public static byte[] EncryptPayload(byte senderId, byte receiverId, byte[] homeId, byte sequenceNumber, byte[] receiverNonce,
byte[] senderNonce, byte[] networkKey, byte[] textToEncrypt, int generationCount, bool isRealKey)
{
var ret = new COMMAND_CLASS_SECURITY_2.SECURITY_2_MESSAGE_ENCAPSULATION {
sequenceNumber = sequenceNumber
};
InvariantPeerNodeId peerNodeId = new InvariantPeerNodeId(0);
var mpanKey = new byte[SecurityS2Utils.KEY_SIZE];
var ccmKey = new byte[SecurityS2Utils.KEY_SIZE];
var personalization = new byte[SecurityS2Utils.PERSONALIZATION_SIZE];
if (isRealKey)
{
SecurityS2Utils.NetworkKeyExpand(networkKey, ccmKey, personalization, mpanKey);
}
else
{
SecurityS2Utils.TempKeyExpand(networkKey, ccmKey, personalization, mpanKey);
}
SpanTable spanTable = new SpanTable();
spanTable.Add(peerNodeId, receiverNonce, 0, 0);
SpanContainer spanContainer = spanTable.GetContainer(peerNodeId);
spanContainer.InstantiateWithSenderNonce(senderNonce, personalization);
for (int i = 0; i < generationCount; i++)
{
spanContainer.NextNonce();
}
AAD aad = new AAD
{
SenderNodeId = senderId,
ReceiverNodeId = receiverId,
HomeId = homeId,
PayloadLength = (ushort)(textToEncrypt.Length + SecurityS2Utils.AUTH_DATA_HEADER_LENGTH),
SequenceNumber = sequenceNumber
};
aad.PayloadLength += (ushort)((byte[])ret).Length;
var cipherData = SecurityS2Utils.CcmEncryptAndAuth(ccmKey, spanContainer.Span, aad, textToEncrypt);
if (cipherData != null && cipherData.Length > 0)
{
ret.ccmCiphertextObject = new List <byte>(cipherData);
}
else
{
ret = null;
}
return(ret);
}
public static bool DecryptSinglecastFrame(
SpanContainer spanContainer,
SinglecastKey singlecastKey,
byte sourceNodeId,
byte destNodeId,
byte[] homeId,
COMMAND_CLASS_SECURITY_2.SECURITY_2_MESSAGE_ENCAPSULATION cmd,
out byte[] data,
out Extensions extensions)
{
List <COMMAND_CLASS_SECURITY_2.SECURITY_2_MESSAGE_ENCAPSULATION.TVG1> encryptedExtensionsList = new List <COMMAND_CLASS_SECURITY_2.SECURITY_2_MESSAGE_ENCAPSULATION.TVG1>();
List <COMMAND_CLASS_SECURITY_2.SECURITY_2_MESSAGE_ENCAPSULATION.TVG1> extensionsList = new List <COMMAND_CLASS_SECURITY_2.SECURITY_2_MESSAGE_ENCAPSULATION.TVG1>();
extensions = null;
data = null;
bool ret = false;
bool isDecryptSucceeded = false;
InvariantPeerNodeId peerNodeId = new InvariantPeerNodeId(destNodeId, sourceNodeId);
extensionsList = cmd.vg1;
if (spanContainer != null && singlecastKey != null)
{
spanContainer.RxSequenceNumber = cmd.sequenceNumber;
if (spanContainer.SpanState == SpanStates.ReceiversNonce)
{
#region SpanStates.ReceiversNonce
// Establish nonce synchronization.
