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-rw-r--r--library/cryptojs/components/mode-ctr.js44
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diff --git a/library/cryptojs/components/mode-ctr.js b/library/cryptojs/components/mode-ctr.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
-*/
-/**
- * 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;
-}());