这篇文章主要介绍了如何通过PHP实现Des加密算法代码实例,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

如何通过PHP实现Des加密算法代码实例

注：php7以上不支持了，因为php7去掉了某些函数， 另外变量的{}要改为[]

1. <?php 
2. class Des 
3. { 
4.  /** 
5.   * 加密方法 
6.   * 
7.   * @param string $str  需要加密的内容 
8.   * @param string $key  密钥 
9.   * @param bool $toBase64 是否base64 
10.   * return string 
11.   */ 
12.     public function encrypt($str, $key, $toBase64=true) 
13.     { 
14.         if ($str == "") { 
15.             return ""; 
16.         } 
17.   if ($toBase64) { 
18.    return base64_encode(self::_des($key,$str,1)); 
19.   }  
20.   return self::_des($key,$str,1); 
21.     } 
22.    
23.  /** 
24.   * 解密方法 
25.   * 
26.   * @param string $str  需要加密的内容 
27.   * @param string $key  密钥 
28.   * @param bool $toBase64 是否base64 
29.   * return string 
30.   */ 
31.     public function decrypt($str, $key, $toBase64=true) 
32.     { 
33.         if ($str == "") { 
34.             return ""; 
35.         } 
36.   if ($toBase64) { 
37.    return self::_des($key,base64_decode($str),0); 
38.   } 
39.   return self::_des($key,$str,0); 
40.     } 
41.    
42.     private function _des($key, $message, $encrypt, $mode=0, $iv=null) { 
43.       $spfunction1 = 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); 
44.       $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,-0x7fffffe0,0,0x108000,0x8020,-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); 
45.       $spfunction3 = 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); 
46.       $spfunction4 = 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); 
47.       $spfunction5 = 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); 
48.       $spfunction6 = 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); 
49.       $spfunction7 = 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); 
50.       $spfunction8 = array (0x10001040,0x1000,0x40000,0x10041040,0x10000000,0x10001040,0x40,0x10000000,0x40040,0x10040000,0x10041040,0x41000,0x10041000,0x41040,0x1000,0x40,0x10040000,0x10000040,0x10001000,0x1040,0x41000,0x40040,0x10040040,0x10041000,0x1040,0,0,0x10040040,0x10000040,0x10001000,0x41040,0x40000,0x41040,0x40000,0x10041000,0x1000,0x40,0x10040040,0x1000,0x41040,0x10001000,0x40,0x10000040,0x10040000,0x10040040,0x10000000,0x40000,0x10001040,0,0x10041040,0x40040,0x10000040,0x10040000,0x10001000,0x10001040,0,0x10041040,0x41000,0x41000,0x1040,0x1040,0x40040,0x10000000,0x10041000); 
51.       $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); 
52.    
53.       $keys = self::_createKeys ($key); 
54.       $m=0; 
55.       $len = strlen($message); 
56.       $chunk = 0; 
57.    
58.       $iterations = ((count($keys) == 32) ? 3 : 9); 
59.       if ($iterations == 3) {$looping = (($encrypt) ? array (0, 32, 2) : array (30, -2, -2));} 
60.       else {$looping = (($encrypt) ? array (0, 32, 2, 62, 30, -2, 64, 96, 2) : array (94, 62, -2, 32, 64, 2, 30, -2, -2));} 
61.    
62.       $message .= (chr(0) . chr(0) . chr(0) . chr(0) . chr(0) . chr(0) . chr(0) . chr(0)); 
63.    
64.       $result = ""; 
65.       $tempresult = ""; 
66.    
67.       if ($mode == 1) { 
