/* app-common.h - Common declarations for all card applications
 * Copyright (C) 2003, 2005, 2008 Free Software Foundation, Inc.
 *
 * This file is part of GnuPG.
 *
 * GnuPG 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 of the License, or
 * (at your option) any later version.
 *
 * GnuPG 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 this program; if not, see <https://www.gnu.org/licenses/>.
 *
 * $Id$
 */

#ifndef GNUPG_SCD_APP_COMMON_H
#define GNUPG_SCD_APP_COMMON_H

#include <npth.h>
#include <ksba.h>

/* Flags used with app_change_pin.  */
#define APP_CHANGE_FLAG_RESET    1  /* PIN Reset mode.  */
#define APP_CHANGE_FLAG_NULLPIN  2  /* NULL PIN mode.  */
#define APP_CHANGE_FLAG_CLEAR    4  /* Clear the given PIN.  */

/* Flags used with app_genkey.  */
#define APP_GENKEY_FLAG_FORCE    1  /* Force overwriting existing key.  */

/* Flags used with app_writekey.  */
#define APP_WRITEKEY_FLAG_FORCE  1  /* Force overwriting existing key.  */

/* Flags used with app_readkey.  */
#define APP_READKEY_FLAG_INFO    1  /* Send also a KEYPAIRINFO line.  */

/* Flags set by the decipher function into R_INFO.  */
#define APP_DECIPHER_INFO_NOPAD  1  /* Padding has been removed.  */

/* Flags used by the app_write_learn_status.  */
#define APP_LEARN_FLAG_KEYPAIRINFO  1 /* Return only keypair infos.  */
#define APP_LEARN_FLAG_MULTI        2 /* Return info for all apps.  */


/* List of supported card types.  Generic is the usual ISO7817-4
 * compliant card.  More specific card or token versions can be given
 * here.  Use strcardtype() to map them to a string. */
typedef enum
  {
   CARDTYPE_GENERIC = 0,
   CARDTYPE_YUBIKEY

  } cardtype_t;

/* List of supported card applications.  The source code for each
 * application can usually be found in an app-NAME.c file.  Use
 * strapptype() to map them to a string.  */
typedef enum
  {
   APPTYPE_NONE = 0,
   APPTYPE_UNDEFINED,
   APPTYPE_OPENPGP,
   APPTYPE_PIV,
   APPTYPE_NKS,
   APPTYPE_P15,
   APPTYPE_GELDKARTE,
   APPTYPE_DINSIG,
   APPTYPE_SC_HSM
  } apptype_t;


/* Forward declarations.  */
struct card_ctx_s;
struct app_ctx_s;
struct app_local_s;  /* Defined by all app-*.c.  */


typedef struct card_ctx_s *card_t;
typedef struct app_ctx_s *app_t;

/* The object describing a card.  */
struct card_ctx_s {
  card_t next;

  npth_mutex_t lock;

  /* Number of connections currently using this application context.  */
  unsigned int ref_count;

  /* Used reader slot. */
  int slot;

  cardtype_t cardtype;     /* The token's type.  */
  unsigned int cardversion;/* Firmware version of the token or 0.  */

  unsigned int card_status;

  /* The serial number is associated with the card and not with a
   * specific app.  If a card uses different serial numbers for its
   * applications, our code picks the serial number of a specific
   * application and uses that.  */
  unsigned char *serialno; /* Serialnumber in raw form, allocated. */
  size_t serialnolen;      /* Length in octets of serialnumber. */

  /* A linked list of applications used on this card.  The app at the
   * head of the list is the currently active app; To work with the
   * other apps, switching to that app might be needed.  Switching will
   * put the active app at the head of the list.  */
  app_t app;

  /* Various flags.  */
  unsigned int reset_requested:1;
  unsigned int periodical_check_needed:1;
};


/* The object describing a card's applications.  A card may have
 * several applications and it is usuallay required to explicity
 * switch between applications.  */
struct app_ctx_s {
  app_t next;

