protected override byte[] GetClientHello()
{
if (m_State != HandshakeType.Nothing && m_State != HandshakeType.Finished)
{
throw new SslException(AlertDescription.UnexpectedMessage, "ClientHello message must be the first message or must be preceded by a Finished message.");
}
m_IsNegotiating = true;
m_State = HandshakeType.ClientHello;
byte[] ciphers = CipherSuites.GetCipherAlgorithmBytes(m_Options.AllowedAlgorithms);
byte[] compr = CompressionAlgorithm.GetCompressionAlgorithmBytes(m_Options.AllowedAlgorithms);
HandshakeMessage temp = new HandshakeMessage(HandshakeType.ClientHello, new byte[38 + ciphers.Length + compr.Length]);
m_ClientTime = GetUnixTime();
m_ClientRandom = new byte[28];
m_RNG.GetBytes(m_ClientRandom);
ProtocolVersion pv = CompatibilityLayer.GetMaxProtocol(m_Options.Protocol);
temp.fragment[0] = pv.major;
temp.fragment[1] = pv.minor;
Array.Copy(m_ClientTime, 0, temp.fragment, 2, 4);
Array.Copy(m_ClientRandom, 0, temp.fragment, 6, 28);
temp.fragment[34] = 0; // do not resume a session, and do not let the other side cache it
temp.fragment[35] = (byte)(ciphers.Length / 256);
temp.fragment[36] = (byte)(ciphers.Length % 256);
Array.Copy(ciphers, 0, temp.fragment, 37, ciphers.Length);
temp.fragment[37 + ciphers.Length] = (byte)compr.Length;
Array.Copy(compr, 0, temp.fragment, 38 + ciphers.Length, compr.Length);
byte[] ret = temp.ToBytes();
UpdateHashes(ret, HashUpdate.All); // client hello message
return(m_RecordLayer.EncryptBytes(ret, 0, ret.Length, ContentType.Handshake));
}
protected override byte[] GetClientHello()
{
if (m_State != HandshakeType.Nothing && m_State != HandshakeType.Finished)
{
throw new SslException(AlertDescription.UnexpectedMessage, "ClientHello message must be the first message or must be preceded by a Finished message.");
}
m_IsNegotiating = true;
m_State = HandshakeType.ClientHello;
byte[] ciphers = CipherSuites.GetCipherAlgorithmBytes(m_Options.AllowedAlgorithms);
byte[] compr = CompressionAlgorithm.GetCompressionAlgorithmBytes(m_Options.AllowedAlgorithms);
MemoryStream clientHello = new MemoryStream();
m_ClientTime = GetUnixTime();
m_ClientRandom = new byte[28];
m_RNG.GetBytes(m_ClientRandom);
ProtocolVersion pv = CompatibilityLayer.GetMaxProtocol(m_Options.Protocol);
clientHello.WriteByte(pv.major);
clientHello.WriteByte(pv.minor);
clientHello.Write(m_ClientTime, 0, m_ClientTime.Length);
clientHello.Write(m_ClientRandom, 0, m_ClientRandom.Length);
clientHello.WriteByte(0);
clientHello.WriteByte((byte)(ciphers.Length / 256));
clientHello.WriteByte((byte)(ciphers.Length % 256));
clientHello.Write(ciphers, 0, ciphers.Length);
clientHello.WriteByte((byte)compr.Length);
clientHello.Write(compr, 0, compr.Length);
if (this.clientHelloExts != null)
{
this.clientHelloExts.WriteExtensions(clientHello, ConnectionEnd.Client);
}
HandshakeMessage hm = new HandshakeMessage(HandshakeType.ClientHello, clientHello.ToArray());
byte[] ret = hm.ToBytes();
UpdateHashes(ret, HashUpdate.All); // client hello message
return(m_RecordLayer.EncryptBytes(ret, 0, ret.Length, ContentType.Handshake));
}
protected SslHandshakeStatus ProcessServerHelloDone(HandshakeMessage message)
{
if (m_State != HandshakeType.Certificate && m_State != HandshakeType.ServerKeyExchange && m_State != HandshakeType.CertificateRequest)
{
throw new SslException(AlertDescription.UnexpectedMessage, "ServerHello message must be preceded by a ClientHello message.");
}
if (message.fragment.Length != 0)
{
throw new SslException(AlertDescription.IllegalParameter, "The ServerHelloDone message is invalid.");
}
UpdateHashes(message, HashUpdate.All); // input message
MemoryStream ms = new MemoryStream();
