includes/clientside/static/rijndael.js
author Dan
Thu, 21 Jun 2007 12:00:16 -0400
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/* rijndael.js      Rijndael Reference Implementation
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   Copyright (c) 2001 Fritz Schneider
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 This software is provided as-is, without express or implied warranty.  
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 Permission to use, copy, modify, distribute or sell this software, with or
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 without fee, for any purpose and by any individual or organization, is hereby
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 granted, provided that the above copyright notice and this paragraph appear 
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 in all copies. Distribution as a part of an application or binary must
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 include the above copyright notice in the documentation and/or other materials
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 provided with the application or distribution.
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   As the above disclaimer notes, you are free to use this code however you
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   want. However, I would request that you send me an email 
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   (fritz /at/ cs /dot/ ucsd /dot/ edu) to say hi if you find this code useful
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   or instructional. Seeing that people are using the code acts as 
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   encouragement for me to continue development. If you *really* want to thank
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   me you can buy the book I wrote with Thomas Powell, _JavaScript:
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   _The_Complete_Reference_ :)
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   This code is an UNOPTIMIZED REFERENCE implementation of Rijndael. 
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   If there is sufficient interest I can write an optimized (word-based, 
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   table-driven) version, although you might want to consider using a 
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   compiled language if speed is critical to your application. As it stands,
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   one run of the monte carlo test (10,000 encryptions) can take up to 
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   several minutes, depending upon your processor. You shouldn't expect more
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   than a few kilobytes per second in throughput.
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   Also note that there is very little error checking in these functions. 
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   Doing proper error checking is always a good idea, but the ideal 
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   implementation (using the instanceof operator and exceptions) requires
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   IE5+/NS6+, and I've chosen to implement this code so that it is compatible
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   with IE4/NS4. 
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   And finally, because JavaScript doesn't have an explicit byte/char data 
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   type (although JavaScript 2.0 most likely will), when I refer to "byte" 
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   in this code I generally mean "32 bit integer with value in the interval 
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   [0,255]" which I treat as a byte.
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   See http://www-cse.ucsd.edu/~fritz/rijndael.html for more documentation
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   of the (very simple) API provided by this code.
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                                               Fritz Schneider
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                                               fritz at cs.ucsd.edu
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*/
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// Rijndael parameters --  Valid values are 128, 192, or 256
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var keySizeInBits =   ( typeof AES_BITS == 'number' ) ? AES_BITS : 128;
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var blockSizeInBits = ( typeof AES_BLOCKSIZE == 'number' ) ? AES_BLOCKSIZE : 128;
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///////  You shouldn't have to modify anything below this line except for
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///////  the function getRandomBytes().
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//
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// Note: in the following code the two dimensional arrays are indexed as
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//       you would probably expect, as array[row][column]. The state arrays
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//       are 2d arrays of the form state[4][Nb].
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// The number of rounds for the cipher, indexed by [Nk][Nb]
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var roundsArray = [ ,,,,[,,,,10,, 12,, 14],, 
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                        [,,,,12,, 12,, 14],, 
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                        [,,,,14,, 14,, 14] ];
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// The number of bytes to shift by in shiftRow, indexed by [Nb][row]
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var shiftOffsets = [ ,,,,[,1, 2, 3],,[,1, 2, 3],,[,1, 3, 4] ];
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// The round constants used in subkey expansion
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var Rcon = [ 
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0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 
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0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 
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0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 
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0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 
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0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91 ];
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// Precomputed lookup table for the SBox
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var SBox = [
