1OSSL_PARAM_DUP(3ossl)               OpenSSL              OSSL_PARAM_DUP(3ossl)
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NAME

6       OSSL_PARAM_dup, OSSL_PARAM_merge, OSSL_PARAM_free - OSSL_PARAM array
7       copy functions
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SYNOPSIS

10        #include <openssl/params.h>
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12        OSSL_PARAM *OSSL_PARAM_dup(const OSSL_PARAM *params);
13        OSSL_PARAM *OSSL_PARAM_merge(const OSSL_PARAM *params, const OSSL_PARAM *params1);
14        void OSSL_PARAM_free(OSSL_PARAM *params);
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DESCRIPTION

17       Algorithm parameters can be exported/imported from/to providers using
18       arrays of OSSL_PARAM. The following utility functions allow the
19       parameters to be duplicated and merged with other OSSL_PARAM to assist
20       in this process.
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22       OSSL_PARAM_dup() duplicates the parameter array params. This function
23       does a deep copy of the data.
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25       OSSL_PARAM_merge() merges the parameter arrays params and params1 into
26       a new parameter array. If params and params1 contain values with the
27       same 'key' then the value from params1 will replace the param value.
28       This function does a shallow copy of the parameters. Either params or
29       params1 may be NULL. The behaviour of the merge is unpredictable if
30       params and params1 contain the same key, and there are multiple entries
31       within either array that have the same key.
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33       OSSL_PARAM_free() frees the parameter array params that was created
34       using OSSL_PARAM_dup(), OSSL_PARAM_merge() or
35       OSSL_PARAM_BLD_to_param().
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RETURN VALUES

38       The functions OSSL_PARAM_dup() and OSSL_PARAM_merge() return a newly
39       allocated OSSL_PARAM array, or NULL if there was an error. If both
40       parameters are NULL
41        then NULL is returned.
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SEE ALSO

44       OSSL_PARAM(3), OSSL_PARAM_BLD(3)
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HISTORY

47       The functions were added in OpenSSL 3.0.
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50       Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.
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52       Licensed under the Apache License 2.0 (the "License").  You may not use
53       this file except in compliance with the License.  You can obtain a copy
54       in the file LICENSE in the source distribution or at
55       <https://www.openssl.org/source/license.html>.
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593.0.5                             2022-11-01             OSSL_PARAM_DUP(3ossl)
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