本文目錄一覽：
des是什麼演算法
DES演算法為密碼體制中的對稱密碼體制。
DES演算法為密碼體制中的對稱密碼體制，又被稱為美國數據加密標準，是1972年美國IBM公司研製的對稱密碼體制加密演算法。 明文按64位進行分組，密鑰長64位，密鑰事實上是56位參與DES運算，分組後的明文組和56位的密鑰按位替代或交換的方法形成密文組的加密方法。
des的應用領域
計算機網路通信：對計算機網路通信中的數據提供保護是DES的一項重要應用。但這些被保護的數據一般只限於民用敏感信息，即不在政府確定的保密範圍之內的信息。
電子資金傳送系統：採用DES的方法加密電子資金傳送系統中的信息，可準確、快速地傳送數據，並可較好地解決信息安全的問題。
保護用戶文件：用戶可自選密鑰對重要文件加密，防止未授權用戶竊密。
用戶識別：DES還可用於計算機用戶識別系統中。
80分求DES加密解密演算法實現的PHP源代碼
以下演算法根據js演算法移植：
?php
function des ($key, $message, $encrypt, $mode, $iv, $padding) {
$message0 = $message;
//declaring this locally speeds things up a bit
$spfunction1 = array (0x1010400,0,0×10000,0x1010404,0x1010004,0x10404,0x4,0x10000,0x400,0x1010400,0x1010404,0x400,0x1000404,0x1010004,0x1000000,0x4,0x404,0x1000400,0x1000400,0x10400,0x10400,0x1010000,0x1010000,0x1000404,0x10004,0x1000004,0x1000004,0x10004,0,0×404,0x10404,0x1000000,0x10000,0x1010404,0x4,0x1010000,0x1010400,0x1000000,0x1000000,0x400,0x1010004,0x10000,0x10400,0x1000004,0x400,0x4,0x1000404,0x10404,0x1010404,0x10004,0x1010000,0x1000404,0x1000004,0x404,0x10404,0x1010400,0x404,0x1000400,0x1000400,0,0×10004,0x10400,0,0×1010004);
$spfunction2 = 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,-0x7fffffe0,0,0×108000,0x8020,-0x7fef8000,-0x7ff00000,0x8020,0,0×108020,-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);
$spfunction3 = array (0x208,0x8020200,0,0×8020008,0x8000200,0,0×20208,0x8000200,0x20008,0x8000008,0x8000008,0x20000,0x8020208,0x20008,0x8020000,0x208,0x8000000,0x8,0x8020200,0x200,0x20200,0x8020000,0x8020008,0x20208,0x8000208,0x20200,0x20000,0x8000208,0x8,0x8020208,0x200,0x8000000,0x8020200,0x8000000,0x20008,0x208,0x20000,0x8020200,0x8000200,0,0×200,0x20008,0x8020208,0x8000200,0x8000008,0x200,0,0×8020008,0x8000208,0x20000,0x8000000,0x8020208,0x8,0x20208,0x20200,0x8000008,0x8020000,0x8000208,0x208,0x8020000,0x20208,0x8,0x8020008,0x20200);
$spfunction4 = array (0x802001,0x2081,0x2081,0x80,0x802080,0x800081,0x800001,0x2001,0,0×802000,0x802000,0x802081,0x81,0,0×800080,0x800001,0x1,0x2000,0x800000,0x802001,0x80,0x800000,0x2001,0x2080,0x800081,0x1,0x2080,0x800080,0x2000,0x802080,0x802081,0x81,0x800080,0x800001,0x802000,0x802081,0x81,0,0,0×802000,0x2080,0x800080,0x800081,0x1,0x802001,0x2081,0x2081,0x80,0x802081,0x81,0x1,0x2000,0x800001,0x2001,0x802080,0x800081,0x2001,0x2080,0x800000,0x802001,0x80,0x800000,0x2000,0x802080);
$spfunction5 = array (0x100,0x2080100,0x2080000,0x42000100,0x80000,0x100,0x40000000,0x2080000,0x40080100,0x80000,0x2000100,0x40080100,0x42000100,0x42080000,0x80100,0x40000000,0x2000000,0x40080000,0x40080000,0,0×40000100,0x42080100,0x42080100,0x2000100,0x42080000,0x40000100,0,0×42000000,0x2080100,0x2000000,0x42000000,0x80100,0x80000,0x42000100,0x100,0x2000000,0x40000000,0x2080000,0x42000100,0x40080100,0x2000100,0x40000000,0x42080000,0x2080100,0x40080100,0x100,0x2000000,0x42080000,0x42080100,0x80100,0x42000000,0x42080100,0x2080000,0,0×40080000,0x42000000,0x80100,0x2000100,0x40000100,0x80000,0,0×40080000,0x2080100,0x40000100);
