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-.\" $OpenBSD: d2i_ASN1_OBJECT.3,v 1.15 2025/03/14 21:32:15 tb Exp $
-.\"
-.\" Copyright (c) 2017, 2022, 2023 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.
-.\"
-.Dd $Mdocdate: March 14 2025 $
-.Dt D2I_ASN1_OBJECT 3
-.Os
-.Sh NAME
-.Nm d2i_ASN1_OBJECT ,
-.Nm i2d_ASN1_OBJECT ,
-.Nm OBJ_get0_data ,
-.Nm OBJ_length
-.Nd decode and encode ASN.1 object identifiers
-.Sh SYNOPSIS
-.In openssl/asn1.h
-.Ft ASN1_OBJECT *
-.Fo d2i_ASN1_OBJECT
-.Fa "ASN1_OBJECT **val_out"
-.Fa "const unsigned char **der_in"
-.Fa "long length"
-.Fc
-.Ft int
-.Fo i2d_ASN1_OBJECT
-.Fa "const ASN1_OBJECT *val_in"
-.Fa "unsigned char **der_out"
-.Fc
-.In openssl/objects.h
-.Ft const unsigned char *
-.Fn OBJ_get0_data "const ASN1_OBJECT *val_in"
-.Ft size_t
-.Fn OBJ_length "const ASN1_OBJECT *val_in"
-.Sh DESCRIPTION
-These functions decode and encode ASN.1 object identifiers.
-For details about the semantics, examples, caveats, and bugs, see
-.Xr ASN1_item_d2i 3 .
-.Pp
-The LibreSSL implementation of
-.Fn d2i_ASN1_OBJECT
-always calls
-.Xr ASN1_OBJECT_free 3
-if an existing object is passed in via
-.Fa val_out
-and it always creates a new object from scratch.
-Other implementations may attempt to reuse an existing object,
-which is fragile and prone to bugs.
-Consequently, always passing
-.Dv NULL
-for the
-.Fa val_out
-argument is recommended.
-.Pp
-The objects returned from
-.Fn d2i_ASN1_OBJECT
-and the data contained in them are always marked as dynamically
-allocated, so when they are no longer needed,
-.Xr ASN1_OBJECT_free 3
-can be called on them.
-.Pp
-.Fn i2d_ASN1_OBJECT
-encodes the object identifier pointed to by
-.Fa val_in
-into DER format.
-.Fn OBJ_get0_data
-and
-.Fn OBJ_length
-only deal with the content octets of that DER encoding,
-without taking the identifier and length octets into account.
-.Sh RETURN VALUES
-.Fn d2i_ASN1_OBJECT
-returns a pointer to the new
-.Vt ASN1_OBJECT
-object or
-.Dv NULL
-if an error occurs.
-With other implementations, it might return a pointer to the reused
-.Vt ASN1_OBJECT .
-.Pp
-.Fn i2d_ASN1_OBJECT
-returns the number of octets successfully encoded
-or a value <= 0 if an error occurs.
-.Pp
-.Fn OBJ_get0_data
-returns an internal pointer to the first content octet of the DER
-encoding of
-.Fa val_in .
-The other content octets follow the returned pointer contiguously.
-.Fn OBJ_length
-returns the number of content octets contained in the DER encoding of
-.Fa val_in .
-This number is always smaller than the total length of the encoding
-returned by
-.Xr ASN1_object_size 3 .
-.Pp
-If
-.Fa val_in
-is a
-.Dv NULL
-pointer or points to an empty object, for example one freshly created with
-.Xr ASN1_OBJECT_new 3 ,
-.Fn OBJ_get0_data
-returns
-.Dv NULL
-and
-.Fn OBJ_length
-returns zero.
-.Sh SEE ALSO
-.Xr a2d_ASN1_OBJECT 3 ,
-.Xr ASN1_item_d2i 3 ,
-.Xr ASN1_OBJECT_new 3 ,
-.Xr ASN1_put_object 3 ,
-.Xr OBJ_nid2obj 3
-.Sh STANDARDS
-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 d2i_ASN1_OBJECT
-and
-.Fn i2d_ASN1_OBJECT
-first appeared in SSLeay 0.5.1 and have been available since
-.Ox 2.4 .
-.Pp
-.Fn OBJ_get0_data
-and
-.Fn OBJ_length
-first appeared in OpenSSL 1.1.0 and have been available since
-.Ox 7.1 .
-.Sh CAVEATS
-.Fn d2i_ASN1_OBJECT
-never sets the long and short names of the object, not even if the
-object identifier matches one that is built into the library.
-To find the names of an object identifier parsed from DER or BER
-input, call
-.Xr OBJ_obj2nid 3
-on the returned object, and then
-.Xr OBJ_nid2sn 3
-and
-.Xr OBJ_nid2ln 3
-on the result.
-.Pp
-Calling
-.Fn OBJ_get0_data
-and then accessing memory in front of the returned pointer
-results in undefined behaviour.
-In particular, it is not possible to find the identifier or
-length octets in that way; use
-.Xr ASN1_put_object 3
-or
-.Fn i2d_ASN1_OBJECT
-instead.