class Net::SSH::KeyFactory

key = Net::SSH::KeyFactory.load_public_key(“~/.ssh/id_dsa.pub”)
assert klass.is_a?(OpenSSL::PKey::RSA)
klass = Net::SSH::KeyFactory.get(“rsa”)
will rarely (if ever) be directly used by consumers of the library.
private keys. It used used primarily by Net::SSH itself, internally, and
OpenSSL key instances via their SSH names, and for loading both public and
A factory class for returning new Key classes. It is used for obtaining

def get(name)

empty key of the given type.
Fetch an OpenSSL key instance by its SSH name. It will be a new, 
def get(name)
  MAP.fetch(name).new
end

def load_data_private_key(data, passphrase=nil, ask_passphrase=true, filename="")

prompted to enter their password unless passphrase works.
encrypted (requiring a passphrase to use), the user will be
appropriately. The new key is returned. If the key itself is
whether the file describes an RSA or DSA key, and will load it
Loads a private key. It will correctly determine 
def load_data_private_key(data, passphrase=nil, ask_passphrase=true, filename="")
  if OpenSSL::PKey.respond_to?(:read)
    pkey_read = true
    error_class = ArgumentError
  else
    pkey_read = false
    if data.match(/-----BEGIN DSA PRIVATE KEY-----/)
      key_type = OpenSSL::PKey::DSA
      error_class = OpenSSL::PKey::DSAError
    elsif data.match(/-----BEGIN RSA PRIVATE KEY-----/)
      key_type = OpenSSL::PKey::RSA
      error_class = OpenSSL::PKey::RSAError
    elsif data.match(/-----BEGIN EC PRIVATE KEY-----/) && defined?(OpenSSL::PKey::EC)
      key_type = OpenSSL::PKey::EC
      error_class = OpenSSL::PKey::ECError
    elsif data.match(/-----BEGIN (.+) PRIVATE KEY-----/)
      raise OpenSSL::PKey::PKeyError, "not a supported key type '#{$1}'"
    else
      raise OpenSSL::PKey::PKeyError, "not a private key (#{filename})"
    end
  end
  encrypted_key = data.match(/ENCRYPTED/)
  tries = 0
  begin
    if pkey_read
      return OpenSSL::PKey.read(data, passphrase || 'invalid')
    else
      return key_type.new(data, passphrase || 'invalid')
    end
  rescue error_class
    if encrypted_key && ask_passphrase
      tries += 1
      if tries <= 3
        passphrase = prompt("Enter passphrase for #{filename}:", false)
        retry
      else
        raise
      end
    else
      raise
    end
  end
end

def load_data_public_key(data, filename="")

appropriately. The new public key is returned.
the file describes an RSA or DSA key, and will load it
Loads a public key. It will correctly determine whether 
def load_data_public_key(data, filename="")
  fields = data.split(/ /)
  blob = nil
  begin
    blob = fields.shift
  end while !blob.nil? && !/^(ssh-(rsa|dss)|ecdsa-sha2-nistp\d+)$/.match(blob)
  blob = fields.shift
  raise Net::SSH::Exception, "public key at #{filename} is not valid" if blob.nil?
  blob = blob.unpack("m*").first
  reader = Net::SSH::Buffer.new(blob)
  reader.read_key or raise OpenSSL::PKey::PKeyError, "not a public key #{filename.inspect}"
end

def load_private_key(filename, passphrase=nil, ask_passphrase=true)

prompted to enter their password unless passphrase works.
encrypted (requiring a passphrase to use), the user will be
appropriately. The new key is returned. If the key itself is
whether the file describes an RSA or DSA key, and will load it
Loads a private key from a file. It will correctly determine 
def load_private_key(filename, passphrase=nil, ask_passphrase=true)
  data = File.read(File.expand_path(filename))
  load_data_private_key(data, passphrase, ask_passphrase, filename)
end

def load_public_key(filename)

appropriately. The new public key is returned.
the file describes an RSA or DSA key, and will load it
Loads a public key from a file. It will correctly determine whether 
def load_public_key(filename)
  data = File.read(File.expand_path(filename))
  load_data_public_key(data, filename)
end