gistfile1.txt

var sys = require('sys'),
crypto = require('crypto'),
algos = ["sha1", "md5", "sha256", "sha512", "ripemd160"],
encoding = "hex";

algos.forEach( function( algo) {
  exports[ algo ] = function(data, salt) {
    return (typeof salt === 'undefined')
         ? crypto.createHash(algo).update(data).digest(encoding)
         : crypto.createHmac(algo, salt).update(data).digest(encoding)
  };
});