Ensures that :SSLCertificate and :SSLPrivateKey have been provided or that a new certificate is generated with the other parameters provided.
Verifies that data matches the signature created by public_key and the digest algorithm.
Update RubyGems software to the latest version.
Copied from ExtConfBuilder
Updates the TarHeader’s checksum
Does this dependency request match spec?
NOTE: matches_spec? matches prerelease versions. See also match?
Returns true if this gem is installable for the current platform.