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. Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    // 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"
    // }

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

    // Load from the JWK.
    CkPublicKey pubkey = new CkPublicKey();
    success = pubkey.LoadFromString(json.emit());
    if (success == false) {
        System.out.println(pubkey.lastErrorText());
        return;
        }

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