/// <summary>
/// Validates MAC
/// </summary>
/// <param name="outBuf"></param>
/// <param name="vkey"></param>
/// <returns>0, if MAC is valid</returns>
private long Final(byte[] outBuf, byte[] vkey)
{
var tmp = new byte[0x10];
var type = _mac_type;
var res = PrivateFinal(tmp, vkey);
if (res != 0)
{
return(res);
}
//decrypt bbmac
if (type == 3)
{
Array.Copy(outBuf, 0, _kirk_buf, 0x14, 0x10);
Kirk.DecryptWith0(_kirk_buf, 0x10, 0x63);
}
else
{
Array.Copy(outBuf, 0, _kirk_buf, 0, 0x10);
}
for (int i = 0; i < 0x10; i++)
{
if (_kirk_buf[i] != tmp[i])
{
return(0x80510300);
}
}
return(0);
}
/// <summary>
/// Gets MAC Key from MAC and range of bytes
/// </summary>
/// <param name="bbmac"></param>
/// <returns></returns>
public byte[] GetKey(byte[] range, byte[] bbmac)
{
var result = Update(range, range.Length);
if (result != 0)
{
return(null);
}
var tmp = new byte[0x10];
var tmp1 = new byte[0x10];
var type = _mac_type;
var res = PrivateFinal(tmp, null);
if (res != 0)
{
return(null);
}
//decrypt bbmac
if (type == 3)
{
Array.Copy(bbmac, 0, _kirk_buf, 0x14, 0x10);
Kirk.DecryptWith0(_kirk_buf, 0x10, 0x63);
}
else
{
Array.Copy(bbmac, 0, _kirk_buf, 0, 0x10);
}
Array.Copy(_kirk_buf, 0, tmp1, 0, 0x10);
Array.Copy(tmp1, 0, _kirk_buf, 0x14, 0x10);
var code = type == 2 ? 0x3A : 0x38;
Kirk.DecryptWith0(_kirk_buf, 0x10, code);
var vkey = new byte[0x10];
for (int i = 0; i < 0x10; i++)
{
vkey[i] = (byte)(tmp[i] ^ _kirk_buf[i]);
}
return(vkey);
}