defmodule HandshakeTest do
  use ExUnit.Case, async: true
  doctest ExWire.Handshake
  alias ExWire.Handshake

  describe "new/1" do
    test "marks the owner as the initiator and sets remote public key" do
      her_static_public_key = ExthCrypto.Test.public_key(:key_b)

      handshake = Handshake.new(her_static_public_key)

      assert handshake.initiator == true
      assert handshake.remote_pub == her_static_public_key
    end

    test "generates a nonce and an ephemeral key pair" do
      her_static_public_key = ExthCrypto.Test.public_key(:key_b)
      handshake_nonce_length = 32

      handshake = Handshake.new(her_static_public_key)

      {public_key, private_key} = handshake.random_key_pair
      assert {:ok, ^public_key} = ExthCrypto.Signature.get_public_key(private_key)
      assert byte_size(handshake.init_nonce) == handshake_nonce_length
    end
  end

  describe "new_response/0" do
    test "marks the owner as the recipient" do
      handshake = Handshake.new_response()

      assert handshake.initiator == false
    end

    test "generates a nonce and an ephemeral key pair" do
      handshake_nonce_length = 32

      handshake = Handshake.new_response()

      {public_key, private_key} = handshake.random_key_pair
      assert {:ok, ^public_key} = ExthCrypto.Signature.get_public_key(private_key)
      assert byte_size(handshake.resp_nonce) == handshake_nonce_length
    end
  end

  describe "generate_auth/1" do
    test "generates an encoded AuthMsgV4" do
      her_static_public_key = ExthCrypto.Test.public_key(:key_b)
      her_static_private_key = ExthCrypto.Test.private_key(:key_b)
      my_static_public_key = ExthCrypto.Test.public_key(:key_a)
      my_static_private_key = ExthCrypto.Test.private_key(:key_a)

      set_environment(my_static_private_key)

      handshake =
        her_static_public_key
        |> Handshake.new()
        |> Handshake.generate_auth()

      set_environment(her_static_private_key)

      {:ok, auth_msg, <<>>} =
        Handshake.read_auth_msg(handshake.encoded_auth_msg, her_static_private_key)

      assert handshake.auth_msg == remove_ephemeral_public_key(auth_msg)
      assert auth_msg.initiator_public_key == my_static_public_key
      assert auth_msg.initiator_nonce == handshake.init_nonce
    end
  end

  describe "handle_auth/1 and handle_ack/2" do
    test "decode auth/ack via eip-8 and generate secrets" do
      my_static_private_key = ExthCrypto.Test.private_key(:key_a)
      her_static_public_key = ExthCrypto.Test.public_key(:key_b)
      her_static_private_key = ExthCrypto.Test.private_key(:key_b)

      set_environment(my_static_private_key)

      my_handshake =
        her_static_public_key
        |> Handshake.new()
        |> Handshake.generate_auth()

      set_environment(her_static_private_key)

      {:ok, her_handshake, her_secrets} =
        Handshake.new_response()
        |> Handshake.handle_auth(my_handshake.encoded_auth_msg)

      # Same auth message, except remote has added the initiator ephemeral public key
      assert my_handshake.auth_msg == remove_ephemeral_public_key(her_handshake.auth_msg)
      assert %ExWire.Framing.Secrets{} = her_secrets

      set_environment(my_static_private_key)

      assert {:ok, my_updated_handshake, my_secrets, <<>>} =
               Handshake.handle_ack(my_handshake, her_handshake.encoded_ack_resp)

      assert my_updated_handshake.ack_resp == her_handshake.ack_resp
      assert %ExWire.Framing.Secrets{} = my_secrets
    end
  end

  describe "EIP-8 test vectors" do
    test "handshake auth plain" do
      secret =
        "b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291"
        |> ExthCrypto.Math.hex_to_bin()