byte[] senderEntropyInput = null;
if (cmd.properties1.extension == 1)
{
foreach (var extData in cmd.vg1)
{
if (extData.properties1.type == (byte)ExtensionTypes.Span &&
extData.extensionLength == 18 &&
extData.extension.Count == 16)
{
senderEntropyInput = extData.extension.ToArray();
break;
}
}
}
if (senderEntropyInput != null)
{
var receiverEntropyInput = spanContainer.ReceiversNonce;
spanContainer.InstantiateWithSenderNonce(senderEntropyInput, singlecastKey.Personalization);
byte[] plainData;
spanContainer.NextNonce();
isDecryptSucceeded = DecryptS2(singlecastKey.CcmKey,
spanContainer.Span,
sourceNodeId,
destNodeId,
homeId,
cmd,
out plainData,
out encryptedExtensionsList);
if (isDecryptSucceeded)
{
extensions = new Extensions
{
ExtensionsList = extensionsList ?? new List <COMMAND_CLASS_SECURITY_2.SECURITY_2_MESSAGE_ENCAPSULATION.TVG1>(),
EncryptedExtensionsList = encryptedExtensionsList ?? new List <COMMAND_CLASS_SECURITY_2.SECURITY_2_MESSAGE_ENCAPSULATION.TVG1>()
};
ret = true;
data = plainData;
}
else
{
extensions = new Extensions
{
ExtensionsList = extensionsList ?? new List <COMMAND_CLASS_SECURITY_2.SECURITY_2_MESSAGE_ENCAPSULATION.TVG1>(),
EncryptedExtensionsList = new List <COMMAND_CLASS_SECURITY_2.SECURITY_2_MESSAGE_ENCAPSULATION.TVG1>()
};
spanContainer.SetReceiversNonceState();
}
}
#endregion
}
else if (spanContainer.SpanState == SpanStates.Span)
{
#region SpanStates.Span
// Check nonce synchronization.
int attemptsCount = 5;
byte[] plainData = null;
while (!isDecryptSucceeded && attemptsCount > 0)
{
spanContainer.NextNonce();
attemptsCount--;
if (spanContainer != null)
{
isDecryptSucceeded = DecryptS2(singlecastKey.CcmKey,
spanContainer.Span,
sourceNodeId,
destNodeId,
homeId,
cmd,
out plainData,
out encryptedExtensionsList);
}
}
if (isDecryptSucceeded)
{
extensions = new Extensions
{
ExtensionsList = extensionsList ?? new List <COMMAND_CLASS_SECURITY_2.SECURITY_2_MESSAGE_ENCAPSULATION.TVG1>(),
EncryptedExtensionsList = encryptedExtensionsList ?? new List <COMMAND_CLASS_SECURITY_2.SECURITY_2_MESSAGE_ENCAPSULATION.TVG1>()
};
ret = true;
data = plainData;
}
#endregion
}
else
{
throw new InvalidOperationException("Unexpected nonce state");
}
}
return(ret);
}
public static byte[] DecryptPayload(byte senderId, byte receiverId, byte[] homeId, byte sequenceNumber, byte[] receiverNonce,
byte[] senderNonce, byte[] networkKey, int generationCount, bool isRealKey, byte[] fullMessageS2, out int currentGenerationCount)
{
byte[] ret = null;
currentGenerationCount = 0;
if (fullMessageS2 != null && fullMessageS2.Length > 2)
{
var msgEncap = (COMMAND_CLASS_SECURITY_2.SECURITY_2_MESSAGE_ENCAPSULATION)fullMessageS2;
var peerNodeId = new InvariantPeerNodeId(0);
var mpanKey = new byte[SecurityS2Utils.KEY_SIZE];
var ccmKey = new byte[SecurityS2Utils.KEY_SIZE];
var personalization = new byte[SecurityS2Utils.PERSONALIZATION_SIZE];
if (isRealKey)
{
SecurityS2Utils.NetworkKeyExpand(networkKey, ccmKey, personalization, mpanKey);
}
else
{
SecurityS2Utils.TempKeyExpand(networkKey, ccmKey, personalization, mpanKey);
}
SpanTable spanTable = new SpanTable();
spanTable.Add(peerNodeId, receiverNonce, 0, 0);
SpanContainer spanContainer = spanTable.GetContainer(peerNodeId);
spanContainer.InstantiateWithSenderNonce(senderNonce, personalization);
var messageLength = (ushort)fullMessageS2.Length;
AAD aad = new AAD
{
SenderNodeId = senderId,
ReceiverNodeId = receiverId,
HomeId = homeId,
PayloadLength = messageLength,
SequenceNumber = sequenceNumber,
StatusByte = msgEncap.properties1
};
if (msgEncap.properties1.extension == 1)
{
var dataList = new List <byte>();
foreach (var vg1 in msgEncap.vg1)
{
dataList.AddRange(new byte[] { vg1.extensionLength, vg1.properties1 });
dataList.AddRange(vg1.extension);
}
aad.ExtensionData = dataList.ToArray();
}
for (int i = 0; i < generationCount; i++)
{
spanContainer.NextNonce();
ret = SecurityS2Utils.CcmDecryptAndAuth(ccmKey, spanContainer.Span, aad, msgEncap.ccmCiphertextObject.ToArray());
if (ret != null && ret.Length > 0)
{
currentGenerationCount = i + 1;
break;
}
}
}
return(ret);
}