Java

Load EC Public Key from X,Y Values

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Demonstrates how to load an EC public key from X and Y values. Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.PublicKey;

public class ChilkatExample {

    public static void main(String[] args) {
        // We have the following x and y values in base64 (for an EC point on the P-256 curve).
        String x = "Dn7uB1O7kgk74G6qfQwFJESeDnxO6lLjGZFWZJE16tw";
        String y = "iOWA5DInzK6nuUGvHJbMVq1Dpj248FqSV2teN3HzmhU";

        // Build a JWK that looks like this:

        // {
        //   "kty": "EC",
        //   "crv": "P-256",
        //   "x": "Dn7uB1O7kgk74G6qfQwFJESeDnxO6lLjGZFWZJE16tw",
        //   "y": "iOWA5DInzK6nuUGvHJbMVq1Dpj248FqSV2teN3HzmhU"
        // }

        JsonObject json = new JsonObject();
        json.updateString("kty", "EC");
        json.updateString("crv", "P-256");
        json.updateString("x", x);
        json.updateString("y", y);

        // Load from the JWK.
        PublicKey pubkey = new PublicKey();
        try {
            pubkey.loadFromString(json.emit());
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("Success.");
    }
}