BN_POOL
static void BN_POOL_init(BN_POOL *);
static void BN_POOL_finish(BN_POOL *);
static void BN_POOL_reset(BN_POOL *);
static BIGNUM * BN_POOL_get(BN_POOL *);
static void BN_POOL_release(BN_POOL *, unsigned int);
BN_POOL pool;
BN_POOL_init(BN_POOL *p)
BN_POOL_finish(BN_POOL *p)
BN_POOL_reset(BN_POOL *p)
BN_POOL_get(BN_POOL *p)
BN_POOL_release(BN_POOL *p, unsigned int num)