public void EncryptBootloaderCB(ref byte[] data, byte[] inkey, byte[] oldkey, BlEncryptionTypes type, out byte[] outkey)
{
#region Error Handling
if (inkey == null)
{
switch (type)
{
case BlEncryptionTypes.Default:
case BlEncryptionTypes.Cbb:
inkey = BlKey;
break;
case BlEncryptionTypes.MfgCbb:
inkey = new byte[0x10]; // 00's for key (MFG bootloader)
break;
default:
throw new ArgumentNullException("inkey");
}
}
if (inkey.Length != 0x10)
{
throw new ArgumentOutOfRangeException("inkey");
}
#endregion
var header = new byte[0x10];
Array.Copy(data, 0x10, header, 0x0, 0x10);
switch (type)
{
case BlEncryptionTypes.Default:
break;
case BlEncryptionTypes.Cbb:
case BlEncryptionTypes.MfgCbb:
Buffer.BlockCopy(oldkey, 0x0, header, 0x0, 0x10);
Buffer.BlockCopy(header, 0x0, data, 0x10, 0x10);
break;
case BlEncryptionTypes.CpuKey:
throw new NotImplementedException("This type is not yet supported...");
default:
throw new ArgumentOutOfRangeException("type");
}
Buffer.BlockCopy(header, 0, data, 0x10, 0x10);
outkey = new HMACSHA1(inkey).ComputeHash(header);
Array.Resize(ref outkey, 0x10);
var tmp = new byte[data.Length - 0x20];
Buffer.BlockCopy(data, 0x20, tmp, 0x0, tmp.Length);
Rc4(ref tmp, outkey);
Buffer.BlockCopy(tmp, 0x0, data, 0x20, tmp.Length);
}
public void DecryptBootloaderCB(ref byte[] data, byte[] inkey, byte[] oldkey, BlEncryptionTypes type, out byte[] outkey)
{
#region Error Handling
if (inkey == null)
{
switch (type)
{
case BlEncryptionTypes.Default:
case BlEncryptionTypes.Cbb:
inkey = BlKey;
break;
case BlEncryptionTypes.MfgCbb:
inkey = new byte[0x10]; // 00's for key (MFG bootloader)
break;
default:
throw new ArgumentNullException("inkey");
}
}
if (inkey.Length != 0x10)
{
throw new ArgumentOutOfRangeException("inkey");
}
#endregion
var header = new byte[0x10];
Array.Copy(data, 0x10, header, 0x0, 0x10);
switch (type)
{
case BlEncryptionTypes.Default:
outkey = new HMACSHA1(inkey).ComputeHash(header);
break;
case BlEncryptionTypes.Cbb:
case BlEncryptionTypes.MfgCbb:
Array.Resize(ref header, 0x20);
Array.Copy(inkey, 0x0, header, 0x10, 0x10);
outkey = new HMACSHA1(oldkey).ComputeHash(header);
break;
case BlEncryptionTypes.CpuKey:
header = new byte[0x30];
Array.Copy(data, 0x10, header, 0x0, 0x10);
Array.Copy(inkey, 0x0, header, 0x10, 0x10);
Array.Copy(oldkey, 0x0, header, 0x20, 0x6);
Array.Copy(oldkey, 0x8, header, 0x20 + 0x8, 0x8);
var cbakey = new byte[0x10];
Array.Copy(oldkey, 0x10, cbakey, 0x0, 0x10);
outkey = new HMACSHA1(cbakey).ComputeHash(header);
break;
default:
throw new ArgumentOutOfRangeException("type");
}
Array.Resize(ref outkey, 0x10);
var decrypted = new byte[data.Length - 0x20];
Buffer.BlockCopy(data, 0x20, decrypted, 0x0, decrypted.Length);
Rc4(ref decrypted, outkey);
Buffer.BlockCopy(decrypted, 0x0, data, 0x20, decrypted.Length);
}
