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Diffstat (limited to 'tor-spec.txt')
| -rw-r--r-- | tor-spec.txt | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/tor-spec.txt b/tor-spec.txt index 6881436..fa6026d 100644 --- a/tor-spec.txt +++ b/tor-spec.txt @@ -1333,15 +1333,20 @@ see tor-design.pdf. When an onion router receives an EXTEND2 relay cell, it sends a CREATE2 cell to the next onion router, with the enclosed HLEN, HTYPE, and HDATA - as its payload. - - As special cases, if the EXTEND/EXTEND2 cell includes a legacy - identity, identity fingerprint, or Ed25519 identity of all zeroes, or - asks to extend back to the relay that sent the extend cell, the - circuit will fail and be torn down. The initiating onion router - chooses some circID not yet used on the connection between the two - onion routers. (But see section 5.1.1 above, concerning choosing - circIDs.) + as its payload. The initiating onion router chooses some circID not yet + used on the connection between the two onion routers. (But see section + 5.1.1 above, concerning choosing circIDs.) + + As special cases, if the EXTEND/EXTEND2 cell includes a legacy identity, or + identity fingerprint of all zeroes, or asks to extend back to the relay + that sent the extend cell, the circuit will fail and be torn down. + + Ed25519 identity keys are not required in EXTEND2 cells, so all zero + keys SHOULD be accepted. If the extending relay knows the ed25519 key from + the consensus, it SHOULD also check that key. (See section 5.1.2.) + + If an EXTEND2 cell contains the ed25519 key of the relay that sent the + extend cell, the circuit will fail and be torn down. When an onion router receives a CREATE/CREATE2 cell, if it already has a circuit on the given connection with the given circID, it drops the |