protected static string ReadHints(byte[] buffer, ref int offset, out byte[] hintAddress)
{
string hintName = null;
hintAddress = null;
int constructionLength = DerEncodingHelper.ReadLength(buffer, ref offset);
byte tag = ByteReader.ReadByte(buffer, ref offset);
if (tag != (byte)DerEncodingTag.Sequence)
{
throw new InvalidDataException();
}
int sequenceLength = DerEncodingHelper.ReadLength(buffer, ref offset);
int sequenceEndOffset = offset + sequenceLength;
while (offset < sequenceEndOffset)
{
tag = ByteReader.ReadByte(buffer, ref offset);
if (tag == HintNameTag)
{
hintName = ReadHintName(buffer, ref offset);
}
else if (tag == HintAddressTag)
{
hintAddress = ReadHintAddress(buffer, ref offset);
}
else
{
throw new InvalidDataException();
}
}
return(hintName);
}
public override byte[] GetBytes()
{
int sequenceLength = GetTokenFieldsLength();
int sequenceLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(sequenceLength);
int constructionLength = 1 + sequenceLengthFieldSize + sequenceLength;
int constructionLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(constructionLength);
int bufferSize = 1 + constructionLengthFieldSize + 1 + sequenceLengthFieldSize + sequenceLength;
byte[] buffer = new byte[bufferSize];
int offset = 0;
ByteWriter.WriteByte(buffer, ref offset, NegTokenInitTag);
DerEncodingHelper.WriteLength(buffer, ref offset, constructionLength);
ByteWriter.WriteByte(buffer, ref offset, (byte)DerEncodingTag.Sequence);
DerEncodingHelper.WriteLength(buffer, ref offset, sequenceLength);
if (MechanismTypeList != null)
{
WriteMechanismTypeList(buffer, ref offset, MechanismTypeList);
}
if (MechanismToken != null)
{
WriteMechanismToken(buffer, ref offset, MechanismToken);
}
if (MechanismListMIC != null)
{
WriteMechanismListMIC(buffer, ref offset, MechanismListMIC);
}
return(buffer);
}
/// <summary>
/// https://tools.ietf.org/html/rfc2743
/// </summary>
public static SimpleProtectedNegotiationToken ReadToken(byte[] tokenBytes, int offset)
{
byte tag = ByteReader.ReadByte(tokenBytes, ref offset);
if (tag == ApplicationTag)
{
// when an InitToken is sent, it is prepended by an Application Constructed Object specifier (0x60),
// and the OID for SPNEGO (see value in OID table above). This is the generic GSSAPI header.
int tokenLength = DerEncodingHelper.ReadLength(tokenBytes, ref offset);
tag = ByteReader.ReadByte(tokenBytes, ref offset);
if (tag == (byte)DerEncodingTag.ObjectIdentifier)
{
int objectIdentifierLength = DerEncodingHelper.ReadLength(tokenBytes, ref offset);
byte[] objectIdentifier = ByteReader.ReadBytes(tokenBytes, ref offset, objectIdentifierLength);
if (ByteUtils.AreByteArraysEqual(objectIdentifier, SPNEGOIdentifier))
{
tag = ByteReader.ReadByte(tokenBytes, ref offset);
if (tag == SimpleProtectedNegotiationTokenInit.NegTokenInitTag)
{
return(new SimpleProtectedNegotiationTokenInit(tokenBytes, offset));
}
}
}
}
else if (tag == SimpleProtectedNegotiationTokenResponse.NegTokenRespTag)
{
return(new SimpleProtectedNegotiationTokenResponse(tokenBytes, offset));
}
return(null);
}
public override byte[] GetBytes()
{
int sequenceLength = GetTokenFieldsLength();
int sequenceLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(sequenceLength);
int constructionLength = 1 + sequenceLengthFieldSize + sequenceLength;
int constructionLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(constructionLength);
