module PuTTY::Key::OpenSSL::EC

The {EC} module is included into OpenSSL::PKey::EC when using the PuTTY::Key refinement or calling {PuTTY::Key.global_install}. This adds a to_ppk instance method to OpenSSL::PKey::EC.

Public Instance Methods

to_ppk() click to toggle source

Returns a new {PPK} instance that is equivalent to this key.

to_ppk can be called on instances of OpenSSL::PKey::EC.

@return [PPK] A new instance of {PPK} that is equivalent to this key.

@raise [InvalidStateError] If the key has not been initialized. @raise [UnsupportedCurveError] If the key uses a curve that is not supported by PuTTY.

# File lib/putty/key/openssl.rb, line 143
def to_ppk
  curve = group && group.curve_name
  raise InvalidStateError, 'The key has not been fully initialized (a curve name must be assigned)' unless curve
  ssh_curve = SSH_CURVES[curve]
  raise UnsupportedCurveError, "The curve '#{curve}' is not supported" unless ssh_curve

  PPK.new.tap do |ppk|
    ppk.algorithm = "ecdsa-sha2-#{ssh_curve}"
    begin
      ppk.public_blob = Util.ssh_pack(ppk.algorithm, ssh_curve, public_key && public_key.to_bn)
      ppk.private_blob = Util.ssh_pack(private_key)
    rescue NilValueError
      raise InvalidStateError, 'The key has not been fully initialized (public_key and private_key must both be assigned)'
    end
  end
end