HandshakeMessage hm = new HandshakeMessage(HandshakeType.ClientKeyExchange, null);
byte[] buffer;
// send Certificate [optional]
if (m_MutualAuthentication)
{
hm.type = HandshakeType.Certificate;
hm.fragment = GetCertificateBytes(m_Options.Certificate);
buffer = m_RecordLayer.EncryptBytes(hm.ToBytes(), 0, hm.fragment.Length + 4, ContentType.Handshake);
ms.Write(buffer, 0, buffer.Length);
UpdateHashes(hm, HashUpdate.All); // output message
}
// send ClientKeyExchange
if (m_KeyCipher == null)
{
m_KeyCipher = (RSACryptoServiceProvider)m_RemoteCertificate.PublicKey;
}
RSAKeyTransform kf = new RSAKeyTransform(m_KeyCipher);
byte[] preMasterSecret = new byte[48];
m_RNG.GetBytes(preMasterSecret);
ProtocolVersion pv = CompatibilityLayer.GetMaxProtocol(m_Options.Protocol);
preMasterSecret[0] = pv.major;
preMasterSecret[1] = pv.minor;
buffer = kf.CreateKeyExchange(preMasterSecret); // public-key-encrypt the preMasterSecret
hm.type = HandshakeType.ClientKeyExchange;
if (GetProtocol() == SecureProtocol.Ssl3) // SSL
{
hm.fragment = buffer;
}
else // TLS
{
hm.fragment = new byte[buffer.Length + 2];
Buffer.BlockCopy(buffer, 0, hm.fragment, 2, buffer.Length);
hm.fragment[0] = (byte)(buffer.Length / 256); // prepend the length of the preMasterSecret
hm.fragment[1] = (byte)(buffer.Length % 256);
}
GenerateCiphers(preMasterSecret); // generate the local ciphers
buffer = m_RecordLayer.EncryptBytes(hm.ToBytes(), 0, hm.fragment.Length + 4, ContentType.Handshake);
ms.Write(buffer, 0, buffer.Length);
UpdateHashes(hm, HashUpdate.All); // output message
m_KeyCipher.Clear();
m_KeyCipher = null;
// send CertificateVerify [optional]
if (m_MutualAuthentication && m_Options.Certificate != null)
{
m_CertSignHash.MasterKey = this.m_MasterSecret;
m_CertSignHash.TransformFinalBlock(buffer, 0, 0); // finalize hash
buffer = m_CertSignHash.CreateSignature(m_Options.Certificate);
hm.type = HandshakeType.CertificateVerify;
hm.fragment = new byte[buffer.Length + 2];
hm.fragment[0] = (byte)(buffer.Length / 256);
hm.fragment[1] = (byte)(buffer.Length % 256);
Buffer.BlockCopy(buffer, 0, hm.fragment, 2, buffer.Length);
buffer = m_RecordLayer.EncryptBytes(hm.ToBytes(), 0, hm.fragment.Length + 4, ContentType.Handshake);
ms.Write(buffer, 0, buffer.Length);
UpdateHashes(hm, HashUpdate.LocalRemote); // output message
}
// send ChangeCipherSpec
buffer = m_RecordLayer.EncryptBytes(new byte[] { 1 }, 0, 1, ContentType.ChangeCipherSpec);
ms.Write(buffer, 0, buffer.Length);
m_RecordLayer.ChangeLocalState(null, m_CipherSuite.Encryptor, m_CipherSuite.LocalHasher);
//ExtAnswers
if (this.serverHelloExts != null)
{
foreach (var extension in this.serverHelloExts)
{
var responseMessage = extension.GetExtensionResponseMessage();
if (responseMessage != null)
{
buffer = m_RecordLayer.EncryptBytes(responseMessage.ToBytes(), 0, responseMessage.fragment.Length + 4, ContentType.Handshake);
ms.Write(buffer, 0, buffer.Length);
UpdateHashes(responseMessage, HashUpdate.LocalRemote); // output message
}
}
}
// send Finished
buffer = GetFinishedMessage();
UpdateHashes(buffer, HashUpdate.Remote); // output message
buffer = m_RecordLayer.EncryptBytes(buffer, 0, buffer.Length, ContentType.Handshake);
ms.Write(buffer, 0, buffer.Length);
// send empty record [http://www.openssl.org/~bodo/tls-cbc.txt]
if (this.m_CipherSuite.Encryptor.OutputBlockSize != 1) // is bulk cipher?
{
if (((int)m_Options.Flags & (int)SecurityFlags.DontSendEmptyRecord) == 0)
{
byte[] empty = m_RecordLayer.EncryptBytes(new byte[0], 0, 0, ContentType.ApplicationData);
ms.Write(empty, 0, empty.Length);
}
}
// finalize
buffer = ms.ToArray();
ms.Close();
return(new SslHandshakeStatus(SslStatus.ContinueNeeded, buffer));
}