(Java) Load .eml and Decrypt (smime.p7m)

Loads an encrypted email from a .eml file and decrypts using certificate w/ private key found in a .p12 (or .pfx) file.

The Content-Type and Content-Disposition email headers of the email to be decrypted look similar to this:

Content-Type: application/x-pkcs7-mime; smime-type=enveloped-data;
	name="smime.p7m"
Content-Disposition: attachment; filename="smime.p7m"

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[])
  {
    CkEmail email = new CkEmail();

    boolean success;

    // Add a PFX (or .p12) to be used for decryption
    success = email.AddPfxSourceFile("myCert.p12","passwordForP12");
    if (success != true) {
        System.out.println(email.lastErrorText());
        return;
        }

    // Loading the .eml automatically decrypts.
    success = email.LoadEml("encrypted.eml");
    if (success != true) {
        System.out.println(email.lastErrorText());
        return;
        }

    // The email now exists as it was prior to encryption.
    // Your app may access the email's subject, body, attachments,
    // etc. using the Chilkat Email API...

    // Save the decrypted email:
    success = email.SaveEml("decrypted.eml");
    if (success != true) {
        System.out.println(email.lastErrorText());
        return;
        }

    System.out.println("Success.");
  }
}