private static Func <IAuthenticatedEncryptorDescriptor> GetLazyDescriptorDelegate(IInternalXmlKeyManager keyManager, XElement keyElement)
{
// The <key> element will be held around in memory for a potentially lengthy period
// of time. Since it might contain sensitive information, we should protect it.
var encryptedKeyElement = keyElement.ToSecret();
try
{
return(() => keyManager.DeserializeDescriptorFromKeyElement(encryptedKeyElement.ToXElement()));
}
finally
{
// It's important that the lambda above doesn't capture 'descriptorElement'. Clearing the reference here
// helps us detect if we've done this by causing a null ref at runtime.
keyElement = null;
}
}
private static Func<IAuthenticatedEncryptor> GetLazyEncryptorDelegate(IInternalXmlKeyManager keyManager, XElement keyElement)
{
// The <key> element will be held around in memory for a potentially lengthy period
// of time. Since it might contain sensitive information, we should protect it.
var encryptedKeyElement = keyElement.ToSecret();
try
{
return () => keyManager.DeserializeDescriptorFromKeyElement(encryptedKeyElement.ToXElement()).CreateEncryptorInstance();
}
finally
{
// It's important that the lambda above doesn't capture 'descriptorElement'. Clearing the reference here
// helps us detect if we've done this by causing a null ref at runtime.
keyElement = null;
}
}