Line data Source code
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 :
20 : #include <config.h>
21 : #include <errno.h>
22 : #include <stdio.h>
23 : #include <stdlib.h>
24 : #include <string.h>
25 :
26 : #if defined(GNUPG_SCD_MAIN_HEADER)
27 : #include GNUPG_SCD_MAIN_HEADER
28 : #elif GNUPG_MAJOR_VERSION == 1
29 : /* This is used with GnuPG version < 1.9. The code has been source
30 : copied from the current GnuPG >= 1.9 and is maintained over
31 : there. */
32 : #include "options.h"
33 : #include "errors.h"
34 : #include "memory.h"
35 : #include "util.h"
36 : #include "i18n.h"
37 : #else /* GNUPG_MAJOR_VERSION != 1 */
38 : #include "scdaemon.h"
39 : #endif /* GNUPG_MAJOR_VERSION != 1 */
40 :
41 : #include "iso7816.h"
42 : #include "apdu.h"
43 :
44 :
45 : #define CMD_SELECT_FILE 0xA4
46 : #define CMD_VERIFY ISO7816_VERIFY
47 : #define CMD_CHANGE_REFERENCE_DATA ISO7816_CHANGE_REFERENCE_DATA
48 : #define CMD_RESET_RETRY_COUNTER ISO7816_RESET_RETRY_COUNTER
49 : #define CMD_GET_DATA 0xCA
50 : #define CMD_PUT_DATA 0xDA
51 : #define CMD_MSE 0x22
52 : #define CMD_PSO 0x2A
53 : #define CMD_INTERNAL_AUTHENTICATE 0x88
54 : #define CMD_GENERATE_KEYPAIR 0x47
55 : #define CMD_GET_CHALLENGE 0x84
56 : #define CMD_READ_BINARY 0xB0
57 : #define CMD_READ_RECORD 0xB2
58 :
59 : static gpg_error_t
60 0 : map_sw (int sw)
61 : {
62 : gpg_err_code_t ec;
63 :
64 0 : switch (sw)
65 : {
66 0 : case SW_EEPROM_FAILURE: ec = GPG_ERR_HARDWARE; break;
67 0 : case SW_TERM_STATE: ec = GPG_ERR_OBJ_TERM_STATE; break;
68 0 : case SW_WRONG_LENGTH: ec = GPG_ERR_INV_VALUE; break;
69 0 : case SW_SM_NOT_SUP: ec = GPG_ERR_NOT_SUPPORTED; break;
70 0 : case SW_CC_NOT_SUP: ec = GPG_ERR_NOT_SUPPORTED; break;
71 0 : case SW_CHV_WRONG: ec = GPG_ERR_BAD_PIN; break;
72 0 : case SW_CHV_BLOCKED: ec = GPG_ERR_PIN_BLOCKED; break;
73 0 : case SW_USE_CONDITIONS: ec = GPG_ERR_USE_CONDITIONS; break;
74 0 : case SW_NOT_SUPPORTED: ec = GPG_ERR_NOT_SUPPORTED; break;
75 0 : case SW_BAD_PARAMETER: ec = GPG_ERR_INV_VALUE; break;
76 0 : case SW_FILE_NOT_FOUND: ec = GPG_ERR_ENOENT; break;
77 0 : case SW_RECORD_NOT_FOUND:ec= GPG_ERR_NOT_FOUND; break;
78 0 : case SW_REF_NOT_FOUND: ec = GPG_ERR_NO_OBJ; break;
79 0 : case SW_BAD_P0_P1: ec = GPG_ERR_INV_VALUE; break;
80 0 : case SW_EXACT_LENGTH: ec = GPG_ERR_INV_VALUE; break;
81 0 : case SW_INS_NOT_SUP: ec = GPG_ERR_CARD; break;
82 0 : case SW_CLA_NOT_SUP: ec = GPG_ERR_CARD; break;
83 0 : case SW_SUCCESS: ec = 0; break;
84 :
85 0 : case SW_HOST_OUT_OF_CORE: ec = GPG_ERR_ENOMEM; break;
86 0 : case SW_HOST_INV_VALUE: ec = GPG_ERR_INV_VALUE; break;
87 0 : case SW_HOST_INCOMPLETE_CARD_RESPONSE: ec = GPG_ERR_CARD; break;
88 0 : case SW_HOST_NOT_SUPPORTED: ec = GPG_ERR_NOT_SUPPORTED; break;
89 0 : case SW_HOST_LOCKING_FAILED: ec = GPG_ERR_BUG; break;
90 0 : case SW_HOST_BUSY: ec = GPG_ERR_EBUSY; break;
91 0 : case SW_HOST_NO_CARD: ec = GPG_ERR_CARD_NOT_PRESENT; break;
92 0 : case SW_HOST_CARD_INACTIVE: ec = GPG_ERR_CARD_RESET; break;
93 0 : case SW_HOST_CARD_IO_ERROR: ec = GPG_ERR_EIO; break;
94 0 : case SW_HOST_GENERAL_ERROR: ec = GPG_ERR_GENERAL; break;
