+
+int send_sb(struct stream_cipher_context *scc, void *buf, size_t numbytes,
+ int band, bool dont_free);
+__printf_3_4 int send_sb_va(struct stream_cipher_context *scc, int band,
+ const char *fmt, ...);
+int send_strerror(struct command_context *cc, int err);
+int recv_sb(struct stream_cipher_context *scc,
+ enum sb_designator expected_band,
+ size_t max_size, struct iovec *result);