toxcore/docs/Group-Chats.md
2013-09-22 14:15:09 -07:00

2.2 KiB

Massive public group chats.

Everyone generates a short term public private key pair right before joining the chat.

Note that for public group chats it is impossible to protect the chat from being spied on by a very dedicated attacker, encryption is therefor used as a form of spam/access control.

Joining the chats

Protocol

Node format:

[char array (node_id), length=32 bytes][ip (in network byte order), length=4 bytes][port (in network byte order), length=2 bytes][Padding , length=2 bytes]

Get nodes (Request): Packet contents:

[char with a value of 48][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 with the nonce and private key of the sender:[char with a value of 48][random 8 byte (ping_id)]

Valid replies: a send_nodes packet

Send_nodes (response):

[char with a value of 48][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 with the nonce and private key of the sender:[char with a value of 49][random 8 byte (ping_id)][Nodes in node format, length=40 * (number of nodes (maximum of 6 nodes)) bytes]]

Broadcast packet:

[char with a value of 48][Bob's (The reciever's) Public key (client_id) (32 bytes))][Alice's (The sender's) Public key (client_id) (32 bytes)][nonce][Encrypted with the nonce and private key of the sender:[char with a value of 50][Data to send to everyone]]

Data to send to everyone: TODO: signing and spam control + permissions. [client_id of sender][uint32_t message number][char with a value representing id of message][data]

Note: the message number is increased by 1 for each sent message.

message ids: 0 - ping sent every ~60 seconds by every peer. No data.

16 - new_peer Tell everyone about a new peer in the chat. [uint8_t public_key[public_key_len]]

17 - ban_peer Ban a peer [uint8_t public_key[public_key_len]]

18 - topic change [uint8_t topic[topiclen]]

48 - name change [uint8_t name[namelen]]

49 - status change [uint8_t (status id)]

64 - chat message [uint8_t message[messagelen]]

65 - action (/me) [uint8_t message[messagelen]]