include/des.js

   1 /*
   2  * From: http://www.tero.co.uk/des/
   3  *       Paul Tero, July 2001
   4  *
   5  * Derived from Eric Young's OpenSSL C implementation (BSD-style license)
   6  *
   7  * Optimised for performance with large blocks by Michael Hayworth, November 2001
   8  * http://www.netdealing.com
   9  *
  10  * THIS SOFTWARE IS PROVIDED "AS IS" AND
  11  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  12  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  13  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  14  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  15  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  16  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  17  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  18  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  19  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  20  * SUCH DAMAGE.
  21  */
  22
  23
  24 //des
  25 //this takes the key (byte array), the message (byte array), and whether to encrypt or decrypt
  26 function des (key, message, encrypt, mode, iv, padding) {
  27   //declaring this locally speeds things up a bit
  28   var spfunction1 = new Array (0x1010400,0,0x10000,0x1010404,0x1010004,0x10404,0x4,0x10000,0x400,0x1010400,0x1010404,0x400,0x1000404,0x1010004,0x1000000,0x4,0x404,0x1000400,0x1000400,0x10400,0x10400,0x1010000,0x1010000,0x1000404,0x10004,0x1000004,0x1000004,0x10004,0,0x404,0x10404,0x1000000,0x10000,0x1010404,0x4,0x1010000,0x1010400,0x1000000,0x1000000,0x400,0x1010004,0x10000,0x10400,0x1000004,0x400,0x4,0x1000404,0x10404,0x1010404,0x10004,0x1010000,0x1000404,0x1000004,0x404,0x10404,0x1010400,0x404,0x1000400,0x1000400,0,0x10004,0x10400,0,0x1010004);
  29   var spfunction2 = new Array (-0x7fef7fe0,-0x7fff8000,0x8000,0x108020,0x100000,0x20,-0x7fefffe0,-0x7fff7fe0,-0x7fffffe0,-0x7fef7fe0,-0x7fef8000,-0x80000000,-0x7fff8000,0x100000,0x20,-0x7fefffe0,0x108000,0x100020,-0x7fff7fe0,0,-0x80000000,0x8000,0x108020,-0x7ff00000,0x100020,-0x7fffffe0,0,0x108000,0x8020,-0x7fef8000,-0x7ff00000,0x8020,0,0x108020,-0x7fefffe0,0x100000,-0x7fff7fe0,-0x7ff00000,-0x7fef8000,0x8000,-0x7ff00000,-0x7fff8000,0x20,-0x7fef7fe0,0x108020,0x20,0x8000,-0x80000000,0x8020,-0x7fef8000,0x100000,-0x7fffffe0,0x100020,-0x7fff7fe0,-0x7fffffe0,0x100020,0x108000,0,-0x7fff8000,0x8020,-0x80000000,-0x7fefffe0,-0x7fef7fe0,0x108000);
  30   var spfunction3 = new Array (0x208,0x8020200,0,0x8020008,0x8000200,0,0x20208,0x8000200,0x20008,0x8000008,0x8000008,0x20000,0x8020208,0x20008,0x8020000,0x208,0x8000000,0x8,0x8020200,0x200,0x20200,0x8020000,0x8020008,0x20208,0x8000208,0x20200,0x20000,0x8000208,0x8,0x8020208,0x200,0x8000000,0x8020200,0x8000000,0x20008,0x208,0x20000,0x8020200,0x8000200,0,0x200,0x20008,0x8020208,0x8000200,0x8000008,0x200,0,0x8020008,0x8000208,0x20000,0x8000000,0x8020208,0x8,0x20208,0x20200,0x8000008,0x8020000,0x8000208,0x208,0x8020000,0x20208,0x8,0x8020008,0x20200);
  31   var spfunction4 = new Array (0x802001,0x2081,0x2081,0x80,0x802080,0x800081,0x800001,0x2001,0,0x802000,0x802000,0x802081,0x81,0,0x800080,0x800001,0x1,0x2000,0x800000,0x802001,0x80,0x800000,0x2001,0x2080,0x800081,0x1,0x2080,0x800080,0x2000,0x802080,0x802081,0x81,0x800080,0x800001,0x802000,0x802081,0x81,0,0,0x802000,0x2080,0x800080,0x800081,0x1,0x802001,0x2081,0x2081,0x80,0x802081,0x81,0x1,0x2000,0x800001,0x2001,0x802080,0x800081,0x2001,0x2080,0x800000,0x802001,0x80,0x800000,0x2000,0x802080);
