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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
+*/
+/**
+ * Output Feedback block mode.
+ */
+CryptoJS.mode.OFB = (function () {
+ var OFB = CryptoJS.lib.BlockCipherMode.extend();
+
+ var Encryptor = OFB.Encryptor = OFB.extend({
+ processBlock: function (words, offset) {
+ // Shortcuts
+ var cipher = this._cipher
+ var blockSize = cipher.blockSize;
+ var iv = this._iv;
+ var keystream = this._keystream;
+
+ // Generate keystream
+ if (iv) {
+ keystream = this._keystream = iv.slice(0);
+
+ // Remove IV for subsequent blocks
+ this._iv = undefined;
+ }
+ cipher.encryptBlock(keystream, 0);
+
+ // Encrypt
+ for (var i = 0; i < blockSize; i++) {
+ words[offset + i] ^= keystream[i];
+ }
+ }
+ });
+
+ OFB.Decryptor = Encryptor;
+
+ return OFB;
+}());