php中3des加密代码,net中des加解密的实现方法
分类:面向对象

复制代码 代码如下:

复制代码 代码如下:

php5.x版本,要添加php扩展php_mcrypt。

3DES(或称为Triple DES)是三重数据加密算法(TDEA,Triple Data Encryption Algorithm)块密码的通称。它相当于是对每个数据块应用三次DES加密算法。由于计算机运算能力的增强,原版DES密码的密钥长度变得容易被暴力破解;3DES即是设计用来提供一种相对简单的方法,即通过增加DES的密钥长度来避免类似的攻击,而不是设计一种全新的块密码算法。

class Crypt3Des
{
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 $value
* @return
*/
public function encrypt ($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 $value
* @return
*/
public function decrypt ($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);
}
}
?>

key = $key; $this->iv = $iv; } /** *加密 * @param $value * @return */ public function encrypt { $td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, ''); $iv = base64_decode; $value = $this->PaddingPKCS7; $key = base64_decode; mcrypt_generic_init; $ret = base64_encode(mcrypt_generic; mcrypt_generic_deinit; mcrypt_module_close; return $ret; } /** *解密 * @param $value * @return */ public function decrypt { $td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, ''); $iv = base64_decode; $key = base64_decode; mcrypt_generic_init; $ret = trim(mdecrypt_generic($td, base64_decode; $ret = $this->UnPaddingPKCS7; mcrypt_generic_deinit; mcrypt_module_close; return $ret; } private function PaddingPKCS7 { $block_size = mcrypt_get_block_size; $padding_char = $block_size - % $block_size); $data .= str_repeat, $padding_char); return $data; } private function UnPaddingPKCS7 { $pad = ord - 1}); if { return false; } if (strspn, strlen != $pad) { return false; } return substr; } } ?>

PHP版:

 代码如下

复制代码 代码如下:
class STD3Des
 {
     private $key = "";
     private $iv = "";

<?php
class Crypt3Des {
var $key;
function Crypt3Des($key){
$this->key = $key;
}

     /**
     * 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;
     }

function encrypt($input){
$size = mcrypt_get_block_size(MCRYPT_3DES,'ecb');
$input = $this->pkcs5_pad($input, $size);
$key = str_pad($this->key,24,'0');
$td = mcrypt_module_open(MCRYPT_3DES, '', 'ecb', '');
$iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
@mcrypt_generic_init($td, $key, $iv);
$data = mcrypt_generic($td, $input);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
//$data = base64_encode($this->PaddingPKCS7($data));
$data = base64_encode($data);
return $data;
}

     /**
     *加密
     * @param $value
     * @return
     */
     public function encrypt ($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;
     }

function decrypt($encrypted){
$encrypted = base64_decode($encrypted);
$key = str_pad($this->key,24,'0');
$td = mcrypt_module_open(MCRYPT_3DES,'','ecb','');
$iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size($td),MCRYPT_RAND);
$ks = mcrypt_enc_get_key_size($td);
@mcrypt_generic_init($td, $key, $iv);
$decrypted = mdecrypt_generic($td, $encrypted);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
$y=$this->pkcs5_unpad($decrypted);
return $y;
}

     /**
     *解密
     * @param $value
     * @return
     */
     public function decrypt ($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;
     }

function pkcs5_pad ($text, $blocksize) {
$pad = $blocksize - (strlen($text) % $blocksize);
return $text . str_repeat(chr($pad), $pad);
}

     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;
     }

function pkcs5_unpad($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);
}

     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);
     }
 }

function PaddingPKCS7($data) {
$block_size = mcrypt_get_block_size(MCRYPT_3DES, MCRYPT_MODE_CBC);
$padding_char = $block_size - (strlen($data) % $block_size);
$data .= str_repeat(chr($padding_char),$padding_char);
return $data;
}
}

 
 //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.'
';
 $rs2=$des->decrypt($rs1);
 echo $rs2;

用法:

.net版本

$crypt = new Crypt3Des('密钥');
$a = '待加密字符串';
$code = $crypt->encrypt($a);//加密
echo $crypt->decrypt($code);//解密

复制代码 代码如下:
sealed public class CryptoHelper
 {
     ///
     /// Encrypts the specified input.
     ///
     /// The input.
     /// key
     /// iv
     ///
     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;
     }
     ///
     /// Decrypts the specified input.
     ///
     /// the input.
     /// key
     /// iv
     ///
     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));

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