ruby class for openssh keys checking.

gistfile1.rb

class OpenSSHKey

  def self.valid? key
    string=key.to_s
    oneliner =  string.lines.count>1 ? to_openssh(string) : string

    tmpfile="/tmp/openssh-check-#{rand(1000000).to_i}"
    File.open(tmpfile, "w") { |file|  file.puts oneliner}
    begin
      system "ssh-keygen -l -f '#{tmpfile}' >/dev/null 2>/dev/null"
    ensure
      File.unlink tmpfile  
    end
  end

  def self.to_openssh key
    string=key.to_s
    return string if string.lines.count==1

    tmpfile="/tmp/openssh-check-#{rand(1000000).to_i}"
    File.open(tmpfile, "w") { |file|  file.puts string}
    result=`ssh-keygen -i -f '#{tmpfile}' 2>/dev/null`
    begin
      $?.exitstatus==0 ?
        result
        :
        nil
    ensure
      File.unlink tmpfile
    end
  end
end