笔记：des加解密，php和.net版的实现

php5.x版本，要添加php扩展php_mcrypt。

 1 class STD3Des 2 { 3     private $key = ""; 4     private $iv = ""; 5  6     /** 7     * 构造，传递二个已经进行base64_encode的KEY与IV 8     * 9     * @param string $key10     * @param string $iv11     */12     function __construct ($key, $iv)13     {14         if (empty($key) || empty($iv)) {15             echo 'key and iv is not valid';16             exit();17         }18         $this->key = $key;19         $this->iv = $iv;20     }21 22     /**23     *加密24     * @param  $value25     * @return 26     */27     public function encrypt ($value)28     {29         $td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');30         $iv = base64_decode($this->iv);31         $value = $this->PaddingPKCS7($value);32         $key = base64_decode($this->key);33         mcrypt_generic_init($td, $key, $iv);34         $ret = base64_encode(mcrypt_generic($td, $value));35         mcrypt_generic_deinit($td);36         mcrypt_module_close($td);37         return $ret;38     }39 40     /**41     *解密42     * @param  $value43     * @return 44     */45     public function decrypt ($value)46     {47         $td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');48         $iv = base64_decode($this->iv);49         $key = base64_decode($this->key);50         mcrypt_generic_init($td, $key, $iv);51         $ret = trim(mdecrypt_generic($td, base64_decode($value)));52         $ret = $this->UnPaddingPKCS7($ret);53         mcrypt_generic_deinit($td);54         mcrypt_module_close($td);55         return $ret;56     }57 58     private function PaddingPKCS7 ($data)59     {60         $block_size = mcrypt_get_block_size('tripledes', 'cbc');61         $padding_char = $block_size - (strlen($data) % $block_size);62         $data .= str_repeat(chr($padding_char), $padding_char);63         return $data;64     }65 66     private function UnPaddingPKCS7($text)67     {68         $pad = ord($text{strlen($text) - 1});69         if ($pad > strlen($text)) {70             return false;71         }72         if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) {73             return false;74         }75         return substr($text, 0, - 1 * $pad);76     }77 }78 79 80 //使用81 include('STD3Des.class.php');82 $key='abcdefgh';83 $iv='abcdefgh';84 $msg='test string';85 $des=new STD3Des(base64_encode($key),base64_encode($iv));86 $rs1=$des->encrypt($msg);87 echo $rs1.'<br />';88 $rs2=$des->decrypt($rs1);89 echo $rs2;

.net版本

  1 sealed public class CryptoHelper  2 {  3     /// <summary>  4     /// Encrypts the specified input.  5     /// </summary>  6     /// The input.  7     /// key  8     /// iv  9     ///  10     public static string EncryptDes(string input, byte[] key, byte[] iv) 11     { 12         if (input == null || input.Length == 0) 13             return String.Empty; 14  15         DESCryptoServiceProvider des = new DESCryptoServiceProvider(); 16         MemoryStream ms = null; 17         CryptoStream encStream = null; 18         StreamWriter sw = null; 19         string result = String.Empty; 20  21         try 22         { 23             ms = new MemoryStream(); 24  25             // Create a CryptoStream using the memory stream and the  26             // CSP DES key.   27             //des.Mode = CipherMode.CBC; 28             //des.Padding = PaddingMode.PKCS7;   29             encStream = new CryptoStream(ms, des.CreateEncryptor(key, iv), CryptoStreamMode.Write); 30  31             // Create a StreamWriter to write a string 32             // to the stream. 33             sw = new StreamWriter(encStream); 34  35             // Write the plaintext to the stream. 36             sw.Write(input); 37  38             sw.Flush(); 39             encStream.FlushFinalBlock(); 40             ms.Flush(); 41  42  43             result = Convert.ToBase64String(ms.GetBuffer(), 0, Convert.ToInt32(ms.Length, CultureInfo.InvariantCulture)); 44         } 45         finally 46         { 47             //close objects 48             if (sw != null) 49                 sw.Close(); 50             if (encStr<b>6本文来源gao@dai!ma.com搞$代^码!网7</b><pre>搞gaodaima代码

eam != null) 51 encStream.Close(); 52 if (ms != null) 53 ms.Close(); 54 } 55 56 // Return the encrypted string 57 return result; 58 } 59 ///

62 /// the input. 63 /// key 64 /// iv 65 /// 66 public static string DecryptDes(string input, byte[] key, byte[] iv) 67 { 68 byte[] buffer; 69 try { buffer = Convert.FromBase64String(input); } 70 catch (System.ArgumentNullException) { return String.Empty; } 71 // length is zero, or not an even multiple of four (plus a few other cases) 72 catch (System.FormatException) { return String.Empty; } 73 74 DESCryptoServiceProvider des = new DESCryptoServiceProvider(); 75 MemoryStream ms = null; 76 CryptoStream encStream = null; 77 StreamReader sr = null; 78 string result = String.Empty; 79 80 try 81 { 82 ms = new MemoryStream(buffer); 83 84 // Create a CryptoStream using the memory stream and the 85 // CSP DES key. 86 encStream = new CryptoStream(ms, des.CreateDecryptor(key, iv), CryptoStreamMode.Read); 87 88 // Create a StreamReader for reading the stream. 89 sr = new StreamReader(encStream); 90 91 // Read the stream as a string. 92 result = sr.ReadToEnd(); 93 } 94 finally 95 { 96 //close objects 97 if (sr != null) 98 sr.Close(); 99 if (encStream != null)100 encStream.Close();101 if (ms != null)102 ms.Close();103 }104 105 return result;106 }107 }108 109 110 //调用111 112 string key = “abcdefgh”;113 string iv = “abcdefgh”;114 string msg=”test string”;115 string rs1 = CryptoHelper.EncryptDes(msg, System.Text.Encoding.ASCII.GetBytes(key), System.Text.Encoding.ASCII.GetBytes(iv));116 string rs2 = CryptoHelper.DecryptDes(rs1, System.Text.Encoding.ASCII.GetBytes(key), System.Text.Encoding.ASCII.GetBytes(iv));

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