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diff --git a/library/cryptojs/components/pbkdf2.js b/library/cryptojs/components/pbkdf2.js
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+/*
+CryptoJS v3.1.2
+code.google.com/p/crypto-js
+(c) 2009-2013 by Jeff Mott. All rights reserved.
+code.google.com/p/crypto-js/wiki/License
+*/
+(function () {
+    // Shortcuts
+    var C = CryptoJS;
+    var C_lib = C.lib;
+    var Base = C_lib.Base;
+    var WordArray = C_lib.WordArray;
+    var C_algo = C.algo;
+    var SHA1 = C_algo.SHA1;
+    var HMAC = C_algo.HMAC;
+
+    /**
+     * Password-Based Key Derivation Function 2 algorithm.
+     */
+    var PBKDF2 = C_algo.PBKDF2 = Base.extend({
+        /**
+         * Configuration options.
+         *
+         * @property {number} keySize The key size in words to generate. Default: 4 (128 bits)
+         * @property {Hasher} hasher The hasher to use. Default: SHA1
+         * @property {number} iterations The number of iterations to perform. Default: 1
+         */
+        cfg: Base.extend({
+            keySize: 128/32,
+            hasher: SHA1,
+            iterations: 1
+        }),
+
+        /**
+         * Initializes a newly created key derivation function.
+         *
+         * @param {Object} cfg (Optional) The configuration options to use for the derivation.
+         *
+         * @example
+         *
+         *     var kdf = CryptoJS.algo.PBKDF2.create();
+         *     var kdf = CryptoJS.algo.PBKDF2.create({ keySize: 8 });
+         *     var kdf = CryptoJS.algo.PBKDF2.create({ keySize: 8, iterations: 1000 });
+         */
+        init: function (cfg) {
+            this.cfg = this.cfg.extend(cfg);
+        },
+
+        /**
+         * Computes the Password-Based Key Derivation Function 2.
+         *
+         * @param {WordArray|string} password The password.
+         * @param {WordArray|string} salt A salt.
+         *
+         * @return {WordArray} The derived key.
+         *
+         * @example
+         *
+         *     var key = kdf.compute(password, salt);
+         */
+        compute: function (password, salt) {
+            // Shortcut
+            var cfg = this.cfg;
+
+            // Init HMAC
+            var hmac = HMAC.create(cfg.hasher, password);
+
+            // Initial values
+            var derivedKey = WordArray.create();
+            var blockIndex = WordArray.create([0x00000001]);
+
+            // Shortcuts
+            var derivedKeyWords = derivedKey.words;
+            var blockIndexWords = blockIndex.words;
+            var keySize = cfg.keySize;
+            var iterations = cfg.iterations;
+
+            // Generate key
+            while (derivedKeyWords.length < keySize) {
+                var block = hmac.update(salt).finalize(blockIndex);
+                hmac.reset();
+
+                // Shortcuts
+                var blockWords = block.words;
+                var blockWordsLength = blockWords.length;
+
+                // Iterations
+                var intermediate = block;
+                for (var i = 1; i < iterations; i++) {
+                    intermediate = hmac.finalize(intermediate);
+                    hmac.reset();
+
+                    // Shortcut
+                    var intermediateWords = intermediate.words;
+
+                    // XOR intermediate with block
+                    for (var j = 0; j < blockWordsLength; j++) {
+                        blockWords[j] ^= intermediateWords[j];
+                    }
+                }
+
+                derivedKey.concat(block);
+                blockIndexWords[0]++;
+            }
+            derivedKey.sigBytes = keySize * 4;
+
+            return derivedKey;
+        }
+    });
+
+    /**
+     * Computes the Password-Based Key Derivation Function 2.
+     *
+     * @param {WordArray|string} password The password.
+     * @param {WordArray|string} salt A salt.
+     * @param {Object} cfg (Optional) The configuration options to use for this computation.
+     *
+     * @return {WordArray} The derived key.
+     *
+     * @static
+     *
+     * @example
+     *
+     *     var key = CryptoJS.PBKDF2(password, salt);
+     *     var key = CryptoJS.PBKDF2(password, salt, { keySize: 8 });
+     *     var key = CryptoJS.PBKDF2(password, salt, { keySize: 8, iterations: 1000 });
+     */
+    C.PBKDF2 = function (password, salt, cfg) {
+        return PBKDF2.create(cfg).compute(password, salt);
+    };
+}());