1EVP_PKEY_TODATA(3ossl)              OpenSSL             EVP_PKEY_TODATA(3ossl)
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NAME

6       EVP_PKEY_todata, EVP_PKEY_export - functions to return keys as an array
7       of key parameters
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SYNOPSIS

10        #include <openssl/evp.h>
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12        int EVP_PKEY_todata(const EVP_PKEY *pkey, int selection, OSSL_PARAM **params);
13        int EVP_PKEY_export(const EVP_PKEY *pkey, int selection,
14                            OSSL_CALLBACK *export_cb, void *export_cbarg);
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DESCRIPTION

17       The functions described here are used to extract EVP_PKEY key values as
18       an array of OSSL_PARAM.
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20       EVP_PKEY_todata() extracts values from a key pkey using the selection.
21       selection is described in "Selections" in EVP_PKEY_fromdata(3).
22       OSSL_PARAM_free(3) should be used to free the returned parameters in
23       *params.
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25       EVP_PKEY_export() is similiar to EVP_PKEY_todata() but uses a callback
26       export_cb that gets passed the value of export_cbarg.  See
27       openssl-core.h(7) for more information about the callback. Note that
28       the OSSL_PARAM array that is passed to the callback is not persistent
29       after the callback returns. The user must preserve the items of
30       interest, or use EVP_PKEY_todata() if persistence is required.
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NOTES

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

37       EVP_PKEY_todata() and EVP_PKEY_export() return 1 for success and 0 for
38       failure.
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SEE ALSO

41       OSSL_PARAM(3), openssl-core.h(7), EVP_PKEY_fromdata(3),
42       EVP_PKEY-RSA(7), EVP_PKEY-DSA(7), EVP_PKEY-DH(7), EVP_PKEY-EC(7),
43       EVP_PKEY-ED448(7), EVP_PKEY-X25519(7), EVP_PKEY-X448(7),
44       EVP_PKEY-ED25519(7)
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HISTORY

47       These 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                             2022-07-05            EVP_PKEY_TODATA(3ossl)
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