/// <summary>
/// Reserved for internal use.
/// </summary>
/// <param name="buff"></param>
/// <param name="index"></param>
internal void EncodeData(byte[] buff, ref int index)
{
int tag = buff[index++];
if (tag != 0xA1)
{
throw new Exception("Invalid tag.");
}
//Get length.
int len = buff[index++];
if (buff.Length - index < len)
{
throw new Exception("Encoding failed. Not enough data.");
}
if (buff[index++] != 0x6)
{
throw new Exception("Encoding failed. Not an Object ID.");
}
//Object ID length.
len = buff[index++];
//Compare Object ID to check is Logical name used.
UseLN = GXCommon.Compare(buff, ref index, GXCommon.LogicalNameObjectID);
if (!UseLN)
{
index += GXCommon.ShortNameObjectID.Length;
}
}
public override bool Equals(object obj)
{
if (obj is GXPrivateKey pk)
{
return(GXCommon.Compare(RawValue, pk.RawValue));
}
return(false);
}
public override bool Equals(object obj)
{
if (obj is GXPublicKey o)
{
return(GXCommon.Compare(RawValue, o.RawValue));
}
return(false);
}
/// <summary>
/// Decrypt data using AES RFC3394.
/// </summary>
/// <param name="input">Decrypted data.</param>
internal byte[] DecryptAes(byte[] input)
{
int n = input.Length / 8;
if ((n * 8) != input.Length)
{
throw new ArgumentOutOfRangeException("Invalid data.");
}
byte[] iv = { 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6 };
byte[] block;
if (input.Length > iv.Length)
{
block = new byte[input.Length - iv.Length];
}
else
{
block = new byte[iv.Length];
}
byte[] a = new byte[iv.Length];
byte[] buf = new byte[8 + iv.Length];
Array.Copy(input, 0, a, 0, iv.Length);
Array.Copy(input, 0 + iv.Length, block, 0, input.Length - iv.Length);
n = n - 1;
if (n == 0)
{
n = 1;
}
for (int j = 5; j >= 0; j--)
{
for (int i = n; i >= 1; i--)
{
Array.Copy(a, 0, buf, 0, iv.Length);
Array.Copy(block, 8 * (i - 1), buf, iv.Length, 8);
int t = n * j + i;
for (int k = 1; t != 0; k++)
{
byte v = (byte)t;
buf[iv.Length - k] ^= v;
t = (int)((uint)t >> 8);
}
ProcessBlock(buf, 0, buf, 0);
Array.Copy(buf, 0, a, 0, 8);
Array.Copy(buf, 8, block, 8 * (i - 1), 8);
}
}
if (!GXCommon.Compare(a, iv))
{
throw new ArithmeticException("Invalid CRC");
}
return(block);
}
byte[] IGXDLMSBase.Invoke(GXDLMSSettings settings, int index, Object parameters)
{
//Check reply_to_HLS_authentication
if (index == 1)
{
UInt32 ic = 0;
byte[] secret;
if (settings.Authentication == Authentication.HighGMAC)
{
secret = settings.SourceSystemTitle;
GXByteBuffer bb = new GXByteBuffer(parameters as byte[]);
bb.GetUInt8();
ic = bb.GetUInt32();
}
else
{
secret = Secret;
}
byte[] serverChallenge = GXSecure.Secure(settings, settings.Cipher, ic, settings.StoCChallenge, secret);
byte[] clientChallenge = (byte[])parameters;
if (GXCommon.Compare(serverChallenge, clientChallenge))
{
if (settings.Authentication == Authentication.HighGMAC)
{
secret = settings.Cipher.SystemTitle;
}
else
{
secret = Secret;
}
ic = settings.Cipher.FrameCounter;
byte[] tmp = GXSecure.Secure(settings, settings.Cipher, ic, settings.CtoSChallenge, secret);
GXByteBuffer challenge = new GXByteBuffer();
// ReturnParameters.
