# File lib/mime/types.rb, line 298
298:     def signature?
299:       case @content_type.downcase
300:         when "application/pgp-keys",
301:              "application/pgp",
302:              "application/pgp-signature",
303:              "application/pkcs10",
304:              "application/pkcs7-mime",
305:              "application/pkcs7-signature",
306:              "text/vcard"
307:           true
308:       end
309:     end