diff --git a/.formatter.exs b/.formatter.exs
new file mode 100644
index 0000000..d2cda26
--- /dev/null
+++ b/.formatter.exs
@@ -0,0 +1,4 @@
+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]
diff --git a/.gitignore b/.gitignore
index 86e4c3f..37b182b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,9 +1,24 @@
-/_build
-/cover
-/deps
-/doc
+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
 /.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
 erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
 *.ez
-*.beam
-/config/*.secret.exs
+
+# Ignore package tarball (built via "mix hex.build").
+rfc5849-*.tar
+
diff --git a/README.md b/README.md
index cb5fa21..1cc29e5 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,21 @@
-# rfc5849
-OAuth/1 Elixir Implementation based on OTP 
+# Rfc5849
+
+**TODO: Add description**
+
+## Installation
+
+If [available in Hex](https://hex.pm/docs/publish), the package can be installed
+by adding `rfc5849` to your list of dependencies in `mix.exs`:
+
+```elixir
+def deps do
+  [
+    {:rfc5849, "~> 0.1.0"}
+  ]
+end
+```
+
+Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
+and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
+be found at [https://hexdocs.pm/rfc5849](https://hexdocs.pm/rfc5849).
+
diff --git a/config/config.exs b/config/config.exs
new file mode 100644
index 0000000..afeed98
--- /dev/null
+++ b/config/config.exs
@@ -0,0 +1,30 @@
+# This file is responsible for configuring your application
+# and its dependencies with the aid of the Mix.Config module.
+use Mix.Config
+
+# This configuration is loaded before any dependency and is restricted
+# to this project. If another project depends on this project, this
+# file won't be loaded nor affect the parent project. For this reason,
+# if you want to provide default values for your application for
+# third-party users, it should be done in your "mix.exs" file.
+
+# You can configure your application as:
+#
+#     config :rfc5849, key: :value
+#
+# and access this configuration in your application as:
+#
+#     Application.get_env(:rfc5849, :key)
+#
+# You can also configure a third-party app:
+#
+#     config :logger, level: :info
+#
+
+# It is also possible to import configuration files, relative to this
+# directory. For example, you can emulate configuration per environment
+# by uncommenting the line below and defining dev.exs, test.exs and such.
+# Configuration from the imported file will override the ones defined
+# here (which is why it is important to import them last).
+#
+#     import_config "#{Mix.env()}.exs"
diff --git a/lib/rfc5849.ex b/lib/rfc5849.ex
new file mode 100644
index 0000000..576bb08
--- /dev/null
+++ b/lib/rfc5849.ex
@@ -0,0 +1,71 @@
+defmodule Rfc5849 do
+  
+  @moduledoc """
+  Documentation for Rfc5849.
+  """
+
+  defstruct [
+    realm: nil,
+    consumer_key: nil,
+    consumer_secret: nil, # must be protected
+    token: nil,
+    token_secret: nil, # must be protected    
+    callback: nil,
+    verifier: nil,
+    signature: nil,
+    signature_method: :hmac_sha1,
+    timestamp: nil,
+    nonce: nil,
+    client: %{
+      method: nil,
+      headers: nil,
+      params: nil
+    }
+    request: {}
+  ]
+  
+  use GenServer
+
+  @doc """
+  """
+  def init(args) do
+    {:ok, args}
+  end
+
+  @doc """
+  """
+  def terminate(reason, state) do
+  end
+
+  @doc """
+  """
+  def handle_call(message, from, state) do
+  end
+
+  @doc """
+  """
+  def handle_cast({:set, {:client, param}}, state) do
+    case param do
+      {:method, method} -> :ok
+      {:headers, headers} -> :ok
+      {:params, params} -> :ok
+    end
+  end
+  def handle_cast({:set, {:oauth, oauth}}, state) do
+    case oauth do
+      {:consumer_key, consumer_key} -> :ok
+      {:consumer_secret, consumer_secret} -> :ok
+      {:token, token} -> :ok
+      {:token_secret, token_secret} -> :ok
+      {:signature_method, signature_method} -> :ok
+    end
+  end
+  def handle_cast(message, state) do
+  end
+
+  @doc """
+  """
+  def handle_info(message, state) do
+  end
+
+end
diff --git a/lib/rfc5849.ex~ b/lib/rfc5849.ex~
new file mode 100644
index 0000000..49c6784
--- /dev/null
+++ b/lib/rfc5849.ex~
@@ -0,0 +1,18 @@
+defmodule Rfc5849 do
+  @moduledoc """
+  Documentation for Rfc5849.