int bufferSize = 1 + constructionLengthFieldSize + 1 + sequenceLengthFieldSize + sequenceLength;
byte[] buffer = new byte[bufferSize];
int offset = 0;
ByteWriter.WriteByte(buffer, ref offset, NegTokenRespTag);
DerEncodingHelper.WriteLength(buffer, ref offset, constructionLength);
ByteWriter.WriteByte(buffer, ref offset, (byte)DerEncodingTag.Sequence);
DerEncodingHelper.WriteLength(buffer, ref offset, sequenceLength);
if (NegState.HasValue)
{
WriteNegState(buffer, ref offset, NegState.Value);
}
if (SupportedMechanism != null)
{
WriteSupportedMechanism(buffer, ref offset, SupportedMechanism);
}
if (ResponseToken != null)
{
WriteResponseToken(buffer, ref offset, ResponseToken);
}
if (MechanismListMIC != null)
{
WriteMechanismListMIC(buffer, ref offset, MechanismListMIC);
}
return(buffer);
}
protected virtual int GetTokenFieldsLength()
{
int result = 0;
if (MechanismTypeList != null)
{
int typeListSequenceLength = GetMechanismTypeListSequenceLength(MechanismTypeList);
int typeListSequenceLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(typeListSequenceLength);
int typeListConstructionLength = 1 + typeListSequenceLengthFieldSize + typeListSequenceLength;
int typeListConstructionLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(typeListConstructionLength);
int entryLength = 1 + typeListConstructionLengthFieldSize + 1 + typeListSequenceLengthFieldSize + typeListSequenceLength;
result += entryLength;
}
if (MechanismToken != null)
{
int mechanismTokenLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(MechanismToken.Length);
int mechanismTokenConstructionLength = 1 + mechanismTokenLengthFieldSize + MechanismToken.Length;
int mechanismTokenConstructionLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(mechanismTokenConstructionLength);
int entryLength = 1 + mechanismTokenConstructionLengthFieldSize + 1 + mechanismTokenLengthFieldSize + MechanismToken.Length;;
result += entryLength;
}
if (MechanismListMIC != null)
{
int mechanismListMICLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(MechanismListMIC.Length);
int mechanismListMICConstructionLength = 1 + mechanismListMICLengthFieldSize + MechanismListMIC.Length;
int mechanismListMICConstructionLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(mechanismListMICConstructionLength);
int entryLength = 1 + mechanismListMICConstructionLengthFieldSize + 1 + mechanismListMICLengthFieldSize + MechanismListMIC.Length;
result += entryLength;
}
return(result);
}
private static List <byte[]> ReadMechanismTypeList(byte[] buffer, ref int offset)
{
List <byte[]> result = new List <byte[]>();
int constructionLength = DerEncodingHelper.ReadLength(buffer, ref offset);
byte tag = ByteReader.ReadByte(buffer, ref offset);
if (tag != (byte)DerEncodingTag.Sequence)
{
throw new InvalidDataException();
}
int sequenceLength = DerEncodingHelper.ReadLength(buffer, ref offset);
int sequenceEndOffset = offset + sequenceLength;
while (offset < sequenceEndOffset)
{
tag = ByteReader.ReadByte(buffer, ref offset);
if (tag != (byte)DerEncodingTag.ObjectIdentifier)
{
throw new InvalidDataException();
}
int mechanismTypeLength = DerEncodingHelper.ReadLength(buffer, ref offset);
byte[] mechanismType = ByteReader.ReadBytes(buffer, ref offset, mechanismTypeLength);
result.Add(mechanismType);
}
return(result);
}
private int GetTokenFieldsLength()
{
int result = 0;
if (NegState.HasValue)
{
int negStateLength = 5;
result += negStateLength;
}