  32   var spfunction5 = new Array (0x100,0x2080100,0x2080000,0x42000100,0x80000,0x100,0x40000000,0x2080000,0x40080100,0x80000,0x2000100,0x40080100,0x42000100,0x42080000,0x80100,0x40000000,0x2000000,0x40080000,0x40080000,0,0x40000100,0x42080100,0x42080100,0x2000100,0x42080000,0x40000100,0,0x42000000,0x2080100,0x2000000,0x42000000,0x80100,0x80000,0x42000100,0x100,0x2000000,0x40000000,0x2080000,0x42000100,0x40080100,0x2000100,0x40000000,0x42080000,0x2080100,0x40080100,0x100,0x2000000,0x42080000,0x42080100,0x80100,0x42000000,0x42080100,0x2080000,0,0x40080000,0x42000000,0x80100,0x2000100,0x40000100,0x80000,0,0x40080000,0x2080100,0x40000100);
  33   var spfunction6 = new Array (0x20000010,0x20400000,0x4000,0x20404010,0x20400000,0x10,0x20404010,0x400000,0x20004000,0x404010,0x400000,0x20000010,0x400010,0x20004000,0x20000000,0x4010,0,0x400010,0x20004010,0x4000,0x404000,0x20004010,0x10,0x20400010,0x20400010,0,0x404010,0x20404000,0x4010,0x404000,0x20404000,0x20000000,0x20004000,0x10,0x20400010,0x404000,0x20404010,0x400000,0x4010,0x20000010,0x400000,0x20004000,0x20000000,0x4010,0x20000010,0x20404010,0x404000,0x20400000,0x404010,0x20404000,0,0x20400010,0x10,0x4000,0x20400000,0x404010,0x4000,0x400010,0x20004010,0,0x20404000,0x20000000,0x400010,0x20004010);
  34   var spfunction7 = new Array (0x200000,0x4200002,0x4000802,0,0x800,0x4000802,0x200802,0x4200800,0x4200802,0x200000,0,0x4000002,0x2,0x4000000,0x4200002,0x802,0x4000800,0x200802,0x200002,0x4000800,0x4000002,0x4200000,0x4200800,0x200002,0x4200000,0x800,0x802,0x4200802,0x200800,0x2,0x4000000,0x200800,0x4000000,0x200800,0x200000,0x4000802,0x4000802,0x4200002,0x4200002,0x2,0x200002,0x4000000,0x4000800,0x200000,0x4200800,0x802,0x200802,0x4200800,0x802,0x4000002,0x4200802,0x4200000,0x200800,0,0x2,0x4200802,0,0x200802,0x4200000,0x800,0x4000002,0x4000800,0x800,0x200002);
  35   var spfunction8 = new Array (0x10001040,0x1000,0x40000,0x10041040,0x10000000,0x10001040,0x40,0x10000000,0x40040,0x10040000,0x10041040,0x41000,0x10041000,0x41040,0x1000,0x40,0x10040000,0x10000040,0x10001000,0x1040,0x41000,0x40040,0x10040040,0x10041000,0x1040,0,0,0x10040040,0x10000040,0x10001000,0x41040,0x40000,0x41040,0x40000,0x10041000,0x1000,0x40,0x10040040,0x1000,0x41040,0x10001000,0x40,0x10000040,0x10040000,0x10040040,0x10000000,0x40000,0x10001040,0,0x10041040,0x40040,0x10000040,0x10040000,0x10001000,0x10001040,0,0x10041040,0x41000,0x41000,0x1040,0x1040,0x40040,0x10000000,0x10041000);
  36
  37   //create the 16 or 48 subkeys we will need
  38   var keys = des_createKeys (key);
  39   var m=0, i, j, temp, temp2, right1, right2, left, right, looping;
  40   var cbcleft, cbcleft2, cbcright, cbcright2
  41   var endloop, loopinc;
  42   var len = message.length;
  43   var chunk = 0;
  44   //set up the loops for single and triple des
  45   var iterations = keys.length == 32 ? 3 : 9; //single or triple des
  46   if (iterations == 3) {looping = encrypt ? new Array (0, 32, 2) : new Array (30, -2, -2);}
  47   else {looping = encrypt ? new Array (0, 32, 2, 62, 30, -2, 64, 96, 2) : new Array (94, 62, -2, 32, 64, 2, 30, -2, -2);}
  48
  49   //pad the message depending on the padding parameter
  50   if (padding == 2) {
  51       for (var i=0; i<8; i++) { message.push(" "); } //pad the message with spaces
  52   } else if (padding == 1) {
  53       temp = 8-(len%8);
  54       for (var i=0; i<8; i++) { message.push(temp); };
  55       if (temp==8) len+=8; //PKCS7 padding
  56   } else if (!padding) {
  57       for (var i=0; i<8; i++) { message.push(0); } //pad the message out with null bytes
  58   }
  59
  60   //store the result here
