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	diff --git a/share/man/man9/crypto_buffer.9 b/share/man/man9/crypto_buffer.9
	--- a/share/man/man9/crypto_buffer.9
	+++ b/share/man/man9/crypto_buffer.9
	@@ -30,7 +30,7 @@
	.\"
	.\" $FreeBSD$
	.\"
	-.Dd June 16, 2021
	+.Dd Feburary 11, 2022
	.Dt CRYPTO_BUFFER 9
	.Os
	.Sh NAME
	@@ -95,6 +95,11 @@
	.Fc
	.Ft void *
	.Fn crypto_cursor_segment "struct crypto_buffer_cursor cc" "size_t len"
	+.Ft void
	+.Fo crypto_cursor_copy
	+.Fa "const struct crypto_buffer_cursor *fromc"
	+.Fa "struct crypto_buffer_cursor *toc"
	+.Fc
	.Ft bool
	.Fn CRYPTO_HAS_OUTPUT_BUFFER "struct cryptop *crp"
	.Sh DESCRIPTION
	@@ -315,6 +320,12 @@
	.Fn crypto_cursor_seglen
	returns the length in bytes of a contiguous segment.
	.Pp
	+.Fn crypto_cursor_copy
	+makes a deep copy of the cursor
	+.Fa fromc .
	+The two copies do not share any state and can thus be used
	+independently.
	+.Pp
	.Fn CRYPTO_HAS_OUTPUT_BUFFER
	returns true if the request uses a separate output buffer.
	.Sh SEE ALSO
	diff --git a/sys/opencrypto/cryptodev.h b/sys/opencrypto/cryptodev.h
	--- a/sys/opencrypto/cryptodev.h
	+++ b/sys/opencrypto/cryptodev.h
	@@ -685,6 +685,13 @@
	void crypto_cursor_copydata_noadv(struct crypto_buffer_cursor *cc, int size,
	void *vdst);

	+static __inline void
	+crypto_cursor_copy(const struct crypto_buffer_cursor *fromc,
	+ struct crypto_buffer_cursor *toc)
	+{
	+ memcpy(toc, fromc, sizeof(*toc));
	+}
	+
	static __inline void
	crypto_read_iv(struct cryptop crp, void iv)
	{