Generate DSA SSH Key

Generates a DSA SSH key and saves to various public and private key file formats (OpenSSH and PuTTY).

Download Chilkat Java Library

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[])
  {
    CkSshKey key = new CkSshKey();

    boolean success;

    int numBits;

    //  numBits should be a minimum of 1024 and
    //  a multiple of 64.  Typical values are
    //  1024 or 2048.
    numBits = 2048;
    success = key.GenerateDsaKey(numBits);
    if (success != true) {
        System.out.println("Invalid numBits passed to DSA key generation method.");
        return;
    }

    //  Note: Generating a public/private key pair is CPU intensive
    //  and may take a short amount of time (more than few seconds,
    //  but less than a minute).

    String exportedKey;
    boolean exportEncrypted;

    //  Export the DSA private key to OpenSSH, PuTTY, and XML and save.
    exportEncrypted = false;
    exportedKey = key.toOpenSshPrivateKey(exportEncrypted);
    //  Chilkat provides a SaveText method for convenience...
    success = key.SaveText(exportedKey,"privkey_openssh_unencrypted.pem");

    //  Export with encryption to OpenSSH private key format:
    key.put_Password("secret");
    exportEncrypted = true;
    exportedKey = key.toOpenSshPrivateKey(exportEncrypted);
    success = key.SaveText(exportedKey,"privkey_openssh_encrypted.pem");

    //  Export the DSA private key to unencrypted PuTTY format:
    exportEncrypted = false;
    exportedKey = key.toPuttyPrivateKey(exportEncrypted);
    success = key.SaveText(exportedKey,"privkey_putty_unencrypted.ppk");

    //  Export the DSA private key to encrypted PuTTY format:
    key.put_Password("secret");
    exportEncrypted = true;
    exportedKey = key.toPuttyPrivateKey(exportEncrypted);
    success = key.SaveText(exportedKey,"privkey_putty_encrypted.ppk");

    //  Export private key to XML:
    exportedKey = key.toXml();
    success = key.SaveText(exportedKey,"privkey.xml");

    //  ----------------------------------------------------
    //  Now for the public key....
    //  ----------------------------------------------------

    //  The Secure Shell (SSH) Public Key File Format
    //  is documented in RFC 4716.
    exportedKey = key.toRfc4716PublicKey();
    success = key.SaveText(exportedKey,"pubkey_rfc4716.pub");

    //  OpenSSH has a separate public-key file format, which
    //  is also supported by Chilkat SshKey:
    exportedKey = key.toOpenSshPublicKey();
    success = key.SaveText(exportedKey,"pubkey_openSsh.pub");
  }
}