Ruby

Check for an S/MIME Signing Time

Demonstrates the Chilkat Mime.HasSignatureSigningTime method, which returns whether the signer at a zero-based index included a CMS signingTime signed attribute. The only argument is the signer index; use NumSignerCerts for the count.

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: A signing time records when the signer claims to have signed, which matters for auditing and for validating a certificate that has since expired. It is an optional signed attribute, so not every signature has one — this predicate lets you check before calling GetSignatureSigningTimeStr, avoiding an error for signers that omitted it. Being a signed attribute, it is covered by the signature and cannot be altered undetected.

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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, check whether each signer included a CMS signingTime signed attribute.  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
    if (mime.HasSignatureSigningTime(i))
        print "Signer " + i.to_s() + " included a signing time." + "\n";
    else
        print "Signer " + i.to_s() + " did not include a signing time." + "\n";
    end

end