Add S/MIME Signature using PFX

Add a digital signature to a MIME message using the certificate + private key from a PFX file.

Download Chilkat MIME ActiveX

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
Set outFile = fso.CreateTextFile("output.txt", True)

set mime = CreateObject("Chilkat.Mime")

success = mime.UnlockComponent("Anything for 30-day trial")
If (success = 0) Then
    outFile.WriteLine(mime.LastErrorText)
    WScript.Quit
End If

'  Load a PFX file into a certificate object.
set cert = CreateObject("Chilkat.Cert")
pfxFilepath = "pfxFiles/something.pfx"
pfxPassword = "secret"
success = cert.LoadPfxFile(pfxFilepath,pfxPassword)
If (success = 0) Then
    outFile.WriteLine(cert.LastErrorText)
    WScript.Quit
End If

mime.SetBodyFromPlainText "This is the plain-text MIME body."

mime.Charset = "utf-8"
mime.Encoding = "quoted-printable"

'  Sign the MIME:
success = mime.AddDetachedSignature(cert)
If (success = 0) Then
    outFile.WriteLine(mime.LastErrorText)
    WScript.Quit
End If

'  Save the S/MIME to a file.
success = mime.SaveMime("c:/temp/signedMime.txt")
If (success = 0) Then
    outFile.WriteLine(mime.LastErrorText)
    WScript.Quit
End If

MsgBox "success!"

outFile.Close