scryptsy

scryptsy is a pure Javascript implementation of the scrypt key derivation function that is fully compatible with Node.js and the browser (via Browserify).

Why?

Scrypt is an integral part of many crypto currencies. It's a part of the BIP38 standard for encrypting private Bitcoin keys. It also serves as the proof-of-work system for many crypto currencies, most notably: Litecoin and Dogecoin.

Installation

npm install --save scryptsy

Example

var scrypt = require('scryptsy')

var key = "pleaseletmein"
var salt = "SodiumChloride"
var data = scrypt(key, salt, 16384, 8, 1, 64)
console.log(data.toString('hex'))
// => 7023bdcb3afd7348461c06cd81fd38ebfda8fbba904f8e3ea9b543f6545da1f2d5432955613f0fcf62d49705242a9af9e61e85dc0d651e40dfcf017b45575887

API

scrypt(key, salt, N, r, p, keyLenBytes, [progressCallback])

• key: The key. Either Buffer or string.
• salt: The salt. Either Buffer or string.
• N: The number of iterations. number (integer)
• r: Memory factor. number (integer)
• p: Parallelization factor. number (integer)
• keyLenBytes: The number of bytes to return. number (integer)
• progressCallback: Call callback on every 1000 ops. Passes in {current, total, percent} as first parameter to progressCallback().

Returns Buffer.

Resources

• Tarsnap Blurb on Scrypt
• Scrypt Whitepaper
• IETF Scrypt (Test vector params are incorrect.)

License

MIT