if (SupportedMechanism != null)
{
int supportedMechanismBytesLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(SupportedMechanism.Length);
int supportedMechanismConstructionLength = 1 + supportedMechanismBytesLengthFieldSize + SupportedMechanism.Length;
int supportedMechanismConstructionLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(supportedMechanismConstructionLength);
int supportedMechanismLength = 1 + supportedMechanismConstructionLengthFieldSize + 1 + supportedMechanismBytesLengthFieldSize + SupportedMechanism.Length;
result += supportedMechanismLength;
}
if (ResponseToken != null)
{
int responseTokenBytesLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(ResponseToken.Length);
int responseTokenConstructionLength = 1 + responseTokenBytesLengthFieldSize + ResponseToken.Length;
int responseTokenConstructionLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(responseTokenConstructionLength);
int responseTokenLength = 1 + responseTokenConstructionLengthFieldSize + 1 + responseTokenBytesLengthFieldSize + ResponseToken.Length;
result += responseTokenLength;
}
return(result);
}
private static void WriteNegState(byte[] buffer, ref int offset, NegState negState)
{
ByteWriter.WriteByte(buffer, ref offset, NegStateTag);
DerEncodingHelper.WriteLength(buffer, ref offset, 3);
ByteWriter.WriteByte(buffer, ref offset, (byte)DerEncodingTag.Enum);
DerEncodingHelper.WriteLength(buffer, ref offset, 1);
ByteWriter.WriteByte(buffer, ref offset, (byte)negState);
}
private static void WriteHintAddress(byte[] buffer, ref int offset, byte[] hintAddress)
{
int constructionLength = 1 + DerEncodingHelper.GetLengthFieldSize(hintAddress.Length) + hintAddress.Length;
ByteWriter.WriteByte(buffer, ref offset, HintAddressTag);
DerEncodingHelper.WriteLength(buffer, ref offset, constructionLength);
ByteWriter.WriteByte(buffer, ref offset, (byte)DerEncodingTag.ByteArray);
DerEncodingHelper.WriteLength(buffer, ref offset, hintAddress.Length);
ByteWriter.WriteBytes(buffer, ref offset, hintAddress);
}
private static void WriteResponseToken(byte[] buffer, ref int offset, byte[] responseToken)
{
int responseTokenLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(responseToken.Length);
ByteWriter.WriteByte(buffer, ref offset, ResponseTokenTag);
DerEncodingHelper.WriteLength(buffer, ref offset, 1 + responseTokenLengthFieldSize + responseToken.Length);
ByteWriter.WriteByte(buffer, ref offset, (byte)DerEncodingTag.ByteArray);
DerEncodingHelper.WriteLength(buffer, ref offset, responseToken.Length);
ByteWriter.WriteBytes(buffer, ref offset, responseToken);
}
private static void WriteSupportedMechanism(byte[] buffer, ref int offset, byte[] supportedMechanism)
{
int supportedMechanismLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(supportedMechanism.Length);
ByteWriter.WriteByte(buffer, ref offset, SupportedMechanismTag);
DerEncodingHelper.WriteLength(buffer, ref offset, 1 + supportedMechanismLengthFieldSize + supportedMechanism.Length);
ByteWriter.WriteByte(buffer, ref offset, (byte)DerEncodingTag.ObjectIdentifier);
DerEncodingHelper.WriteLength(buffer, ref offset, supportedMechanism.Length);
ByteWriter.WriteBytes(buffer, ref offset, supportedMechanism);
}
private static void WriteMechanismToken(byte[] buffer, ref int offset, byte[] mechanismToken)
{
int constructionLength = 1 + DerEncodingHelper.GetLengthFieldSize(mechanismToken.Length) + mechanismToken.Length;