  61   result = [];
  62   tempresult = [];
  63
  64   if (mode == 1) { //CBC mode
  65     cbcleft = (iv.charCodeAt(m++) << 24) | (iv.charCodeAt(m++) << 16) | (iv.charCodeAt(m++) << 8) | iv.charCodeAt(m++);
  66     cbcright = (iv.charCodeAt(m++) << 24) | (iv.charCodeAt(m++) << 16) | (iv.charCodeAt(m++) << 8) | iv.charCodeAt(m++);
  67     m=0;
  68   }
  69
  70   //loop through each 64 bit chunk of the message
  71   while (m < len) {
  72     left = (message[m++] << 24) | (message[m++] << 16) | (message[m++] << 8) | message[m++];
  73     right = (message[m++] << 24) | (message[m++] << 16) | (message[m++] << 8) | message[m++];
  74
  75     //for Cipher Block Chaining mode, xor the message with the previous result
  76     if (mode == 1) {if (encrypt) {left ^= cbcleft; right ^= cbcright;} else {cbcleft2 = cbcleft; cbcright2 = cbcright; cbcleft = left; cbcright = right;}}
  77
  78     //first each 64 but chunk of the message must be permuted according to IP
  79     temp = ((left >>> 4) ^ right) & 0x0f0f0f0f; right ^= temp; left ^= (temp << 4);
  80     temp = ((left >>> 16) ^ right) & 0x0000ffff; right ^= temp; left ^= (temp << 16);
  81     temp = ((right >>> 2) ^ left) & 0x33333333; left ^= temp; right ^= (temp << 2);
  82     temp = ((right >>> 8) ^ left) & 0x00ff00ff; left ^= temp; right ^= (temp << 8);
  83     temp = ((left >>> 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1);
  84
  85     left = ((left << 1) | (left >>> 31));
  86     right = ((right << 1) | (right >>> 31));
  87
  88     //do this either 1 or 3 times for each chunk of the message
  89     for (j=0; j<iterations; j+=3) {
  90       endloop = looping[j+1];
  91       loopinc = looping[j+2];
  92       //now go through and perform the encryption or decryption
  93       for (i=looping[j]; i!=endloop; i+=loopinc) { //for efficiency
  94         right1 = right ^ keys[i];
  95         right2 = ((right >>> 4) | (right << 28)) ^ keys[i+1];
  96         //the result is attained by passing these bytes through the S selection functions
  97         temp = left;
  98         left = right;
  99         right = temp ^ (spfunction2[(right1 >>> 24) & 0x3f] | spfunction4[(right1 >>> 16) & 0x3f]
 100               | spfunction6[(right1 >>>  8) & 0x3f] | spfunction8[right1 & 0x3f]
 101               | spfunction1[(right2 >>> 24) & 0x3f] | spfunction3[(right2 >>> 16) & 0x3f]
 102               | spfunction5[(right2 >>>  8) & 0x3f] | spfunction7[right2 & 0x3f]);
 103       }
 104       temp = left; left = right; right = temp; //unreverse left and right
 105     } //for either 1 or 3 iterations
 106
 107     //move then each one bit to the right
 108     left = ((left >>> 1) | (left << 31));
 109     right = ((right >>> 1) | (right << 31));
 110
 111     //now perform IP-1, which is IP in the opposite direction
 112     temp = ((left >>> 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1);
 113     temp = ((right >>> 8) ^ left) & 0x00ff00ff; left ^= temp; right ^= (temp << 8);
 114     temp = ((right >>> 2) ^ left) & 0x33333333; left ^= temp; right ^= (temp << 2);
 115     temp = ((left >>> 16) ^ right) & 0x0000ffff; right ^= temp; left ^= (temp << 16);
 116     temp = ((left >>> 4) ^ right) & 0x0f0f0f0f; right ^= temp; left ^= (temp << 4);
 117
 118     //for Cipher Block Chaining mode, xor the message with the previous result
 119     if (mode == 1) {if (encrypt) {cbcleft = left; cbcright = right;} else {left ^= cbcleft2; right ^= cbcright2;}}
