class OpenSSL::PKCS12

def self.create(pass, name, key, cert)
  pkcs12 = self.new(pass, name, key, cert)
  pkcs12.generate
  pkcs12
end

def generate
  key_reader = StringReader.new(key.to_pem)
  key_pair = PEMReader.new(key_reader).read_object
  cert_input_stream = StringBufferInputStream.new(certificate.to_pem)
  certs = CertificateFactory.get_instance("X.509").generate_certificates(cert_input_stream)
  store = KeyStore.get_instance("PKCS12", "BC")
  store.load(nil, nil)
  store.set_key_entry(@name, key_pair.get_private, nil, certs.to_array(Java::java.security.cert.Certificate[certs.size].new))
  pkcs12_output_stream = ByteArrayOutputStream.new
  store.store(pkcs12_output_stream, @pass.to_java.to_char_array)
  @der = String.from_java_bytes(pkcs12_output_stream.to_byte_array)
end

def initialize(pass, name, key, cert)
  @pass = pass
  @name = name
  @key = key
  @certificate = cert
end

def to_der
  @der
end