Hashing password with NodeJS

hash-password.js

crypto = require('crypto');

//Iterations
iterations = 100;

//Length
length = 32;

/*
 Generate the salt
 @params {function} cb - Callback that return the generated salt
 */
generateSalt = function(cb) {
	crypto.randomBytes(32, function(err, salt) {
		cb(err, salt.toString('base64'));
	});
};

/*
 Generate the hashed password
 @params {string} password - Password to hash
 @params {string} salt - Salt use to generated the hashed password
 @params {function} cb - Callback that return the generated hash
 */
generateHash = function(password, salt, cb) {
	crypto.pbkdf2(password, salt, iterations, length, function(err, hash) {
		cb(err, hash.toString('base64'));
	});
};

/*
 Check if a password is equal to a hashed one
 @params {string} password - plain text password
 @params {string} salt - salt used to generate the hashed password
 @params {string} hash - hashed password
 @params {function} cb - return a boolean if it's equal or not
*/
isEqual = function(password, salt, hash, cb) {
	crypto.pbkdf2(password, salt, iterations, length, function(err, nhash) {
		cb(err, (nhash.toString('base64') === hash) ? true : false);
	});
};


//TEST
user = {};
//Generate the salt
generateSalt(function(err, salt) {
	user.salt = salt;
	//Generate the password
	generateHash('secret', salt, function(err, hash) {
		user.password = hash;
		//Test if the hashed password is equal to the plain text one
		isEqual('secret', salt, hash, function(err, equal) {
			if(equal) console.log('valid');
			else console.log('not valid'); //not valid of course

			console.log(user); //store this object somewhere warm
		});
	});
});