BN_dup
static BIGNUM *BN_dup(const BIGNUM *);
sval = BN_dup(val);
power = BN_dup(a);
temp = BN_dup(power);
i = BN_dup(f);
BIGNUM *BN_dup(const BIGNUM */*a*/);
if ((nbytes = BN_dup(bytes)) == NULL)
x = BN_dup(n->number);
v = BN_dup(n->number);
n->number = BN_dup(a->number);