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.
These functions were added in OpenSSL 3.0.
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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.