95 0 : case SW_HOST_NO_READER: ec = GPG_ERR_ENODEV; break;
96 0 : case SW_HOST_ABORTED: ec = GPG_ERR_CANCELED; break;
97 0 : case SW_HOST_NO_PINPAD: ec = GPG_ERR_NOT_SUPPORTED; break;
98 :
99 : default:
100 0 : if ((sw & 0x010000))
101 0 : ec = GPG_ERR_GENERAL; /* Should not happen. */
102 0 : else if ((sw & 0xff00) == SW_MORE_DATA)
103 0 : ec = 0; /* This should actually never been seen here. */
104 : else
105 0 : ec = GPG_ERR_CARD;
106 : }
107 0 : return gpg_error (ec);
108 : }
109 :
110 : /* Map a status word from the APDU layer to a gpg-error code. */
111 : gpg_error_t
112 0 : iso7816_map_sw (int sw)
113 : {
114 : /* All APDU functions should return 0x9000 on success but for
115 : historical reasons of the implementation some return 0 to
116 : indicate success. We allow for that here. */
117 0 : return sw? map_sw (sw) : 0;
118 : }
119 :
120 :
121 : /* This function is specialized version of the SELECT FILE command.
122 : SLOT is the card and reader as created for example by
123 : apdu_open_reader (), AID is a buffer of size AIDLEN holding the
124 : requested application ID. The function can't be used to enumerate
125 : AIDs and won't return the AID on success. The return value is 0
126 : for okay or a GPG error code. Note that ISO error codes are
127 : internally mapped. Bit 0 of FLAGS should be set if the card does
128 : not understand P2=0xC0. */
129 : gpg_error_t
130 0 : iso7816_select_application (int slot, const char *aid, size_t aidlen,
131 : unsigned int flags)
132 : {
133 : int sw;
134 0 : sw = apdu_send_simple (slot, 0, 0x00, CMD_SELECT_FILE, 4,
135 0 : (flags&1)? 0 :0x0c, aidlen, aid);
136 0 : return map_sw (sw);
137 : }
138 :
139 :
140 : gpg_error_t
141 0 : iso7816_select_file (int slot, int tag, int is_dir,
142 : unsigned char **result, size_t *resultlen)
143 : {
144 : int sw, p0, p1;
145 : unsigned char tagbuf[2];
146 :
147 0 : tagbuf[0] = (tag >> 8) & 0xff;
148 0 : tagbuf[1] = tag & 0xff;
149 :
150 0 : if (result || resultlen)
151 : {
152 0 : *result = NULL;
153 0 : *resultlen = 0;
154 0 : return gpg_error (GPG_ERR_NOT_IMPLEMENTED);
155 : }
156 : else
157 : {
158 0 : p0 = (tag == 0x3F00)? 0: is_dir? 1:2;
159 0 : p1 = 0x0c; /* No FC return. */
160 0 : sw = apdu_send_simple (slot, 0, 0x00, CMD_SELECT_FILE,
161 : p0, p1, 2, (char*)tagbuf );
162 0 : return map_sw (sw);
163 : }
164 :
165 : return 0;
166 : }
167 :
168 :
169 : /* Do a select file command with a direct path. */
170 : gpg_error_t
171 0 : iso7816_select_path (int slot, const unsigned short *path, size_t pathlen,
172 : unsigned char **result, size_t *resultlen)
173 : {
174 : int sw, p0, p1;
175 : unsigned char buffer[100];
176 : int buflen;
177 :
178 0 : if (result || resultlen)
179 : {
180 0 : *result = NULL;
181 0 : *resultlen = 0;
182 0 : return gpg_error (GPG_ERR_NOT_IMPLEMENTED);
183 : }
184 :
185 0 : if (pathlen/2 >= sizeof buffer)
186 0 : return gpg_error (GPG_ERR_TOO_LARGE);
187 :
188 0 : for (buflen = 0; pathlen; pathlen--, path++)
189 : {
190 0 : buffer[buflen++] = (*path >> 8);
191 0 : buffer[buflen++] = *path;
192 : }
193 :
194 0 : p0 = 0x08;
