OSSL_IETF_ATTR_SYNTAX, OSSL_IETF_ATTR_SYNTAX_get0_policyAuthority,

       Copyright 2021-2024 The OpenSSL Project Authors. All Rights Reserved.

       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>.

3.5.0                                              2025-06-04                        OSSL_IETF_ATTR_SYNTAX(3SSL)

OSSL_IETF_ATTR_SYNTAX is an opaque structure that represents the IetfAttrSyntax type defined in RFC 5755
       (Section 4.4) for use as an AttributeValue.

       OSSL_IETF_ATTR_SYNTAX_get0_policyAuthority() and OSSL_IETF_ATTR_SYNTAX_set0_policyAuthority() 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.

       An OSSL_IETF_ATTR_SYNTAX object also holds a sequence of values.  OSSL_IETF_ATTR_SYNTAX_get_value_num()
       returns the number of values in the sequence.  OSSL_IETF_ATTR_SYNTAX_add1_value(), adds a copy of data of
       a specified type to the sequence.  The caller should free the data after use.

       OSSL_IETF_ATTR_SYNTAX_get0_value() will return the value and a specific index ind in the sequence or NULL
       on error.  If type is not NULL, the type of the value will be written to this location.

       The type of the values stored in the OSSL_IETF_ATTR_SYNTAX value sequence is one of the following:

       OSSL_IETFAS_OCTETS
           A pointer to an ASN1_OCTET_STRING

       OSSL_IETFAS_OID
           A pointer to an ASN1_OBJECT

       OSSL_IETFAS_STRING
           A pointer to an ASN1_UTF8STRING

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(),              and
       OSSL_IETF_ATTR_SYNTAX_add1_value() were added in OpenSSL 3.4.

       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

OSSL_IETF_ATTR_SYNTAX_get0_policyAuthority()  returns  an pointer to a GENERAL_NAMES structure or NULL if
       the policy authority has not been set.

       OSSL_IETF_ATTR_SYNTAX_get_value_num() returns the number of entries in the value sequence or -1 on error.

       OSSL_IETF_ATTR_SYNTAX_get0_value() returns a pointer to the value at the given index or NULL if the index
       is out of range.

       OSSL_IETF_ATTR_SYNTAX_add1_value() returns 1 on success and 0 on failure.

        #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);