# File lib/rubygems/validator.rb, line 23
    def verify_gem(gem_data)
      raise VerificationError, 'empty gem file' if gem_data.size == 0

      unless gem_data =~ /MD5SUM/ then
        return # Don't worry about it...this sucks.  Need to fix MD5 stuff for
               # new format
               # FIXME
      end

      sum_data = gem_data.gsub(/MD5SUM = "([a-z0-9]+)"/,
                               "MD5SUM = \"#{"F" * 32}\"")

      unless Gem::MD5.hexdigest(sum_data) == $1.to_s then
        raise VerificationError, 'invalid checksum for gem file'
      end
    end