_private_key() does the same as EVP_PKEY_new_raw_private_key_ex() except that the default library context and default property query are used instead. If <i>e</i> is non-NULL then the new <b>EVP_PKEY</b> structure is associated with the engine <i>e</i>. The <i>type</i> argument indicates what kind of key this is. The value should be a NID for a public key algorithm that supports raw private keys, i.e. one of <b>EVP_PKEY_X25519</b>, <b>EVP_PKEY_ED25519</b>, <b>EVP_PKEY_X448</b> or <b>EVP_PKEY_ED448</b>.</p>
