| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213 | /*CryptoJS v3.1.2code.google.com/p/crypto-js(c) 2009-2013 by Jeff Mott. All rights reserved.code.google.com/p/crypto-js/wiki/License*/(function () {    // Shortcuts    var C = CryptoJS;    var C_lib = C.lib;    var BlockCipher = C_lib.BlockCipher;    var C_algo = C.algo;    // Lookup tables    var SBOX = [];    var INV_SBOX = [];    var SUB_MIX_0 = [];    var SUB_MIX_1 = [];    var SUB_MIX_2 = [];    var SUB_MIX_3 = [];    var INV_SUB_MIX_0 = [];    var INV_SUB_MIX_1 = [];    var INV_SUB_MIX_2 = [];    var INV_SUB_MIX_3 = [];    // Compute lookup tables    (function () {        // Compute double table        var d = [];        for (var i = 0; i < 256; i++) {            if (i < 128) {                d[i] = i << 1;            } else {                d[i] = (i << 1) ^ 0x11b;            }        }        // Walk GF(2^8)        var x = 0;        var xi = 0;        for (var i = 0; i < 256; i++) {            // Compute sbox            var sx = xi ^ (xi << 1) ^ (xi << 2) ^ (xi << 3) ^ (xi << 4);            sx = (sx >>> 8) ^ (sx & 0xff) ^ 0x63;            SBOX[x] = sx;            INV_SBOX[sx] = x;            // Compute multiplication            var x2 = d[x];            var x4 = d[x2];            var x8 = d[x4];            // Compute sub bytes, mix columns tables            var t = (d[sx] * 0x101) ^ (sx * 0x1010100);            SUB_MIX_0[x] = (t << 24) | (t >>> 8);            SUB_MIX_1[x] = (t << 16) | (t >>> 16);            SUB_MIX_2[x] = (t << 8)  | (t >>> 24);            SUB_MIX_3[x] = t;            // Compute inv sub bytes, inv mix columns tables            var t = (x8 * 0x1010101) ^ (x4 * 0x10001) ^ (x2 * 0x101) ^ (x * 0x1010100);            INV_SUB_MIX_0[sx] = (t << 24) | (t >>> 8);            INV_SUB_MIX_1[sx] = (t << 16) | (t >>> 16);            INV_SUB_MIX_2[sx] = (t << 8)  | (t >>> 24);            INV_SUB_MIX_3[sx] = t;            // Compute next counter            if (!x) {                x = xi = 1;            } else {                x = x2 ^ d[d[d[x8 ^ x2]]];                xi ^= d[d[xi]];            }        }    }());    // Precomputed Rcon lookup    var RCON = [0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36];    /**     * AES block cipher algorithm.     */    var AES = C_algo.AES = BlockCipher.extend({        _doReset: function () {            // Shortcuts            var key = this._key;            var keyWords = key.words;            var keySize = key.sigBytes / 4;            // Compute number of rounds            var nRounds = this._nRounds = keySize + 6            // Compute number of key schedule rows            var ksRows = (nRounds + 1) * 4;            // Compute key schedule            var keySchedule = this._keySchedule = [];            for (var ksRow = 0; ksRow < ksRows; ksRow++) {                if (ksRow < keySize) {                    keySchedule[ksRow] = keyWords[ksRow];                } else {                    var t = keySchedule[ksRow - 1];                    if (!(ksRow % keySize)) {                        // Rot word                        t = (t << 8) | (t >>> 24);                        // Sub word                        t = (SBOX[t >>> 24] << 24) | (SBOX[(t >>> 16) & 0xff] << 16) | (SBOX[(t >>> 8) & 0xff] << 8) | SBOX[t & 0xff];                        // Mix Rcon                        t ^= RCON[(ksRow / keySize) | 0] << 24;                    } else if (keySize > 6 && ksRow % keySize == 4) {                        // Sub word                        t = (SBOX[t >>> 24] << 24) | (SBOX[(t >>> 16) & 0xff] << 16) | (SBOX[(t >>> 8) & 0xff] << 8) | SBOX[t & 0xff];                    }                    keySchedule[ksRow] = keySchedule[ksRow - keySize] ^ t;                }            }            // Compute inv key schedule            var invKeySchedule = this._invKeySchedule = [];            for (var invKsRow = 0; invKsRow < ksRows; invKsRow++) {                var ksRow = ksRows - invKsRow;                if (invKsRow % 4) {                    var t = keySchedule[ksRow];                } else {                    var t = keySchedule[ksRow - 4];                }                if (invKsRow < 4 || ksRow <= 4) {                    invKeySchedule[invKsRow] = t;                } else {                    invKeySchedule[invKsRow] = INV_SUB_MIX_0[SBOX[t >>> 24]] ^ INV_SUB_MIX_1[SBOX[(t >>> 16) & 0xff]] ^                                               INV_SUB_MIX_2[SBOX[(t >>> 8) & 0xff]] ^ INV_SUB_MIX_3[SBOX[t & 0xff]];                }            }        },        encryptBlock: function (M, offset) {            this._doCryptBlock(M, offset, this._keySchedule, SUB_MIX_0, SUB_MIX_1, SUB_MIX_2, SUB_MIX_3, SBOX);        },        decryptBlock: function (M, offset) {            // Swap 2nd and 4th rows            var t = M[offset + 1];            M[offset + 1] = M[offset + 3];            M[offset + 3] = t;            this._doCryptBlock(M, offset, this._invKeySchedule, INV_SUB_MIX_0, INV_SUB_MIX_1, INV_SUB_MIX_2, INV_SUB_MIX_3, INV_SBOX);            // Inv swap 2nd and 4th rows            var t = M[offset + 1];            M[offset + 1] = M[offset + 3];            M[offset + 3] = t;        },        _doCryptBlock: function (M, offset, keySchedule, SUB_MIX_0, SUB_MIX_1, SUB_MIX_2, SUB_MIX_3, SBOX) {            // Shortcut            var nRounds = this._nRounds;            // Get input, add round key            var s0 = M[offset]     ^ keySchedule[0];            var s1 = M[offset + 1] ^ keySchedule[1];            var s2 = M[offset + 2] ^ keySchedule[2];            var s3 = M[offset + 3] ^ keySchedule[3];            // Key schedule row counter            var ksRow = 4;            // Rounds            for (var round = 1; round < nRounds; round++) {                // Shift rows, sub bytes, mix columns, add round key                var t0 = SUB_MIX_0[s0 >>> 24] ^ SUB_MIX_1[(s1 >>> 16) & 0xff] ^ SUB_MIX_2[(s2 >>> 8) & 0xff] ^ SUB_MIX_3[s3 & 0xff] ^ keySchedule[ksRow++];                var t1 = SUB_MIX_0[s1 >>> 24] ^ SUB_MIX_1[(s2 >>> 16) & 0xff] ^ SUB_MIX_2[(s3 >>> 8) & 0xff] ^ SUB_MIX_3[s0 & 0xff] ^ keySchedule[ksRow++];                var t2 = SUB_MIX_0[s2 >>> 24] ^ SUB_MIX_1[(s3 >>> 16) & 0xff] ^ SUB_MIX_2[(s0 >>> 8) & 0xff] ^ SUB_MIX_3[s1 & 0xff] ^ keySchedule[ksRow++];                var t3 = SUB_MIX_0[s3 >>> 24] ^ SUB_MIX_1[(s0 >>> 16) & 0xff] ^ SUB_MIX_2[(s1 >>> 8) & 0xff] ^ SUB_MIX_3[s2 & 0xff] ^ keySchedule[ksRow++];                // Update state                s0 = t0;                s1 = t1;                s2 = t2;                s3 = t3;            }            // Shift rows, sub bytes, add round key            var t0 = ((SBOX[s0 >>> 24] << 24) | (SBOX[(s1 >>> 16) & 0xff] << 16) | (SBOX[(s2 >>> 8) & 0xff] << 8) | SBOX[s3 & 0xff]) ^ keySchedule[ksRow++];            var t1 = ((SBOX[s1 >>> 24] << 24) | (SBOX[(s2 >>> 16) & 0xff] << 16) | (SBOX[(s3 >>> 8) & 0xff] << 8) | SBOX[s0 & 0xff]) ^ keySchedule[ksRow++];            var t2 = ((SBOX[s2 >>> 24] << 24) | (SBOX[(s3 >>> 16) & 0xff] << 16) | (SBOX[(s0 >>> 8) & 0xff] << 8) | SBOX[s1 & 0xff]) ^ keySchedule[ksRow++];            var t3 = ((SBOX[s3 >>> 24] << 24) | (SBOX[(s0 >>> 16) & 0xff] << 16) | (SBOX[(s1 >>> 8) & 0xff] << 8) | SBOX[s2 & 0xff]) ^ keySchedule[ksRow++];            // Set output            M[offset]     = t0;            M[offset + 1] = t1;            M[offset + 2] = t2;            M[offset + 3] = t3;        },        keySize: 256/32    });    /**     * Shortcut functions to the cipher's object interface.     *     * @example     *     *     var ciphertext = CryptoJS.AES.encrypt(message, key, cfg);     *     var plaintext  = CryptoJS.AES.decrypt(ciphertext, key, cfg);     */    C.AES = BlockCipher._createHelper(AES);}());
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