214 lines
7.9 KiB
JavaScript
214 lines
7.9 KiB
JavaScript
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/*
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CryptoJS v3.0.2
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code.google.com/p/crypto-js
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(c) 2009-2012 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 () {
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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 BlockCipher = C_lib.BlockCipher;
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var C_algo = C.algo;
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// Lookup tables
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var SBOX = [];
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var INV_SBOX = [];
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var SUB_MIX_0 = [];
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var SUB_MIX_1 = [];
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var SUB_MIX_2 = [];
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var SUB_MIX_3 = [];
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var INV_SUB_MIX_0 = [];
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var INV_SUB_MIX_1 = [];
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var INV_SUB_MIX_2 = [];
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var INV_SUB_MIX_3 = [];
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// Compute lookup tables
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(function () {
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// Compute double table
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var d = [];
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for (var i = 0; i < 256; i++) {
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if (i < 128) {
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d[i] = i << 1;
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} else {
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d[i] = (i << 1) ^ 0x11b;
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}
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}
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// Walk GF(2^8)
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var x = 0;
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var xi = 0;
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for (var i = 0; i < 256; i++) {
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// Compute sbox
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var sx = xi ^ (xi << 1) ^ (xi << 2) ^ (xi << 3) ^ (xi << 4);
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sx = (sx >>> 8) ^ (sx & 0xff) ^ 0x63;
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SBOX[x] = sx;
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INV_SBOX[sx] = x;
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// Compute multiplication
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var x2 = d[x];
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var x4 = d[x2];
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var x8 = d[x4];
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// Compute sub bytes, mix columns tables
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var t = (d[sx] * 0x101) ^ (sx * 0x1010100);
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SUB_MIX_0[x] = (t << 24) | (t >>> 8);
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SUB_MIX_1[x] = (t << 16) | (t >>> 16);
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SUB_MIX_2[x] = (t << 8) | (t >>> 24);
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SUB_MIX_3[x] = t;
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// Compute inv sub bytes, inv mix columns tables
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var t = (x8 * 0x1010101) ^ (x4 * 0x10001) ^ (x2 * 0x101) ^ (x * 0x1010100);
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INV_SUB_MIX_0[sx] = (t << 24) | (t >>> 8);
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INV_SUB_MIX_1[sx] = (t << 16) | (t >>> 16);
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INV_SUB_MIX_2[sx] = (t << 8) | (t >>> 24);
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INV_SUB_MIX_3[sx] = t;
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// Compute next counter
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if (!x) {
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x = xi = 1;
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} else {
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x = x2 ^ d[d[d[x8 ^ x2]]];
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xi ^= d[d[xi]];
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}
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}
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}());
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// Precomputed Rcon lookup
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var RCON = [0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36];
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/**
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* AES block cipher algorithm.
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*/
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var AES = C_algo.AES = BlockCipher.extend({
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_doReset: function () {
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// Shortcuts
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var key = this._key;
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var keyWords = key.words;
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var keySize = key.sigBytes / 4;
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// Compute number of rounds
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var nRounds = this._nRounds = keySize + 6
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// Compute number of key schedule rows
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var ksRows = (nRounds + 1) * 4;
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// Compute key schedule
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var keySchedule = this._keySchedule = [];
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for (var ksRow = 0; ksRow < ksRows; ksRow++) {
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if (ksRow < keySize) {
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keySchedule[ksRow] = keyWords[ksRow];
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} else {
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var t = keySchedule[ksRow - 1];
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if (!(ksRow % keySize)) {
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// Rot word
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t = (t << 8) | (t >>> 24);
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// Sub word
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t = (SBOX[t >>> 24] << 24) | (SBOX[(t >>> 16) & 0xff] << 16) | (SBOX[(t >>> 8) & 0xff] << 8) | SBOX[t & 0xff];
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// Mix Rcon
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t ^= RCON[(ksRow / keySize) | 0] << 24;
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} else if (keySize > 6 && ksRow % keySize == 4) {
