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7db161552c
* card.c (card_open): set it here. * card-p15.c (p15_prepare_key): Factored out common code from ... (p15_sign, p15_decipher): here and made the decryption work the regular way.
423 lines
13 KiB
C
423 lines
13 KiB
C
/* card.c - SCdaemon card functions
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* Copyright (C) 2002 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <opensc-pkcs15.h>
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#include <ksba.h>
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#if SC_MAX_SEC_ATTR_SIZE < 36
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# error This is not the patched OpenSC version
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#endif
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#include "scdaemon.h"
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#include "card-common.h"
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/* Map the SC error codes to the GNUPG ones */
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int
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map_sc_err (int rc)
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{
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switch (rc)
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{
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case 0: rc = 0; break;
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case SC_ERROR_CMD_TOO_SHORT: rc = GNUPG_Card_Error; break;
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case SC_ERROR_CMD_TOO_LONG: rc = GNUPG_Card_Error; break;
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case SC_ERROR_NOT_SUPPORTED: rc = GNUPG_Not_Supported; break;
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case SC_ERROR_TRANSMIT_FAILED: rc = GNUPG_Card_Error; break;
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case SC_ERROR_FILE_NOT_FOUND: rc = GNUPG_Card_Error; break;
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case SC_ERROR_INVALID_ARGUMENTS: rc = GNUPG_Card_Error; break;
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case SC_ERROR_PKCS15_APP_NOT_FOUND: rc = GNUPG_No_PKCS15_App; break;
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case SC_ERROR_REQUIRED_PARAMETER_NOT_FOUND: rc = GNUPG_Card_Error; break;
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case SC_ERROR_OUT_OF_MEMORY: rc = GNUPG_Out_Of_Core; break;
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case SC_ERROR_NO_READERS_FOUND: rc = GNUPG_Card_Error; break;
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case SC_ERROR_OBJECT_NOT_VALID: rc = GNUPG_Card_Error; break;
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case SC_ERROR_ILLEGAL_RESPONSE: rc = GNUPG_Card_Error; break;
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case SC_ERROR_PIN_CODE_INCORRECT: rc = GNUPG_Card_Error; break;
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case SC_ERROR_SECURITY_STATUS_NOT_SATISFIED: rc = GNUPG_Card_Error; break;
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case SC_ERROR_CONNECTING_TO_RES_MGR: rc = GNUPG_Card_Error; break;
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case SC_ERROR_INVALID_ASN1_OBJECT: rc = GNUPG_Card_Error; break;
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case SC_ERROR_BUFFER_TOO_SMALL: rc = GNUPG_Card_Error; break;
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case SC_ERROR_CARD_NOT_PRESENT: rc = GNUPG_Card_Not_Present; break;
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case SC_ERROR_RESOURCE_MANAGER: rc = GNUPG_Card_Error; break;
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case SC_ERROR_CARD_REMOVED: rc = GNUPG_Card_Removed; break;
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case SC_ERROR_INVALID_PIN_LENGTH: rc = GNUPG_Card_Error; break;
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case SC_ERROR_UNKNOWN_SMARTCARD: rc = GNUPG_Card_Error; break;
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case SC_ERROR_UNKNOWN_REPLY: rc = GNUPG_Card_Error; break;
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case SC_ERROR_OBJECT_NOT_FOUND: rc = GNUPG_Card_Error; break;
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case SC_ERROR_CARD_RESET: rc = GNUPG_Card_Reset; break;
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case SC_ERROR_ASN1_OBJECT_NOT_FOUND: rc = GNUPG_Card_Error; break;
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case SC_ERROR_ASN1_END_OF_CONTENTS: rc = GNUPG_Card_Error; break;
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case SC_ERROR_TOO_MANY_OBJECTS: rc = GNUPG_Card_Error; break;
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case SC_ERROR_INVALID_CARD: rc = GNUPG_Invalid_Card; break;
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case SC_ERROR_WRONG_LENGTH: rc = GNUPG_Card_Error; break;
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case SC_ERROR_RECORD_NOT_FOUND: rc = GNUPG_Card_Error; break;
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case SC_ERROR_INTERNAL: rc = GNUPG_Card_Error; break;
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default: rc = GNUPG_Card_Error; break;
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}
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return rc;
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}
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/* Get the keygrip from CERT, return 0 on success */
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int
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card_help_get_keygrip (KsbaCert cert, unsigned char *array)
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{
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GCRY_SEXP s_pkey;
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int rc;
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KsbaSexp p;
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size_t n;
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p = ksba_cert_get_public_key (cert);
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if (!p)
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return -1; /* oops */
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n = gcry_sexp_canon_len (p, 0, NULL, NULL);
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if (!n)
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return -1; /* libksba did not return a proper S-expression */
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rc = gcry_sexp_sscan ( &s_pkey, NULL, p, n);
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xfree (p);
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if (rc)
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return -1; /* can't parse that S-expression */
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array = gcry_pk_get_keygrip (s_pkey, array);
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gcry_sexp_release (s_pkey);
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if (!array)
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return -1; /* failed to calculate the keygrip */
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return 0;
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}
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/* Create a new context for the card and figures out some basic
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information of the card. Detects whgether a PKCS_15 application is
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stored.
