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(Java) Verify DKIM-Signature Headers in Downloaded Email

Downloads email from an IMAP server and verifies the DKIM-Signature header(s) in each email, if present.

Chilkat Java Downloads

Java Libs for Windows, Linux, Alpine Linux,
MAC OS X, Solaris, FreeBSD, OpenBSD,
Raspberry Pi and other single board computers

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[])
  {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkImap imap = new CkImap();

    // Connect to an IMAP server, login, select mailbox..
    // Use TLS 
    imap.put_Ssl(true);
    imap.put_Port(993);
    boolean success = imap.Connect("imap.someMailServer.com");
    if (success == true) {
        success = imap.Login("myLogin","myPassword");
        if (success == true) {
            success = imap.SelectMailbox("Inbox");
            }

        }

    if (success != true) {
        System.out.println(imap.lastErrorText());
        return;
        }

    CkDkim dkim = new CkDkim();

    // Download a max of 10 emails and verify any DKIM-Signature headers
    // that are present.

    // Download emails by sequence numbers (not UIDs).
    boolean bUid = false;
    int seqNum;
    int j;
    int n = imap.get_NumMessages();
    if (n > 10) {
        n = 10;
        }

    CkJsonObject json = new CkJsonObject();
    json.put_EmitCompact(false);

    // To verify DKIM-Signature headers, we need the exact unmodified MIME bytes of each email.
    CkBinData mimeData = new CkBinData();
    seqNum = 1;
    while (seqNum <= n) {
        // The FetchSingleBd method was introduced in v9.5.0.76
        success = imap.FetchSingleBd(seqNum,bUid,mimeData);
        if (success != true) {
            System.out.println(imap.lastErrorText());
            return;
            }

        // Get the number of DKIM-Signature headers.
        int numDkim = dkim.NumDkimSigs(mimeData);

        // Verify each..
        j = 0;
        while (j < numDkim) {
            System.out.println("------ DKIM Signature " + j);

            success = dkim.DkimVerify(j,mimeData);
            if (success != true) {
                System.out.println("Not valid.");
                }
            else {
                System.out.println("valid.");
                }

            // Show the additional information about the signature verification
            json.Load(dkim.verifyInfo());
            System.out.println(json.emit());

            // The JSON contains information such as this:

            // 	{
            // 	  "domain": "amazonses.com",
            // 	  "selector": "7v7vs6w47njt4pimodk5mmttbegzsi6n",
            // 	  "publicKey": "MIGfMA0GCSqG...v2GvWPqGHz6uqeQIDAQAB",
            // 	  "canonicalization": "relaxed/simple",
            // 	  "algorithm": "rsa-sha256",
            // 	  "signedHeaders": "Subject:From:To:Date:Mime-Version:Content-Type:References:Message-Id:Feedback-ID",
            // 	  "verified": "yes"
            // 	}

            j = j+1;
            }

        seqNum = seqNum+1;
        }

    success = imap.Disconnect();
  }
}

 

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