DataFlex

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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DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoMime
    Integer n
    Integer i
    String sSigningTime
    String sTemp1
    Boolean bTemp1

    Move False To iSuccess

    Get Create (RefClass(cComChilkatMime)) To hoMime
    If (Not(IsComObjectCreated(hoMime))) Begin
        Send CreateComObject of hoMime
    End
    Get ComLoadMimeFile Of hoMime "qa_data/signed.eml" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoMime To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  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.
    Get ComVerify Of hoMime To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoMime To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComNumSignerCerts Of hoMime To n

    For i From 0 To (n - 1)
        //  Only signers that included a signing time have one to retrieve.
        Get ComHasSignatureSigningTime Of hoMime i To bTemp1
        If (bTemp1) Begin
            Get ComGetSignatureSigningTimeStr Of hoMime i To sSigningTime
            Get ComLastMethodSuccess Of hoMime To bTemp1
            If (bTemp1 = False) Begin
                Get ComLastErrorText Of hoMime To sTemp1
                Showln sTemp1
                Procedure_Return
            End

            Showln "Signer " i " signing time: " sSigningTime
        End

    Loop



End_Procedure