public static void DecryptAttrs(IEncryptableAttributes node)
{
var nodeKey = node.NodeKey.DecryptedKey;
if (nodeKey == null)
{
node.Attributes = new NodeAttributes(); return;
}
var key2 = new byte[16];
// do we need to reduce
var r = nodeKey.Length > key2.Length;
for (var i = 0; i < 16; i++)
{
key2[i] = r ? (byte)(nodeKey[i] ^ nodeKey[i + 16]) : nodeKey[i];
}
var attrBytes = Crypto.DecryptCbc(key2, node.encryptedAttributes);
var attrString = Encoding.UTF8.GetString(attrBytes)
.Replace("\0", String.Empty)
.Replace("MEGA", String.Empty);
if (string.IsNullOrEmpty(attrString))
{
return;
}
try { node.Attributes = JsonConvert.DeserializeObject <NodeAttributes>(attrString); }
catch (JsonException) { node.Attributes = new NodeAttributes {
Name = "error_loading_attrs"
}; }
}
public static void EncryptAttrs(IEncryptableAttributes node)
{
var nodeKey = node.NodeKey.DecryptedKey;
var attrs = JsonConvert.SerializeObject(node.Attributes);
var attr = Encoding.UTF8.GetBytes("MEGA" + attrs);
var needsPadding = attr.Length % 16 != 0;
var pAttr = new byte[needsPadding ? attr.Length + 16 - (attr.Length % 16) : attr.Length];
Array.Copy(attr, pAttr, attr.Length);
var newKey = new byte[nodeKey.Length];
Array.Copy(nodeKey, newKey, nodeKey.Length);
if (newKey.Length > 16)
{
newKey.XorWith(0, newKey, 16, 16);
}
var aes_key = new byte[16];
Array.Copy(newKey, aes_key, 16);
node.encryptedAttributes = Crypto.EncryptCbc(aes_key, pAttr);
}
public static void DecryptAttrs(IEncryptableAttributes node)
{
var nodeKey = node.NodeKey.DecryptedKey;
if (nodeKey == null) { node.Attributes = new NodeAttributes(); return; }
var key2 = new byte[16];
// do we need to reduce
var r = nodeKey.Length > key2.Length;
for (var i = 0; i < 16; i++)
{
key2[i] = r ? (byte)(nodeKey[i] ^ nodeKey[i + 16]) : nodeKey[i];
}
var attrBytes = Crypto.DecryptCbc(key2, node.encryptedAttributes);
var attrString = Encoding.UTF8.GetString(attrBytes)
.Replace("\0", String.Empty)
.Replace("MEGA", String.Empty);
if (string.IsNullOrEmpty(attrString)) { return; }
try { node.Attributes = JsonConvert.DeserializeObject<NodeAttributes>(attrString); }
catch (JsonException) { node.Attributes = new NodeAttributes { Name = "error_loading_attrs" }; }
}
public static void EncryptAttrs(IEncryptableAttributes node)
{
var nodeKey = node.NodeKey.DecryptedKey;
var attrs = JsonConvert.SerializeObject(node.Attributes);
var attr = Encoding.UTF8.GetBytes("MEGA" + attrs);
var needsPadding = attr.Length % 16 != 0;
var pAttr = new byte[needsPadding ? attr.Length + 16 - (attr.Length % 16) : attr.Length];
Array.Copy(attr, pAttr, attr.Length);
var newKey = new byte[nodeKey.Length];
Array.Copy(nodeKey, newKey, nodeKey.Length);
if (newKey.Length > 16) { newKey.XorWith(0, newKey, 16, 16); }
var aes_key = new byte[16];
Array.Copy(newKey, aes_key, 16);
node.encryptedAttributes = Crypto.EncryptCbc(aes_key, pAttr);
}
