(Java) Generate a CSR with SAN (Subject Alternative Name) Extension

Demonstrates how to generate a private key and a Certificate Signing Request (CSR) that includes the SAN extension.

Note: This example requires Chilkat v9.5.0.84 or greater.

Chilkat Java Downloads Java Libs for Windows, MacOS, Linux, Alpine Linux, Solaris Java Libs for Android

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[])
  {
    // Note: Requires Chilkat v9.5.0.84 or greater.

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

    // First generate an RSA private key.
    // (It is also possible to create CSRs based on ECDSA private keys..)
    CkRsa rsa = new CkRsa();

    // Generate a random 2048-bit RSA key.
    boolean success = rsa.GenerateKey(2048);
    if (success != true) {
        System.out.println(rsa.lastErrorText());
        return;
        }

    // Get the private key
    CkPrivateKey privKey = rsa.ExportPrivateKeyObj();

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

    // Specify the Common Name. 
    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");

    // Add Subject Alternative Names
    // (The AddSan method is added in Chilkat v9.5.0.84)
    // Call AddSan for each alternative name.
    success = csr.AddSan("dnsName","mydomain.com");
    success = csr.AddSan("dnsName","mysubdomain.mydomain.com");
    success = csr.AddSan("ipAddress","192.168.0.123");

    // Create the CSR using the private key.
    String pemStr = csr.genCsrPem(privKey);
    if (csr.get_LastMethodSuccess() != true) {
        System.out.println(csr.lastErrorText());

        return;
        }

    // Save the private key and CSR to a files.
    privKey.SavePkcs8EncryptedPemFile("password","qa_output/privKey1.pem");

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

    // Show the CSR.
    System.out.println(pemStr);

    // Sample output:

    // 	-----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-----
  }
}