scd/iso7816.c

   1 /* iso7816.c - ISO 7816 commands
   2  * Copyright (C) 2003, 2004, 2008, 2009 Free Software Foundation, Inc.
   3  *
   4  * This file is part of GnuPG.
   5  *
   6  * GnuPG is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * GnuPG is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  *
  19  * $Id$
  20  */
  21
  22 #include <config.h>
  23 #include <errno.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #if defined(GNUPG_SCD_MAIN_HEADER)
  29 #include GNUPG_SCD_MAIN_HEADER
  30 #elif GNUPG_MAJOR_VERSION == 1
  31 /* This is used with GnuPG version < 1.9.  The code has been source
  32    copied from the current GnuPG >= 1.9  and is maintained over
  33    there. */
  34 #include "options.h"
  35 #include "errors.h"
  36 #include "memory.h"
  37 #include "util.h"
  38 #include "i18n.h"
  39 #else /* GNUPG_MAJOR_VERSION != 1 */
  40 #include "scdaemon.h"
  41 #endif /* GNUPG_MAJOR_VERSION != 1 */
  42
  43 #include "iso7816.h"
  44 #include "apdu.h"
  45
  46
  47 #define CMD_SELECT_FILE 0xA4
  48 #define CMD_VERIFY                ISO7816_VERIFY
  49 #define CMD_CHANGE_REFERENCE_DATA ISO7816_CHANGE_REFERENCE_DATA
  50 #define CMD_RESET_RETRY_COUNTER   ISO7816_RESET_RETRY_COUNTER
  51 #define CMD_GET_DATA    0xCA
  52 #define CMD_PUT_DATA    0xDA
  53 #define CMD_MSE         0x22
  54 #define CMD_PSO         0x2A
  55 #define CMD_INTERNAL_AUTHENTICATE 0x88
  56 #define CMD_GENERATE_KEYPAIR      0x47
  57 #define CMD_GET_CHALLENGE         0x84
  58 #define CMD_READ_BINARY 0xB0
  59 #define CMD_READ_RECORD 0xB2
  60
  61 static gpg_error_t
  62 map_sw (int sw)
  63 {
  64   gpg_err_code_t ec;
  65
  66   switch (sw)
  67     {
  68     case SW_EEPROM_FAILURE: ec = GPG_ERR_HARDWARE; break;
  69     case SW_TERM_STATE:     ec = GPG_ERR_CARD; break;
  70     case SW_WRONG_LENGTH:   ec = GPG_ERR_INV_VALUE; break;
  71     case SW_SM_NOT_SUP:     ec = GPG_ERR_NOT_SUPPORTED; break;
  72     case SW_CC_NOT_SUP:     ec = GPG_ERR_NOT_SUPPORTED; break;
  73     case SW_CHV_WRONG:      ec = GPG_ERR_BAD_PIN; break;
  74     case SW_CHV_BLOCKED:    ec = GPG_ERR_PIN_BLOCKED; break;
  75     case SW_USE_CONDITIONS: ec = GPG_ERR_USE_CONDITIONS; break;
  76     case SW_NOT_SUPPORTED:  ec = GPG_ERR_NOT_SUPPORTED; break;
  77     case SW_BAD_PARAMETER:  ec = GPG_ERR_INV_VALUE; break;
  78     case SW_FILE_NOT_FOUND: ec = GPG_ERR_ENOENT; break;
  79     case SW_RECORD_NOT_FOUND:ec= GPG_ERR_NOT_FOUND; break;
  80     case SW_REF_NOT_FOUND:  ec = GPG_ERR_NO_OBJ; break;
  81     case SW_BAD_P0_P1:      ec = GPG_ERR_INV_VALUE; break;
  82     case SW_EXACT_LENGTH:   ec = GPG_ERR_INV_VALUE; break;
  83     case SW_INS_NOT_SUP:    ec = GPG_ERR_CARD; break;
  84     case SW_CLA_NOT_SUP:    ec = GPG_ERR_CARD; break;
  85     case SW_SUCCESS:        ec = 0; break;
  86
  87     case SW_HOST_OUT_OF_CORE: ec = GPG_ERR_ENOMEM; break;
  88     case SW_HOST_INV_VALUE:   ec = GPG_ERR_INV_VALUE; break;
  89     case SW_HOST_INCOMPLETE_CARD_RESPONSE: ec = GPG_ERR_CARD; break;
  90     case SW_HOST_NOT_SUPPORTED: ec = GPG_ERR_NOT_SUPPORTED; break;
  91     case SW_HOST_LOCKING_FAILED: ec = GPG_ERR_BUG; break;
  92     case SW_HOST_BUSY:           ec = GPG_ERR_EBUSY; break;
  93     case SW_HOST_NO_CARD:        ec = GPG_ERR_CARD_NOT_PRESENT; break;
  94     case SW_HOST_CARD_INACTIVE:  ec = GPG_ERR_CARD_RESET; break;
  95     case SW_HOST_CARD_IO_ERROR:  ec = GPG_ERR_EIO; break;
  96     case SW_HOST_GENERAL_ERROR:  ec = GPG_ERR_GENERAL; break;
  97     case SW_HOST_NO_READER:      ec = GPG_ERR_ENODEV; break;
  98     case SW_HOST_ABORTED:        ec = GPG_ERR_CANCELED; break;
