/// <summary>
/// Generate user information.
/// </summary>
/// <param name="settings">DLMS settings.</param>
/// <param name="cipher"></param>
/// <param name="data">Generated user information.</param>
static internal void GenerateUserInformation(GXDLMSSettings settings, GXICipher cipher, GXByteBuffer data)
{
data.SetUInt8((byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.UserInformation);
if (cipher == null || !cipher.IsCiphered())
{
//Length for AARQ user field
data.SetUInt8(0x10);
//Coding the choice for user-information (Octet STRING, universal)
data.SetUInt8(BerType.OctetString);
//Length
data.SetUInt8(0x0E);
GetInitiateRequest(settings, cipher, data);
}
else
{
GXByteBuffer tmp = new GXByteBuffer();
GetInitiateRequest(settings, cipher, tmp);
byte[] crypted = cipher.Encrypt(0x21, cipher.SystemTitle, tmp.Array());
//Length for AARQ user field
data.SetUInt8((byte)(2 + crypted.Length));
//Coding the choice for user-information (Octet STRING, universal)
data.SetUInt8(BerType.OctetString);
data.SetUInt8((byte)crypted.Length);
data.Set(crypted);
}
}
/// <summary>
/// Generate User information initiate request.
/// </summary>
/// <param name="settings">DLMS settings.</param>
/// <param name="cipher"></param>
/// <param name="data"></param>
private static void GetInitiateRequest(GXDLMSSettings settings, GXICipher cipher, GXByteBuffer data)
{
// Tag for xDLMS-Initiate request
data.SetUInt8(GXCommon.InitialRequest);
// Usage field for dedicated-key component. Not used
data.SetUInt8(0x00);
//encoding of the response-allowed component (BOOLEAN DEFAULT TRUE)
// usage flag (FALSE, default value TRUE conveyed)
data.SetUInt8(0);
// Usage field of the proposed-quality-of-service component. Not used
data.SetUInt8(0x00);
data.SetUInt8(settings.DLMSVersion);
// Tag for conformance block
data.SetUInt8(0x5F);
data.SetUInt8(0x1F);
// length of the conformance block
data.SetUInt8(0x04);
// encoding the number of unused bits in the bit string
data.SetUInt8(0x00);
if (settings.UseLogicalNameReferencing)
{
data.Set(settings.LnSettings.ConformanceBlock);
}
else
{
data.Set(settings.SnSettings.ConformanceBlock);
}
data.SetUInt16(settings.MaxReceivePDUSize);
}
///<summary>
/// Generates Aarq.
///</summary>
static internal void GenerateAarq(GXDLMSSettings settings, GXICipher cipher, GXByteBuffer data)
{
//AARQ APDU Tag
data.SetUInt8(BerType.Application | BerType.Constructed);
//Length is updated later.
UInt16 offset = data.Size;
data.SetUInt8(0);
///////////////////////////////////////////
// Add Application context name.
GenerateApplicationContextName(settings, data, cipher);
GetAuthenticationString(settings, data);
GenerateUserInformation(settings, cipher, data);
data.SetUInt8(offset, (byte)(data.Size - offset - 1));
}
private static byte[] GetUserInformation(GXDLMSSettings settings, GXICipher cipher)
{
GXByteBuffer data = new GXByteBuffer();
data.SetUInt8(GXCommon.InitialResponce); // Tag for xDLMS-Initiate response
// NegotiatedQualityOfService (not used)
data.SetUInt8(0x1);
data.SetUInt8(0x00);
// DLMS Version Number
data.SetUInt8(06);
data.SetUInt8(0x5F);
data.SetUInt8(0x1F);
data.SetUInt8(0x04); // length of the conformance block
data.SetUInt8(0x00); // encoding the number of unused bits in the bit string
if (settings.UseLogicalNameReferencing)
{
data.Set(settings.LnSettings.ConformanceBlock);
}
else
{
data.Set(settings.SnSettings.ConformanceBlock);
}
data.SetUInt16(settings.MaxReceivePDUSize);
//VAA Name VAA name (0x0007 for LN referencing and 0xFA00 for SN)
if (settings.UseLogicalNameReferencing)
{
data.SetUInt16(0x0007);
}
else
{
data.SetUInt16(0xFA00);
}
if (cipher != null && cipher.IsCiphered())
{
return(cipher.Encrypt(0x28, cipher.SystemTitle, data.Array()));
}
return(data.Array());
}
/// <summary>
/// Code application context name.
/// </summary>
/// <param name="settings">DLMS settings.</param>
/// <param name="data">Byte buffer where data is saved.</param>
/// <param name="cipher">Is ciphering settings.</param>
private static void GenerateApplicationContextName(GXDLMSSettings settings, GXByteBuffer data, GXICipher cipher)
{
//Application context name tag
data.SetUInt8(((byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.ApplicationContextName));
//Len
data.SetUInt8(0x09);
data.SetUInt8(BerType.ObjectIdentifier);
//Len
data.SetUInt8(0x07);
bool ciphered = cipher != null && cipher.IsCiphered();
if (settings.UseLogicalNameReferencing)
{
if (ciphered)
{
data.Set(GXCommon.LogicalNameObjectIdWithCiphering);
}
else
{
data.Set(GXCommon.LogicalNameObjectID);
}
}
else
{
if (ciphered)
{
data.Set(GXCommon.ShortNameObjectIdWithCiphering);
}
else
{
data.Set(GXCommon.ShortNameObjectID);
}
}
//Add system title if cipher or GMAC authentication is used..
if (!settings.IsServer && (ciphered || settings.Authentication == Authentication.HighGMAC))
{
if (cipher.SystemTitle == null || cipher.SystemTitle.Length == 0)
{
throw new ArgumentNullException("SystemTitle");
}
//Add calling-AP-title
data.SetUInt8(((byte)BerType.Context | (byte)BerType.Constructed | 6));
//LEN
data.SetUInt8((byte)(2 + cipher.SystemTitle.Length));
data.SetUInt8((byte)BerType.OctetString);
//LEN
data.SetUInt8((byte)cipher.SystemTitle.Length);
data.Set(cipher.SystemTitle);
}
}
///<summary>
/// Chipher text.
///</summary>
///<param name="settings">
///DLMS settings.
///</param>
///<param name="cipher">
///Cipher.
///</param>
///<param name="ic">
///Invocation counter.
///</param>
///<param name="data">
///Text to chipher.
///</param>
///<param name="secret">
///Secret.
///</param>
///<returns>
///Chiphered text.
