Document EVP_{CIPHER,MD}_do_all{,_sorted}(3)

The function prototypes in the SYNOPSIS don't look great, but schwarze
assures me that this is how it is supposed to be. It is rather strange
that OpenSSL chose to sprinkle OPENSSL_init_crypto() calls into these
four functions rather than two inside OBJ_NAME_do_all{,_sorted}(3).
Surely there was a good reason for that.

With input and fixes from schwarze

3 files changed, 139 insertions, 3 deletions

diff --git a/src/lib/libcrypto/man/EVP_CIPHER_do_all.3 b/src/lib/libcrypto/man/EVP_CIPHER_do_all.3
new file mode 100644
index 0000000000..1d43d503de
--- /dev/null
+++ b/src/lib/libcrypto/man/EVP_CIPHER_do_all.3
@@ -0,0 +1,134 @@
+.\" $OpenBSD: EVP_CIPHER_do_all.3,v 1.1 2023/08/30 00:58:57 tb Exp $
+.\"
+.\" Copyright (c) 2023 Theo Buehler <tb@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd $Mdocdate: August 30 2023 $
+.Dt EVP_CIPHER_DO_ALL 3
+.Os
+.Sh NAME
+.Nm EVP_CIPHER_do_all ,
+.Nm EVP_CIPHER_do_all_sorted ,
+.Nm EVP_MD_do_all ,
+.Nm EVP_MD_do_all_sorted
+.Nd iterate over lookup tables for ciphers and digests
+.Sh SYNOPSIS
+.In openssl/evp.h
+.Ft void
+.Fo EVP_CIPHER_do_all
+.Fa "void (*fn)(const EVP_CIPHER *cipher, const char *from,\
+ const char *to, void *arg)"
+.Fa "void *arg"
+.Fc
+.Ft void
+.Fo EVP_CIPHER_do_all_sorted
+.Fa "void (*fn)(const EVP_CIPHER *cipher, const char *from,\
+ const char *to, void *arg)"
+.Fa "void *arg"
+.Fc
+.Ft void
+.Fo EVP_MD_do_all
+.Fa "void (*fn)(const EVP_MD *md, const char *from,\
+ const char *to, void *arg)"
+.Fa "void *arg"
+.Fc
+.Ft void
+.Fo EVP_MD_do_all_sorted
+.Fa "void (*fn)(const EVP_MD *md, const char *from,\
+ const char *to, void *arg)"
+.Fa "void *arg"
+.Fc
+.Sh DESCRIPTION
+.Fn EVP_CIPHER_do_all
+calls
+.Fa fn
+on every entry of the global table of cipher names and aliases.
+For a cipher name entry,
+.Fa fn
+is called with a non-NULL
+.Fa cipher ,
+its non-NULL cipher name
+.Fa from ,
+a NULL
+.Fa to ,
+and the
+.Fa arg
+pointer.
+For an alias entry,
+.Fa fn
+is called with a NULL
+.Fa cipher ,
+its alias
+.Fa from ,
+the cipher name that alias points
+.Fa to ,
+and the
+.Fa arg
+pointer.
+.Pp
+.Fn EVP_CIPHER_do_all_sorted
+is similar, except that it processes the cipher names and aliases
+in lexicographic order of their
+.Fa from
+names as determined by
+.Xr strcmp 3 .
+.Pp
+.Fn EVP_MD_do_all
+calls
+.Fa fn
+on every entry of the global table of digest names and aliases.
+For a digest name entry,
+.Fa fn
+is called with a non-NULL
+.Fa md ,
+its non-NULL digest name
+.Fa from ,
+a NULL
+.Fa to ,
+and the
+.Fa arg
+pointer.
+For an alias entry,
+.Fa fn
+is called with a NULL
+.Fa md ,
+its alias
+.Fa from ,
+the digest name that alias points
+.Fa to ,
+and the
+.Fa arg
+pointer.
+.Pp
+.Fn EVP_MD_do_all_sorted
+is similar, except that it processes the digest names and aliases
+in lexicographic order of their
+.Fa from
+names as determined by
+.Xr strcmp 3 .
+.Sh SEE ALSO
+.Xr evp 3 ,
+.Xr EVP_add_cipher 3 ,
+.Xr OBJ_NAME_do_all 3
+.Sh HISTORY
+These functions first appeared in OpenSSL 1.0.0 and have been available since
+.Ox 4.9 .
+.Sh BUGS
+.Fn EVP_CIPHER_do_all_sorted
+and
+.Fn EVP_MD_do_all_sorted
+are wrappers of
+.Xr OBJ_NAME_do_all_sorted 3 .
+In particular, if memory allocation fails, they do nothing at all
+without telling the caller about the problem.
diff --git a/src/lib/libcrypto/man/Makefile b/src/lib/libcrypto/man/Makefile
index 2c243f7fec..4052638e0e 100644
--- a/src/lib/libcrypto/man/Makefile
+++ b/src/lib/libcrypto/man/Makefile
@@ -1,4 +1,4 @@
-# $OpenBSD: Makefile,v 1.264 2023/08/27 15:33:08 schwarze Exp $
+# $OpenBSD: Makefile,v 1.265 2023/08/30 00:58:57 tb Exp $
 
 .include <bsd.own.mk>
 
@@ -165,6 +165,7 @@ MAN=	\
         EVP_AEAD_CTX_init.3 \
         EVP_BytesToKey.3 \
         EVP_CIPHER_CTX_get_cipher_data.3 \
+        EVP_CIPHER_do_all.3 \
         EVP_CIPHER_meth_new.3 \
         EVP_DigestInit.3 \
         EVP_DigestSignInit.3 \
diff --git a/src/lib/libcrypto/man/evp.3 b/src/lib/libcrypto/man/evp.3
index d53fa94fe1..3b93d8ba64 100644
--- a/src/lib/libcrypto/man/evp.3
+++ b/src/lib/libcrypto/man/evp.3
@@ -1,4 +1,4 @@
-.\" $OpenBSD: evp.3,v 1.20 2023/08/27 15:33:08 schwarze Exp $
+.\" $OpenBSD: evp.3,v 1.21 2023/08/30 00:58:57 tb Exp $
 .\" full merge up to: OpenSSL man7/evp 24a535ea Sep 22 13:14:20 2020 +0100
 .\"
 .\" This file was written by Ulf Moeller <ulf@openssl.org>,
@@ -51,7 +51,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 .\" OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: August 27 2023 $
+.Dd $Mdocdate: August 30 2023 $
 .Dt EVP 3
 .Os
 .Sh NAME
@@ -200,6 +200,7 @@ operations are more efficient using the high-level interfaces.
 .Xr EVP_camellia_128_cbc 3 ,
 .Xr EVP_chacha20 3 ,
 .Xr EVP_CIPHER_CTX_get_cipher_data 3 ,
+.Xr EVP_CIPHER_do_all 3 ,
 .Xr EVP_CIPHER_meth_new 3 ,
 .Xr EVP_des_cbc 3 ,
 .Xr EVP_DigestInit 3 ,