$spfunction6 = array (0x20000010,0x20400000,0x4000,0x20404010,0x20400000,0x10,0x20404010,0x400000,0x20004000,0x404010,0x400000,0x20000010,0x400010,0x20004000,0x20000000,0x4010,0,0×400010,0x20004010,0x4000,0x404000,0x20004010,0x10,0x20400010,0x20400010,0,0×404010,0x20404000,0x4010,0x404000,0x20404000,0x20000000,0x20004000,0x10,0x20400010,0x404000,0x20404010,0x400000,0x4010,0x20000010,0x400000,0x20004000,0x20000000,0x4010,0x20000010,0x20404010,0x404000,0x20400000,0x404010,0x20404000,0,0×20400010,0x10,0x4000,0x20400000,0x404010,0x4000,0x400010,0x20004010,0,0×20404000,0x20000000,0x400010,0x20004010);
$spfunction7 = array (0x200000,0x4200002,0x4000802,0,0×800,0x4000802,0x200802,0x4200800,0x4200802,0x200000,0,0×4000002,0x2,0x4000000,0x4200002,0x802,0x4000800,0x200802,0x200002,0x4000800,0x4000002,0x4200000,0x4200800,0x200002,0x4200000,0x800,0x802,0x4200802,0x200800,0x2,0x4000000,0x200800,0x4000000,0x200800,0x200000,0x4000802,0x4000802,0x4200002,0x4200002,0x2,0x200002,0x4000000,0x4000800,0x200000,0x4200800,0x802,0x200802,0x4200800,0x802,0x4000002,0x4200802,0x4200000,0x200800,0,0×2,0x4200802,0,0×200802,0x4200000,0x800,0x4000002,0x4000800,0x800,0x200002);
$spfunction8 = array (0x10001040,0x1000,0x40000,0x10041040,0x10000000,0x10001040,0x40,0x10000000,0x40040,0x10040000,0x10041040,0x41000,0x10041000,0x41040,0x1000,0x40,0x10040000,0x10000040,0x10001000,0x1040,0x41000,0x40040,0x10040040,0x10041000,0x1040,0,0,0×10040040,0x10000040,0x10001000,0x41040,0x40000,0x41040,0x40000,0x10041000,0x1000,0x40,0x10040040,0x1000,0x41040,0x10001000,0x40,0x10000040,0x10040000,0x10040040,0x10000000,0x40000,0x10001040,0,0×10041040,0x40040,0x10000040,0x10040000,0x10001000,0x10001040,0,0×10041040,0x41000,0x41000,0x1040,0x1040,0x40040,0x10000000,0x10041000);
$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);
//create the 16 or 48 subkeys we will need
$keys = des_createKeys ($key);
$m=0;
$len = strlen($message);
//如果加密，則需要填充
if($encrypt==1){
if($len%8==1){
for($i=0;$i7;$i++)
$message.=chr(7);
}
if($len%8==2){
for($i=0;$i6;$i++)
$message.=chr(6);
}
if($len%8==3){
for($i=0;$i5;$i++)
$message.=chr(5);
}
if($len%8==4){
for($i=0;$i4;$i++)
$message.=chr(4);
}
if($len%8==5){
for($i=0;$i3;$i++)
$message.=chr(3);
}
if($len%8==6){
for($i=0;$i2;$i++)
$message.=chr(2);
}
if($len%8==7){
for($i=0;$i1;$i++)
$message.=chr(1);
}
if($len%8==0){
for($i=0;$i8;$i++)
$message.=chr(8);
$len = $len + 8;
}
}
echo “message:”.$message;
echo “br”;
$chunk = 0;
//set up the loops for single and triple des
$iterations = ((count($keys) == 32) ? 3 : 9); //single or triple des
if ($iterations == 3) {$looping = (($encrypt) ? array (0, 32, 2) : array (30, -2, -2));}
else {$looping = (($encrypt) ? array (0, 32, 2, 62, 30, -2, 64, 96, 2) : array (94, 62, -2, 32, 64, 2, 30, -2, -2));}
echo “3.iterations”.$iterations;
echo “br 4.looping:”;
for($ii = 0; $ii count($looping); $ii++){
echo “,”.$looping[$ii];
}
echo “br”;
//pad the message depending on the padding parameter
