Xojo Plugin

IMAP Download and Verify Signed MIME

See more IMAP Examples

Downloads the original MIME of a digitally signed email and saves the .p7s signature along with other MIME parts. It then imports the email into a Chilkat email object to unwrap the S/MIME and verify the signature, and subsequently saves the attachments if they haven't been saved already. Xojo Plugin

Dim success As Boolean
success = False

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

Dim imap As New Chilkat.Imap

// Connect to an IMAP server.
// Use TLS
imap.Ssl = True
imap.Port = 993
success = imap.Connect("imap.example.com")
If (success = False) Then
    System.DebugLog(imap.LastErrorText)
    Return
End If

success = imap.Login("myLogin","myPassword")
If (success = False) Then
    System.DebugLog(imap.LastErrorText)
    Return
End If

// Select an IMAP mailbox
success = imap.SelectMailbox("Inbox")
If (success = False) Then
    System.DebugLog(imap.LastErrorText)
    Return
End If

// Download the 1st email (as MIME) in the Inbox by sequence number.
Dim sbMime As New Chilkat.StringBuilder
success = imap.FetchSingleAsMimeSb(1,False,sbMime)
If (success = False) Then
    System.DebugLog(imap.LastErrorText)
    Return
End If

// Load it into a MIME object and check to see if it is signed
Dim mime As New Chilkat.Mime
success = mime.LoadMimeSb(sbMime)
Dim alreadySavedParts As Boolean
alreadySavedParts = False
If (mime.ContainsSignedParts() = True) Then

    // This will save the .p7s and other parts...
    Dim st As New Chilkat.StringTable
    success = mime.PartsToFiles("c:/temp/qa_output",st)
    If (success = True) Then
        Dim numFiles As Int32
        numFiles = st.Count
        Dim i As Int32
        i = 0
        While i < numFiles
            System.DebugLog("Created: " + st.StringAt(i))
            i = i + 1
        Wend
        alreadySavedParts = True
    End If

End If

// Load the MIME into an Email object.  This unwraps the security layers and verifies signatures.
Dim email As New Chilkat.Email
success = email.SetFromMimeSb(sbMime)

If (email.ReceivedSigned = True) Then

    System.DebugLog("This email was signed.")

    // Check to see if the signatures were verified.
    If (email.SignaturesValid = True) Then
        System.DebugLog("Digital signature(s) verified.")

        System.DebugLog("Signer: " + email.SignedBy)

        // The certificate used for signing may be obtained
        // by calling email.GetSignedByCert.
        Dim cert As New Chilkat.Cert
        success = email.LastSignerCert(i,cert)
        If (success = False) Then
            System.DebugLog("Failed to get signing certificate object.")
        Else
            System.DebugLog("Signing cert: " + cert.SubjectCN)
        End If

    End If

Else
    System.DebugLog("Digital signature verification failed.")
End If

If (alreadySavedParts <> True) Then
    success = email.SaveAllAttachments("c:/temp/qa_output")
End If