challenge.SetUInt8(1);
challenge.SetUInt8(0);
challenge.SetUInt8((byte)DataType.OctetString);
GXCommon.SetObjectCount(tmp.Length, challenge);
challenge.Set(tmp);
return(challenge.Array());
}
else
{
throw new ArgumentException("Invoke failed. Invalid attribute index.");
}
}
else
{
throw new ArgumentException("Invoke failed. Invalid attribute index.");
}
}
byte[] IGXDLMSBase.Invoke(GXDLMSSettings settings, ValueEventArgs e)
{
//Check reply_to_HLS_authentication
if (e.Index == 8)
{
UInt32 ic = 0;
byte[] secret;
if (settings.Authentication == Authentication.HighGMAC)
{
secret = settings.SourceSystemTitle;
GXByteBuffer bb = new GXByteBuffer(e.Parameters as byte[]);
bb.GetUInt8();
ic = bb.GetUInt32();
}
else
{
secret = Secret;
}
byte[] serverChallenge = GXSecure.Secure(settings, settings.Cipher, ic, settings.StoCChallenge, secret);
byte[] clientChallenge = (byte[])e.Parameters;
if (GXCommon.Compare(serverChallenge, clientChallenge))
{
if (settings.Authentication == Authentication.HighGMAC)
{
secret = settings.Cipher.SystemTitle;
ic = settings.Cipher.InvocationCounter;
}
else
{
secret = Secret;
}
settings.Connected = true;
return(GXSecure.Secure(settings, settings.Cipher, ic, settings.CtoSChallenge, secret));
}
else
{
// If the password does not match.
settings.Connected = false;
return(null);
}
}
else
{
e.Error = ErrorCode.ReadWriteDenied;
return(null);
}
}
byte[][] IGXDLMSBase.Invoke(object sender, int index, Object parameters)
{
//Check reply_to_HLS_authentication
if (index == 8)
{
GXDLMSServerBase s = sender as GXDLMSServerBase;
if (s == null)
{
throw new ArgumentException("sender");
}
GXDLMS b = s.m_Base;
//Get server Challenge.
List <byte> challenge = null;
List <byte> CtoS = null;
//Find shared secret
foreach (GXAuthentication it in s.Authentications)
{
if (it.Type == b.Authentication)
{
CtoS = new List <byte>(it.SharedSecret);
challenge = new List <byte>(it.SharedSecret);
challenge.AddRange(b.StoCChallenge);
break;
}
}
byte[] serverChallenge = GXDLMS.Chipher(b.Authentication, challenge.ToArray(), null);
byte[] clientChallenge = (byte[])parameters;
int pos = 0;
if (GXCommon.Compare(clientChallenge, ref pos, serverChallenge))
{
CtoS.AddRange(b.CtoSChallenge);
return(s.Acknowledge(Command.WriteResponse, 0, GXDLMS.Chipher(b.Authentication, CtoS.ToArray(), null), DataType.OctetString));
}
else
{
//Return HW error.
return(s.ServerReportError(Command.MethodRequest, 1));
}
}
else
{
throw new ArgumentException("Invoke failed. Invalid attribute index.");
}
}
byte[] IGXDLMSBase.Invoke(GXDLMSSettings settings, ValueEventArgs e)
{
//Check reply_to_HLS_authentication
if (e.Index == 1)
{
UInt32 ic = 0;
byte[] secret;
if (settings.Authentication == Authentication.HighGMAC)
{
secret = settings.SourceSystemTitle;
GXByteBuffer bb = new GXByteBuffer(e.Parameters as byte[]);
bb.GetUInt8();
ic = bb.GetUInt32();
}
else
{
secret = Secret;
}
byte[] serverChallenge = GXSecure.Secure(settings, settings.Cipher, ic, settings.StoCChallenge, secret);
byte[] clientChallenge = (byte[])e.Parameters;
if (serverChallenge != null && clientChallenge != null && GXCommon.Compare(serverChallenge, clientChallenge))
{
if (settings.Authentication == Authentication.HighGMAC)
{
secret = settings.Cipher.SystemTitle;
ic = settings.Cipher.InvocationCounter;
}
else
{
secret = Secret;
}
AssociationStatus = AssociationStatus.Associated;
return(GXSecure.Secure(settings, settings.Cipher, ic, settings.CtoSChallenge, secret));
}
else //If the password does not match.