///</returns>
public static byte[] Secure(GXDLMSSettings settings, GXICipher cipher, uint ic, byte[] data, byte[] secret)
{
byte[] tmp;
if (settings.Authentication == Authentication.High)
{
int len = secret.Length;
if (len % 16 != 0)
{
len += 16 - (secret.Length % 16);
}
byte[] p = new byte[len];
byte[] s = new byte[16];
byte[] x = new byte[16];
int i;
data.CopyTo(p, 0);
secret.CopyTo(s, 0);
for (i = 0; i < p.Length; i += 16)
{
Buffer.BlockCopy(p, i, x, 0, 16);
GXAes128.Encrypt(x, s);
Buffer.BlockCopy(x, 0, p, i, 16);
}
Buffer.BlockCopy(p, 0, x, 0, 16);
return(x);
}
// Get server Challenge.
GXByteBuffer challenge = new GXByteBuffer();
// Get shared secret
if (settings.Authentication == Authentication.HighGMAC)
{
challenge.Set(data);
}
else
{
challenge.Set(data);
challenge.Set(secret);
}
tmp = challenge.Array();
if (settings.Authentication == Authentication.HighMD5)
{
#if !WINDOWS_UWP
using (MD5 md5Hash = MD5.Create())
{
tmp = md5Hash.ComputeHash(tmp);
return(tmp);
}
#endif
}
else if (settings.Authentication == Authentication.HighSHA1)
{
#if !WINDOWS_UWP
using (SHA1 sha = new SHA1CryptoServiceProvider())
{
tmp = sha.ComputeHash(tmp);
return(tmp);
}
#endif
}
else if (settings.Authentication == Authentication.HighGMAC)
{
//SC is always Security.Authentication.
AesGcmParameter p = new AesGcmParameter(0, Security.Authentication, ic,
secret, cipher.BlockCipherKey, cipher.AuthenticationKey);
p.Type = CountType.Tag;
challenge.Clear();
challenge.SetUInt8((byte)Security.Authentication);
challenge.SetUInt32(p.InvocationCounter);
challenge.Set(GXDLMSChippering.EncryptAesGcm(p, tmp));
tmp = challenge.Array();
return(tmp);
}
return(data);
}
/// <summary>
/// Code application context name.
/// </summary>
/// <param name="settings">DLMS settings.</param>
/// <param name="data">Byte buffer where data is saved.</param>
/// <param name="cipher">Is ciphering settings.</param>
private static void GenerateApplicationContextName(GXDLMSSettings settings, GXByteBuffer data, GXICipher cipher)
{
//Application context name tag
data.SetUInt8(((byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.ApplicationContextName));
//Len
data.SetUInt8(0x09);
data.SetUInt8(BerType.ObjectIdentifier);
//Len
data.SetUInt8(0x07);
bool ciphered = cipher != null && cipher.IsCiphered();
if (settings.UseLogicalNameReferencing)
{
if (ciphered)
{
data.Set(GXCommon.LogicalNameObjectIdWithCiphering);
}
else
{
data.Set(GXCommon.LogicalNameObjectID);
}
}
else
{
if (ciphered)
{
data.Set(GXCommon.ShortNameObjectIdWithCiphering);
}
else
{
data.Set(GXCommon.ShortNameObjectID);
}
}
//Add system title if cipher or GMAC authentication is used..
if (!settings.IsServer && (ciphered || settings.Authentication == Authentication.HighGMAC))
{
if (cipher.SystemTitle == null || cipher.SystemTitle.Length == 0)
{
throw new ArgumentNullException("SystemTitle");
}
//Add calling-AP-title
data.SetUInt8(((byte)BerType.Context | (byte)BerType.Constructed | 6));
//LEN
data.SetUInt8((byte)(2 + cipher.SystemTitle.Length));
data.SetUInt8((byte)BerType.OctetString);
//LEN
data.SetUInt8((byte)cipher.SystemTitle.Length);
data.Set(cipher.SystemTitle);
}
}
private static byte[] GetUserInformation(GXDLMSSettings settings, GXICipher cipher)
{
GXByteBuffer data = new GXByteBuffer();
data.SetUInt8(Command.InitiateResponse); // Tag for xDLMS-Initiate response
// NegotiatedQualityOfService (not used)
data.SetUInt8(0x1);
data.SetUInt8(0x00);
// DLMS Version Number
data.SetUInt8(06);
data.SetUInt8(0x5F);
data.SetUInt8(0x1F);
data.SetUInt8(0x04);// length of the conformance block
data.SetUInt8(0x00);// encoding the number of unused bits in the bit string
if (settings.UseLogicalNameReferencing)
{
data.Set(settings.LnSettings.ConformanceBlock);
}
else
{
data.Set(settings.SnSettings.ConformanceBlock);
}
data.SetUInt16(settings.MaxPduSize);
//VAA Name VAA name (0x0007 for LN referencing and 0xFA00 for SN)
if (settings.UseLogicalNameReferencing)
{
data.SetUInt16(0x0007);
}
else
{
data.SetUInt16(0xFA00);
}
if (cipher != null && cipher.IsCiphered())
{
return cipher.Encrypt((byte)Command.GloInitiateResponse, cipher.SystemTitle, data.Array());
}
return data.Array();
}
/// <summary>
/// Parse User Information from PDU.
/// </summary>
public static void ParseUserInformation(GXDLMSSettings settings, GXICipher cipher, GXByteBuffer data, GXDLMSTranslatorStructure xml)
{
byte len = data.GetUInt8();
GXByteBuffer tmp2 = new GXByteBuffer();
tmp2.SetUInt8(0);
if (data.Size - data.Position < len)
{
throw new Exception("Not enough data.");
}
if (xml != null && xml.OutputType == TranslatorOutputType.StandardXml)
{
len = (byte)(data.Size - data.Position);
xml.AppendLine(Command.InitiateRequest, null, GXCommon
.ToHex(data.Data, false, data.Position, len));
data.Position = data.Position + len;
return;
}
//Excoding the choice for user information
int tag = data.GetUInt8();
if (tag != 0x4)
{
throw new Exception("Invalid tag.");
}
len = data.GetUInt8();
//Tag for xDLMS-Initate.response
tag = data.GetUInt8();
if (tag == (byte)Command.GloInitiateResponse)
{
if (xml != null)
{
int cnt = GXCommon.GetObjectCount(data);
byte[] tmp = new byte[cnt];
data.Get(tmp);
//<glo_InitiateResponse>
xml.AppendLine(Command.GloInitiateResponse, "Value", GXCommon.ToHex(tmp, false));
return;
}
--data.Position;
cipher.Security = cipher.Decrypt(settings.SourceSystemTitle, data);
tag = data.GetUInt8();
}
else if (tag == (byte)Command.GloInitiateRequest)
{
if (xml != null)
{
int cnt = GXCommon.GetObjectCount(data);
byte[] tmp = new byte[cnt];
data.Get(tmp);
//<glo_InitiateRequest>
xml.AppendLine(Command.GloInitiateRequest, "Value", GXCommon.ToHex(tmp, false));
return;
}
--data.Position;
cipher.Security = cipher.Decrypt(settings.SourceSystemTitle, data);
tag = data.GetUInt8();
}
bool response = tag == (byte)Command.InitiateResponse;
if (response)
{
if (xml != null)
{
//<InitiateResponse>
xml.AppendStartTag(Command.InitiateResponse);
}
//Optional usage field of the negotiated quality of service component
tag = data.GetUInt8();
len = 0;
if (tag != 0)//Skip if used.
