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src/js/lib/cryptojs/mode-ctr-gladman.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
+*/
+/** @license
+========================================================================
+  CryptoJS.mode.CTRGladman
+  Counter block mode compatible with  Dr Brian Gladman fileenc.c
+  derived from CryptoJS.mode.CTR 
+  Jan Hruby jhruby.web@gmail.com
+*/
+CryptoJS.mode.CTRGladman = (function () {
+    var CTRGladman = CryptoJS.lib.BlockCipherMode.extend();
+
+	function incWord(word)
+	{	
+		if (((word >> 24) & 0xff) === 0xff) { //overflow
+		var b1 = (word >> 16)&0xff;
+		var b2 = (word >> 8)&0xff;
+		var b3 = word & 0xff;
+
+		if (b1 === 0xff) // overflow b1
+		{		 
+		b1 = 0;
+		if (b2 === 0xff)
+		{
+			b2 = 0;
+			if (b3 === 0xff)
+			{
+				b3 = 0;
+			}
+			else
+			{
+				++b3;
+			}
+		}
+		else
+		{
+			++b2;
+		}
+		}
+		else
+		{
+		++b1;
+		}
+
+		word = 0;	  	  
+		word += (b1 << 16);
+		word += (b2 << 8);
+		word += b3;	  
+		}
+		else
+		{
+		word += (0x01 << 24);
+		}
+		return word;
+	}
+
+	function incCounter(counter)
+	{
+		if ((counter[0] = incWord(counter[0])) === 0)
+		{
+			// encr_data in fileenc.c from  Dr Brian Gladman's counts only with DWORD j < 8
+			counter[1] = incWord(counter[1]);
+		}
+		return counter;
+	}
+	
+    var Encryptor = CTRGladman.Encryptor = CTRGladman.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;
+            }
+            
+			incCounter(counter);
+			
+			var keystream = counter.slice(0);
+            cipher.encryptBlock(keystream, 0);
+
+            // Encrypt
+            for (var i = 0; i < blockSize; i++) {
+                words[offset + i] ^= keystream[i];
+            }
+        }
+    });
+
+    CTRGladman.Decryptor = Encryptor;
+
+    return CTRGladman;
+}());
+
+