/// <summary>
/// Adds additional data to encrypted data. Additional data is not protected, but it isn't added in plain text either.
/// </summary>
/// <param name="encryptedData">The encrypted data to which to add additional data.</param>
/// <param name="additionalData">The additional data to add. Dictionary items where key or value is null or empty will be ignored/</param>
/// <param name="destination">Stream to which to write encrypted data with added additional data</param>
public static void AddAdditionalData(Stream encryptedData, Dictionary <string, string> additionalData, Stream destination)
{
if (additionalData == null)
{
throw new ArgumentNullException(nameof(additionalData));
}
byte[] dataBytes = new AdditionalData(additionalData).GetBytes();
CryptoContainer.WriteAdditionalData(encryptedData, dataBytes, destination);
}
/// <summary>
/// Reads the additional data from encrypted data if present.
/// </summary>
/// <param name="encryptedData">The encrypted data.</param>
/// <returns>Additional data</returns>
public static Dictionary <string, string> ReadAdditionalData(Stream encryptedData)
{
byte[] data = CryptoContainer.ReadAdditionalData(encryptedData);
return(AdditionalData.LoadFromBytes(data).Data);
}