{
AssociationStatus = AssociationStatus.NonAssociated;
return(null);
}
}
else if (e.Index == 2)
{
byte[] tmp = e.Parameters as byte[];
if (tmp == null || tmp.Length == 0)
{
e.Error = ErrorCode.ReadWriteDenied;
}
else
{
Secret = tmp;
}
}
else if (e.Index == 3)
{
//Add COSEM object.
GXDLMSObject obj = GetObject(settings, e.Parameters as object[]);
//Unknown objects are not add.
if (obj is IGXDLMSBase)
{
if (ObjectList.FindByLN(obj.ObjectType, obj.LogicalName) == null)
{
ObjectList.Add(obj);
}
if (settings.Objects.FindByLN(obj.ObjectType, obj.LogicalName) == null)
{
settings.Objects.Add(obj);
}
}
}
else if (e.Index == 4)
{
//Remove COSEM object.
GXDLMSObject obj = GetObject(settings, e.Parameters as object[]);
//Unknown objects are not removed.
if (obj is IGXDLMSBase)
{
GXDLMSObject t = ObjectList.FindByLN(obj.ObjectType, obj.LogicalName);
if (t != null)
{
ObjectList.Remove(t);
}
//Item is not removed from all objects. It might be that use wants remove object only from association view.
}
}
else if (e.Index == 5)
{
object[] tmp = e.Parameters as object[];
if (tmp == null || tmp.Length != 2)
{
e.Error = ErrorCode.ReadWriteDenied;
}
else
{
UserList.Add(new KeyValuePair <byte, string>(Convert.ToByte(tmp[0]), Convert.ToString(tmp[1])));
}
}
else if (e.Index == 6)
{
object[] tmp = e.Parameters as object[];
if (tmp == null || tmp.Length != 2)
{
e.Error = ErrorCode.ReadWriteDenied;
}
else
{
UserList.Remove(new KeyValuePair <byte, string>(Convert.ToByte(tmp[0]), Convert.ToString(tmp[1])));
}
}
else
{
e.Error = ErrorCode.ReadWriteDenied;
}
return(null);
}
/// <summary>
/// Ask Gurux certificate server to generate the new certificate.
/// </summary>
/// <param name="address">Certificate server address.</param>
/// <param name="certifications">List of certification types and PKCS #10 certificates.</param>
/// <returns>Generated certificate(s).</returns>
public static GXx509Certificate[] GetCertificate(string address, List <KeyValuePair <CertificateType, GXPkcs10> > certifications)
{
StringBuilder usage = new StringBuilder();
foreach (KeyValuePair <CertificateType, GXPkcs10> it in certifications)
{
if (usage.Length != 0)
{
usage.Append(", ");
}
usage.Append("{\"KeyUsage\":");
switch (it.Key)
{
case CertificateType.DigitalSignature:
usage.Append(Convert.ToString((int)KeyUsage.DigitalSignature));
break;
case CertificateType.KeyAgreement:
usage.Append(Convert.ToString((int)KeyUsage.KeyAgreement));
break;
default:
throw new Exception("Invalid type.");
}
usage.Append(", \"CSR\":\"");
usage.Append(it.Value.ToDer());
usage.Append("\"}");
}
HttpWebRequest request = HttpWebRequest.Create(address) as HttpWebRequest;
string der = "{\"Certificates\":[" + usage.ToString() + "]}";
request.ContentType = "application/json";
request.Method = "POST";
using (var streamWriter = new StreamWriter(request.GetRequestStream()))
{
streamWriter.Write(der);
streamWriter.Flush();
streamWriter.Close();
}
try
{
using (HttpWebResponse webresponse = request.GetResponse() as HttpWebResponse)
{
using (StreamReader reader = new StreamReader(webresponse.GetResponseStream()))
{
string str = reader.ReadToEnd();
int pos = str.IndexOf("[");
if (pos == -1)
{
throw new Exception("Certificates are missing.");
}
str = str.Substring(pos + 2);
pos = str.IndexOf("]");
if (pos == -1)
{
throw new Exception("Certificates are missing.");