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 99, 124, 119, 123, 242, 107, 111, 197,  48,   1, 103,  43, 254, 215, 171, 
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118, 202, 130, 201, 125, 250,  89,  71, 240, 173, 212, 162, 175, 156, 164, 
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114, 192, 183, 253, 147,  38,  54,  63, 247, 204,  52, 165, 229, 241, 113, 
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190,  57,  74,  76,  88, 207, 208, 239, 170, 251,  67,  77,  51, 133,  69, 
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249,   2, 127,  80,  60, 159, 168,  81, 163,  64, 143, 146, 157,  56, 245, 
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188, 182, 218,  33,  16, 255, 243, 210, 205,  12,  19, 236,  95, 151,  68,  
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23,  196, 167, 126,  61, 100,  93,  25, 115,  96, 129,  79, 220,  34,  42, 
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144, 136,  70, 238, 184,  20, 222,  94,  11, 219, 224,  50,  58,  10,  73,
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  6,  36,  92, 194, 211, 172,  98, 145, 149, 228, 121, 231, 200,  55, 109, 
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141, 213,  78, 169, 108,  86, 244, 234, 101, 122, 174,   8, 186, 120,  37,  
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 46,  28, 166, 180, 198, 232, 221, 116,  31,  75, 189, 139, 138, 112,  62, 
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181, 102,  72,   3, 246,  14,  97,  53,  87, 185, 134, 193,  29, 158, 225,
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248, 152,  17, 105, 217, 142, 148, 155,  30, 135, 233, 206,  85,  40, 223,
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140, 161, 137,  13, 191, 230,  66, 104,  65, 153,  45,  15, 176,  84, 187,  
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 22 ];
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// Precomputed lookup table for the inverse SBox
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var SBoxInverse = [
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 82,   9, 106, 213,  48,  54, 165,  56, 191,  64, 163, 158, 129, 243, 215, 
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251, 124, 227,  57, 130, 155,  47, 255, 135,  52, 142,  67,  68, 196, 222, 
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233, 203,  84, 123, 148,  50, 166, 194,  35,  61, 238,  76, 149,  11,  66, 
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250, 195,  78,   8,  46, 161, 102,  40, 217,  36, 178, 118,  91, 162,  73, 
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109, 139, 209,  37, 114, 248, 246, 100, 134, 104, 152,  22, 212, 164,  92, 
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204,  93, 101, 182, 146, 108, 112,  72,  80, 253, 237, 185, 218,  94,  21,  
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 70,  87, 167, 141, 157, 132, 144, 216, 171,   0, 140, 188, 211,  10, 247, 
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228,  88,   5, 184, 179,  69,   6, 208,  44,  30, 143, 202,  63,  15,   2, 
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193, 175, 189,   3,   1,  19, 138, 107,  58, 145,  17,  65,  79, 103, 220, 
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234, 151, 242, 207, 206, 240, 180, 230, 115, 150, 172, 116,  34, 231, 173,
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 53, 133, 226, 249,  55, 232,  28, 117, 223, 110,  71, 241,  26, 113,  29, 
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 41, 197, 137, 111, 183,  98,  14, 170,  24, 190,  27, 252,  86,  62,  75, 
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198, 210, 121,  32, 154, 219, 192, 254, 120, 205,  90, 244,  31, 221, 168,
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 51, 136,   7, 199,  49, 177,  18,  16,  89,  39, 128, 236,  95,  96,  81,
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127, 169,  25, 181,  74,  13,  45, 229, 122, 159, 147, 201, 156, 239, 160,
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224,  59,  77, 174,  42, 245, 176, 200, 235, 187,  60, 131,  83, 153,  97, 
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 23,  43,   4, 126, 186, 119, 214,  38, 225, 105,  20,  99,  85,  33,  12,
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125 ];
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function str_split(string, chunklen)
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{
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  if(!chunklen) chunklen = 1;
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  ret = new Array();
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  for ( i = 0; i < string.length; i+=chunklen )
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  {
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    ret[ret.length] = string.slice(i, i+chunklen);
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  }
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  return ret;
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}
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// This method circularly shifts the array left by the number of elements
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// given in its parameter. It returns the resulting array and is used for 
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// the ShiftRow step. Note that shift() and push() could be used for a more 
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// elegant solution, but they require IE5.5+, so I chose to do it manually. 
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function cyclicShiftLeft(theArray, positions) {
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  var temp = theArray.slice(0, positions);
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  theArray = theArray.slice(positions).concat(temp);
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  return theArray;
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}
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// Cipher parameters ... do not change these
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var Nk = keySizeInBits / 32;                   
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var Nb = blockSizeInBits / 32;
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var Nr = roundsArray[Nk][Nb];
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// Multiplies the element "poly" of GF(2^8) by x. See the Rijndael spec.
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function xtime(poly) {
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  poly <<= 1;
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  return ((poly & 0x100) ? (poly ^ 0x11B) : (poly));
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}
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// Multiplies the two elements of GF(2^8) together and returns the result.
