PHP实现的DES加密解密封装类完整实例

<?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,'0'); //3DES加密将8改为24     $td = mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_CBC, '');     if( $this->iv == '' )     {       $iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($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,'0'); //3DES加密将8改为24     $td = mcrypt_module_open(MCRYPT_DES,'',MCRYPT_MODE_CBC,'');//3DES加密将MCRYPT_DES改为MCRYPT_3DES     if( $this->iv == '' )     {       $iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($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?>