  99     case SW_HOST_NO_KEYPAD:      ec = GPG_ERR_NOT_SUPPORTED; break;
 100
 101     default:
 102       if ((sw & 0x010000))
 103         ec = GPG_ERR_GENERAL; /* Should not happen. */
 104       else if ((sw & 0xff00) == SW_MORE_DATA)
 105         ec = 0; /* This should actually never been seen here. */
 106       else
 107         ec = GPG_ERR_CARD;
 108     }
 109   return gpg_error (ec);
 110 }
 111
 112 /* Map a status word from the APDU layer to a gpg-error code.  */
 113 gpg_error_t
 114 iso7816_map_sw (int sw)
 115 {
 116   /* All APDU functions should return 0x9000 on success but for
 117      historical reasons of the implementation some return 0 to
 118      indicate success.  We allow for that here. */
 119   return sw? map_sw (sw) : 0;
 120 }
 121
 122
 123 /* This function is specialized version of the SELECT FILE command.
 124    SLOT is the card and reader as created for example by
 125    apdu_open_reader (), AID is a buffer of size AIDLEN holding the
 126    requested application ID.  The function can't be used to enumerate
 127    AIDs and won't return the AID on success.  The return value is 0
 128    for okay or a GPG error code.  Note that ISO error codes are
 129    internally mapped.  Bit 0 of FLAGS should be set if the card does
 130    not understand P2=0xC0. */
 131 gpg_error_t
 132 iso7816_select_application (int slot, const char *aid, size_t aidlen,
 133                             unsigned int flags)
 134 {
 135   int sw;
 136   sw = apdu_send_simple (slot, 0, 0x00, CMD_SELECT_FILE, 4,
 137                          (flags&1)? 0 :0x0c, aidlen, aid);
 138   return map_sw (sw);
 139 }
 140
 141
 142 gpg_error_t
 143 iso7816_select_file (int slot, int tag, int is_dir,
 144                      unsigned char **result, size_t *resultlen)
 145 {
 146   int sw, p0, p1;
 147   unsigned char tagbuf[2];
 148
 149   tagbuf[0] = (tag >> 8) & 0xff;
 150   tagbuf[1] = tag & 0xff;
 151
 152   if (result || resultlen)
 153     {
 154       *result = NULL;
 155       *resultlen = 0;
 156       return gpg_error (GPG_ERR_NOT_IMPLEMENTED);
 157     }
 158   else
 159     {
 160       p0 = (tag == 0x3F00)? 0: is_dir? 1:2;
 161       p1 = 0x0c; /* No FC return. */
 162       sw = apdu_send_simple (slot, 0, 0x00, CMD_SELECT_FILE,
 163                              p0, p1, 2, (char*)tagbuf );
 164       return map_sw (sw);
 165     }
 166
 167   return 0;
 168 }
 169
 170
 171 /* Do a select file command with a direct path. */
 172 gpg_error_t
 173 iso7816_select_path (int slot, const unsigned short *path, size_t pathlen,
 174                      unsigned char **result, size_t *resultlen)
 175 {
 176   int sw, p0, p1;
 177   unsigned char buffer[100];
 178   int buflen;
 179
 180   if (result || resultlen)
 181     {
 182       *result = NULL;
 183       *resultlen = 0;
 184       return gpg_error (GPG_ERR_NOT_IMPLEMENTED);
 185     }
 186
 187   if (pathlen/2 >= sizeof buffer)
 188     return gpg_error (GPG_ERR_TOO_LARGE);
 189
 190   for (buflen = 0; pathlen; pathlen--, path++)
 191     {
 192       buffer[buflen++] = (*path >> 8);
 193       buffer[buflen++] = *path;
 194     }
 195
 196   p0 = 0x08;
 197   p1 = 0x0c; /* No FC return. */
 198   sw = apdu_send_simple (slot, 0, 0x00, CMD_SELECT_FILE,
 199                          p0, p1, buflen, (char*)buffer );
 200   return map_sw (sw);
 201 }
 202
 203
 204 /* This is a private command currently only working for TCOS cards. */
 205 gpg_error_t
 206 iso7816_list_directory (int slot, int list_dirs,
 207                         unsigned char **result, size_t *resultlen)
 208 {
 209   int sw;
 210
 211   if (!result || !resultlen)
 212     return gpg_error (GPG_ERR_INV_VALUE);
