(Java) Create JWT using a Certificate's Private Key

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Demonstrates how to create a JWT using a certificate's private key.

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

    // Demonstrates how to create a JWT using an certificate's private key.

    CkCert cert = new CkCert();

    // Load an ECC private key from a PEM file.
    boolean success = cert.LoadPfxFile("c:/temp/myPfx.pfx","pfxPassword");
    if (success != true) {
        System.out.println(cert.lastErrorText());
        return;
        }

    CkJwt jwt = new CkJwt();

    // Build the JOSE header
    CkJsonObject jose = new CkJsonObject();
    // Note: The IsEcdsa function was added in Chilkat v10.1.0
    if (cert.IsEcdsa() == true) {
        // Use ES256.  Pass the string "ES384" or "ES512" to use ECC with SHA-384 or SHA-512.
        jose.AppendString("alg","ES256");
        }
    else {
        // Probably RSA...
        // Use RS256.  Pass the string "RS384" or "RS512" to use RSA with SHA-384 or SHA-512.
        jose.AppendString("alg","RS256");
        }

    jose.AppendString("typ","JWT");

    // Now build the JWT claims (also known as the payload)
    CkJsonObject claims = new CkJsonObject();
    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.put_AutoCompact(true);

    // Create the JWT token.
    String token = jwt.createJwtCert(jose.emit(),claims.emit(),cert);

    System.out.println(token);

    // Example output:
    // eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwOi8vZXhhbXBsZS5vcmciLCJzdWIiOiJKb2huIiwiYXVkIjoiaHR0cDovL2V4YW1wbGUuY29tIiwiaWF0IjoxNDg1NzA4NzkyLCJuYmYiOjE0ODU3MDg3OTIsImV4cCI6MTQ4NTcxMjM5Mn0.wqsuyJpxJ073ox-lOiLFqG1lQocXe4hGf2XGZJRrO3qn0UusxI_bu3Gzky8gBsH4sA4u9TWZn5M-1wYMMIJk6Q
  }
}