gistfile1.txt

var Promise = require('bluebird'),
    ie = require('int-encoder'),
    crypto = require('crypto');

var alpha = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ`~!@#$%^&*()[{]}/?=+\\|-_\'",<.>;:';

function getRandomPass(len) {
    var deferred = Promise.defer();
    var bytes = Math.ceil(Math.log(alpha.length)/Math.log(256)*len);

    crypto.randomBytes(bytes, function (ex, buf) {
        ie.alphabet(alpha);
        var hex = buf.toString('hex'),
            num = ie.encode(hex, 16);
        
        // cut off the MSB, it won't have the full range available
        deferred.resolve(num.slice(1));
    });
    return deferred.promise;
}