;(function (root, factory, undef) {
|
if (typeof exports === "object") {
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// CommonJS
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module.exports = exports = factory(require("./core"), require("./cipher-core"));
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}
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else if (typeof define === "function" && define.amd) {
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// AMD
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define(["./core", "./cipher-core"], factory);
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}
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else {
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// Global (browser)
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factory(root.CryptoJS);
|
}
|
}(this, function (CryptoJS) {
|
|
/** @preserve
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* Counter block mode compatible with Dr Brian Gladman fileenc.c
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* derived from CryptoJS.mode.CTR
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* Jan Hruby jhruby.web@gmail.com
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*/
|
CryptoJS.mode.CTRGladman = (function () {
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var CTRGladman = CryptoJS.lib.BlockCipherMode.extend();
|
|
function incWord(word)
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{
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if (((word >> 24) & 0xff) === 0xff) { //overflow
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var b1 = (word >> 16)&0xff;
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var b2 = (word >> 8)&0xff;
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var b3 = word & 0xff;
|
|
if (b1 === 0xff) // overflow b1
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{
|
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;
|
}());
|
|
|
|
|
return CryptoJS.mode.CTRGladman;
|
|
}));
|
