add libsodium recipe

[mathewvermeer]

This recipe was tested with the following app:

__version__ = "1.0.0"

import kivy
import libnacl
import time
import sys
from libnacl import public

kivy.require('1.9.0')

from kivy.app import App
from kivy.uix.label import Label
from kivy.logger import Logger

class MyApp(App):

    def build(self):
        # Asymmetric encryption example from libnacl/libsodium site
        msg = b'You\'ve got two empty halves of coconut and you\'re bangin\' \'em together.'

        bob = libnacl.public.SecretKey()
        alice = libnacl.public.SecretKey()

        bob_box = libnacl.public.Box(bob.sk, alice.pk)
        alice_box = libnacl.public.Box(alice.sk, bob.pk)

        bob_ctxt = bob_box.encrypt(msg)
        bclear = alice_box.decrypt(bob_ctxt)
        alice_ctxt = alice_box.encrypt(msg)
        aclear = alice_box.decrypt(alice_ctxt)
        return Label(text=aclear)

if __name__ == '__main__':
    MyApp().run()

If libsodium compiles and is copied correctly, the encryption code completes without error and the created label will be shown on the screen. The dependencies in the buildozer.spec file are kivy, libnacl, and libsodium.

[ghost]

@tito Can you have a look at this and comment if you want to see something changed? Thanks in advance.

[tito]

everything is ok, thanks for mentioning it :)