195 0 : p1 = 0x0c; /* No FC return. */
196 0 : sw = apdu_send_simple (slot, 0, 0x00, CMD_SELECT_FILE,
197 : p0, p1, buflen, (char*)buffer );
198 0 : return map_sw (sw);
199 : }
200 :
201 :
202 : /* This is a private command currently only working for TCOS cards. */
203 : gpg_error_t
204 0 : iso7816_list_directory (int slot, int list_dirs,
205 : unsigned char **result, size_t *resultlen)
206 : {
207 : int sw;
208 :
209 0 : if (!result || !resultlen)
210 0 : return gpg_error (GPG_ERR_INV_VALUE);
211 0 : *result = NULL;
212 0 : *resultlen = 0;
213 :
214 0 : sw = apdu_send (slot, 0, 0x80, 0xAA, list_dirs? 1:2, 0, -1, NULL,
215 : result, resultlen);
216 0 : if (sw != SW_SUCCESS)
217 : {
218 : /* Make sure that pending buffers are released. */
219 0 : xfree (*result);
220 0 : *result = NULL;
221 0 : *resultlen = 0;
222 : }
223 0 : return map_sw (sw);
224 : }
225 :
226 :
227 : /* This funcion sends an already formatted APDU to the card. With
228 : HANDLE_MORE set to true a MORE DATA status will be handled
229 : internally. The return value is a gpg error code (i.e. a mapped
230 : status word). This is basically the same as apdu_send_direct but
231 : it maps the status word and does not return it in the result
232 : buffer. */
233 : gpg_error_t
234 0 : iso7816_apdu_direct (int slot, const void *apdudata, size_t apdudatalen,
235 : int handle_more,
236 : unsigned char **result, size_t *resultlen)
237 : {
238 : int sw;
239 :
240 0 : if (!result || !resultlen)
241 0 : return gpg_error (GPG_ERR_INV_VALUE);
242 0 : *result = NULL;
243 0 : *resultlen = 0;
244 :
245 0 : sw = apdu_send_direct (slot, 0, apdudata, apdudatalen, handle_more,
246 : result, resultlen);
247 0 : if (!sw)
248 : {
249 0 : if (*resultlen < 2)
250 0 : sw = SW_HOST_GENERAL_ERROR;
251 : else
252 : {
253 0 : sw = ((*result)[*resultlen-2] << 8) | (*result)[*resultlen-1];
254 0 : (*resultlen)--;
255 0 : (*resultlen)--;
256 : }
257 : }
258 0 : if (sw != SW_SUCCESS)
259 : {
260 : /* Make sure that pending buffers are released. */
261 0 : xfree (*result);
262 0 : *result = NULL;
263 0 : *resultlen = 0;
264 : }
265 0 : return map_sw (sw);
266 : }
267 :
268 :
269 : /* Check whether the reader supports the ISO command code COMMAND on
270 : the pinpad. Returns 0 on success. */
271 : gpg_error_t
272 0 : iso7816_check_pinpad (int slot, int command, pininfo_t *pininfo)
273 : {
274 : int sw;
275 :
276 0 : sw = apdu_check_pinpad (slot, command, pininfo);
277 0 : return iso7816_map_sw (sw);
278 : }
279 :
280 :
281 : /* Perform a VERIFY command on SLOT using the card holder verification
282 : vector CHVNO. With PININFO non-NULL the pinpad of the reader will
283 : be used. Returns 0 on success. */
284 : gpg_error_t
285 0 : iso7816_verify_kp (int slot, int chvno, pininfo_t *pininfo)
286 : {
287 : int sw;
288 :
289 0 : sw = apdu_pinpad_verify (slot, 0x00, CMD_VERIFY, 0, chvno, pininfo);
290 0 : return map_sw (sw);
291 : }
292 :
293 : /* Perform a VERIFY command on SLOT using the card holder verification
294 : vector CHVNO with a CHV of lenght CHVLEN. Returns 0 on success. */
295 : gpg_error_t
