gistfile1.js

var crypto = require('crypto');

["sha1", "md5", "sha256", "sha512", "ripemd160"].forEach(function(algo) {
  exports[algo] = function(data, salt) {
    return crypto["createH"+(typeof salt != 'undefined' ? "mac":"ash"](algo,salt)
           .update(data).digest("hex");
  };
});