Android™

Generate CSR from Pre-Existing Private Key

See more CSR Examples

Demonstrates how to generate a Certificate Signing Request (CSR) from a pre-existing RSA private key.

Note: This example requires Chilkat v9.5.0.65 or greater.

Android™

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

    //  Note: Requires Chilkat v9.5.0.65 or greater.

    //  This requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    CkPrivateKey privKey = new CkPrivateKey();

    //  Load the private key from a file.
    //  (Chilkat provides the ability to load private keys from many different
    //  formats and sources..)
    success = privKey.LoadEncryptedPemFile("qa_data/rsa/privKey1.pem","password");
    if (!success) {
        Log.i(TAG, privKey.lastErrorText());
        return;
        }

    //  Create the CSR object and set properties.
    CkCsr csr = new CkCsr();

    //  Specify the Common Name.  This is the only required property.
    //  For SSL/TLS certificates, this would be the domain name. 
    //  For email certificates this would be the email address. 
    csr.put_CommonName("mysubdomain.mydomain.com");

    //  Country Name (2 letter code)
    csr.put_Country("GB");

    //  State or Province Name (full name)
    csr.put_State("Yorks");

    //  Locality Name (eg, city)
    csr.put_Locality("York");

    //  Organization Name (eg, company)
    csr.put_Company("Internet Widgits Pty Ltd");

    //  Organizational Unit Name (eg, secion/division)
    csr.put_CompanyDivision("IT");

    //  Email address
    csr.put_EmailAddress("support@mydomain.com");

    //  Create the CSR using the private key.
    String pemStr = csr.genCsrPem(privKey);
    if (csr.get_LastMethodSuccess() != true) {
        Log.i(TAG, csr.lastErrorText());
        return;
        }

    //  Save the CSR..
    CkFileAccess fac = new CkFileAccess();
    fac.WriteEntireTextFile("qa_output/csr1.pem",pemStr,"utf-8",false);

    //  Show the CSR.
    Log.i(TAG, pemStr);

    //  Sample output:
    //  The CSR PEM can be checked here:
    //  https://www.networking4all.com/en/support/tools/csr+check/
    //  Copy-and-paste the PEM into the online CSR Decoding / CSR Verification form

    //  	-----BEGIN CERTIFICATE REQUEST-----
    //  	MIIC6jCCAdICAQAwgaQxITAfBgNVBAMMGG15c3ViZG9tYWluLm15ZG9tYWluLmNv
    //  	bTELMAkGA1UEBhMCR0IxDjAMBgNVBAgMBVlvcmtzMQ0wCwYDVQQHDARZb3JrMSEw
    //  	HwYDVQQKDBhJbnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQxCzAJBgNVBAsMAklUMSMw
    //  	IQYJKoZIhvcNAQkBFhRzdXBwb3J0QG15ZG9tYWluLmNvbTCCASIwDQYJKoZIhvcN
    //  	AQEBBQADggEPADCCAQoCggEBALnQ0un/wF8whk+gPuiAlf3qvx14jgAOV6Erm6EB
    //  	H7WACPCpnKcm/8KP+7uoPiwRQaENhMeCgf45vcivl2p6aAn/spLXyEkXyw2d8wFb
    //  	YYAGRkiz4Xf7ASJiKuwcOtORz+sSDzgtdfokHfXU1cYeFE2yQhSdLUY5fMn425+g
    //  	KoEEsRSjSDe6AKru4+4iGNrLKd8pB9IA5/jOE139IkWlB9r5fEPD5bUTsgqXk9eb
    //  	68O0gc712V2eZK07N24lDmFC4bIMTD4csDWocR5hFHXj7NX7c8sOBDcpEb9mPIk4
    //  	elxubnhkfnjhOi4J3lDHcT/0ALnbLhf9LnaiKqs+5VcVZvECAwEAAaAAMA0GCSqG
    //  	SIb3DQEBBQUAA4IBAQC0AETLIcP3foh5nbu2hVFS8uCUNZ5hEIR1eXmYZmZoBQq2
    //  	26ZAoT4CZwixlggC+n7WvAXJ5Pzxpl4wLV4loTiQzaKPX1w0ERo5ZRwLy0n56oG2
    //  	6QG+WTViT1C8rlgtVwkCFNOXr0kSSRs8FdaPllqKxK1hxYSL7zwNpumsk39F2cDt
    //  	vhcekvH0V3BuGrQFm3dKN/0azW6GOod9+Vq4VzSyOe3kp15oxLBsZOFOu/REujcw
    //  	Tzu2jt1asQKUm60CZ9wNHpYepR0Ww40uP1slbehEaFDa6V8b60/tlHHmBbJ4/fy5
    //  	hJnYCvjzFz4O9VtT+JtP9ldRHWV3KpZ8ne3AjD+F
    //  	-----END CERTIFICATE REQUEST-----

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}