internal object AccessValue(EncryptedInstance instance, PropertyInfo property, byte[] bytes)
{
if (bytes != null && bytes.Length > 0)
{
var keyDescriptor = GetEncryptionKey(instance, property);
if (keyDescriptor != null && !keyDescriptor.Locked)
{
byte[] decrypted;
try
{
decrypted = keyDescriptor.Decrypt(property, bytes);
}
catch (Exception ex)
{
if (ThrowExceptionOnAccessorFailure)
{
throw new UnauthorizedAccessException("Cannot read value from encrypted memory.", ex);
}
else
{
return(null);
}
}
return(ProxyDeserializeFunction(property, decrypted));
}
else if (ThrowExceptionOnAccessorFailure)
{
throw new UnauthorizedAccessException("No key data loaded for required name '" + GetEncryptionKeyName(property) + "' or key is locked.");
}
}
return(null);
}
internal bool IsPeriodicallyAccessibleKey(EncryptedInstance instance, PropertyInfo property)
{
var keyDescriptor = GetEncryptionKey(instance, property);
if (keyDescriptor == null)
{
throw new UnauthorizedAccessException("Key '" + GetEncryptionKeyName(property) + "' not loaded");
}
return(keyDescriptor.KeyData.IsPeriodicallyAccessibleKey(property));
}
private KeyDescriptor GetEncryptionKey(EncryptedInstance instance, PropertyInfo propertyInfo)
{
var keyAlias = GetEncryptionKeyName(propertyInfo);
var unifiedKeyring = instance.Reference.Target.GetReadOnlyUnifiedKeyring();
if (keyAlias != null && unifiedKeyring.HasKey(keyAlias))
{
return(unifiedKeyring.Keys.FirstOrDefault(k => k.Name == keyAlias));
}
return(null);
}
internal byte[] MutateValue(EncryptedInstance instance, PropertyInfo property, object obj)
{
if (ProxySerializeFunction == null)
{
throw new Exception("ProxySerializeFunction not bound.");
}
if (obj != null)
{
var keyDescriptor = GetEncryptionKey(instance, property);
if (keyDescriptor != null && !keyDescriptor.Locked)
{
var serialized = ProxySerializeFunction(property, obj);
try
{
return(keyDescriptor.Encrypt(property, serialized));
}
catch (Exception ex)
{
if (ThrowExceptionOnMutatorFailure)
{
throw new UnauthorizedAccessException("Cannot set value to encrypted memory.", ex);
}
else
{
return(null);
}
}
}
else if (ThrowExceptionOnMutatorFailure)
{
throw new UnauthorizedAccessException("No key data loaded for required name '" + GetEncryptionKeyName(property) + "' or key is locked.");
}
}
return(null);
}
