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keycard.status.im-old/source/api/apdu_getstatus.md

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apdu_getstatus Protocol

GET STATUS

  • CLA = 0x80
  • INS = 0xF2
  • P1 = 0x00 for application status, 0x01 for key path status
  • P2 = 0x00
  • Response SW = 0x9000 on success, 0x6A86 on undefined P1
  • Response Data = Application Status Template or Key Path
  • Preconditions: Secure Channel must be opened

Response Data format: if P1 = 0x00:

  • Tag 0xA3 = Application Status Template
    • Tag 0x02 = PIN retry count (1 byte)
    • Tag 0x02 = PUK retry count (1 byte)
    • Tag 0x01 = 0xff if key is initialized, 0 otherwise

This must be implemented even if Credential and/or Key management is not implemented. If the PIN/PUK retry count is not available or is not applicable, its value should be set to 0xff.

if P1 = 0x01:

  • a sequence of 32-bit numbers indicating the current key path. Empty if master key is selected.