Convert PuTTY Private Key (ppk) to OpenSSH (pem)

Convert a PuTTY format private key file (.ppk) to OpenSSH (.pem).

 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;

    //  Load an unencrypted or encrypted PuTTY private key.

    //  If  your PuTTY private key is encrypted, set the Password
    //  property before calling FromPuttyPrivateKey.
    //  If your PuTTY private key is not encrypted, it makes no diffference
    //  if Password is set or not set.
    key.put_Password("secret");

    //  First load the .ppk file into a string:
    String keyStr;
    keyStr = key.loadText("putty_private_key.ppk");

    //  Import into the SSH key object:
    success = key.FromPuttyPrivateKey(keyStr);
    if (success != true) {
        System.out.println(key.lastErrorText());
        return;
    }

    //  Convert to an encrypted or unencrypted OpenSSH key.

    //  First demonstrate converting to an unencrypted OpenSSH key
    String unencryptedKeyStr;
    boolean bEncrypt;
    bEncrypt = false;
    unencryptedKeyStr = key.toOpenSshPrivateKey(bEncrypt);
    success = key.SaveText(unencryptedKeyStr,"unencrypted_openssh.pem");
    if (success != true) {
        System.out.println(key.lastErrorText());
        return;
    }

    //  Save to an encrypted OpenSSH PEM file:
    String encryptedKeyStr;
    bEncrypt = true;
    key.put_Password("myPassword");
    encryptedKeyStr = key.toOpenSshPrivateKey(bEncrypt);
    success = key.SaveText(encryptedKeyStr,"encrypted_openssh.pem");
    if (success != true) {
        System.out.println(key.lastErrorText());
        return;
    }

    System.out.println("Done!");


  }
}