Deriving ECDSA Public Key from Private Key

Question

I was attempting to generate a public ECDSA key from a private key, and I haven\'t managed to find much help on the internet as to how to do this. Pretty much everything is

Answer 1

So after a while, I figured out a solution and decided to post it in case anyone else has the same issue as me:

KeyFactory keyFactory = KeyFactory.getInstance("ECDSA", "BC");
    ECParameterSpec ecSpec = ECNamedCurveTable.getParameterSpec("secp256k1");

    ECPoint Q = ecSpec.getG().multiply(((org.bouncycastle.jce.interfaces.ECPrivateKey) this.privateKey).getD());

    ECPublicKeySpec pubSpec = new ECPublicKeySpec(Q, ecSpec);
    PublicKey publicKeyGenerated = keyFactory.generatePublic(pubSpec);
    this.publicKey = publicKeyGenerated;

EDIT: Removed the code decoding the ECPoint as per @MaartenBodewes comment.