 213   *result = NULL;
 214   *resultlen = 0;
 215
 216   sw = apdu_send (slot, 0, 0x80, 0xAA, list_dirs? 1:2, 0, -1, NULL,
 217                   result, resultlen);
 218   if (sw != SW_SUCCESS)
 219     {
 220       /* Make sure that pending buffers are released. */
 221       xfree (*result);
 222       *result = NULL;
 223       *resultlen = 0;
 224     }
 225   return map_sw (sw);
 226 }
 227
 228
 229 /* This funcion sends an already formatted APDU to the card.  With
 230    HANDLE_MORE set to true a MORE DATA status will be handled
 231    internally.  The return value is a gpg error code (i.e. a mapped
 232    status word).  This is basically the same as apdu_send_direct but
 233    it maps the status word and does not return it in the result
 234    buffer.  */
 235 gpg_error_t
 236 iso7816_apdu_direct (int slot, const void *apdudata, size_t apdudatalen,
 237                      int handle_more,
 238                      unsigned char **result, size_t *resultlen)
 239 {
 240   int sw;
 241
 242   if (!result || !resultlen)
 243     return gpg_error (GPG_ERR_INV_VALUE);
 244   *result = NULL;
 245   *resultlen = 0;
 246
 247   sw = apdu_send_direct (slot, 0, apdudata, apdudatalen, handle_more,
 248                          result, resultlen);
 249   if (!sw)
 250     {
 251       if (*resultlen < 2)
 252         sw = SW_HOST_GENERAL_ERROR;
 253       else
 254         {
 255           sw = ((*result)[*resultlen-2] << 8) | (*result)[*resultlen-1];
 256           (*resultlen)--;
 257           (*resultlen)--;
 258         }
 259     }
 260   if (sw != SW_SUCCESS)
 261     {
 262       /* Make sure that pending buffers are released. */
 263       xfree (*result);
 264       *result = NULL;
 265       *resultlen = 0;
 266     }
 267   return map_sw (sw);
 268 }
 269
 270
 271 /* Check whether the reader supports the ISO command code COMMAND on
 272    the keypad.  Returns 0 on success.  */
 273 gpg_error_t
 274 iso7816_check_keypad (int slot, int command, iso7816_pininfo_t *pininfo)
 275 {
 276   int sw;
 277
 278   sw = apdu_check_keypad (slot, command,
 279                           pininfo->mode, pininfo->minlen, pininfo->maxlen,
 280                           pininfo->padlen);
 281   return iso7816_map_sw (sw);
 282 }
 283
 284
 285 /* Perform a VERIFY command on SLOT using the card holder verification
 286    vector CHVNO with a CHV of lenght CHVLEN.  With PININFO non-NULL
 287    the keypad of the reader will be used.  Returns 0 on success. */
 288 gpg_error_t
 289 iso7816_verify_kp (int slot, int chvno, const char *chv, size_t chvlen,
 290                    iso7816_pininfo_t *pininfo)
 291 {
 292   int sw;
 293
 294   if (pininfo && pininfo->mode)
 295     sw = apdu_send_simple_kp (slot, 0x00, CMD_VERIFY, 0, chvno, chvlen, chv,
 296                               pininfo->mode,
 297                               pininfo->minlen,
 298                               pininfo->maxlen,
 299                               pininfo->padlen);
 300   else
 301     sw = apdu_send_simple (slot, 0, 0x00, CMD_VERIFY, 0, chvno, chvlen, chv);
 302   return map_sw (sw);
 303 }
 304
 305 /* Perform a VERIFY command on SLOT using the card holder verification
 306    vector CHVNO with a CHV of lenght CHVLEN.  Returns 0 on success. */
 307 gpg_error_t
 308 iso7816_verify (int slot, int chvno, const char *chv, size_t chvlen)
 309 {
 310   return iso7816_verify_kp (slot, chvno, chv, chvlen, NULL);
 311 }
 312
 313 /* Perform a CHANGE_REFERENCE_DATA command on SLOT for the card holder
 314    verification vector CHVNO.  If the OLDCHV is NULL (and OLDCHVLEN
 315    0), a "change reference data" is done, otherwise an "exchange
