# PASExTO

[![Hex.pm](https://img.shields.io/hexpm/v/pasexto.svg)](https://hex.pm/packages/pasexto) [![Documentation](https://img.shields.io/badge/documentation-gray)](https://hexdocs.pm/pasexto/)

A compliant and complete implementation of [PASETO](https://github.com/paseto-standard/paseto-rfc) and [PASERK](https://github.com/paseto-standard/paserk).


## Requirements

This library makes use of OTP's `:crypto` module where applicable, and fills in any gaps using Zig's standard library.
As a result, Zig's build tools are required in order to use this library.


## Installation

Add `:pasexto` to the list of dependencies in `mix.exs`:

```elixir
def deps do
  [
    {:pasexto, "~> 0.1.0"}
  ]
end
```


## Usage

Below are some examples of how to use this library:

```elixir
# Building and parsing a local token
key = Pasexto.Key.new(:v4, :local)
claims = %{"hello" => "world"}
footer = <<>>
{:ok, paseto, claims} = Pasexto.build(:v4, :local, key, claims, footer)
{:ok, ^claims, ^footer} = Pasexto.parse(:v4, :local, key, paseto)

# Building and parsing a public token
key = Pasexto.Key.new(:v4, :public)
claims = %{"hello" => "world"}
footer = <<>>
{:ok, paseto, claims} = Pasexto.build(:v4, :public, key, claims, footer)
{:ok, ^claims, ^footer} = Pasexto.parse(:v4, :public, key, paseto)

# Using a keyring
key = Pasexto.Key.new(:v4, :local)
keyring = Pasexto.Keyring.new(:v4, :local) |> Pasexto.Keyring.put("key1", key)
claims = %{"hello" => "world"}
footer = %{"kid" => "key1"}
{:ok, paseto, claims} = Pasexto.build(:v4, :local, keyring, claims, footer)
{:ok, ^claims, ^footer} = Pasexto.parse(:v4, :local, keyring, paseto)

# Using PASERK
key = Pasexto.Key.new(:v4, :local)
{:ok, kid} = Pasexto.Paserk.build(:k4, :lid, key)
keyring = Pasexto.Keyring.new(:v4, :local) |> Pasexto.Keyring.put(kid, key)
claims = %{"hello" => "world"}
footer = %{"kid" => kid}
{:ok, paseto, claims} = Pasexto.build(:v4, :local, keyring, claims, footer)
{:ok, ^claims, ^footer} = Pasexto.parse(:v4, :local, keyring, paseto)
```


## Running Tests

Clone the repo and fetch its dependencies:

```bash
$ git clone https://github.com/alexkornitzer/pasexto.git
$ cd pasexto
$ mix deps.get
$ mix test
```