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Get the S/MIME Signer's Certificate

Demonstrates the Chilkat Mime.LastSignerCert method, which loads the signer certificate at a zero-based index from the most recent successful verification (or security-unwrapping) into a Cert. The first argument is the signer index and the second is the receiving Cert.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: Verifying tells you the signature is mathematically valid, but you usually also need to know who signed — the subject, the issuer, the validity dates — to decide whether to trust it. This retrieves each signer's certificate after verification so your code can inspect and apply its own trust rules. A message can have multiple signers, so iterate from 0 to NumSignerCerts - 1.

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Local $bSuccess = False

$oMime = ObjCreate("Chilkat.Mime")
$bSuccess = $oMime.LoadMimeFile("qa_data/signed.eml")
If ($bSuccess = False) Then
    ConsoleWrite($oMime.LastErrorText & @CRLF)
    Exit
EndIf

;  After a successful verification, load each signer's certificate to inspect it.  The 1st argument
;  is the zero-based signer index and the 2nd is a Cert object that receives the certificate.
$bSuccess = $oMime.Verify()
If ($bSuccess <> True) Then
    ConsoleWrite($oMime.LastErrorText & @CRLF)
    Exit
EndIf

Local $iN = $oMime.NumSignerCerts
$oCert = ObjCreate("Chilkat.Cert")
Local $i
For $i = 0 To $iN - 1
    $bSuccess = $oMime.LastSignerCert($i,$oCert)
    If ($bSuccess = False) Then
        ConsoleWrite($oMime.LastErrorText & @CRLF)
        Exit
    EndIf

    ConsoleWrite("Signer " & $i & ": " & $oCert.SubjectCN & " (issued by " & $oCert.IssuerCN & ")" & @CRLF)
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