Allow using `server-auth-key' to set a permanent shared key

* server.el (server-auth-key): New variable.
(server-generate-key): New function.
(server-get-auth-key): New function.
(server-start): Use the new variable and functions to allow
setting a permanent server key.

Fixes: debbugs:9423

1 files changed, 4 insertions, 1 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 4ec33eae625..186dca19495 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -53,8 +53,11 @@ character when doing minibuffer filename prompts.
 ** which-function-mode now applies to all applicable major modes by default.
 
 ** erc will look up server/channel names via auth-source and use the
-   channel keys found, if any.
+channel keys found, if any.
 
+** The `server-auth-key' variable can be used to set a permanent
+shared key for Emacs Server.
+   
 ** Obsolete packages:
 
 *** mailpost.el