{
len = data.GetUInt8();
data.Position += len;
if (len == 0 && xml != null)
{
//NegotiatedQualityOfService
xml.AppendLine(TranslatorGeneralTags.NegotiatedQualityOfService, "Value", "00");
}
}
}
else if (tag == (byte)Command.InitiateRequest)
{
if (xml != null)
{
//<InitiateRequest>
xml.AppendStartTag(Command.InitiateRequest);
}
//Optional usage field of the negotiated quality of service component
tag = data.GetUInt8();
//CtoS.
if (tag != 0)
{
len = data.GetUInt8();
settings.CtoSChallenge = new byte[len];
data.Get(settings.CtoSChallenge);
}
//Optional usage field of the negotiated quality of service component
tag = data.GetUInt8();
if (tag != 0)//Skip if used.
{
len = data.GetUInt8();
data.Position += len;
}
//Optional usage field of the proposed quality of service component
tag = data.GetUInt8();
if (tag != 0)//Skip if used.
{
len = data.GetUInt8();
data.Position += len;
}
}
else
{
throw new Exception("Invalid tag.");
}
//Get DLMS version number.
if (!response)
{
if (data.GetUInt8() != 6)
{
throw new Exception("Invalid DLMS version number.");
}
//ProposedDlmsVersionNumber
if (xml != null)
{
xml.AppendLine(TranslatorGeneralTags.ProposedDlmsVersionNumber, "Value", xml.IntegerToHex(settings.DLMSVersion, 2));
}
}
else
{
if (data.GetUInt8() != 6)
{
throw new Exception("Invalid DLMS version number.");
}
if (xml != null)
{
xml.AppendLine(TranslatorGeneralTags.NegotiatedDlmsVersionNumber, "Value", xml.IntegerToHex(settings.DLMSVersion, 2));
}
}
//Tag for conformance block
tag = data.GetUInt8();
if (tag != 0x5F)
{
throw new Exception("Invalid tag.");
}
//Old Way...
if (data.GetUInt8(data.Position) == 0x1F)
{
data.GetUInt8();
}
len = data.GetUInt8();
//The number of unused bits in the bit string.
tag = data.GetUInt8();
if (!response)
{
//ProposedConformance
if (xml != null)
{
xml.AppendStartTag(TranslatorGeneralTags.ProposedConformance);
}
data.Get(settings.ConformanceBlock);
tmp2.Set(settings.ConformanceBlock);
}
else
{
//NegotiatedConformance
if (xml != null)
{
xml.AppendStartTag(TranslatorGeneralTags.NegotiatedConformance);
}
if (settings.UseLogicalNameReferencing)
{
data.Get(settings.LnSettings.ConformanceBlock);
tmp2.Set(settings.LnSettings.ConformanceBlock);
}
else
{
data.Get(settings.SnSettings.ConformanceBlock);
tmp2.Set(settings.SnSettings.ConformanceBlock);
}
}
if (xml != null)
{
GetConformance(tmp2.GetUInt32(), xml);
}
if (!response)
{
//Proposed max PDU size.
settings.MaxPduSize = data.GetUInt16();
if (xml != null)
{
//ProposedConformance closing
xml.AppendEndTag(TranslatorGeneralTags.ProposedConformance);
//ProposedMaxPduSize
xml.AppendLine(TranslatorGeneralTags.ProposedMaxPduSize, "Value", xml.IntegerToHex(settings.MaxPduSize, 4));
}
//If client asks too high PDU.
if (settings.MaxPduSize > settings.MaxServerPDUSize)
{
settings.MaxPduSize = settings.MaxServerPDUSize;
}
}
else
{
//Max PDU size.
settings.MaxPduSize = data.GetUInt16();
if (xml != null)
{
//NegotiatedConformance closing
xml.AppendEndTag(TranslatorGeneralTags.NegotiatedConformance);
//NegotiatedMaxPduSize
xml.AppendLine(TranslatorGeneralTags.NegotiatedMaxPduSize, "Value", xml.IntegerToHex(settings.MaxPduSize, 4));
}
}
if (response)
{
//VAA Name
tag = data.GetUInt16();
if (xml != null)
{
xml.AppendLine(TranslatorGeneralTags.VaaName, "Value", xml.IntegerToHex(tag, 4));
}
if (tag == 0x0007)
{
// If LN
if (!settings.UseLogicalNameReferencing)
{
throw new ArgumentException("Invalid VAA.");
}
}
else if (tag == 0xFA00)
{
// If SN
if (settings.UseLogicalNameReferencing)
{
throw new ArgumentException("Invalid VAA.");
}
}
else
{
// Unknown VAA.
throw new ArgumentException("Invalid VAA.");
}
if (xml != null)
{
//<InitiateResponse>
xml.AppendEndTag(Command.InitiateResponse);
}
}
else if (xml != null)
{
//</InitiateRequest>
xml.AppendEndTag(Command.InitiateRequest);
}
}
///<summary>
///Parse APDU.
