public string SerializeCngKeyWithPrivateKey(CngKey toBeSerialized)
{
if (toBeSerialized == null)
{
throw new ArgumentNullException("toBeSerialized");
}
var privateBlob = toBeSerialized.Export(CngKeyBlobFormat.EccPrivateBlob);
var lengthBytes = new[]
{
privateBlob[4],
privateBlob[5],
privateBlob[6],
privateBlob[7]
};
// Part size in octet
var partLength = BitConverter.ToInt32(lengthBytes, 0);
if (!MappingSizeAndMagicNumberForPrivateKey.ContainsKey(partLength))
{
throw new InvalidOperationException(string.Format("the part length {0} is not correct", partLength));
}
var allPartsInBytes = ByteManipulator.RightmostBits(privateBlob, partLength * 8 * 3);
var keyParts = ByteManipulator.Slice(allPartsInBytes, partLength);
var cngKey = new CngKeySerialized
{
X = keyParts[0],
Y = keyParts[1],
D = keyParts[2]
};
var serializer = new XmlSerializer(typeof(CngKeySerialized));
using (var writer = new StringWriter())
{
serializer.Serialize(writer, cngKey);
return(writer.ToString());
}
}