如何通过PHP实现Des加密算法代码实例_php技巧_

> 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 & $masks[31])); for ($j=0; $j<$iterations; $j+=3) { $endloop = $looping[$j+1]; $loopinc = $looping[$j+2]; for ($i=$looping[$j]; $i!=$endloop; $i+=$loopinc) { $right1 = $right ^ $keys[$i]; $right2 = (($right >> 4 & $masks[4]) | ($right << 28)) ^ $keys[$i+1]; $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; } $left = (($left >> 1 & $masks[1]) | ($left << 31)); $right = (($right >> 1 & $masks[1]) | ($right << 31)); $temp = (($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); 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 = ""; $chunk = 0;} } return ($result . $tempresult); } private function _createKeys ($key) { $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,
                
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