Java

Export a Private Key as DER into a BinData

Demonstrates the Chilkat PrivateKey.GetPkcsBd method, which exports the key as DER into a BinData. The first argument selects PKCS #1 (true) versus PKCS #8 (false), the second is the password (empty for unencrypted), and the third is the BinData that receives the bytes.

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: This is the in-memory binary export — the raw DER bytes land in a BinData ready to hash, encrypt, or hand to another API without a temporary file. One method covers several cases: the boolean picks the traditional (PKCS #1) versus modern (PKCS #8) structure, and a nonempty password produces an encrypted PKCS #8 export (with the cipher from Pkcs8EncryptAlg). Source any password securely.

Chilkat Java Downloads

Download Chilkat for Java

Chilkat2 Java

import com.chilkatsoft.chilkat2.BinData;
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");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // The key password is not hard-coded in a real application; obtain it from an interactive
        // prompt, environment variable, or a secrets vault.
        String password = "myKeyPassword";

        // Export the key as DER into a BinData.  The 1st argument selects PKCS #1 (true) versus PKCS #8
        // (false); the 2nd is the password (empty string for an unencrypted export); the 3rd is the
        // BinData that receives the DER bytes.
        boolean usePkcs1 = false;
        BinData bd = new BinData();
        try {
            privKey.getPkcsBd(usePkcs1, password, bd);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("Exported " + bd.getNumBytes() + " DER bytes.");
    }
}