bigi

JavaScript library to manipulate big integers. Based on jsbn by Tom Wu

Pronounced either like "big I" or "biggie".

Why?

Crypto currencies such as Bitcoin require performing mathematical operations on very large integers (256 bit). JavaScript only supports integers up to 53 bits.

Install

npm install --save bigi

Example

var BigInteger = require('bigi')

var b1 = BigInteger.fromHex("188DA80EB03090F67CBF20EB43A18800F4FF0AFD82FF1012")
var b2 = BigInteger.fromHex("07192B95FFC8DA78631011ED6B24CDD573F977A11E794811")

var b3 = b1.multiply(b2)

console.log(b3.toHex())
// => ae499bfe762edfb416d0ce71447af67ff33d1760cbebd70874be1d7a5564b0439a59808cb1856a91974f7023f72132

Methods

Instance

add

and

andNot

bitCount

byteCount

byteValue

clearBit

clone

divide

divideAndRemainder

equals

flipBit

gcd

getLowestSetBit

intValue

max

min

modInverse

modPow

multiply

not

or

pow

remainder

setBit

shiftLeft

shiftRight

shortValue

signum

subtract

testBit

toByteArray

toBuffer

toHex

xor

Class

fromBuffer()

fromHex()

Properties

Class

ONE

ZERO

Package

• issues: https://github.com/cryptocoinjs/bigi/issues
• license: BSD
• versioning: addheres to http://semver-ftw.org

Tests

• https://github.com/cryptocoinjs/bigi/blob/master/test/bigi-convert.test.js

References

• This library looks promising: https://github.com/MikeMcl/bignumber.js
• This follows the official jsbn: https://github.com/jasondavies/jsbn
• http://www.joseprio.com/blog/2013/04/27/biginteger-libraries-for-js/
• https://groups.google.com/forum/#!topic/bitcoinhackers/5IlDcTq51Y8
• https://github.com/dominictarr/math-buffer