// if ($padding == 2) $message .= ” “; //pad the message with spaces
// else if ($padding == 1) {$temp = chr (8-($len%8)); $message .= $temp . $temp . $temp . $temp . $temp . $temp . $temp . $temp; if ($temp==8) $len+=8;} //PKCS7 padding
// else if (!$padding) $message .= (chr(0) . chr(0) . chr(0) . chr(0) . chr(0) . chr(0) . chr(0) . chr(0)); //pad the message out with null bytes
//store the result here
$result = “”;
$tempresult = “”;
if ($mode == 1) { //CBC mode
$cbcleft = (ord($iv{$m++}) 24) | (ord($iv{$m++}) 16) | (ord($iv{$m++}) 8) | ord($iv{$m++});
$cbcright = (ord($iv{$m++}) 24) | (ord($iv{$m++}) 16) | (ord($iv{$m++}) 8) | ord($iv{$m++});
$m=0;
}
echo “mode:”.$mode;
echo “br”;
echo “5.cbcleft:”.$cbcleft;
echo “br”;
echo “6.cbcright:”.$cbcright;
echo “br”;
//loop through each 64 bit chunk of the message
while ($m $len) {
$left = (ord($message{$m++}) 24) | (ord($message{$m++}) 16) | (ord($message{$m++}) 8) | ord($message{$m++});
$right = (ord($message{$m++}) 24) | (ord($message{$m++}) 16) | (ord($message{$m++}) 8) | ord($message{$m++});
//for Cipher Block Chaining mode, xor the message with the previous result
if ($mode == 1) {if ($encrypt) {$left ^= $cbcleft; $right ^= $cbcright;} else {$cbcleft2 = $cbcleft; $cbcright2 = $cbcright; $cbcleft = $left; $cbcright = $right;}}
//first each 64 but chunk of the message must be permuted according to IP
$temp = (($left 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 0xffffffff)) ^ $keys[$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;}}
$tempresult .= (chr($left24 $masks[24]) . chr(($left16 $masks[16]) 0xff) . chr(($left8 $masks[8]) 0xff) . chr($left 0xff) . chr($right24 $masks[24]) . chr(($right16 $masks[16]) 0xff) . chr(($right8 $masks[8]) 0xff) . chr($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 (0,0×4,0x20000000,0x20000004,0x10000,0x10004,0x20010000,0x20010004,0x200,0x204,0x20000200,0x20000204,0x10200,0x10204,0x20010200,0x20010204);
$pc2bytes1 = array (0,0×1,0x100000,0x100001,0x4000000,0x4000001,0x4100000,0x4100001,0x100,0x101,0x100100,0x100101,0x4000100,0x4000101,0x4100100,0x4100101);
$pc2bytes2 = array (0,0×8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808,0,0×8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808);
$pc2bytes3 = array (0,0×200000,0x8000000,0x8200000,0x2000,0x202000,0x8002000,0x8202000,0x20000,0x220000,0x8020000,0x8220000,0x22000,0x222000,0x8022000,0x8222000);
$pc2bytes4 = array (0,0×40000,0x10,0x40010,0,0×40000,0x10,0x40010,0x1000,0x41000,0x1010,0x41010,0x1000,0x41000,0x1010,0x41010);
$pc2bytes5 = array (0,0×400,0x20,0x420,0,0×400,0x20,0x420,0x2000000,0x2000400,0x2000020,0x2000420,0x2000000,0x2000400,0x2000020,0x2000420);
$pc2bytes6 = array (0,0×10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002,0,0×10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002);
$pc2bytes7 = array (0,0×10000,0x800,0x10800,0x20000000,0x20010000,0x20000800,0x20010800,0x20000,0x30000,0x20800,0x30800,0x20020000,0x20030000,0x20020800,0x20030800);
