89 lines
1.8 KiB
Protocol Buffer
89 lines
1.8 KiB
Protocol Buffer
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syntax = "proto3";
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message SignedPreKey {
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bytes signed_pre_key = 1;
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uint32 version = 2;
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uint32 protocol_version = 3;
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}
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// X3DH prekey bundle
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message Bundle {
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// Identity key
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bytes identity = 1;
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// Installation id
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map<string,SignedPreKey> signed_pre_keys = 2;
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// Prekey signature
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bytes signature = 4;
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// When the bundle was created locally
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int64 timestamp = 5;
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}
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message BundleContainer {
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reserved 3;
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// X3DH prekey bundle
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Bundle bundle = 1;
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// Private signed prekey
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bytes private_signed_pre_key = 2;
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}
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message DRHeader {
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// Current ratchet public key
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bytes key = 1;
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// Number of the message in the sending chain
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uint32 n = 2;
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// Length of the previous sending chain
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uint32 pn = 3;
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// Bundle ID
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bytes id = 4;
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}
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message DHHeader {
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// Compressed ephemeral public key
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bytes key = 1;
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}
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message X3DHHeader {
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reserved 3;
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// Ephemeral key used
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bytes key = 1;
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// Used bundle's signed prekey
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bytes id = 4;
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}
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// Hash Ratchet Header
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message HRHeader {
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// community key ID
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uint32 key_id = 1;
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// Community message number for this key_id
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uint32 seq_no = 2;
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// Community ID
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string group_id = 3;
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}
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// Direct message value
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message EncryptedMessageProtocol {
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X3DHHeader X3DH_header = 1;
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DRHeader DR_header = 2;
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DHHeader DH_header = 101;
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HRHeader HR_header = 102;
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// Encrypted payload
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bytes payload = 3;
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}
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// Top-level protocol message
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message ProtocolMessage {
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// The device id of the sender
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string installation_id = 2;
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// List of bundles
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repeated Bundle bundles = 3;
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// One to one message, encrypted, indexed by installation_id
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// TODO map here is redundant in case of community messages
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map<string,EncryptedMessageProtocol> encrypted_message = 101;
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// Public chats, not encrypted
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bytes public_message = 102;
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}
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