/// <summary>
/// Encrypts a byte array to a specified file.
/// </summary>
/// <param name="serialisedBytes"></param>
private void EncryptToFile(byte[] serialisedBytes)
{
if (serialisedBytes == null)
{
throw new ArgumentNullException("Bytes");
}
//AES is the advanced encryption standard class for encryption it
using (AesCryptoServiceProvider encryptAlg = new AesCryptoServiceProvider())
{
//The priavte key is the cipher key used to lock and unlock the encryption.
byte[] key = encryptAlg.Key;
//The IV is the initialisation vector, a randomised block that is used to securely encrypt the data through cipher block chaining.
//Where the preceding block encryption output is used to affect the next one.
byte[] iV = encryptAlg.IV;
byteProcessor.SaveBytesToFile(KeyPath, key);
byteProcessor.SaveBytesToFile(IVPath, iV);
//Padding mode specifies the padding type when a data block is shorter thant the full number of bytes required. AES can use key lengths from 128 - 256 bytes.
encryptAlg.Padding = PaddingMode.Zeros;
using (ICryptoTransform transform = encryptAlg.CreateEncryptor(key, iV))
{
using (FileStream fsBets = new FileStream(filePathName, FileMode.OpenOrCreate, FileAccess.ReadWrite))
{
using (CryptoStream csBets = new CryptoStream(fsBets, transform, CryptoStreamMode.Write))
{
try
{
csBets.Write(serialisedBytes, 0, SerialLength);
csBets.FlushFinalBlock();
}
catch (Exception ex)
{
throw ex;
}
}
}
}
}
}
