Index: sys/opencrypto/cryptodev.h
===================================================================
--- sys/opencrypto/cryptodev.h
+++ sys/opencrypto/cryptodev.h
@@ -431,6 +431,7 @@
 					 * if CRYPTO_F_ASYNC flags is set
 					 */
 #define	CRYPTO_F_IV_SEPARATE	0x0200	/* Use crp_iv[] as IV. */
+#define	CRYPTO_F_ESN		0x1000	/* Set when ESN field is provided */
 
 	int		crp_op;
 
@@ -443,6 +444,8 @@
 
 	int		crp_aad_start;	/* Location of AAD. */
 	int		crp_aad_length;	/* 0 => no AAD. */
+	uint8_t		crp_esn[4];	/* high-order ESN */
+
 	int		crp_iv_start;	/* Location of IV.  IV length is from
 					 * the session.
 					 */