cwtch/protocol/group_message.proto

syntax = "proto2";
package protocol;

import "ControlChannel.proto";

message CwtchServerPacket {
       optional GroupMessage group_message = 1;
       optional FetchMessage fetch_message = 2;
}

extend protocol.ChannelResult {
    optional bytes server_nonce = 8200;      // 32 random bytes
}

message FetchMessage {
}

message GroupMessage {
        required bytes ciphertext = 1;
        required bytes spamguard = 2;
        required bytes signature = 3;
}

// DecryptedGroupMessage is *never* sent in the clear on the wire
// and is only ever sent when encrypted in the ciphertext parameter of
// GroupMessage
message DecryptedGroupMessage {
        required string onion = 1;
        required int32 timestamp = 2;
        required string text = 3;
        required bytes signed_group_id = 4;
        required bytes previous_message_sig =5;
        // Used to prevent analysis on text length, length is 1024 - len(text)
        required bytes padding = 6;
}