public static ClientHello CreateFromSSL2CompatibleData(ProtocolVersion ver, byte[] buffer, int offset, uint length)
{
ClientHello msg = new ClientHello(ver);
int cipherLen = BitConverterBE.ReadUInt16AndMoveOffset(buffer, ref offset) / 3;
ushort sessionIdLen = BitConverterBE.ReadUInt16AndMoveOffset(buffer, ref offset);
if (sessionIdLen != 0 && sessionIdLen != 16)
{
throw new Exception();
}
ushort challengeLen = BitConverterBE.ReadUInt16AndMoveOffset(buffer, ref offset);
if (challengeLen < 16)
{
throw new Exception();
}
if (challengeLen > RandomData.Size)
{
challengeLen = RandomData.Size;
}
msg._cipherSuites = new CipherSuite[cipherLen];
for (int i = 0; i < cipherLen; i++)
{
msg._cipherSuites[i] = (CipherSuite)BitConverterBE.ReadUInt24AndMoveOffset(buffer, ref offset);
}
msg._sessionId = new byte[sessionIdLen];
Buffer.BlockCopy(buffer, offset, msg._sessionId, 0, sessionIdLen);
offset += sessionIdLen;
msg._random = new byte[RandomData.Size];
Buffer.BlockCopy(buffer, offset, msg._random, 0, challengeLen);
return(msg);
}
public void ComputeServerMasterSecret(SecurityParameters sparams, byte[] raw, int offset, int length)
{
ushort len = BitConverterBE.ReadUInt16AndMoveOffset(raw, ref offset);
byte[] premaster = _dh.PerformKeyAgreement(raw, offset, len);
sparams.SetupMasterSecret(premaster);
}
public ClientHello(byte[] buffer, int offset, uint length) : base(HandshakeType.ClientHello)
{
int idx = offset, end = (int)(offset + length);
_version = (ProtocolVersion)BitConverterBE.ReadUInt16AndMoveOffset(buffer, ref idx);
_random = RandomData.ReadRandomData(buffer, idx);
idx += RandomData.Size;
if (buffer[idx] > 32)
{
throw new FormatException();
}
_sessionId = new byte[buffer[idx]];
Buffer.BlockCopy(buffer, idx + 1, _sessionId, 0, _sessionId.Length);
idx += 1 + _sessionId.Length;
_cipherSuites = new CipherSuite[BitConverterBE.ReadUInt16AndMoveOffset(buffer, ref idx) >> 1];
for (int i = 0; i < _cipherSuites.Length; i++)
{
_cipherSuites[i] = (CipherSuite)BitConverterBE.ReadUInt16AndMoveOffset(buffer, ref idx);
}
_compressions = new CompressionMethod[buffer[idx]];
for (int i = 0; i < _compressions.Length; i++)
{
_compressions[i] = (CompressionMethod)buffer[idx + 1 + i];
}
idx += 1 + _compressions.Length;
if (idx < end)
{
int extBytes = BitConverterBE.ReadUInt16AndMoveOffset(buffer, ref idx);
List <Extension> list = new List <Extension> ();
while (idx < end)
{
ExtensionType etype = (ExtensionType)BitConverterBE.ReadUInt16(buffer, idx);
int esize = BitConverterBE.ReadUInt16(buffer, idx + 2);
byte[] edata = new byte[esize];
Buffer.BlockCopy(buffer, idx + 4, edata, 0, esize);
list.Add(new Extension(etype, edata));
idx += 4 + esize;
}
_extensions = list.ToArray();
}
else
{
_extensions = Utility.EmptyExtensionArray;
}
}