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// See the Rijndael spec, but should be straightforward: for each power of
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// the indeterminant that has a 1 coefficient in x, add y times that power
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// to the result. x and y should be bytes representing elements of GF(2^8)
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function mult_GF256(x, y) {
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  var bit, result = 0;
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  for (bit = 1; bit < 256; bit *= 2, y = xtime(y)) {
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    if (x & bit) 
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      result ^= y;
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  }
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  return result;
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}
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// Performs the substitution step of the cipher. State is the 2d array of
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// state information (see spec) and direction is string indicating whether
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// we are performing the forward substitution ("encrypt") or inverse 
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// substitution (anything else)
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function byteSub(state, direction) {
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  var S;
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  if (direction == "encrypt")           // Point S to the SBox we're using
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    S = SBox;
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  else
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    S = SBoxInverse;
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  for (var i = 0; i < 4; i++)           // Substitute for every byte in state
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    for (var j = 0; j < Nb; j++)
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       state[i][j] = S[state[i][j]];
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}
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// Performs the row shifting step of the cipher.
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function shiftRow(state, direction) {
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  for (var i=1; i<4; i++)               // Row 0 never shifts
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    if (direction == "encrypt")
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       state[i] = cyclicShiftLeft(state[i], shiftOffsets[Nb][i]);
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    else
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       state[i] = cyclicShiftLeft(state[i], Nb - shiftOffsets[Nb][i]);
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}
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// Performs the column mixing step of the cipher. Most of these steps can
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// be combined into table lookups on 32bit values (at least for encryption)
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// to greatly increase the speed. 
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function mixColumn(state, direction) {
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  var b = [];                            // Result of matrix multiplications
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  for (var j = 0; j < Nb; j++) {         // Go through each column...
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    for (var i = 0; i < 4; i++) {        // and for each row in the column...
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      if (direction == "encrypt")
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        b[i] = mult_GF256(state[i][j], 2) ^          // perform mixing
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               mult_GF256(state[(i+1)%4][j], 3) ^ 
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               state[(i+2)%4][j] ^ 
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               state[(i+3)%4][j];
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      else 
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        b[i] = mult_GF256(state[i][j], 0xE) ^ 
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               mult_GF256(state[(i+1)%4][j], 0xB) ^
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               mult_GF256(state[(i+2)%4][j], 0xD) ^
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               mult_GF256(state[(i+3)%4][j], 9);
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    }
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    for (var i = 0; i < 4; i++)          // Place result back into column
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      state[i][j] = b[i];
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  }
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}
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// Adds the current round key to the state information. Straightforward.
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function addRoundKey(state, roundKey) {
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  for (var j = 0; j < Nb; j++) {                 // Step through columns...
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    state[0][j] ^= (roundKey[j] & 0xFF);         // and XOR
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    state[1][j] ^= ((roundKey[j]>>8) & 0xFF);
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    state[2][j] ^= ((roundKey[j]>>16) & 0xFF);
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    state[3][j] ^= ((roundKey[j]>>24) & 0xFF);
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  }
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}
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// This function creates the expanded key from the input (128/192/256-bit)
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// key. The parameter key is an array of bytes holding the value of the key.
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// The returned value is an array whose elements are the 32-bit words that 
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// make up the expanded key.
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function keyExpansion(key) {
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  var expandedKey = new Array();
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  var temp;
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  // in case the key size or parameters were changed...
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  Nk = keySizeInBits / 32;                   
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  Nb = blockSizeInBits / 32;
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  Nr = roundsArray[Nk][Nb];
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  for (var j=0; j < Nk; j++)     // Fill in input key first
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    expandedKey[j] = 
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      (key[4*j]) | (key[4*j+1]<<8) | (key[4*j+2]<<16) | (key[4*j+3]<<24);
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  // Now walk down the rest of the array filling in expanded key bytes as
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  // per Rijndael's spec
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  for (j = Nk; j < Nb * (Nr + 1); j++) {    // For each word of expanded key
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    temp = expandedKey[j - 1];
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    if (j % Nk == 0) 
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      temp = ( (SBox[(temp>>8) & 0xFF]) |
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               (SBox[(temp>>16) & 0xFF]<<8) |
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               (SBox[(temp>>24) & 0xFF]<<16) |
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               (SBox[temp & 0xFF]<<24) ) ^ Rcon[Math.floor(j / Nk) - 1];
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    else if (Nk > 6 && j % Nk == 4)
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      temp = (SBox[(temp>>24) & 0xFF]<<24) |
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             (SBox[(temp>>16) & 0xFF]<<16) |
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             (SBox[(temp>>8) & 0xFF]<<8) |
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             (SBox[temp & 0xFF]);
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    expandedKey[j] = expandedKey[j-Nk] ^ temp;
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  }
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  return expandedKey;
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}
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// Rijndael's round functions... 