}
str = str.Substring(0, pos - 1);
List <GXx509Certificate> list = new List <GXx509Certificate>();
string[] tmp = str.Split(new string[] { "\"", "," }, StringSplitOptions.RemoveEmptyEntries);
pos = 0;
foreach (string it in tmp)
{
GXx509Certificate x509 = GXx509Certificate.FromDer(it);
if (!GXCommon.Compare(certifications[pos].Value.PublicKey.RawValue, x509.PublicKey.RawValue))
{
throw new Exception("Create certificate signingRequest generated wrong public key.");
}
++pos;
list.Add(x509);
}
return(list.ToArray());
}
}
}
catch (WebException ex)
{
throw new Exception(new StreamReader(ex.Response.GetResponseStream()).ReadToEnd());
}
}
/// <summary>
/// Decrypt data.
/// </summary>
/// <param name="p">Decryption parameters</param>
/// <returns>Decrypted data.</returns>
public static byte[] DecryptAesGcm(AesGcmParameter p, GXByteBuffer data)
{
if (data == null || data.Size < 2)
{
throw new ArgumentOutOfRangeException("cryptedData");
}
byte[] tmp;
int len;
Command cmd = (Command)data.GetUInt8();
switch (cmd)
{
case Command.GeneralGloCiphering:
case Command.GeneralDedCiphering:
len = GXCommon.GetObjectCount(data);
if (len != 0)
{
p.SystemTitle = new byte[len];
data.Get(p.SystemTitle);
if (p.Xml != null && p.Xml.Comments)
{
p.Xml.AppendComment(GXCommon.SystemTitleToString(Standard.DLMS, p.SystemTitle, true));
}
}
if (p.SystemTitle == null || p.SystemTitle.Length != 8)
{
if (p.Xml == null)
{
throw new ArgumentNullException("Invalid sender system title.");
}
else
{
p.Xml.AppendComment("Invalid sender system title.");
}
}
break;
case Command.GeneralCiphering:
case Command.GloInitiateRequest:
case Command.GloInitiateResponse:
case Command.GloReadRequest:
case Command.GloReadResponse:
case Command.GloWriteRequest:
case Command.GloWriteResponse:
case Command.GloGetRequest:
case Command.GloGetResponse:
case Command.GloSetRequest:
case Command.GloSetResponse:
case Command.GloMethodRequest:
case Command.GloMethodResponse:
case Command.GloEventNotification:
case Command.DedInitiateRequest:
case Command.DedInitiateResponse:
case Command.DedGetRequest:
case Command.DedGetResponse:
case Command.DedSetRequest:
case Command.DedSetResponse:
case Command.DedMethodRequest:
case Command.DedMethodResponse:
case Command.DedEventNotification:
case Command.DedReadRequest:
case Command.DedReadResponse:
case Command.DedWriteRequest:
case Command.DedWriteResponse:
case Command.GloConfirmedServiceError:
case Command.DedConfirmedServiceError:
break;
default:
throw new ArgumentOutOfRangeException("cryptedData");
}
int value = 0;
GXPrivateKey key = null;
GXPublicKey pub = null;
GXByteBuffer transactionId = null;
if (cmd == Command.GeneralCiphering)
{
transactionId = new GXByteBuffer();
len = GXCommon.GetObjectCount(data);
GXCommon.SetObjectCount(len, transactionId);
transactionId.Set(data, len);
p.TransactionId = transactionId.GetUInt64(1);
len = GXCommon.GetObjectCount(data);
if (len != 0)
{
tmp = new byte[len];
data.Get(tmp);
p.SystemTitle = tmp;
}
if (p.SystemTitle == null || p.SystemTitle.Length != 8)
{
if (p.Xml == null)
{
throw new ArgumentNullException("Invalid sender system title.");
}
else
{
p.Xml.AppendComment("Invalid sender system title.");
}
}
len = GXCommon.GetObjectCount(data);
tmp = new byte[len];
data.Get(tmp);
p.RecipientSystemTitle = tmp;
// Get date time.
