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65 lines
1.9 KiB
Plaintext
65 lines
1.9 KiB
Plaintext
Wire Protocol (version 0)
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The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
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"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
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document are to be interpreted as described in RFC 2119 [RFC2119].
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LLARP supports by default an authenticated and framed transport over UTP [1]
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1088 byte fragments are sent over UTP in an ordered fashion.
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The each fragment has the following structure:
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[ 32 bytes blake2 keyed hash of the following 1056 bytes ]
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[ 24 bytes random nonce ]
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[ 1032 bytes encrypted payload ]
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the decrypted payload has the following structure:
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[ big endian unsigned 32 bit flags (F) ]
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[ big endian unsigned 32 bit fragment length (N) ]
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[ N bytes of plaintext payload ]
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if F is non zero then more fragments for the current message being transmitted
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are expected. If F is zero then this fragment is the last in the sequence.
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On each fragment append the N bytes of payload to an internal buffer.
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This internal buffer MUST NOT exceed 8192 bytes, the maximum size of an inter
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node message.
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When the last fragment in the sequence is reached the internal buffer is
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processed as a link layer message (see proto_v0.txt)
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Handshake phase:
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Before data flows a protocol handshake must happen.
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The first message sent is a LIM (L) (see proto_v0.txt) by the connection initiator, Alice.
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The receiving end MUST verify the signatures of the LIM and RC.
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If any verification fails at any phase the underlying UTP session MUST be reset.
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Each side re-computes the session key.
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the session key kdf for K is:
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t_h = HS(K + L.n)
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K = TKE(A.p, B_a.e, sk, t_h)
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the initial value of K is HS(B.k)
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Periodically the connection initiator MUST renegotiate the session key by
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sending a LIM after L.p milliseconds have elapsed.
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If either party's RC changes while a connection is established they MUST
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renegotioate the session keys to ensure the new RC is sent.
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references:
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[1] http://www.bittorrent.org/beps/bep_0029.html
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