ByteWriter.WriteByte(buffer, ref offset, MechanismTokenTag);
DerEncodingHelper.WriteLength(buffer, ref offset, constructionLength);
ByteWriter.WriteByte(buffer, ref offset, (byte)DerEncodingTag.ByteArray);
DerEncodingHelper.WriteLength(buffer, ref offset, mechanismToken.Length);
ByteWriter.WriteBytes(buffer, ref offset, mechanismToken);
}
private static void WriteMechanismListMIC(byte[] buffer, ref int offset, byte[] mechanismListMIC)
{
int mechanismListMICLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(mechanismListMIC.Length);
ByteWriter.WriteByte(buffer, ref offset, MechanismListMICTag);
DerEncodingHelper.WriteLength(buffer, ref offset, 1 + mechanismListMICLengthFieldSize + mechanismListMIC.Length);
ByteWriter.WriteByte(buffer, ref offset, (byte)DerEncodingTag.ByteArray);
DerEncodingHelper.WriteLength(buffer, ref offset, mechanismListMIC.Length);
ByteWriter.WriteBytes(buffer, ref offset, mechanismListMIC);
}
private static void WriteHintName(byte[] buffer, ref int offset, string hintName)
{
byte[] hintNameBytes = DerEncodingHelper.EncodeGeneralString(hintName);
int constructionLength = 1 + DerEncodingHelper.GetLengthFieldSize(hintNameBytes.Length) + hintNameBytes.Length;
ByteWriter.WriteByte(buffer, ref offset, HintNameTag);
DerEncodingHelper.WriteLength(buffer, ref offset, constructionLength);
ByteWriter.WriteByte(buffer, ref offset, (byte)DerEncodingTag.GeneralString);
DerEncodingHelper.WriteLength(buffer, ref offset, hintNameBytes.Length);
ByteWriter.WriteBytes(buffer, ref offset, hintNameBytes);
}
private static int GetSequenceLength(List <byte[]> mechanismTypeList)
{
int sequenceLength = 0;
foreach (byte[] mechanismType in mechanismTypeList)
{
int lengthFieldSize = DerEncodingHelper.GetLengthFieldSize(mechanismType.Length);
int entryLength = 1 + lengthFieldSize + mechanismType.Length;
sequenceLength += entryLength;
}
return(sequenceLength);
}
private static NegState ReadNegState(byte[] buffer, ref int offset)
{
int length = DerEncodingHelper.ReadLength(buffer, ref offset);
byte tag = ByteReader.ReadByte(buffer, ref offset);
if (tag != (byte)DerEncodingTag.Enum)
{
throw new InvalidDataException();
}
length = DerEncodingHelper.ReadLength(buffer, ref offset);
return((NegState)ByteReader.ReadByte(buffer, ref offset));
}
private static byte[] ReadMechanismListMIC(byte[] buffer, ref int offset)
{
int constructionLength = DerEncodingHelper.ReadLength(buffer, ref offset);
byte tag = ByteReader.ReadByte(buffer, ref offset);
if (tag != (byte)DerEncodingTag.ByteArray)
{
throw new InvalidDataException();
}
int length = DerEncodingHelper.ReadLength(buffer, ref offset);
return(ByteReader.ReadBytes(buffer, ref offset, length));
}
protected static byte[] ReadHintAddress(byte[] buffer, ref int offset)
{
int constructionLength = DerEncodingHelper.ReadLength(buffer, ref offset);
byte tag = ByteReader.ReadByte(buffer, ref offset);
if (tag != (byte)DerEncodingTag.ByteArray)
{
throw new InvalidDataException();
}
int hintLength = DerEncodingHelper.ReadLength(buffer, ref offset);
return(ByteReader.ReadBytes(buffer, ref offset, hintLength));
}
private static byte[] ReadSupportedMechanism(byte[] buffer, ref int offset)
{
int constructionLength = DerEncodingHelper.ReadLength(buffer, ref offset);
byte tag = ByteReader.ReadByte(buffer, ref offset);
if (tag != (byte)DerEncodingTag.ObjectIdentifier)
{
throw new InvalidDataException();
}
