1 files changed, 40 insertions, 0 deletions
diff --git a/library/cryptojs/components/mode-ofb.js b/library/cryptojs/components/mode-ofb.js
new file mode 100644
index 000000000..942074eb1
--- /dev/null
+++ b/library/cryptojs/components/mode-ofb.js
@@ -0,0 +1,40 @@
+/*
+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;
+}());