/// <summary>
/// Imports the specified <see cref="DHParameters"/>.
/// </summary>
/// <param name="parameters">The parameters for <see cref="DiffieHellman"/>.</param>
/// <exception cref="CryptographicException"><paramref name="P"/> or <paramref name="G"/> is a null reference (<b>Nothing</b> in Visual Basic) -or- <paramref name="P"/> is not a prime number.</exception>
public override void ImportParameters(DHParameters parameters)
{
if (parameters.P == null)
{
throw new CryptographicException("Missing P value.");
}
if (parameters.G == null)
{
throw new CryptographicException("Missing G value.");
}
BigInteger p = new BigInteger(parameters.P), g = new BigInteger(parameters.G), x = null;
if (parameters.X != null)
{
x = new BigInteger(parameters.X);
}
Initialize(p, g, x, 0, true);
}
/// <summary>
/// Reconstructs a <see cref="DiffieHellman"/> object from an XML string.
/// </summary>
/// <param name="xmlString">The XML string to use to reconstruct the DiffieHellman object.</param>
/// <exception cref="CryptographicException">One of the values in the XML string is invalid.</exception>
public override void FromXmlString(string xmlString)
{
if (xmlString == null)
{
throw new ArgumentNullException();
}
DHParameters dhParams = new DHParameters();
try {
XmlDocument sp = new XmlDocument();
sp.LoadXml(xmlString);
XmlNode se = sp.DocumentElement;
if (se.Name != "DHKeyValue")
{
throw new CryptographicException();
}
XmlNode sl;
sl = se.SelectSingleNode("P");
dhParams.P = Convert.FromBase64String(sl.ToString());
sl = se.SelectSingleNode("G");
dhParams.G = Convert.FromBase64String(sl.ToString());
sl = se.SelectSingleNode("X");
dhParams.X = Convert.FromBase64String(sl.ToString());
ImportParameters(dhParams);
}
finally {
if (dhParams.P != null)
{
Array.Clear(dhParams.P, 0, dhParams.P.Length);
}
if (dhParams.G != null)
{
Array.Clear(dhParams.G, 0, dhParams.G.Length);
}
if (dhParams.X != null)
{
Array.Clear(dhParams.X, 0, dhParams.X.Length);
}
}
}
/// <summary> /// When overridden in a derived class, imports the specified <see cref="DHParameters"/>. /// </summary> /// <param name="parameters">The parameters for Diffie-Hellman.</param> public abstract void ImportParameters(DHParameters parameters);