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.IX Title "X509_ALGOR_DUP 3ssl"
.TH X509_ALGOR_DUP 3ssl 2024-01-30 3.2.1 OpenSSL
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH NAME
X509_ALGOR_dup,
X509_ALGOR_set0, X509_ALGOR_get0,
X509_ALGOR_set_md, X509_ALGOR_cmp,
X509_ALGOR_copy \- AlgorithmIdentifier functions
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/x509.h>
\&
\& X509_ALGOR *X509_ALGOR_dup(X509_ALGOR *alg);
\& int X509_ALGOR_set0(X509_ALGOR *alg, ASN1_OBJECT *aobj, int ptype, void *pval);
\& void X509_ALGOR_get0(const ASN1_OBJECT **paobj, int *pptype,
\&                      const void **ppval, const X509_ALGOR *alg);
\& void X509_ALGOR_set_md(X509_ALGOR *alg, const EVP_MD *md);
\& int X509_ALGOR_cmp(const X509_ALGOR *a, const X509_ALGOR *b);
\& int X509_ALGOR_copy(X509_ALGOR *dest, const X509_ALGOR *src);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\fBX509_ALGOR_dup()\fR returns a copy of \fIalg\fR.
.PP
\&\fBX509_ALGOR_set0()\fR sets the algorithm OID of \fIalg\fR to \fIaobj\fR and the
associated parameter type to \fIptype\fR with value \fIpval\fR. If \fIptype\fR is
\&\fBV_ASN1_UNDEF\fR the parameter is omitted, otherwise \fIptype\fR and \fIpval\fR have
the same meaning as the \fItype\fR and \fIvalue\fR parameters to \fBASN1_TYPE_set()\fR.
All the supplied parameters are used internally so must \fBNOT\fR be freed after
this call succeeded;
otherwise ownership remains with the caller and \fIalg\fR remains untouched.
.PP
\&\fBX509_ALGOR_get0()\fR is the inverse of \fBX509_ALGOR_set0()\fR: it returns the
algorithm OID in \fI*paobj\fR and the associated parameter in \fI*pptype\fR
and \fI*ppval\fR from the \fBAlgorithmIdentifier\fR \fIalg\fR.
.PP
\&\fBX509_ALGOR_set_md()\fR sets the \fBAlgorithmIdentifier\fR \fIalg\fR to appropriate
values for the message digest \fImd\fR.
.PP
\&\fBX509_ALGOR_cmp()\fR compares \fIa\fR and \fIb\fR and returns 0 if they have identical
encodings and nonzero otherwise.
.PP
\&\fBX509_ALGOR_copy()\fR copies the source values into the dest structs; making
a duplicate of each (and free any thing pointed to from within *dest).
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBX509_ALGOR_dup()\fR returns a valid \fBX509_ALGOR\fR structure or NULL if an error
occurred.
.PP
\&\fBX509_ALGOR_set0()\fR and \fBX509_ALGOR_copy()\fR return 1 on success or 0 on error.
.PP
\&\fBX509_ALGOR_get0()\fR and \fBX509_ALGOR_set_md()\fR return no values.
.PP
\&\fBX509_ALGOR_cmp()\fR returns 0 if the two parameters have identical encodings and
nonzero otherwise.
.SH HISTORY
.IX Header "HISTORY"
The \fBX509_ALGOR_copy()\fR was added in 1.1.1e.
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright 2002\-2022 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
<https://www.openssl.org/source/license.html>.