+  """
+
+  @doc """
+  Hello world.
+
+  ## Examples
+
+      iex> Rfc5849.hello()
+      :world
+
+  """
+  def hello do
+    :world
+  end
+end
diff --git a/lib/rfc5849_lib.ex b/lib/rfc5849_lib.ex
new file mode 100644
index 0000000..7fee699
--- /dev/null
+++ b/lib/rfc5849_lib.ex
@@ -0,0 +1,145 @@
+defmodule Rfc5849.Lib do
+
+  @moduledoc """
+  > request = %Rfc5849{}
+  > Rfc5849.Lib.request(request)
+  {:ok, method, target, header, params}
+  """
+
+  def encode_percent(str) do
+    str |> URI.encode(&URI.char_unreserved?/1)
+  end
+
+  @doc """
+  Add a nonce (24bytes) in Rfc5849 structure
+  """
+  @spec nonce(Rfc5849.t()) :: Rfc5849.t()
+  def nonce(struct) do
+    nonce(struct, 24)
+  end
+
+  @doc """
+  Add a nonce with a defined size in Rfc5849 structure
+  """
+  @spec nonce(Rfc5849.t(), integer()) :: Rfc5849.t()
+  def nonce(struct, size) do
+    %Rfc5849{struct|nonce: gen_nonce(size)}
+  end
+
+  @doc """
+  Generate a nonce with `:crypto.string_rand_bytes` function and
+  encode it in base64. This code is based on OAuther.
+  """
+  defp gen_nonce(size) do
+    :crypto.strong_rand_bytes(size) |> Base.encode64()
+  end
+  
+  @doc """
+  add a timestamp to Rfc5849 structure.
+  """
+  @spec timestamp(Rfc5849.t()) :: Rfc5849.t()
+  def timestamp(struct) do
+    %Rfc5849{struct|timestamp: gen_timestamp()}
+  end
+
+  @doc """
+  Generate a timestamp based on `:os.timestamp()` function. This code
+  is based on OAuther
+  """
+  defp gen_timestamp() do
+    {megasec, sec, _microsec} = :os.timestamp()
+    megasec * 1_000_000 + sec
+  end
+
+  @doc """
+  Generate a signature based on information present in the Rfc5849
+  structure
+  """
+  @spec sign(Rfc5849.t()) :: Rfc5849.t()
+  def sign(%Rfc5849{signature_method: signature_method} = struct) do
+  end
+
+  @doc """
+  Generate a signature based on information in the Rfc5849 with a
+  different method.
+  """
+  @spec sign(Rfc5849.t(), atom()) :: Rfc5849.t()
+  def sign(struct, method) do
+    :ok
+  end
+  
+  @doc """
+  Generate a plaintext signature and return it
+  """
+  @spec gen_signature_plain(Rfc5849.t()) :: string()
+  defp gen_signature_plain(struct) do
+    :ok
+  end
+
+  @doc """
+  Generate hmac-sha1 signature and return it.
+  """
+  @spec gen_signature_sha1(Rfc5849.t()) :: string()
+  defp gen_signature_sha1(struct) do
+    :ok
+  end
+
+  @doc """
+  Generate rsa-sha1 signature and return it.
+  """
+  @spec gen_signature_rsa(Rfc5849.t()) :: string()
+  defp gen_signature_rsa(struct) do
+    :ok
+  end
+
+
+  @doc """
+  Change the signature_method and regenerate the signature
+  """
+  @spec signature_method(Rfc5849.t(), string()) :: Rfc5849.t()
+  def signature_method(struct, method) do
+    %Rfc5849{struct|signature_method: method} |> sign
+  end
+
+  @doc """
+  Set the callback and encode it correctly.