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// Sub word
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t = (SBOX[t >>> 24] << 24) | (SBOX[(t >>> 16) & 0xff] << 16) | (SBOX[(t >>> 8) & 0xff] << 8) | SBOX[t & 0xff];
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}
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keySchedule[ksRow] = keySchedule[ksRow - keySize] ^ t;
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}
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}
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// Compute inv key schedule
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var invKeySchedule = this._invKeySchedule = [];
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for (var invKsRow = 0; invKsRow < ksRows; invKsRow++) {
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var ksRow = ksRows - invKsRow;
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if (invKsRow % 4) {
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var t = keySchedule[ksRow];
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} else {
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var t = keySchedule[ksRow - 4];
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}
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if (invKsRow < 4 || ksRow <= 4) {
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invKeySchedule[invKsRow] = t;
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} else {
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invKeySchedule[invKsRow] = INV_SUB_MIX_0[SBOX[t >>> 24]] ^ INV_SUB_MIX_1[SBOX[(t >>> 16) & 0xff]] ^
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INV_SUB_MIX_2[SBOX[(t >>> 8) & 0xff]] ^ INV_SUB_MIX_3[SBOX[t & 0xff]];
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}
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}
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},
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encryptBlock: function (M, offset) {
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this._doCryptBlock(M, offset, this._keySchedule, SUB_MIX_0, SUB_MIX_1, SUB_MIX_2, SUB_MIX_3, SBOX);
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},
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decryptBlock: function (M, offset) {
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// Swap 2nd and 4th rows
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var t = M[offset + 1];
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M[offset + 1] = M[offset + 3];
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M[offset + 3] = t;
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this._doCryptBlock(M, offset, this._invKeySchedule, INV_SUB_MIX_0, INV_SUB_MIX_1, INV_SUB_MIX_2, INV_SUB_MIX_3, INV_SBOX);
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// Inv swap 2nd and 4th rows
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var t = M[offset + 1];
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M[offset + 1] = M[offset + 3];
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M[offset + 3] = t;
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},
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_doCryptBlock: function (M, offset, keySchedule, SUB_MIX_0, SUB_MIX_1, SUB_MIX_2, SUB_MIX_3, SBOX) {
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// Shortcut
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var nRounds = this._nRounds;
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// Get input, add round key
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var s0 = M[offset] ^ keySchedule[0];
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var s1 = M[offset + 1] ^ keySchedule[1];
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var s2 = M[offset + 2] ^ keySchedule[2];
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var s3 = M[offset + 3] ^ keySchedule[3];
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// Key schedule row counter
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var ksRow = 4;
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// Rounds
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for (var round = 1; round < nRounds; round++) {
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// Shift rows, sub bytes, mix columns, add round key
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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++];
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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++];
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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++];
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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++];
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// Update state
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s0 = t0;
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s1 = t1;
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s2 = t2;
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s3 = t3;
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}
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// Shift rows, sub bytes, add round key
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var t0 = ((SBOX[s0 >>> 24] << 24) | (SBOX[(s1 >>> 16) & 0xff] << 16) | (SBOX[(s2 >>> 8) & 0xff] << 8) | SBOX[s3 & 0xff]) ^ keySchedule[ksRow++];
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var t1 = ((SBOX[s1 >>> 24] << 24) | (SBOX[(s2 >>> 16) & 0xff] << 16) | (SBOX[(s3 >>> 8) & 0xff] << 8) | SBOX[s0 & 0xff]) ^ keySchedule[ksRow++];
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var t2 = ((SBOX[s2 >>> 24] << 24) | (SBOX[(s3 >>> 16) & 0xff] << 16) | (SBOX[(s0 >>> 8) & 0xff] << 8) | SBOX[s1 & 0xff]) ^ keySchedule[ksRow++];
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var t3 = ((SBOX[s3 >>> 24] << 24) | (SBOX[(s0 >>> 16) & 0xff] << 16) | (SBOX[(s1 >>> 8) & 0xff] << 8) | SBOX[s2 & 0xff]) ^ keySchedule[ksRow++];
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// Set output
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M[offset] = t0;
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M[offset + 1] = t1;
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M[offset + 2] = t2;
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M[offset + 3] = t3;
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},
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keySize: 256/32
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});
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/**
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* Shortcut functions to the cipher's object interface.
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*
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* @example
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*
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* var ciphertext = CryptoJS.AES.encrypt(message, key, cfg);
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* var plaintext = CryptoJS.AES.decrypt(ciphertext, key, cfg);
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*/
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C.AES = BlockCipher._createHelper(AES);
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}());
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