68.         $cbcleft = (ord($iv[$m++]) << 24) | (ord($iv[$m++]) << 16) | (ord($iv[$m++]) << 8) | ord($iv[$m++]); 
69.         $cbcright = (ord($iv[$m++]) << 24) | (ord($iv[$m++]) << 16) | (ord($iv[$m++]) << 8) | ord($iv[$m++]); 
70.         $m=0; 
71.       } 
72.    
73.       while ($m < $len) { 
74.         $left = (ord($message[$m++]) << 24) | (ord($message[$m++]) << 16) | (ord($message[$m++]) << 8) | ord($message[$m++]); 
75.         $right = (ord($message[$m++]) << 24) | (ord($message[$m++]) << 16) | (ord($message[$m++]) << 8) | ord($message[$m++]); 
76.    
77.         if ($mode == 1) {if ($encrypt) {$left ^= $cbcleft; $right ^= $cbcright;} else {$cbcleft2 = $cbcleft; $cbcright2 = $cbcright; $cbcleft = $left; $cbcright = $right;}} 
78.    
79.         $temp = (($left >> 4 & $masks[4]) ^ $right) & 0x0f0f0f0f; $right ^= $temp; $left ^= ($temp << 4); 
80.         $temp = (($left >> 16 & $masks[16]) ^ $right) & 0x0000ffff; $right ^= $temp; $left ^= ($temp << 16); 
81.         $temp = (($right >> 2 & $masks[2]) ^ $left) & 0x33333333; $left ^= $temp; $right ^= ($temp << 2); 
82.         $temp = (($right >> 8 & $masks[8]) ^ $left) & 0x00ff00ff; $left ^= $temp; $right ^= ($temp << 8); 
83.         $temp = (($left >> 1 & $masks[1]) ^ $right) & 0x55555555; $right ^= $temp; $left ^= ($temp << 1); 
84.    
85.         $left = (($left << 1) | ($left >> 31 & $masks[31])); 
86.         $right = (($right << 1) | ($right >> 31 & $masks[31])); 
87.    
88.         for ($j=0; $j<$iterations; $j+=3) { 
89.           $endloop = $looping[$j+1]; 
90.           $loopinc = $looping[$j+2]; 
91.           for ($i=$looping[$j]; $i!=$endloop; $i+=$loopinc) { 
92.             $right1 = $right ^ $keys[$i]; 
93.             $right2 = (($right >> 4 & $masks[4]) | ($right << 28)) ^ $keys[$i+1]; 
94.             $temp = $left; 
95.             $left = $right; 
96.             $right = $temp ^ ($spfunction2[($right1 >> 24 & $masks[24]) & 0x3f] | $spfunction4[($right1 >> 16 & $masks[16]) & 0x3f] 
97.                   | $spfunction6[($right1 >>  8 & $masks[8]) & 0x3f] | $spfunction8[$right1 & 0x3f] 
98.                   | $spfunction1[($right2 >> 24 & $masks[24]) & 0x3f] | $spfunction3[($right2 >> 16 & $masks[16]) & 0x3f] 
99.                   | $spfunction5[($right2 >>  8 & $masks[8]) & 0x3f] | $spfunction7[$right2 & 0x3f]); 
100.           } 
101.           $temp = $left; $left = $right; $right = $temp;  
102.         }  
103.    
104.         $left = (($left >> 1 & $masks[1]) | ($left << 31)); 
105.         $right = (($right >> 1 & $masks[1]) | ($right << 31)); 
106.    
107.         $temp = (($left >> 1 & $masks[1]) ^ $right) & 0x55555555; $right ^= $temp; $left ^= ($temp << 1); 
108.         $temp = (($right >> 8 & $masks[8]) ^ $left) & 0x00ff00ff; $left ^= $temp; $right ^= ($temp << 8); 
109.         $temp = (($right >> 2 & $masks[2]) ^ $left) & 0x33333333; $left ^= $temp; $right ^= ($temp << 2); 
110.         $temp = (($left >> 16 & $masks[16]) ^ $right) & 0x0000ffff; $right ^= $temp; $left ^= ($temp << 16); 
111.         $temp = (($left >> 4 & $masks[4]) ^ $right) & 0x0f0f0f0f; $right ^= $temp; $left ^= ($temp << 4); 
