text: 
  def generate_private_key(curve, backend):
      pass
  
  class SECT571R1(object):
      name = "sect571r1"
      key_size = 570
  
  
  class SECP384R1(object):
      name = "secp384r1"
      key_size = 384
  
  
  class SECP224R1(object):
      name = "secp224r1"
      key_size = 224
  
  
  class SECT163K1(object):
      name = "sect163k1"
      key_size = 163