params->duration_overlap, &params->anchor);
  return GNUNET_OK;
}


static void
create_denomkey_issue (struct CoinTypeParams *params,
                       struct TALER_MINT_DenomKeyIssuePriv *dki)
{
  GNUNET_assert (NULL != (dki->denom_priv = GNUNET_CRYPTO_rsa_private_key_create (RSA_KEYSIZE)));
  dki->issue.denom_pub = GNUNET_CRYPTO_rsa_private_key_get_public (dki->denom_priv);
  dki->issue.master = *master_pub;
  dki->issue.start = GNUNET_TIME_absolute_hton (params->anchor);
  dki->issue.expire_withdraw =
      GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_add (params->anchor,
                                                           params->duration_withdraw));
  dki->issue.expire_spend =
    GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_add (params->anchor,
                                                           params->duration_spend));
  dki->issue.value = TALER_amount_hton (params->value);
  dki->issue.fee_withdraw = TALER_amount_hton (params->fee_withdraw);
  dki->issue.fee_deposit = TALER_amount_hton (params->fee_deposit);
  dki->issue.fee_refresh = TALER_amount_hton (params->fee_refresh);

  dki->issue.purpose.purpose = htonl (TALER_SIGNATURE_MASTER_DENOM);
  dki->issue.purpose.size = htonl (sizeof (struct TALER_MINT_DenomKeyIssuePriv) - offsetof (struct TALER_MINT_DenomKeyIssuePriv, issue.purpose));

  if (GNUNET_OK !=
      GNUNET_CRYPTO_eddsa_sign (master_priv,
                                &dki->issue.purpose,
                                &dki->issue.signature))
    {
    GNUNET_abort ();
  }
}


static int
check_cointype_valid (const char *filename, struct CoinTypeParams *params)
{
  // FIXME: add real checks
  return GNUNET_OK;
}


static int
mint_keys_update_cointype (const char *coin_alias)
{
  struct CoinTypeParams p;
  const char *cointype_dir;

  if (GNUNET_OK != get_cointype_params (coin_alias, &p))
    return GNUNET_SYSERR;

  cointype_dir = get_cointype_dir (&p);
  if (GNUNET_OK != GNUNET_DISK_directory_create (cointype_dir))
    return GNUNET_SYSERR;

  while (p.anchor.abs_value_us < lookahead_sign_stamp.abs_value_us) {
    const char *dkf;
    dkf = get_cointype_file (&p, p.anchor);

    if (GNUNET_YES != GNUNET_DISK_file_test (dkf))
    {
      struct TALER_MINT_DenomKeyIssuePriv denomkey_issue;
      int ret;
      printf ("Generating denomination key for type '%s', start %s.\n",
              coin_alias,
              GNUNET_STRINGS_absolute_time_to_string (p.anchor));
      printf ("Target path: %s\n", dkf);
      create_denomkey_issue (&p, &denomkey_issue);
      ret = TALER_MINT_write_denom_key (dkf, &denomkey_issue);
      GNUNET_CRYPTO_rsa_private_key_free (denomkey_issue.denom_priv);
      if (GNUNET_OK != ret)
      {
        fprintf (stderr, "Can't write to file '%s'\n", dkf);
        return GNUNET_SYSERR;
      }
    }
    else if (GNUNET_OK != check_cointype_valid (dkf, &p))
    {
      return GNUNET_SYSERR;
    }
    p.anchor = GNUNET_TIME_absolute_add (p.anchor, p.duration_spend);
    p.anchor = GNUNET_TIME_absolute_subtract (p.anchor, p.duration_overlap);
  }
  return GNUNET_OK;
}


static int
mint_keys_update_denomkeys ()
{
  char *coin_types;
  char *ct;
  char *tok_ctx;