      auth =
        """
        048ca79ad18e4b0659fab4853fe5bc58eb83992980f4c9cc147d2aa31532efd29a3d3dc6a3d89eaf
        913150cfc777ce0ce4af2758bf4810235f6e6ceccfee1acc6b22c005e9e3a49d6448610a58e98744
        ba3ac0399e82692d67c1f58849050b3024e21a52c9d3b01d871ff5f210817912773e610443a9ef14
        2e91cdba0bd77b5fdf0769b05671fc35f83d83e4d3b0b000c6b2a1b1bba89e0fc51bf4e460df3105
        c444f14be226458940d6061c296350937ffd5e3acaceeaaefd3c6f74be8e23e0f45163cc7ebd7622
        0f0128410fd05250273156d548a414444ae2f7dea4dfca2d43c057adb701a715bf59f6fb66b2d1d2
        0f2c703f851cbf5ac47396d9ca65b6260bd141ac4d53e2de585a73d1750780db4c9ee4cd4d225173
        a4592ee77e2bd94d0be3691f3b406f9bba9b591fc63facc016bfa8
        """
        |> String.replace("\n", "")
        |> ExthCrypto.Math.hex_to_bin()

      {:ok, auth_msg, <<>>} = Handshake.read_auth_msg(auth, secret)

      assert auth_msg.initiator_public_key ==
               "fda1cff674c90c9a197539fe3dfb53086ace64f83ed7c6eabec741f7f381cc803e52ab2cd55d5569bce4347107a310dfd5f88a010cd2ffd1005ca406f1842877"
               |> ExthCrypto.Math.hex_to_bin()

      assert auth_msg.initiator_nonce ==
               "7e968bba13b6c50e2c4cd7f241cc0d64d1ac25c7f5952df231ac6a2bda8ee5d6"
               |> ExthCrypto.Math.hex_to_bin()

      assert auth_msg.initiator_ephemeral_public_key ==
               "654d1044b69c577a44e5f01a1209523adb4026e70c62d1c13a067acabc09d2667a49821a0ad4b634554d330a15a58fe61f8a8e0544b310c6de7b0c8da7528a8d"
               |> ExthCrypto.Math.hex_to_bin()

      assert auth_msg.initiator_version == 63
    end

    test "handshake auth eip 8" do
      secret =
        "b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291"
        |> ExthCrypto.Math.hex_to_bin()

      auth =
        """
        01b304ab7578555167be8154d5cc456f567d5ba302662433674222360f08d5f1534499d3678b513b
        0fca474f3a514b18e75683032eb63fccb16c156dc6eb2c0b1593f0d84ac74f6e475f1b8d56116b84
        9634a8c458705bf83a626ea0384d4d7341aae591fae42ce6bd5c850bfe0b999a694a49bbbaf3ef6c
        da61110601d3b4c02ab6c30437257a6e0117792631a4b47c1d52fc0f8f89caadeb7d02770bf999cc
        147d2df3b62e1ffb2c9d8c125a3984865356266bca11ce7d3a688663a51d82defaa8aad69da39ab6
        d5470e81ec5f2a7a47fb865ff7cca21516f9299a07b1bc63ba56c7a1a892112841ca44b6e0034dee
        70c9adabc15d76a54f443593fafdc3b27af8059703f88928e199cb122362a4b35f62386da7caad09
        c001edaeb5f8a06d2b26fb6cb93c52a9fca51853b68193916982358fe1e5369e249875bb8d0d0ec3
        6f917bc5e1eafd5896d46bd61ff23f1a863a8a8dcd54c7b109b771c8e61ec9c8908c733c0263440e
        2aa067241aaa433f0bb053c7b31a838504b148f570c0ad62837129e547678c5190341e4f1693956c
        3bf7678318e2d5b5340c9e488eefea198576344afbdf66db5f51204a6961a63ce072c8926c
        """
        |> String.replace("\n", "")
        |> ExthCrypto.Math.hex_to_bin()

