S/MIME Signed Message

Create an S/MIME signed (PKCS7) message.

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[])
  {
    CkMime mime = new CkMime();

    boolean success;
    success = mime.UnlockComponent("Anything for 30-day trial.");
    if (success == false) {
        System.out.println(mime.lastErrorText());
        return;
    }

    mime.AddHeaderField("Subject","This is a test");
    mime.AddHeaderField("Abc","123");

    mime.SetBodyFromPlainText("This is the body");

    CkCert cert = new CkCert();
    //  Load a certificate that has already been installed (from a .pfx)
    //  on the computer:
    success = cert.LoadByEmailAddress("thawte@chilkatsoft.com");
    if (success == false) {
        System.out.println(cert.lastErrorText());
        return;
    }

    //  Convert to a signed message.
    success = mime.ConvertToSigned(cert);
    if (success == false) {
        System.out.println(mime.lastErrorText());
        return;
    }

    //  Display the signed MIME:
    System.out.println(mime.getMime());

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

    //  Unwrap to restore the original MIME.
    success = mime.UnwrapSecurity();
    if (success == false) {
        System.out.println(mime.lastErrorText());
        return;
    }

    //  Display the restored (unsigned) MIME:
    System.out.println(mime.getMime());

  }
}