pbkdf2-password 

Easy salt/password creation for Node.js, extracted from
Mosca.

Usage
-----

``js
var bkfd2Password = require("pbkdf2-password");
var hasher = bkfd2Password();
var assert = require("assert");
var opts = {
password: "helloworld"
};

hasher(opts, function(err, pass, salt, hash) {
opts.salt = salt;
hasher(opts, function(err, pass, salt, hash2) {
assert.deepEqual(hash2, hash);

// password mismatch
opts.password = "aaa";
hasher(opts, function(err, pass, salt, hash2) {
assert.notDeepEqual(hash2, hash);
console.log("OK");
});
});
});
`

API
---

* bkfd2Password
* hasher()

$3

Creates a new hasher functions, with the specified options.

Options:

* saltLength, the length of the random salt
* iterations, number of pbkdf2 iterations
* keyLength, the length of the generated keys
* digest, the digest algorithm, default 'sha1'

$3

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.

License
-------

MIT