len = GXCommon.GetObjectCount(data);
if (len != 0)
{
tmp = new byte[len];
data.Get(tmp);
p.DateTime = tmp;
}
// other-information
len = data.GetUInt8();
if (len != 0)
{
tmp = new byte[len];
data.Get(tmp);
p.OtherInformation = tmp;
}
// KeyInfo OPTIONAL
len = data.GetUInt8();
// AgreedKey CHOICE tag.
data.GetUInt8();
// key-parameters
len = data.GetUInt8();
value = data.GetUInt8();
p.KeyParameters = value;
if (value == (int)KeyAgreementScheme.OnePassDiffieHellman)
{
// key-ciphered-data
len = GXCommon.GetObjectCount(data);
GXByteBuffer bb = new GXByteBuffer();
bb.Set(data, len);
if (p.Xml != null)
{
p.KeyCipheredData = bb.Array();
//Find key agreement key using subject.
string subject = GXAsn1Converter.SystemTitleToSubject(p.SystemTitle);
foreach (KeyValuePair <GXPkcs8, GXx509Certificate> it in p.Settings.Keys)
{
if (it.Key != null && it.Value.KeyUsage == ASN.Enums.KeyUsage.KeyAgreement && it.Value.Subject.Contains(subject))
{
key = it.Key.PrivateKey;
//Get recipient Ephemeral public key.
subject = GXAsn1Converter.SystemTitleToSubject(p.RecipientSystemTitle);
foreach (KeyValuePair <GXPkcs8, GXx509Certificate> it2 in p.Settings.Keys)
{
if (it2.Value != null && it2.Value.KeyUsage == ASN.Enums.KeyUsage.KeyAgreement && it2.Value.Subject.Contains(subject))
{
pub = it2.Value.PublicKey;
break;
}
}
break;
}
}
if (key == null)
{
//Find key agreement key using subject.
subject = GXAsn1Converter.SystemTitleToSubject(p.RecipientSystemTitle);
foreach (KeyValuePair <GXPkcs8, GXx509Certificate> it in p.Settings.Keys)
{
if (it.Key != null && it.Value.KeyUsage == ASN.Enums.KeyUsage.KeyAgreement && it.Value.Subject.Contains(subject))
{
key = it.Key.PrivateKey;
break;
}
}
}
}
else
{
key = p.Settings.Cipher.KeyAgreementKeyPair.Key;
}
if (key != null && pub == null)
{
//Get Ephemeral public key.
int keySize = len / 2;
pub = GXPublicKey.FromRawBytes(bb.SubArray(0, keySize));
}
}
else if (value == (int)KeyAgreementScheme.StaticUnifiedModel)
{
len = GXCommon.GetObjectCount(data);
if (len != 0)
{
throw new ArgumentException("Invalid key parameters");
}
if (p.Xml != null)
{
//Find key agreement key using subject.
string subject = GXAsn1Converter.SystemTitleToSubject(p.RecipientSystemTitle);
foreach (KeyValuePair <GXPkcs8, GXx509Certificate> it in p.Settings.Keys)
{
if (it.Value.KeyUsage == ASN.Enums.KeyUsage.KeyAgreement && it.Value.Subject.Contains(subject))
{
key = it.Key.PrivateKey;
break;
}
}
if (key != null)
{
//Find key agreement key using subject.
