73 lines
2.3 KiB
Text
73 lines
2.3 KiB
Text
the Elixir version uses an ASN.1 based format, but the support in other
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languages (besides C) for ASN.1 is surprisingly bad.
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So I'll resort to a hard-coded format. Again.
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----
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InitMessage ::=
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capabilities:ShortList<u32(big-endian)>
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(* the InitMessage is the first thing sent on a newly established connection.
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* both sides are expected to send the capabilities they support
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* then wait for the other side to send theirs (meaning they don't
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* block each other during this), and then use just the capabilities
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* which both peers support *)
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ProtoMessage ::=
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algorithm:SigAlgo
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pubkeylen:u16(big-endian)
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length:u16(big-endian)
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data:[length]u8=ProtoMsgKind<pubkeylen>
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ProtoMsgKind<pubkeylen> ::=
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(* xfer *) [0x00] XferSlice<pubkeylen>
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| (* summary-pull *) [0x01] SummaryList<pubkeylen>
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| (* summary-ihave *) [0x02] SummaryList<pubkeylen>
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(* after the initial capabilities are sent, both sides are expected to send
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* summaries for all public keys they know + all available slices for these
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* pubkeys *)
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ShortList<T> ::= length:u16(big-endian) data:[length]T
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XSList<T> ::= length:u8 data:[length]T
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(* "raw" summary header overhead = 41 bytes, per 65535 slices *)
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SummaryList<pubkeylen> ::=
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data:[*]Slice<pubkeylen> (* uses all remaining space in the packet *)
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Slice<pubkeylen> ::=
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pubkey:[pubkeylen]u8
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start:u64
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length:u16
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XferSlice<pubkeylen> ::=
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pubkey:[pubkeylen]u8
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siglen:u16(big-endian)
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start:u64
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data:[*]XferBlob<siglen> (* uses all remaining space in the packet *)
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XferBlob<siglen> ::=
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signature:[siglen]u8 (* signature gets calculated over `blid ++ data` *)
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ttl:u8
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data:XferInner
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XferInner ::=
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(* normal *) [0x00] XferNormal
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| (* prune *) [0x01] (* empty; NOTE: this packet indicates that
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* all packets before it should be deleted on all servers;
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* used for data protection/privacy compliance;
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* although it is possible to delete such packets after a grace period
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* (e.g. 1 year) during which every peer should've had a chance to retrieve
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* it, doing that is discouraged *)
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XferNormal ::=
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attrs:ShortList<KeyValuePair>
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data:ShortList<u8>
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KeyValuePair ::=
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key:XSList<u8>
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value:ShortList<u8>
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SigAlgo ::=
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(* ed25519 *) [0x65, 0x64, 0xff, 0x13]
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