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OSSL_PARAM_dup(3)                   OpenSSL                  OSSL_PARAM_dup(3)



NAME
       OSSL_PARAM_dup, OSSL_PARAM_merge, OSSL_PARAM_free - OSSL_PARAM array
       copy functions

LIBRARY
       libcrypto, -lcrypto

SYNOPSIS
        #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);

DESCRIPTION
       Algorithm parameters can be exported/imported from/to providers using
       arrays of OSSL_PARAM(3). The following utility functions allow the
       parameters to be duplicated and merged with other OSSL_PARAM(3) to
       assist in this process.

       OSSL_PARAM_dup() duplicates the parameter array params. This function
       does a deep copy of the data.

       OSSL_PARAM_merge() merges the parameter arrays params and params1 into
       a new parameter array. If params and params1 contain values with the
       same 'key' then the value from params1 will replace the param value.
       This function does a shallow copy of the parameters. Either params or
       params1 may be NULL. The behaviour of the merge is unpredictable if
       params and params1 contain the same key, and there are multiple entries
       within either array that have the same key.

       OSSL_PARAM_free() frees the parameter array params that was created
       using OSSL_PARAM_dup(), OSSL_PARAM_merge() or
       OSSL_PARAM_BLD_to_param().

RETURN VALUES
       The functions OSSL_PARAM_dup() and OSSL_PARAM_merge() return a newly
       allocated OSSL_PARAM(3) array, or NULL if there was an error. If both
       parameters are NULL
        then NULL is returned.

SEE ALSO
       OSSL_PARAM(3), OSSL_PARAM_BLD(3)

HISTORY
       The functions were added in OpenSSL 3.0.

COPYRIGHT
       Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.

       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>.



3.0.12                            2023-05-07                 OSSL_PARAM_dup(3)