$pc2bytes8 = array (0,0×40000,0,0x40000,0x2,0x40002,0x2,0x40002,0x2000000,0x2040000,0x2000000,0x2040000,0x2000002,0x2040002,0x2000002,0x2040002);
$pc2bytes9 = array (0,0×10000000,0x8,0x10000008,0,0×10000000,0x8,0x10000008,0x400,0x10000400,0x408,0x10000408,0x400,0x10000400,0x408,0x10000408);
$pc2bytes10 = array (0,0×20,0,0x20,0x100000,0x100020,0x100000,0x100020,0x2000,0x2020,0x2000,0x2020,0x102000,0x102020,0x102000,0x102020);
$pc2bytes11 = array (0,0×1000000,0x200,0x1000200,0x200000,0x1200000,0x200200,0x1200200,0x4000000,0x5000000,0x4000200,0x5000200,0x4200000,0x5200000,0x4200200,0x5200200);
$pc2bytes12 = array (0,0×1000,0x8000000,0x8001000,0x80000,0x81000,0x8080000,0x8081000,0x10,0x1010,0x8000010,0x8001010,0x80010,0x81010,0x8080010,0x8081010);
$pc2bytes13 = array (0,0×4,0x100,0x104,0,0×4,0x100,0x104,0x1,0x5,0x101,0x105,0x1,0x5,0x101,0x105);
$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) 8) ? 3 : 1); //changed by Paul 16/6/2007 to use Triple DES for 9+ byte keys
$iterations = ((strlen($key) 24) ? 3 : 1); //changed by Paul 16/6/2007 to use Triple DES for 9+ byte keys
//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
for($ii = 0; $ii count($keys); $ii++){
echo “,”.$keys[$ii];
}
echo “br”;
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; $istrlen($s); $i++) {$r .= ($hexes [(ord($s{$i}) 4)] . $hexes [(ord($s{$i}) 0xf)]);}
return $r;
}
function hexToString ($h) {
$r = “”;
for ($i= (substr($h, 0, 2)==”0x”)?2:0; $istrlen($h); $i+=2) {$r .= chr (base_convert (substr ($h, $i, 2), 16, 10));}
return $r;
}
function idtag_des_encode($text)
{
$key = ‘12345678’;
$y=pkcs5_pad($text);
echo “y:”.$y;
echo “br /”;
$td = mcrypt_module_open(MCRYPT_DES,”,MCRYPT_MODE_CBC,”); //使用MCRYPT_DES演算法,cbc模式
$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
$ks = mcrypt_enc_get_key_size($td);
mcrypt_generic_init($td, $key, $key); //初始處理
$encrypted = mcrypt_generic($td, $y); //解密
mcrypt_generic_deinit($td); //結束
mcrypt_module_close($td);
return $encrypted;
// return base64_encode($encrypted);
}
function pkcs5_pad($text,$block=8)
{
$pad = $block – (strlen($text) % $block);
return $text . str_repeat(chr($pad), $pad);
}
$key = “12345678”;
$message = “str4”;
$ciphertext = des ($key, $message, 1, 1, $key,null);
//echo “stringToHex (ciphertext): ” . stringToHex ($ciphertext);
//echo “br /”;
echo “base64_encode(ciphertext): ” . base64_encode($ciphertext);
//echo “br /”;
//echo “encode64(ciphertext): ” . encode64($ciphertext);
//echo “br /”;
//echo “base64_encode(stringToHex (ciphertext)): ” . base64_encode(stringToHex ($ciphertext));
//echo “br /”;
//echo “stringToHex (base64_encode(ciphertext)): ” . stringToHex (idtag_des_encode($message));
echo “br /”;
echo “idtag_des_encode: ” .base64_encode(idtag_des_encode($message));
//$recovered_message = des ($key, $ciphertext, 0, 0, null,null);
//echo “\n”;
//echo “DES Test Decrypted: ” . $recovered_message;
?
