PKCS7 Encrypt using Multiple Certificates

Encrypts MIME using multiple digital certificates. Calls AddEncryptCert once per certificate, followed by a call to EncryptN. The MIME may be decrypted by any owner of one of the certificates + its associated private key.

 Chilkat Java Library Downloads for Windows, Linux, and MAC OS X

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;
    }

    //  Build a simple MIME message to be encrypted:
    mime.AddHeaderField("Content-Type","text/plain");
    mime.AddHeaderField("abc","123");
    mime.SetBody("This is a test");

    //  A digital certificate is required to create PKCS7 encrypted MIME.
    //  It can come from a variety of sources: .cer file, .pfx file, PEM files,
    //  an in-memory representation, or directly from a Windows
    //  registry-based certificate store.

    //  Load one cert from a .cer file:
    CkCert cert1 = new CkCert();
    success = cert1.LoadFromFile("myCert.cer");
    if (success == false) {
        System.out.println(cert1.lastErrorText());
        return;
    }

    //  Load another cert from the Windows registry store:
    CkCert cert2 = new CkCert();
    success = cert2.LoadByCommonName("Chilkat Sales");
    if (success == false) {
        System.out.println(cert2.lastErrorText());
        return;
    }

    //  Tell the MIME object to use these certs for encrypting:
    //  (AddEncryptCert shouldn't fail if we already know it contains
    //  a valid certificate..)
    success = mime.AddEncryptCert(cert1);
    success = mime.AddEncryptCert(cert2);

    //  Encrypt the MIME:
    success = mime.EncryptN();
    if (success == false) {
        System.out.println(mime.lastErrorText());
        return;
    }

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

    //  The resulting S/MIME looks something like this:
    //  
abc: 123
Content-Disposition: attachment; filename="smime.p7m"
Content-Transfer-Encoding: base64
Content-Type: application/x-pkcs7-mime;
 name="smime.p7m"

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  }
}