corrade-nucleus-nucleons – Rev 4

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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
*/
/** @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;
}());