Compressed public key

[AshleyDDD]

right now, the output of this file only gives out uncompressed 65 bytes (correct me if I am wrong). How would I output the uncompressed key to compressed key?

[dcousens]

What file are you referring to?

If you have an ECPubKey that is uncompressed, call it pub, and you want the compressed form, just take a copy of it and add the compressed flag: new ECPubKey(pub.Q, true).
Then you would just use toBuffer() like you normally would.

Full example:

// Generate a random private key (with an uncompressed public key when serialized)
var priv = ECKey.makeRandom(false)

var cpub = new ECPubKey(priv.pub.Q, true)
console.log(cpub.toHex())

[AshleyDDD]

Ah sorry for that. I am talking to bitcoinjs-min file but I will give what you wrote a try.

[dcousens]

I think it is important to distinguish that ECKey and ECPubKey are Bitcoin level abstractions, not ecdsa.
Therefore if you want to work with the raw public key like this then you should probably do it directly (this API will change in the future, but still):

var priv = ECKey.makeRandom()
var Q = priv.pub

// Print an encoded public key (compressed, uncompressed respectively)
console.log(Q.getEncoded(true))
console.log(Q.getEncoded(false))

edit: Q.getEncoded returns a byte array for now, it'll be a buffer soon enough.