document EVP_PKEY_CTRL_SET_MAC_KEY for CMAC

1 files changed, 16 insertions, 2 deletions

diff --git a/src/lib/libcrypto/man/EVP_PKEY_CTX_ctrl.3 b/src/lib/libcrypto/man/EVP_PKEY_CTX_ctrl.3
index 075ee19f46..9049a11832 100644
--- a/src/lib/libcrypto/man/EVP_PKEY_CTX_ctrl.3
+++ b/src/lib/libcrypto/man/EVP_PKEY_CTX_ctrl.3
@@ -1,4 +1,4 @@
-.\" $OpenBSD: EVP_PKEY_CTX_ctrl.3,v 1.24 2024/11/06 18:58:01 schwarze Exp $
+.\" $OpenBSD: EVP_PKEY_CTX_ctrl.3,v 1.25 2024/11/07 17:33:42 schwarze Exp $
 .\" full merge up to: OpenSSL 99d63d46 Oct 26 13:56:48 2016 -0400
 .\" selective merge up to: OpenSSL 24a535ea Sep 22 13:14:20 2020 +0100
 .\" Parts were split out into RSA_pkey_ctx_ctrl(3).
@@ -69,7 +69,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 .\" OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: November 6 2024 $
+.Dd $Mdocdate: November 7 2024 $
 .Dt EVP_PKEY_CTX_CTRL 3
 .Os
 .Sh NAME
@@ -441,6 +441,20 @@ object, which can be obtained from the functions in the CIPHER LISTING in
 The
 .Fa p1
 argument is ignored; passing 0 is recommended.
+.Pp
+After selecting the block cipher with
+.Dv EVP_PKEY_CTRL_CIPHER ,
+.Fn EVP_PKEY_CTX_ctrl
+can be called again with an
+.Fa optype
+of \-1, a
+.Fa cmd
+of
+.Dv EVP_PKEY_CTRL_SET_MAC_KEY ,
+.Fa p2
+pointing to the symmetric key, and
+.Fa p1
+specifying the length of the symmetric key in bytes.
 .Ss Other parameters
 The
 .Fn EVP_PKEY_CTX_set1_id ,