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.\" ========================================================================
.\"
.IX Title "X509_ALGOR_DUP 3"
.TH X509_ALGOR_DUP 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.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 \fBalg\fR.
.PP
\&\fBX509_ALGOR_set0()\fR sets the algorithm \s-1OID\s0 of \fBalg\fR to \fBaobj\fR and the
associated parameter type to \fBptype\fR with value \fBpval\fR. If \fBptype\fR is
\&\fBV_ASN1_UNDEF\fR the parameter is omitted, otherwise \fBptype\fR and \fBpval\fR have
the same meaning as the \fBtype\fR and \fBvalue\fR parameters to \fBASN1_TYPE_set()\fR.
All the supplied parameters are used internally so must \fB\s-1NOT\s0\fR be freed after
this call.
.PP
\&\fBX509_ALGOR_get0()\fR is the inverse of \fBX509_ALGOR_set0()\fR: it returns the
algorithm \s-1OID\s0 in \fB*paobj\fR and the associated parameter in \fB*pptype\fR
and \fB*ppval\fR from the \fBAlgorithmIdentifier\fR \fBalg\fR.
.PP
\&\fBX509_ALGOR_set_md()\fR sets the \fBAlgorithmIdentifier\fR \fBalg\fR to appropriate
values for the message digest \fBmd\fR.
.PP
\&\fBX509_ALGOR_cmp()\fR compares \fBa\fR and \fBb\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 \s-1NULL\s0 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\-2020 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.

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