112.    
113.         if ($mode == 1) {if ($encrypt) {$cbcleft = $left; $cbcright = $right;} else {$left ^= $cbcleft2; $right ^= $cbcright2;}} 
114.         $tempresult .= (chr($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)); 
115.    
116.         $chunk += 8; 
117.         if ($chunk == 512) {$result .= $tempresult; $tempresult = ""; $chunk = 0;} 
118.       } 
119.    
120.       return ($result . $tempresult); 
121.     }  
122.    
123.     private function _createKeys ($key) { 
124.       $pc2bytes0  = array (0,0x4,0x20000000,0x20000004,0x10000,0x10004,0x20010000,0x20010004,0x200,0x204,0x20000200,0x20000204,0x10200,0x10204,0x20010200,0x20010204); 
125.       $pc2bytes1  = array (0,0x1,0x100000,0x100001,0x4000000,0x4000001,0x4100000,0x4100001,0x100,0x101,0x100100,0x100101,0x4000100,0x4000101,0x4100100,0x4100101); 
126.       $pc2bytes2  = array (0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808,0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808); 
127.       $pc2bytes3  = array (0,0x200000,0x8000000,0x8200000,0x2000,0x202000,0x8002000,0x8202000,0x20000,0x220000,0x8020000,0x8220000,0x22000,0x222000,0x8022000,0x8222000); 
128.       $pc2bytes4  = array (0,0x40000,0x10,0x40010,0,0x40000,0x10,0x40010,0x1000,0x41000,0x1010,0x41010,0x1000,0x41000,0x1010,0x41010); 
129.       $pc2bytes5  = array (0,0x400,0x20,0x420,0,0x400,0x20,0x420,0x2000000,0x2000400,0x2000020,0x2000420,0x2000000,0x2000400,0x2000020,0x2000420); 
130.       $pc2bytes6  = array (0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002,0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002); 
131.       $pc2bytes7  = array (0,0x10000,0x800,0x10800,0x20000000,0x20010000,0x20000800,0x20010800,0x20000,0x30000,0x20800,0x30800,0x20020000,0x20030000,0x20020800,0x20030800); 
132.       $pc2bytes8  = array (0,0x40000,0,0x40000,0x2,0x40002,0x2,0x40002,0x2000000,0x2040000,0x2000000,0x2040000,0x2000002,0x2040002,0x2000002,0x2040002); 
133.       $pc2bytes9  = array (0,0x10000000,0x8,0x10000008,0,0x10000000,0x8,0x10000008,0x400,0x10000400,0x408,0x10000408,0x400,0x10000400,0x408,0x10000408); 
134.       $pc2bytes10 = array (0,0x20,0,0x20,0x100000,0x100020,0x100000,0x100020,0x2000,0x2020,0x2000,0x2020,0x102000,0x102020,0x102000,0x102020); 
135.       $pc2bytes11 = array (0,0x1000000,0x200,0x1000200,0x200000,0x1200000,0x200200,0x1200200,0x4000000,0x5000000,0x4000200,0x5000200,0x4200000,0x5200000,0x4200200,0x5200200); 
136.       $pc2bytes12 = array (0,0x1000,0x8000000,0x8001000,0x80000,0x81000,0x8080000,0x8081000,0x10,0x1010,0x8000010,0x8001010,0x80010,0x81010,0x8080010,0x8081010); 
137.       $pc2bytes13 = array (0,0x4,0x100,0x104,0,0x4,0x100,0x104,0x1,0x5,0x101,0x105,0x1,0x5,0x101,0x105); 
138.       $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); 
139.    
140.       $iterations = ((strlen($key) >= 24) ? 3 : 1); 
141.       $keys = array ();  
142.       $shifts = array (0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0); 
143.       $m=0; 
144.       $n=0; 
145.    
146.       for ($j=0; $j<$iterations; $j++) {  
147.         $left = (ord($key[$m++]) << 24) | (ord($key[$m++]) << 16) | (ord($key[$m++]) << 8) | ord($key[$m++]); 
