Class: PICC

Inherits:
Object
  • Object
show all
Defined in:
lib/picc.rb

Constant Summary collapse

FSCI_to_FSC =
[16, 24, 32, 40, 48, 64, 96, 128, 256]
CMD_RATS =
0xE0
CMD_PPS =
0xD0
CMD_DESELECT =
0xC2
CMD_ADDITIONAL_FRAME =
0xAF

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(pcd, uid, sak) ⇒ PICC

Returns a new instance of PICC.


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# File 'lib/picc.rb', line 12

def initialize(pcd, uid, sak)
  @pcd = pcd
  @uid = uid
  @sak = sak
  @halted = false

  ## ISO mode
  @cid = 0x00 # We don't support CID, fix it to 0
  @fsc = 16 # Assume PICC only supports 16 bytes frame
  @fwt = 256 # 77.33ms(256 ticks) default frame waiting time
  @picc_support_cid = false # PICC support for CID
  @picc_support_nad = false # PICC support for NAD
  @historical_byte = []
  @block_number = 0 # ISO frame block number
  @iso_selected = false # If card is in iso mode
end

Instance Attribute Details

#sakObject (readonly)

Returns the value of attribute sak.


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# File 'lib/picc.rb', line 10

def sak
  @sak
end

#uidObject (readonly)

Returns the value of attribute uid.


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# File 'lib/picc.rb', line 9

def uid
  @uid
end

Class Method Details

.identify_model(sak) ⇒ Object


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# File 'lib/picc.rb', line 154

def self.identify_model(sak)
  # SAK coding separation reference:
  # https://www.nxp.com/docs/en/application-note/AN10833.pdf
  # https://www.nxp.com/docs/en/application-note/AN10834.pdf
  if sak & 0x04 != 0
    return :picc_uid_not_complete
  end

  if sak & 0x02 != 0
    return :picc_reserved_future_use
  end

  if sak & 0x08 != 0
    if sak & 0x10 != 0
      return :picc_mifare_4k
    end

    if sak & 0x01 != 0
      return :picc_mifare_mini
    end

    return :picc_mifare_1k
  end

  if sak & 0x10 != 0
    if sak & 0x01 != 0
      return :picc_mifare_plus_4k_sl2
    end

    return :picc_mifare_plus_2k_sl2
  end

  if sak == 0x00
    return :picc_mifare_ultralight
  end

  if sak & 0x20 != 0
    return :picc_iso_14443_4
  end

  if sak & 0x40 != 0
    return :picc_iso_18092
  end

  return :picc_unknown
end

Instance Method Details

#haltObject


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# File 'lib/picc.rb', line 149

def halt
  iso_deselect if @iso_selected
  @halted = @pcd.picc_halt
end

#iso_deselectObject

Send S(DESELECT)


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# File 'lib/picc.rb', line 130

def iso_deselect
  buffer = [CMD_DESELECT]
  received_data = picc_transceive(buffer)

  result = received_data[0] & 0xF7 == CMD_DESELECT
  @iso_selected = !result
  result
end

#iso_selectObject

ISO/IEC 14443-4 select


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# File 'lib/picc.rb', line 105

def iso_select
  # Send RATS (Request for Answer To Select)
  buffer = [CMD_RATS, 0x50 | @cid]
  received_data = picc_transceive(buffer)

  process_ats(received_data)

  # Send PPS (Protocol and Parameter Selection Request)
  buffer = [CMD_PPS | @cid, 0x11, (@dsi << 2) | @dri]
  received_data = picc_transceive(buffer)
  raise UnexpectedDataError, 'Incorrect response' if received_data[0] != (0xD0 | @cid)

  # Set PCD baud rate
  @pcd.transceiver_baud_rate(:tx, @dri)
  @pcd.transceiver_baud_rate(:rx, @dsi)

  @block_number = 0
  @max_frame_size = [@pcd.buffer_size, @fsc].min
  @max_inf_size = @max_frame_size - 3 # PCB + CRC16
  @max_inf_size -= 1 if @picc_support_cid
  @max_inf_size -= 1 if @picc_support_nad
  @iso_selected = true
end

#iso_transceive(send_data) ⇒ Object

Wrapper for handling ISO protocol


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# File 'lib/picc.rb', line 39

def iso_transceive(send_data)
  # Split data according to max buffer size
  send_data = [send_data] unless send_data.is_a? Array
  chained_data = send_data.each_slice(@max_inf_size).to_a

  # Initialize I-block
  pcb = 0x02

  # Send chained data
  until chained_data.empty?
    pcb &= 0xEF # Reset chaining indicator
    pcb |= 0x10 if chained_data.size > 1 # Set chaining
    pcb |= @block_number # Set block number
    data = chained_data.shift

    buffer = [pcb] + data

    finished = false
    until finished
      received_data = handle_wtx(buffer)

      # Retreive response pcb from data
      r_pcb = received_data[0]

      # Received ACK
      if r_pcb & 0xF6 == 0xA2
        # If ACK matches current block number means success
        # Otherwise transmit it again
        if (pcb & 0x01) == (r_pcb & 0x01)
          finished = true
        end
      else
        finished = true
      end
    end

    @block_number ^= 1 # toggle block number for next frame
  end

  received_chained_data = [received_data]

  # Receive chained data
  while r_pcb & 0x10 != 0
    ack = 0xA2 | @block_number # Set block number
    received_data = handle_wtx([ack]) # Send ACK to receive next frame

    r_pcb = received_data[0]

    received_chained_data << received_data

    @block_number ^= 1 # toggle block number for next frame
  end

  # Collect INF from chain
  inf = []
  received_chained_data.each do |data|
    flag = data.shift
    data.shift if flag & 0x08 != 0 # CID present
    data.shift if flag & 0x04 != 0 # NAD present

    inf.concat(data)
  end
  inf
end

#picc_transceive(send_data, accept_timeout = false, need_bits = false) ⇒ Object


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# File 'lib/picc.rb', line 29

def picc_transceive(send_data, accept_timeout = false, need_bits = false)
  received_data, valid_bits = @pcd.picc_transceive(send_data, accept_timeout)
  if need_bits
    return received_data, valid_bits
  else
    return received_data
  end
end

#restart_communicationObject


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# File 'lib/picc.rb', line 139

def restart_communication
  picc_was_in_iso_mode = @iso_selected
  iso_deselect if picc_was_in_iso_mode
  unless @pcd.reestablish_picc_communication(@uid)
    halt
    raise CommunicationError, 'Unable to resume communication or wrong card was presented. Halting cards in the field.'
  end
  iso_select if picc_was_in_iso_mode
end