Java

Create JWT using a Brainpool EC Key

See more JSON Web Token (JWT) Examples

Demonstrates how to create a JWT using an EC private key. This is for JOSE headers having an "alg" member with any of the following values:

• BP160R1
• BP192R1
• BP224R1
• BP256R1
• BP320R1
• BP384R1
• BP512R1

This example also demonstrates how to include time constraints:

• nbf: Not Before Time
• exp: Expiration Time
• iat: Issue At Time

Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.Jwt;
import com.chilkatsoft.chilkat2.PrivateKey;

public class ChilkatExample {

    public static void main(String[] args) {
        // Demonstrates how to create a JWT using a brainpool EC private key.

        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        PrivateKey privKey = new PrivateKey();

        // Load a brainpool EC key.
        try {
            privKey.loadPemFile("c:/qa_data/pem/ec_brainpool_privKey.pem");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // You can examine the curve name of the key you just loaded by getting the private in XML format:
        // <ECCKeyValue curve="CURVE_NAME">...</ECCKeyValue>
        System.out.println(privKey.getXml());

        Jwt jwt = new Jwt();

        // Build the JOSE header
        JsonObject jose = new JsonObject();
        // Use the brainpool curve name matching the private key you just loaded.
        // Use "BP256R1", or "BP384R1", etc.
        jose.appendString("alg", "BP256R1");
        jose.appendString("typ", "JWT");

        // Now build the JWT claims (also known as the payload)
        JsonObject claims = new JsonObject();
        claims.appendString("iss", "http://example.org");
        claims.appendString("sub", "John");
        claims.appendString("aud", "http://example.com");

        // Set the timestamp of when the JWT was created to now.
        int curDateTime = jwt.genNumericDate(0);
        claims.addIntAt(-1, "iat", curDateTime);

        // Set the "not process before" timestamp to now.
        claims.addIntAt(-1, "nbf", curDateTime);

        // Set the timestamp defining an expiration time (end time) for the token
        // to be now + 1 hour (3600 seconds)
        claims.addIntAt(-1, "exp", curDateTime + 3600);

        // Produce the smallest possible JWT:
        jwt.setAutoCompact(true);

        // Create the JWT token.  This is where the ECC signature is created.
        String token = jwt.createJwtPk(jose.emit(), claims.emit(), privKey);

        System.out.println(token);
    }
}