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.\" $OpenBSD: EVP_CIPHER_do_all.3,v 1.3 2024/03/14 23:54:55 tb Exp $
.\"
.\" Copyright (c) 2023,2024 Theo Buehler <tb@openbsd.org>
.\" Copyright (c) 2021 Ingo Schwarze <schwarze@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: March 14 2024 $
.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 ,
.Nm OBJ_NAME_do_all ,
.Nm OBJ_NAME_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
.Bd -literal
typedef struct {
int type;
int alias;
const char *name;
const char *data;
} OBJ_NAME;
.Ed
.Pp
.Ft void
.Fo OBJ_NAME_do_all
.Fa "int type"
.Fa "void (*fn)(const OBJ_NAME *obj_name, void *arg)"
.Fa "void *arg"
.Fc
.Ft void
.Fo OBJ_NAME_do_all_sorted
.Fa "int type"
.Fa "void (*fn)(const OBJ_NAME *obj_name, 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 .
.Pp
.Vt OBJ_NAME
is an abstraction of the types underlying the lookup tables
for ciphers and their aliases, and digests and their aliases, respectively.
For a cipher,
.Fa type
is
.Dv OBJ_NAME_TYPE_CIPHER_METH ,
.Fa alias
is 0,
.Fa name
is its lookup name and
.Fa data
is the
.Vt EVP_CIPHER
object it represents, cast to
.Vt const char * .
For a cipher alias,
.Fa type
is
.Dv OBJ_NAME_TYPE_CIPHER_METH ,
.Fa alias
is
.Dv OBJ_NAME_ALIAS ,
.Fa name
is its lookup name and
.Fa data
is the name it aliases.
Digests representing an
.Vt EVP_MD
object and their aliases are represented similarly, except that their type is
.Dv OBJ_NAME_TYPE_MD_METH .
.Pp
.Fn OBJ_NAME_do_all
calls
.Fa fn
on every
.Fa obj_name
in the table that has the given
.Fa type
(either
.Dv OBJ_NAME_TYPE_CIPHER_METH
or
.Dv OBJ_NAME_TYPE_MD_METH ) ,
also passing the
.Fa arg
pointer.
.Fn OBJ_NAME_do_all_sorted
is similar except that it processes the
.Fa obj_name
in lexicographic order of their names as determined by
.Xr strcmp 3 .
.Sh SEE ALSO
.Xr evp 3 ,
.Xr EVP_get_cipherbyname 3 ,
.Xr EVP_get_digestbyname 3
.Sh HISTORY
These functions first appeared in OpenSSL 1.0.0 and have been available since
.Ox 4.9 .
.Sh CAVEATS
.Fn EVP_CIPHER_do_all_sorted ,
.Fn EVP_MD_do_all_sorted ,
and
.Fn OBJ_NAME_do_all_sorted
cannot report errors.
In some implementations they need to allocate internally and
if memory allocation fails they do nothing at all,
without telling the caller about the problem.
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