///</summary>
static internal SourceDiagnostic ParsePDU(GXDLMSSettings settings, GXICipher cipher,
GXByteBuffer buff, GXDLMSTranslatorStructure xml)
{
// Get AARE tag and length
int tag = buff.GetUInt8();
if (settings.IsServer)
{
if (tag != ((byte)BerType.Application | (byte)BerType.Constructed | (byte)PduType.ProtocolVersion))
{
throw new Exception("Invalid tag.");
}
}
else
{
if (tag != ((byte)BerType.Application | (byte)BerType.Constructed | (byte)PduType.ApplicationContextName))
{
throw new Exception("Invalid tag.");
}
}
int len = buff.GetUInt8();
int size = buff.Size - buff.Position;
if (len > size)
{
throw new Exception("Not enough data.");
}
//Opening tags
if (xml != null)
{
if (settings.IsServer)
{
xml.AppendStartTag(Command.Aarq);
}
else
{
xml.AppendStartTag(Command.Aare);
}
}
AssociationResult resultComponent = AssociationResult.Accepted;
SourceDiagnostic resultDiagnosticValue = SourceDiagnostic.None;
while (buff.Position < buff.Size)
{
tag = buff.GetUInt8();
switch (tag)
{
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.ApplicationContextName://0xA1
if (!ParseApplicationContextName(settings, buff, xml))
{
throw new GXDLMSException(AssociationResult.PermanentRejected, SourceDiagnostic.ApplicationContextNameNotSupported);
}
break;
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.CalledApTitle://0xA2
//Get len.
if (buff.GetUInt8() != 3)
{
throw new Exception("Invalid tag.");
}
//Choice for result (INTEGER, universal)
if (buff.GetUInt8() != (byte)BerType.Integer)
{
throw new Exception("Invalid tag.");
}
//Get len.
if (buff.GetUInt8() != 1)
{
throw new Exception("Invalid tag.");
}
resultComponent = (AssociationResult)buff.GetUInt8();
if (xml != null)
{
xml.AppendLine(TranslatorGeneralTags.AssociationResult, "Value", xml.IntegerToHex((int)resultComponent, 2));
xml.AppendStartTag(TranslatorGeneralTags.ResultSourceDiagnostic);
}
break;
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.CalledAeQualifier:////SourceDiagnostic 0xA3
len = buff.GetUInt8();
// ACSE service user tag.
tag = buff.GetUInt8();
len = buff.GetUInt8();
// Result source diagnostic component.
if (buff.GetUInt8() != (byte)BerType.Integer)
{
throw new Exception("Invalid tag.");
}
if (buff.GetUInt8() != 1)
{
throw new Exception("Invalid tag.");
}
resultDiagnosticValue = (SourceDiagnostic)buff.GetUInt8();
if (xml != null)
{
xml.AppendLine(TranslatorGeneralTags.ACSEServiceUser, "Value", xml.IntegerToHex((int)resultDiagnosticValue, 2));
xml.AppendEndTag(TranslatorGeneralTags.ResultSourceDiagnostic);
}
break;
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.CalledApInvocationId:
////Result 0xA4
//Get len.
if (buff.GetUInt8() != 0xA)
{
throw new Exception("Invalid tag.");
}
//Choice for result (Universal, Octetstring type)
if (buff.GetUInt8() != (byte)BerType.OctetString)
{
throw new Exception("Invalid tag.");
}
//responding-AP-title-field
//Get len.
len = buff.GetUInt8();
settings.SourceSystemTitle = new byte[len];
buff.Get(settings.SourceSystemTitle);
if (xml != null)
{
//RespondingAPTitle
xml.AppendLine(TranslatorGeneralTags.RespondingAPTitle, "Value", GXCommon.ToHex(settings.SourceSystemTitle, false));
}
break;
//Client Challenge.
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.CallingApTitle://0xA6
len = buff.GetUInt8();
tag = buff.GetUInt8();
len = buff.GetUInt8();
settings.SourceSystemTitle = new byte[len];
buff.Get(settings.SourceSystemTitle);
if (xml != null)
{
//CallingAPTitle
xml.AppendLine(TranslatorGeneralTags.CallingAPTitle, "Value", GXCommon.ToHex(settings.SourceSystemTitle, false));
}
break;
//Server Challenge.
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.SenderAcseRequirements://0xAA
len = buff.GetUInt8();
tag = buff.GetUInt8();
len = buff.GetUInt8();
settings.StoCChallenge = new byte[len];
buff.Get(settings.StoCChallenge);
AppendServerSystemTitleToXml(settings, xml, tag);
break;
case (byte)BerType.Context | (byte)PduType.SenderAcseRequirements:
//0x8A
case (byte)BerType.Context | (byte)PduType.CallingApInvocationId:
//0x88
//Get sender ACSE-requirements field component.
if (buff.GetUInt8() != 2)
{
throw new Exception("Invalid tag.");
}
if (buff.GetUInt8() != (byte)BerType.ObjectDescriptor)
{
throw new Exception("Invalid tag.");
}
if (buff.GetUInt8() != 0x80)
{
throw new Exception("Invalid tag.");
}
//SenderACSERequirements
if (xml != null)
{
xml.AppendLine(tag, "Value", "1");
}
break;
case (byte)BerType.Context | (byte)PduType.MechanismName://0x8B
case (byte)BerType.Context | (byte)PduType.CallingAeInvocationId://0x89
UpdateAuthentication(settings, buff);
if (xml != null)
{
if (xml.OutputType == TranslatorOutputType.SimpleXml)
{
xml.AppendLine(tag, "Value", settings.Authentication.ToString());
}
else
{
xml.AppendLine(tag, "Value", ((int)settings.Authentication).ToString());
}
}
break;
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.CallingAuthenticationValue://0xAC
updatePassword(settings, buff, xml);
break;
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.UserInformation:
//0xBE
if (xml == null && resultComponent != AssociationResult.Accepted && resultDiagnosticValue != SourceDiagnostic.None)
{
throw new GXDLMSException(resultComponent, resultDiagnosticValue);
}
ParseUserInformation(settings, cipher, buff, xml);
break;
default:
//Unknown tags.
System.Diagnostics.Debug.WriteLine("Unknown tag: " + tag + ".");
if (buff.Position < buff.Size)
{
len = buff.GetUInt8();
buff.Position += (UInt16)len;
}
break;
}
}
//Closing tags
if (xml != null)
{
if (settings.IsServer)
{
xml.AppendEndTag(Command.Aarq);
}
else
{
xml.AppendEndTag(Command.Aare);
}
}
return resultDiagnosticValue;
}
///<summary>
/// Generates Aarq.
///</summary>
static internal void GenerateAarq(GXDLMSSettings settings, GXICipher cipher, GXByteBuffer encryptedData, GXByteBuffer data)
{
//AARQ APDU Tag
data.SetUInt8(BerType.Application | BerType.Constructed);
//Length is updated later.
int offset = data.Size;
data.SetUInt8(0);
///////////////////////////////////////////
// Add Application context name.
