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-.\"     $OpenBSD: d2i_ASN1_NULL.3,v 1.5 2023/09/26 09:36:22 tb Exp $
-.\"
-.\" Copyright (c) 2016 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: September 26 2023 $
-.Dt D2I_ASN1_NULL 3
-.Os
-.Sh NAME
-.Nm d2i_ASN1_NULL ,
-.Nm i2d_ASN1_NULL
-.Nd decode and encode an ASN.1 NULL type
-.Sh SYNOPSIS
-.In openssl/asn1.h
-.Ft ASN1_NULL *
-.Fo d2i_ASN1_NULL
-.Fa "ASN1_NULL **val_out"
-.Fa "const unsigned char **der_in"
-.Fa "long length"
-.Fc
-.Ft int
-.Fo i2d_ASN1_NULL
-.Fa "ASN1_NULL *val_in"
-.Fa "unsigned char **der_out"
-.Fc
-.Sh DESCRIPTION
-These functions decode and encode the ASN.1 value NULL of type NULL.
-For details about the semantics, examples, caveats, and bugs, see
-.Xr ASN1_item_d2i 3 .
-.Pp
-.Fn d2i_ASN1_NULL
-verifies that the BER-encoded value at
-.Pf * Fa der_in
-is NULL and of type NULL.
-It fails if
-.Fa length
-is less than 2 or if the first two bytes of
-.Pf * Fa der_in
-differ from 0x05 and 0x00.
-In case of success,
-.Pf * Fa der_in
-is advanced by two bytes and
-.Pf * Fa val_out
-is set to a specific invalid pointer representing the unique
-.Vt ASN1_NULL
-object.
-.Pp
-.Fn i2d_ASN1_NULL
-ignores
-.Fa val_in
-and encodes the ASN.1 value NULL of type NULL using DER.
-Specifically, it writes the identifier octet for the type NULL,
-0x05, followed by the length octet 0x00, and no content or
-end-of-content octets.
-.Sh RETURN VALUES
-.Fn d2i_ASN1_NULL
-returns a specific invalid pointer representing the unique
-.Vt ASN1_NULL
-object or
-.Dv NULL
-if an error occurs.
-.Pp
-.Fn i2d_ASN1_NULL
-returns 2 if successful or 0 if an error occurs.
-.Sh SEE ALSO
-.Xr ASN1_item_d2i 3 ,
-.Xr ASN1_item_new 3 ,
-.Xr ASN1_NULL_new 3 ,
-.Xr ASN1_TYPE_get 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 8.8: Encoding of a null value
-.Sh HISTORY
-.Fn d2i_ASN1_NULL
-and
-.Fn i2d_ASN1_NULL
-first appeared in OpenSSL 0.9.5 and have been available since
-.Ox 2.7 .