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How to deal with big numbers in javascript

I'm looking for a Mathematical solution that deals with really (long, big, huge, storms) numbers. I haven't found anything yet, But I don't wanna think that this problem hasn't be solve at this time. I'm looking for an easy Number solution, like Microsoft Excel Precision (30 decimals), or a BigInteger (Java) solution. in Javascript of course.

Solution

  • While looking for an big integer library for an ElGamal crypto implementation I tested several libraries with the following results:

    I recommend this one: Tom Wu's jsbn.js (http://www-cs-students.stanford.edu/~tjw/jsbn/)

    • Comprehensive set of functions and fast

    Leemon Baird's big integer library (http://www.leemon.com/crypto/BigInt.js)

    • Comprehensive set of functions and pretty fast
    • BUT: Negative number representation is buggy!

    bignumber.js (https://github.com/MikeMcl/bignumber.js)

    • Pretty complete set of functions
    • BUT: Converting really big numbers from strings into BigNumber objects result in INFINITY

    Scheme arithmetic library for JavaScript (https://github.com/jtobey/javascript-bignum)

    • JS-Implementation of Scheme arithmetic functions
    • BUT: No function for y= x^e mod n

    I haven't tested this by myself: BigNumber (http://jsfromhell.com/classes/bignumber)

    • Functions for high precision claculations
    • BUT: It's said to be slow due to internal representation of numbers as strings