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-.\" $OpenBSD: BIO_new_NDEF.3,v 1.3 2021/12/13 13:46:09 schwarze Exp $
-.\"
-.\" Copyright (c) 2021 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: December 13 2021 $
-.Dt BIO_NEW_NDEF 3
-.Os
-.Sh NAME
-.Nm BIO_new_NDEF
-.Nd generic constructor for streaming BIO chains
-.Sh SYNOPSIS
-.In openssl/asn1.h
-.Ft BIO *
-.Fo BIO_new_NDEF
-.Fa "BIO *out_bio"
-.Fa "ASN1_VALUE *val_in"
-.Fa "const ASN1_ITEM *it"
-.Fc
-.Sh DESCRIPTION
-.Fn BIO_new_NDEF
-is a wrapper around
-.Xr BIO_new 3
-with a BIO
-.Fa type
-of
-.Xr BIO_f_asn1 3
-that supports streaming by providing the following additional functionality.
-.Pp
-The data type
-.Fa it
-needs to support streaming.
-Of the data types built into the library, currently only
-.Vt CMS_ContentInfo
-and
-.Vt PKCS7
-support that.
-The argument
-.Fa val_in
-needs to be of that type.
-.Pp
-A structure containing the following data is saved using
-.Xr BIO_ctrl 3
-with an argument of
-.Dv BIO_C_SET_EX_ARG
-as described in
-.Xr BIO_f_asn1 3 :
-.Pp
-.Bl -bullet -compact -offset indent
-.It
-the data type
-.Fa it
-.It
-the input value
-.Fa val_in
-.It
-a pointer to the
-.Vt unsigned char *
-content buffer of
-.Fa val_in ,
-extracted using a type-specific callback function
-.It
-a pointer to the new asn1 BIO
-.It
-a pointer to the beginning of the BIO chain;
-this may be the asn1 BIO itself, or one or more filter BIOs
-may be prepended to it in a type-specific manner,
-for example digest or encoding BIOs
-.El
-.Pp
-In order to handle the output from the new asn1 BIO, the
-.Fa out_bio
-is appended to it using
-.Xr BIO_push 3 .
-The
-.Fa out_bio
-can be a single sink BIO or a BIO chain ending in a sink BIO.
-.Pp
-A built-in
-.Fa prefix
-function is installed with
-.Xr BIO_asn1_set_prefix 3
-that encodes
-.Fa val_in
-using
-.Xr ASN1_item_ndef_i2d 3 ,
-and a built-in
-.Fa suffix
-function is installed that finalizes the written structures
-in a type-specific way.
-.Sh RETURN VALUES
-.Fn BIO_new_NDEF
-returns a pointer to the beginning of the constructed BIO chain or
-.Dv NULL
-if
-.Fa it
-does not support streaming or if memory allocation fails.
-.Sh SEE ALSO
-.Xr ASN1_item_ndef_i2d 3 ,
-.Xr BIO_ctrl 3 ,
-.Xr BIO_f_asn1 3 ,
-.Xr BIO_new 3 ,
-.Xr BIO_new_CMS 3 ,
-.Xr BIO_push 3 ,
-.Xr i2d_ASN1_bio_stream 3
-.Sh HISTORY
-.Fn BIO_new_NDEF
-first appeared in OpenSSL 1.0.0 and has been available since
-.Ox 4.9 .