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diff --git a/web/server/h2o/libh2o/deps/picotls/deps/cifra/src/cf_config.h b/web/server/h2o/libh2o/deps/picotls/deps/cifra/src/cf_config.h
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+/*
+ * cifra - embedded cryptography library
+ * Written in 2014 by Joseph Birr-Pixton <jpixton@gmail.com>
+ *
+ * To the extent possible under law, the author(s) have dedicated all
+ * copyright and related and neighboring rights to this software to the
+ * public domain worldwide. This software is distributed without any
+ * warranty.
+ *
+ * You should have received a copy of the CC0 Public Domain Dedication
+ * along with this software. If not, see
+ * <http://creativecommons.org/publicdomain/zero/1.0/>.
+ */
+
+#ifndef CF_CONFIG_H
+#define CF_CONFIG_H
+
+/**
+ * Library configuration
+ * =====================
+ */
+
+/* .. c:macro:: CF_SIDE_CHANNEL_PROTECTION
+ * Define this as 1 if you need all available side channel protections.
+ * **This option may alter the ABI**.
+ *
+ * This has a non-trivial performance penalty.  Where a
+ * side-channel free option is cheap or free (like checking
+ * a MAC) this is always done in a side-channel free way.
+ *
+ * The default is **on** for all available protections.
+ */
+#ifndef CF_SIDE_CHANNEL_PROTECTION
+# define CF_SIDE_CHANNEL_PROTECTION 1
+#endif
+
+/* .. c:macro:: CF_TIME_SIDE_CHANNEL_PROTECTION
+ * Define this as 1 if you need timing/branch prediction side channel
+ * protection.
+ *
+ * You probably want this.  The default is on. */
+#ifndef CF_TIME_SIDE_CHANNEL_PROTECTION
+# define CF_TIME_SIDE_CHANNEL_PROTECTION CF_SIDE_CHANNEL_PROTECTION
+#endif
+
+/* .. c:macro:: CF_CACHE_SIDE_CHANNEL_PROTECTION
+ * Define this as 1 if you need cache side channel protection.
+ *
+ * If you have a microcontroller with no cache, you can turn this off
+ * without negative effects.
+ *
+ * The default is on.  This will have some performance impact,
+ * especially on AES.
+ */
+#ifndef CF_CACHE_SIDE_CHANNEL_PROTECTION
+# define CF_CACHE_SIDE_CHANNEL_PROTECTION CF_SIDE_CHANNEL_PROTECTION
+#endif
+
+#endif