How to deal with big numbers in javascript [duplicate]

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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

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