private void DerivePerConsoleKeys()
{
var kek = new byte[0x10];
// Derive the device key
if (!PerConsoleKeySource.IsEmpty() && !KeyblobKeys[0].IsEmpty())
{
Crypto.DecryptEcb(KeyblobKeys[0], PerConsoleKeySource, DeviceKey, 0x10);
}
// Derive save key
if (!SaveMacKekSource.IsEmpty() && !SaveMacKeySource.IsEmpty() && !DeviceKey.IsEmpty())
{
Crypto.GenerateKek(DeviceKey, SaveMacKekSource, kek, AesKekGenerationSource, null);
Crypto.DecryptEcb(kek, SaveMacKeySource, SaveMacKey, 0x10);
}
// Derive BIS keys
if (DeviceKey.IsEmpty() ||
BisKekSource.IsEmpty() ||
AesKekGenerationSource.IsEmpty() ||
AesKeyGenerationSource.IsEmpty() ||
RetailSpecificAesKeySource.IsEmpty())
{
return;
}
// If the user doesn't provide bis_key_source_03 we can assume it's the same as bis_key_source_02
if (BisKeySource[3].IsEmpty() && !BisKeySource[2].IsEmpty())
{
Array.Copy(BisKeySource[2], BisKeySource[3], 0x20);
}
Crypto.DecryptEcb(DeviceKey, RetailSpecificAesKeySource, kek, 0x10);
if (!BisKeySource[0].IsEmpty())
{
Crypto.DecryptEcb(kek, BisKeySource[0], BisKeys[0], 0x20);
}
Crypto.GenerateKek(DeviceKey, BisKekSource, kek, AesKekGenerationSource, AesKeyGenerationSource);
for (int i = 1; i < 4; i++)
{
if (!BisKeySource[i].IsEmpty())
{
Crypto.DecryptEcb(kek, BisKeySource[i], BisKeys[i], 0x20);
}
}
}
private void DerivePerConsoleKeys()
{
var kek = new byte[0x10];
// Derive the device key
if (!PerConsoleKeySource.IsEmpty() && !KeyblobKeys[0].IsEmpty())
{
Crypto.DecryptEcb(KeyblobKeys[0], PerConsoleKeySource, DeviceKey, 0x10);
}
// Derive save key
if (!SaveMacKekSource.IsEmpty() && !SaveMacKeySource.IsEmpty() && !DeviceKey.IsEmpty())
{
Crypto.GenerateKek(DeviceKey, SaveMacKekSource, kek, AesKekGenerationSource, null);
Crypto.DecryptEcb(kek, SaveMacKeySource, SaveMacKey, 0x10);
}
// Derive BIS keys
if (DeviceKey.IsEmpty() ||
BisKeySource[0].IsEmpty() ||
BisKeySource[1].IsEmpty() ||
BisKeySource[2].IsEmpty() ||
BisKekSource.IsEmpty() ||
AesKekGenerationSource.IsEmpty() ||
AesKeyGenerationSource.IsEmpty() ||
RetailSpecificAesKeySource.IsEmpty())
{
return;
}
Crypto.DecryptEcb(DeviceKey, RetailSpecificAesKeySource, kek, 0x10);
Crypto.DecryptEcb(kek, BisKeySource[0], BisKeys[0], 0x20);
Crypto.GenerateKek(DeviceKey, BisKekSource, kek, AesKekGenerationSource, AesKeyGenerationSource);
Crypto.DecryptEcb(kek, BisKeySource[1], BisKeys[1], 0x20);
Crypto.DecryptEcb(kek, BisKeySource[2], BisKeys[2], 0x20);
// BIS keys 2 and 3 are the same
Array.Copy(BisKeys[2], BisKeys[3], 0x20);
}