 316    reference data".  The new reference data is expected in NEWCHV of
 317    length NEWCHVLEN.  With PININFO non-NULL the keypad of the reader
 318    will be used.  */
 319 gpg_error_t
 320 iso7816_change_reference_data_kp (int slot, int chvno,
 321                                   const char *oldchv, size_t oldchvlen,
 322                                   const char *newchv, size_t newchvlen,
 323                                   iso7816_pininfo_t *pininfo)
 324 {
 325   int sw;
 326   char *buf;
 327
 328   if ((!oldchv && oldchvlen)
 329       || (oldchv && !oldchvlen)
 330       || !newchv || !newchvlen )
 331     return gpg_error (GPG_ERR_INV_VALUE);
 332
 333   buf = xtrymalloc (oldchvlen + newchvlen);
 334   if (!buf)
 335     return gpg_error (gpg_err_code_from_errno (errno));
 336   if (oldchvlen)
 337     memcpy (buf, oldchv, oldchvlen);
 338   memcpy (buf+oldchvlen, newchv, newchvlen);
 339
 340   if (pininfo && pininfo->mode)
 341     sw = apdu_send_simple_kp (slot, 0x00, CMD_CHANGE_REFERENCE_DATA,
 342                            oldchvlen? 0 : 1, chvno, oldchvlen+newchvlen, buf,
 343                            pininfo->mode,
 344                            pininfo->minlen,
 345                            pininfo->maxlen,
 346                            pininfo->padlen);
 347   else
 348     sw = apdu_send_simple (slot, 0, 0x00, CMD_CHANGE_REFERENCE_DATA,
 349                            oldchvlen? 0 : 1, chvno, oldchvlen+newchvlen, buf);
 350   xfree (buf);
 351   return map_sw (sw);
 352
 353 }
 354
 355 /* Perform a CHANGE_REFERENCE_DATA command on SLOT for the card holder
 356    verification vector CHVNO.  If the OLDCHV is NULL (and OLDCHVLEN
 357    0), a "change reference data" is done, otherwise an "exchange
 358    reference data".  The new reference data is expected in NEWCHV of
 359    length NEWCHVLEN.  */
 360 gpg_error_t
 361 iso7816_change_reference_data (int slot, int chvno,
 362                                const char *oldchv, size_t oldchvlen,
 363                                const char *newchv, size_t newchvlen)
 364 {
 365   return iso7816_change_reference_data_kp (slot, chvno, oldchv, oldchvlen,
 366                                            newchv, newchvlen, NULL);
 367 }
 368
 369
 370 gpg_error_t
 371 iso7816_reset_retry_counter_kp (int slot, int chvno,
 372                                 const char *newchv, size_t newchvlen,
 373                                 iso7816_pininfo_t *pininfo)
 374 {
 375   int sw;
 376
 377   if (!newchv || !newchvlen )
 378     return gpg_error (GPG_ERR_INV_VALUE);
 379
 380   /* FIXME:  The keypad mode has not yet been tested.  */
 381   if (pininfo && pininfo->mode)
 382     sw = apdu_send_simple_kp (slot, 0x00, CMD_RESET_RETRY_COUNTER,
 383                            2, chvno, newchvlen, newchv,
 384                            pininfo->mode,
 385                            pininfo->minlen,
 386                            pininfo->maxlen,
 387                            pininfo->padlen);
 388   else
 389     sw = apdu_send_simple (slot, 0, 0x00, CMD_RESET_RETRY_COUNTER,
 390                            2, chvno, newchvlen, newchv);
 391   return map_sw (sw);
 392 }
 393
 394
 395 gpg_error_t
 396 iso7816_reset_retry_counter_with_rc (int slot, int chvno,
 397                                      const char *data, size_t datalen)
 398 {
 399   int sw;
 400
 401   if (!data || !datalen )
 402     return gpg_error (GPG_ERR_INV_VALUE);
 403
 404   sw = apdu_send_simple (slot, 0, 0x00, CMD_RESET_RETRY_COUNTER,
 405                          0, chvno, datalen, data);
 406   return map_sw (sw);
