From 88795c52ff13203dda5940ed5defc26ce2c20e5e Mon Sep 17 00:00:00 2001
From: Lars Ingebrigtsen <larsi@gnus.org>
Date: Mon, 24 Aug 2020 16:44:24 +0200
Subject: [PATCH] Have gnutls_symmetric cache the results from Fgnutls_ciphers
* src/gnutls.c (gnutls_symmetric): Cache the results from
Fgnutls_ciphers, since that function isn't very fast (bug#42998).
(syms_of_gnutls): Initialize cache variable.
---
src/gnutls.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/src/gnutls.c b/src/gnutls.c
index 416fb154701..0010553a9d4 100644
--- a/src/gnutls.c
+++ b/src/gnutls.c
@@ -2298,6 +2298,8 @@ gnutls_symmetric_aead (bool encrypting, gnutls_cipher_algorithm_t gca,
# endif
}
+static Lisp_Object cipher_cache;
+
static Lisp_Object
gnutls_symmetric (bool encrypting, Lisp_Object cipher,
Lisp_Object key, Lisp_Object iv,
@@ -2329,7 +2331,9 @@ gnutls_symmetric (bool encrypting, Lisp_Object cipher,
if (SYMBOLP (cipher))
{
- info = Fassq (cipher, Fgnutls_ciphers ());
+ if (NILP (cipher_cache))
+ cipher_cache = Fgnutls_ciphers ();
+ info = Fassq (cipher, cipher_cache);
if (!CONSP (info))
xsignal2 (Qerror,
build_string ("GnuTLS cipher is invalid or not found"),
@@ -2914,6 +2918,9 @@ level in the ones. For builds without libgnutls, the value is -1. */);
defsubr (&Sgnutls_hash_digest);
defsubr (&Sgnutls_symmetric_encrypt);
defsubr (&Sgnutls_symmetric_decrypt);
+
+ cipher_cache = Qnil;
+ staticpro (&cipher_cache);
#endif
DEFVAR_INT ("gnutls-log-level", global_gnutls_log_level,
--
2.39.5