DESCRIPTIONThe EVP_PKEY_new() function allocates an empty EVP_PKEY structure
which is used by OpenSSL to store private keys.
EVP_PKEY_free() frees up the private key key.
NOTESThe EVP_PKEY structure is used by various
OpenSSL functions which require a general private key without reference
to any particular algorithm.
The structure returned by EVP_PKEY_new() is empty. To add
a private key to this empty structure the functions described in
EVP_PKEY_set1_RSA(3) should be used.
RETURN VALUESEVP_PKEY_new() returns either the newly allocated EVP_PKEY structure
of NULL if an error occurred.