private void Encrypt(byte[] data)
{
BootLoaderCryptoAlgorithm algorithm = new BootLoaderCryptoAlgorithm();
algorithm.Obfuscate(data);
// Encrypt one block at a time
byte[] block = new byte[BootLoaderCryptoAlgorithm.EncryptedBlockSize];
for (int i = 0; i < BlockCount; i++)
{
Array.Copy(data, i * BootLoaderCryptoAlgorithm.DecryptedBlockSize, block, 0, BootLoaderCryptoAlgorithm.DecryptedBlockSize);
block[50] = 0x15;
byte[] encryptedBlock = algorithm.Encrypt(block);
Array.Copy(encryptedBlock, 0, encryptedData, i * BootLoaderCryptoAlgorithm.EncryptedBlockSize, encryptedBlock.Length);
}
}
public byte[] Decrypt()
{
// Allocate memory for decrypted data
byte[] decryptedData = new byte[BlockCount * BootLoaderCryptoAlgorithm.DecryptedBlockSize];
BootLoaderCryptoAlgorithm algorithm = new BootLoaderCryptoAlgorithm();
int offset = 0;
// Decryption one block at a time
foreach (byte[] encryptedBlock in Blocks)
{
byte[] decryptedBlock = algorithm.Decrypt(encryptedBlock);
// Copy everything except last fixed byte (0x15)
Array.Copy(decryptedBlock, 0, decryptedData, offset, decryptedBlock.Length - 1);
offset += BootLoaderCryptoAlgorithm.DecryptedBlockSize;
}
// Deobfuscate all blocks in one go
algorithm.Deobfuscate(decryptedData);
return(decryptedData);
}
