兼容PHP和Java的des加密解密代码分享

<?php
class DES
{
	var $key;
	var $iv; //偏移量
 
	function DES($key, $iv=0)
	{
		$this->key = $key;
		if($iv == 0)
		{
			$this->iv = $key;
		}
		else 
		{
			$this->iv = $iv;
		}
	}
 
	//加密
	function encrypt($str)
	{		
		$size = mcrypt_get_block_size ( MCRYPT_DES, MCRYPT_MODE_CBC );
		$str = $this->pkcs5Pad ( $str, $size );
 
		$data=mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_ENCRYPT, $this->iv);
		//$data=strtoupper(bin2hex($data)); //返回大写十六进制字符串
		return base64_encode($data);
	}
 
	//解密
	function decrypt($str)
	{
		$str = base64_decode ($str);
		//$strBin = $this->hex2bin( strtolower($str));
		$str = mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_DECRYPT, $this->iv );
		$str = $this->pkcs5Unpad( $str );
		return $str;
	}
 
	function hex2bin($hexData)
	{
		$binData = "";
		for($i = 0; $i < strlen ( $hexData ); $i += 2)
		{
			$binData .= chr(hexdec(substr($hexData, $i, 2)));
		}
		return $binData;
	}
 
	function pkcs5Pad($text, $blocksize)
	{
		$pad = $blocksize - (strlen ( $text ) % $blocksize);
		return $text . str_repeat ( chr ( $pad ), $pad );
	}
 
	function pkcs5Unpad($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 );
	}
}
$str = "abcd";
$key= "asdfwef5";
$crypt = new DES($key);
$mstr = $crypt->encrypt($str);
$str = $crypt->decrypt($mstr);
 
echo $str." <=> ".$mstr;
 
?>
<?php
class DES
{