  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (kcfg, "mint_keys", "coin_types", &coin_types))
  {
    fprintf (stderr, "mint_keys.coin_types not in configuration\n");
    return GNUNET_SYSERR;
  }

  for (ct = strtok_r (coin_types, " ", &tok_ctx);
       ct != NULL;
       ct = strtok_r (NULL, " ", &tok_ctx))
  {
    if (GNUNET_OK != mint_keys_update_cointype (ct))
    {
      GNUNET_free (coin_types);
      return GNUNET_SYSERR;
    }
  }
  GNUNET_free (coin_types);
  return GNUNET_OK;
}


static int
mint_keys_update ()
{
  int ret;
  struct GNUNET_TIME_Relative lookahead_sign;
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_time (kcfg, "mint_keys", "lookahead_sign", &lookahead_sign))
  {
    fprintf (stderr, "mint_keys.lookahead_sign not found\n");
    return GNUNET_SYSERR;
  }
  if (lookahead_sign.rel_value_us == 0)
  {
    fprintf (stderr, "mint_keys.lookahead_sign must not be zero\n");
    return GNUNET_SYSERR;
  }
  ROUND_TO_SECS (lookahead_sign, rel_value_us);
  lookahead_sign_stamp = GNUNET_TIME_absolute_add (now, lookahead_sign);

  ret = mint_keys_update_signkeys ();
  if (GNUNET_OK != ret)
    return GNUNET_SYSERR;

  return mint_keys_update_denomkeys ();
}


/**
 * The main function of the keyup tool
 *
 * @param argc number of arguments from the command line
 * @param argv command line arguments
 * @return 0 ok, 1 on error
 */
int
main (int argc, char *const *argv)
{
  static const struct GNUNET_GETOPT_CommandLineOption options[] = {
    GNUNET_GETOPT_OPTION_HELP ("gnunet-mint-keyup OPTIONS"),
    {'m', "master-key", "FILE",
     "master key file (private key)", 1,
     &GNUNET_GETOPT_set_filename, &masterkeyfile},
    {'d', "mint-dir", "DIR",
     "mint directory with keys to update", 1,
     &GNUNET_GETOPT_set_filename, &mintdir},
    {'t', "time", "TIMESTAMP",
     "pretend it is a different time for the update", 0,
     &GNUNET_GETOPT_set_string, &pretend_time_str},
    GNUNET_GETOPT_OPTION_END
  };

  GNUNET_assert (GNUNET_OK == GNUNET_log_setup ("taler-mint-keyup", "WARNING", NULL));

  if (GNUNET_GETOPT_run ("taler-mint-keyup", options, argc, argv) < 0)
    return 1;
  if (NULL == mintdir)
  {
    fprintf (stderr, "mint directory not given\n");
    return 1;
  }

  if (NULL != pretend_time_str)
  {
    if (GNUNET_OK != GNUNET_STRINGS_fancy_time_to_absolute (pretend_time_str, &now))
    {
      fprintf (stderr, "timestamp invalid\n");
      return 1;
    }
  }
  else
  {
    now = GNUNET_TIME_absolute_get ();
  }
  ROUND_TO_SECS (now, abs_value_us);

  kcfg = TALER_config_load (mintdir);
  if (NULL == kcfg)
  {
    fprintf (stderr, "can't load mint configuration\n");
    return 1;
  }

  if (NULL == masterkeyfile)
  {
    fprintf (stderr, "master key file not given\n");
    return 1;
  }
  master_priv = GNUNET_CRYPTO_eddsa_key_create_from_file (masterkeyfile);
  if (NULL == master_priv)
  {
    fprintf (stderr, "master key invalid\n");
    return 1;
  }

  master_pub = GNUNET_new (struct GNUNET_CRYPTO_EddsaPublicKey);
  GNUNET_CRYPTO_eddsa_key_get_public (master_priv, master_pub);

  // check if key from file matches the one from the configuration
  {
    struct GNUNET_CRYPTO_EddsaPublicKey master_pub_from_cfg;
    if (GNUNET_OK !=
        GNUNET_CONFIGURATION_get_data (kcfg, "mint", "master_pub",
                                       &master_pub_from_cfg,
                                       sizeof (struct GNUNET_CRYPTO_EddsaPublicKey)))
    {
      fprintf (stderr, "master key missing in configuration (mint.master_pub)\n");
      return 1;
    }
    if (0 != memcmp (master_pub, &master_pub_from_cfg, sizeof (struct GNUNET_CRYPTO_EddsaPublicKey)))
    {
      fprintf (stderr, "Mismatch between key from mint configuration and master private key file from command line.\n");
      return 1;
    }
  }

  if (GNUNET_OK != mint_keys_update ())
    return 1;
  return 0;
}