PHP和.net中des加解密的实现方法_php实例

php5.x版本，要添加php扩展php_mcrypt。

PHP版：

class STD3Des<BR> {<BR>     private $key = "";<BR>     private $iv = "";<br><br>     /**<BR>     * 构造，传递二个已经进行base64_encode的KEY与IV<BR>     *<BR>     * @param string $key<BR>     * @param string $iv<BR>     */<BR>     function __construct ($key, $iv)<BR>     {<BR>         if (empty($key) || empty($iv)) {<BR>             echo 'key and iv is not valid';<BR>             exit();<BR>         }<BR>         $this->key = $key;<BR>         $this->iv = $iv;<BR>     }<br><br>     /**<BR>     *加密<BR>     * @param  $value<BR>     * @return <BR>     */<BR>     public function encrypt ($value)<BR>     {<BR>         $td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');<BR>         $iv = base64_decode($this->iv);<BR>         $value = $this->PaddingPKCS7($value);<BR>         $key = base64_decode($this->key);<BR>         mcrypt_generic_init($td, $key, $iv);<BR>         $ret = base64_encode(mcrypt_generic($td, $value));<BR>         mcrypt_generic_deinit($td);<BR>         mcrypt_module_close($td);<BR>         return $ret;<BR>     }<br><br>     /**<BR>     *解密<BR>     * @param  $value<BR>     * @return <BR>     */<BR>     public function decrypt ($value)<BR>     {<BR>         $td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');<BR>         $iv = base64_decode($this->iv);<BR>         $key = base64_decode($this->key);<BR>         mcrypt_generic_init($td, $key, $iv);<BR>         $ret = trim(mdecrypt_generic($td, base64_decode($value)));<BR>         $ret = $this->UnPaddingPKCS7($ret);<BR>         mcrypt_generic_deinit($td);<BR>         mcrypt_module_close($td);<BR>         return $ret;<BR>     }<br><br>     private function PaddingPKCS7 ($data)<BR>     {<BR> <a style="color:transparent">来@源gao*daima.com搞@代#码网</a><strong>搞gaodaima代码</strong>        $block_size = mcrypt_get_block_size('tripledes', 'cbc');<BR>         $padding_char = $block_size - (strlen($data) % $block_size);<BR>         $data .= str_repeat(chr($padding_char), $padding_char);<BR>         return $data;<BR>     }<br><br>     private function UnPaddingPKCS7($text)<BR>     {<BR>         $pad = ord($text{strlen($text) - 1});<BR>         if ($pad > strlen($text)) {<BR>             return false;<BR>         }<BR>         if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) {<BR>             return false;<BR>         }<BR>         return substr($text, 0, - 1 * $pad);<BR>     }<BR> }<br><br> <BR> //使用<BR> include('STD3Des.class.php');<BR> $key='abcdefgh';<BR> $iv='abcdefgh';<BR> $msg='test string';<BR> $des=new STD3Des(base64_encode($key),base64_encode($iv));<BR> $rs1=$des->encrypt($msg);<BR> echo $rs1.'<br />';<BR> $rs2=$des->decrypt($rs1);<BR> echo $rs2;<BR>

.net版本

sealed public class CryptoHelper<BR> {<BR>     /// <summary><BR>     /// Encrypts the specified input.<BR>     /// </summary><BR>     /// The input.<BR>     /// key<BR>     /// iv<BR>     /// <BR>     public static string EncryptDes(string input, byte[] key, byte[] iv)<BR>     {<BR>         if (input == null || input.Length == 0)<BR>             return String.Empty;<br><br>         DESCryptoServiceProvider des = new DESCryptoServiceProvider();<BR>         MemoryStream ms = null;<BR>         CryptoStream encStream = null;<BR>         StreamWriter sw = null;<BR>         string result = String.Empty;<br><br>         try<BR>         {<BR>             ms = new MemoryStream();<br><br>             // Create a CryptoStream using the memory stream and the <BR>             // CSP DES key.  <BR>             //des.Mode = CipherMode.CBC;<BR>             //des.Padding = PaddingMode.PKCS7;  <BR>             encStream = new CryptoStream(ms, des.CreateEncryptor(key, iv), CryptoStreamMode.Write);<br><br>             // Create a StreamWriter to write a string<BR>             // to the stream.<BR>             sw = new StreamWriter(encStream);<br><br>             // Write the plaintext to the stream.<BR>             sw.Write(input);<br><br>             sw.Flush();<BR>             encStream.FlushFinalBlock();<BR>             ms.Flush();<br><br> <BR>             result = Convert.ToBase64String(ms.GetBuffer(), 0, Convert.ToInt32(ms.Length, CultureInfo.InvariantCulture));<BR>         }<BR>         finally<BR>         {<BR>             //close objects<BR>             if (sw != null)<BR>                 sw.Close();<BR>             if (encStream != null)<BR>                 encStream.Close();<BR>             if (ms != null)<BR>                 ms.Close();<BR>         }<br><br>         // Return the encrypted string<BR>         return result;<BR>     }<BR>     /// <summary><BR>     /// Decrypts the specified input.<BR>     /// </summary><BR>     /// the input.<BR>     /// key<BR>     /// iv<BR>     /// <BR>     public static string DecryptDes(string input, byte[] key, byte[] iv)<BR>     {<BR>         byte[] buffer;<BR>         try { buffer = Convert.FromBase64String(input); }<BR>         catch (System.ArgumentNullException) { return String.Empty; }<BR>         // length is zero, or not an even multiple of four (plus a few other cases)<BR>         catch (System.FormatException) { return String.Empty; }<br><br>         DESCryptoServiceProvider des = new DESCryptoServiceProvider();<BR>         MemoryStream ms = null;<BR>         CryptoStream encStream = null;<BR>         StreamReader sr = null;<BR>         string result = String.Empty;<br><br>         try<BR>         {<BR>             ms = new MemoryStream(buffer);<br><br>             // Create a CryptoStream using the memory stream and the <BR>             // CSP DES key. <BR>             encStream = new CryptoStream(ms, des.CreateDecryptor(key, iv), CryptoStreamMode.Read);<br><br>             // Create a StreamReader for reading the stream.<BR>             sr = new StreamReader(encStream);<br><br>             // Read the stream as a string.<BR>             result = sr.ReadToEnd();<BR>         }<BR>         finally<BR>         {<BR>             //close objects<BR>             if (sr != null)<BR>                 sr.Close();<BR>             if (encStream != null)<BR>                 encStream.Close();<BR>             if (ms != null)<BR>                 ms.Close();<BR>         }<br><br>         return result;<BR>     }<BR> }<br><br> <BR> //调用<br><br> string key = "abcdefgh";<BR> string iv = "abcdefgh";<BR> string msg="test string";<BR> string rs1 = CryptoHelper.EncryptDes(msg, System.Text.Encoding.ASCII.GetBytes(key), System.Text.Encoding.ASCII.GetBytes(iv));<BR> string rs2 = CryptoHelper.DecryptDes(rs1, System.Text.Encoding.ASCII.GetBytes(key), System.Text.Encoding.ASCII.GetBytes(iv));<BR>

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