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71 lines
2.2 KiB
Markdown
71 lines
2.2 KiB
Markdown
Massive public group chats.
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Everyone generates a short term public private key pair right before joining
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the chat.
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Note that for public group chats it is impossible to protect the chat from
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being spied on by a very dedicated attacker, encryption is therefor used as a
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form of spam/access control.
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## Joining the chats
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## Protocol
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Node format:
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```
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[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]
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```
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Get nodes (Request):
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Packet contents:
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```
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[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)]
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```
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Valid replies: a send_nodes packet
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Send_nodes (response):
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```
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[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]]
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```
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Broadcast packet:
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```
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[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]]
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```
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Data to send to everyone:
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TODO: signing and spam control + permissions.
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[client_id of sender][uint32_t message number][char with a value representing id of message][data]
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Note: the message number is increased by 1 for each sent message.
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message ids:
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0 - ping
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sent every ~60 seconds by every peer.
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No data.
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16 - new_peer
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Tell everyone about a new peer in the chat.
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[uint8_t public_key[public_key_len]]
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17 - ban_peer
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Ban a peer
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[uint8_t public_key[public_key_len]]
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18 - topic change
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[uint8_t topic[topiclen]]
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48 - name change
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[uint8_t name[namelen]]
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49 - status change
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[uint8_t (status id)]
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64 - chat message
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[uint8_t message[messagelen]]
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65 - action (/me)
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[uint8_t message[messagelen]] |