void xtea3_encrypt (u32 * plain, u32 *key)
{
	u32 a, b, c, d, sum, r, t;

	sum = 0;
	a = plain[0] + key[0];
	b = plain[1] + key[1];
	c = plain[2] + key[2];
	d = plain[3] + key[3];

	for (r = 0; r != 32; r++)
	{
		a = a + (((b << 4) + _lrotl (key[(sum % 4) + 4], b)) ^
			 (d + sum) ^ ((b >> 5) + _lrotl (key[sum % 4], b >> 27)));
		sum = sum + 0x9E3779B9;
		c = c + (((d << 4) + _lrotl (key[((sum >> 11) % 4) + 4], d)) ^
			 (b + sum) ^ ((d >> 5) + _lrotl (key[(sum >> 11) % 4], d >> 27)));

		t = a;
		a = b;
		b = c;
		c = d;
		d = t;
	}
	plain[0] = a ^ key[4];
	plain[1] = b ^ key[5];
	plain[2] = c ^ key[6];
	plain[3] = d ^ key[7];
}