148.         $right = (ord($key[$m++]) << 24) | (ord($key[$m++]) << 16) | (ord($key[$m++]) << 8) | ord($key[$m++]); 
149.    
150.         $temp = (($left >> 4 & $masks[4]) ^ $right) & 0x0f0f0f0f; $right ^= $temp; $left ^= ($temp << 4); 
151.         $temp = (($right >> 16 & $masks[16]) ^ $left) & 0x0000ffff; $left ^= $temp; $right ^= ($temp << -16); 
152.         $temp = (($left >> 2 & $masks[2]) ^ $right) & 0x33333333; $right ^= $temp; $left ^= ($temp << 2); 
153.         $temp = (($right >> 16 & $masks[16]) ^ $left) & 0x0000ffff; $left ^= $temp; $right ^= ($temp << -16); 
154.         $temp = (($left >> 1 & $masks[1]) ^ $right) & 0x55555555; $right ^= $temp; $left ^= ($temp << 1); 
155.         $temp = (($right >> 8 & $masks[8]) ^ $left) & 0x00ff00ff; $left ^= $temp; $right ^= ($temp << 8); 
156.         $temp = (($left >> 1 & $masks[1]) ^ $right) & 0x55555555; $right ^= $temp; $left ^= ($temp << 1); 
157.    
158.         $temp = ($left << 8) | (($right >> 20 & $masks[20]) & 0x000000f0); 
159.         $left = ($right << 24) | (($right << 8) & 0xff0000) | (($right >> 8 & $masks[8]) & 0xff00) | (($right >> 24 & $masks[24]) & 0xf0); 
160.         $right = $temp; 
161.    
162.         for ($i=0; $i < count($shifts); $i++) { 
163.           if ($shifts[$i] > 0) { 
164.              $left = (($left << 2) | ($left >> 26 & $masks[26])); 
165.              $right = (($right << 2) | ($right >> 26 & $masks[26])); 
166.           } else { 
167.              $left = (($left << 1) | ($left >> 27 & $masks[27])); 
168.              $right = (($right << 1) | ($right >> 27 & $masks[27])); 
169.           } 
170.           $left = $left & -0xf; 
171.           $right = $right & -0xf; 
172.    
173.           $lefttemp = $pc2bytes0[$left >> 28 & $masks[28]] | $pc2bytes1[($left >> 24 & $masks[24]) & 0xf] 
174.                   | $pc2bytes2[($left >> 20 & $masks[20]) & 0xf] | $pc2bytes3[($left >> 16 & $masks[16]) & 0xf] 
175.                   | $pc2bytes4[($left >> 12 & $masks[12]) & 0xf] | $pc2bytes5[($left >> 8 & $masks[8]) & 0xf] 
176.                   | $pc2bytes6[($left >> 4 & $masks[4]) & 0xf]; 
177.           $righttemp = $pc2bytes7[$right >> 28 & $masks[28]] | $pc2bytes8[($right >> 24 & $masks[24]) & 0xf] 
178.                     | $pc2bytes9[($right >> 20 & $masks[20]) & 0xf] | $pc2bytes10[($right >> 16 & $masks[16]) & 0xf] 
179.                     | $pc2bytes11[($right >> 12 & $masks[12]) & 0xf] | $pc2bytes12[($right >> 8 & $masks[8]) & 0xf] 
180.                     | $pc2bytes13[($right >> 4 & $masks[4]) & 0xf]; 
181.           $temp = (($righttemp >> 16 & $masks[16]) ^ $lefttemp) & 0x0000ffff; 
182.           $keys[$n++] = $lefttemp ^ $temp; $keys[$n++] = $righttemp ^ ($temp << 16); 
183.         } 
184.       }  
185.       return $keys; 
186.     }  
187. } 
188.    
189. // 使用方式 
190. $Des = new Des(); 
191. $string = 'hello leven'; 
192. $key = '123456'; 
193. $encode = $Des->encrypt($string,$key,true); 
194. $decode = $Des->decrypt($encode,$key,true); 
195. echo $encode; 
196. echo "<br />"; 
197. echo $decode; 
198. ?> 

