Java

Export a Private Key as a JWK

Demonstrates the Chilkat PrivateKey.GetJwk method, which exports the key as a compact JWK (JSON Web Key). It takes no arguments; binary values use Base64url without padding.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: JWK is the JSON key format used across modern web security — JWT, OAuth, OpenID Connect. Exporting to it lets you publish a key into a JWK Set or hand it to a web framework that speaks JWK. Note this is the private JWK: it includes the private parameters (d and, for RSA, the CRT values), so it is highly sensitive — publish only the public JWK derived from ToPublicKey when sharing.

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Chilkat2 Java

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

public class ChilkatExample {

    public static void main(String[] args) {
        // Load a private key to export.
        PrivateKey privKey = new PrivateKey();
        String jwk;
        try {
            privKey.loadPemFile("qa_data/private.pem");

            // Export as a compact JWK (JSON Web Key).  Binary values use Base64url without padding.
            jwk = privKey.getJwk();
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println(jwk);
    }
}