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+.\" $OpenBSD: OpenSSL_add_all_algorithms.3,v 1.19 2025/06/12 15:59:30 schwarze Exp $
+.\" full merge up to: OpenSSL b3696a55 Sep 2 09:35:50 2017 -0400
+.\"
+.\" This file is a derived work.
+.\" The changes are covered by the following Copyright and license:
+.\"
+.\" Copyright (c) 2018, 2019, 2023, 2025 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.
+.\"
+.\" The original file was written by Dr. Stephen Henson <steve@openssl.org>.
+.\" Copyright (c) 2000, 2003, 2013 The OpenSSL Project. All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\"
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\"
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in
+.\" the documentation and/or other materials provided with the
+.\" distribution.
+.\"
+.\" 3. All advertising materials mentioning features or use of this
+.\" software must display the following acknowledgment:
+.\" "This product includes software developed by the OpenSSL Project
+.\" for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+.\"
+.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+.\" endorse or promote products derived from this software without
+.\" prior written permission. For written permission, please contact
+.\" openssl-core@openssl.org.
+.\"
+.\" 5. Products derived from this software may not be called "OpenSSL"
+.\" nor may "OpenSSL" appear in their names without prior written
+.\" permission of the OpenSSL Project.
+.\"
+.\" 6. Redistributions of any form whatsoever must retain the following
+.\" acknowledgment:
+.\" "This product includes software developed by the OpenSSL Project
+.\" for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
+.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+.\" OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd $Mdocdate: June 12 2025 $
+.Dt OPENSSL_ADD_ALL_ALGORITHMS 3
+.Os
+.Sh NAME
+.Nm OpenSSL_add_all_algorithms ,
+.Nm OpenSSL_add_all_ciphers ,
+.Nm OpenSSL_add_all_digests ,
+.Nm EVP_cleanup ,
+.Nm SSLeay_add_all_algorithms
+.\" .Nm OPENSSL_add_all_algorithms_conf ,
+.\" .Nm OPENSSL_add_all_algorithms_noconf ,
+.\" .Nm SSLeay_add_all_ciphers , and
+.\" .Nm SSLeay_add_all_digests are intentionally undocumented
+.\" because they are unused aliases.
+.Nd add algorithms to internal table
+.Sh SYNOPSIS
+.Lb libcrypto
+.In openssl/evp.h
+.Ft void
+.Fn OpenSSL_add_all_algorithms void
+.Ft void
+.Fn OpenSSL_add_all_ciphers void
+.Ft void
+.Fn OpenSSL_add_all_digests void
+.Ft void
+.Fn EVP_cleanup void
+.Ft void
+.Fn SSLeay_add_all_algorithms void
+.Sh DESCRIPTION
+These functions are deprecated.
+It is never useful for any application program
+to call any of them explicitly.
+Most of them have no effect except that they may or may not call
+.Xr OPENSSL_init_crypto 3 .
+.Pp
+The library contains internal tables of digest algorithms and ciphers.
+It uses these tables to look up digests and ciphers via
+.Xr EVP_get_digestbyname 3
+and
+.Xr EVP_get_cipherbyname 3 ,
+respectively.
+In LibreSSL, these tables are static constants and do not require
+initialization.
+.Pp
+.Fn OpenSSL_add_all_algorithms
+used to add all digests and ciphers to the tables.
+If an application is compiled with the preprocessor symbol
+.Dv OPENSSL_LOAD_CONF
+defined, it also calls
+.Xr OPENSSL_config 3
+with a
+.Dv NULL
+argument, loading the default configuration file.
+Relying on this behaviour is not recommended.
+If loading a configuration file is desired, call
+.Xr OPENSSL_config 3
+or
+.Xr CONF_modules_load_file 3
+directly.
+.Pp
+.Fn OpenSSL_add_all_digests
+used to add all digest algorithms to the table.
+.Pp
+.Fn OpenSSL_add_all_ciphers
+used to add all encryption algorithms to the table.
+.Pp
+.Fn EVP_cleanup
+has no effect; it used to remove various kinds of application-supplied
+data that is no longer supported in the first place.
+.Pp
+.Fn SSLeay_add_all_algorithms
+is a deprecated alias for
+.Fn OpenSSL_add_all_algorithms .
+.Pp
+.Fn OpenSSL_add_all_algorithms
+and
+.Fn SSLeay_add_all_algorithms
+are implemented as macros.
+.Sh SEE ALSO
+.Xr evp 3 ,
+.Xr EVP_DigestInit 3 ,
+.Xr EVP_EncryptInit 3 ,
+.Xr OPENSSL_config 3
+.Sh HISTORY
+.Fn EVP_cleanup ,
+.Fn SSLeay_add_all_algorithms ,
+and precursor functions
+.Fn SSLeay_add_all_ciphers
+and
+.Fn SSLeay_add_all_digests
+first appeared in SSLeay 0.8.0 and have been available since
+.Ox 2.4 .
+.Pp
+.Fn OpenSSL_add_all_algorithms ,
+.Fn OpenSSL_add_all_ciphers ,
+and
+.Fn OpenSSL_add_all_digests
+first appeared in OpenSSL 0.9.5 and have been available since
+.Ox 2.7 .
+.Sh BUGS
+Although the functions do not return error codes, it is possible for them
+to fail.