另一个DES加密算法

1. class CryptDes { 
2.  function __construct(){ 
3.   $this->key = 'codelovers'; //密钥 
4.   $this->iv = '15548632'; //偏移量 
5.  } 
6.  /* 
7.   * 加密 
8.   */ 
9.  function encrypt($input){ 
10.   $size = mcrypt_get_block_size(MCRYPT_DES,MCRYPT_MODE_CBC); //3DES加密将MCRYPT_DES改为MCRYPT_3DES 
11.   $input = $this->pkcs5_pad($input, $size); //如果采用PaddingPKCS7，请更换成PaddingPKCS7方法。 
12.   $key = str_pad($this->key,8,'0'); //3DES加密将8改为24 
13.   $td = mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_CBC, ''); 
14.   if( $this->iv == '' ) 
15.   { 
16.    $iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND); 
17.   } 
18.   else 
19.   { 
20.    $iv = $this->iv; 
21.   } 
22.   @mcrypt_generic_init($td, $key, $iv); 
23.   $data = mcrypt_generic($td, $input); 
24.   mcrypt_generic_deinit($td); 
25.   mcrypt_module_close($td); 
26.   $data = base64_encode($data);//如需转换二进制可改成 bin2hex 转换 
27.   return $data; 
28.  } 
29.  /* 
30.   * 解密 
31.   */ 
32.  function decrypt($encrypted){ 
33.   $encrypted = base64_decode($encrypted); //如需转换二进制可改成 bin2hex 转换 
34.   $key = str_pad($this->key,8,'0'); //3DES加密将8改为24 
35.   $td = mcrypt_module_open(MCRYPT_DES,'',MCRYPT_MODE_CBC,'');//3DES加密将MCRYPT_DES改为MCRYPT_3DES 
36.   if( $this->iv == '' ) 
37.   { 
38.    $iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND); 
39.   } 
40.   else 
41.   { 
42.    $iv = $this->iv; 
43.   } 
44.   $ks = mcrypt_enc_get_key_size($td); 
45.   @mcrypt_generic_init($td, $key, $iv); 
46.   $decrypted = mdecrypt_generic($td, $encrypted); 
47.   mcrypt_generic_deinit($td); 
48.   mcrypt_module_close($td); 
49.   $y=$this->pkcs5_unpad($decrypted); 
50.   return $y; 
51.  } 
52.  function pkcs5_pad ($text, $blocksize) { 
53.   $pad = $blocksize - (strlen($text) % $blocksize); 
54.   return $text . str_repeat(chr($pad), $pad); 
55.  } 
56.  function pkcs5_unpad($text){ 
57.   $pad = ord($text{strlen($text)-1}); 
58.   if ($pad > strlen($text)) { 
59.    return false; 
60.   } 
61.   if (strspn($text, chr($pad), strlen($text) - $pad) != $pad){ 
62.    return false; 
63.   } 
64.   return substr($text, 0, -1 * $pad); 
65.  } 
66.  function PaddingPKCS7($data) { 
67.   $block_size = mcrypt_get_block_size(MCRYPT_DES, MCRYPT_MODE_CBC);//3DES加密将MCRYPT_DES改为MCRYPT_3DES 
68.   $padding_char = $block_size - (strlen($data) % $block_size); 
69.   $data .= str_repeat(chr($padding_char),$padding_char); 
70.   return $data; 
71.  } 
72. } 

用法如下：

1. $str = 'www.phpfensi.com'; 
2. $des = new CryptDes(); 
3. $mres = $des->encrypt($str); //加密 
4. echo $mres."<br/>"; 
5. $jres = $des->decrypt($mres); //解密 
6. echo $jres."<br/>";

Tags: PHP加密算法 Des加密算法

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