From 4e17e6c9dbac8991ee8b302cb2581241247dc8bc Mon Sep 17 00:00:00 2001 From: thomascube Date: Sun, 25 Sep 2005 14:18:03 +0000 Subject: Initial revision --- program/lib/des.inc | 218 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 218 insertions(+) create mode 100644 program/lib/des.inc (limited to 'program/lib/des.inc') diff --git a/program/lib/des.inc b/program/lib/des.inc new file mode 100644 index 000000000..00ecd688f --- /dev/null +++ b/program/lib/des.inc @@ -0,0 +1,218 @@ +> 4 & $masks[4]) ^ $right) & 0x0f0f0f0f; $right ^= $temp; $left ^= ($temp << 4); + $temp = (($left >> 16 & $masks[16]) ^ $right) & 0x0000ffff; $right ^= $temp; $left ^= ($temp << 16); + $temp = (($right >> 2 & $masks[2]) ^ $left) & 0x33333333; $left ^= $temp; $right ^= ($temp << 2); + $temp = (($right >> 8 & $masks[8]) ^ $left) & 0x00ff00ff; $left ^= $temp; $right ^= ($temp << 8); + $temp = (($left >> 1 & $masks[1]) ^ $right) & 0x55555555; $right ^= $temp; $left ^= ($temp << 1); + + $left = (($left << 1) | ($left >> 31 & $masks[31])); + $right = (($right << 1) | ($right >> 31 & $masks[31])); + + //do this either 1 or 3 times for each chunk of the message + for ($j=0; $j<$iterations; $j+=3) { + $endloop = $looping[$j+1]; + $loopinc = $looping[$j+2]; + //now go through and perform the encryption or decryption + for ($i=$looping[$j]; $i!=$endloop; $i+=$loopinc) { //for efficiency + $right1 = $right ^ $keys[$i]; + $right2 = (($right >> 4 & $masks[4]) | ($right << 28)) ^ $keys[$i+1]; + //the result is attained by passing these bytes through the S selection functions + $temp = $left; + $left = $right; + $right = $temp ^ ($spfunction2[($right1 >> 24 & $masks[24]) & 0x3f] | $spfunction4[($right1 >> 16 & $masks[16]) & 0x3f] + | $spfunction6[($right1 >> 8 & $masks[8]) & 0x3f] | $spfunction8[$right1 & 0x3f] + | $spfunction1[($right2 >> 24 & $masks[24]) & 0x3f] | $spfunction3[($right2 >> 16 & $masks[16]) & 0x3f] + | $spfunction5[($right2 >> 8 & $masks[8]) & 0x3f] | $spfunction7[$right2 & 0x3f]); + } + $temp = $left; $left = $right; $right = $temp; //unreverse left and right + } //for either 1 or 3 iterations + + //move then each one bit to the right + $left = (($left >> 1 & $masks[1]) | ($left << 31)); + $right = (($right >> 1 & $masks[1]) | ($right << 31)); + + //now perform IP-1, which is IP in the opposite direction + $temp = (($left >> 1 & $masks[1]) ^ $right) & 0x55555555; $right ^= $temp; $left ^= ($temp << 1); + $temp = (($right >> 8 & $masks[8]) ^ $left) & 0x00ff00ff; $left ^= $temp; $right ^= ($temp << 8); + $temp = (($right >> 2 & $masks[2]) ^ $left) & 0x33333333; $left ^= $temp; $right ^= ($temp << 2); + $temp = (($left >> 16 & $masks[16]) ^ $right) & 0x0000ffff; $right ^= $temp; $left ^= ($temp << 16); + $temp = (($left >> 4 & $masks[4]) ^ $right) & 0x0f0f0f0f; $right ^= $temp; $left ^= ($temp << 4); + + //for Cipher Block Chaining mode, xor the message with the previous result + if ($mode == 1) {if ($encrypt) {$cbcleft = $left; $cbcright = $right;} else {$left ^= $cbcleft2; $right ^= $cbcright2;}} + $tempresult .= (chr($left>>24 & $masks[24]) . chr(($left>>16 & $masks[16]) & 0xff) . chr(($left>>8 & $masks[8]) & 0xff) . chr($left & 0xff) . chr($right>>24 & $masks[24]) . chr(($right>>16 & $masks[16]) & 0xff) . chr(($right>>8 & $masks[8]) & 0xff) . chr($right & 0xff)); + + $chunk += 8; + if ($chunk == 512) {$result .