Node.js

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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Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    var mime = new chilkat.Mime();
    success = mime.LoadMimeFile("qa_data/signed.eml");
    if (success == false) {
        console.log(mime.LastErrorText);
        return;
    }

    //  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.
    success = mime.Verify();
    if (success !== true) {
        console.log(mime.LastErrorText);
        return;
    }

    var n = mime.NumSignerCerts;
    var i;
    for (i = 0; i <= n - 1; i++) {
        //  Only signers that included a signing time have one to retrieve.
        if (mime.HasSignatureSigningTime(i)) {
            var signingTime = mime.GetSignatureSigningTimeStr(i);
            if (mime.LastMethodSuccess == false) {
                console.log(mime.LastErrorText);
                return;
            }

            console.log("Signer " + i + " signing time: " + signingTime);
        }

    }


}

chilkatExample();