xsalsa20

XSalsa20 implemented in Javascript and WebAssembly.

``
npm install xsalsa20
`

![build status](https://travis-ci.org/mafintosh/xsalsa20)

Usage

` js
var crypto = require('crypto')
var xsalsa20 = require('xsalsa20')
var key = crypto.randomBytes(32)
var nonce = crypto.randomBytes(24)

var xor = xsalsa20(nonce, key)

console.log(xor.update(Buffer.from('hello')))
console.log(xor.update(Buffer.from('world')))

xor.finalize()
`

API

#### var xor = xsalsa20(nonce, key)

Create a new xor instance.

Nonce should be a 24 byte buffer/uint8array and key should be 32 bytes.

#### var output = xor.update(input, [output])

Update the xor instance with a new input buffer. Optionally you can pass in an output buffer.

#### xor.finalize()

Call this method last. Clears internal state.

Contributing

The bulk of this module is implemented in WebAssembly in the xsalsa20.wat file. To build the thin Javascript wrapper do:

`
npm run compile
``

License

MIT