Index: sys/opencrypto/criov.c
===================================================================
--- sys/opencrypto/criov.c
+++ sys/opencrypto/criov.c
@@ -269,6 +269,13 @@
 	}
 }
 
+void
+crypto_cursor_copy(const struct crypto_buffer_cursor *fromc,
+    struct crypto_buffer_cursor *toc)
+{
+	memcpy(toc, fromc, sizeof(struct crypto_buffer_cursor));
+}
+
 SDT_PROBE_DEFINE2(opencrypto, criov, cursor_advance, vmpage, "struct crypto_buffer_cursor*", "size_t");
 
 void
Index: sys/opencrypto/cryptodev.h
===================================================================
--- sys/opencrypto/cryptodev.h
+++ sys/opencrypto/cryptodev.h
@@ -698,6 +698,8 @@
 size_t	crypto_buffer_len(struct crypto_buffer *cb);
 void	crypto_cursor_init(struct crypto_buffer_cursor *cc,
 	    const struct crypto_buffer *cb);
+void	crypto_cursor_copy(const struct crypto_buffer_cursor *fromc,
+	    struct crypto_buffer_cursor *toc);
 void	crypto_cursor_advance(struct crypto_buffer_cursor *cc, size_t amount);
 void	*crypto_cursor_segbase(struct crypto_buffer_cursor *cc);
 size_t	crypto_cursor_seglen(struct crypto_buffer_cursor *cc);