296 0 : iso7816_verify (int slot, int chvno, const char *chv, size_t chvlen)
297 : {
298 : int sw;
299 :
300 0 : sw = apdu_send_simple (slot, 0, 0x00, CMD_VERIFY, 0, chvno, chvlen, chv);
301 0 : return map_sw (sw);
302 : }
303 :
304 : /* Perform a CHANGE_REFERENCE_DATA command on SLOT for the card holder
305 : verification vector CHVNO. With PININFO non-NULL the pinpad of the
306 : reader will be used. If IS_EXCHANGE is 0, a "change reference
307 : data" is done, otherwise an "exchange reference data". */
308 : gpg_error_t
309 0 : iso7816_change_reference_data_kp (int slot, int chvno, int is_exchange,
310 : pininfo_t *pininfo)
311 : {
312 : int sw;
313 :
314 0 : sw = apdu_pinpad_modify (slot, 0x00, CMD_CHANGE_REFERENCE_DATA,
315 : is_exchange ? 1 : 0, chvno, pininfo);
316 0 : return map_sw (sw);
317 : }
318 :
319 : /* Perform a CHANGE_REFERENCE_DATA command on SLOT for the card holder
320 : verification vector CHVNO. If the OLDCHV is NULL (and OLDCHVLEN
321 : 0), a "change reference data" is done, otherwise an "exchange
322 : reference data". The new reference data is expected in NEWCHV of
323 : length NEWCHVLEN. */
324 : gpg_error_t
325 0 : iso7816_change_reference_data (int slot, int chvno,
326 : const char *oldchv, size_t oldchvlen,
327 : const char *newchv, size_t newchvlen)
328 : {
329 : int sw;
330 : char *buf;
331 :
332 0 : if ((!oldchv && oldchvlen)
333 0 : || (oldchv && !oldchvlen)
334 0 : || !newchv || !newchvlen )
335 0 : return gpg_error (GPG_ERR_INV_VALUE);
336 :
337 0 : buf = xtrymalloc (oldchvlen + newchvlen);
338 0 : if (!buf)
339 0 : return gpg_error (gpg_err_code_from_errno (errno));
340 0 : if (oldchvlen)
341 0 : memcpy (buf, oldchv, oldchvlen);
342 0 : memcpy (buf+oldchvlen, newchv, newchvlen);
343 :
344 0 : sw = apdu_send_simple (slot, 0, 0x00, CMD_CHANGE_REFERENCE_DATA,
345 : oldchvlen? 0 : 1, chvno, oldchvlen+newchvlen, buf);
346 0 : xfree (buf);
347 0 : return map_sw (sw);
348 :
349 : }
350 :
351 :
352 : gpg_error_t
353 0 : iso7816_reset_retry_counter_with_rc (int slot, int chvno,
354 : const char *data, size_t datalen)
355 : {
356 : int sw;
357 :
358 0 : if (!data || !datalen )
359 0 : return gpg_error (GPG_ERR_INV_VALUE);
360 :
361 0 : sw = apdu_send_simple (slot, 0, 0x00, CMD_RESET_RETRY_COUNTER,
362 : 0, chvno, datalen, data);
363 0 : return map_sw (sw);
364 : }
365 :
366 :
367 : gpg_error_t
368 0 : iso7816_reset_retry_counter (int slot, int chvno,
369 : const char *newchv, size_t newchvlen)
370 : {
371 : int sw;
372 :
373 0 : sw = apdu_send_simple (slot, 0, 0x00, CMD_RESET_RETRY_COUNTER,
374 : 2, chvno, newchvlen, newchv);
375 0 : return map_sw (sw);
376 : }
377 :
378 :
379 :
380 : /* Perform a GET DATA command requesting TAG and storing the result in
381 : a newly allocated buffer at the address passed by RESULT. Return
382 : the length of this data at the address of RESULTLEN. */
383 : gpg_error_t
384 0 : iso7816_get_data (int slot, int extended_mode, int tag,
385 : unsigned char **result, size_t *resultlen)
386 : {
387 : int sw;
388 : int le;
389 :
390 0 : if (!result || !resultlen)
