Ruby

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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Ruby

require 'chilkat'

success = false

mime = Chilkat::CkMime.new()
success = mime.LoadMimeFile("qa_data/signed.eml")
if (success == false)
    print mime.lastErrorText() + "\n";
    exit
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.
success = mime.Verify()
if (success != true)
    print mime.lastErrorText() + "\n";
    exit
end

n = mime.get_NumSignerCerts()

for i in 0 .. n - 1
    #  Only signers that included a signing time have one to retrieve.
    if (mime.HasSignatureSigningTime(i))
        signingTime = mime.getSignatureSigningTimeStr(i)
        if (mime.get_LastMethodSuccess() == false)
            print mime.lastErrorText() + "\n";
            exit
        end

        print "Signer " + i.to_s() + " signing time: " + signingTime + "\n";
    end

end