VBScript

POP3 Verify Signed (S/MIME) Email

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

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

success = 0

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

set mailman = CreateObject("Chilkat.MailMan")

' Set the POP3 server's hostname
mailman.MailHost = "pop.example.com"

' Set the POP3 login/password.
mailman.PopUsername = "myLogin"
mailman.PopPassword = "myPassword"

set stUidls = CreateObject("Chilkat.StringTable")
success = mailman.FetchUidls(stUidls)
If (success = 0) Then
    outFile.WriteLine(mailman.LastErrorText)
    WScript.Quit
End If

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

count = stUidls.Count
i = 0
Do While i < count
    ' Download the full email.
    success = mailman.FetchByUidl(stUidls.StringAt(i),0,0,email)
    If (success = 0) Then
        outFile.WriteLine(mailman.LastErrorText)
        WScript.Quit
    End If

    outFile.WriteLine(i)
    outFile.WriteLine("From: " & email.From)
    outFile.WriteLine("Subject: " & email.Subject)

    ' 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

        outFile.WriteLine("This email was signed.")

        ' Check to see if the signatures were verified.
        If (email.SignaturesValid = 1) Then
            outFile.WriteLine("Digital signature(s) verified.")
            outFile.WriteLine("Signer: " & email.SignedBy)

            success = email.LastSignerCert(0,cert)
            If (success = 0) Then
                outFile.WriteLine(email.LastErrorText)
                WScript.Quit
            End If

            outFile.WriteLine("Signing cert: " & cert.SubjectCN)
        End If

    Else
        outFile.WriteLine("Digital signature verification failed.")
    End If

    i = i + 1
Loop

success = mailman.Pop3EndSession()

outFile.Close