From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sat, 31 Jul 2021 21:54:23 +0000 (+0100)
Subject: document hmac algorithm
X-Git-Tag: hippotat/1.0.0~409
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ian/git?a=commitdiff_plain;h=a79c6bf7d3d3700bdf4e04b91b9384fa597c4201;p=hippotat.git

document hmac algorithm

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---

diff --git a/PROTOCOL b/PROTOCOL
index e18cf0e..1a385c3 100644
--- a/PROTOCOL
+++ b/PROTOCOL
@@ -29,7 +29,7 @@ Authentication token is:
         <time_t in hex with no leading 0s> <hmac in base64>
 (separated by a single space).  The hmac is
         HMAC(secret, <time_t in hex>)
-
+and the hash function is SHA256
 
 Possible future nonce-based authentication: