public override void FromXmlString(String p_string)
{
// create the params that we will use as the result
ElGamalParameters x_params = new ElGamalParameters();
XDocument xdoc = XDocument.Parse(p_string);
XElement root = xdoc.Root;
if (root != null)
{
// set the value for P
XElement xelP = root.Element("P");
if (xelP != null)
x_params.P = Convert.FromBase64String(xelP.Value);
// set the value for G
XElement xelG = root.Element("G");
if (xelG != null)
x_params.G = Convert.FromBase64String(xelG.Value);
// set the value for Y
XElement xelY = root.Element("Y");
if (xelY != null)
x_params.Y = Convert.FromBase64String(xelY.Value);
// set the value for X (this would not be found in a string
// that was generated by excluding the private elements.
XElement xelX = root.Element("X");
if (xelX != null)
x_params.X = Convert.FromBase64String(xelX.Value);
}
// Import the result
ImportParameters(x_params);
}
/// <summary>
/// Configure the key settings for this algorithm instance from
/// a set of key parameters
/// </summary>
/// <param name="p_parameters"></param>
public override void ImportParameters(ElGamalParameters p_parameters)
{
// obtain the big integer values from the byte parameter values
o_key_struct.P = new BigInteger(p_parameters.P);
o_key_struct.G = new BigInteger(p_parameters.G);
o_key_struct.Y = new BigInteger(p_parameters.Y);
if (p_parameters.X != null && p_parameters.X.Length > 0)
{
o_key_struct.X = new BigInteger(p_parameters.X);
}
// set the length of the key based on the import
KeySizeValue = o_key_struct.P.bitCount();
}
public abstract void ImportParameters(ElGamalParameters p_parameters);
public override ElGamalParameters ExportParameters(bool p_include_private_params)
{
if (NeedToGenerateKey())
{
// we need to create a new key before we can export
CreateKeyPair(KeySizeValue);
}
// create the parameter set
ElGamalParameters x_params = new ElGamalParameters();
// set the public values of the parameters
x_params.P = o_key_struct.P.getBytes();
x_params.G = o_key_struct.G.getBytes();
x_params.Y = o_key_struct.Y.getBytes();
// if required, include the private value, X
if (p_include_private_params)
{
x_params.X = o_key_struct.X.getBytes();
}
else
{
// ensure that we zero the value
x_params.X = new byte[1];
}
// retuen the parameter set
return x_params;
}