391 0 : return gpg_error (GPG_ERR_INV_VALUE);
392 0 : *result = NULL;
393 0 : *resultlen = 0;
394 :
395 0 : if (extended_mode > 0 && extended_mode < 256)
396 0 : le = 65534; /* Not 65535 in case it is used as some special flag. */
397 0 : else if (extended_mode > 0)
398 0 : le = extended_mode;
399 : else
400 0 : le = 256;
401 :
402 0 : sw = apdu_send_le (slot, extended_mode, 0x00, CMD_GET_DATA,
403 0 : ((tag >> 8) & 0xff), (tag & 0xff), -1, NULL, le,
404 : result, resultlen);
405 0 : if (sw != SW_SUCCESS)
406 : {
407 : /* Make sure that pending buffers are released. */
408 0 : xfree (*result);
409 0 : *result = NULL;
410 0 : *resultlen = 0;
411 0 : return map_sw (sw);
412 : }
413 :
414 0 : return 0;
415 : }
416 :
417 :
418 : /* Perform a PUT DATA command on card in SLOT. Write DATA of length
419 : DATALEN to TAG. EXTENDED_MODE controls whether extended length
420 : headers or command chaining is used instead of single length
421 : bytes. */
422 : gpg_error_t
423 0 : iso7816_put_data (int slot, int extended_mode, int tag,
424 : const void *data, size_t datalen)
425 : {
426 : int sw;
427 :
428 0 : sw = apdu_send_simple (slot, extended_mode, 0x00, CMD_PUT_DATA,
429 0 : ((tag >> 8) & 0xff), (tag & 0xff),
430 : datalen, (const char*)data);
431 0 : return map_sw (sw);
432 : }
433 :
434 : /* Same as iso7816_put_data but uses an odd instruction byte. */
435 : gpg_error_t
436 0 : iso7816_put_data_odd (int slot, int extended_mode, int tag,
437 : const void *data, size_t datalen)
438 : {
439 : int sw;
440 :
441 0 : sw = apdu_send_simple (slot, extended_mode, 0x00, CMD_PUT_DATA+1,
442 0 : ((tag >> 8) & 0xff), (tag & 0xff),
443 : datalen, (const char*)data);
444 0 : return map_sw (sw);
445 : }
446 :
447 : /* Manage Security Environment. This is a weird operation and there
448 : is no easy abstraction for it. Furthermore, some card seem to have
449 : a different interpreation of 7816-8 and thus we resort to let the
450 : caller decide what to do. */
451 : gpg_error_t
452 0 : iso7816_manage_security_env (int slot, int p1, int p2,
453 : const unsigned char *data, size_t datalen)
454 : {
455 : int sw;
456 :
457 0 : if (p1 < 0 || p1 > 255 || p2 < 0 || p2 > 255 )
458 0 : return gpg_error (GPG_ERR_INV_VALUE);
459 :
460 0 : sw = apdu_send_simple (slot, 0, 0x00, CMD_MSE, p1, p2,
461 : data? datalen : -1, (const char*)data);
462 0 : return map_sw (sw);
463 : }
464 :
465 :
466 : /* Perform the security operation COMPUTE DIGITAL SIGANTURE. On
467 : success 0 is returned and the data is availavle in a newly
468 : allocated buffer stored at RESULT with its length stored at
469 : RESULTLEN. For LE see do_generate_keypair. */
470 : gpg_error_t
471 0 : iso7816_compute_ds (int slot, int extended_mode,
472 : const unsigned char *data, size_t datalen, int le,
473 : unsigned char **result, size_t *resultlen)
474 : {
475 : int sw;
476 :
477 0 : if (!data || !datalen || !result || !resultlen)
478 0 : return gpg_error (GPG_ERR_INV_VALUE);
479 0 : *result = NULL;
480 0 : *resultlen = 0;
481 :
482 0 : if (!extended_mode)
483 0 : le = 256; /* Ignore provided Le and use what apdu_send uses. */