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Common errors: GNUPG_Card_Not_Present */
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int
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card_open (CARD *rcard)
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{
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CARD card;
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int rc;
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card = xtrycalloc (1, sizeof *card);
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if (!card)
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return GNUPG_Out_Of_Core;
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card->reader = 0;
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rc = sc_establish_context (&card->ctx, "scdaemon");
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if (rc)
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{
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log_error ("failed to establish SC context: %s\n", sc_strerror (rc));
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rc = map_sc_err (rc);
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goto leave;
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}
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if (card->reader >= card->ctx->reader_count)
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{
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log_error ("no card reader available\n");
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rc = GNUPG_Card_Error;
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goto leave;
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}
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card->ctx->error_file = log_get_stream ();
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card->ctx->debug = opt.debug_sc;
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card->ctx->debug_file = log_get_stream ();
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if (sc_detect_card_presence (card->ctx->reader[card->reader], 0) != 1)
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{
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rc = GNUPG_Card_Not_Present;
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goto leave;
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}
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rc = sc_connect_card (card->ctx->reader[card->reader], 0, &card->scard);
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if (rc)
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{
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log_error ("failed to connect card in reader %d: %s\n",
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card->reader, sc_strerror (rc));
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rc = map_sc_err (rc);
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goto leave;
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}
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if (opt.verbose)
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log_info ("connected to card in reader %d using driver `%s'\n",
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card->reader, card->scard->driver->name);
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rc = sc_lock (card->scard);
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if (rc)
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{
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log_error ("can't lock card in reader %d: %s\n",
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card->reader, sc_strerror (rc));
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rc = map_sc_err (rc);
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goto leave;
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}
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leave:
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if (rc)
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card_close (card);
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else
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*rcard = card;
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return rc;
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}
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/* Close a card and release all resources */
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void
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card_close (CARD card)
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{
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if (card)
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{
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if (card->p15card)
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{
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sc_pkcs15_unbind (card->p15card);
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card->p15card = NULL;
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}
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if (card->scard)
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{
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sc_unlock (card->scard);
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sc_disconnect_card (card->scard, 0);
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card->scard = NULL;
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}
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if (card->ctx)
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{
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sc_release_context (card->ctx);
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card->ctx = NULL;
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}
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xfree (card);
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}
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}
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/* Retrieve the serial number and the time of the last update of the
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card. The serial number is returned as a malloced string (hex
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encoded) in SERIAL and the time of update is returned in STAMP.
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If no update time is available the returned value is 0. The serial
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is mandatory for a PKCS_15 application and an error will be
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returned if this value is not availbale. For non-PKCS-15 cards a
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serial number is constructed by other means. Caller must free
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SERIAL unless the function returns an error. */
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int
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card_get_serial_and_stamp (CARD card, char **serial, time_t *stamp)
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{
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char *s;
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int rc;
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struct sc_path path;
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struct sc_file *file;
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unsigned char buf[12];
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int i;
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if (!card || !serial || !stamp)
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return GNUPG_Invalid_Value;
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*serial = NULL;
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*stamp = 0; /* not available */
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if (!card->fnc.initialized)
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{
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card->fnc.initialized = 1;
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/* The first use of this card tries to figure out the type of the card
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and sets up the function pointers. */
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rc = sc_pkcs15_bind (card->scard, &card->p15card);
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if (rc)
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{
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if (rc != SC_ERROR_PKCS15_APP_NOT_FOUND)
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log_error ("binding of existing PKCS-15 failed in reader %d: %s\n",
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card->reader, sc_strerror (rc));
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card->p15card = NULL;
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rc = 0;
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}
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if (card->p15card)
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card_p15_bind (card);
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else
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card_dinsig_bind (card);
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card->fnc.initialized = 1;
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}
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/* We should lookup the iso 7812-1 and 8583-3 - argh ISO
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practice is suppressing innovation - IETF rules! So we
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always get the serialnumber from the 2F02 GDO file. */
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/* FIXME: in case we can't parse the 2F02 EF and we have a P15 card,
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we should get the serial number from the respective P15 file */
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sc_format_path ("3F002F02", &path);
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rc = sc_select_file (card->scard, &path, &file);
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if (rc)
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{
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log_error ("sc_select_file failed: %s\n", sc_strerror (rc));
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return GNUPG_Card_Error;
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}
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if (file->type != SC_FILE_TYPE_WORKING_EF
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|| file->ef_structure != SC_FILE_EF_TRANSPARENT)
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{
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log_error ("wrong type or structure of GDO file\n");
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sc_file_free (file);
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return GNUPG_Card_Error;
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}
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if (file->size != 12)
