/// <summary>
/// Checks if a PKM is encrypted; if encrypted, decrypts the PKM.
/// </summary>
/// <remarks>The input PKM object is decrypted; no new object is returned.</remarks>
/// <param name="pkm">PKM to check encryption for (and decrypt if appropriate).</param>
public static void CheckEncrypted(ref byte[] pkm)
{
int format = GetPKMDataFormat(pkm);
switch (format)
{
case 1:
case 2: // no encryption
return;
case 3:
if (pkm.Length == PKX.SIZE_3CSTORED || pkm.Length == PKX.SIZE_3XSTORED)
{
return; // no encryption for C/XD
}
ushort chk = 0;
for (int i = 0x20; i < PKX.SIZE_3STORED; i += 2)
{
chk += BitConverter.ToUInt16(pkm, i);
}
if (chk != BitConverter.ToUInt16(pkm, 0x1C))
{
pkm = PKX.DecryptArray3(pkm);
}
return;
case 4:
case 5:
if (BitConverter.ToUInt16(pkm, 4) != 0) // BK4
{
return;
}
if (BitConverter.ToUInt32(pkm, 0x64) != 0)
{
pkm = PKX.DecryptArray45(pkm);
}
return;
case 6:
case 7:
if (BitConverter.ToUInt16(pkm, 0xC8) != 0 && BitConverter.ToUInt16(pkm, 0x58) != 0)
{
pkm = PKX.DecryptArray(pkm);
}
return;
default:
return; // bad!
}
}
protected override byte[] DecryptPKM(byte[] data) => PKX.DecryptArray(data);