484 0 : else if (le >= 0 && le < 256)
485 0 : le = 256;
486 :
487 0 : sw = apdu_send_le (slot, extended_mode,
488 : 0x00, CMD_PSO, 0x9E, 0x9A,
489 : datalen, (const char*)data,
490 : le,
491 : result, resultlen);
492 0 : if (sw != SW_SUCCESS)
493 : {
494 : /* Make sure that pending buffers are released. */
495 0 : xfree (*result);
496 0 : *result = NULL;
497 0 : *resultlen = 0;
498 0 : return map_sw (sw);
499 : }
500 :
501 0 : return 0;
502 : }
503 :
504 :
505 : /* Perform the security operation DECIPHER. PADIND is the padding
506 : indicator to be used. It should be 0 if no padding is required, a
507 : value of -1 suppresses the padding byte. On success 0 is returned
508 : and the plaintext is available in a newly allocated buffer stored
509 : at RESULT with its length stored at RESULTLEN. For LE see
510 : do_generate_keypair. */
511 : gpg_error_t
512 0 : iso7816_decipher (int slot, int extended_mode,
513 : const unsigned char *data, size_t datalen, int le,
514 : int padind, unsigned char **result, size_t *resultlen)
515 : {
516 : int sw;
517 : unsigned char *buf;
518 :
519 0 : if (!data || !datalen || !result || !resultlen)
520 0 : return gpg_error (GPG_ERR_INV_VALUE);
521 0 : *result = NULL;
522 0 : *resultlen = 0;
523 :
524 0 : if (!extended_mode)
525 0 : le = 256; /* Ignore provided Le and use what apdu_send uses. */
526 0 : else if (le >= 0 && le < 256)
527 0 : le = 256;
528 :
529 0 : if (padind >= 0)
530 : {
531 : /* We need to prepend the padding indicator. */
532 0 : buf = xtrymalloc (datalen + 1);
533 0 : if (!buf)
534 0 : return gpg_error (gpg_err_code_from_errno (errno));
535 :
536 0 : *buf = padind; /* Padding indicator. */
537 0 : memcpy (buf+1, data, datalen);
538 0 : sw = apdu_send_le (slot, extended_mode,
539 : 0x00, CMD_PSO, 0x80, 0x86,
540 : datalen+1, (char*)buf, le,
541 : result, resultlen);
542 0 : xfree (buf);
543 : }
544 : else
545 : {
546 0 : sw = apdu_send_le (slot, extended_mode,
547 : 0x00, CMD_PSO, 0x80, 0x86,
548 : datalen, (const char *)data, le,
549 : result, resultlen);
550 : }
551 0 : if (sw != SW_SUCCESS)
552 : {
553 : /* Make sure that pending buffers are released. */
554 0 : xfree (*result);
555 0 : *result = NULL;
556 0 : *resultlen = 0;
557 0 : return map_sw (sw);
558 : }
559 :
560 0 : return 0;
561 : }
562 :
563 :
564 : /* For LE see do_generate_keypair. */
565 : gpg_error_t
566 0 : iso7816_internal_authenticate (int slot, int extended_mode,
567 : const unsigned char *data, size_t datalen,
568 : int le,
569 : unsigned char **result, size_t *resultlen)
570 : {
571 : int sw;
572 :
573 0 : if (!data || !datalen || !result || !resultlen)
574 0 : return gpg_error (GPG_ERR_INV_VALUE);
575 0 : *result = NULL;
576 0 : *resultlen = 0;
577 :
578 0 : if (!extended_mode)
579 0 : le = 256; /* Ignore provided Le and use what apdu_send uses. */
580 0 : else if (le >= 0 && le < 256)
581 0 : le = 256;
582 :
583 0 : sw = apdu_send_le (slot, extended_mode,
584 : 0x00, CMD_INTERNAL_AUTHENTICATE, 0, 0,
585 : datalen, (const char*)data,
586 : le,
587 : result, resultlen);
588 0 : if (sw != SW_SUCCESS)
