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Check for an S/MIME Signing Time

Demonstrates the Chilkat Mime.HasSignatureSigningTime method, which returns whether the signer at a zero-based index included a CMS signingTime signed attribute. The only argument is the signer index; use NumSignerCerts for the count.

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: A signing time records when the signer claims to have signed, which matters for auditing and for validating a certificate that has since expired. It is an optional signed attribute, so not every signature has one — this predicate lets you check before calling GetSignatureSigningTimeStr, avoiding an error for signers that omitted it. Being a signed attribute, it is covered by the signature and cannot be altered undetected.

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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 verifying, check whether each signer included a CMS signingTime signed attribute.  The
;  only argument is the zero-based signer index.
$bSuccess = $oMime.Verify()
If ($bSuccess <> True) Then
    ConsoleWrite($oMime.LastErrorText & @CRLF)
    Exit
EndIf

Local $iN = $oMime.NumSignerCerts
Local $i
For $i = 0 To $iN - 1
    If ($oMime.HasSignatureSigningTime($i)) Then
        ConsoleWrite("Signer " & $i & " included a signing time." & @CRLF)
    Else
        ConsoleWrite("Signer " & $i & " did not include a signing time." & @CRLF)
    EndIf

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