subject = GXAsn1Converter.SystemTitleToSubject(p.Settings.SourceSystemTitle);
foreach (KeyValuePair <GXPkcs8, GXx509Certificate> it in p.Settings.Keys)
{
if (it.Value.KeyUsage == ASN.Enums.KeyUsage.KeyAgreement && it.Value.Subject.Contains(subject))
{
pub = it.Value.PublicKey;
break;
}
}
}
}
else
{
key = p.Settings.Cipher.KeyAgreementKeyPair.Key;
pub = p.Settings.Cipher.KeyAgreementKeyPair.Value;
}
}
else
{
throw new ArgumentException("key-parameters");
}
}
len = GXCommon.GetObjectCount(data);
if (len > data.Available)
{
throw new Exception("Not enought data.");
}
p.CipheredContent = data.Remaining();
byte sc = data.GetUInt8();
p.SecuritySuite = (SecuritySuite)(sc & 0x3);
p.Security = (Security)(sc & 0x30);
if ((sc & 0x80) != 0)
{
System.Diagnostics.Debug.WriteLine("Compression is used.");
}
if ((sc & 0x40) != 0)
{
System.Diagnostics.Debug.WriteLine("Error: Key_Set is used.");
}
if ((sc & 0x20) != 0)
{
System.Diagnostics.Debug.WriteLine("Encryption is applied.");
}
if (key != null)
{
if (value == (int)KeyAgreementScheme.OnePassDiffieHellman)
{
GXEcdsa c = new GXEcdsa(key);
//Get Ephemeral signing key and verify it.
byte[] z = c.GenerateSecret(pub);
System.Diagnostics.Debug.WriteLine("Originator ephemeral public key: " + pub.ToHex());
System.Diagnostics.Debug.WriteLine("Recipient private agreement key: " + key.ToHex());
System.Diagnostics.Debug.WriteLine("Shared secret:" + GXCommon.ToHex(z, true));
GXByteBuffer kdf = new GXByteBuffer();
kdf.Set(GXSecure.GenerateKDF(p.SecuritySuite, z,
p.SecuritySuite == SecuritySuite.Ecdsa256 ? AlgorithmId.AesGcm128 : AlgorithmId.AesGcm256,
p.SystemTitle,
p.RecipientSystemTitle,
null, null));
System.Diagnostics.Debug.WriteLine("KDF:" + kdf.ToString());
p.BlockCipherKey = kdf.SubArray(0, 16);
}
else if (value == (int)KeyAgreementScheme.StaticUnifiedModel)
{
GXEcdsa c = new GXEcdsa(key);
byte[] z = c.GenerateSecret(pub);
System.Diagnostics.Debug.WriteLine("Shared secret:" + GXCommon.ToHex(z, true));
GXByteBuffer kdf = new GXByteBuffer();
kdf.Set(GXSecure.GenerateKDF(p.SecuritySuite, z,
p.SecuritySuite == SecuritySuite.Ecdsa256 ? AlgorithmId.AesGcm128 : AlgorithmId.AesGcm256,
p.SystemTitle,
transactionId.Array(),
p.RecipientSystemTitle,
null));
System.Diagnostics.Debug.WriteLine("KDF:" + kdf.ToString());
p.BlockCipherKey = kdf.SubArray(0, 16);
}
else
{
throw new ArgumentOutOfRangeException("Invalid Key-id value.");
}
}
UInt32 invocationCounter = data.GetUInt32();
p.InvocationCounter = invocationCounter;
System.Diagnostics.Debug.WriteLine("Decrypt settings: " + p.ToString());
System.Diagnostics.Debug.WriteLine("Encrypted: " + GXCommon.ToHex(data.Data,
false, data.Position, data.Size - data.Position));
byte[] tag = new byte[12];
byte[] encryptedData;
int length;
if (p.Security == Security.Authentication)
{
length = data.Size - data.Position - 12;
encryptedData = new byte[length];
data.Get(encryptedData);
data.Get(tag);
// Check tag.