589 : {
590 : /* Make sure that pending buffers are released. */
591 0 : xfree (*result);
592 0 : *result = NULL;
593 0 : *resultlen = 0;
594 0 : return map_sw (sw);
595 : }
596 :
597 0 : return 0;
598 : }
599 :
600 :
601 : /* LE is the expected return length. This is usually 0 except if
602 : extended length mode is used and more than 256 byte will be
603 : returned. In that case a value of -1 uses a large default
604 : (e.g. 4096 bytes), a value larger 256 used that value. */
605 : static gpg_error_t
606 0 : do_generate_keypair (int slot, int extended_mode, int read_only,
607 : const unsigned char *data, size_t datalen,
608 : int le,
609 : unsigned char **result, size_t *resultlen)
610 : {
611 : int sw;
612 :
613 0 : if (!data || !datalen || !result || !resultlen)
614 0 : return gpg_error (GPG_ERR_INV_VALUE);
615 0 : *result = NULL;
616 0 : *resultlen = 0;
617 :
618 0 : sw = apdu_send_le (slot, extended_mode,
619 : 0x00, CMD_GENERATE_KEYPAIR, read_only? 0x81:0x80, 0,
620 : datalen, (const char*)data,
621 0 : le >= 0 && le < 256? 256:le,
622 : result, resultlen);
623 0 : if (sw != SW_SUCCESS)
624 : {
625 : /* Make sure that pending buffers are released. */
626 0 : xfree (*result);
627 0 : *result = NULL;
628 0 : *resultlen = 0;
629 0 : return map_sw (sw);
630 : }
631 :
632 0 : return 0;
633 : }
634 :
635 :
636 : gpg_error_t
637 0 : iso7816_generate_keypair (int slot, int extended_mode,
638 : const unsigned char *data, size_t datalen,
639 : int le,
640 : unsigned char **result, size_t *resultlen)
641 : {
642 0 : return do_generate_keypair (slot, extended_mode, 0,
643 : data, datalen, le, result, resultlen);
644 : }
645 :
646 :
647 : gpg_error_t
648 0 : iso7816_read_public_key (int slot, int extended_mode,
649 : const unsigned char *data, size_t datalen,
650 : int le,
651 : unsigned char **result, size_t *resultlen)
652 : {
653 0 : return do_generate_keypair (slot, extended_mode, 1,
654 : data, datalen, le, result, resultlen);
655 : }
656 :
657 :
658 :
659 : gpg_error_t
660 0 : iso7816_get_challenge (int slot, int length, unsigned char *buffer)
661 : {
662 : int sw;
663 : unsigned char *result;
664 : size_t resultlen, n;
665 :
666 0 : if (!buffer || length < 1)
667 0 : return gpg_error (GPG_ERR_INV_VALUE);
668 :
669 : do
670 : {
671 0 : result = NULL;
672 0 : n = length > 254? 254 : length;
673 0 : sw = apdu_send_le (slot, 0,
674 : 0x00, CMD_GET_CHALLENGE, 0, 0, -1, NULL, n,
675 : &result, &resultlen);
676 0 : if (sw != SW_SUCCESS)
677 : {
678 : /* Make sure that pending buffers are released. */
679 0 : xfree (result);
680 0 : return map_sw (sw);
681 : }
682 0 : if (resultlen > n)
683 0 : resultlen = n;
684 0 : memcpy (buffer, result, resultlen);
685 0 : buffer += resultlen;
686 0 : length -= resultlen;
687 0 : xfree (result);
688 : }
689 0 : while (length > 0);
690 :
691 0 : return 0;
692 : }
693 :
694 : /* Perform a READ BINARY command requesting a maximum of NMAX bytes
695 : from OFFSET. With NMAX = 0 the entire file is read. The result is
696 : stored in a newly allocated buffer at the address passed by RESULT.