 120     tempresult = tempresult.concat([(left>>>24), ((left>>>16) & 0xff), ((left>>>8) & 0xff), (left & 0xff), (right>>>24), ((right>>>16) & 0xff), ((right>>>8) & 0xff), (right & 0xff)]);
 121
 122     chunk += 8;
 123     if (chunk == 512) {result = result.concat(tempresult); tempresult = []; chunk = 0;}
 124   } //for every 8 characters, or 64 bits in the message
 125
 126   //return the result as an array
 127   return result.concat(tempresult);
 128 } //end of des
 129
 130
 131
 132 //des_createKeys
 133 //this takes as input a 64 bit key (even though only 56 bits are used)
 134 //as an array of 2 integers, and returns 16 48 bit keys
 135 function des_createKeys (key) {
 136   //declaring this locally speeds things up a bit
 137   pc2bytes0  = new Array (0,0x4,0x20000000,0x20000004,0x10000,0x10004,0x20010000,0x20010004,0x200,0x204,0x20000200,0x20000204,0x10200,0x10204,0x20010200,0x20010204);
 138   pc2bytes1  = new Array (0,0x1,0x100000,0x100001,0x4000000,0x4000001,0x4100000,0x4100001,0x100,0x101,0x100100,0x100101,0x4000100,0x4000101,0x4100100,0x4100101);
 139   pc2bytes2  = new Array (0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808,0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808);
 140   pc2bytes3  = new Array (0,0x200000,0x8000000,0x8200000,0x2000,0x202000,0x8002000,0x8202000,0x20000,0x220000,0x8020000,0x8220000,0x22000,0x222000,0x8022000,0x8222000);
 141   pc2bytes4  = new Array (0,0x40000,0x10,0x40010,0,0x40000,0x10,0x40010,0x1000,0x41000,0x1010,0x41010,0x1000,0x41000,0x1010,0x41010);
 142   pc2bytes5  = new Array (0,0x400,0x20,0x420,0,0x400,0x20,0x420,0x2000000,0x2000400,0x2000020,0x2000420,0x2000000,0x2000400,0x2000020,0x2000420);
 143   pc2bytes6  = new Array (0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002,0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002);
 144   pc2bytes7  = new Array (0,0x10000,0x800,0x10800,0x20000000,0x20010000,0x20000800,0x20010800,0x20000,0x30000,0x20800,0x30800,0x20020000,0x20030000,0x20020800,0x20030800);
 145   pc2bytes8  = new Array (0,0x40000,0,0x40000,0x2,0x40002,0x2,0x40002,0x2000000,0x2040000,0x2000000,0x2040000,0x2000002,0x2040002,0x2000002,0x2040002);
 146   pc2bytes9  = new Array (0,0x10000000,0x8,0x10000008,0,0x10000000,0x8,0x10000008,0x400,0x10000400,0x408,0x10000408,0x400,0x10000400,0x408,0x10000408);
 147   pc2bytes10 = new Array (0,0x20,0,0x20,0x100000,0x100020,0x100000,0x100020,0x2000,0x2020,0x2000,0x2020,0x102000,0x102020,0x102000,0x102020);
 148   pc2bytes11 = new Array (0,0x1000000,0x200,0x1000200,0x200000,0x1200000,0x200200,0x1200200,0x4000000,0x5000000,0x4000200,0x5000200,0x4200000,0x5200000,0x4200200,0x5200200);
 149   pc2bytes12 = new Array (0,0x1000,0x8000000,0x8001000,0x80000,0x81000,0x8080000,0x8081000,0x10,0x1010,0x8000010,0x8001010,0x80010,0x81010,0x8080010,0x8081010);
 150   pc2bytes13 = new Array (0,0x4,0x100,0x104,0,0x4,0x100,0x104,0x1,0x5,0x101,0x105,0x1,0x5,0x101,0x105);
 151
 152   //how many iterations (1 for des, 3 for triple des)
 153   var iterations = key.length > 8 ? 3 : 1; //changed by Paul 16/6/2007 to use Triple DES for 9+ byte keys
 154   //stores the return keys
 155   var keys = new Array (32 * iterations);
 156   //now define the left shifts which need to be done
 157   var shifts = new Array (0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0);
 158   //other variables
 159   var lefttemp, righttemp, m=0, n=0, temp;
 160
 161   for (var j=0; j<iterations; j++) { //either 1 or 3 iterations
 162     left = (key[m++] << 24) | (key[m++] << 16) | (key[m++] << 8) | key[m++];
