Java

Check if a MIME Entity is Encrypted (S/MIME)

Demonstrates the Chilkat Mime.IsEncrypted method, which returns whether the entity is a CMS/PKCS #7 encrypted S/MIME wrapper. It takes no arguments.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: This tells you a message is encrypted and must be decrypted before its real content is available — the trigger for supplying a recipient certificate and private key to Decrypt. Reading the body without decrypting first would just yield the opaque PKCS #7 blob.

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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 Mime.IsEncrypted method, which returns whether the entity is a CMS/PKCS #7 encrypted S/MIME wrapper.  It takes no arguments.

    CkMime mime = new CkMime();
    success = mime.LoadMimeFile("qa_data/encrypted.eml");
    if (success == false) {
        System.out.println(mime.lastErrorText());
        return;
        }

    if (mime.IsEncrypted()) {
        System.out.println("This is an encrypted S/MIME message.");
        }
    else {
        System.out.println("This is not an encrypted S/MIME message.");
        }
  }
}