EVP_PKEY_todata, EVP_PKEY_export - functions to return keys as an array of key
parameters
#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);
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.
These functions only work with key management methods coming from a provider.
This is the mirror function to
EVP_PKEY_fromdata(3).
EVP_PKEY_todata() and
EVP_PKEY_export() return 1 for success and 0
for failure.
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)
These functions were added in OpenSSL 3.0.
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>.