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Encryption library used: http://nacl.cr.yp.to/
When running the program for the first time the crypto_box_keypair() function is used to
generate the users public-private key pair. (32 bytes each)
The generated public key is set as the client_id of the peer.
Adding a friend
---------------
Alice adds bob to her friends list by adding his 32 byte public key (client_id) to her friends list.
2 cases:
case 1: Alice adds Bobs public key and bob waits for Alice to attempt to connect to him.
case 2: Bob and Alice add their respective public keys to their friends list at the same time.
case 1:
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Alice sends a onion data (see: Prevent_tracking.txt) packet to bob with the encrypted part containing the friends request like so:
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```
[char with a value of 32][nospam number (4 bytes)][Message]
```
Ex message: hello bob it's me alice -_- add me pl0x.
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For more info on the nospam see: Spam_Prevention.txt
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Bob receives the request and decrypts the message using the function crypto_box_open()
If the message decrypts successfully:
If Alice is already in Bobs friends list: case 2
If Alice is not in Bob's friends list and the nospam is good: Bob is prompt to add Alice and is shown the message from her.
If Bobs accepts Alice's friends request he adds her public key to his friends list.
case 2:
Bob and Alice both have the others public key in their friends list, they are ready for the next step: Connecting to an already added friend
In the next step only crypto_box() is used for encryption and only crypto_box_open() for decryption (just like in the last step.)
Connecting to an already added friend
-------------------------------------
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see: Tox_middle_level_network_protocol.txt
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Crypto request packets
--------------------------------------
```
[char with a value of 32][Bob's (The reciever's) Public key (client_id) (32 bytes))][Alice's (The sender's) Public key (client_id) (32 bytes)][Random nonce (24 bytes)][Encrypted message]
```
The encrypted message is encrypted with crypto_box() (using Bobs public key, Alice's private key and the nonce (randomly generated 24 bytes)) and is a message from Alice in which she tells Bob who she is.
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Each node can route the request to the receiver if they are connected to him. This is to bypass bad NATs.
