You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
80 lines
2.1 KiB
80 lines
2.1 KiB
2 years ago
|
;(function (root, factory, undef) {
|
||
|
|
if (typeof exports === "object") {
|
||
|
|
// CommonJS
|
||
|
|
module.exports = exports = factory(require("./core"), require("./cipher-core"));
|
||
|
|
}
|
||
|
|
else if (typeof define === "function" && define.amd) {
|
||
|
|
// AMD
|
||
|
|
define(["./core", "./cipher-core"], factory);
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
// Global (browser)
|
||
|
|
factory(root.CryptoJS);
|
||
|
|
}
|
||
|
|
}(this, function (CryptoJS) {
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Cipher Feedback block mode.
|
||
|
|
*/
|
||
|
|
CryptoJS.mode.CFB = (function () {
|
||
|
|
var CFB = CryptoJS.lib.BlockCipherMode.extend();
|
||
|
|
|
||
|
|
CFB.Encryptor = CFB.extend({
|
||
|
|
processBlock: function (words, offset) {
|
||
|
|
// Shortcuts
|
||
|
|
var cipher = this._cipher;
|
||
|
|
var blockSize = cipher.blockSize;
|
||
|
|
|
||
|
|
generateKeystreamAndEncrypt.call(this, words, offset, blockSize, cipher);
|
||
|
|
|
||
|
|
// Remember this block to use with next block
|
||
|
|
this._prevBlock = words.slice(offset, offset + blockSize);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
CFB.Decryptor = CFB.extend({
|
||
|
|
processBlock: function (words, offset) {
|
||
|
|
// Shortcuts
|
||
|
|
var cipher = this._cipher;
|
||
|
|
var blockSize = cipher.blockSize;
|
||
|
|
|
||
|
|
// Remember this block to use with next block
|
||
|
|
var thisBlock = words.slice(offset, offset + blockSize);
|
||
|
|
|
||
|
|
generateKeystreamAndEncrypt.call(this, words, offset, blockSize, cipher);
|
||
|
|
|
||
|
|
// This block becomes the previous block
|
||
|
|
this._prevBlock = thisBlock;
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
function generateKeystreamAndEncrypt(words, offset, blockSize, cipher) {
|
||
|
|
var keystream;
|
||
|
|
|
||
|
|
// Shortcut
|
||
|
|
var iv = this._iv;
|
||
|
|
|
||
|
|
// Generate keystream
|
||
|
|
if (iv) {
|
||
|
|
keystream = iv.slice(0);
|
||
|
|
|
||
|
|
// Remove IV for subsequent blocks
|
||
|
|
this._iv = undefined;
|
||
|
|
} else {
|
||
|
|
keystream = this._prevBlock;
|
||
|
|
}
|
||
|
|
cipher.encryptBlock(keystream, 0);
|
||
|
|
|
||
|
|
// Encrypt
|
||
|
|
for (var i = 0; i < blockSize; i++) {
|
||
|
|
words[offset + i] ^= keystream[i];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return CFB;
|
||
|
|
}());
|
||
|
|
|
||
|
|
|
||
|
|
return CryptoJS.mode.CFB;
|
||
|
|
|
||
|
|
}));
|