+  """
+  @spec callback(Rfc5849.t(), string()) :: Rfc5849.t()
+  def callback(struct, callback) do
+    %Rfc5849{struct|callback: callback}
+  end
+
+  @doc """
+  Set the verifier and encode it correctly.
+  """
+  @spec verifier(Rfc5849.t(), string() | function()) :: Rfc5849.t()
+  def verifier(struct, verifier) do
+    %Rfc5849{struct|verifier: verifier}
+  end
+
+  @doc """
+  Set the consumer_secret, this value can be a function returning
+  {:ok, secret} or a string.
+  """
+  @spec consumer_secret(Rfc5849.t(), string() | function()) :: Rfc5849.t()
+  def consumer_secret(struct, secret) do
+  end
+
+  @doc """
+  Set the token_secret, this value can be a function returning
+  {:ok, secret} or a string.
+  """
+  @spec token_secret(Rfc5849.t(), string() | function()) :: Rfc5849.t()
+  def token_secret(struct, secret) do
+  end
+
+  @doc """
+  Generate a base string based on the content of the structure
+  """
+  def gen_base_string(struct) do
+    method = struct.method
+    host = struct.host
+    path = struct.path
+    query = struct.query
+  end
+end
diff --git a/lib/rfc5849_lib.ex~ b/lib/rfc5849_lib.ex~
new file mode 100644
index 0000000..d261fb7
--- /dev/null
+++ b/lib/rfc5849_lib.ex~
@@ -0,0 +1,2 @@
+defmodule Rfc5869.Lib do
+end
diff --git a/mix.exs b/mix.exs
new file mode 100644
index 0000000..fb73591
--- /dev/null
+++ b/mix.exs
@@ -0,0 +1,28 @@
+defmodule Rfc5849.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :rfc5849,
+      version: "0.1.0",
+      elixir: "~> 1.8",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      # {:dep_from_hexpm, "~> 0.3.0"},
+      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
+    ]
+  end
+end
diff --git a/test/rfc5849_lib_test.exs b/test/rfc5849_lib_test.exs
new file mode 100644
index 0000000..a07864a
--- /dev/null
+++ b/test/rfc5849_lib_test.exs
@@ -0,0 +1,113 @@
+defmodule Rfc5849.LibTest do
+
+  test "URI" do
+    :ok
+  end
+
+  test "do percent encoding" do
+    original = "https://photos.example.net/initiate"
+    result = "https%3A%2F%2Fphotos.example.net%2Finitiate"
+    assert(Rfc5849.Lib.encode_percent(original) == result)
+  end
+  
+  test "generate signature base string" do
+    struct = model_base_string()
+    result = ["POST&http%3A%2F%2Fexample.com%2Frequest&a2%3Dr%2520b%26a3%3D2%2520q",
+	      "%26a3%3Da%26b5%3D%253D%25253D%26c%2540%3D%26c2%3D%26oauth_consumer_",
+	      "key%3D9djdj82h48djs9d2%26oauth_nonce%3D7d8f3e4a%26oauth_signature_m",
+	      "ethod%3DHMAC-SHA1%26oauth_timestamp%3D137131201%26oauth_token%3Dkkk",
+	      "9d7dh3k39sjv7"]
+    assert(Rfc5849.Lib.base_string(struct) == result)
+  end
+  
+  test "set token secret" do
+    struct = %Rfc5849{}
+    Rfc5849.Lib.token_secret(struct)
+  end
+
+  test "set consumer secret" do
+    struct = %Rfc5849{}
+    Rfc5849.Lib.consumer_secret(struct)
+  end
+  
+  test "generate nonce" do
+    struct = %Rfc5849{}
+    Rfc5849.Lib.nonce(struct)
+  end
+
+  test "generate timestamp" do
+    struct = %Rfc5849{}
+    Rfc5849.Lib.timestamp(struct)
+  end
