与java通用的加密解密方法
代码如下
class Des_Crypt
{
private $key ;
function __construct ( $key )
{
$this -> key = $key ;
}
function encrypt ( $string )
{
$size = mcrypt_get_block_size ( 'des' , 'ecb' ) ;
$string = mb_convert_encoding ( $string , 'GBK' , 'UTF-8' ) ;
$string = $this -> pkcs5_pad ( $string , $size ) ;
$key = $this -> key ;
$td = mcrypt_module_open ( 'des' , '' , 'ecb' , '' ) ;
$iv = @ mcrypt_create_iv ( mcrypt_enc_get_iv_size ( $td ) , MCRYPT_RAND ) ;
@ mcrypt_generic_init ( $td , $key , $iv ) ;
$data = mcrypt_generic ( $td , $string ) ;
mcrypt_generic_deinit ( $td ) ;
mcrypt_module_close ( $td ) ;
$data = base64_encode ( $data ) ;
return $data ;
}
function decrypt ( $string )
{
$string = base64_decode ( $string ) ;
$key = $this -> key ;
$td = mcrypt_module_open ( 'des' , '' , 'ecb' , '' ) ;
//使用MCRYPT_DES算法,cbc模式
$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 ) ;
//初始处理
$decrypted = mdecrypt_generic ( $td , $string ) ;
//解密
mcrypt_generic_deinit ( $td ) ;
//结束
mcrypt_module_close ( $td ) ;
$result = $this -> pkcs5_unpad ( $decrypted ) ;
$result = mb_convert_encoding ( $result , 'UTF-8' , 'GBK' ) ;
return $result ;
}
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 ) ;
}
}
/*
For example:
$key = "!@#%test";
$string1 = "13701014606";
$string2 = "这是中文测试";
$des = new Des_Crypt($key);
$encryption = $des->encrypt($string2);
$decryption = $des->decrypt($encryption);
echo "原始值：".$decryption;
echo "<br />";
echo "加密值：".$encryption;
*/