Generate RSA SSH Key

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

 Chilkat Java Library Downloads for Windows, Linux, and MAC OS X

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;
    int exponent;

    //  numBits may range from 384 to 4096.  Typical values are
    //  1024 or 2048.  (must be a multiple of 64)
    //  A good choice for the exponent is 65537.  Chilkat recommends
    //  always using this value.
    numBits = 2048;
    exponent = 65537;
    success = key.GenerateRsaKey(numBits,exponent);
    if (success != true) {
        System.out.println("Bad params passed to RSA 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 RSA 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 RSA private key to unencrypted PuTTY format:
    exportEncrypted = false;
    exportedKey = key.toPuttyPrivateKey(exportEncrypted);
    success = key.SaveText(exportedKey,"privkey_putty_unencrypted.ppk");

    //  Export the RSA 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");

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

  }
}