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commit 5e9d6fcce64550f20e85a36323179e04f1b269d4 Author: Ian Jackson ijackson@chiark.greenend.org.uk AuthorDate: Tue Jan 17 13:06:08 2023 +0000
Introduce names for the principal relay keys --- tor-spec.txt | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-)
diff --git a/tor-spec.txt b/tor-spec.txt index d5305f2..d967a8e 100644 --- a/tor-spec.txt +++ b/tor-spec.txt @@ -230,14 +230,17 @@ see tor-design.pdf.
- A long-term signing-only "Identity key" used to sign documents and certificates, and used to establish relay identity. + KP_relayid_rsa, KS_relayid_rsa. - A medium-term TAP "Onion key" used to decrypt onion skins when accepting circuit extend attempts. (See 5.1.) Old keys MUST be accepted for a while after they are no longer advertised. Because of this, relays MUST retain old keys for a while after they're rotated. (See "onion key lifetime parameters" in dir-spec.txt.) + KP_onion_tap, KS_onion_tap. - A short-term "Connection key" used to negotiate TLS connections. Tor implementations MAY rotate this key as often as they like, and SHOULD rotate this key at least once a day. + KP_conn_tls, KS_conn_tls.
This is Curve25519 key:
@@ -247,23 +250,30 @@ see tor-design.pdf. longer advertised. Because of this, relays MUST retain old keys for a while after they're rotated. (See "onion key lifetime parameters" in dir-spec.txt.) + KP_onion_ntor, KS_onion_ntor.
These are Ed25519 keys:
- A long-term "master identity" key. This key never changes; it is used only to sign the "signing" key below. It may be kept offline. + KP_relayid_ntor, KS_relayid_ntor. - A medium-term "signing" key. This key is signed by the master identity key, and must be kept online. A new one should be generated periodically. It signs nearly everything else. + KP_relaysign_ntor, KS_relaysign_ntor. - A short-term "link authentication" key, used to authenticate the link handshake: see section 4 below. This key is signed by the "signing" key, and should be regenerated frequently. + KP_link_ntor, KS_link_ntor.
- The RSA identity key and Ed25519 master identity key together identify a - router uniquely. Once a router has used an Ed25519 master identity key - together with a given RSA identity key, neither of those keys may ever be - used with a different key. + KP_relayid_* together identify a router uniquely. Once a router + has used a KP_relayid_ntor (an Ed25519 master identity key) + together with a given KP_relayid_rsa (RSA identity key), neither of + those keys may ever be used with a different key. + + We write KP_relayid to refer to a key which is either + KP_relayid_rsa or KP_relayid_ntor.
2. Connections