diff --git a/lightningd/cryptomsg.c b/lightningd/cryptomsg.c
index a9a1cf77f..49986c2b1 100644
--- a/lightningd/cryptomsg.c
+++ b/lightningd/cryptomsg.c
@@ -9,6 +9,7 @@
 #include <sodium/crypto_aead_chacha20poly1305.h>
 #include <status.h>
 #include <utils.h>
+#include <wire/wire.h>
 #include <wire/wire_io.h>
 
 struct crypto_state {
@@ -320,3 +321,31 @@ struct crypto_state *crypto_state(struct peer *peer,
 
 	return cs;
 }
+
+void towire_crypto_state(u8 **ptr, const struct crypto_state *cs)
+{
+	towire_u64(ptr, cs->rn);
+	towire_u64(ptr, cs->sn);
+	towire_sha256(ptr, &cs->sk);
+	towire_sha256(ptr, &cs->rk);
+	towire_sha256(ptr, &cs->s_ck);
+	towire_sha256(ptr, &cs->r_ck);
+}
+
+struct crypto_state *fromwire_crypto_state(const tal_t *ctx,
+					   const u8 **ptr, size_t *max)
+{
+	struct crypto_state *cs = tal(ctx, struct crypto_state);
+
+	cs->rn = fromwire_u64(ptr, max);
+	cs->sn = fromwire_u64(ptr, max);
+	fromwire_sha256(ptr, max, &cs->sk);
+	fromwire_sha256(ptr, max, &cs->rk);
+	fromwire_sha256(ptr, max, &cs->s_ck);
+	fromwire_sha256(ptr, max, &cs->r_ck);
+	cs->peer = (struct peer *)ctx;
+
+	if (!*ptr)
+		return tal_free(cs);
+	return cs;
+}
diff --git a/lightningd/cryptomsg.h b/lightningd/cryptomsg.h
index 47ae10b59..9fbecf81c 100644
--- a/lightningd/cryptomsg.h
+++ b/lightningd/cryptomsg.h
@@ -2,6 +2,7 @@
 #define LIGHTNING_LIGHTNINGD_CRYPTOMSG_H
 #include "config.h"
 #include <ccan/short_types/short_types.h>
+#include <ccan/tal/tal.h>
 
 struct io_conn;
 struct peer;
@@ -29,4 +30,8 @@ struct io_plan *peer_write_message(struct io_conn *conn,
 				   struct io_plan *(*next)(struct io_conn *,
 							   struct peer *));
 
+void towire_crypto_state(u8 **pptr, const struct crypto_state *cs);
+struct crypto_state *fromwire_crypto_state(const tal_t *ctx,
+					   const u8 **ptr, size_t *max);
+
 #endif /* LIGHTNING_LIGHTNINGD_CRYPTOMSG_H */