private byte[] EncryptChunkHashed(byte[] buffer, int block, ContentHashes hashes, int contentID)
{
BigEndianMemoryStream ivStream = new BigEndianMemoryStream(16);
ivStream.WriteBigEndian((short)contentID);
aes.IV = ivStream.GetBuffer();
byte[] decryptedHashes = hashes.GetHashForBlock(block);
decryptedHashes[1] ^= (byte)contentID;
byte[] encryptedhashes = Encrypt(decryptedHashes);
decryptedHashes[1] ^= (byte)contentID;
int iv_start = (block % 16) * 20;
aes.IV = Utils.CopyOfRange(decryptedHashes, iv_start, iv_start + 16);
byte[] encryptedContent = Encrypt(buffer);
MemoryStream outputStream = new MemoryStream(0x10000);
outputStream.Write(encryptedhashes);
outputStream.Write(encryptedContent);
return(outputStream.GetBuffer());
}
private void EncryptFileHashed(Stream input, Stream output, long length, int contentID, ContentHashes hashes)
{
const int hashBlockSize = 0xFC00;
byte[] buffer = new byte[hashBlockSize];
int read;
int block = 0;
do
{
read = input.Read(buffer, 0, hashBlockSize);
output.Write(EncryptChunkHashed(buffer, block, hashes, contentID));
block++;
if (block % 100 == 0)
{
Console.Write($"\rEncryption: {(int)(100.0 * block * hashBlockSize / length)}%");
}
} while (read == hashBlockSize);
Console.WriteLine("\rEncryption: 100%");
}
public void EncryptFileHashed(FileStream input, int contentID, FileStream output, ContentHashes hashes)
{
EncryptFileHashed(input, output, input.Length, contentID, hashes);
}
