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Get an S/MIME Signing Time

Demonstrates the Chilkat Mime.GetSignatureSigningTimeStr method, which returns the CMS signingTime attribute for the signer at a zero-based index, as an RFC 822-style date string in GMT. The only argument is the signer index.

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: This is the timestamp the signer asserted at signing — useful for "when was this signed" audit trails and for evaluating whether the signing certificate was valid at that moment. Because it is a signed attribute, it is tamper-evident. Guard the call with HasSignatureSigningTime, since the attribute is optional. Note it is the signer's claim, not a trusted third-party timestamp.

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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, get the CMS signingTime for each signer that has one, as an RFC 822 date string
;  in GMT.  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 $iN - 1
    ;  Only signers that included a signing time have one to retrieve.
    If ($oMime.HasSignatureSigningTime($i)) Then
Local $signingTime = $oMime.GetSignatureSigningTimeStr($i)
        If ($oMime.LastMethodSuccess = False) Then
            ConsoleWrite($oMime.LastErrorText & @CRLF)
            Exit
        EndIf

        ConsoleWrite("Signer " & $i & " signing time: " & $signingTime & @CRLF)
    EndIf

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