Java

Save a Private Key as a PKCS #8 DER File

Demonstrates the Chilkat PrivateKey.SavePkcs8File method, which saves the key as unencrypted PKCS #8 DER to a file. The only argument is the destination path.

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: The file-writing counterpart to GetPkcs8ENC/GetPkcs8Pem, producing a compact binary .der in the algorithm-independent PKCS #8 container. Because it is unencrypted, the file itself is the only protection for the key — store it with restrictive permissions, or use SavePkcs8EncryptedFile to add a passphrase.

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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();
        try {
            privKey.loadPemFile("qa_data/private.pem");

            // Save as unencrypted PKCS #8 DER.
            privKey.savePkcs8File("qa_output/private_pkcs8.der");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

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