blue-app-openpgp-card/src/gpg_main.c

/* Copyright 2017 Cedric Mesnil <cslashm@gmail.com>, Ledger SAS
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef GPG_DEBUG_MAIN

#include "os.h"
#include "cx.h"
#include "gpg_types.h"
#include "gpg_api.h"
#include "gpg_vars.h"

#include "gpg_ux_nanos.h"
//#include "gpg_ux_blue.h"

#include "os_io_seproxyhal.h"
#include "string.h"
#include "glyphs.h"


/* ----------------------------------------------------------------------- */
/* ---                            Application Entry                    --- */
/* ----------------------------------------------------------------------- */

void gpg_main(void) {
  unsigned int io_flags;
  io_flags = 0;
  for (;;) {
    volatile unsigned short sw = 0;
    BEGIN_TRY {
      TRY {
        gpg_io_do(io_flags);
        sw = gpg_dispatch();
      }
      CATCH_OTHER(e) {
        gpg_io_discard(1);
        if ( (e & 0xFFFF0000) ||
             ( ((e&0xF000)!=0x6000) && ((e&0xF000)!=0x9000) ) ) {
          gpg_io_insert_u32(e);
          sw = 0x6f42;
        } else {
          sw = e;
        }
      }
      FINALLY {
        if (sw) {
          gpg_io_insert_u16(sw);
          io_flags = 0;
        } else {
          io_flags = IO_ASYNCH_REPLY;
        }
      }
    }
    END_TRY;
  }

}


unsigned char io_event(unsigned char channel) {
  // nothing done with the event, throw an error on the transport layer if
  // needed
  // can't have more than one tag in the reply, not supported yet.
  switch (G_io_seproxyhal_spi_buffer[0]) {
  case SEPROXYHAL_TAG_FINGER_EVENT:
    UX_FINGER_EVENT(G_io_seproxyhal_spi_buffer);
    break;
  // power off if long push, else pass to the application callback if any
  case SEPROXYHAL_TAG_BUTTON_PUSH_EVENT: // for Nano S
    UX_BUTTON_PUSH_EVENT(G_io_seproxyhal_spi_buffer);
    break;


  // other events are propagated to the UX just in case
  default:
    UX_DEFAULT_EVENT();
    break;

  case SEPROXYHAL_TAG_DISPLAY_PROCESSED_EVENT:
    UX_DISPLAYED_EVENT({});
    break;
  case SEPROXYHAL_TAG_TICKER_EVENT:
    UX_TICKER_EVENT(G_io_seproxyhal_spi_buffer, 
    {
       // only allow display when not locked of overlayed by an OS UX.
      if (UX_ALLOWED ) {
        UX_REDISPLAY(); 
      }
    });
    break;
  }

  // close the event if not done previously (by a display or whatever)
  if (!io_seproxyhal_spi_is_status_sent()) {
    io_seproxyhal_general_status();
  }
  // command has been processed, DO NOT reset the current APDU transport
  return 1;
}

unsigned short io_exchange_al(unsigned char channel, unsigned short tx_len) {
  switch (channel & ~(IO_FLAGS)) {
  case CHANNEL_KEYBOARD:
    break;

    // multiplexed io exchange over a SPI channel and TLV encapsulated protocol
  case CHANNEL_SPI:
    if (tx_len) {
      io_seproxyhal_spi_send(G_io_apdu_buffer, tx_len);

      if (channel & IO_RESET_AFTER_REPLIED) {
        reset();
      }
      return 0; // nothing received from the master so far (it's a tx
      // transaction)
    } else {
      return io_seproxyhal_spi_recv(G_io_apdu_buffer,
                                    sizeof(G_io_apdu_buffer), 0);
    }

  default:
    THROW(INVALID_PARAMETER);
    return 0;
  }
  return 0;
}

void app_exit(void) {
  BEGIN_TRY_L(exit) {
    TRY_L(exit) {
      os_sched_exit(-1);
    }
    FINALLY_L(exit) {
    }
  }
  END_TRY_L(exit);
}

/* -------------------------------------------------------------- */

__attribute__((section(".boot"))) int main(void) {
  // exit critical section
  __asm volatile("cpsie i");


  // ensure exception will work as planned
  os_boot();
  for(;;) {
    UX_INIT();

    BEGIN_TRY {
      TRY {
      
        //start communication with MCU
        io_seproxyhal_init();

        USB_CCID_power(1);
        io_usb_ccid_set_card_inserted(1);
  

        //set up
        gpg_init();
  
        //set up initial screen
        ui_init();



        //start the application
        //the first exchange will:
        // - display the  initial screen
        // - send the ATR
        // - receive the first command
        gpg_main();
      }
      CATCH(EXCEPTION_IO_RESET) {
                // reset IO and UX
        continue;
      }
      CATCH_ALL {
        break;
      }
      FINALLY {
      }
    }
    END_TRY;
  }
  app_exit();
}

#endif