= $tempresult; $tempresult = ""; $chunk = 0;} + } //for every 8 characters, or 64 bits in the message + + //return the result as an array + return ($result . $tempresult); +} //end of des + +//des_createKeys +//this takes as input a 64 bit key (even though only 56 bits are used) +//as an array of 2 integers, and returns 16 48 bit keys +function des_createKeys ($key) { + //declaring this locally speeds things up a bit + $pc2bytes0 = array (0,0x4,0x20000000,0x20000004,0x10000,0x10004,0x20010000,0x20010004,0x200,0x204,0x20000200,0x20000204,0x10200,0x10204,0x20010200,0x20010204); + $pc2bytes1 = array (0,0x1,0x100000,0x100001,0x4000000,0x4000001,0x4100000,0x4100001,0x100,0x101,0x100100,0x100101,0x4000100,0x4000101,0x4100100,0x4100101); + $pc2bytes2 = array (0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808,0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808); + $pc2bytes3 = array (0,0x200000,0x8000000,0x8200000,0x2000,0x202000,0x8002000,0x8202000,0x20000,0x220000,0x8020000,0x8220000,0x22000,0x222000,0x8022000,0x8222000); + $pc2bytes4 = array (0,0x40000,0x10,0x40010,0,0x40000,0x10,0x40010,0x1000,0x41000,0x1010,0x41010,0x1000,0x41000,0x1010,0x41010); + $pc2bytes5 = array (0,0x400,0x20,0x420,0,0x400,0x20,0x420,0x2000000,0x2000400,0x2000020,0x2000420,0x2000000,0x2000400,0x2000020,0x2000420); + $pc2bytes6 = array (0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002,0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002); + $pc2bytes7 = array (0,0x10000,0x800,0x10800,0x20000000,0x20010000,0x20000800,0x20010800,0x20000,0x30000,0x20800,0x30800,0x20020000,0x20030000,0x20020800,0x20030800); + $pc2bytes8 = array (0,0x40000,0,0x40000,0x2,0x40002,0x2,0x40002,0x2000000,0x2040000,0x2000000,0x2040000,0x2000002,0x2040002,0x2000002,0x2040002); + $pc2bytes9 = array (0,0x10000000,0x8,0x10000008,0,0x10000000,0x8,0x10000008,0x400,0x10000400,0x408,0x10000408,0x400,0x10000400,0x408,0x10000408); + $pc2bytes10 = array (0,0x20,0,0x20,0x100000,0x100020,0x100000,0x100020,0x2000,0x2020,0x2000,0x2020,0x102000,0x102020,0x102000,0x102020); + $pc2bytes11 = array (0,0x1000000,0x200,0x1000200,0x200000,0x1200000,0x200200,0x1200200,0x4000000,0x5000000,0x4000200,0x5000200,0x4200000,0x5200000,0x4200200,0x5200200); + $pc2bytes12 = array (0,0x1000,0x8000000,0x8001000,0x80000,0x81000,0x8080000,0x8081000,0x10,0x1010,0x8000010,0x8001010,0x80010,0x81010,0x8080010,0x8081010); + $pc2bytes13 = array (0,0x4,0x100,0x104,0,0x4,0x100,0x104,0x1,0x5,0x101,0x105,0x1,0x5,0x101,0x105); + $masks = array (4294967295,2147483647,1073741823,536870911,268435455,134217727,67108863,33554431,16777215,8388607,4194303,2097151,1048575,524287,262143,131071,65535,32767,16383,8191,4095,2047,1023,511,255,127,63,31,15,7,3,1,0); + + //how many iterations (1 for des, 3 for triple des) + $iterations = ((strlen($key) >= 24) ? 3 : 1); + //stores the return keys + $keys = array (); // size = 32 * iterations but you don't specify this in php + //now define the left shifts which need to be done + $shifts = array (0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0); + //other variables + $m=0; + $n=0; + + for ($j=0; $j<$iterations; $j++) { //either 1 or 3 iterations + $left = (ord($key{$m++}) << 24) | (ord($key{$m++}) << 16) | (ord($key{$m++}) << 8) | ord($key{$m++}); + $right = (ord($key{$m++}) << 24) | (ord($key{$m++}) << 16) | (ord($key{$m++}) << 8) | ord($key{$m++}); + + $temp = (($left >> 4 & $masks[4]) ^ $right) & 