NAME
ASN1_OBJECT_new,
ASN1_OBJECT_create,
ASN1_OBJECT_free —
ASN.1 object identifiers
SYNOPSIS
#include
<openssl/asn1.h>
ASN1_OBJECT *
ASN1_OBJECT_new(void);
ASN1_OBJECT *
ASN1_OBJECT_create(int nid,
unsigned char *content, int len,
const char *short_name, const char
*long_name);
void
ASN1_OBJECT_free(ASN1_OBJECT
*a);
DESCRIPTION
ASN1_OBJECT_new()
allocates and initializes an empty ASN1_OBJECT object,
representing an ASN.1 OBJECT IDENTIFIER. It can hold a short name, a long
name, a numeric identifier (NID), and a sequence of integers identifying a
node in the International Object Identifier tree as specified in ITU-T
recommendation X.660. The new object is marked as dynamically allocated.
The ASN.1 object identifier type is also represented by the
V_ASN1_OBJECT type identifier constant.
ASN1_OBJECT_create()
allocates a new ASN1_OBJECT with the given
nid, copies the len DER
content octets, the short_name,
and the long_name into it, and marks the new object
and all data contained in it as dynamically allocated.
Application programs normally use utility
functions like
OBJ_nid2obj(3) rather than using
ASN1_OBJECT_new()
or ASN1_OBJECT_create() directly.
ASN1_OBJECT_free()
has the following effects:
All data contained in a that is marked as dynamically allocated is freed, and the respective fields of a become empty. Contained data not marked as dynamically allocated remains intact.
If the object a itself is marked as dynamically allocated, it is freed. Otherwise, the pointer a remains valid.
If a is a NULL
pointer or if neither the object itself nor any of its content is marked as
dynamically allocated, no action occurs.
RETURN VALUES
ASN1_OBJECT_new() and
ASN1_OBJECT_create() return a pointer to the new
object or NULL if memory allocation fails,
ERRORS
After failure of ASN1_OBJECT_new() or
ASN1_OBJECT_create(), the following diagnostic can
be retrieved with
ERR_get_error(3),
ERR_GET_REASON(3), and
ERR_reason_error_string(3):
ERR_R_MALLOC_FAILURE"malloc failure"- Memory allocation failed.
After some cases of failure of
ASN1_OBJECT_create(), the following diagnostic can
be retrieved in addition to the above:
ERR_R_ASN1_LIB"ASN1 lib"- Memory allocation failed.
SEE ALSO
a2d_ASN1_OBJECT(3), ASN1_TYPE_get(3), d2i_ASN1_OBJECT(3), OBJ_create(3), OBJ_nid2obj(3)
STANDARDS
ITU-T Recommendation X.208, also known as ISO/IEC 8824-1: Specification of Abstract Syntax Notation One (ASN.1), section 28: Notation for the object identifier type
ITU-T Recommendation X.690, also known as ISO/IEC 8825-1: Information technology - ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER), section 8.19: Encoding of an object identifier value
HISTORY
ASN1_OBJECT_new() and
ASN1_OBJECT_free() first appeared in SSLeay 0.5.1
and ASN1_OBJECT_create() in SSLeay 0.8.0. These
functions have been available since OpenBSD 2.4.
BUGS
The function ASN1_OBJECT_new() is not
useful for any practical purpose because the library does not provide any
function capable of adding data to an existing object. Consequently, if the
application program creates an object with
ASN1_OBJECT_new(), that object will always remain
empty.
Similarly, if an nid of
NID_undef is passed to
ASN1_OBJECT_create(), or if
NULL is passed for any of its pointer arguments, the
returned object will permanently remain incomplete.