+
+/* Fills buffer (up to buflen) with shared secret. The rempublic string
+ * comes from the remote site, and may not be acceptable, though it has been
+ * checked for memory-safety. The secretlen and buflen are the secret_len
+ * and shared_len reported by the closure, respectively. Return false on
+ * faliure (e.g., if the publiclen is unacceptable).
+ */