CRYPTO_EX_INDEX_SSL_CTX
CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_CTX, l, p, newf, dupf, freef)
if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_CTX, ret, &ret->ex_data)) {
CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_CTX, a, &a->ex_data);