Provided by: libssl-doc_3.0.13-0ubuntu3.4_all bug

NAME
       EVP_PKEY_todata, EVP_PKEY_export - functions to return keys as an array of key parameters


SYNOPSIS
        #include <openssl/evp.h>

        int EVP_PKEY_todata(const EVP_PKEY *pkey, int selection, OSSL_PARAM **params);
        int EVP_PKEY_export(const EVP_PKEY *pkey, int selection,
                            OSSL_CALLBACK *export_cb, void *export_cbarg);


DESCRIPTION
       The functions described here are used to extract EVP_PKEY key values as an array of
       OSSL_PARAM(3).

       EVP_PKEY_todata() extracts values from a key pkey using the selection.  selection is
       described in "Selections" in EVP_PKEY_fromdata(3).  OSSL_PARAM_free(3) should be used to
       free the returned parameters in *params.

       EVP_PKEY_export() is similar to EVP_PKEY_todata() but uses a callback export_cb that gets
       passed the value of export_cbarg.  See openssl-core.h(7) for more information about the
       callback. Note that the OSSL_PARAM(3) array that is passed to the callback is not
       persistent after the callback returns. The user must preserve the items of interest, or
       use EVP_PKEY_todata() if persistence is required.


NOTES
       These functions only work with key management methods coming from a provider.  This is the
       mirror function to EVP_PKEY_fromdata(3).


RETURN VALUES
       EVP_PKEY_todata() and EVP_PKEY_export() return 1 for success and 0 for failure.


SEE ALSO
       OSSL_PARAM(3), openssl-core.h(7), EVP_PKEY_fromdata(3), EVP_PKEY-RSA(7), EVP_PKEY-DSA(7),
       EVP_PKEY-DH(7), EVP_PKEY-EC(7), EVP_PKEY-ED448(7), EVP_PKEY-X25519(7), EVP_PKEY-X448(7),
       EVP_PKEY-ED25519(7)


HISTORY
       These functions were added in OpenSSL 3.0.


COPYRIGHT
       Copyright 2021-2023 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>.