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diff --git a/src/trunnel/hs/cell_rendezvous.trunnel b/src/trunnel/hs/cell_rendezvous.trunnel
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+/*
+ * This contains the definition of the RENDEZVOUS1 cell for onion service
+ * version 3 and onward. The following format is specified in proposal 224
+ * section 4.2.
+ */
+
+/* Rendezvous cookie length. */
+const TRUNNEL_REND_COOKIE_LEN = 20;
+
+/* RENDEZVOUS1 payload. See details in section 4.2. */
+struct trn_cell_rendezvous1 {
+ /* The RENDEZVOUS_COOKIE field. */
+ u8 rendezvous_cookie[TRUNNEL_REND_COOKIE_LEN];
+
+ /* The HANDSHAKE_INFO field which has a variable length depending on the
+ * handshake type used. */
+ u8 handshake_info[];
+};