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function Round(state, roundKey) {
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  byteSub(state, "encrypt");
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  shiftRow(state, "encrypt");
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  mixColumn(state, "encrypt");
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  addRoundKey(state, roundKey);
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}
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function InverseRound(state, roundKey) {
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  addRoundKey(state, roundKey);
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  mixColumn(state, "decrypt");
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  shiftRow(state, "decrypt");
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  byteSub(state, "decrypt");
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}
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function FinalRound(state, roundKey) {
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  byteSub(state, "encrypt");
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  shiftRow(state, "encrypt");
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  addRoundKey(state, roundKey);
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}
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function InverseFinalRound(state, roundKey){
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  addRoundKey(state, roundKey);
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  shiftRow(state, "decrypt");
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  byteSub(state, "decrypt");  
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}
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// encrypt is the basic encryption function. It takes parameters
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// block, an array of bytes representing a plaintext block, and expandedKey,
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// an array of words representing the expanded key previously returned by
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// keyExpansion(). The ciphertext block is returned as an array of bytes.
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function encrypt(block, expandedKey) {
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  var i;  
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  if (!block || block.length*8 != blockSizeInBits)
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     return; 
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  if (!expandedKey)
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     return;
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  block = packBytes(block);
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  addRoundKey(block, expandedKey);
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  for (i=1; i<Nr; i++) 
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    Round(block, expandedKey.slice(Nb*i, Nb*(i+1)));
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  FinalRound(block, expandedKey.slice(Nb*Nr)); 
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  return unpackBytes(block);
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}
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// decrypt is the basic decryption function. It takes parameters
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// block, an array of bytes representing a ciphertext block, and expandedKey,
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// an array of words representing the expanded key previously returned by
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// keyExpansion(). The decrypted block is returned as an array of bytes.
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function decrypt(block, expandedKey) {
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  var i;
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  if (!block || block.length*8 != blockSizeInBits)
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     return;
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  if (!expandedKey)
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     return;
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  block = packBytes(block);
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  InverseFinalRound(block, expandedKey.slice(Nb*Nr)); 
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  for (i = Nr - 1; i>0; i--) 
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    InverseRound(block, expandedKey.slice(Nb*i, Nb*(i+1)));
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  addRoundKey(block, expandedKey);
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  return unpackBytes(block);
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}
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// This method takes a byte array (byteArray) and converts it to a string by
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// applying String.fromCharCode() to each value and concatenating the result.
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// The resulting string is returned. Note that this function SKIPS zero bytes
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// under the assumption that they are padding added in formatPlaintext().
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// Obviously, do not invoke this method on raw data that can contain zero
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// bytes. It is really only appropriate for printable ASCII/Latin-1 
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// values. Roll your own function for more robust functionality :)
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function byteArrayToString(byteArray) {
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  var result = "";
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  for(var i=0; i<byteArray.length; i++)
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    if (byteArray[i] != 0) 
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      result += String.fromCharCode(byteArray[i]);
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  return result;
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}
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// This function takes an array of bytes (byteArray) and converts them
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// to a hexadecimal string. Array element 0 is found at the beginning of 
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// the resulting string, high nibble first. Consecutive elements follow
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// similarly, for example [16, 255] --> "10ff". The function returns a 
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// string.
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function byteArrayToHex(byteArray) {
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  var result = "";
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  if (!byteArray)
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    return;
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  for (var i=0; i<byteArray.length; i++)
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    result += ((byteArray[i]<16) ? "0" : "") + byteArray[i].toString(16);
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  return result;
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}
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// This function converts a string containing hexadecimal digits to an 
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// array of bytes. The resulting byte array is filled in the order the
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// values occur in the string, for example "10FF" --> [16, 255]. This
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// function returns an array. 
