310 lines
10 KiB
JavaScript
310 lines
10 KiB
JavaScript
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/*
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CryptoJS v3.1.2
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code.google.com/p/crypto-js
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(c) 2009-2013 by Jeff Mott. All rights reserved.
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code.google.com/p/crypto-js/wiki/License
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*/
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(function (Math) {
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// Shortcuts
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var C = CryptoJS;
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var C_lib = C.lib;
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var WordArray = C_lib.WordArray;
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var Hasher = C_lib.Hasher;
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var C_x64 = C.x64;
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var X64Word = C_x64.Word;
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var C_algo = C.algo;
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// Constants tables
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var RHO_OFFSETS = [];
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var PI_INDEXES = [];
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var ROUND_CONSTANTS = [];
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// Compute Constants
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(function () {
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// Compute rho offset constants
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var x = 1, y = 0;
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for (var t = 0; t < 24; t++) {
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RHO_OFFSETS[x + 5 * y] = ((t + 1) * (t + 2) / 2) % 64;
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var newX = y % 5;
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var newY = (2 * x + 3 * y) % 5;
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x = newX;
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y = newY;
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}
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// Compute pi index constants
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for (var x = 0; x < 5; x++) {
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for (var y = 0; y < 5; y++) {
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PI_INDEXES[x + 5 * y] = y + ((2 * x + 3 * y) % 5) * 5;
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}
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}
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// Compute round constants
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var LFSR = 0x01;
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for (var i = 0; i < 24; i++) {
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var roundConstantMsw = 0;
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var roundConstantLsw = 0;
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for (var j = 0; j < 7; j++) {
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if (LFSR & 0x01) {
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var bitPosition = (1 << j) - 1;
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if (bitPosition < 32) {
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roundConstantLsw ^= 1 << bitPosition;
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} else /* if (bitPosition >= 32) */ {
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roundConstantMsw ^= 1 << (bitPosition - 32);
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}
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}
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// Compute next LFSR
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if (LFSR & 0x80) {
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// Primitive polynomial over GF(2): x^8 + x^6 + x^5 + x^4 + 1
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LFSR = (LFSR << 1) ^ 0x71;
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} else {
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LFSR <<= 1;
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}
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}
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ROUND_CONSTANTS[i] = X64Word.create(roundConstantMsw, roundConstantLsw);
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}
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}());
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// Reusable objects for temporary values
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var T = [];
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(function () {
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for (var i = 0; i < 25; i++) {
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T[i] = X64Word.create();
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}
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}());
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/**
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* SHA-3 hash algorithm.
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*/
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var SHA3 = C_algo.SHA3 = Hasher.extend({
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/**
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* Configuration options.
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*
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* @property {number} outputLength
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* The desired number of bits in the output hash.
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* Only values permitted are: 224, 256, 384, 512.
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* Default: 512
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*/
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cfg: Hasher.cfg.extend({
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outputLength: 512
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}),
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_doReset: function () {
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var state = this._state = []
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for (var i = 0; i < 25; i++) {
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state[i] = new X64Word.init();
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}
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this.blockSize = (1600 - 2 * this.cfg.outputLength) / 32;
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},
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_doProcessBlock: function (M, offset) {
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// Shortcuts
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var state = this._state;
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var nBlockSizeLanes = this.blockSize / 2;
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// Absorb
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for (var i = 0; i < nBlockSizeLanes; i++) {
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// Shortcuts
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var M2i = M[offset + 2 * i];
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var M2i1 = M[offset + 2 * i + 1];
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// Swap endian
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M2i = (
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(((M2i << 8) | (M2i >>> 24)) & 0x00ff00ff) |
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(((M2i << 24) | (M2i >>> 8)) & 0xff00ff00)
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);
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M2i1 = (
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(((M2i1 << 8) | (M2i1 >>> 24)) & 0x00ff00ff) |
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(((M2i1 << 24) | (M2i1 >>> 8)) & 0xff00ff00)
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);
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// Absorb message into state
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var lane = state[i];
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lane.high ^= M2i1;
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lane.low ^= M2i;
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}
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// Rounds
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for (var round = 0; round < 24; round++) {
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// Theta
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for (var x = 0; x < 5; x++) {
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// Mix column lanes
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var tMsw = 0, tLsw = 0;
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for (var y = 0; y < 5; y++) {
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var lane = state[x + 5 * y];
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tMsw ^= lane.high;
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tLsw ^= lane.low;
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}
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// Temporary values
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var Tx = T[x];
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Tx.high = tMsw;
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Tx.low = tLsw;
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}
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for (var x = 0; x < 5; x++) {
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// Shortcuts
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var Tx4 = T[(x + 4) % 5];
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var Tx1 = T[(x + 1) % 5];
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var Tx1Msw = Tx1.high;
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var Tx1Lsw = Tx1.low;
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// Mix surrounding columns
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var tMsw = Tx4.high ^ ((Tx1Msw << 1) | (Tx1Lsw >>> 31));
