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.\" $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.
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