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function hexToByteArray(hexString) {
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  /*
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  var byteArray = [];
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  if (hexString.length % 2)             // must have even length
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    return;
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  if (hexString.indexOf("0x") == 0 || hexString.indexOf("0X") == 0)
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    hexString = hexString.substring(2);
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  for (var i = 0; i<hexString.length; i += 2) 
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    byteArray[Math.floor(i/2)] = parseInt(hexString.slice(i, i+2), 16);
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  return byteArray;
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  */
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  var bytes = new Array();
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  hexString = str_split(hexString, 2);
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  //alert(hexString.toString());
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  //return false;
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  for( var i in hexString )
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  {
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    bytes[bytes.length] = parseInt(hexString[i], 16);
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  }
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  //alert(bytes.toString());
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  return bytes;
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}
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   394
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// This function packs an array of bytes into the four row form defined by
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// Rijndael. It assumes the length of the array of bytes is divisible by
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// four. Bytes are filled in according to the Rijndael spec (starting with
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// column 0, row 0 to 3). This function returns a 2d array.
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function packBytes(octets) {
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  var state = new Array();
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  if (!octets || octets.length % 4)
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    return;
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diff changeset
   404
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  state[0] = new Array();  state[1] = new Array(); 
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  state[2] = new Array();  state[3] = new Array();
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  for (var j=0; j<octets.length; j+= 4) {
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     state[0][j/4] = octets[j];
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     state[1][j/4] = octets[j+1];
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   410
     state[2][j/4] = octets[j+2];
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     state[3][j/4] = octets[j+3];
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   412
  }
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   413
  return state;  
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   414
}
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diff changeset
   415
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// This function unpacks an array of bytes from the four row format preferred
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// by Rijndael into a single 1d array of bytes. It assumes the input "packed"
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// is a packed array. Bytes are filled in according to the Rijndael spec. 
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   419
// This function returns a 1d array of bytes.
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diff changeset
   420
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function unpackBytes(packed) {
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  var result = new Array();
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   423
  for (var j=0; j<packed[0].length; j++) {
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    result[result.length] = packed[0][j];
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    result[result.length] = packed[1][j];
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   426
    result[result.length] = packed[2][j];
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    result[result.length] = packed[3][j];
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   428
  }
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   429
  return result;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   430
}
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   431
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   432
// This function takes a prospective plaintext (string or array of bytes)
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   433
// and pads it with zero bytes if its length is not a multiple of the block 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   434
// size. If plaintext is a string, it is converted to an array of bytes
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   435
// in the process. The type checking can be made much nicer using the 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   436
// instanceof operator, but this operator is not available until IE5.0 so I 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   437
// chose to use the heuristic below. 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   438
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   439
function formatPlaintext(plaintext) {
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   440
  var bpb = blockSizeInBits / 8;               // bytes per block
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   441
  var i;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   442
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   443
  // if primitive string or String instance
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   444
  if (typeof plaintext == "string" || plaintext.split) {
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   445
    // alert('AUUGH you idiot it\'s NOT A STRING ITS A '+typeof(plaintext)+'!!!');
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   446
    // return false;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   447
    plaintext = plaintext.split("");
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   448
    // Unicode issues here (ignoring high byte)
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   449
    for (i=0; i<plaintext.length; i++)
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   450
      plaintext[i] = plaintext[i].charCodeAt(0) & 0xFF;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   451
  } 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   452
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   453
  for (i = bpb - (plaintext.length % bpb); i > 0 && i < bpb; i--) 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   454
    plaintext[plaintext.length] = 0;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   455
  
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   456
  return plaintext;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   457
}
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   458
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   459
// Returns an array containing "howMany" random bytes. YOU SHOULD CHANGE THIS
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   460
// TO RETURN HIGHER QUALITY RANDOM BYTES IF YOU ARE USING THIS FOR A "REAL"
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   461
// APPLICATION.
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   462
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   463
function getRandomBytes(howMany) {
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   464
  var i;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   465
  var bytes = new Array();
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   466
  for (i=0; i<howMany; i++)
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   467
    bytes[i] = Math.round(Math.random()*255);
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   468
  return bytes;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   469
}
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   470
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   471
// rijndaelEncrypt(plaintext, key, mode)
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   472
// Encrypts the plaintext using the given key and in the given mode. 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   473
// The parameter "plaintext" can either be a string or an array of bytes. 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   474
// The parameter "key" must be an array of key bytes. If you have a hex 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   475
// string representing the key, invoke hexToByteArray() on it to convert it 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   476
// to an array of bytes. The third parameter "mode" is a string indicating
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   477
// the encryption mode to use, either "ECB" or "CBC". If the parameter is
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   478
// omitted, ECB is assumed.
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   479
// 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   480
// An array of bytes representing the cihpertext is returned. To convert 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   481
// this array to hex, invoke byteArrayToHex() on it. If you are using this 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   482
// "for real" it is a good idea to change the function getRandomBytes() to 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   483
// something that returns truly random bits.
