(Classic ASP) IMAP Download and Verify Signed (S/MIME) Email

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

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

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

set imap = Server.CreateObject("Chilkat.Imap")

' Connect to an IMAP server.
' Use TLS
imap.Ssl = 1
imap.Port = 993
success = imap.Connect("imap.example.com")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( imap.LastErrorText) & "</pre>"
    Response.End
End If

success = imap.Login("myLogin","myPassword")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( imap.LastErrorText) & "</pre>"
    Response.End
End If

' Select an IMAP mailbox
success = imap.SelectMailbox("Inbox")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( imap.LastErrorText) & "</pre>"
    Response.End
End If

' We can choose to fetch UIDs or sequence numbers.
fetchUids = 1

' Get the message IDs of all the emails in the mailbox
set messageSet = Server.CreateObject("Chilkat.MessageSet")
success = imap.QueryMbx("ALL",fetchUids,messageSet)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( imap.LastErrorText) & "</pre>"
    Response.End
End If

set email = Server.CreateObject("Chilkat.Email")
set cert = Server.CreateObject("Chilkat.Cert")

i = 0
Do While i < messageSet.Count

    uid = messageSet.GetId(i)
    Response.Write "<pre>" & Server.HTMLEncode( "uid: " & uid) & "</pre>"

    success = imap.FetchEmail(0,uid,1,email)
    If (success = 0) Then
        Response.Write "<pre>" & Server.HTMLEncode( imap.LastErrorText) & "</pre>"
        Response.End
    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 = 1) Then

        Response.Write "<pre>" & Server.HTMLEncode( "This email was signed.") & "</pre>"

        ' Check to see if the signatures were verified.
        If (email.SignaturesValid = 1) Then
            Response.Write "<pre>" & Server.HTMLEncode( "Digital signature(s) verified.") & "</pre>"
            Response.Write "<pre>" & Server.HTMLEncode( "Signer: " & email.SignedBy) & "</pre>"

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

            If (success = 0) Then
                Response.Write "<pre>" & Server.HTMLEncode( "Failed to get signing certificate object.") & "</pre>"
            Else
                Response.Write "<pre>" & Server.HTMLEncode( "Signing cert: " & cert.SubjectCN) & "</pre>"
            End If

        Else
            Response.Write "<pre>" & Server.HTMLEncode( "Digital signature verification failed.") & "</pre>"
        End If

    End If

    i = i + 1
Loop

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

%>
</body>
</html>