BigJSThis is my big integer library, it is built on top of the big int library built by Leemon Baird.
I built it for my own interests in cryptography. It was built as Leemon's library polluted the global scope and had a somewhat scattered design. I especially love the implementations that were done for finding primes. Enjoy!
number- the actual number, this can be a string, a JS number, or another BI object
base- this defaults to 10
// If you're using npm, otherwise BI is part of the window objects var BI = require('bigjs'); var b = new BI(16772625); //Or var b = new BI("FFEE11", 16); //If you put a BI object in the constructor a deep copy of that number is made var foo = new BI(b); //foo is now a BI object with the value 0xFFEE11
base- this also defaults to 10
var b = new BI(16772625).toString(16); //b is now the string "FFEE11"
.valueOf()this only works by translating whatever is in the big int to a JS number. It's called whenever the object is involved in a numerical operation.
var b = (new BI(10)) * 2 //b is now 20
BI.ONE == 1 BI.ZERO == 0
bits- bit size of the prime, anything over 2048bits is rather slow on most machines
probable- determines whether or not this is a true prime or a probable prime. Setting this to true means that 1 in every 2^80 numbers generated may be composite. However, it has a speed up of about 10x compared to the true prime.
BI.prime(2048) //Generates a 2048 bit true prime encapsulated in the BI object
var b = new BI(1997); b.add(19); // Returns a new big int object with a value of 2016 b.add(19, true); // Returns the current big int object, b, with its value changed to 2016
var b = new BI(2016); b.subtract(19); // Returns a new big int object with a value of 1997 b.subtract(19, true); // Returns the current big int object, b, with its value changed to 1997
var b = new BI(8); b.multiply(7); // Returns a new big int object with a value of 56 b.multiply(7, true); // Returns the current big int object, b, with its value changed to 56