GenerateApplicationContextName(settings, data, cipher);
GetAuthenticationString(settings, data);
GenerateUserInformation(settings, cipher, encryptedData, data);
data.SetUInt8(offset, (byte)(data.Size - offset - 1));
}
/// <summary>
/// Generate user information.
/// </summary>
/// <param name="settings">DLMS settings.</param>
/// <param name="cipher"></param>
/// <param name="data">Generated user information.</param>
static internal void GenerateUserInformation(GXDLMSSettings settings, GXICipher cipher, GXByteBuffer encryptedData, GXByteBuffer data)
{
data.SetUInt8((byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.UserInformation);
if (cipher == null || !cipher.IsCiphered())
{
//Length for AARQ user field
data.SetUInt8(0x10);
//Coding the choice for user-information (Octet STRING, universal)
data.SetUInt8(BerType.OctetString);
//Length
data.SetUInt8(0x0E);
GetInitiateRequest(settings, cipher, data);
}
else
{
if (encryptedData != null && encryptedData.Size != 0)
{
//Length for AARQ user field
data.SetUInt8((byte)(4 + encryptedData.Size));
//Tag
data.SetUInt8(BerType.OctetString);
data.SetUInt8((byte)(2 + encryptedData.Size));
//Coding the choice for user-information (Octet STRING, universal)
data.SetUInt8((byte)Command.GloInitiateRequest);
data.SetUInt8((byte)encryptedData.Size);
data.Set(encryptedData);
}
else
{
GXByteBuffer tmp = new GXByteBuffer();
GetInitiateRequest(settings, cipher, tmp);
byte[] crypted = cipher.Encrypt((byte)Command.GloInitiateRequest, cipher.SystemTitle, tmp.Array());
//Length for AARQ user field
data.SetUInt8((byte)(2 + crypted.Length));
//Coding the choice for user-information (Octet STRING, universal)
data.SetUInt8(BerType.OctetString);
data.SetUInt8((byte)crypted.Length);
data.Set(crypted);
}
}
}
/// <summary>
/// Generate User information initiate request.
/// </summary>
/// <param name="settings">DLMS settings.</param>
/// <param name="cipher"></param>
/// <param name="data"></param>
private static void GetInitiateRequest(GXDLMSSettings settings, GXICipher cipher, GXByteBuffer data)
{
// Tag for xDLMS-Initiate request
data.SetUInt8((byte)Command.InitiateRequest);
// Usage field for dedicated-key component. Not used
data.SetUInt8(0x00);
//encoding of the response-allowed component (BOOLEAN DEFAULT TRUE)
// usage flag (FALSE, default value TRUE conveyed)
data.SetUInt8(0);
// Usage field of the proposed-quality-of-service component. Not used
data.SetUInt8(0x00);
data.SetUInt8(settings.DLMSVersion);
// Tag for conformance block
data.SetUInt8(0x5F);
data.SetUInt8(0x1F);
// length of the conformance block
data.SetUInt8(0x04);
// encoding the number of unused bits in the bit string
data.SetUInt8(0x00);
if (settings.UseLogicalNameReferencing)
{
data.Set(settings.LnSettings.ConformanceBlock);
}
else
{
data.Set(settings.SnSettings.ConformanceBlock);
}
data.SetUInt16(settings.MaxPduSize);
}
/// <summary>
/// Parse User Information from PDU.
/// </summary>
private static void ParseUserInformation(GXDLMSSettings settings, GXICipher cipher, GXByteBuffer data)
{
byte len = data.GetUInt8();
if (data.Size - data.Position < len)
{
throw new Exception("Not enough data.");
}
//Excoding the choice for user information
int tag = data.GetUInt8();
if (tag != 0x4)
{
throw new Exception("Invalid tag.");
}
len = data.GetUInt8();
//Tag for xDLMS-Initate.response
tag = data.GetUInt8();
if (tag == GXCommon.InitialResponceGlo)
{
--data.Position;
cipher.Security = cipher.Decrypt(settings.SourceSystemTitle, data);
tag = data.GetUInt8();
}
else if (tag == GXCommon.InitialRequestGlo)
{
--data.Position;
cipher.Security = cipher.Decrypt(settings.SourceSystemTitle, data);
tag = data.GetUInt8();
}
bool response = tag == GXCommon.InitialResponce;
if (response)
{
//Optional usage field of the negotiated quality of service component
tag = data.GetUInt8();
if (tag != 0)//Skip if used.
{
len = data.GetUInt8();
data.Position += len;
}
}
else if (tag == GXCommon.InitialRequest)
{
//Optional usage field of the negotiated quality of service component
tag = data.GetUInt8();
//CtoS.
if (tag != 0)
{
len = data.GetUInt8();
settings.CtoSChallenge = new byte[len];
data.Get(settings.CtoSChallenge);
}
//Optional usage field of the negotiated quality of service component
tag = data.GetUInt8();
if (tag != 0)//Skip if used.
{
len = data.GetUInt8();
data.Position += len;
}
//Optional usage field of the proposed quality of service component
tag = data.GetUInt8();
if (tag != 0)//Skip if used.
{
len = data.GetUInt8();
data.Position += len;
}
}
else
{
throw new Exception("Invalid tag.");
}
//Get DLMS version number.
if (settings.IsServer)
{
settings.DlmsVersionNumber = data.GetUInt8();
}
else
{
if (data.GetUInt8() != 6)
{
throw new Exception("Invalid DLMS version number.");
}
}
//Tag for conformance block
tag = data.GetUInt8();
if (tag != 0x5F)
{
throw new Exception("Invalid tag.");
}
//Old Way...
if (data.GetUInt8(data.Position) == 0x1F)
{
data.GetUInt8();
}
len = data.GetUInt8();
//The number of unused bits in the bit string.
tag = data.GetUInt8();
if (settings.UseLogicalNameReferencing)
{
if (settings.IsServer)
{
//Skip settings what client asks.
//All server settings are always returned.
byte[] tmp = new byte[3];
data.Get(tmp);
}
else
{
data.Get(settings.LnSettings.ConformanceBlock);
}
}
else
{
if (settings.IsServer)
{
//Skip settings what client asks.
//All server settings are always returned.
byte[] tmp = new byte[3];
data.Get(tmp);
}
else
{
data.Get(settings.SnSettings.ConformanceBlock);
}
}
if (settings.IsServer)
{
data.GetUInt16();
}
else
{
settings.MaxReceivePDUSize = data.GetUInt16();
}
if (response)
{
//VAA Name
tag = data.GetUInt16();
if (tag == 0x0007)
{
// If LN
if (!settings.UseLogicalNameReferencing)
{
throw new ArgumentException("Invalid VAA.");
}
}
else if (tag == 0xFA00)
{
// If SN
if (settings.UseLogicalNameReferencing)
{
throw new ArgumentException("Invalid VAA.");
}
}
else
{
// Unknown VAA.
throw new ArgumentException("Invalid VAA.");
}
}
}
///<summary>
/// Chipher text.
///</summary>
///<param name="settings">
///DLMS settings.
///</param>
///<param name="cipher">
///Cipher.
///</param>
///<param name="ic">
///Invocation counter.
///</param>
///<param name="data">
///Text to chipher.
///</param>
///<param name="secret">
///Secret.
///</param>
///<returns>
///Chiphered text.
///</returns>
internal static byte[] Secure(GXDLMSSettings settings, GXICipher cipher, UInt32 ic, byte[] data, byte[] secret)
{
byte[] tmp;
if (settings.Authentication == Authentication.High)
{
int len = secret.Length;
if (len % 16 != 0)
{
len += 16 - (secret.Length % 16);
}
byte[] p = new byte[len];
byte[] s = new byte[16];
byte[] x = new byte[16];
int i;
data.CopyTo(p, 0);
secret.CopyTo(s, 0);
for (i = 0; i < p.Length; i += 16)
{
Buffer.BlockCopy(p, i, x, 0, 16);
GXAes128.Encrypt(x, s);
Buffer.BlockCopy(x, 0, p, i, 16);
}
Buffer.BlockCopy(p, 0, x, 0, 16);
return(x);
}
// Get server Challenge.
GXByteBuffer challenge = new GXByteBuffer();
// Get shared secret
if (settings.Authentication == Authentication.HighGMAC ||
settings.Authentication == Authentication.HighECDSA)
{
challenge.Set(data);
}
else if (settings.Authentication == Authentication.HighSHA256)
{
challenge.Set(secret);
}
else
{
challenge.Set(data);
challenge.Set(secret);
}
tmp = challenge.Array();
if (settings.Authentication == Authentication.HighMD5)
{
#if !WINDOWS_UWP
using (MD5 md5Hash = MD5.Create())
{
tmp = md5Hash.ComputeHash(tmp);
return(tmp);
}
#endif
}
else if (settings.Authentication == Authentication.HighSHA1)
{
#if !WINDOWS_UWP
using (SHA1 sha = new SHA1CryptoServiceProvider())
{
tmp = sha.ComputeHash(tmp);
return(tmp);
}
#endif
}
else if (settings.Authentication == Authentication.HighSHA256)
{
//Windows UWP, IOS ad Android don't support this.
#if !WINDOWS_UWP && !__IOS__ && !__ANDROID__
using (SHA256 sha = new SHA256CryptoServiceProvider())
{
tmp = sha.ComputeHash(tmp);
return(tmp);
}
#endif
}
else if (settings.Authentication == Authentication.HighGMAC)
{
//SC is always Security.Authentication.
AesGcmParameter p = new AesGcmParameter(0, Security.Authentication,
cipher.SecuritySuite,
ic,
secret,
cipher.BlockCipherKey,
cipher.AuthenticationKey);
p.Type = CountType.Tag;
challenge.Clear();
//Security suite is 0.
challenge.SetUInt8((byte)Security.Authentication);
challenge.SetUInt32((UInt32)p.InvocationCounter);
challenge.Set(GXDLMSChippering.EncryptAesGcm(p, tmp));
tmp = challenge.Array();
return(tmp);
}
else if (settings.Authentication == Authentication.HighECDSA)
{
if (cipher.SigningKeyPair.Key == null)
{
throw new ArgumentNullException("SigningKeyPair is not set.");
}
GXEcdsa sig = new GXEcdsa(cipher.SigningKeyPair.Key);
GXByteBuffer bb = new GXByteBuffer();
bb.Set(settings.Cipher.SystemTitle);
bb.Set(settings.SourceSystemTitle);
if (settings.IsServer)
{
bb.Set(settings.CtoSChallenge);
bb.Set(settings.StoCChallenge);
}
else
{
bb.Set(settings.StoCChallenge);
bb.Set(settings.CtoSChallenge);
}
data = sig.Sign(bb.Array());
}
return(data);
}
///<summary>
///Parse APDU.
///</summary>
static internal SourceDiagnostic ParsePDU(GXDLMSSettings settings, GXICipher cipher, GXByteBuffer buff)
{
// Get AARE tag and length
int tag = buff.GetUInt8();
if (settings.IsServer)
{
if (tag != ((byte)BerType.Application | (byte)BerType.Constructed | (byte)PduType.ProtocolVersion))
{
throw new Exception("Invalid tag.");
}
}
else
{
if (tag != ((byte)BerType.Application | (byte)BerType.Constructed | (byte)PduType.ApplicationContextName))
{
throw new Exception("Invalid tag.");
}
}
int len = buff.GetUInt8();
int size = buff.Size - buff.Position;
if (len > size)
{
throw new Exception("Not enough data.");
}
AssociationResult resultComponent = AssociationResult.Accepted;
SourceDiagnostic resultDiagnosticValue = SourceDiagnostic.None;
while (buff.Position < buff.Size)
{
tag = buff.GetUInt8();
switch (tag)
{
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.ApplicationContextName: //0xA1
if (!ParseApplicationContextName(settings, buff))
{
throw new GXDLMSException(AssociationResult.PermanentRejected, SourceDiagnostic.ApplicationContextNameNotSupported);
}
break;
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.CalledApTitle: ////Result 0xA2
//Get len.
if (buff.GetUInt8() != 3)
{
throw new Exception("Invalid tag.");
}
//Choice for result (INTEGER, universal)
if (buff.GetUInt8() != (byte)BerType.Integer)
{
throw new Exception("Invalid tag.");
}
//Get len.
if (buff.GetUInt8() != 1)
{
throw new Exception("Invalid tag.");
}
resultComponent = (AssociationResult)buff.GetUInt8();
break;
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.CalledAeQualifier: ////SourceDiagnostic 0xA3
len = buff.GetUInt8();
// ACSE service user tag.
tag = buff.GetUInt8();
len = buff.GetUInt8();
// Result source diagnostic component.
if (buff.GetUInt8() != (byte)BerType.Integer)
{
throw new Exception("Invalid tag.");
}
if (buff.GetUInt8() != 1)
{
throw new Exception("Invalid tag.");
}
resultDiagnosticValue = (SourceDiagnostic)buff.GetUInt8();
break;
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.CalledApInvocationId: ////Result 0xA4
//Get len.
if (buff.GetUInt8() != 0xA)
{
throw new Exception("Invalid tag.");
}
//Choice for result (Universal, Octetstring type)
if (buff.GetUInt8() != (byte)BerType.OctetString)
{
throw new Exception("Invalid tag.");
}
//responding-AP-title-field
//Get len.
len = buff.GetUInt8();
settings.SourceSystemTitle = new byte[len];
buff.Get(settings.SourceSystemTitle);
break;
//Client Challenge.
