Classic ASP

IMAP Download and Verify Signed MIME

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.

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Classic ASP

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<%
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

' Download the 1st email (as MIME) in the Inbox by sequence number.
set sbMime = Server.CreateObject("Chilkat.StringBuilder")
success = imap.FetchSingleAsMimeSb(1,0,sbMime)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( imap.LastErrorText) & "</pre>"
    Response.End
End If

' Load it into a MIME object and check to see if it is signed
set mime = Server.CreateObject("Chilkat.Mime")
success = mime.LoadMimeSb(sbMime)
alreadySavedParts = 0
If (mime.ContainsSignedParts() = 1) Then

    ' This will save the .p7s and other parts...
    set st = Server.CreateObject("Chilkat.StringTable")
    success = mime.PartsToFiles("c:/temp/qa_output",st)
    If (success = 1) Then
        numFiles = st.Count
        i = 0
        Do While i < numFiles
            Response.Write "<pre>" & Server.HTMLEncode( "Created: " & st.StringAt(i)) & "</pre>"
            i = i + 1
        Loop
        alreadySavedParts = 1
    End If

End If

' Load the MIME into an Email object.  This unwraps the security layers and verifies signatures.
set email = Server.CreateObject("Chilkat.Email")
success = email.SetFromMimeSb(sbMime)

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>"

        ' The certificate used for signing may be obtained
        ' by calling email.GetSignedByCert.
        set cert = Server.CreateObject("Chilkat.Cert")
        success = email.LastSignerCert(i,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

    End If

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

If (alreadySavedParts <> 1) Then
    success = email.SaveAllAttachments("c:/temp/qa_output")
End If


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