des加密演算法
des加密演算法如下：
一、DES加密演算法簡介
DES(Data Encryption Standard)是目前最為流行的加密演算法之一。DES是對稱的，也就是說它使用同一個密鑰來加密和解密數據。
DES還是一種分組加密演算法，該演算法每次處理固定長度的數據段，稱之為分組。DES分組的大小是64位，如果加密的數據長度不是64位的倍數，可以按照某種具體的規則來填充位。
從本質上來說，DES的安全性依賴於虛假表象，從密碼學的術語來講就是依賴於「混亂和擴散」的原則。混亂的目的是為隱藏任何明文同密文、或者密鑰之間的關係，而擴散的目的是使明文中的有效位和密鑰一起組成儘可能多的密文。兩者結合到一起就使得安全性變得相對較高。
DES演算法具體通過對明文進行一系列的排列和替換操作來將其加密。過程的關鍵就是從給定的初始密鑰中得到16個子密鑰的函數。要加密一組明文，每個子密鑰按照順序（1-16）以一系列的位操作施加於數據上，每個子密鑰一次，一共重複16次。每一次迭代稱之為一輪。要對密文進行解密可以採用同樣的步驟，只是子密鑰是按照逆向的順序（16-1）對密文進行處理。
二、DES加密演算法加密原理
DES是採用分組加密。使用64位的分組長度和56位的密鑰長度，將64位的輸入經過一系列變換得到64位的輸出。DES演算法利用多次組合替代演算法和換位演算法，通過混淆和擴散的相互作用，把明文編輯成密碼強度很高的密文。解密則使用了相同的步驟和相同的密鑰。
64位數據為一組進行加密；
初始置換根據一張8*8的置換表，將64位的明文打亂
與56位的密鑰經16輪次迭代運算形成的初始密文
最後經過初始逆置換得到分組的最終密文
Java用Des方式加密之後，PHP怎麼解密
DES是一種標準的數據加密演算法，關於這個演算法的詳細介紹可以參考wiki和百度百科：
php中有一個擴展可以支持DES的加密演算法，是：extension=php_mcrypt.dll
在配置文件中將這個擴展打開還不能夠在windows環境下使用
需要將PHP文件夾下的 libmcrypt.dll 拷貝到系統的 system32 目錄下，這是通過phpinfo可以查看到mcrypt表示這個模塊可以正常試用了。
下面是PHP中使用DES加密解密的一個例子：
//$input – stuff to decrypt
//$key – the secret key to use
function do_mencrypt($input, $key)
{
$input = str_replace(“”n”, “”, $input);
$input = str_replace(“”t”, “”, $input);
$input = str_replace(“”r”, “”, $input);
$key = substr(md5($key), 0, 24);
$td = mcrypt_module_open(‘tripledes’, ”, ‘ecb’, ”);
$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
mcrypt_generic_init($td, $key, $iv);
$encrypted_data = mcrypt_generic($td, $input);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return trim(chop(base64_encode($encrypted_data)));
}
//$input – stuff to decrypt
//$key – the secret key to use
function do_mdecrypt($input, $key)
{
$input = str_replace(“”n”, “”, $input);
$input = str_replace(“”t”, “”, $input);
$input = str_replace(“”r”, “”, $input);
$input = trim(chop(base64_decode($input)));
$td = mcrypt_module_open(‘tripledes’, ”, ‘ecb’, ”);
$key = substr(md5($key), 0, 24);
$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
mcrypt_generic_init($td, $key, $iv);
$decrypted_data = mdecrypt_generic($td, $input);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return trim(chop($decrypted_data));
}
php怎樣用des加密演算法給介面加密
所謂的介面加密 是對介面調用的參數加密, php des加密演算法 網上有很多. 如:
如果還嫌不安全,那就制定一個token生成規則，按某些伺服器端和客戶端都擁有的共同屬性生成一個隨機串，客戶端生成這個串，伺服器收到請求也校驗這個串。.
再或者是用https方式傳輸
原創文章，作者：ZJNN，如若轉載，請註明出處：https://www.506064.com/zh-tw/n/149958.html
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