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Lua binding for openssl bn library

#include <luaBn.h>

-lluaBn -lcrypto

int luaBn_open(lua_State *L);

BIGNUM *luaBn_tobignum(lua_State *L, int narg);

local bn = require "bn"

    -- These variable exist for notation purposes only.
    local n, s, b, a = ... -- Lua "number", "string", "bn.number" type and any of these type

bn.number(n), bn.number(s) - create bignum object from Lua number or string

b:tostring(), b:__tostring() - convert bignum to string

bn.isneg(a), b:isneg() - check whether bignum value is negative

bn.isodd(a), b:isodd() - check whether bignum value is odd

bn.iseven(a), b:iseven() - check whether bignum value is even

bn.isone(a), b:isone() - check whether bignum value is equal to one

bn.iszero(a), b:iszero() - check whether bignum value is equal to zero

bn.cmp(a1, a2), b1:cmp(a2) - compare values with `BN_cmp` and return its value

bn.ucmp(a1, a2), b1:ucmp(a2) - compare absolute values with `BN_ucmp` and return its value

bn.swap(b1, b2), b1:swap(b2) - swap values of b1 and b2

b:add(a), b:sub(a), b:mul(a), b:div(a) - arithmetic operations

bn.add(a1, a2), bn.sub(a1, a2), bn.mul(a1, a2), bn.div(a1, a2) - arithmetic operations

b:modadd(a1, a2), b:modsub(a1, a2), b:modmul(a1, a2), b:moddiv(a1, ad2) - arithmetic modulo `a2` operations

bn.modadd(a1, a2, a3), bn.modsub(a1, a2, a3), bn.modmul(a1, a2, a3), bn.moddiv(a1, a2, a3) - arithmetic modulo `a3` operations