/// <summary>
/// Seal encrypts and authenticates the next message in the STREAM,
/// authenticates the associated data, and returns the result.
/// </summary>
/// <param name="plaintext">The plaintext to encrypt.</param>
/// <param name="data">Associated data items to authenticate.</param>
/// <param name="last">True if this is the last block in the STREAM.</param>
/// <returns>Concatenation of the authentication tag and the encrypted data.</returns>
public byte[] Seal(byte[] plaintext, byte[] data = null, bool last = false)
{
if (disposed)
{
throw new ObjectDisposedException(nameof(StreamEncryptor));
}
if (finished)
{
throw new CryptographicException("STREAM is already finished.");
}
finished = last;
return(siv.Seal(plaintext, data, nonce.Next(last)));
}
/// <summary>
/// Seal encrypts and authenticates plaintext, authenticates
/// the associated data, and returns the result.
/// </summary>
/// <param name="plaintext">The plaintext to encrypt.</param>
/// <param name="nonce">The nonce for encryption.</param>
/// <param name="data">Associated data to authenticate.</param>
/// <returns>Concatenation of the authentication tag and the encrypted data.</returns>
public byte[] Seal(byte[] plaintext, byte[] nonce = null, byte[] data = null)
{
return(siv.Seal(plaintext, data, nonce));
}