new manual page BIO_dup_chain(3)

1 files changed, 12 insertions, 3 deletions

diff --git a/src/lib/libcrypto/man/BIO_f_md.3 b/src/lib/libcrypto/man/BIO_f_md.3
index d1519bb079..d98111f459 100644
--- a/src/lib/libcrypto/man/BIO_f_md.3
+++ b/src/lib/libcrypto/man/BIO_f_md.3
@@ -1,5 +1,5 @@
-.\"     $OpenBSD: BIO_f_md.3,v 1.11 2019/06/06 01:06:58 schwarze Exp $
-.\"     OpenSSL a528d4f0 Oct 27 13:40:11 2015 -0400
+.\" $OpenBSD: BIO_f_md.3,v 1.12 2022/12/18 19:35:36 schwarze Exp $
+.\" full merge up to: OpenSSL 99d63d46 Oct 26 13:56:48 2016 -0400
 .\"
 .\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
 .\" Copyright (c) 2000, 2006, 2009, 2016 The OpenSSL Project.
@@ -49,7 +49,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 .\" OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: June 6 2019 $
+.Dd $Mdocdate: December 18 2022 $
 .Dt BIO_F_MD 3
 .Os
 .Sh NAME
@@ -145,6 +145,15 @@ is an internal context structure.
 Changes made to this context will affect the digest BIO itself, and
 the context pointer will become invalid when the digest BIO is freed.
 .Pp
+When a chain containing a message digest BIO is copied with
+.Xr BIO_dup_chain 3 ,
+.Xr EVP_MD_CTX_copy_ex 3
+is called internally to automatically copy the message digest context
+from the existing BIO object to the new one,
+and the init flag that can be retrieved with
+.Xr BIO_get_init 3
+is set to 1.
+.Pp
 After the digest has been retrieved from a digest BIO,
 it must be reinitialized by calling
 .Xr BIO_reset 3