Convert CBOR byte string to JSON

[Whip]

Hi. Thanks for the simple to use library. I'm trying to use this to implement webauthn and getting tripped up at the CBOR decoding part. The webauthn method returns a byte array which has to be CBOR decoded to get a json object. Since I have to send this byte array to the php server I convert it into base64 encoding to send it via ajax.

Once I receive it, in PHP I perform a base64_decode and pass it into the CBOR decoder.

$attestationDecoded = base64_decode($publicKeyCredential['response']['attestationObject']);
$attestationObject = \CBOR\CBOREncoder::decode($attestationDecoded);

This gives me an output like this

Array
(
    [fmt] => none
    [attStmt] => Array
        (
        )

    [authData] => CBOR\Types\CBORByteString Object
        (
            [byte_string:CBOR\Types\CBORByteString:private] => I�
���ht4��dv`[�䮹��2Ǚ\���cE
�X$Jh���%��j���.�a{��g�r,*�~����
        )
)

The authData is where the information I need is. Is there a method to convert the CBORByteString into a json string or php array?