 407 }
 408
 409
 410 gpg_error_t
 411 iso7816_reset_retry_counter (int slot, int chvno,
 412                              const char *newchv, size_t newchvlen)
 413 {
 414   return iso7816_reset_retry_counter_kp (slot, chvno, newchv, newchvlen, NULL);
 415 }
 416
 417
 418
 419 /* Perform a GET DATA command requesting TAG and storing the result in
 420    a newly allocated buffer at the address passed by RESULT.  Return
 421    the length of this data at the address of RESULTLEN. */
 422 gpg_error_t
 423 iso7816_get_data (int slot, int extended_mode, int tag,
 424                   unsigned char **result, size_t *resultlen)
 425 {
 426   int sw;
 427   int le;
 428
 429   if (!result || !resultlen)
 430     return gpg_error (GPG_ERR_INV_VALUE);
 431   *result = NULL;
 432   *resultlen = 0;
 433
 434   if (extended_mode > 0 && extended_mode < 256)
 435     le = 65534; /* Not 65535 in case it is used as some special flag.  */
 436   else if (extended_mode > 0)
 437     le = extended_mode;
 438   else
 439     le = 256;
 440
 441   sw = apdu_send_le (slot, extended_mode, 0x00, CMD_GET_DATA,
 442                      ((tag >> 8) & 0xff), (tag & 0xff), -1, NULL, le,
 443                      result, resultlen);
 444   if (sw != SW_SUCCESS)
 445     {
 446       /* Make sure that pending buffers are released. */
 447       xfree (*result);
 448       *result = NULL;
 449       *resultlen = 0;
 450       return map_sw (sw);
 451     }
 452
 453   return 0;
 454 }
 455
 456
 457 /* Perform a PUT DATA command on card in SLOT.  Write DATA of length
 458    DATALEN to TAG.  EXTENDED_MODE controls whether extended length
 459    headers or command chaining is used instead of single length
 460    bytes. */
 461 gpg_error_t
 462 iso7816_put_data (int slot, int extended_mode, int tag,
 463                   const unsigned char *data, size_t datalen)
 464 {
 465   int sw;
 466
 467   sw = apdu_send_simple (slot, extended_mode, 0x00, CMD_PUT_DATA,
 468                          ((tag >> 8) & 0xff), (tag & 0xff),
 469                          datalen, (const char*)data);
 470   return map_sw (sw);
 471 }
 472
 473 /* Same as iso7816_put_data but uses an odd instruction byte.  */
 474 gpg_error_t
 475 iso7816_put_data_odd (int slot, int extended_mode, int tag,
 476                       const unsigned char *data, size_t datalen)
 477 {
 478   int sw;
 479
 480   sw = apdu_send_simple (slot, extended_mode, 0x00, CMD_PUT_DATA+1,
 481                          ((tag >> 8) & 0xff), (tag & 0xff),
 482                          datalen, (const char*)data);
 483   return map_sw (sw);
 484 }
 485
 486 /* Manage Security Environment.  This is a weird operation and there
 487    is no easy abstraction for it.  Furthermore, some card seem to have
 488    a different interpreation of 7816-8 and thus we resort to let the
 489    caller decide what to do. */
 490 gpg_error_t
 491 iso7816_manage_security_env (int slot, int p1, int p2,
 492                              const unsigned char *data, size_t datalen)
 493 {
 494   int sw;
 495
 496   if (p1 < 0 || p1 > 255 || p2 < 0 || p2 > 255 )
 497     return gpg_error (GPG_ERR_INV_VALUE);
 498
 499   sw = apdu_send_simple (slot, 0, 0x00, CMD_MSE, p1, p2,
 500                          data? datalen : -1, (const char*)data);
 501   return map_sw (sw);
 502 }
 503
 504
 505 /* Perform the security operation COMPUTE DIGITAL SIGANTURE.  On
 506    success 0 is returned and the data is availavle in a newly
 507    allocated buffer stored at RESULT with its length stored at
 508    RESULTLEN.  For LE see do_generate_keypair. */
 509 gpg_error_t
 510 iso7816_compute_ds (int slot, int extended_mode,