EncryptAesGcm(p, encryptedData);
if (!GXDLMSChipperingStream.TagsEquals(tag, p.CountTag))
{
if (p.Xml == null)
{
throw new GXDLMSException("Decrypt failed. Invalid tag.");
}
else
{
p.Xml.AppendComment("Decrypt failed. Invalid tag.");
}
}
return(encryptedData);
}
byte[] ciphertext = null;
if (p.Security == Security.Encryption)
{
length = data.Size - data.Position;
ciphertext = new byte[length];
data.Get(ciphertext);
}
else if (p.Security == Security.AuthenticationEncryption)
{
length = data.Size - data.Position - 12;
ciphertext = new byte[length];
data.Get(ciphertext);
data.Get(tag);
}
byte[] aad = GetAuthenticatedData(p, ciphertext),
iv = GetNonse(invocationCounter, p.SystemTitle);
GXDLMSChipperingStream gcm = new GXDLMSChipperingStream(p.Security, true,
p.BlockCipherKey, aad, iv, tag);
gcm.Write(ciphertext);
byte[] decrypted = gcm.FlushFinalBlock();
System.Diagnostics.Debug.WriteLine("Decrypted: " + GXCommon.ToHex(decrypted, true));
if (p.Security != Security.Encryption)
{
if (!GXCommon.Compare(gcm.GetTag(), tag))
{
if (p.Xml == null)
{
throw new Exception("Decrypt failed. Invalid authentication tag.");
}
p.Xml.AppendComment("Decrypt failed. Invalid authentication tag.");
}
}
return(decrypted);
}
byte[] IGXDLMSBase.Invoke(GXDLMSSettings settings, ValueEventArgs e)
{
//Check reply_to_HLS_authentication
if (e.Index == 1)
{
UInt32 ic = 0;
byte[] secret;
if (settings.Authentication == Authentication.HighGMAC)
{
secret = settings.SourceSystemTitle;
GXByteBuffer bb = new GXByteBuffer(e.Parameters as byte[]);
bb.GetUInt8();
ic = bb.GetUInt32();
}
else
{
secret = Secret;
}
byte[] serverChallenge = GXSecure.Secure(settings, settings.Cipher, ic, settings.StoCChallenge, secret);
byte[] clientChallenge = (byte[])e.Parameters;
if (serverChallenge != null && clientChallenge != null && GXCommon.Compare(serverChallenge, clientChallenge))
{
if (settings.Authentication == Authentication.HighGMAC)
{
secret = settings.Cipher.SystemTitle;
ic = settings.Cipher.InvocationCounter;
}
else
{
secret = Secret;
}
settings.Connected = true;
return(GXSecure.Secure(settings, settings.Cipher, ic, settings.CtoSChallenge, secret));
}
else //If the password does not match.
{
settings.Connected = false;
return(null);
}
}
else if (e.Index == 2)
{
byte[] tmp = e.Parameters as byte[];
if (tmp == null || tmp.Length == 0)
{
e.Error = ErrorCode.ReadWriteDenied;
}
else
{
Secret = tmp;
}
}
else if (e.Index == 5)
{
object[] tmp = e.Parameters as object[];
if (tmp == null || tmp.Length != 2)
{
e.Error = ErrorCode.ReadWriteDenied;
}
else
{
UserList.Add(new KeyValuePair <byte, string>(Convert.ToByte(tmp[0]), Convert.ToString(tmp[1])));
}
}
else if (e.Index == 6)
{
object[] tmp = e.Parameters as object[];
if (tmp == null || tmp.Length != 2)
{
e.Error = ErrorCode.ReadWriteDenied;
}
else
{
UserList.Remove(new KeyValuePair <byte, string>(Convert.ToByte(tmp[0]), Convert.ToString(tmp[1])));
}
}
else
{
e.Error = ErrorCode.ReadWriteDenied;
}
return(null);
}