/**

*

* PHP版3DES加解密类

*

* 可与java的3DES(DESede)加密方式兼容

*

* @Author: Luo Hui (farmer.luo at gmail.com)

*

* @version: V0.1 2008.12.04

*

*/

class Crypt3Des

{

public $key    = "01234567890123456789012345678912";

public $iv    = "23456789"; //like java: private static byte[] myIV = { 50, 51, 52, 53, 54, 55, 56, 57 };

//加密

public function encrypt($input)

{

$input = $this->padding( $input );

$key = base64_decode($this->key);

$td = mcrypt_module_open( MCRYPT_3DES, ”, MCRYPT_MODE_CBC, ”);

//使用MCRYPT_3DES算法,cbc模式

mcrypt_generic_init($td, $key, $this->iv);

//初始处理

$data = mcrypt_generic($td, $input);

//加密

mcrypt_generic_deinit($td);

//结束

mcrypt_module_close($td);

$data = $this->removeBR(base64_encode($data));

return $data;

}

//解密

public function decrypt($encrypted)

{

$encrypted = base64_decode($encrypted);

$key = base64_decode($this->key);

$td = mcrypt_module_open( MCRYPT_3DES,”,MCRYPT_MODE_CBC,”);

//使用MCRYPT_3DES算法,cbc模式

mcrypt_generic_init($td, $key, $this->iv);

//初始处理

$decrypted = mdecrypt_generic($td, $encrypted);

//解密

mcrypt_generic_deinit($td);

//结束

mcrypt_module_close($td);

$decrypted = $this->removePadding($decrypted);

return $decrypted;

}

//填充密码，填充至8的倍数

public function padding( $str )

{

$len = 8 – strlen( $str ) % 8;

for ( $i = 0; $i < $len; $i++ )

{

$str .= chr( 0 );

}

return $str ;

}

//删除填充符

public function removePadding( $str )

{

$len = strlen( $str );

$newstr = "";

$str = str_split($str);

for ($i = 0; $i < $len; $i++ )

{

if ($str[$i] != chr( 0 ))

{

$newstr .= $str[$i];

}

}

return $newstr;

}

//删除回车和换行

public function removeBR( $str )

{

$len = strlen( $str );

$newstr = "";

$str = str_split($str);

for ($i = 0; $i < $len; $i++ )

{

if ($str[$i] != ‘n’ and $str[$i] != ‘r’)

{

$newstr .= $str[$i];

}

}

return $newstr;

}

}

//test

$input = "1qaz2ws";

echo "plainText:" . $input."
";

$crypt = new Crypt3Des();

echo "Encode:".$crypt->encrypt($input)."
";

echo "Decode:".$crypt->decrypt($crypt->encrypt($input));

?>

结果：

plainText:1qaz2ws

Encode:0GsXgYA8BuM=

Decode:1qaz2ws