int length = DerEncodingHelper.ReadLength(buffer, ref offset);
return(ByteReader.ReadBytes(buffer, ref offset, length));
}
protected static byte[] ReadMechanismToken(byte[] buffer, ref int offset)
{
int constructionLength = DerEncodingHelper.ReadLength(buffer, ref offset);
byte tag = ByteReader.ReadByte(buffer, ref offset);
if (tag != (byte)DerEncodingTag.ByteArray)
{
throw new InvalidDataException();
}
int mechanismTokenLength = DerEncodingHelper.ReadLength(buffer, ref offset);
byte[] token = ByteReader.ReadBytes(buffer, ref offset, mechanismTokenLength);
return(token);
}
protected static string ReadHintName(byte[] buffer, ref int offset)
{
int constructionLength = DerEncodingHelper.ReadLength(buffer, ref offset);
byte tag = ByteReader.ReadByte(buffer, ref offset);
if (tag != (byte)DerEncodingTag.GeneralString)
{
throw new InvalidDataException();
}
int hintLength = DerEncodingHelper.ReadLength(buffer, ref offset);
byte[] hintNameBytes = ByteReader.ReadBytes(buffer, ref offset, hintLength);
return(DerEncodingHelper.DecodeGeneralString(hintNameBytes));
}
protected override int GetTokenFieldsLength()
{
int result = base.GetTokenFieldsLength();;
if (HintName != null || HintAddress != null)
{
int hintsSequenceLength = GetHintsSequenceLength(HintName, HintAddress);
int hintsSequenceLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(hintsSequenceLength);
int hintsSequenceConstructionLength = 1 + hintsSequenceLengthFieldSize + hintsSequenceLength;
int hintsSequenceConstructionLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(hintsSequenceConstructionLength);
int entryLength = 1 + hintsSequenceConstructionLengthFieldSize + 1 + hintsSequenceLengthFieldSize + hintsSequenceLength;
result += entryLength;
}
return(result);
}
/// <summary>
/// https://tools.ietf.org/html/rfc2743
/// </summary>
/// <exception cref="System.IO.InvalidDataException"></exception>
public static SimpleProtectedNegotiationToken ReadToken(byte[] tokenBytes, int offset, bool serverInitiatedNegotiation)
{
byte tag = ByteReader.ReadByte(tokenBytes, ref offset);
if (tag == ApplicationTag)
{
// https://msdn.microsoft.com/en-us/library/ms995330.aspx
// when an InitToken is sent, it is prepended by an Application Constructed Object specifier (0x60),
// and the OID for SPNEGO. This is the generic GSSAPI header.
// [RFC 2743] The use of the Mechanism-Independent Token Format is required for initial context
// establishment tokens, use in non-initial tokens is optional.
int tokenLength = DerEncodingHelper.ReadLength(tokenBytes, ref offset);
tag = ByteReader.ReadByte(tokenBytes, ref offset);
if (tag == (byte)DerEncodingTag.ObjectIdentifier)
{
int objectIdentifierLength = DerEncodingHelper.ReadLength(tokenBytes, ref offset);
byte[] objectIdentifier = ByteReader.ReadBytes(tokenBytes, ref offset, objectIdentifierLength);
if (ByteUtils.AreByteArraysEqual(objectIdentifier, SPNEGOIdentifier))
{
tag = ByteReader.ReadByte(tokenBytes, ref offset);
if (tag == SimpleProtectedNegotiationTokenInit.NegTokenInitTag)
{
if (serverInitiatedNegotiation)
{
// [MS-SPNG] Standard GSS has a strict notion of client (initiator) and server (acceptor).
// If the client has not sent a negTokenInit ([RFC4178] section 4.2.1) message, no context establishment token is expected from the server.
// The [NegTokenInit2] SPNEGO extension allows the server to generate a context establishment token message [..] and send it to the client.
