| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102 | /*CryptoJS v3.1.2code.google.com/p/crypto-js(c) 2009-2013 by Jeff Mott. All rights reserved.code.google.com/p/crypto-js/wiki/License*//** @preserve * 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;}());
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