(Java) Example: Mime.GetDecryptCertInfo method

Demonstrates the GetDecryptCertInfo method.

Note: This example requires Chilkat v11.4.0 or greater.

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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;

    CkMime mime = new CkMime();

    // Load MIME that is has Content-Type like this:
    // Content-Type: application/pkcs7-mime; smime-type="enveloped-data"; name="smime.p7m"; smime-type="enveloped-data"
    success = mime.LoadMimeFile("qa_data/mime/enveloped_data.eml");
    if (success == false) {
        System.out.println(mime.lastErrorText());
        return;
        }

    // Get information about the certificate that would be needed to decrypt.
    // An enveloped-data can potentially be decrypted by multiple certificates if it was encrypted in a way that allows it,
    // but in most cases, only a single certificate with associated private key (that of the message recipient) is possible.
    CkJsonObject json = new CkJsonObject();
    success = mime.GetDecryptCertInfo(json);
    if (success == false) {
        System.out.println(mime.lastErrorText());
        return;
        }

    json.put_EmitCompact(false);
    System.out.println(json.emit());

    // Sample output:

    // {
    //   "recipientInfo": [
    //     {
    //       "serial": "****",
    //       "issuerCN": "****"
    //     }
    //   ]
    // }

    // Get each certificate's information like this:
    String serial;
    String issuerCN;

    int i = 0;
    int count = json.SizeOfArray("recipientInfo");
    while (i < count) {
        json.put_I(i);
        serial = json.stringOf("recipientInfo[i].serial");
        issuerCN = json.stringOf("recipientInfo[i].issuerCN");
        i = i+1;
        }
  }
}