 511                     const unsigned char *data, size_t datalen, int le,
 512                     unsigned char **result, size_t *resultlen)
 513 {
 514   int sw;
 515
 516   if (!data || !datalen || !result || !resultlen)
 517     return gpg_error (GPG_ERR_INV_VALUE);
 518   *result = NULL;
 519   *resultlen = 0;
 520
 521   if (!extended_mode)
 522     le = 256;  /* Ignore provided Le and use what apdu_send uses. */
 523   else if (le >= 0 && le < 256)
 524     le = 256;
 525
 526   sw = apdu_send_le (slot, extended_mode,
 527                      0x00, CMD_PSO, 0x9E, 0x9A,
 528                      datalen, (const char*)data,
 529                      le,
 530                      result, resultlen);
 531   if (sw != SW_SUCCESS)
 532     {
 533       /* Make sure that pending buffers are released. */
 534       xfree (*result);
 535       *result = NULL;
 536       *resultlen = 0;
 537       return map_sw (sw);
 538     }
 539
 540   return 0;
 541 }
 542
 543
 544 /* Perform the security operation DECIPHER.  PADIND is the padding
 545    indicator to be used.  It should be 0 if no padding is required, a
 546    value of -1 suppresses the padding byte.  On success 0 is returned
 547    and the plaintext is available in a newly allocated buffer stored
 548    at RESULT with its length stored at RESULTLEN. */
 549 gpg_error_t
 550 iso7816_decipher (int slot, int extended_mode,
 551                   const unsigned char *data, size_t datalen,
 552                   int padind, unsigned char **result, size_t *resultlen)
 553 {
 554   int sw;
 555   unsigned char *buf;
 556
 557   if (!data || !datalen || !result || !resultlen)
 558     return gpg_error (GPG_ERR_INV_VALUE);
 559   *result = NULL;
 560   *resultlen = 0;
 561
 562   if (padind >= 0)
 563     {
 564       /* We need to prepend the padding indicator. */
 565       buf = xtrymalloc (datalen + 1);
 566       if (!buf)
 567         return gpg_error (gpg_err_code_from_errno (errno));
 568
 569       *buf = padind; /* Padding indicator. */
 570       memcpy (buf+1, data, datalen);
 571       sw = apdu_send (slot, extended_mode,
 572                       0x00, CMD_PSO, 0x80, 0x86,
 573                       datalen+1, (char*)buf,
 574                       result, resultlen);
 575       xfree (buf);
 576     }
 577   else
 578     {
 579       sw = apdu_send (slot, extended_mode,
 580                       0x00, CMD_PSO, 0x80, 0x86,
 581                       datalen, (const char *)data,
 582                       result, resultlen);
 583     }
 584   if (sw != SW_SUCCESS)
 585     {
 586       /* Make sure that pending buffers are released. */
 587       xfree (*result);
 588       *result = NULL;
 589       *resultlen = 0;
 590       return map_sw (sw);
 591     }
 592
 593   return 0;
 594 }
 595
 596
 597 /*  For LE see do_generate_keypair.  */
 598 gpg_error_t
 599 iso7816_internal_authenticate (int slot, int extended_mode,
 600                                const unsigned char *data, size_t datalen,
 601                                int le,
 602                                unsigned char **result, size_t *resultlen)
 603 {
 604   int sw;
 605
 606   if (!data || !datalen || !result || !resultlen)
 607     return gpg_error (GPG_ERR_INV_VALUE);
 608   *result = NULL;
 609   *resultlen = 0;
 610
 611   if (!extended_mode)
 612     le = 256;  /* Ignore provided Le and use what apdu_send uses. */
 613   else if (le >= 0 && le < 256)
 614     le = 256;
 615
 616   sw = apdu_send_le (slot, extended_mode,
 617                      0x00, CMD_INTERNAL_AUTHENTICATE, 0, 0,
 618                      datalen, (const char*)data,
