class Net::SSH::Authentication::Agent

def identities

to the comment returned by the agent for that key.
Each key returned is augmented with a +comment+ property which is set
Return an array of all identities (public keys) known to the agent. 
def identities
  type, body = send_and_wait(SSH2_AGENT_REQUEST_IDENTITIES)
  raise AgentError, "could not get identity count" if agent_failed(type)
  raise AgentError, "bad authentication reply: #{type}" if type != SSH2_AGENT_IDENTITIES_ANSWER
  identities = []
  body.read_long.times do
    key_str = body.read_string
    comment_str = body.read_string
    begin
      key = Buffer.new(key_str).read_key
      if key.nil?
        error { "ignoring invalid key: #{comment_str}" }
        next
      end
      key.extend(Comment)
      key.comment = comment_str
      identities.push key
    rescue NotImplementedError => e
      error { "ignoring unimplemented key:#{e.message} #{comment_str}" }
    end
  end
  return identities
end