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.CallingApTitle: //0xA6
len = buff.GetUInt8();
tag = buff.GetUInt8();
len = buff.GetUInt8();
settings.SourceSystemTitle = new byte[len];
buff.Get(settings.SourceSystemTitle);
break;
//Server Challenge.
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.SenderAcseRequirements: //0xAA
len = buff.GetUInt8();
tag = buff.GetUInt8();
len = buff.GetUInt8();
settings.StoCChallenge = new byte[len];
buff.Get(settings.StoCChallenge);
break;
case (byte)BerType.Context | (byte)PduType.SenderAcseRequirements: //0x8A
case (byte)BerType.Context | (byte)PduType.CallingApInvocationId: //0x88
//Get sender ACSE-requirements field component.
if (buff.GetUInt8() != 2)
{
throw new Exception("Invalid tag.");
}
if (buff.GetUInt8() != (byte)BerType.ObjectDescriptor)
{
throw new Exception("Invalid tag.");
}
if (buff.GetUInt8() != 0x80)
{
throw new Exception("Invalid tag.");
}
break;
case (byte)BerType.Context | (byte)PduType.MechanismName: //0x8B
case (byte)BerType.Context | (byte)PduType.CallingAeInvocationId: //0x89
len = buff.GetUInt8();
if (buff.GetUInt8() != 0x60)
{
throw new Exception("Invalid tag.");
}
if (buff.GetUInt8() != 0x85)
{
throw new Exception("Invalid tag.");
}
if (buff.GetUInt8() != 0x74)
{
throw new Exception("Invalid tag.");
}
if (buff.GetUInt8() != 0x05)
{
throw new Exception("Invalid tag.");
}
if (buff.GetUInt8() != 0x08)
{
throw new Exception("Invalid tag.");
}
if (buff.GetUInt8() != 0x02)
{
throw new Exception("Invalid tag.");
}
int tmp = buff.GetUInt8();
if (tmp < 0 || tmp > 5)
{
throw new Exception("Invalid tag.");
}
settings.Authentication = (Authentication)tmp;
break;
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.CallingAuthenticationValue: //0xAC
len = buff.GetUInt8();
// Get authentication information.
if (buff.GetUInt8() != 0x80)
{
throw new Exception("Invalid tag.");
}
len = buff.GetUInt8();
if (settings.Authentication < Authentication.HighMD5)
{
settings.Password = new byte[len];
buff.Get(settings.Password);
}
else
{
settings.CtoSChallenge = new byte[len];
buff.Get(settings.CtoSChallenge);
}
break;
case (byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.UserInformation: //0xBE
if (resultComponent != AssociationResult.Accepted && resultDiagnosticValue != SourceDiagnostic.None)
{
throw new GXDLMSException(resultComponent, resultDiagnosticValue);
}
ParseUserInformation(settings, cipher, buff);
break;
default:
//Unknown tags.
System.Diagnostics.Debug.WriteLine("Unknown tag: " + tag + ".");
len = buff.GetUInt8();
buff.Position += (UInt16)len;
break;
}
}
return(resultDiagnosticValue);
}
///<summary>
/// Chipher text.
///</summary>
///<param name="settings">
///DLMS settings.
///</param>
///<param name="cipher">
///Cipher.
///</param>
///<param name="ic">
///Invocation counter.
///</param>
///<param name="data">
///Text to chipher.
///</param>
///<param name="secret">
///Secret.
///</param>
///<returns>
///Chiphered text.
///</returns>
public static byte[] Secure(GXDLMSSettings settings, GXICipher cipher, UInt32 ic, byte[] data, byte[] secret)
{
byte[] tmp;
if (settings.Authentication == Authentication.High)
{
int len = secret.Length;
if (len % 16 != 0)
{
len += 16 - (secret.Length % 16);
}
byte[] p = new byte[len];
byte[] s = new byte[16];
byte[] x = new byte[16];
int i;
data.CopyTo(p, 0);
secret.CopyTo(s, 0);
for (i = 0; i < p.Length; i += 16)
{
Buffer.BlockCopy(p, i, x, 0, 16);
GXAes128.Encrypt(x, s);
Buffer.BlockCopy(x, 0, p, i, 16);
}
Buffer.BlockCopy(p, 0, x, 0, 16);
return x;
}
// Get server Challenge.
GXByteBuffer challenge = new GXByteBuffer();
// Get shared secret
if (settings.Authentication == Authentication.HighGMAC)
{
challenge.Set(data);
}
else
{
challenge.Set(data);
challenge.Set(secret);
}
tmp = challenge.Array();
if (settings.Authentication == Authentication.HighMD5)
{
using (MD5 md5Hash = MD5.Create())
{
tmp = md5Hash.ComputeHash(tmp);
return tmp;
}
}
else if (settings.Authentication == Authentication.HighSHA1)
{
using (SHA1 sha = new SHA1CryptoServiceProvider())
{
tmp = sha.ComputeHash(tmp);
return tmp;
}
}
else if (settings.Authentication == Authentication.HighGMAC)
{
//SC is always Security.Authentication.
AesGcmParameter p = new AesGcmParameter(0, Security.Authentication, ic,
secret, cipher.BlockCipherKey, cipher.AuthenticationKey);
p.Type = CountType.Tag;
challenge.Clear();
challenge.SetUInt8((byte)Security.Authentication);
challenge.SetUInt32(p.FrameCounter);
challenge.Set(GXDLMSChippering.EncryptAesGcm(p, tmp));
tmp = challenge.Array();
return tmp;
}
return data;
}
///<summary>
///Server generates AARE message.
