Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

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OTHER DEALINGS IN THE SOFTWARE.

Source

"use strict";

var crypto = require("crypto");
var async = require("async");

exports

method
module.exports()

@param: {Object}optsThe options (optional)
@param: {Function}callback

Description

Hash a password, using a hash and the pbkd2
crypto module.

Options:
- password, the password to hash.
- salt, the salt to use, as a base64 string.

If the password is left undefined, a new
10-bytes password will be generated, and converted
to base64.

If the salt is left undefined, a new salt is generated.

The callback will be called with the following arguments:
- the error, if something when wrong.
- the password.
- the salt, encoded in base64.
- the hash, encoded in base64.

Source

module.exports = function hasher() {

  var args = Array.prototype.slice.call(arguments, 0);
  var callback = args.pop();
  var opts = args.pop() || {};

  var queue = [];

  if (typeof opts.password !== 'string') {
    queue.push(genPass);
  }

  if (typeof opts.salt !== 'string') {
    queue.push(genSalt);
  } else {
    opts.salt = new Buffer(opts.salt, 'base64');
  }

  queue.push(genHash);

  queue = queue.map(function(f) {
    return async.apply(f, opts);
  });

  async.waterfall(queue, callback);
};

Mosca lib/hasher.js