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Wechat API wrapper in Elixir.

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wechat lib plug crypto wechat_signature_verifier.ex
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lib/plug/crypto/wechat_signature_verifier.ex 

defmodule Plug.Crypto.WechatSignatureVerifier do

  @moduledoc """

  Verify wechat signature.

  """



  def verify(args, signature) do

    challenge = args |> Enum.sort |> Enum.join |> sha1

    Plug.Crypto.secure_compare(challenge, signature)

  end



  defp sha1(str) do

    digest = :crypto.hash(:sha, str)

    Base.encode16(digest, case: :lower)

  end

end