///</summary>
internal static void GenerateAARE(GXDLMSSettings settings, GXByteBuffer data,
AssociationResult result, SourceDiagnostic diagnostic, GXICipher cipher)
{
int offset = data.Position;
// Set AARE tag and length
data.SetUInt8(((byte)BerType.Application | (byte)BerType.Constructed | (byte)PduType.ApplicationContextName)); //0x61
// Length is updated later.
data.SetUInt8(0);
GenerateApplicationContextName(settings, data, cipher);
//Result
data.SetUInt8((byte)BerType.Context | (byte)BerType.Constructed | (byte)BerType.Integer); //0xA2
data.SetUInt8(3); //len
data.SetUInt8(BerType.Integer); //Tag
//Choice for result (INTEGER, universal)
data.SetUInt8(1); //Len
data.SetUInt8((byte)result); //ResultValue
//SourceDiagnostic
data.SetUInt8(0xA3);
data.SetUInt8(5); //len
data.SetUInt8(0xA1); //Tag
data.SetUInt8(3); //len
data.SetUInt8(2); //Tag
//Choice for result (INTEGER, universal)
data.SetUInt8(1); //Len
data.SetUInt8((byte)diagnostic); //diagnostic
//SystemTitle
if (cipher != null && (cipher.IsCiphered() || settings.Authentication == Authentication.HighGMAC))
{
data.SetUInt8((byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.CalledApInvocationId);
data.SetUInt8((byte)(2 + cipher.SystemTitle.Length));
data.SetUInt8((byte)BerType.OctetString);
data.SetUInt8((byte)cipher.SystemTitle.Length);
data.Set(cipher.SystemTitle);
}
if (result != AssociationResult.PermanentRejected && diagnostic == SourceDiagnostic.AuthenticationRequired)
{
//Add server ACSE-requirenents field component.
data.SetUInt8(0x88);
data.SetUInt8(0x02); //Len.
data.SetUInt16(0x0780);
//Add tag.
data.SetUInt8(0x89);
data.SetUInt8(0x07);//Len
data.SetUInt8(0x60);
data.SetUInt8(0x85);
data.SetUInt8(0x74);
data.SetUInt8(0x05);
data.SetUInt8(0x08);
data.SetUInt8(0x02);
data.SetUInt8((byte)settings.Authentication);
//Add tag.
data.SetUInt8(0xAA);
data.SetUInt8((byte)(2 + settings.StoCChallenge.Length));//Len
data.SetUInt8((byte)BerType.Context);
data.SetUInt8((byte)settings.StoCChallenge.Length);
data.Set(settings.StoCChallenge);
}
//Add User Information
//Tag 0xBE
data.SetUInt8((byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.UserInformation);
byte[] tmp = GetUserInformation(settings, cipher);
data.SetUInt8((byte)(2 + tmp.Length));
//Coding the choice for user-information (Octet STRING, universal)
data.SetUInt8(BerType.OctetString);
//Length
data.SetUInt8((byte)tmp.Length);
data.Set(tmp);
data.SetUInt8((UInt16)(offset + 1), (byte)(data.Size - offset - 2));
}
///<summary>
///Server generates AARE message.
///</summary>
internal static void GenerateAARE(GXDLMSSettings settings, GXByteBuffer data,
AssociationResult result, SourceDiagnostic diagnostic, GXICipher cipher,
GXByteBuffer encryptedData)
{
int offset = data.Size;
// Set AARE tag and length
data.SetUInt8(((byte)BerType.Application | (byte)BerType.Constructed | (byte)PduType.ApplicationContextName)); //0x61
// Length is updated later.
data.SetUInt8(0);
GenerateApplicationContextName(settings, data, cipher);
//Result
data.SetUInt8((byte)BerType.Context | (byte)BerType.Constructed | (byte)BerType.Integer);//0xA2
data.SetUInt8(3); //len
data.SetUInt8(BerType.Integer); //Tag
//Choice for result (INTEGER, universal)
data.SetUInt8(1); //Len
data.SetUInt8((byte)result); //ResultValue
//SourceDiagnostic
data.SetUInt8(0xA3);
data.SetUInt8(5); //len
data.SetUInt8(0xA1); //Tag
data.SetUInt8(3); //len
data.SetUInt8(2); //Tag
//Choice for result (INTEGER, universal)
data.SetUInt8(1); //Len
data.SetUInt8((byte)diagnostic); //diagnostic
//SystemTitle
if (cipher != null && (cipher.IsCiphered() || settings.Authentication == Authentication.HighGMAC))
{
data.SetUInt8((byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.CalledApInvocationId);
data.SetUInt8((byte)(2 + cipher.SystemTitle.Length));
data.SetUInt8((byte)BerType.OctetString);
data.SetUInt8((byte)cipher.SystemTitle.Length);
data.Set(cipher.SystemTitle);
}
if (result != AssociationResult.PermanentRejected && diagnostic == SourceDiagnostic.AuthenticationRequired)
{
//Add server ACSE-requirenents field component.
data.SetUInt8(0x88);
data.SetUInt8(0x02); //Len.
data.SetUInt16(0x0780);
//Add tag.
data.SetUInt8(0x89);
data.SetUInt8(0x07);//Len
data.SetUInt8(0x60);
data.SetUInt8(0x85);
data.SetUInt8(0x74);
data.SetUInt8(0x05);
data.SetUInt8(0x08);
data.SetUInt8(0x02);
data.SetUInt8((byte)settings.Authentication);
//Add tag.
data.SetUInt8(0xAA);
data.SetUInt8((byte)(2 + settings.StoCChallenge.Length));//Len
data.SetUInt8((byte)BerType.Context);
data.SetUInt8((byte)settings.StoCChallenge.Length);
data.Set(settings.StoCChallenge);
}
byte[] tmp;
//Add User Information
//Tag 0xBE
data.SetUInt8((byte)BerType.Context | (byte)BerType.Constructed | (byte)PduType.UserInformation);
if (encryptedData != null && encryptedData.Size != 0)
{
GXByteBuffer tmp2 = new GXByteBuffer((UInt16)(2 + encryptedData.Size));
tmp2.SetUInt8((byte)Command.GloInitiateResponse);
GXCommon.SetObjectCount(encryptedData.Size, tmp2);
tmp2.Set(encryptedData);
tmp = tmp2.Array();
}
else
{
tmp = GetUserInformation(settings, cipher);
}
data.SetUInt8((byte)(2 + tmp.Length));
//Coding the choice for user-information (Octet STRING, universal)
data.SetUInt8(BerType.OctetString);
//Length
data.SetUInt8((byte)tmp.Length);
data.Set(tmp);
data.SetUInt8((UInt16)(offset + 1), (byte)(data.Size - offset - 2));
}