      {:ok, auth_msg, <<>>} = Handshake.read_auth_msg(auth, secret)

      assert auth_msg.initiator_public_key ==
               "fda1cff674c90c9a197539fe3dfb53086ace64f83ed7c6eabec741f7f381cc803e52ab2cd55d5569bce4347107a310dfd5f88a010cd2ffd1005ca406f1842877"
               |> ExthCrypto.Math.hex_to_bin()

      assert auth_msg.initiator_nonce ==
               "7e968bba13b6c50e2c4cd7f241cc0d64d1ac25c7f5952df231ac6a2bda8ee5d6"
               |> ExthCrypto.Math.hex_to_bin()

      assert auth_msg.initiator_ephemeral_public_key ==
               "654d1044b69c577a44e5f01a1209523adb4026e70c62d1c13a067acabc09d2667a49821a0ad4b634554d330a15a58fe61f8a8e0544b310c6de7b0c8da7528a8d"
               |> ExthCrypto.Math.hex_to_bin()

      assert auth_msg.initiator_version == 4
    end

    test "handshake auth eip 8 - 2" do
      secret =
        "b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291"
        |> ExthCrypto.Math.hex_to_bin()

      auth =
        """
        01b8044c6c312173685d1edd268aa95e1d495474c6959bcdd10067ba4c9013df9e40ff45f5bfd6f7
        2471f93a91b493f8e00abc4b80f682973de715d77ba3a005a242eb859f9a211d93a347fa64b597bf
        280a6b88e26299cf263b01b8dfdb712278464fd1c25840b995e84d367d743f66c0e54a586725b7bb
        f12acca27170ae3283c1073adda4b6d79f27656993aefccf16e0d0409fe07db2dc398a1b7e8ee93b
        cd181485fd332f381d6a050fba4c7641a5112ac1b0b61168d20f01b479e19adf7fdbfa0905f63352
        bfc7e23cf3357657455119d879c78d3cf8c8c06375f3f7d4861aa02a122467e069acaf513025ff19
        6641f6d2810ce493f51bee9c966b15c5043505350392b57645385a18c78f14669cc4d960446c1757
        1b7c5d725021babbcd786957f3d17089c084907bda22c2b2675b4378b114c601d858802a55345a15
        116bc61da4193996187ed70d16730e9ae6b3bb8787ebcaea1871d850997ddc08b4f4ea668fbf3740
        7ac044b55be0908ecb94d4ed172ece66fd31bfdadf2b97a8bc690163ee11f5b575a4b44e36e2bfb2
        f0fce91676fd64c7773bac6a003f481fddd0bae0a1f31aa27504e2a533af4cef3b623f4791b2cca6
        d490
        """
        |> String.replace("\n", "")
        |> ExthCrypto.Math.hex_to_bin()

      {:ok, auth_msg, <<>>} = Handshake.read_auth_msg(auth, secret)

      assert auth_msg.initiator_public_key ==
               "fda1cff674c90c9a197539fe3dfb53086ace64f83ed7c6eabec741f7f381cc803e52ab2cd55d5569bce4347107a310dfd5f88a010cd2ffd1005ca406f1842877"
               |> ExthCrypto.Math.hex_to_bin()

      assert auth_msg.initiator_nonce ==
               "7e968bba13b6c50e2c4cd7f241cc0d64d1ac25c7f5952df231ac6a2bda8ee5d6"
               |> ExthCrypto.Math.hex_to_bin()

      assert auth_msg.initiator_ephemeral_public_key ==
               "654d1044b69c577a44e5f01a1209523adb4026e70c62d1c13a067acabc09d2667a49821a0ad4b634554d330a15a58fe61f8a8e0544b310c6de7b0c8da7528a8d"
               |> ExthCrypto.Math.hex_to_bin()

      assert auth_msg.initiator_version == 56
    end

    test "handshake ack plain" do
      _recipient_public_key =
        "fda1cff674c90c9a197539fe3dfb53086ace64f83ed7c6eabec741f7f381cc803e52ab2cd55d5569bce4347107a310dfd5f88a010cd2ffd1005ca406f1842877"
        |> ExthCrypto.Math.hex_to_bin()

      secret =
        "49a7b37aa6f6645917e7b807e9d1c00d4fa71f18343b0d4122a4d2df64dd6fee"
        |> ExthCrypto.Math.hex_to_bin()

