/// <inheritdoc cref="DisposableBase.ThrowIfDisposed"/>
/// <exception cref="InvalidOperationException">Already initialized.</exception>
/// <exception cref="ArgumentException">Throws if the <paramref name="plainBytes" /> is empty.</exception>
/// <exception cref="ArgumentNullException">Throws if the <paramref name="plainBytes" /> is null.</exception>
/// <exception cref="CryptographicException">
/// Throws if the <paramref name="plainBytes" /> size does not conform to block
/// size defined in <see cref="BlockSizeInBytes" />.
/// </exception>
public async Task InitializeAsync(byte[] plainBytes)
{
if (plainBytes == null)
{
throw new ArgumentNullException(nameof(plainBytes));
}
if (plainBytes.Length == 0)
{
throw new ArgumentException("Value cannot be an empty collection.", nameof(plainBytes));
}
if (plainBytes.Length % BlockSizeInBytes != 0)
{
throw new CryptographicException(
$"Block size is {BlockSizeInBytes}, but plain bytes have {plainBytes.Length}. Maybe pad the bytes?");
}
if (IsInitialized)
{
throw new InvalidOperationException("Already initialized");
}
ThrowIfDisposed();
var encryptedBytes = plainBytes;
await _protector.ProtectAsync(encryptedBytes).ConfigureAwait(false);
_encryptedBytes = encryptedBytes;
}
