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@wwwtyro
wwwtyro committed Jul 28, 2012
1 parent 7aede8c commit 8b8da3b
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157 changes: 157 additions & 0 deletions aes.js
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/*
* jsaes version 0.1 - Copyright 2006 B. Poettering
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA
*/

// later modifications by wwwtyro@github

var aes = (function () {

var my = {};

my.Sbox = new Array(99, 124, 119, 123, 242, 107, 111, 197, 48, 1, 103, 43, 254, 215, 171, 118, 202, 130, 201, 125, 250, 89, 71, 240, 173, 212, 162, 175, 156, 164, 114, 192, 183, 253, 147, 38, 54, 63, 247, 204, 52, 165, 229, 241, 113, 216, 49, 21, 4, 199, 35, 195, 24, 150, 5, 154, 7, 18, 128, 226, 235, 39, 178, 117, 9, 131, 44, 26, 27, 110, 90, 160, 82, 59, 214, 179, 41, 227, 47, 132, 83, 209, 0, 237, 32, 252, 177, 91, 106, 203, 190, 57, 74, 76, 88, 207, 208, 239, 170, 251, 67, 77, 51, 133, 69, 249, 2, 127, 80, 60, 159, 168, 81, 163, 64, 143, 146, 157, 56, 245, 188, 182, 218, 33, 16, 255, 243, 210, 205, 12, 19, 236, 95, 151, 68, 23, 196, 167, 126, 61, 100, 93, 25, 115, 96, 129, 79, 220, 34, 42, 144, 136, 70, 238, 184, 20, 222, 94, 11, 219, 224, 50, 58, 10, 73, 6, 36, 92, 194, 211, 172, 98, 145, 149, 228, 121, 231, 200, 55, 109, 141, 213, 78, 169, 108, 86, 244, 234, 101, 122, 174, 8, 186, 120, 37, 46, 28, 166, 180, 198, 232, 221, 116, 31, 75, 189, 139, 138, 112, 62, 181, 102, 72, 3, 246, 14, 97, 53, 87, 185, 134, 193, 29, 158, 225, 248, 152, 17, 105, 217, 142, 148, 155, 30, 135, 233, 206, 85, 40, 223, 140, 161, 137, 13, 191, 230, 66, 104, 65, 153, 45, 15, 176, 84, 187, 22);

my.ShiftRowTab = new Array(0, 5, 10, 15, 4, 9, 14, 3, 8, 13, 2, 7, 12, 1, 6, 11);

my.Init = function () {
my.Sbox_Inv = new Array(256);
for (var i = 0; i < 256; i++)
my.Sbox_Inv[my.Sbox[i]] = i;

my.ShiftRowTab_Inv = new Array(16);
for (var i = 0; i < 16; i++)
my.ShiftRowTab_Inv[my.ShiftRowTab[i]] = i;

my.xtime = new Array(256);
for (var i = 0; i < 128; i++) {
my.xtime[i] = i << 1;
my.xtime[128 + i] = (i << 1) ^ 0x1b;
}
}

my.Done = function () {
delete my.Sbox_Inv;
delete my.ShiftRowTab_Inv;
delete my.xtime;
}

my.ExpandKey = function (key) {
var kl = key.length,
ks, Rcon = 1;
switch (kl) {
case 16:
ks = 16 * (10 + 1);
break;
case 24:
ks = 16 * (12 + 1);
break;
case 32:
ks = 16 * (14 + 1);
break;
default:
alert("my.ExpandKey: Only key lengths of 16, 24 or 32 bytes allowed!");
}
for (var i = kl; i < ks; i += 4) {
var temp = key.slice(i - 4, i);
if (i % kl == 0) {
temp = new Array(my.Sbox[temp[1]] ^ Rcon, my.Sbox[temp[2]], my.Sbox[temp[3]], my.Sbox[temp[0]]);
if ((Rcon <<= 1) >= 256) Rcon ^= 0x11b;
}
else if ((kl > 24) && (i % kl == 16)) temp = new Array(my.Sbox[temp[0]], my.Sbox[temp[1]], my.Sbox[temp[2]], my.Sbox[temp[3]]);
for (var j = 0; j < 4; j++)
key[i + j] = key[i + j - kl] ^ temp[j];
}
}

my.Encrypt = function (block, key) {
var l = key.length;
my.AddRoundKey(block, key.slice(0, 16));
for (var i = 16; i < l - 16; i += 16) {
my.SubBytes(block, my.Sbox);
my.ShiftRows(block, my.ShiftRowTab);
my.MixColumns(block);
my.AddRoundKey(block, key.slice(i, i + 16));
}
my.SubBytes(block, my.Sbox);
my.ShiftRows(block, my.ShiftRowTab);
my.AddRoundKey(block, key.slice(i, l));
}

my.Decrypt = function (block, key) {
var l = key.length;
my.AddRoundKey(block, key.slice(l - 16, l));
my.ShiftRows(block, my.ShiftRowTab_Inv);
my.SubBytes(block, my.Sbox_Inv);
for (var i = l - 32; i >= 16; i -= 16) {
my.AddRoundKey(block, key.slice(i, i + 16));
my.MixColumns_Inv(block);
my.ShiftRows(block, my.ShiftRowTab_Inv);
my.SubBytes(block, my.Sbox_Inv);
}
my.AddRoundKey(block, key.slice(0, 16));
}

my.SubBytes = function (state, sbox) {
for (var i = 0; i < 16; i++)
state[i] = sbox[state[i]];
}

my.AddRoundKey = function (state, rkey) {
for (var i = 0; i < 16; i++)
state[i] ^= rkey[i];
}

my.ShiftRows = function (state, shifttab) {
var h = new Array().concat(state);
for (var i = 0; i < 16; i++)
state[i] = h[shifttab[i]];
}

my.MixColumns = function (state) {
for (var i = 0; i < 16; i += 4) {
var s0 = state[i + 0],
s1 = state[i + 1];
var s2 = state[i + 2],
s3 = state[i + 3];
var h = s0 ^ s1 ^ s2 ^ s3;
state[i + 0] ^= h ^ my.xtime[s0 ^ s1];
state[i + 1] ^= h ^ my.xtime[s1 ^ s2];
state[i + 2] ^= h ^ my.xtime[s2 ^ s3];
state[i + 3] ^= h ^ my.xtime[s3 ^ s0];
}
}

my.MixColumns_Inv = function (state) {
for (var i = 0; i < 16; i += 4) {
var s0 = state[i + 0],
s1 = state[i + 1];
var s2 = state[i + 2],
s3 = state[i + 3];
var h = s0 ^ s1 ^ s2 ^ s3;
var xh = my.xtime[h];
var h1 = my.xtime[my.xtime[xh ^ s0 ^ s2]] ^ h;
var h2 = my.xtime[my.xtime[xh ^ s1 ^ s3]] ^ h;
state[i + 0] ^= h1 ^ my.xtime[s0 ^ s1];
state[i + 1] ^= h2 ^ my.xtime[s1 ^ s2];
state[i + 2] ^= h1 ^ my.xtime[s2 ^ s3];
state[i + 3] ^= h2 ^ my.xtime[s3 ^ s0];
}
}

return my;

}());
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