return(new SimpleProtectedNegotiationTokenInit2(tokenBytes, offset));
}
else
{
return(new SimpleProtectedNegotiationTokenInit(tokenBytes, offset));
}
}
else if (tag == SimpleProtectedNegotiationTokenResponse.NegTokenRespTag)
{
return(new SimpleProtectedNegotiationTokenResponse(tokenBytes, offset));
}
}
}
}
else if (tag == SimpleProtectedNegotiationTokenResponse.NegTokenRespTag)
{
return(new SimpleProtectedNegotiationTokenResponse(tokenBytes, offset));
}
return(null);
}
private static void WriteMechanismTypeList(byte[] buffer, ref int offset, List <byte[]> mechanismTypeList)
{
int sequenceLength = GetSequenceLength(mechanismTypeList);
int sequenceLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(sequenceLength);
int constructionLength = 1 + sequenceLengthFieldSize + sequenceLength;
ByteWriter.WriteByte(buffer, ref offset, MechanismTypeListTag);
DerEncodingHelper.WriteLength(buffer, ref offset, constructionLength);
ByteWriter.WriteByte(buffer, ref offset, (byte)DerEncodingTag.Sequence);
DerEncodingHelper.WriteLength(buffer, ref offset, sequenceLength);
foreach (byte[] mechanismType in mechanismTypeList)
{
ByteWriter.WriteByte(buffer, ref offset, (byte)DerEncodingTag.ObjectIdentifier);
DerEncodingHelper.WriteLength(buffer, ref offset, mechanismType.Length);
ByteWriter.WriteBytes(buffer, ref offset, mechanismType);
}
}
private static void WriteHints(byte[] buffer, ref int offset, string hintName, byte[] hintAddress)
{
int sequenceLength = GetHintsSequenceLength(hintName, hintAddress);
int sequenceLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(sequenceLength);
int constructionLength = 1 + sequenceLengthFieldSize + sequenceLength;
ByteWriter.WriteByte(buffer, ref offset, NegHintsTag);
DerEncodingHelper.WriteLength(buffer, ref offset, constructionLength);
ByteWriter.WriteByte(buffer, ref offset, (byte)DerEncodingTag.Sequence);
DerEncodingHelper.WriteLength(buffer, ref offset, sequenceLength);
if (hintName != null)
{
WriteHintName(buffer, ref offset, hintName);
}
if (hintAddress != null)
{
WriteHintAddress(buffer, ref offset, hintAddress);
}
}
/// <param name="offset">The offset following the NegTokenInit2 tag</param>
/// <exception cref="System.IO.InvalidDataException"></exception>
public SimpleProtectedNegotiationTokenInit2(byte[] buffer, int offset)
{
int constructionLength = DerEncodingHelper.ReadLength(buffer, ref offset);
byte tag = ByteReader.ReadByte(buffer, ref offset);
if (tag != (byte)DerEncodingTag.Sequence)
{
throw new InvalidDataException();
}
int sequenceLength = DerEncodingHelper.ReadLength(buffer, ref offset);
int sequenceEndOffset = offset + sequenceLength;
while (offset < sequenceEndOffset)
{
tag = ByteReader.ReadByte(buffer, ref offset);
if (tag == MechanismTypeListTag)
{
MechanismTypeList = ReadMechanismTypeList(buffer, ref offset);
}
else if (tag == RequiredFlagsTag)
{
throw new NotImplementedException("negTokenInit.ReqFlags is not implemented");
}
else if (tag == MechanismTokenTag)
{
MechanismToken = ReadMechanismToken(buffer, ref offset);
}
else if (tag == NegHintsTag)
{
HintName = ReadHints(buffer, ref offset, out HintAddress);
}
else if (tag == MechanismListMICTag)
{
MechanismListMIC = ReadMechanismListMIC(buffer, ref offset);
}
else
{
throw new InvalidDataException("Invalid negTokenInit structure");
}
}
}
/// <summary>
/// https://tools.ietf.org/html/rfc2743
/// </summary>
/// <exception cref="System.IO.InvalidDataException"></exception>
public static SimpleProtectedNegotiationToken ReadToken(byte[] tokenBytes, int offset)
{
byte tag = ByteReader.ReadByte(tokenBytes, ref offset);
if (tag == ApplicationTag)
{
// https://msdn.microsoft.com/en-us/library/ms995330.aspx
// when an InitToken is sent, it is prepended by an Application Constructed Object specifier (0x60),
// and the OID for SPNEGO. This is the generic GSSAPI header.
// [RFC 2743] The use of the Mechanism-Independent Token Format is required for initial context
// establishment tokens, use in non-initial tokens is optional.