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   484
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   485
function rijndaelEncrypt(plaintext, key, mode) {
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   486
  var expandedKey, i, aBlock;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   487
  var bpb = blockSizeInBits / 8;          // bytes per block
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   488
  var ct;                                 // ciphertext
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   489
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   490
  if (typeof plaintext != 'object' || typeof key != 'object')
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   491
  {
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   492
    alert( 'Invalid params\nplaintext: '+typeof(plaintext)+'\nkey: '+typeof(key) );
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   493
    return false;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   494
  }
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   495
  if (key.length*8 == keySizeInBits+8)
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   496
    key.length = keySizeInBits / 8;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   497
  if (key.length*8 != keySizeInBits)
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   498
  {
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   499
    alert( 'Key length is bad!\nLength: '+key.length+'\nExpected: '+keySizeInBits / 8 );
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   500
    return false;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   501
  }
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   502
  if (mode == "CBC")
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   503
    ct = getRandomBytes(bpb);             // get IV
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   504
  else {
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   505
    mode = "ECB";
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   506
    ct = new Array();
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   507
  }
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   508
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   509
  // convert plaintext to byte array and pad with zeros if necessary. 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   510
  plaintext = formatPlaintext(plaintext);
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   511
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   512
  expandedKey = keyExpansion(key);
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   513
  
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   514
  for (var block=0; block<plaintext.length / bpb; block++) {
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   515
    aBlock = plaintext.slice(block*bpb, (block+1)*bpb);
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   516
    if (mode == "CBC")
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   517
      for (var i=0; i<bpb; i++) 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   518
        aBlock[i] ^= ct[block*bpb + i];
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   519
    ct = ct.concat(encrypt(aBlock, expandedKey));
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   520
  }
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   521
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   522
  return ct;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   523
}
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   524
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   525
// rijndaelDecrypt(ciphertext, key, mode)
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   526
// Decrypts the using the given key and mode. The parameter "ciphertext" 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   527
// must be an array of bytes. The parameter "key" must be an array of key 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   528
// bytes. If you have a hex string representing the ciphertext or key, 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   529
// invoke hexToByteArray() on it to convert it to an array of bytes. The
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   530
// parameter "mode" is a string, either "CBC" or "ECB".
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   531
// 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   532
// An array of bytes representing the plaintext is returned. To convert 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   533
// this array to a hex string, invoke byteArrayToHex() on it. To convert it 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   534
// to a string of characters, you can use byteArrayToString().
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   535
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   536
function rijndaelDecrypt(ciphertext, key, mode) {
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   537
  var expandedKey;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   538
  var bpb = blockSizeInBits / 8;          // bytes per block
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   539
  var pt = new Array();                   // plaintext array
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   540
  var aBlock;                             // a decrypted block
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   541
  var block;                              // current block number
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   542
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   543
  if (!ciphertext || !key || typeof ciphertext == "string")
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   544
    return;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   545
  if (key.length*8 != keySizeInBits)
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   546
    return; 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   547
  if (!mode)
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   548
    mode = "ECB";                         // assume ECB if mode omitted
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   549
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   550
  expandedKey = keyExpansion(key);
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   551
 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   552
  // work backwards to accomodate CBC mode 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   553
  for (block=(ciphertext.length / bpb)-1; block>0; block--) {
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   554
    aBlock = 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   555
     decrypt(ciphertext.slice(block*bpb,(block+1)*bpb), expandedKey);
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   556
    if (mode == "CBC") 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   557
      for (var i=0; i<bpb; i++) 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   558
        pt[(block-1)*bpb + i] = aBlock[i] ^ ciphertext[(block-1)*bpb + i];
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   559
    else 
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   560
      pt = aBlock.concat(pt);
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   561
  }
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   562
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   563
  // do last block if ECB (skips the IV in CBC)
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   564
  if (mode == "ECB")
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   565
    pt = decrypt(ciphertext.slice(0, bpb), expandedKey).concat(pt);
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   566
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   567
  return pt;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   568
}
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   569
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   570
function stringToByteArray(text)
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   571
{
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   572
  result = new Array();
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   573
  for ( i=0; i<text.length; i++ )
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   574
  {
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   575
    result[result.length] = text.charCodeAt(i);
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   576
  }
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   577
  return result;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   578
}
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   579