Swift

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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Swift


func chilkatTest() {
    var success: Bool = false

    let mime = CkoMime()!
    success = mime.loadFile(path: "qa_data/signed.eml")
    if success == false {
        print("\(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 {
        print("\(mime.lastErrorText!)")
        return
    }

    var n: Int = mime.numSignerCerts.intValue
    var i: Int
    for i = 0; i <= n - 1; i++ {
        //  Only signers that included a signing time have one to retrieve.
        if mime.hasSignatureSigningTime(index: i) {
            var signingTime: String? = mime.getSignatureSigningTimeStr(index: i)
            if mime.lastMethodSuccess == false {
                print("\(mime.lastErrorText!)")
                return
            }

            print("Signer \(i) signing time: \(signingTime!)")
        }

    }


}