+
+  test "generate plaintext signature" do
+    struct = %Rfc5849{}
+    Rfc5849.Lib.signature(struct, :plain)
+  end
+
+  test "generate hmac-sha1 signature" do
+    struct = %Rfc5849{}
+    Rfc5849.Lib.signature(struct, :hmac_sha1)
+  end
+
+  test "generate rsa-sha1 signature" do
+    struct = %Rfc5849{}
+    Rfc5849.Lib.signature(struct, :rsa_sha1)
+  end
+
+  defp model1 do
+    %Rfc5849{
+      consumer_key: "dpf43f3p2l4k3l03",
+      consumer_secret: "kd94hf93k423kf44",
+      signature_method: "HMAC-SHA1",
+      timestamp: "137131200",
+      nonce: "wIjqoS",
+      callback: "http%3A%2F%2Fprinter.example.com%2Fready",
+      signature: "74KNZJeDHnMBp0EMJ9ZHt%2FXKycU%3D",
+      realm: "Photos"
+    }
+  end
+
+  defp model2 do
+    %Rfc5849{
+      consumer_key: "dpf43f3p2l4k3l03",
+      consumer_secret: "kd94hf93k423kf44",
+      token: "hh5s93j4hdidpola",
+      signature_method: "HMAC-SHA1",
+      timestamp: "137131201",
+      nonce: "walatlh",
+      verifier: "hfdp7dh39dks9884",
+      callback: "http%3A%2F%2Fprinter.example.com%2Fready",
+      signature: "gKgrFCywp7rO0OXSjdot%2FIHF7IU%3D",
+      realm: "Photos"
+    }
+  end
+
+  defp model3 do
+    %Rfc5849{
+      consumer_key: "dpf43f3p2l4k3l03",
+      consumer_secret: "kd94hf93k423kf44",
+      token: "nnch734d00sl2jdk",
+      signature_method: "HMAC-SHA1",
+      timestamp: "137131202",
+      nonce: "chapoH",
+      verifier: "hfdp7dh39dks9884",
+      signature: "MdpQcU8iPSUjWoN%2FUDMsK2sui9I%3D",
+      realm: "Photos"      
+    }
+  end
+
+  def model_base_string do
+    %Rfc5849{
+      consumer_key: "9djdj82h48djs9d2",
+      consumer_secret: "kd94hf93k423kf44",
+      token: "kkk9d7dh3k39sjv7",
+      signature_method: "HMAC-SHA1",
+      timestamp: "137131201",
+      nonce: "7d8f3e4a",
+      signature: "MdpQcU8iPSUjWoN%2FUDMsK2sui9I%3D",
+      realm: "bYT5CMsGcbgUdFHObYMEfcx6bsw%3D"
+    }
+  end
+  
+end
diff --git a/test/rfc5849_lib_test.exs~ b/test/rfc5849_lib_test.exs~
new file mode 100644
index 0000000..f7e38cf
--- /dev/null
+++ b/test/rfc5849_lib_test.exs~
@@ -0,0 +1,11 @@
+defmodule Rfc5849.LibTest do
+
+  test "generate signature base string" do
+    :ok
+  end
+
+  test "generate signature" do
+    :ok
+  end
+  
+end
diff --git a/test/rfc5849_test.exs b/test/rfc5849_test.exs
new file mode 100644
index 0000000..400e39a
--- /dev/null
+++ b/test/rfc5849_test.exs
@@ -0,0 +1,8 @@
+defmodule Rfc5849Test do
+  use ExUnit.Case
+  doctest Rfc5849
+
+  test "greets the world" do
+    assert Rfc5849.hello() == :world
+  end
+end
diff --git a/test/rfc5849_test.exs~ b/test/rfc5849_test.exs~
new file mode 100644
index 0000000..400e39a
--- /dev/null
+++ b/test/rfc5849_test.exs~
@@ -0,0 +1,8 @@
+defmodule Rfc5849Test do
+  use ExUnit.Case
+  doctest Rfc5849
+
+  test "greets the world" do
+    assert Rfc5849.hello() == :world
+  end
+end
diff --git a/test/test_helper.exs b/test/test_helper.exs
new file mode 100644
index 0000000..869559e
--- /dev/null
+++ b/test/test_helper.exs
@@ -0,0 +1 @@
+ExUnit.start()