      ack =
        """
        049f8abcfa9c0dc65b982e98af921bc0ba6e4243169348a236abe9df5f93aa69d99cadddaa387662
        b0ff2c08e9006d5a11a278b1b3331e5aaabf0a32f01281b6f4ede0e09a2d5f585b26513cb794d963
        5a57563921c04a9090b4f14ee42be1a5461049af4ea7a7f49bf4c97a352d39c8d02ee4acc416388c
        1c66cec761d2bc1c72da6ba143477f049c9d2dde846c252c111b904f630ac98e51609b3b1f58168d
        dca6505b7196532e5f85b259a20c45e1979491683fee108e9660edbf38f3add489ae73e3dda2c71b
        d1497113d5c755e942d1
        """
        |> String.replace("\n", "")
        |> ExthCrypto.Math.hex_to_bin()

      {:ok, ack_resp, _ack_resp_bin, <<>>} = Handshake.read_ack_resp(ack, secret)

      assert ack_resp.recipient_nonce ==
               "559aead08264d5795d3909718cdd05abd49572e84fe55590eef31a88a08fdffd"
               |> ExthCrypto.Math.hex_to_bin()

      assert ack_resp.recipient_ephemeral_public_key ==
               "b6d82fa3409da933dbf9cb0140c5dde89f4e64aec88d476af648880f4a10e1e49fe35ef3e69e93dd300b4797765a747c6384a6ecf5db9c2690398607a86181e4"
               |> ExthCrypto.Math.hex_to_bin()

      assert ack_resp.recipient_version == 63
    end

    test "handshake ack eip 8" do
      _recipient_public_key =
        "fda1cff674c90c9a197539fe3dfb53086ace64f83ed7c6eabec741f7f381cc803e52ab2cd55d5569bce4347107a310dfd5f88a010cd2ffd1005ca406f1842877"
        |> ExthCrypto.Math.hex_to_bin()

      secret =
        "49a7b37aa6f6645917e7b807e9d1c00d4fa71f18343b0d4122a4d2df64dd6fee"
        |> ExthCrypto.Math.hex_to_bin()

      ack =
        """
        01ea0451958701280a56482929d3b0757da8f7fbe5286784beead59d95089c217c9b917788989470
        b0e330cc6e4fb383c0340ed85fab836ec9fb8a49672712aeabbdfd1e837c1ff4cace34311cd7f4de
        05d59279e3524ab26ef753a0095637ac88f2b499b9914b5f64e143eae548a1066e14cd2f4bd7f814
        c4652f11b254f8a2d0191e2f5546fae6055694aed14d906df79ad3b407d94692694e259191cde171
        ad542fc588fa2b7333313d82a9f887332f1dfc36cea03f831cb9a23fea05b33deb999e85489e645f
        6aab1872475d488d7bd6c7c120caf28dbfc5d6833888155ed69d34dbdc39c1f299be1057810f34fb
        e754d021bfca14dc989753d61c413d261934e1a9c67ee060a25eefb54e81a4d14baff922180c395d
        3f998d70f46f6b58306f969627ae364497e73fc27f6d17ae45a413d322cb8814276be6ddd13b885b
        201b943213656cde498fa0e9ddc8e0b8f8a53824fbd82254f3e2c17e8eaea009c38b4aa0a3f306e8
        797db43c25d68e86f262e564086f59a2fc60511c42abfb3057c247a8a8fe4fb3ccbadde17514b7ac
        8000cdb6a912778426260c47f38919a91f25f4b5ffb455d6aaaf150f7e5529c100ce62d6d92826a7
        1778d809bdf60232ae21ce8a437eca8223f45ac37f6487452ce626f549b3b5fdee26afd2072e4bc7
        5833c2464c805246155289f4
        """
        |> String.replace("\n", "")
        |> ExthCrypto.Math.hex_to_bin()

