Xojo Plugin

IMAP Download and Verify Signed (S/MIME) Email

See more IMAP Examples

Demonstrates how to download and verify digitally signed S/MIME email. 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

// We can choose to fetch UIDs or sequence numbers.
Dim fetchUids As Boolean
fetchUids = True

// Get the message IDs of all the emails in the mailbox
Dim messageSet As New Chilkat.MessageSet
success = imap.QueryMbx("ALL",fetchUids,messageSet)
If (success = False) Then
    System.DebugLog(imap.LastErrorText)
    Return
End If

Dim email As New Chilkat.Email
Dim cert As New Chilkat.Cert

Dim i As Int32
i = 0
While i < messageSet.Count

    Dim uid As String
    uid = messageSet.GetId(i)
    System.DebugLog("uid: " + uid)

    success = imap.FetchEmail(False,uid,True,email)
    If (success = False) Then
        System.DebugLog(imap.LastErrorText)
        Return
    End If

    // The security layers of signed and/or encrypted emails
    // are automatically "unwrapped" when loaded into
    // a Chilkat email object.
    // An application only needs to check to see if an email
    // was received signed or encrypted, and then examine
    // the success/failure.  For example:
    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)

            // Get the certificate used for signing.
            success = email.LastSignerCert(0,cert)

            If (success = False) Then
                System.DebugLog("Failed to get signing certificate object.")
            Else
                System.DebugLog("Signing cert: " + cert.SubjectCN)
            End If

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

    End If

    i = i + 1
Wend

// Disconnect from the IMAP server.
success = imap.Disconnect()