public static void Dispose()
{
if (s_instance != null)
{
s_instance.Dispose();
s_instance = null;
}
}
public static MemoryProtectionAction Generate()
{
if (s_instance == null)
{
s_instance = ChaCha20.Create();
}
s_instance.GenerateKey();
var defaultKey = s_instance.Key;
return((bytes, state, action) =>
{
var mpb = (MemoryProtectedBytes)state;
var key = defaultKey;
// TODO: add ToBytes method that incorporates offset
Span <byte> id = stackalloc byte[sizeof(long)];
BinaryPrimitives.TryWriteInt64LittleEndian(id, mpb.Id);
var iv = ArrayPool <byte> .Shared.Rent(12);
id.Slice(4).CopyTo(iv);
try
{
var transform = action == MemoryProtectionActionType.Encrypt
? s_instance.CreateEncryptor(key, iv)
: s_instance.CreateDecryptor(key, iv);
var data = bytes.ToArray();
var result = transform.TransformFinalBlock(bytes.ToArray(), 0, bytes.Length);
Array.Clear(data, 0, data.Length);
return result;
}
finally
{
ArrayPool <byte> .Shared.Return(iv);
}
});
}
