/// <summary>
/// Decrypts a specific encrypted file into a byte array.
/// </summary>
/// <returns></returns>
private byte[] DecryptFromFile()
{
byte[] decryptedBytes;
byte[] decryptKey = byteProcessor.ReadBytesFromFile(KeyPath);
byte[] decryptIV = byteProcessor.ReadBytesFromFile(IVPath);
using (AesCryptoServiceProvider decryptAlg = new AesCryptoServiceProvider())
{
decryptAlg.Padding = PaddingMode.Zeros;
if (decryptKey == null)
{
throw new ArgumentNullException("Key");
}
if (decryptIV == null)
{
throw new ArgumentNullException("IV");
}
using (ICryptoTransform dectyptor = decryptAlg.CreateDecryptor(decryptKey, decryptIV))
{
using (FileStream fsBets = new FileStream(filePathName, FileMode.Open, FileAccess.Read))
{
using (CryptoStream csBets = new CryptoStream(fsBets, dectyptor, CryptoStreamMode.Read))
{
try
{
SerialLength = (int)fsBets.Length;
decryptedBytes = new byte[SerialLength];
csBets.Read(decryptedBytes, 0, SerialLength);
}
catch (Exception ex)
{
throw ex;
}
}
}
}
}
return(decryptedBytes);
}
