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-.\"     $OpenBSD: X509_ALGOR_dup.3,v 1.23 2024/03/19 17:34:05 tb Exp $
-.\"     OpenSSL 4692340e Jun 7 15:49:08 2016 -0400
-.\"
-.\" This file is a derived work.
-.\" The changes are covered by the following Copyright and license:
-.\"
-.\" Copyright (c) 2023 Theo Buehler <tb@openbsd.org>
-.\" Copyright (c) 2016 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) 2002, 2015 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: March 19 2024 $
-.Dt X509_ALGOR_DUP 3
-.Os
-.Sh NAME
-.Nm X509_ALGOR_new ,
-.Nm X509_ALGOR_free ,
-.Nm X509_ALGOR_dup ,
-.Nm X509_ALGOR_set0 ,
-.Nm X509_ALGOR_get0 ,
-.Nm X509_ALGOR_cmp
-.Nd create, change, and inspect algorithm identifiers
-.Sh SYNOPSIS
-.In openssl/x509.h
-.Ft X509_ALGOR *
-.Fn X509_ALGOR_new void
-.Ft void
-.Fn X509_ALGOR_free "X509_ALGOR *alg"
-.Ft X509_ALGOR *
-.Fo X509_ALGOR_dup
-.Fa "X509_ALGOR *alg"
-.Fc
-.Ft int
-.Fo X509_ALGOR_set0
-.Fa "X509_ALGOR *alg"
-.Fa "ASN1_OBJECT *aobj"
-.Fa "int ptype"
-.Fa "void *pval"
-.Fc
-.Ft void
-.Fo X509_ALGOR_get0
-.Fa "const ASN1_OBJECT **paobj"
-.Fa "int *pptype"
-.Fa "const void **ppval"
-.Fa "const X509_ALGOR *alg"
-.Fc
-.Ft int
-.Fo X509_ALGOR_cmp
-.Fa "const X509_ALGOR *a"
-.Fa "const X509_ALGOR *b"
-.Fc
-.Sh DESCRIPTION
-An
-.Vt X509_ALGOR
-object represents an ASN.1
-.Vt AlgorithmIdentifier
-structure defined in RFC 5280 section 4.1.1.2.
-It specifies a cryptographic
-.Fa algorithm
-by an ASN.1 object identifier (OID) that can be obtained from
-.Xr OBJ_nid2obj 3 ,
-together with optional algorithm-specific
-.Fa parameters
-of the type
-.Vt ASN1_TYPE ,
-see
-.Xr ASN1_TYPE_set 3 .
-.Vt X509_ALGOR
-objects are used by many other objects, for example certificates,
-certificate revocation lists, and certificate requests.
-.Pp
-.Fn X509_ALGOR_new
-allocates a new
-.Vt X509_ALGOR
-object containing the object that
-.Xr OBJ_nid2obj 3
-returns for
-.Dv NID_undef
-as the
-.Fa algorithm
-and a
-.Dv NULL
-pointer as the
-.Fa parameters .
-.Pp
-.Fn X509_ALGOR_free
-frees
-.Fa alg
-and any data contained in it.
-If
-.Fa alg
-is
-.Dv NULL ,
-no action occurs.
-.Pp
-.Fn X509_ALGOR_dup
-creates a deep copy of
-.Fa alg .
-It is implemented by calling
-.Xr ASN1_item_dup 3
-with arguments of
-.Dv X509_ALGOR_it
-and
-.Fa alg ,
-which is equivalent to calling
-.Xr i2d_X509_ALGOR 3
-and
-.Xr d2i_X509_ALGOR 3 .
-.Pp
-.Fn X509_ALGOR_set0
-sets the algorithm OID of
-.Fa alg
-to
-.Fa aobj
-and the associated parameter type to
-.Fa ptype
-with value
-.Fa pval .
-If
-.Fa ptype
-is
-.Dv V_ASN1_UNDEF ,
-the parameter is omitted and
-.Fa pval
-is ignored.
-If
-.Fa ptype
-is zero,
-.Fa pval
-is ignored and the existing parameter is left unchanged, or if
-.Fa alg
-does not contain a parameter, a new, empty parameter of type
-.Dv V_ASN1_UNDEF
-is added.
-Otherwise
-.Fa ptype
-and
-.Fa pval
-have the same meaning as the
-.Fa type
-and
-.Fa value
-parameters to
-.Xr ASN1_TYPE_set 3 .
-Ownership of
-.Fa aobj
-and, unless it is ignored, of
-.Fa pval
-is transferred to
-.Fa alg
-on success.
-.Pp
-.Fn X509_ALGOR_get0
-returns
-.Fa alg Ns 's
-algorithm OID in
-.Pf * Fa paobj ,
-its parameter type in
-.Pf * Fa pptype ,
-and its parameter value in
-.Pf * Fa ppval .
-Any of
-.Fa paobj ,
-.Fa pptype ,
-and
-.Fa ppval
-can be
-.Dv NULL .
-If
-.Fa pptype is
-.Dv NULL
-or if
-.Pf * Fa pptype
-is
-.Dv V_ASN1_UNDEF
-then
-.Pf * Fa ppval Ns 's
-value is undefined.
-.Pp
-.Fn X509_ALGOR_cmp
-compares
-.Fa a
-and
-.Fa b .
-.Sh RETURN VALUES
-.Fn X509_ALGOR_new
-and
-.Fn X509_ALGOR_dup
-return a new
-.Vt X509_ALGOR
-object or
-.Dv NULL
-if an error occurs.
-.Pp
-.Fn X509_ALGOR_set0
-returns 1 for success or 0 if
-.Fa alg
-is
-.Dv NULL
-or memory allocation fails.
-.Pp
-.Fn X509_ALGOR_cmp
-returns 0 if
-.Fa a
-and
-.Fa b
-have identical encodings or non-zero otherwise.
-.Sh SEE ALSO
-.Xr ASN1_TYPE_set 3 ,
-.Xr d2i_X509_ALGOR 3 ,
-.Xr EVP_DigestInit 3 ,
-.Xr OBJ_nid2obj 3 ,
-.Xr X509_get0_signature 3 ,
-.Xr X509_new 3 ,
-.Xr X509_PUBKEY_get0_param 3 ,
-.Xr X509_signature_dump 3
-.Sh STANDARDS
-RFC 5280: Internet X.509 Public Key Infrastructure Certificate and
-Certificate Revocation List (CRL) Profile
-.Sh HISTORY
-.Fn X509_ALGOR_new
-and
-.Fn X509_ALGOR_free
-appeared in SSLeay 0.4 or earlier and have been available since
-.Ox 2.4 .
-.Pp
-.Fn X509_ALGOR_dup
-first appeared in SSLeay 0.9.1 and has been available since
-.Ox 2.6 .
-.Pp
-.Fn X509_ALGOR_set0
-and
-.Fn X509_ALGOR_get0
-first appeared in OpenSSL 0.9.8h and have been available since
-.Ox 4.5 .
-.Pp
-.Fn X509_ALGOR_cmp
-first appeared in OpenSSL 0.9.8zd, 1.0.0p, and 1.0.1k
-and has been available since
-.Ox 4.9 .