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.\" ========================================================================
.\"
.IX Title "OSSL_PARAM_DUP 3ossl"
.TH OSSL_PARAM_DUP 3ossl "2024-09-03" "3.1.7+quic" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
OSSL_PARAM_dup, OSSL_PARAM_merge, OSSL_PARAM_free
\&\- OSSL_PARAM array copy functions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/params.h>
\&
\& OSSL_PARAM *OSSL_PARAM_dup(const OSSL_PARAM *params);
\& OSSL_PARAM *OSSL_PARAM_merge(const OSSL_PARAM *params, const OSSL_PARAM *params1);
\& void OSSL_PARAM_free(OSSL_PARAM *params);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Algorithm parameters can be exported/imported from/to providers using arrays of
\&\s-1\fBOSSL_PARAM\s0\fR\|(3). The following utility functions allow the parameters to be
duplicated and merged with other \s-1\fBOSSL_PARAM\s0\fR\|(3) to assist in this process.
.PP
\&\fBOSSL_PARAM_dup()\fR duplicates the parameter array \fIparams\fR. This function does a
deep copy of the data.
.PP
\&\fBOSSL_PARAM_merge()\fR merges the parameter arrays \fIparams\fR and \fIparams1\fR into a
new parameter array. If \fIparams\fR and \fIparams1\fR contain values with the same
\&'key' then the value from \fIparams1\fR will replace the \fIparam\fR value. This
function does a shallow copy of the parameters. Either \fIparams\fR or \fIparams1\fR
may be \s-1NULL.\s0 The behaviour of the merge is unpredictable if \fIparams\fR and
\&\fIparams1\fR contain the same key, and there are multiple entries within either
array that have the same key.
.PP
\&\fBOSSL_PARAM_free()\fR frees the parameter array \fIparams\fR that was created using
\&\fBOSSL_PARAM_dup()\fR, \fBOSSL_PARAM_merge()\fR or \fBOSSL_PARAM_BLD_to_param()\fR.
If the argument to \fBOSSL_PARAM_free()\fR is \s-1NULL,\s0 nothing is done.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The functions \fBOSSL_PARAM_dup()\fR and \fBOSSL_PARAM_merge()\fR return a newly allocated
\&\s-1\fBOSSL_PARAM\s0\fR\|(3) array, or \s-1NULL\s0 if there was an error. If both parameters are \s-1NULL\s0
 then \s-1NULL\s0 is returned.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\s-1\fBOSSL_PARAM\s0\fR\|(3), \s-1\fBOSSL_PARAM_BLD\s0\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The functions were added in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2021\-2024 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (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>.