解析 3DES PKCS7 急在线等

lenovor61i 2009-12-15 02:16:32

谁知道怎么解析 pkcs7的数字签证啊
比如代码



class ThreeDes

{

	public function mcrypt($str)

	{

		return base64_encode($this->fmt3DESEx($this->paddingPKCS7(sha1($str, true))));

	}

	

	public function fmt3DESEx($s)

	{

		$key = pack('H48',"9F8C243AEE347183B39DD81B20941E86BC11529B034C8842");

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

		$iv = pack('H16',"0102030405060708");  //like c# new byte[]{1,2,3,4,5,6,7,8}

		mcrypt_generic_init($td, $key, $iv);

		$encrypted_data = mcrypt_generic($td, $s);

		mcrypt_generic_deinit($td);

		mcrypt_module_close($td);

		return $encrypted_data;

	}

	

	public function paddingPKCS7($data)

	{

		$block_size = mcrypt_get_block_size('tripledes', 'cbc');

		$padding_char = $block_size - (strlen($data) % $block_size);

		$data .= str_repeat(chr($padding_char),$padding_char);

		return $data;

	}

	 

}

$des = new ThreeDes();

$str = '123456';

print $str=$des->mcrypt($str);

123456加密出来是xUL2ewBUn7mqNdrgbTzoZyfUjOMZw6r2
现在我要通过一个方法吧xUL2ewBUn7mqNdrgbTzoZyfUjOMZw6r2
给解成123456
我的方法：



$str='xUL2ewBUn7mqNdrgbTzoZyfUjOMZw6r2';

class demcrypt{

	public function Mydemcrypt($str){

		$str = base64_decode($str); 

		$key = pack('H48',"9F8C243AEE347183B39DD81B20941E86BC11529B034C8842");

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

		$iv = pack('H16',"0102030405060708");  

		if (mcrypt_generic_init($td, $key, $iv) != -1)

		{

			  $decrypted_data = mdecrypt_generic($td,$str);

			  mcrypt_generic_deinit($td);

			  mcrypt_module_close($td);

			  return $decrypted_data;

		}

	}

}

 $destr=new demcrypt();

 print  '<br>'.$destr->Mydemcrypt($str);