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.\" $NetBSD: OSSL_IETF_ATTR_SYNTAX.3,v 1.5 2026/04/08 17:06:45 christos Exp $
.\"
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.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
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.\"
.IX Title "OSSL_IETF_ATTR_SYNTAX 3"
.TH OSSL_IETF_ATTR_SYNTAX 3 2026-04-07 3.5.6 OpenSSL
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH NAME
OSSL_IETF_ATTR_SYNTAX,
OSSL_IETF_ATTR_SYNTAX_get0_policyAuthority,
OSSL_IETF_ATTR_SYNTAX_set0_policyAuthority,
OSSL_IETF_ATTR_SYNTAX_get_value_num,
OSSL_IETF_ATTR_SYNTAX_get0_value,
OSSL_IETF_ATTR_SYNTAX_add1_value
\&\- Accessors and setters for OSSL_IETF_ATTR_SYNTAX
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/x509_acert.h>
\&
\& typedef struct OSSL_IETF_ATTR_SYNTAX_st OSSL_IETF_ATTR_SYNTAX;
\&
\& const GENERAL_NAMES *
\& OSSL_IETF_ATTR_SYNTAX_get0_policyAuthority(const OSSL_IETF_ATTR_SYNTAX *a);
\& void OSSL_IETF_ATTR_SYNTAX_set0_policyAuthority(OSSL_IETF_ATTR_SYNTAX *a,
\& GENERAL_NAMES *names);
\&
\& int OSSL_IETF_ATTR_SYNTAX_get_value_num(const OSSL_IETF_ATTR_SYNTAX *a);
\& void *OSSL_IETF_ATTR_SYNTAX_get0_value(const OSSL_IETF_ATTR_SYNTAX *a,
\& int ind, int *type);
\& int OSSL_IETF_ATTR_SYNTAX_add1_value(OSSL_IETF_ATTR_SYNTAX *a, int type,
\& void *data);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\fBOSSL_IETF_ATTR_SYNTAX\fR is an opaque structure that represents the
IetfAttrSyntax type defined in RFC 5755 (Section 4.4) for use
as an AttributeValue.
.PP
\&\fBOSSL_IETF_ATTR_SYNTAX_get0_policyAuthority()\fR and \fBOSSL_IETF_ATTR_SYNTAX_set0_policyAuthority()\fR
get and set the policyAuthority field of the structure. Both routines act on
internal pointers of the structure and must not be freed by the application.
.PP
An \fBOSSL_IETF_ATTR_SYNTAX\fR object also holds a sequence of values.
\&\fBOSSL_IETF_ATTR_SYNTAX_get_value_num()\fR returns the number of values in the
sequence. \fBOSSL_IETF_ATTR_SYNTAX_add1_value()\fR, adds a copy of \fIdata\fR of a specified
\&\fItype\fR to the sequence. The caller should free the \fIdata\fR after use.
.PP
\&\fBOSSL_IETF_ATTR_SYNTAX_get0_value()\fR will return the value and a specific index \fIind\fR
in the sequence or NULL on error. If \fItype\fR is not NULL, the type of the
value will be written to this location.
.PP
The \fItype\fR of the values stored in the \fBOSSL_IETF_ATTR_SYNTAX\fR value sequence is
one of the following:
.IP OSSL_IETFAS_OCTETS 4
.IX Item "OSSL_IETFAS_OCTETS"
A pointer to an ASN1_OCTET_STRING
.IP OSSL_IETFAS_OID 4
.IX Item "OSSL_IETFAS_OID"
A pointer to an ASN1_OBJECT
.IP OSSL_IETFAS_STRING 4
.IX Item "OSSL_IETFAS_STRING"
A pointer to an ASN1_UTF8STRING
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBOSSL_IETF_ATTR_SYNTAX_get0_policyAuthority()\fR returns an pointer to a
\&\fBGENERAL_NAMES\fR structure or \fBNULL\fR if the policy authority has not been
set.
.PP
\&\fBOSSL_IETF_ATTR_SYNTAX_get_value_num()\fR returns the number of entries in the value
sequence or \-1 on error.
.PP
\&\fBOSSL_IETF_ATTR_SYNTAX_get0_value()\fR returns a pointer to the value at the given index
or NULL if the index is out of range.
.PP
\&\fBOSSL_IETF_ATTR_SYNTAX_add1_value()\fR returns 1 on success and 0 on failure.
.SH HISTORY
.IX Header "HISTORY"
\&\fBOSSL_IETF_ATTR_SYNTAX_get0_policyAuthority()\fR, \fBOSSL_IETF_ATTR_SYNTAX_set0_policyAuthority()\fR,
\&\fBOSSL_IETF_ATTR_SYNTAX_get_value_num()\fR, \fBOSSL_IETF_ATTR_SYNTAX_get0_value()\fR, and
\&\fBOSSL_IETF_ATTR_SYNTAX_add1_value()\fR were added in OpenSSL 3.4.
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright 2021\-2024 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
<https://www.openssl.org/source/license.html>.
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