DES encryption and decryption packaging class implemented in PHP

This article mainly introduces the DES encryption and decryption packaging class implemented by PHP. It analyzes the definition and usage skills of the PHP DES encryption and decryption packaging class in the form of a complete example. Friends in need can refer to the examples in this article.

Describes the DES encryption and decryption packaging class implemented by PHP. Share it with everyone for your reference, the details are as follows:

<?php
/**
* PHP版DES加解密类
* 可与java的DES(DESede/CBC/PKCS5Padding)加密方式兼容
*
*/
class CryptDes {
   var $key;
   var $iv;
   function CryptDes($key, $iv){
    $this->key = $key;
    $this->iv = $iv;
   }
   function encrypt($input){
     $size = mcrypt_get_block_size(MCRYPT_DES,MCRYPT_MODE_CBC); //3DES加密将MCRYPT_DES改为MCRYPT_3DES
     $input = $this->pkcs5_pad($input, $size); //如果采用PaddingPKCS7，请更换成PaddingPKCS7方法。
     $key = str_pad($this->key,8,&#39;0&#39;); //3DES加密将8改为24
     $td = mcrypt_module_open(MCRYPT_DES, &#39;&#39;, MCRYPT_MODE_CBC, &#39;&#39;);
     if( $this->iv == &#39;&#39; )
     {
       $iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
     }
     else
     {
       $iv = $this->iv;
     }
     @mcrypt_generic_init($td, $key, $iv);
     $data = mcrypt_generic($td, $input);
     mcrypt_generic_deinit($td);
     mcrypt_module_close($td);
     $data = base64_encode($data);//如需转换二进制可改成 bin2hex 转换
     return $data;
   }
   function decrypt($encrypted){
     $encrypted = base64_decode($encrypted); //如需转换二进制可改成 bin2hex 转换
     $key = str_pad($this->key,8,&#39;0&#39;); //3DES加密将8改为24
     $td = mcrypt_module_open(MCRYPT_DES,&#39;&#39;,MCRYPT_MODE_CBC,&#39;&#39;);//3DES加密将MCRYPT_DES改为MCRYPT_3DES
     if( $this->iv == &#39;&#39; )
     {
       $iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
     }
     else
     {
       $iv = $this->iv;
     }
     $ks = mcrypt_enc_get_key_size($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 $y;
   }
   function pkcs5_pad ($text, $blocksize) {
     $pad = $blocksize - (strlen($text) % $blocksize);
     return $text . str_repeat(chr($pad), $pad);
   }
   function pkcs5_unpad($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 * $pad);
   }
   function PaddingPKCS7($data) {
     $block_size = mcrypt_get_block_size(MCRYPT_DES, MCRYPT_MODE_CBC);//3DES加密将MCRYPT_DES改为MCRYPT_3DES
     $padding_char = $block_size - (strlen($data) % $block_size);
     $data .= str_repeat(chr($padding_char),$padding_char);
     return $data;
   }
}
$des = new CryptDes("12345678","12345678");//（秘钥向量，混淆向量）
echo $ret = $des->encrypt("1111");//加密字符串
?>

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