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diff --git a/src/or/crypt_path_st.h b/src/or/crypt_path_st.h
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+/* Copyright (c) 2001 Matej Pfajfar.
+ * Copyright (c) 2001-2004, Roger Dingledine.
+ * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
+ * Copyright (c) 2007-2018, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+#ifndef CRYPT_PATH_ST_H
+#define CRYPT_PATH_ST_H
+
+#include "relay_crypto_st.h"
+
+/** Holds accounting information for a single step in the layered encryption
+ * performed by a circuit.  Used only at the client edge of a circuit. */
+struct crypt_path_t {
+  uint32_t magic;
+
+  /** Cryptographic state used for encrypting and authenticating relay
+   * cells to and from this hop. */
+  relay_crypto_t crypto;
+
+  /** Current state of the handshake as performed with the OR at this
+   * step. */
+  onion_handshake_state_t handshake_state;
+  /** Diffie-hellman handshake state for performing an introduction
+   * operations */
+  crypto_dh_t *rend_dh_handshake_state;
+
+  /** Negotiated key material shared with the OR at this step. */
+  char rend_circ_nonce[DIGEST_LEN];/* KH in tor-spec.txt */
+
+  /** Information to extend to the OR at this step. */
+  extend_info_t *extend_info;
+
+  /** Is the circuit built to this step?  Must be one of:
+   *    - CPATH_STATE_CLOSED (The circuit has not been extended to this step)
+   *    - CPATH_STATE_AWAITING_KEYS (We have sent an EXTEND/CREATE to this step
+   *      and not received an EXTENDED/CREATED)
+   *    - CPATH_STATE_OPEN (The circuit has been extended to this step) */
+  uint8_t state;
+#define CPATH_STATE_CLOSED 0
+#define CPATH_STATE_AWAITING_KEYS 1
+#define CPATH_STATE_OPEN 2
+  struct crypt_path_t *next; /**< Link to next crypt_path_t in the circuit.
+                              * (The list is circular, so the last node
+                              * links to the first.) */
+  struct crypt_path_t *prev; /**< Link to previous crypt_path_t in the
+                              * circuit. */
+
+  int package_window; /**< How many cells are we allowed to originate ending
+                       * at this step? */
+  int deliver_window; /**< How many cells are we willing to deliver originating
+                       * at this step? */
+};
+
+#endif
+