Java

Set the Decryption Certificate for an Email

Demonstrates the Chilkat Email.SetDecryptCert method, which explicitly provides a certificate (with access to its private key) for decrypting a received encrypted email. Set the certificate before loading the encrypted message so Chilkat can decrypt it automatically. This example loads the certificate from a PFX, sets it, and then loads an encrypted email.

Background: Decrypting S/MIME email requires the recipient's private key. On Windows and macOS, Chilkat can find an installed certificate automatically, but when the key lives in a standalone PFX file you provide it explicitly with SetDecryptCert. A PFX (PKCS#12) bundles the certificate and its private key in one password-protected file. If the certificate and key are in separate files, use SetDecryptCert2 instead.

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Java

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[])
  {
    boolean success = false;

    //  Demonstrates the SetDecryptCert method, which explicitly provides a certificate (with
    //  access to its private key) for decrypting a received encrypted email.  Set the cert
    //  before loading the encrypted email so it can be decrypted automatically.

    CkEmail email = new CkEmail();

    //  Load a certificate together with its private key from a PFX file.
    CkCert cert = new CkCert();
    success = cert.LoadPfxFile("qa_data/certs/decryption.pfx","pfx_password");
    if (success == false) {
        System.out.println(cert.lastErrorText());
        return;
        }

    //  Provide the certificate to use for decryption.
    success = email.SetDecryptCert(cert);
    if (success == false) {
        System.out.println(email.lastErrorText());
        return;
        }

    //  Load the encrypted email; Chilkat decrypts it using the certificate.
    success = email.LoadEml("qa_data/eml/encrypted.eml");
    if (success == false) {
        System.out.println(email.lastErrorText());
        return;
        }

    System.out.println("ReceivedEncrypted = " + email.get_ReceivedEncrypted());
    System.out.println("Decrypted = " + email.get_Decrypted());

    //  Note: Paths such as "qa_data/..." are relative local filesystem paths,
    //  relative to the current working directory of the running application.
  }
}