1 files changed, 19 insertions, 0 deletions
diff --git a/src/trunnel/sendme_cell.trunnel b/src/trunnel/sendme_cell.trunnel
new file mode 100644
index 0000000000..300963e679
--- /dev/null
+++ b/src/trunnel/sendme_cell.trunnel
@@ -0,0 +1,19 @@
+/* This file contains the SENDME cell definition. */
+
+/* v1 digest length in bytes. */
+const TRUNNEL_SENDME_V1_DIGEST_LEN = 20;
+
+/* SENDME cell declaration. */
+struct sendme_cell {
+  /* Version field. */
+  u8 version IN [0x00, 0x01];
+
+  /* Length of data contained in this cell. */
+  u16 data_len;
+
+  /* The data content depends on the version. */
+  union data[version] with length data_len {
+    0x00: ignore;
+    0x01: u8 v1_digest[TRUNNEL_SENDME_V1_DIGEST_LEN];
+  };
+}