 619                      le,
 620                      result, resultlen);
 621   if (sw != SW_SUCCESS)
 622     {
 623       /* Make sure that pending buffers are released. */
 624       xfree (*result);
 625       *result = NULL;
 626       *resultlen = 0;
 627       return map_sw (sw);
 628     }
 629
 630   return 0;
 631 }
 632
 633
 634 /* LE is the expected return length.  This is usually 0 except if
 635    extended length mode is used and more than 256 byte will be
 636    returned.  In that case a value of -1 uses a large default
 637    (e.g. 4096 bytes), a value larger 256 used that value.  */
 638 static gpg_error_t
 639 do_generate_keypair (int slot, int extended_mode, int readonly,
 640                      const unsigned char *data, size_t datalen,
 641                      int le,
 642                      unsigned char **result, size_t *resultlen)
 643 {
 644   int sw;
 645
 646   if (!data || !datalen || !result || !resultlen)
 647     return gpg_error (GPG_ERR_INV_VALUE);
 648   *result = NULL;
 649   *resultlen = 0;
 650
 651   sw = apdu_send_le (slot, extended_mode,
 652                      0x00, CMD_GENERATE_KEYPAIR, readonly? 0x81:0x80, 0,
 653                      datalen, (const char*)data,
 654                      le >= 0 && le < 256? 256:le,
 655                      result, resultlen);
 656   if (sw != SW_SUCCESS)
 657     {
 658       /* Make sure that pending buffers are released. */
 659       xfree (*result);
 660       *result = NULL;
 661       *resultlen = 0;
 662       return map_sw (sw);
 663     }
 664
 665   return 0;
 666 }
 667
 668
 669 gpg_error_t
 670 iso7816_generate_keypair (int slot, int extended_mode,
 671                           const unsigned char *data, size_t datalen,
 672                           int le,
 673                           unsigned char **result, size_t *resultlen)
 674 {
 675   return do_generate_keypair (slot, extended_mode, 0,
 676                               data, datalen, le, result, resultlen);
 677 }
 678
 679
 680 gpg_error_t
 681 iso7816_read_public_key (int slot, int extended_mode,
 682                          const unsigned char *data, size_t datalen,
 683                          int le,
 684                          unsigned char **result, size_t *resultlen)
 685 {
 686   return do_generate_keypair (slot, extended_mode, 1,
 687                               data, datalen, le, result, resultlen);
 688 }
 689
 690
 691
 692 gpg_error_t
 693 iso7816_get_challenge (int slot, int length, unsigned char *buffer)
 694 {
 695   int sw;
 696   unsigned char *result;
 697   size_t resultlen, n;
 698
 699   if (!buffer || length < 1)
 700     return gpg_error (GPG_ERR_INV_VALUE);
 701
 702   do
 703     {
 704       result = NULL;
 705       n = length > 254? 254 : length;
 706       sw = apdu_send_le (slot, 0,
 707                          0x00, CMD_GET_CHALLENGE, 0, 0, -1, NULL, n,
 708                          &result, &resultlen);
 709       if (sw != SW_SUCCESS)
 710         {
 711           /* Make sure that pending buffers are released. */
 712           xfree (result);
 713           return map_sw (sw);
 714         }
 715       if (resultlen > n)
 716         resultlen = n;
 717       memcpy (buffer, result, resultlen);
 718       buffer += resultlen;
 719       length -= resultlen;
 720       xfree (result);
 721     }
 722   while (length > 0);
 723
 724   return 0;
 725 }
 726
 727 /* Perform a READ BINARY command requesting a maximum of NMAX bytes
 728    from OFFSET.  With NMAX = 0 the entire file is read. The result is
 729    stored in a newly allocated buffer at the address passed by RESULT.