  card_t card;  /* Link back to the card.  */

  apptype_t apptype;       /* The type of the application.  */
  unsigned int appversion; /* Version of the application or 0.     */
  unsigned int did_chv1:1;
  unsigned int force_chv1:1;   /* True if the card does not cache CHV1. */
  unsigned int did_chv2:1;
  unsigned int did_chv3:1;
  struct app_local_s *app_local;  /* Local to the application. */
  struct {
    void (*deinit) (app_t app);
    gpg_error_t (*prep_reselect) (app_t app, ctrl_t ctrl);
    gpg_error_t (*reselect) (app_t app, ctrl_t ctrl);
    gpg_error_t (*learn_status) (app_t app, ctrl_t ctrl, unsigned int flags);
    gpg_error_t (*readcert) (app_t app, const char *certid,
                     unsigned char **cert, size_t *certlen);
    gpg_error_t (*readkey) (app_t app, ctrl_t ctrl,
                            const char *certid, unsigned int flags,
                            unsigned char **pk, size_t *pklen);
    gpg_error_t (*getattr) (app_t app, ctrl_t ctrl, const char *name);
    gpg_error_t (*setattr) (app_t app, ctrl_t ctrl, const char *name,
                    gpg_error_t (*pincb)(void*, const char *, char **),
                    void *pincb_arg,
                    const unsigned char *value, size_t valuelen);
    gpg_error_t (*sign) (app_t app, ctrl_t ctrl,
                 const char *keyidstr, int hashalgo,
                 gpg_error_t (*pincb)(void*, const char *, char **),
                 void *pincb_arg,
                 const void *indata, size_t indatalen,
                 unsigned char **outdata, size_t *outdatalen );
    gpg_error_t (*auth) (app_t app, ctrl_t ctrl, const char *keyidstr,
                 gpg_error_t (*pincb)(void*, const char *, char **),
                 void *pincb_arg,
                 const void *indata, size_t indatalen,
                 unsigned char **outdata, size_t *outdatalen);
    gpg_error_t (*decipher) (app_t app, ctrl_t ctrl, const char *keyidstr,
                             gpg_error_t (*pincb)(void*, const char *, char **),
                             void *pincb_arg,
                             const void *indata, size_t indatalen,
                             unsigned char **outdata, size_t *outdatalen,
                             unsigned int *r_info);
    gpg_error_t (*writecert) (app_t app, ctrl_t ctrl,
                              const char *certid,
                              gpg_error_t (*pincb)(void*,const char *,char **),
                              void *pincb_arg,
                              const unsigned char *data, size_t datalen);
    gpg_error_t (*writekey) (app_t app, ctrl_t ctrl,
                             const char *keyid, unsigned int flags,
                             gpg_error_t (*pincb)(void*,const char *,char **),
                             void *pincb_arg,
                             const unsigned char *pk, size_t pklen);
    gpg_error_t (*genkey) (app_t app, ctrl_t ctrl,
                           const char *keyref, const char *keytype,
                           unsigned int flags, time_t createtime,
                           gpg_error_t (*pincb)(void*, const char *, char **),
                           void *pincb_arg);
    gpg_error_t (*change_pin) (app_t app, ctrl_t ctrl,
                       const char *chvnostr, unsigned int flags,
                       gpg_error_t (*pincb)(void*, const char *, char **),
                       void *pincb_arg);
    gpg_error_t (*check_pin) (app_t app, ctrl_t ctrl, const char *keyidstr,
                      gpg_error_t (*pincb)(void*, const char *, char **),
                      void *pincb_arg);
    gpg_error_t (*with_keygrip) (app_t app, ctrl_t ctrl, int action,
                                 const char *keygrip_str, int capability);
  } fnc;
};


/* Action values for app_do_with_keygrip.  */
enum
 {
  KEYGRIP_ACTION_SEND_DATA,
  KEYGRIP_ACTION_WRITE_STATUS,
  KEYGRIP_ACTION_LOOKUP
 };


/* Helper to get the slot from an APP object. */
static inline int
app_get_slot (app_t app)
{
  if (app && app->card)
    return app->card->slot;
  return -1;
}


/*-- app-help.c --*/
unsigned int app_help_count_bits (const unsigned char *a, size_t len);
gpg_error_t app_help_get_keygrip_string_pk (const void *pk, size_t pklen,
                                            char *hexkeygrip);
gpg_error_t app_help_get_keygrip_string (ksba_cert_t cert, char *hexkeygrip);
gpg_error_t app_help_pubkey_from_cert (const void *cert, size_t certlen,
                                       unsigned char **r_pk, size_t *r_pklen);
size_t app_help_read_length_of_cert (int slot, int fid, size_t *r_certoff);


