Select Encryption Algorithm with SMTP Encrypted Email

Demonstrates how to select the encryption algorithm and strength (key size) when sending encrypted email.

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[])
  {
    //  The mailman object is used for sending and receiving email.
    CkMailMan mailman = new CkMailMan();

    //  Any string argument automatically begins the 30-day trial.
    boolean success;
    success = mailman.UnlockComponent("30-day trial");
    if (success != true) {
        System.out.println("Component unlock failed");
        return;
    }

    //  Set the SMTP server.
    mailman.put_SmtpHost("smtp.comcast.net");

    //  Create a new email object
    CkEmail email = new CkEmail();

    email.put_Subject("This email is encrypted");
    email.put_Body("This is a digitally encrypted mail");
    email.put_From("Chilkat Support <support@chilkatsoft.com>");
    email.AddTo("Chilkat Admin","admin@chilkatsoft.com");

    //  In this example, we've already installed the certificate for "admin@chilkatsoft.com"
    //  in the current user's personal certificate store.
    //  If the email.SendEncrypted property is set, Chilkat will
    //  automatically search for and use the first non-expired certificate
    //  matching the recipient's email address.  Chilkat searches
    //  the Current User's Personal certificate store, as well
    //  as the Local Machine's Personal certificate store.
    //  Run certmgr.msc to view the certs in the Current User's
    //  certificate store.
    email.put_SendEncrypted(true);

    //  Use the CSP object to select an encryption algorithm:
    CkCSP csp = new CkCSP();
    //  Make sure we're using the enhanced provider, which provides
    //  access to stronger algorithms.
    csp.SetProviderMicrosoftEnhanced();

    //  Select 168-bit 3DES (i.e. 192-bit DES if you include the parity bits)
    csp.SetEncryptAlgorithm("3DES");

    //  Tell the email to use this CSP:
    email.SetCSP(csp);

    success = mailman.SendEmail(email);
    if (success != true) {
        System.out.println(mailman.lastErrorText());
    }
    else {
        //  Examine the LastErrorText anyway, so we can see
        //  that 3DES was used...
        //  You should see these lines in the log:
        //  alg_name: 3DES
        //  alg_bits: 168
        System.out.println(mailman.lastErrorText());
    }


  }
}