/// <summary>
/// Load the properties of this instance, from the properties of another instance of the class <see cref="SecureGram"/>.
/// </summary>
/// <param name="obj">The existing object instance source for the property values.</param>
public void Load(SecureGram obj)
{
this._sender = obj.Sender;
this._created = obj.Created;
this._subject = obj.Subject;
this._messageLength = obj.MessageLength;
this._isCompressed = obj.IsCompressed;
this._message = obj.Message;
}
/// <summary>
/// Creates the encrypted Datagram.
/// Client provides the encryption method to use as <typeparam name="T">SymmetricAlgorithm</typeparam>.
/// </summary>
/// <param name="key"></param>
/// <param name="salt"></param>
/// <returns></returns>
public string CreateGramContent <T>(string key, string salt)
where T : SymmetricAlgorithm, new()
{
DateTime Now = DateTime.Now.ToUniversalTime();
this._created = string.Format("{0:yyyy-MM-dd-TZ-HH:mm:ss.fff}", Now);
this._messageLength = this._message.Length;
StringBuilder SaltedMessage = new StringBuilder(this.Message);
Random r = new Random((int)DateTime.Now.Ticks);
int charCount = r.Next(3, 25);
for (int charIndex = 0; charIndex < charCount; charIndex++)
{
SaltedMessage.Append((char)r.Next(32, 90));
}
SecureGram work = new SecureGram(this);
work.IsCompressed = this._messageLength >= 10000;
if (work.IsCompressed)
{
MemoryStream messageCompressed = new MemoryStream();
using (var outGZipStream = new GZipStream(messageCompressed, CompressionLevel.Optimal))
{
using (StreamWriter sw = new StreamWriter(outGZipStream))
{
sw.Write(SaltedMessage.ToString());
sw.Close();
}
}
work.Message = Convert.ToBase64String(messageCompressed.ToArray());
}
CipherUtility cipher = new CipherUtility(new T());
return
(cipher.Encrypt(
ObjectJsonSerializer <SecureGram> .CreateDocumentFormat(work),
key,
salt,
Base64FormattingOptions.InsertLineBreaks));
}
/// <summary>
/// Initializes a new instance of the class <see cref="SecureGram"/>, using an existing instance as the parameter.
/// </summary>
/// <param name="obj">The existing instance source for the property values.</param>
public SecureGram(SecureGram obj)
{
this.Load(obj);
}