internal static CngKey FromXml(string xml)
{
CngKey key;
using (TextReader reader = new StringReader(xml))
{
using (XmlTextReader reader2 = new XmlTextReader(reader))
{
BigInteger integer;
BigInteger integer2;
XPathNavigator navigator = new XPathDocument(reader2).CreateNavigator();
if (!navigator.MoveToFirstChild())
{
throw new ArgumentException(System.SR.GetString("Cryptography_MissingDomainParameters"));
}
CngAlgorithm algorithm = ReadAlgorithm(navigator);
if (!navigator.MoveToNext(XPathNodeType.Element))
{
throw new ArgumentException(System.SR.GetString("Cryptography_MissingPublicKey"));
}
ReadPublicKey(navigator, out integer, out integer2);
key = CngKey.Import(NCryptNative.BuildEccPublicBlob(algorithm.Algorithm, integer, integer2), CngKeyBlobFormat.EccPublicBlob);
}
}
return(key);
}
/// <summary>
/// Restore a key from XML
/// </summary>
internal static CngKey FromXml(string xml)
{
Contract.Requires(xml != null);
Contract.Ensures(Contract.Result <CngKey>() != null);
// Load the XML into an XPathNavigator to access sub elements
using (TextReader textReader = new StringReader(xml))
using (XmlTextReader xmlReader = new XmlTextReader(textReader)) {
XPathDocument document = new XPathDocument(xmlReader);
XPathNavigator navigator = document.CreateNavigator();
// Move into the root element - we don't do a specific namespace check here for compatibility
// with XML that Windows generates.
if (!navigator.MoveToFirstChild())
{
throw new ArgumentException(SR.GetString(SR.Cryptography_MissingDomainParameters));
}
// First figure out which algorithm this key belongs to
CngAlgorithm algorithm = ReadAlgorithm(navigator);
// Then read out the public key value
if (!navigator.MoveToNext(XPathNodeType.Element))
{
throw new ArgumentException(SR.GetString(SR.Cryptography_MissingPublicKey));
}
BigInteger x;
BigInteger y;
ReadPublicKey(navigator, out x, out y);
// Finally, convert them into a key blob to import into a CngKey
byte[] keyBlob = NCryptNative.BuildEccPublicBlob(algorithm.Algorithm, x, y);
return(CngKey.Import(keyBlob, CngKeyBlobFormat.EccPublicBlob));
}
}