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{ /* FIXME: Use a real parser */
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log_error ("unsupported size of GDO file\n");
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sc_file_free (file);
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return GNUPG_Card_Error;
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}
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rc = sc_read_binary (card->scard, 0, buf, DIM (buf), 0);
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sc_file_free (file);
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if (rc < 0)
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{
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log_error ("error reading GDO file: %s\n", sc_strerror (rc));
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return GNUPG_Card_Error;
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}
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if (rc != file->size)
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{
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log_error ("short read on GDO file\n");
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return GNUPG_Card_Error;
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}
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if (buf[0] != 0x5a || buf[1] != 10)
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{
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log_error ("invalid structure of GDO file\n");
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return GNUPG_Card_Error;
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}
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*serial = s = xtrymalloc (21);
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if (!*serial)
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return GNUPG_Out_Of_Core;
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for (i=0; i < 10; i++, s += 2)
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sprintf (s, "%02X", buf[2+i]);
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return 0;
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}
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/* Enumerate all keypairs on the card and return the Keygrip as well
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as the internal identification of the key. KEYGRIP must be a
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caller provided buffer with a size of 20 bytes which will receive
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the KEYGRIP of the keypair. If KEYID is not NULL, it returns the
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ID field of the key in allocated memory; this is a string without
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spaces. The function returns -1 when all keys have been
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enumerated. Note that the error GNUPG_Missing_Certificate may be
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returned if there is just the private key but no public key (ie.e a
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certificate) available. Applications might want to continue
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enumerating after this error.*/
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int
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card_enum_keypairs (CARD card, int idx,
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unsigned char *keygrip,
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char **keyid)
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{
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int rc;
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if (keyid)
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*keyid = NULL;
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if (!card || !keygrip)
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return GNUPG_Invalid_Value;
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if (idx < 0)
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return GNUPG_Invalid_Index;
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if (!card->fnc.initialized)
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return GNUPG_Card_Not_Initialized;
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if (!card->fnc.enum_keypairs)
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return GNUPG_Unsupported_Operation;
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rc = card->fnc.enum_keypairs (card, idx, keygrip, keyid);
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if (opt.verbose)
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log_info ("card operation enum_keypairs result: %s\n",
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gnupg_strerror (rc));
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return rc;
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}
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/* Read the certificate identified by CERTIDSTR which is the
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hexadecimal encoded ID of the certificate, prefixed with the string
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"3F005015.". The certificate is return in DER encoded form in CERT
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and NCERT. */
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int
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card_read_cert (CARD card, const char *certidstr,
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unsigned char **cert, size_t *ncert)
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{
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int rc;
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if (!card || !certidstr || !cert || !ncert)
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return GNUPG_Invalid_Value;
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if (!card->fnc.initialized)
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return GNUPG_Card_Not_Initialized;
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if (!card->fnc.read_cert)
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return GNUPG_Unsupported_Operation;
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rc = card->fnc.read_cert (card, certidstr, cert, ncert);
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if (opt.verbose)
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log_info ("card operation read_cert result: %s\n", gnupg_strerror (rc));
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return rc;
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}
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/* Create the signature and return the allocated result in OUTDATA.
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If a PIN is required the PINCB will be used to ask for the PIN; it
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should return the PIN in an allocated buffer and put it into PIN. */
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int
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card_sign (CARD card, const char *keyidstr, int hashalgo,
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int (pincb)(void*, const char *, char **),
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void *pincb_arg,
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const void *indata, size_t indatalen,
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void **outdata, size_t *outdatalen )
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{
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int rc;
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if (!card || !indata || !indatalen || !outdata || !outdatalen || !pincb)
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return GNUPG_Invalid_Value;
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if (!card->fnc.initialized)
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return GNUPG_Card_Not_Initialized;
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if (!card->fnc.sign)
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return GNUPG_Unsupported_Operation;
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rc = card->fnc.sign (card, keyidstr, hashalgo,
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pincb, pincb_arg,
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indata, indatalen,
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outdata, outdatalen);
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if (opt.verbose)
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log_info ("card operation sign result: %s\n", gnupg_strerror (rc));
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return rc;
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}
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/* Create the signature and return the allocated result in OUTDATA.
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If a PIN is required the PINCB will be used to ask for the PIN; it
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should return the PIN in an allocated buffer and put it into PIN. */
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int
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card_decipher (CARD card, const char *keyidstr,
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int (pincb)(void*, const char *, char **),
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void *pincb_arg,
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const void *indata, size_t indatalen,
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void **outdata, size_t *outdatalen )
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{
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int rc;
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if (!card || !indata || !indatalen || !outdata || !outdatalen || !pincb)
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return GNUPG_Invalid_Value;
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if (!card->fnc.initialized)
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return GNUPG_Card_Not_Initialized;
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if (!card->fnc.decipher)
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return GNUPG_Unsupported_Operation;
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rc = card->fnc.decipher (card, keyidstr,
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pincb, pincb_arg,
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indata, indatalen,
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outdata, outdatalen);
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if (opt.verbose)
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log_info ("card operation decipher result: %s\n", gnupg_strerror (rc));
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return rc;
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}
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