Nodejs style crypto methods.

Nodejs style crypto methods.

var crypto = require('crypto')
var hash = crypto.createHash(<alg>)
    available algorithms: 'md5', 'sha1', 'sha256'.
hash.update(<data>)
hash.digest([<encoding>])
    available encodings: 'hex', 'base64'.

var hmac = crypto.createHmac(<alg>, <key>)
    available algorithms: 'md5', 'sha1', 'sha256'.
hmac.update(<data>)
hmac.digest([<encoding>])
    available encodings: 'hex', 'base64'.