PHP和.net中des加解密的实现方法

php5.x版本，要添加php扩展php_mcrypt。

php版：

class std3des
 {
     private $key = "";
     private $iv = "";

     /**
     * 构造，传递二个已经进行base64_encode的key与iv
     *
     * @param string $key
     * @param string $iv
     */
     function __construct ($key, $iv)
     {
         if (empty($key) || empty($iv)) {
             echo 'key and iv is not valid';
             exit();
         }
         $this->key = $key;
         $this->iv = $iv;
     }

     /**
     *加密
     * @param <type> $value
     * @return <type>
     */
     public function encrypt ($value)
     {
         $td = mcrypt_module_open(mcrypt_3des, '', mcrypt_mode_cbc, '');
         $iv = base64_decode($this->iv);
         $value = $this->paddingpkcs7($value);
         $key = base64_decode($this->key);
         mcrypt_generic_init($td, $key, $iv);
         $ret = base64_encode(mcrypt_generic($td, $value));
         mcrypt_generic_deinit($td);
         mcrypt_module_close($td);
         return $ret;
     }

     /**
     *解密
     * @param <type> $value
     * @return <type>
     */
     public function decrypt ($value)
     {
         $td = mcrypt_module_open(mcrypt_3des, '', mcrypt_mode_cbc, '');
         $iv = base64_decode($this->iv);
         $key = base64_decode($this->key);
         mcrypt_generic_init($td, $key, $iv);
         $ret = trim(mdecrypt_generic($td, base64_decode($value)));
         $ret = $this->unpaddingpkcs7($ret);
         mcrypt_generic_deinit($td);
         mcrypt_module_close($td);
         return $ret;
     }

     private function paddingpkcs7 ($data)
     {
         $block_size = mcrypt_get_block_size('tripledes', 'cbc');
         $padding_char = $block_size - (strlen($data) % $block_size);
         $data .= str_repeat(chr($padding_char), $padding_char);
         return $data;
     }

     private function unpaddingpkcs7($text)
     {
         $pad = ord($text{strlen($text) - 1});
         if ($pad > strlen($text)) {
             return false;
         }
         if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) {
             return false;
         }
         return substr($text, 0, - 1 * $pad);
     }
 }

 
 //使用
 include('std3des.class.php');
 $key='abcdefgh';
 $iv='abcdefgh';
 $msg='test string';
 $des=new std3des(base64_encode($key),base64_encode($iv));
 $rs1=$des->encrypt($msg);
 echo $rs1.'<br />';
 $rs2=$des->decrypt($rs1);
 echo $rs2;

.net版本

sealed public class cryptohelper
 {
     /// <summary>
     /// encrypts the specified input.
     /// </summary>
     /// <param name="input">the input.</param>
     /// <param name="key">key</param>
     /// <param name="iv">iv</param>
     /// <returns></returns>
     public static string encryptdes(string input, byte[] key, byte[] iv)
     {
         if (input == null || input.length == 0)
             return string.empty;

         descryptoserviceprovider des = new descryptoserviceprovider();
         memorystream ms = null;
         cryptostream encstream = null;
         streamwriter sw = null;
         string result = string.empty;

         try
         {
             ms = new memorystream();

             // create a cryptostream using the memory stream and the
             // csp des key. 
             //des.mode = ciphermode.cbc;
             //des.padding = paddingmode.pkcs7; 
             encstream = new cryptostream(ms, des.createencryptor(key, iv), cryptostreammode.write);

             // create a streamwriter to write a string
             // to the stream.
             sw = new streamwriter(encstream);

             // write the plaintext to the stream.
             sw.write(input);

             sw.flush();
             encstream.flushfinalblock();
             ms.flush();

 
             result = convert.tobase64string(ms.getbuffer(), 0, convert.toint32(ms.length, cultureinfo.invariantculture));
         }
         finally
         {
             //close objects
             if (sw != null)
                 sw.close();
             if (encstream != null)
                 encstream.close();
             if (ms != null)
                 ms.close();
         }

         // return the encrypted string
         return result;
     }
     /// <summary>
     /// decrypts the specified input.
     /// </summary>
     /// <param name="input">the input.</param>
     /// <param name="key">key</param>
     /// <param name="iv">iv</param>
     /// <returns></returns>
     public static string decryptdes(string input, byte[] key, byte[] iv)
     {
         byte[] buffer;
         try { buffer = convert.frombase64string(input); }
         catch (system.argumentnullexception) { return string.empty; }
         // length is zero, or not an even multiple of four (plus a few other cases)
         catch (system.formatexception) { return string.empty; }

         descryptoserviceprovider des = new descryptoserviceprovider();
         memorystream ms = null;
         cryptostream encstream = null;
         streamreader sr = null;
         string result = string.empty;

         try
         {
             ms = new memorystream(buffer);

             // create a cryptostream using the memory stream and the
             // csp des key.
             encstream = new cryptostream(ms, des.createdecryptor(key, iv), cryptostreammode.read);

             // create a streamreader for reading the stream.
             sr = new streamreader(encstream);

             // read the stream as a string.
             result = sr.readtoend();
         }
         finally
         {
             //close objects
             if (sr != null)
                 sr.close();
             if (encstream != null)
                 encstream.close();
             if (ms != null)
                 ms.close();
         }

         return result;
     }
 }

 
 //调用

 string key = "abcdefgh";
 string iv = "abcdefgh";
 string msg="test string";
 string rs1 = cryptohelper.encryptdes(msg, system.text.encoding.ascii.getbytes(key), system.text.encoding.ascii.getbytes(iv));
 string rs2 = cryptohelper.decryptdes(rs1, system.text.encoding.ascii.getbytes(key), system.text.encoding.ascii.getbytes(iv));