.\" $OpenBSD: d2i_X509_ALGOR.3,v 1.10 2021/11/03 15:02:14 schwarze Exp $
.\"
.\" Copyright (c) 2016, 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: November 3 2021 $
.Dt D2I_X509_ALGOR 3
.Os
.Sh NAME
.Nm d2i_X509_ALGOR ,
.Nm i2d_X509_ALGOR ,
.Nm d2i_X509_ALGORS ,
.Nm i2d_X509_ALGORS
.Nd decode and encode algorithm identifiers
.Sh SYNOPSIS
.In openssl/x509.h
.Ft X509_ALGOR *
.Fo d2i_X509_ALGOR
.Fa "X509_ALGOR **val_out"
.Fa "unsigned char **der_in"
.Fa "long length"
.Fc
.Ft int
.Fo i2d_X509_ALGOR
.Fa "X509_ALGOR *val_in"
.Fa "unsigned char **der_out"
.Fc
.Ft X509_ALGORS *
.Fo d2i_X509_ALGORS
.Fa "X509_ALGORS **val_out"
.Fa "const unsigned char **der_in"
.Fa "long length"
.Fc
.Ft int
.Fo i2d_X509_ALGORS
.Fa "X509_ALGORS *val_in"
.Fa "unsigned char **der_out"
.Fc
.Sh DESCRIPTION
.Fn d2i_X509_ALGOR
and
.Fn i2d_X509_ALGOR
decode and encode an ASN.1
.Vt AlgorithmIdentifier
structure defined in RFC 5280 section 4.1.1.2.
.Pp
.Fn d2i_X509_ALGORS
and
.Fn i2d_X509_ALGORS
decode and encode an ASN.1 sequence of
.Vt AlgorithmIdentifier
structures.
The data type
.Vt X509_ALGORS
is defined as
.Vt STACK_OF(X509_ALGOR) .
.Pp
For details about the semantics, examples, caveats, and bugs, see
.Xr ASN1_item_d2i 3 .
.Sh SEE ALSO
.Xr ASN1_item_d2i 3 ,
.Xr STACK_OF 3 ,
.Xr X509_ALGOR_new 3
.Sh STANDARDS
RFC 5280: Internet X.509 Public Key Infrastructure Certificate and
Certificate Revocation List (CRL) Profile
.Sh HISTORY
.Fn d2i_X509_ALGOR
and
.Fn i2d_X509_ALGOR
first appeared in SSLeay 0.5.1 and have been available since
.Ox 2.4 .
.Pp
.Fn d2i_X509_ALGORS
and
.Fn i2d_X509_ALGORS
first appeared in OpenSSL 0.9.8h and have been available since
.Ox 4.5 .