Streamable SHA hashes in pure javascript.

var createHash = require('sha.js')

var sha256 = createHash('sha256')
var sha512 = createHash('sha512')

var h = sha256.update('abc', 'utf8').digest('hex')
console.log(h) //ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad

//LEGACY, do not use in new systems:
var sha0 = createHash('sha')
var sha1 = createHash('sha1')

sha.js currently implements:

• sha256
• sha512
• sha1 (legacy, no not use in new systems)
• sha (legacy, no not use in new systems)

Note, this doesn't actually implement a stream, but wrapping this in a stream is trivial. but is does update incrementally, so you can hash things larger than ram, and also, since it reuses the typedarrays, it uses a constant amount of memory (except when using base64 or utf8 encoding, see code comments)

This work is derived from Paul Johnston's ["A JavaScript implementation of the Secure Hash Algorithm"] (http://pajhome.org.uk/crypt/md5/sha1.html)

MIT