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var tLsw = Tx4.low ^ ((Tx1Lsw << 1) | (Tx1Msw >>> 31));
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for (var y = 0; y < 5; y++) {
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var lane = state[x + 5 * y];
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lane.high ^= tMsw;
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lane.low ^= tLsw;
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}
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}
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// Rho Pi
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for (var laneIndex = 1; laneIndex < 25; laneIndex++) {
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// Shortcuts
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var lane = state[laneIndex];
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var laneMsw = lane.high;
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var laneLsw = lane.low;
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var rhoOffset = RHO_OFFSETS[laneIndex];
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// Rotate lanes
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if (rhoOffset < 32) {
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var tMsw = (laneMsw << rhoOffset) | (laneLsw >>> (32 - rhoOffset));
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var tLsw = (laneLsw << rhoOffset) | (laneMsw >>> (32 - rhoOffset));
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} else /* if (rhoOffset >= 32) */ {
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var tMsw = (laneLsw << (rhoOffset - 32)) | (laneMsw >>> (64 - rhoOffset));
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var tLsw = (laneMsw << (rhoOffset - 32)) | (laneLsw >>> (64 - rhoOffset));
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}
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// Transpose lanes
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var TPiLane = T[PI_INDEXES[laneIndex]];
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TPiLane.high = tMsw;
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TPiLane.low = tLsw;
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}
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// Rho pi at x = y = 0
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var T0 = T[0];
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var state0 = state[0];
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T0.high = state0.high;
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T0.low = state0.low;
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// Chi
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for (var x = 0; x < 5; x++) {
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for (var y = 0; y < 5; y++) {
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// Shortcuts
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var laneIndex = x + 5 * y;
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var lane = state[laneIndex];
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var TLane = T[laneIndex];
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var Tx1Lane = T[((x + 1) % 5) + 5 * y];
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var Tx2Lane = T[((x + 2) % 5) + 5 * y];
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// Mix rows
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lane.high = TLane.high ^ (~Tx1Lane.high & Tx2Lane.high);
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lane.low = TLane.low ^ (~Tx1Lane.low & Tx2Lane.low);
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}
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}
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// Iota
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var lane = state[0];
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var roundConstant = ROUND_CONSTANTS[round];
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lane.high ^= roundConstant.high;
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lane.low ^= roundConstant.low;;
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}
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},
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_doFinalize: function () {
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// Shortcuts
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var data = this._data;
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var dataWords = data.words;
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var nBitsTotal = this._nDataBytes * 8;
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var nBitsLeft = data.sigBytes * 8;
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var blockSizeBits = this.blockSize * 32;
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// Add padding
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dataWords[nBitsLeft >>> 5] |= 0x1 << (24 - nBitsLeft % 32);
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dataWords[((Math.ceil((nBitsLeft + 1) / blockSizeBits) * blockSizeBits) >>> 5) - 1] |= 0x80;
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data.sigBytes = dataWords.length * 4;
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// Hash final blocks
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this._process();
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// Shortcuts
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var state = this._state;
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var outputLengthBytes = this.cfg.outputLength / 8;
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var outputLengthLanes = outputLengthBytes / 8;
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// Squeeze
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var hashWords = [];
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for (var i = 0; i < outputLengthLanes; i++) {
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// Shortcuts
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var lane = state[i];
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var laneMsw = lane.high;
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var laneLsw = lane.low;
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// Swap endian
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laneMsw = (
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(((laneMsw << 8) | (laneMsw >>> 24)) & 0x00ff00ff) |
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(((laneMsw << 24) | (laneMsw >>> 8)) & 0xff00ff00)
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);
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laneLsw = (
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(((laneLsw << 8) | (laneLsw >>> 24)) & 0x00ff00ff) |
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(((laneLsw << 24) | (laneLsw >>> 8)) & 0xff00ff00)
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);
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// Squeeze state to retrieve hash
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hashWords.push(laneLsw);
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hashWords.push(laneMsw);
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}
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// Return final computed hash
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return new WordArray.init(hashWords, outputLengthBytes);
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},
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clone: function () {
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var clone = Hasher.clone.call(this);
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var state = clone._state = this._state.slice(0);
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for (var i = 0; i < 25; i++) {
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state[i] = state[i].clone();
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}
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return clone;
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}
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});
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/**
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* Shortcut function to the hasher's object interface.
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*
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* @param {WordArray|string} message The message to hash.
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*
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* @return {WordArray} The hash.
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*
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* @static
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*
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* @example
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*
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* var hash = CryptoJS.SHA3('message');
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* var hash = CryptoJS.SHA3(wordArray);
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*/
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C.SHA3 = Hasher._createHelper(SHA3);
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/**
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* Shortcut function to the HMAC's object interface.
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*
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* @param {WordArray|string} message The message to hash.
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* @param {WordArray|string} key The secret key.
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*
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* @return {WordArray} The HMAC.
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*
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* @static
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*
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* @example
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*
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* var hmac = CryptoJS.HmacSHA3(message, key);
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*/
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C.HmacSHA3 = Hasher._createHmacHelper(SHA3);
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}(Math));
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