1 files changed, 26 insertions, 0 deletions

diff --git a/src/cadet/gnunet-service-cadet_connection.h b/src/cadet/gnunet-service-cadet_connection.h
index b05c3b72c..ed0e909fb 100644
--- a/src/cadet/gnunet-service-cadet_connection.h
+++ b/src/cadet/gnunet-service-cadet_connection.h
@@ -183,6 +183,32 @@ GCC_handle_kx_auth (struct CadetConnection *cc,
                     const struct
                     GNUNET_CADET_TunnelKeyExchangeAuthMessage *msg);
 
+/**
+ * Purpose for the signature of a monotime.
+ */
+struct CadetConnectionCreatePS
+{
+
+  /**
+   * Purpose is #GNUNET_SIGNATURE_PURPOSE_CADET_CONNECTION_INITIATOR
+   */
+  struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
+
+  /**
+   * Time at the initiator when generating the signature.
+   *
+   * Note that the receiver MUST IGNORE the absolute time, and only interpret
+   * the value as a mononic time and reject "older" values than the last one
+   * observed.  This is necessary as we do not want to require synchronized
+   * clocks and may not have a bidirectional communication channel.
+   *
+   * Even with this, there is no real guarantee against replay achieved here,
+   * unless the latest timestamp is persisted.  Persistence should be
+   * provided via PEERSTORE if possible.
+   */
+  struct GNUNET_TIME_AbsoluteNBO monotonic_time;
+
+};
 
 /**
  * Performance metrics for a connection.