src/lib/libcrypto/man/ASN1_OBJECT_new.3

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.Dd $Mdocdate: December 15 2021 $
.Dt ASN1_OBJECT_NEW 3
.Os
.Sh NAME
.Nm ASN1_OBJECT_new ,
.Nm ASN1_OBJECT_create ,
.Nm ASN1_OBJECT_free
.Nd ASN.1 object identifiers
.Sh SYNOPSIS
.In openssl/asn1.h
.Ft ASN1_OBJECT *
.Fo ASN1_OBJECT_new
.Fa void
.Fc
.Ft ASN1_OBJECT *
.Fo ASN1_OBJECT_create
.Fa "int nid"
.Fa "unsigned char *content"
.Fa "int len"
.Fa "const char *short_name"
.Fa "const char *long_name"
.Fc
.Ft void
.Fo ASN1_OBJECT_free
.Fa "ASN1_OBJECT *a"
.Fc
.Sh DESCRIPTION
.Fn ASN1_OBJECT_new
allocates and initializes an empty
.Vt 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.
.Pp
The ASN.1 object identifier type is also represented by the
.Dv V_ASN1_OBJECT
type identifier constant.
.Pp
.Fn ASN1_OBJECT_create
allocates a new
.Vt ASN1_OBJECT
with the given
.Fa nid ,
copies the
.Fa len
DER
.Fa content
octets, the
.Fa short_name ,
and the
.Fa long_name
into it, and marks the new object and all data contained in it
as dynamically allocated.
.Pp
Application programs normally use utility functions like
.Xr OBJ_nid2obj 3
rather than using
.Fn ASN1_OBJECT_new
or
.Fn ASN1_OBJECT_create
directly.
.Pp
.Fn ASN1_OBJECT_free
has the following effects:
.Pp
All data contained in
.Fa a
that is marked as dynamically allocated is freed,
and the respective fields of
.Fa a
become empty.
Contained data not marked as dynamically allocated remains intact.
.Pp
If the object
.Fa a
itself is marked as dynamically allocated, it is freed.
Otherwise, the pointer
.Fa a
remains valid.
.Pp
If
.Fa a
is a
.Dv NULL
pointer or if neither the object itself nor any of its content
is marked as dynamically allocated, no action occurs.
.Sh RETURN VALUES
.Fn ASN1_OBJECT_new
and
.Fn ASN1_OBJECT_create
return a pointer to the new object or
.Dv NULL
if memory allocation fails,
.Sh ERRORS
After failure of
.Fn ASN1_OBJECT_new
or
.Fn ASN1_OBJECT_create ,
the following diagnostic can be retrieved with
.Xr ERR_get_error 3 ,
.Xr ERR_GET_REASON 3 ,
and
.Xr ERR_reason_error_string 3 :
.Bl -tag -width Ds
.It Dv ERR_R_MALLOC_FAILURE Qq "malloc failure"
Memory allocation failed.
.El
.Pp
After some cases of failure of
.Fn ASN1_OBJECT_create ,
the following diagnostic can be retrieved in addition to the above:
.Bl -tag -width Ds
.It Dv ERR_R_ASN1_LIB Qq "ASN1 lib"
Memory allocation failed.
.El
.Sh SEE ALSO
.Xr a2d_ASN1_OBJECT 3 ,
.Xr ASN1_TYPE_get 3 ,
.Xr d2i_ASN1_OBJECT 3 ,
.Xr OBJ_create 3 ,
.Xr OBJ_nid2obj 3
.Sh 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
.Pp
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
.Sh HISTORY
.Fn ASN1_OBJECT_new
and
.Fn ASN1_OBJECT_free
first appeared in SSLeay 0.5.1 and
.Fn ASN1_OBJECT_create
in SSLeay 0.8.0.
These functions have been available since
.Ox 2.4 .