@type t() ::
  %SBoM.CycloneDX.V16.CryptoProperties.ProtocolProperties.Ikev2TransformTypes{
    __unknown_fields__: [Protobuf.unknown_field()],
    auth: [String.t()],
    encr: [String.t()],
    esn: boolean() | nil,
    integ: [String.t()],
    ke: [String.t()],
    prf: [String.t()]
  }