CRYPTO_EX_INDEX_EC_KEY
CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_EC_KEY, l, p, newf, dupf, freef)
CRYPTO_free_ex_data(CRYPTO_EX_INDEX_EC_KEY, ec_key, &ec_key->ex_data);
if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_EC_KEY, &dest->ex_data,
if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_EC_KEY, ret, &ret->ex_data))