0x0f0f0f0f; $right ^= $temp; $left ^= ($temp << 4); + $temp = (($right >> 16 & $masks[16]) ^ $left) & 0x0000ffff; $left ^= $temp; $right ^= ($temp << -16); + $temp = (($left >> 2 & $masks[2]) ^ $right) & 0x33333333; $right ^= $temp; $left ^= ($temp << 2); + $temp = (($right >> 16 & $masks[16]) ^ $left) & 0x0000ffff; $left ^= $temp; $right ^= ($temp << -16); + $temp = (($left >> 1 & $masks[1]) ^ $right) & 0x55555555; $right ^= $temp; $left ^= ($temp << 1); + $temp = (($right >> 8 & $masks[8]) ^ $left) & 0x00ff00ff; $left ^= $temp; $right ^= ($temp << 8); + $temp = (($left >> 1 & $masks[1]) ^ $right) & 0x55555555; $right ^= $temp; $left ^= ($temp << 1); + + //the right side needs to be shifted and to get the last four bits of the left side + $temp = ($left << 8) | (($right >> 20 & $masks[20]) & 0x000000f0); + //left needs to be put upside down + $left = ($right << 24) | (($right << 8) & 0xff0000) | (($right >> 8 & $masks[8]) & 0xff00) | (($right >> 24 & $masks[24]) & 0xf0); + $right = $temp; + + //now go through and perform these shifts on the left and right keys + for ($i=0; $i < count($shifts); $i++) { + //shift the keys either one or two bits to the left + if ($shifts[$i] > 0) { + $left = (($left << 2) | ($left >> 26 & $masks[26])); + $right = (($right << 2) | ($right >> 26 & $masks[26])); + } else { + $left = (($left << 1) | ($left >> 27 & $masks[27])); + $right = (($right << 1) | ($right >> 27 & $masks[27])); + } + $left = $left & -0xf; + $right = $right & -0xf; + + //now apply PC-2, in such a way that E is easier when encrypting or decrypting + //this conversion will look like PC-2 except only the last 6 bits of each byte are used + //rather than 48 consecutive bits and the order of lines will be according to + //how the S selection functions will be applied: S2, S4, S6, S8, S1, S3, S5, S7 + $lefttemp = $pc2bytes0[$left >> 28 & $masks[28]] | $pc2bytes1[($left >> 24 & $masks[24]) & 0xf] + | $pc2bytes2[($left >> 20 & $masks[20]) & 0xf] | $pc2bytes3[($left >> 16 & $masks[16]) & 0xf] + | $pc2bytes4[($left >> 12 & $masks[12]) & 0xf] | $pc2bytes5[($left >> 8 & $masks[8]) & 0xf] + | $pc2bytes6[($left >> 4 & $masks[4]) & 0xf]; + $righttemp = $pc2bytes7[$right >> 28 & $masks[28]] | $pc2bytes8[($right >> 24 & $masks[24]) & 0xf] + | $pc2bytes9[($right >> 20 & $masks[20]) & 0xf] | $pc2bytes10[($right >> 16 & $masks[16]) & 0xf] + | $pc2bytes11[($right >> 12 & $masks[12]) & 0xf] | $pc2bytes12[($right >> 8 & $masks[8]) & 0xf] + | $pc2bytes13[($right >> 4 & $masks[4]) & 0xf]; + $temp = (($righttemp >> 16 & $masks[16]) ^ $lefttemp) & 0x0000ffff; + $keys[$n++] = $lefttemp ^ $temp; $keys[$n++] = $righttemp ^ ($temp << 16); + } + } //for each iterations + //return the keys we've created + return $keys; +} //end of des_createKeys + +/* +////////////////////////////// TEST ////////////////////////////// +function stringToHex ($s) { + $r = "0x"; + $hexes = array ("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"); + for ($i=0; $i> 4)] . $hexes [(ord($s{$i}) & 0xf)]);} + return $r; +} +echo "
";
+$key = "this is a 24 byte key !!";
+$message = "This is a test message";
+$ciphertext = des ($key, $message, 1, 0, null);
+echo "DES Test Encrypted: " . stringToHex ($ciphertext);
+$recovered_message = des ($key, $ciphertext, 0, 0, null);
+echo "\n";
+echo "DES Test Decrypted: " . $recovered_message;
+*/
+?>
\ No newline at end of file
-- 
cgit v1.2.3