Get an assertion

Command APDU info

CLA	INS	P1	P2	Lc	Data	Le
00	10	00	00	data length	02 encoded info	(absent)

The Ins byte (instruction) is 10, which is the byte for CTAPHID_CBOR. That means the command information is in a CBOR encoded structure in the Data.

The data consists of the CTAP Command Byte and the CBOR encoding of the command's parameters. In this case, the CTAP Command Byte is 02, which is the command "authenticatorGetAssertion". The CBOR encoding is described in the documentation for GetAssertionParameters.

Response APDU info

Response APDU for a successful get

Total Length: variable + 2
Data Length: variable

Data	SW1	SW2
encoded info	90	00

The info returned is CBOR encoded. It has a structure similar to the following.

  A5
     01 --map--
     02 --byte string--
     03 --byte string--
     04 --map--
     05 --int--
     06 --boolean--
     07 --byte string--