697 : Returns the length of this data at the address of RESULTLEN. */
698 : gpg_error_t
699 0 : iso7816_read_binary (int slot, size_t offset, size_t nmax,
700 : unsigned char **result, size_t *resultlen)
701 : {
702 : int sw;
703 : unsigned char *buffer;
704 : size_t bufferlen;
705 0 : int read_all = !nmax;
706 : size_t n;
707 :
708 0 : if (!result || !resultlen)
709 0 : return gpg_error (GPG_ERR_INV_VALUE);
710 0 : *result = NULL;
711 0 : *resultlen = 0;
712 :
713 : /* We can only encode 15 bits in p0,p1 to indicate an offset. Thus
714 : we check for this limit. */
715 0 : if (offset > 32767)
716 0 : return gpg_error (GPG_ERR_INV_VALUE);
717 :
718 : do
719 : {
720 0 : buffer = NULL;
721 0 : bufferlen = 0;
722 0 : n = read_all? 0 : nmax;
723 0 : sw = apdu_send_le (slot, 0, 0x00, CMD_READ_BINARY,
724 0 : ((offset>>8) & 0xff), (offset & 0xff) , -1, NULL,
725 : n, &buffer, &bufferlen);
726 0 : if ( SW_EXACT_LENGTH_P(sw) )
727 : {
728 0 : n = (sw & 0x00ff);
729 0 : sw = apdu_send_le (slot, 0, 0x00, CMD_READ_BINARY,
730 0 : ((offset>>8) & 0xff), (offset & 0xff) , -1, NULL,
731 : n, &buffer, &bufferlen);
732 : }
733 :
734 0 : if (*result && sw == SW_BAD_P0_P1)
735 : {
736 : /* Bad Parameter means that the offset is outside of the
737 : EF. When reading all data we take this as an indication
738 : for EOF. */
739 0 : break;
740 : }
741 :
742 0 : if (sw != SW_SUCCESS && sw != SW_EOF_REACHED)
743 : {
744 : /* Make sure that pending buffers are released. */
745 0 : xfree (buffer);
746 0 : xfree (*result);
747 0 : *result = NULL;
748 0 : *resultlen = 0;
749 0 : return map_sw (sw);
750 : }
751 0 : if (*result) /* Need to extend the buffer. */
752 : {
753 0 : unsigned char *p = xtryrealloc (*result, *resultlen + bufferlen);
754 0 : if (!p)
755 : {
756 0 : gpg_error_t err = gpg_error_from_syserror ();
757 0 : xfree (buffer);
758 0 : xfree (*result);
759 0 : *result = NULL;
760 0 : *resultlen = 0;
761 0 : return err;
762 : }
763 0 : *result = p;
764 0 : memcpy (*result + *resultlen, buffer, bufferlen);
765 0 : *resultlen += bufferlen;
766 0 : xfree (buffer);
767 0 : buffer = NULL;
768 : }
769 : else /* Transfer the buffer into our result. */
770 : {
771 0 : *result = buffer;
772 0 : *resultlen = bufferlen;
773 : }
774 0 : offset += bufferlen;
775 0 : if (offset > 32767)
776 0 : break; /* We simply truncate the result for too large
777 : files. */
778 0 : if (nmax > bufferlen)
779 0 : nmax -= bufferlen;
780 : else
781 0 : nmax = 0;
782 : }
783 0 : while ((read_all && sw != SW_EOF_REACHED) || (!read_all && nmax));
784 :
785 0 : return 0;
786 : }
787 :
788 : /* Perform a READ RECORD command. RECNO gives the record number to
789 : read with 0 indicating the current record. RECCOUNT must be 1 (not
790 : all cards support reading of more than one record). SHORT_EF
791 : should be 0 to read the current EF or contain a short EF. The
792 : result is stored in a newly allocated buffer at the address passed
793 : by RESULT. Returns the length of this data at the address of
794 : RESULTLEN. */
795 : gpg_error_t
796 0 : iso7816_read_record (int slot, int recno, int reccount, int short_ef,
797 : unsigned char **result, size_t *resultlen)
798 : {
799 : int sw;
800 : unsigned char *buffer;
801 : size_t bufferlen;
802 :
803 0 : if (!result || !resultlen)
804 0 : return gpg_error (GPG_ERR_INV_VALUE);
805 0 : *result = NULL;
806 0 : *resultlen = 0;
807 :
808 : /* We can only encode 15 bits in p0,p1 to indicate an offset. Thus
809 : we check for this limit. */
810 0 : if (recno < 0 || recno > 255 || reccount != 1
811 0 : || short_ef < 0 || short_ef > 254 )
812 0 : return gpg_error (GPG_ERR_INV_VALUE);
813 :
814 0 : buffer = NULL;
815 0 : bufferlen = 0;
816 0 : sw = apdu_send_le (slot, 0, 0x00, CMD_READ_RECORD,
817 : recno,
818 : short_ef? short_ef : 0x04,
819 : -1, NULL,
820 : 0, &buffer, &bufferlen);
821 :
822 0 : if (sw != SW_SUCCESS && sw != SW_EOF_REACHED)
823 : {
824 : /* Make sure that pending buffers are released. */
825 0 : xfree (buffer);
826 0 : xfree (*result);
827 0 : *result = NULL;
828 0 : *resultlen = 0;
829 0 : return map_sw (sw);
830 : }
831 0 : *result = buffer;
832 0 : *resultlen = bufferlen;
833 :
834 0 : return 0;
835 : }
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