All these functions use DER format and unencrypted keys. Applications wishing
to encrypt or decrypt private keys should use other functions such as
-d2i_PKC8PrivateKey() instead.
+d2i_PKCS8PrivateKey() instead.
If the B<*a> is not NULL when calling d2i_PrivateKey() or d2i_AutoPrivateKey()
(i.e. an existing structure is being reused) and the key format is PKCS#8