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| author | Ian Jackson <ijackson@chiark.greenend.org.uk> | 2023-02-06 12:51:41 +0000 |
|---|---|---|
| committer | Ian Jackson <ijackson@chiark.greenend.org.uk> | 2023-02-06 12:51:41 +0000 |
| commit | 7b3d7a40a0ac8f59b9f6d79205dfc53de4168f0c (patch) | |
| tree | 2bb81bb15409fdeef59f23b51804b0d563f9a415 /rend-spec-v3.txt | |
| parent | 5c6b282e57f866a1341eb705cb21507fcbfcc543 (diff) | |
| download | torspec-7b3d7a40a0ac8f59b9f6d79205dfc53de4168f0c.tar.gz torspec-7b3d7a40a0ac8f59b9f6d79205dfc53de4168f0c.zip | |
Use proper names for KP_hsc_desc_enc
Diffstat (limited to 'rend-spec-v3.txt')
| -rw-r--r-- | rend-spec-v3.txt | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/rend-spec-v3.txt b/rend-spec-v3.txt index afc2a46..805e0d9 100644 --- a/rend-spec-v3.txt +++ b/rend-spec-v3.txt @@ -1231,19 +1231,17 @@ Table of contents: When client authorization is enabled, each "auth-client" line contains the descriptor cookie encrypted to each individual client. We assume that - each authorized client possesses a pre-shared x25519 keypair which is - used to decrypt the descriptor cookie. + each authorized client possesses a pre-shared x25519 keypair + KS/KP_hsc_desc_enc which is used to decrypt the descriptor cookie. We now describe the descriptor cookie encryption scheme. Here are the relevant keys: - client_x = private x25519 key of authorized client - client_X = public x25519 key of authorized client descriptor_cookie = descriptor cookie used to encrypt the descriptor And here is what the hidden service computes: - SECRET_SEED = x25519(KS_hs_desc_ephem, client_X) + SECRET_SEED = x25519(KS_hs_desc_ephem, KP_hsc_desc_enc) KEYS = KDF(N_hs_subcred | SECRET_SEED, 40) CLIENT-ID = fist 8 bytes of KEYS COOKIE-KEY = last 32 bytes of KEYS |