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-rw-r--r--src/or/relay_crypto.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/or/relay_crypto.c b/src/or/relay_crypto.c
index 9d61ecd424..c42a4f9cca 100644
--- a/src/or/relay_crypto.c
+++ b/src/or/relay_crypto.c
@@ -170,6 +170,9 @@ relay_decrypt_cell(circuit_t *circ, cell_t *cell,
/**
* Encrypt a cell <b>cell</b> that we are creating, and sending outbound on
* <b>circ</b> until the hop corresponding to <b>layer_hint</b>.
+ *
+ * The integrity field and recognized field of <b>cell</b>'s relay headers
+ * must be set to zero.
*/
void
relay_encrypt_cell_outbound(cell_t *cell,
@@ -193,6 +196,9 @@ relay_encrypt_cell_outbound(cell_t *cell,
/**
* Encrypt a cell <b>cell</b> that we are creating, and sending on
* <b>circuit</b> to the origin.
+ *
+ * The integrity field and recognized field of <b>cell</b>'s relay headers
+ * must be set to zero.
*/
void
relay_encrypt_cell_inbound(cell_t *cell,