int tokenLength = DerEncodingHelper.ReadLength(tokenBytes, ref offset);
tag = ByteReader.ReadByte(tokenBytes, ref offset);
if (tag == (byte)DerEncodingTag.ObjectIdentifier)
{
int objectIdentifierLength = DerEncodingHelper.ReadLength(tokenBytes, ref offset);
byte[] objectIdentifier = ByteReader.ReadBytes(tokenBytes, ref offset, objectIdentifierLength);
if (ByteUtils.AreByteArraysEqual(objectIdentifier, SPNEGOIdentifier))
{
tag = ByteReader.ReadByte(tokenBytes, ref offset);
if (tag == SimpleProtectedNegotiationTokenInit.NegTokenInitTag)
{
return(new SimpleProtectedNegotiationTokenInit(tokenBytes, offset));
}
else if (tag == SimpleProtectedNegotiationTokenResponse.NegTokenRespTag)
{
return(new SimpleProtectedNegotiationTokenResponse(tokenBytes, offset));
}
}
}
}
else if (tag == SimpleProtectedNegotiationTokenResponse.NegTokenRespTag)
{
return(new SimpleProtectedNegotiationTokenResponse(tokenBytes, offset));
}
return(null);
}
protected static int GetHintsSequenceLength(string hintName, byte[] hintAddress)
{
int sequenceLength = 0;
if (hintName != null)
{
byte[] hintNameBytes = DerEncodingHelper.EncodeGeneralString(hintName);
int lengthFieldSize = DerEncodingHelper.GetLengthFieldSize(hintNameBytes.Length);
int constructionLength = 1 + lengthFieldSize + hintNameBytes.Length;
int constructionLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(constructionLength);
int entryLength = 1 + constructionLengthFieldSize + 1 + lengthFieldSize + hintNameBytes.Length;
sequenceLength += entryLength;
}
if (hintAddress != null)
{
int lengthFieldSize = DerEncodingHelper.GetLengthFieldSize(hintAddress.Length);
int constructionLength = 1 + lengthFieldSize + hintAddress.Length;
int constructionLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(constructionLength);
int entryLength = 1 + constructionLengthFieldSize + 1 + lengthFieldSize + hintAddress.Length;
sequenceLength += entryLength;
}
return(sequenceLength);
}
private int GetTokenFieldsLength()
{
int result = 0;
if (MechanismTypeList != null)
{
int typeListSequenceLength = GetSequenceLength(MechanismTypeList);
int typeListSequenceLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(typeListSequenceLength);
int typeListConstructionLength = 1 + typeListSequenceLengthFieldSize + typeListSequenceLength;
int typeListConstructionLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(typeListConstructionLength);
int typeListLength = 1 + typeListConstructionLengthFieldSize + 1 + typeListSequenceLengthFieldSize + typeListSequenceLength;
result += typeListLength;
}
if (MechanismToken != null)
{
int mechanismTokenBytesFieldSize = DerEncodingHelper.GetLengthFieldSize(MechanismToken.Length);
int mechanismTokenConstructionLength = 1 + mechanismTokenBytesFieldSize + MechanismToken.Length;
int mechanismTokenConstructionLengthFieldSize = DerEncodingHelper.GetLengthFieldSize(mechanismTokenConstructionLength);
int tokenLength = 1 + mechanismTokenConstructionLengthFieldSize + 1 + mechanismTokenBytesFieldSize + MechanismToken.Length;
result += tokenLength;
}
return(result);
}
/// <param name="offset">The offset following the NegTokenResp tag</param>
/// <exception cref="System.IO.InvalidDataException"></exception>
public SimpleProtectedNegotiationTokenResponse(byte[] buffer, int offset)
{
int constuctionLength = DerEncodingHelper.ReadLength(buffer, ref offset);
byte tag = ByteReader.ReadByte(buffer, ref offset);
if (tag != (byte)DerEncodingTag.Sequence)
{
throw new InvalidDataException();
}
int sequenceLength = DerEncodingHelper.ReadLength(buffer, ref offset);
int sequenceEndOffset = offset + sequenceLength;
while (offset < sequenceEndOffset)
{
tag = ByteReader.ReadByte(buffer, ref offset);
if (tag == NegStateTag)
{
NegState = ReadNegState(buffer, ref offset);
}
else if (tag == SupportedMechanismTag)
{
SupportedMechanism = ReadSupportedMechanism(buffer, ref offset);
}
else if (tag == ResponseTokenTag)
{
ResponseToken = ReadResponseToken(buffer, ref offset);
}
else if (tag == MechanismListMICTag)
{
MechanismListMIC = ReadMechanismListMIC(buffer, ref offset);
}
else
{
throw new InvalidDataException("Invalid negTokenResp structure");
}
}
}
