mail/src/js/crypto/pbkdf2.js

/**
 * A Wrapper for Forge's PBKDF2 function
 */
define(['forge'], function(forge) {
    'use strict';

    var self = {};

    /**
     * PBKDF2-HMAC-SHA256 key derivation with a random salt and 10000 iterations
     * @param  {String} password  The password in UTF8
     * @param  {String} salt      The base64 encoded salt
     * @param  {String} keySize   The key size in bits
     * @return {String}           The base64 encoded key
     */
    self.getKey = function(password, salt, keySize) {
        var saltUtf8 = forge.util.decode64(salt);
        var md = forge.md.sha256.create();
        var key = forge.pkcs5.pbkdf2(password, saltUtf8, 10000, keySize / 8, md);

        return forge.util.encode64(key);
    };

    return self;
});