(Java) Add S/MIME Signature using PFX

Add a digital signature to a MIME message using the certificate + private key from a PFX file.

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[])
  {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkMime mime = new CkMime();

    // Load a PFX file into a certificate object.
    CkCert cert = new CkCert();
    String pfxFilepath = "pfxFiles/something.pfx";
    String pfxPassword = "secret";
    boolean success = cert.LoadPfxFile(pfxFilepath,pfxPassword);
    if (success == false) {
        System.out.println(cert.lastErrorText());
        return;
        }

    success = mime.SetBodyFromPlainText("This is the plain-text MIME body.");

    mime.put_Charset("utf-8");
    mime.put_Encoding("quoted-printable");

    // Sign the MIME (adds a PKCS7 detached signature)
    success = mime.AddDetachedSignature(cert);
    if (success == false) {
        System.out.println(mime.lastErrorText());
        return;
        }

    // Save the S/MIME to a file.
    success = mime.SaveMime("/temp/signedMime.txt");
    if (success == false) {
        System.out.println(mime.lastErrorText());
        return;
        }

    System.out.println("success!");
  }
}