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CA CXC 138 21 Certificate Authority

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ca lib agreement EC curve.ex
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lib/agreement/EC/curve.ex 

defmodule CA.Curve do

  @moduledoc false

  require CA.Integer

  require CA.Point

  defstruct [:A, :B, :P, :N, :G, :name, :oid]

  def contains?(curve, p) do

      cond do

        p.x < 0 || p.x > curve."P" - 1 -> false

        p.y < 0 || p.y > curve."P" - 1 -> false

        CA.Integer.ipow(p.y, 2) - (CA.Integer.ipow(p.x, 3) + curve."A" * p.x + curve."B")

          |> CA.Integer.modulo(curve."P") != 0 -> false

        true -> true

      end

  end

  def getLength(curve) do

      div(1 + String.length(Integer.to_string(curve."N", 16)), 2)

  end

end