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authorfriendica <info@friendica.com>2013-11-07 23:25:13 -0800
committerfriendica <info@friendica.com>2013-11-07 23:25:13 -0800
commit3a9cbcaf011f5c5d423e1cd99b43442669692129 (patch)
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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
+*/
+/**
+ * Counter block mode.
+ */
+CryptoJS.mode.CTR = (function () {
+ var CTR = CryptoJS.lib.BlockCipherMode.extend();
+
+ var Encryptor = CTR.Encryptor = CTR.extend({
+ processBlock: function (words, offset) {
+ // Shortcuts
+ var cipher = this._cipher
+ var blockSize = cipher.blockSize;
+ var iv = this._iv;
+ var counter = this._counter;
+
+ // Generate keystream
+ if (iv) {
+ counter = this._counter = iv.slice(0);
+
+ // Remove IV for subsequent blocks
+ this._iv = undefined;
+ }
+ var keystream = counter.slice(0);
+ cipher.encryptBlock(keystream, 0);
+
+ // Increment counter
+ counter[blockSize - 1] = (counter[blockSize - 1] + 1) | 0
+
+ // Encrypt
+ for (var i = 0; i < blockSize; i++) {
+ words[offset + i] ^= keystream[i];
+ }
+ }
+ });
+
+ CTR.Decryptor = Encryptor;
+
+ return CTR;
+}());