 163     right = (key[m++] << 24) | (key[m++] << 16) | (key[m++] << 8) | key[m++];
 164
 165     temp = ((left >>> 4) ^ right) & 0x0f0f0f0f; right ^= temp; left ^= (temp << 4);
 166     temp = ((right >>> -16) ^ left) & 0x0000ffff; left ^= temp; right ^= (temp << -16);
 167     temp = ((left >>> 2) ^ right) & 0x33333333; right ^= temp; left ^= (temp << 2);
 168     temp = ((right >>> -16) ^ left) & 0x0000ffff; left ^= temp; right ^= (temp << -16);
 169     temp = ((left >>> 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1);
 170     temp = ((right >>> 8) ^ left) & 0x00ff00ff; left ^= temp; right ^= (temp << 8);
 171     temp = ((left >>> 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1);
 172
 173     //the right side needs to be shifted and to get the last four bits of the left side
 174     temp = (left << 8) | ((right >>> 20) & 0x000000f0);
 175     //left needs to be put upside down
 176     left = (right << 24) | ((right << 8) & 0xff0000) | ((right >>> 8) & 0xff00) | ((right >>> 24) & 0xf0);
 177     right = temp;
 178
 179     //now go through and perform these shifts on the left and right keys
 180     for (var i=0; i < shifts.length; i++) {
 181       //shift the keys either one or two bits to the left
 182       if (shifts[i]) {left = (left << 2) | (left >>> 26); right = (right << 2) | (right >>> 26);}
 183       else {left = (left << 1) | (left >>> 27); right = (right << 1) | (right >>> 27);}
 184       left &= -0xf; right &= -0xf;
 185
 186       //now apply PC-2, in such a way that E is easier when encrypting or decrypting
 187       //this conversion will look like PC-2 except only the last 6 bits of each byte are used
 188       //rather than 48 consecutive bits and the order of lines will be according to
 189       //how the S selection functions will be applied: S2, S4, S6, S8, S1, S3, S5, S7
 190       lefttemp = pc2bytes0[left >>> 28] | pc2bytes1[(left >>> 24) & 0xf]
 191               | pc2bytes2[(left >>> 20) & 0xf] | pc2bytes3[(left >>> 16) & 0xf]
 192               | pc2bytes4[(left >>> 12) & 0xf] | pc2bytes5[(left >>> 8) & 0xf]
 193               | pc2bytes6[(left >>> 4) & 0xf];
 194       righttemp = pc2bytes7[right >>> 28] | pc2bytes8[(right >>> 24) & 0xf]
 195                 | pc2bytes9[(right >>> 20) & 0xf] | pc2bytes10[(right >>> 16) & 0xf]
 196                 | pc2bytes11[(right >>> 12) & 0xf] | pc2bytes12[(right >>> 8) & 0xf]
 197                 | pc2bytes13[(right >>> 4) & 0xf];
 198       temp = ((righttemp >>> 16) ^ lefttemp) & 0x0000ffff;
 199       keys[n++] = lefttemp ^ temp; keys[n++] = righttemp ^ (temp << 16);
 200     }
 201   } //for each iterations
 202   //return the keys we've created
 203   return keys;
 204 } //end of des_createKeys
 205
 206
 207
 208 ////////////////////////////// TEST //////////////////////////////
 209 function stringToHex (s) {
 210   var r = "0x";
 211   var hexes = new Array ("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f");
 212   for (var i=0; i<s.length; i++) {r += hexes [s.charCodeAt(i) >> 4] + hexes [s.charCodeAt(i) & 0xf];}
 213   return r;
 214 }
 215
 216 function hexToString (h) {
 217   var r = "";
 218   for (var i= (h.substr(0, 2)=="0x")?2:0; i<h.length; i+=2) {r += String.fromCharCode (parseInt (h.substr (i, 2), 16));}
 219   return r;
 220 }
 221
 222 /*
 223 var key = "this is a 24 byte key !!";
 224 var message = "This is a test message";
 225 var ciphertext = des (key, message, 1, 0);
 226 document.writeln ("DES Test: " + stringToHex (ciphertext));
 227 */