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- ;(function (root, factory, undef) {
- if (typeof exports === "object") {
-
- module.exports = exports = factory(require("./core"), require("./enc-base64"), require("./md5"), require("./evpkdf"), require("./cipher-core"));
- }
- else if (typeof define === "function" && define.amd) {
-
- define(["./core", "./enc-base64", "./md5", "./evpkdf", "./cipher-core"], factory);
- }
- else {
-
- factory(root.CryptoJS);
- }
- }(this, function (CryptoJS) {
- (function () {
-
- var C = CryptoJS;
- var C_lib = C.lib;
- var StreamCipher = C_lib.StreamCipher;
- var C_algo = C.algo;
-
- var RC4 = C_algo.RC4 = StreamCipher.extend({
- _doReset: function () {
-
- var key = this._key;
- var keyWords = key.words;
- var keySigBytes = key.sigBytes;
-
- var S = this._S = [];
- for (var i = 0; i < 256; i++) {
- S[i] = i;
- }
-
- for (var i = 0, j = 0; i < 256; i++) {
- var keyByteIndex = i % keySigBytes;
- var keyByte = (keyWords[keyByteIndex >>> 2] >>> (24 - (keyByteIndex % 4) * 8)) & 0xff;
- j = (j + S[i] + keyByte) % 256;
-
- var t = S[i];
- S[i] = S[j];
- S[j] = t;
- }
-
- this._i = this._j = 0;
- },
- _doProcessBlock: function (M, offset) {
- M[offset] ^= generateKeystreamWord.call(this);
- },
- keySize: 256/32,
- ivSize: 0
- });
- function generateKeystreamWord() {
-
- var S = this._S;
- var i = this._i;
- var j = this._j;
-
- var keystreamWord = 0;
- for (var n = 0; n < 4; n++) {
- i = (i + 1) % 256;
- j = (j + S[i]) % 256;
-
- var t = S[i];
- S[i] = S[j];
- S[j] = t;
- keystreamWord |= S[(S[i] + S[j]) % 256] << (24 - n * 8);
- }
-
- this._i = i;
- this._j = j;
- return keystreamWord;
- }
-
- C.RC4 = StreamCipher._createHelper(RC4);
-
- var RC4Drop = C_algo.RC4Drop = RC4.extend({
-
- cfg: RC4.cfg.extend({
- drop: 192
- }),
- _doReset: function () {
- RC4._doReset.call(this);
-
- for (var i = this.cfg.drop; i > 0; i--) {
- generateKeystreamWord.call(this);
- }
- }
- });
-
- C.RC4Drop = StreamCipher._createHelper(RC4Drop);
- }());
- return CryptoJS.RC4;
- }));
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