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EVP_PKEY_NEW(3) Library Functions Manual EVP_PKEY_NEW(3)

EVP_PKEY_new, EVP_PKEY_up_ref, EVP_PKEY_free
private key allocation functions

#include <openssl/evp.h>
EVP_PKEY *
EVP_PKEY_new(void);
int
EVP_PKEY_up_ref(EVP_PKEY *key);
void
EVP_PKEY_free(EVP_PKEY *key);

The EVP_PKEY structure is used by various OpenSSL functions which require a general private key without reference to any particular algorithm.
The EVP_PKEY_new() function allocates an empty EVP_PKEY structure. The reference count is set to 1. To add a private key to it, use the functions described in EVP_PKEY_set1_RSA(3).
EVP_PKEY_up_ref() increments the reference count of key by 1.
EVP_PKEY_free() decrements the reference count of key by 1, and if the reference count reaches zero, frees it up. If key is a NULL pointer, no action occurs.

EVP_PKEY_new() returns either the newly allocated EVP_PKEY structure or NULL if an error occurred.
EVP_PKEY_up_ref() returns 1 for success or 0 for failure.

EVP_PKEY_asn1_set_free(3), EVP_PKEY_set1_RSA(3)

EVP_PKEY_new() and EVP_PKEY_free() first appeared in SSLeay 0.6.0 and have been available since OpenBSD 2.4.
EVP_PKEY_up_ref() first appeared in OpenSSL 1.1.0 and has been available since OpenBSD 6.3.
March 27, 2018 OpenBSD-current