public override PaillierParameters 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
PaillierParameters x_params = new PaillierParameters();
// set the public values of the parameters
x_params.N = o_key_struct.N.getBytes();
x_params.G = o_key_struct.G.getBytes();
x_params.Padding = o_key_struct.Padding;
// if required, include the private value, X
if (p_include_private_params)
{
x_params.Lambda = o_key_struct.Lambda.getBytes();
x_params.Miu = o_key_struct.Miu.getBytes();
}
else
{
// ensure that we zero the value
x_params.Lambda = new byte[1];
x_params.Miu = new byte[1];
}
return(x_params);
}
public override void FromXmlString(String p_string)
{
// create the params that we will use as the result
PaillierParameters x_params = new PaillierParameters();
// create a text reader using a string reader
XmlTextReader x_reader =
new XmlTextReader(new System.IO.StringReader(p_string));
// run through the elements in the xml string
while (x_reader.Read())
{
// we are only interested in processing start nodes
if (true || x_reader.IsStartElement())
{
switch (x_reader.Name)
{
case "N":
// set the value for N
x_params.N = Convert.FromBase64String(x_reader.ReadString());
break;
case "G":
// set the value for G
x_params.G = Convert.FromBase64String(x_reader.ReadString());
break;
case "Padding":
// set the padding mode
x_params.Padding = (PaillierPaddingMode)Enum.Parse(typeof(PaillierPaddingMode), x_reader.ReadString());
break;
case "Lambda":
// set the value for Lambda (this would not be found in a
// string that was generated by excluding the private
// elements.
x_params.Lambda = Convert.FromBase64String(x_reader.ReadString());
break;
case "Miu":
// set the value for Lambda (this would not be found in a
// string that was generated by excluding the private
// elements.
x_params.Miu = Convert.FromBase64String(x_reader.ReadString());
break;
}
}
}
// Import the result
ImportParameters(x_params);
}
public override void ImportParameters(PaillierParameters p_parameters)
{
// obtain the big integer values from the byte parameter values
o_key_struct.N = new BigInteger(p_parameters.N);
o_key_struct.G = new BigInteger(p_parameters.G);
o_key_struct.Padding = p_parameters.Padding;
if (p_parameters.Lambda != null && p_parameters.Lambda.Length > 0 &&
p_parameters.Miu != null && p_parameters.Miu.Length > 0)
{
o_key_struct.Lambda = new BigInteger(p_parameters.Lambda);
o_key_struct.Miu = new BigInteger(p_parameters.Miu);
}
// set the length of the key based on the import
KeySizeValue = o_key_struct.N.bitCount();
}
public override string ToXmlString(bool p_include_private)
{
PaillierParameters x_params = ExportParameters(p_include_private);
// create a new string builder
StringBuilder x_sb = new StringBuilder();
// add the header
x_sb.Append("<PaillierKeyValue>");
// add the public elements from the parameters
x_sb.Append("<N>" + Convert.ToBase64String(x_params.N) + "</N>");
x_sb.Append("<G>" + Convert.ToBase64String(x_params.G) + "</G>");
//x_sb.Append("<Padding>" + Padding.ToString() + "</Padding>");
x_sb.Append("<Padding>" + x_params.Padding.ToString() + "</Padding>");
if (p_include_private)
{
// we need to include X, which is the part of private key
x_sb.Append("<Lambda>" + Convert.ToBase64String(x_params.Lambda) + "</Lambda>");
x_sb.Append("<Miu>" + Convert.ToBase64String(x_params.Miu) + "</Miu>");
}
// add the final element
x_sb.Append("</PaillierKeyValue>");
return(x_sb.ToString());
}
public abstract void ImportParameters(PaillierParameters p_parameters);