 730    Returns the length of this data at the address of RESULTLEN. */
 731 gpg_error_t
 732 iso7816_read_binary (int slot, size_t offset, size_t nmax,
 733                      unsigned char **result, size_t *resultlen)
 734 {
 735   int sw;
 736   unsigned char *buffer;
 737   size_t bufferlen;
 738   int read_all = !nmax;
 739   size_t n;
 740
 741   if (!result || !resultlen)
 742     return gpg_error (GPG_ERR_INV_VALUE);
 743   *result = NULL;
 744   *resultlen = 0;
 745
 746   /* We can only encode 15 bits in p0,p1 to indicate an offset. Thus
 747      we check for this limit. */
 748   if (offset > 32767)
 749     return gpg_error (GPG_ERR_INV_VALUE);
 750
 751   do
 752     {
 753       buffer = NULL;
 754       bufferlen = 0;
 755       n = read_all? 0 : nmax;
 756       sw = apdu_send_le (slot, 0, 0x00, CMD_READ_BINARY,
 757                          ((offset>>8) & 0xff), (offset & 0xff) , -1, NULL,
 758                          n, &buffer, &bufferlen);
 759       if ( SW_EXACT_LENGTH_P(sw) )
 760         {
 761           n = (sw & 0x00ff);
 762           sw = apdu_send_le (slot, 0, 0x00, CMD_READ_BINARY,
 763                              ((offset>>8) & 0xff), (offset & 0xff) , -1, NULL,
 764                              n, &buffer, &bufferlen);
 765         }
 766
 767       if (*result && sw == SW_BAD_P0_P1)
 768         {
 769           /* Bad Parameter means that the offset is outside of the
 770              EF. When reading all data we take this as an indication
 771              for EOF.  */
 772           break;
 773         }
 774
 775       if (sw != SW_SUCCESS && sw != SW_EOF_REACHED)
 776         {
 777           /* Make sure that pending buffers are released. */
 778           xfree (buffer);
 779           xfree (*result);
 780           *result = NULL;
 781           *resultlen = 0;
 782           return map_sw (sw);
 783         }
 784       if (*result) /* Need to extend the buffer. */
 785         {
 786           unsigned char *p = xtryrealloc (*result, *resultlen + bufferlen);
 787           if (!p)
 788             {
 789               gpg_error_t err = gpg_error_from_syserror ();
 790               xfree (buffer);
 791               xfree (*result);
 792               *result = NULL;
 793               *resultlen = 0;
 794               return err;
 795             }
 796           *result = p;
 797           memcpy (*result + *resultlen, buffer, bufferlen);
 798           *resultlen += bufferlen;
 799           xfree (buffer);
 800           buffer = NULL;
 801         }
 802       else /* Transfer the buffer into our result. */
 803         {
 804           *result = buffer;
 805           *resultlen = bufferlen;
 806         }
 807       offset += bufferlen;
 808       if (offset > 32767)
 809         break; /* We simply truncate the result for too large
 810                   files. */
 811       if (nmax > bufferlen)
 812         nmax -= bufferlen;
 813       else
 814         nmax = 0;
 815     }
 816   while ((read_all && sw != SW_EOF_REACHED) || (!read_all && nmax));
 817
 818   return 0;
 819 }
 820
 821 /* Perform a READ RECORD command. RECNO gives the record number to
 822    read with 0 indicating the current record.  RECCOUNT must be 1 (not
 823    all cards support reading of more than one record).  SHORT_EF
 824    should be 0 to read the current EF or contain a short EF. The
 825    result is stored in a newly allocated buffer at the address passed
 826    by RESULT.  Returns the length of this data at the address of
 827    RESULTLEN. */
 828 gpg_error_t
 829 iso7816_read_record (int slot, int recno, int reccount, int short_ef,
 830                      unsigned char **result, size_t *resultlen)
 831 {
 832   int sw;
 833   unsigned char *buffer;
 834   size_t bufferlen;
 835
 836   if (!result || !resultlen)
 837     return gpg_error (GPG_ERR_INV_VALUE);
 838   *result = NULL;
 839   *resultlen = 0;
 840
 841   /* We can only encode 15 bits in p0,p1 to indicate an offset. Thus
 842      we check for this limit. */
 843   if (recno < 0 || recno > 255 || reccount != 1
 844       || short_ef < 0 || short_ef > 254 )
 845     return gpg_error (GPG_ERR_INV_VALUE);
 846
 847   buffer = NULL;
 848   bufferlen = 0;
 849   sw = apdu_send_le (slot, 0, 0x00, CMD_READ_RECORD,
 850                      recno,
 851                      short_ef? short_ef : 0x04,
 852                      -1, NULL,
 853                      0, &buffer, &bufferlen);
 854
 855   if (sw != SW_SUCCESS && sw != SW_EOF_REACHED)
 856     {
 857       /* Make sure that pending buffers are released. */
 858       xfree (buffer);
 859       xfree (*result);
 860       *result = NULL;
 861       *resultlen = 0;
 862       return map_sw (sw);
 863     }
 864   *result = buffer;
 865   *resultlen = bufferlen;
 866
 867   return 0;
 868 }
 869