Elight.WebUI/wwwroot/Content/crypto-js/rc4.js

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(function () {
    // Shortcuts
    var C = CryptoJS;
    var C_lib = C.lib;
    var StreamCipher = C_lib.StreamCipher;
    var C_algo = C.algo;

    /**
     * RC4 stream cipher algorithm.
     */
    var RC4 = C_algo.RC4 = StreamCipher.extend({
        _doReset: function () {
            // Shortcuts
            var key = this._key;
            var keyWords = key.words;
            var keySigBytes = key.sigBytes;

            // Init sbox
            var S = this._S = [];
            for (var i = 0; i < 256; i++) {
                S[i] = i;
            }

            // Key setup
            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;

                // Swap
                var t = S[i];
                S[i] = S[j];
                S[j] = t;
            }

            // Counters
            this._i = this._j = 0;
        },

        _doProcessBlock: function (M, offset) {
            M[offset] ^= generateKeystreamWord.call(this);
        },

        keySize: 256/32,

        ivSize: 0
    });

    function generateKeystreamWord() {
        // Shortcuts
        var S = this._S;
        var i = this._i;
        var j = this._j;

        // Generate keystream word
        var keystreamWord = 0;
        for (var n = 0; n < 4; n++) {
            i = (i + 1) % 256;
            j = (j + S[i]) % 256;