Java

Generate new DSA Key from OpenSSL Parameters File

See more DSA Examples

Generates a new DSA key from an OpenSSL-created parameters file (DER and PEM formats supported). Examples of using OpenSSL to create parameter files are shown here:

openssl dsaparam -outform DER 1024 <  seedData.txt >dsaparam.der

openssl dsaparam 1024 < seedData.txt >dsaparam.pem

Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Dsa;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        Dsa dsa = new Dsa();

        try {
            dsa.genKeyFromParamsDerFile("dsaparam.der");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // To generate a key from PEM, call GenKeyFromParamsPem
        // (for an in-memory PEM string) or GenKeyFromParamsFilePem
        // for a PEM file.

        // The public and private keys may now be exported to PEM, DER,
        // and XML formatted files.

        // First for the public key...
        // The public key never needs to be encrypted.

        // Save the public key in PEM format:
        String pemStr = dsa.toPublicPem();
        // This example will not check the return value of SaveText...
        dsa.saveText(pemStr, "dsa_pub.pem");

        // Save the public key in DER format:
        dsa.toPublicDerFile("dsa_pub.der");

        boolean bPublicOnly = true;
        // Save to XML
        String xmlStr = dsa.toXml(bPublicOnly);
        dsa.saveText(pemStr, "dsa_pub.xml");

        // ------------------------------------
        // Now for the private key....
        // ------------------------------------

        // Unencrypted PEM:
        pemStr = dsa.toPem();
        dsa.saveText(pemStr, "dsa_priv.pem");

        // Encrypted PEM:
        pemStr = dsa.toEncryptedPem("myPassword");
        dsa.saveText(pemStr, "dsa_privEncrypted.pem");

        // DER:
        dsa.toDerFile("dsa_priv.der");

        // XML:
        bPublicOnly = false;
        xmlStr = dsa.toXml(bPublicOnly);
        dsa.saveText(pemStr, "dsa_priv.xml");

        System.out.println("Finished!");
    }
}