      {:ok, ack_resp, _ack_resp_bin, <<>>} = Handshake.read_ack_resp(ack, secret)

      assert ack_resp.recipient_nonce ==
               "559aead08264d5795d3909718cdd05abd49572e84fe55590eef31a88a08fdffd"
               |> ExthCrypto.Math.hex_to_bin()

      assert ack_resp.recipient_ephemeral_public_key ==
               "b6d82fa3409da933dbf9cb0140c5dde89f4e64aec88d476af648880f4a10e1e49fe35ef3e69e93dd300b4797765a747c6384a6ecf5db9c2690398607a86181e4"
               |> ExthCrypto.Math.hex_to_bin()

      assert ack_resp.recipient_version == 4
    end

    test "handshake ack eip 8 - 2" do
      _recipient_public_key =
        "fda1cff674c90c9a197539fe3dfb53086ace64f83ed7c6eabec741f7f381cc803e52ab2cd55d5569bce4347107a310dfd5f88a010cd2ffd1005ca406f1842877"
        |> ExthCrypto.Math.hex_to_bin()

      secret =
        "49a7b37aa6f6645917e7b807e9d1c00d4fa71f18343b0d4122a4d2df64dd6fee"
        |> ExthCrypto.Math.hex_to_bin()

      ack =
        """
        01f004076e58aae772bb101ab1a8e64e01ee96e64857ce82b1113817c6cdd52c09d26f7b90981cd7
        ae835aeac72e1573b8a0225dd56d157a010846d888dac7464baf53f2ad4e3d584531fa203658fab0
        3a06c9fd5e35737e417bc28c1cbf5e5dfc666de7090f69c3b29754725f84f75382891c561040ea1d
        dc0d8f381ed1b9d0d4ad2a0ec021421d847820d6fa0ba66eaf58175f1b235e851c7e2124069fbc20
        2888ddb3ac4d56bcbd1b9b7eab59e78f2e2d400905050f4a92dec1c4bdf797b3fc9b2f8e84a482f3
        d800386186712dae00d5c386ec9387a5e9c9a1aca5a573ca91082c7d68421f388e79127a5177d4f8
        590237364fd348c9611fa39f78dcdceee3f390f07991b7b47e1daa3ebcb6ccc9607811cb17ce51f1
        c8c2c5098dbdd28fca547b3f58c01a424ac05f869f49c6a34672ea2cbbc558428aa1fe48bbfd6115
        8b1b735a65d99f21e70dbc020bfdface9f724a0d1fb5895db971cc81aa7608baa0920abb0a565c9c
        436e2fd13323428296c86385f2384e408a31e104670df0791d93e743a3a5194ee6b076fb6323ca59
        3011b7348c16cf58f66b9633906ba54a2ee803187344b394f75dd2e663a57b956cb830dd7a908d4f
        39a2336a61ef9fda549180d4ccde21514d117b6c6fd07a9102b5efe710a32af4eeacae2cb3b1dec0
        35b9593b48b9d3ca4c13d245d5f04169b0b1
        """
        |> String.replace("\n", "")
        |> ExthCrypto.Math.hex_to_bin()

      {:ok, ack_resp, _ack_resp_bin, <<>>} = Handshake.read_ack_resp(ack, secret)

      assert ack_resp.recipient_nonce ==
               "559aead08264d5795d3909718cdd05abd49572e84fe55590eef31a88a08fdffd"
               |> ExthCrypto.Math.hex_to_bin()

      assert ack_resp.recipient_ephemeral_public_key ==
               "b6d82fa3409da933dbf9cb0140c5dde89f4e64aec88d476af648880f4a10e1e49fe35ef3e69e93dd300b4797765a747c6384a6ecf5db9c2690398607a86181e4"
               |> ExthCrypto.Math.hex_to_bin()

      assert ack_resp.recipient_version == 57
    end
  end

  defp remove_ephemeral_public_key(auth_msg) do
    %{auth_msg | initiator_ephemeral_public_key: nil}
  end

  def set_environment(private_key) do
    Application.put_env(:ex_wire, :private_key, private_key)
  end
end