/*-- app.c --*/
const char *strcardtype (cardtype_t t);
const char *strapptype (apptype_t t);

void app_update_priority_list (const char *arg);
gpg_error_t app_send_card_list (ctrl_t ctrl);
gpg_error_t app_send_active_apps (card_t card, ctrl_t ctrl);
char *card_get_serialno (card_t card);
char *app_get_serialno (app_t app);

void app_dump_state (void);
void application_notify_card_reset (int slot);
gpg_error_t check_application_conflict (card_t card, const char *name,
                                        const unsigned char *serialno_bin,
                                        size_t serialno_bin_len);
gpg_error_t card_reset (card_t card, ctrl_t ctrl, int send_reset);
gpg_error_t select_application (ctrl_t ctrl, const char *name, card_t *r_app,
                                int scan, const unsigned char *serialno_bin,
                                size_t serialno_bin_len);
gpg_error_t select_additional_application (ctrl_t ctrl, const char *name);

gpg_error_t app_switch_current_card (ctrl_t ctrl,
                                     const unsigned char *serialno,
                                     size_t serialnolen);
gpg_error_t app_switch_active_app (card_t card, ctrl_t ctrl,
                                   const char *appname);

char *get_supported_applications (void);

card_t card_ref (card_t card);
void   card_unref (card_t card);
void   card_unref_locked (card_t card);

gpg_error_t app_munge_serialno (card_t card);
gpg_error_t app_write_learn_status (card_t card, ctrl_t ctrl,
                                    unsigned int flags);
gpg_error_t app_readcert (card_t card, ctrl_t ctrl, const char *certid,
                  unsigned char **cert, size_t *certlen);
gpg_error_t app_readkey (card_t card, ctrl_t ctrl,
                         const char *keyid, unsigned int flags,
                         unsigned char **pk, size_t *pklen);
gpg_error_t app_getattr (card_t card, ctrl_t ctrl, const char *name);
gpg_error_t app_setattr (card_t card, ctrl_t ctrl, const char *name,
                         gpg_error_t (*pincb)(void*, const char *, char **),
                         void *pincb_arg,
                         const unsigned char *value, size_t valuelen);
gpg_error_t app_sign (card_t card, ctrl_t ctrl,
                      const char *keyidstr, int hashalgo,
                      gpg_error_t (*pincb)(void*, const char *, char **),
                      void *pincb_arg,
                      const void *indata, size_t indatalen,
                      unsigned char **outdata, size_t *outdatalen);
gpg_error_t app_auth (card_t card, ctrl_t ctrl, const char *keyidstr,
                      gpg_error_t (*pincb)(void*, const char *, char **),
                      void *pincb_arg,
                      const void *indata, size_t indatalen,
                      unsigned char **outdata, size_t *outdatalen);
gpg_error_t app_decipher (card_t card, ctrl_t ctrl, const char *keyidstr,
                          gpg_error_t (*pincb)(void*, const char *, char **),
                          void *pincb_arg,
                          const void *indata, size_t indatalen,
                          unsigned char **outdata, size_t *outdatalen,
                          unsigned int *r_info);
gpg_error_t app_writecert (card_t card, ctrl_t ctrl,
                           const char *certidstr,
                           gpg_error_t (*pincb)(void*, const char *, char **),
                           void *pincb_arg,
                           const unsigned char *keydata, size_t keydatalen);
gpg_error_t app_writekey (card_t card, ctrl_t ctrl,
                          const char *keyidstr, unsigned int flags,
                          gpg_error_t (*pincb)(void*, const char *, char **),
                          void *pincb_arg,
                          const unsigned char *keydata, size_t keydatalen);
gpg_error_t app_genkey (card_t card, ctrl_t ctrl,
                        const char *keynostr, const char *keytype,
                        unsigned int flags, time_t createtime,
                        gpg_error_t (*pincb)(void*, const char *, char **),
                        void *pincb_arg);
gpg_error_t app_get_challenge (card_t card, ctrl_t ctrl, size_t nbytes,
                               unsigned char *buffer);
gpg_error_t app_change_pin (card_t card, ctrl_t ctrl,
                            const char *chvnostr, unsigned int flags,
                            gpg_error_t (*pincb)(void*, const char *, char **),
                            void *pincb_arg);
gpg_error_t app_check_pin (card_t card, ctrl_t ctrl, const char *keyidstr,
                           gpg_error_t (*pincb)(void*, const char *, char **),
                           void *pincb_arg);
card_t app_do_with_keygrip (ctrl_t ctrl, int action, const char *keygrip_str,
                            int capability);


/*-- app-openpgp.c --*/
gpg_error_t app_select_openpgp (app_t app);

/*-- app-nks.c --*/
gpg_error_t app_select_nks (app_t app);

/*-- app-dinsig.c --*/
gpg_error_t app_select_dinsig (app_t app);

/*-- app-p15.c --*/
gpg_error_t app_select_p15 (app_t app);

/*-- app-geldkarte.c --*/
gpg_error_t app_select_geldkarte (app_t app);

/*-- app-sc-hsm.c --*/
gpg_error_t app_select_sc_hsm (app_t app);

/*-- app-piv.c --*/
gpg_error_t app_select_piv (app_t app);


#endif /*GNUPG_SCD_APP_COMMON_H*/