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What is the (uncompressed) x,y-representation of a curve point on the P-256 NIST elliptic curve?

I am trying to understand the FIDO U2F Raw Message Format, especially the format in which a user public key should be provided.

The documentation says the following:

A user public key [65 bytes]. This is the (uncompressed) x,y-representation of a curve point on the P-256 NIST elliptic curve.

I have parsed the following provided key pair in HEX format with the jsrsasign JavaScript library:

// p. 19. l. 340-341
var PUBLIC_KEY = '04b174bc49c7ca254b70d2e5c207cee9cf174820ebd77ea3c65508c26da51b657c1cc6b952f8621697936482da0a6d3d3826a59095daf6cd7c03e2e60385d2f6d9';

// p. 19 l. 338
var PRIVATE_KEY = '9a9684b127c5e3a706d618c86401c7cf6fd827fd0bc18d24b0eb842e36d16df1';

This gives me access to (hopefully) all relevant data for this keypair:

- ecparams
    - G:ECPointFp
        - curve:ECCurveFp
            - a:ECFieldElementFp
                - q:BigInteger
                - x:BigInteger
            - b:ECFieldElementFp
                - q:BigInteger
                - x:BigInteger
            - q:BigInteger
        - x:ECFieldElementFp
            - q:BigInteger
            - x:BigInteger
        - y:ECFieldElementFp
            - q:BigInteger
            - x:BigInteger
        - z:BigInteger
    - curve:ECCurveFp
        - a:ECFieldElementFp
            - q:BigInteger
            - x:BigInteger
        - b:ECFieldElementFp
            - q:BigInteger
            - x:BigInteger
        - q:BigInteger
    - h:BigInteger

However, I am completely lost trying to construct a message of 65 bytes from this information.

hddn

#hddn #TheSupremeTeam Artist Name: hddn Who are you? I try to experiment with a lot of field recording and synth filters catching new frequencies to give my music more atmosphere Where are you from? I'm from Italy but i travel quit a lot. I'm trying to get in the ambient music because i'm under influence::Listen

#hddn #TheSupremeTeam
Artist Name: hddn

Who are you?

I try to experiment with a lot of field recording and synth filters catching new frequencies to give my music more atmosphere

Where are you from?

I'm from Italy but i travel quit a lot. I'm trying to get in the ambient music because i'm under influence of Gas, Brian Eno and The Field

How can we follow you?

Song Title: More

Listen to hddn:

Source: https://supremepr.us/

What is the (uncompressed) x,y-representation of a curve point on the P-256 NIST elliptic curve?

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