private ISigner GetSigner(TSignatureAlgorithm signatureAlgorithm, THashAlgorithm hashAlgorithm, AsymmetricKeyParameter serverPrivateKey)
{
ISigner result = null;
switch (signatureAlgorithm)
{
case TSignatureAlgorithm.Anonymous:
break;
case TSignatureAlgorithm.RSA:
break;
case TSignatureAlgorithm.DSA:
break;
case TSignatureAlgorithm.ECDSA:
result = new DsaDigestSigner(new ECDsaSigner(), GetDigest(hashAlgorithm));
break;
default:
break;
}
result.Init(true, serverPrivateKey);
//result.Init(true, new ParametersWithRandom(serverPrivateKey, this.mContext.SecureRandom));
return(result);
}
public static CertificateRequest Deserialise(Stream stream, Version version)
{
CertificateRequest result = new CertificateRequest();
int certificateTypeCount = stream.ReadByte();
if (certificateTypeCount > 0)
{
for (int index = 0; index < certificateTypeCount; index++)
{
result.CertificateTypes.Add((TClientCertificateType)stream.ReadByte());
}
}
if (version >= DTLSRecord.Version1_2)
{
ushort length = NetworkByteOrderConverter.ToUInt16(stream);
ushort supportedAlgorithmsLength = (ushort)(length / 2);
if (supportedAlgorithmsLength > 0)
{
for (uint index = 0; index < supportedAlgorithmsLength; index++)
{
THashAlgorithm hash = (THashAlgorithm)stream.ReadByte();
TSignatureAlgorithm signature = (TSignatureAlgorithm)stream.ReadByte();
result.SupportedAlgorithms.Add(new SignatureHashAlgorithm()
{
Hash = hash, Signature = signature
});
}
}
}
ushort certificateAuthoritiesLength = NetworkByteOrderConverter.ToUInt16(stream);
if (certificateAuthoritiesLength > 0)
{
int read = 0;
while (certificateAuthoritiesLength > read)
{
ushort distinguishedNameLength = NetworkByteOrderConverter.ToUInt16(stream);
read += (2 + distinguishedNameLength);
byte[] distinguishedName = new byte[distinguishedNameLength];
stream.Read(distinguishedName, 0, distinguishedNameLength);
result.CertificateAuthorities.Add(distinguishedName);
}
}
return(result);
}
public static CertificateVerify Deserialise(Stream stream, Version version)
{
CertificateVerify result = new CertificateVerify();
THashAlgorithm hash = (THashAlgorithm)stream.ReadByte();
TSignatureAlgorithm signature = (TSignatureAlgorithm)stream.ReadByte();
result.SignatureHashAlgorithm = new SignatureHashAlgorithm()
{
Hash = hash, Signature = signature
};
ushort length = NetworkByteOrderConverter.ToUInt16(stream);
if (length > 0)
{
result.Signature = new byte[length];
stream.Read(result.Signature, 0, length);
}
return(result);
}
public ECDHEServerKeyExchange(ECDHEKeyExchange keyExchange, THashAlgorithm hashAlgorithm, TSignatureAlgorithm signatureAlgorithm, AsymmetricKeyParameter serverPrivateKey)
{
_EllipticCurveType = TEllipticCurveType.NamedCurve;
_EllipticCurve = keyExchange.Curve;
_HashAlgorithm = hashAlgorithm;
_SignatureAlgorithm = signatureAlgorithm;
System.IO.MemoryStream stream = new System.IO.MemoryStream();
stream.WriteByte((byte)_EllipticCurveType);
NetworkByteOrderConverter.WriteUInt16(stream, (ushort)_EllipticCurve);
byte[] pointEncoded = keyExchange.PublicKey.Q.GetEncoded(false);
stream.WriteByte((byte)pointEncoded.Length);
stream.Write(pointEncoded, 0, pointEncoded.Length);
_ServerParams = stream.ToArray();
//IDigest hashMD5 = GetDigest(THashAlgorithm.MD5);
//IDigest hashSHA = GetDigest(THashAlgorithm.SHA1);
//int size = hashMD5.GetDigestSize();
//byte[] hash = new byte[size + hashSHA.GetDigestSize()];
//hashMD5.BlockUpdate(clientRandom.RandomBytes, 0, clientRandom.RandomBytes.Length);
//hashMD5.BlockUpdate(serverRandom.RandomBytes, 0, serverRandom.RandomBytes.Length);
//hashMD5.BlockUpdate(_ServerParams, 0, _ServerParams.Length);
//hashMD5.DoFinal(hash, 0);
//hashSHA.BlockUpdate(clientRandom.RandomBytes, 0, clientRandom.RandomBytes.Length);
//hashSHA.BlockUpdate(serverRandom.RandomBytes, 0, serverRandom.RandomBytes.Length);
//hashSHA.BlockUpdate(_ServerParams, 0, _ServerParams.Length);
//hashSHA.DoFinal(hash, size);
//ISigner signer = GetSigner(signatureAlgorithm, THashAlgorithm.None, serverPrivateKey);
//signer.BlockUpdate(hash, 0, hash.Length);
//_Signature = signer.GenerateSignature();
ISigner signer = GetSigner(signatureAlgorithm, hashAlgorithm, serverPrivateKey);
byte[] clientRandomBytes = keyExchange.ClientRandom.Serialise();
byte[] serverRandomBytes = keyExchange.ServerRandom.Serialise();
signer.BlockUpdate(clientRandomBytes, 0, clientRandomBytes.Length);
signer.BlockUpdate(serverRandomBytes, 0, serverRandomBytes.Length);
signer.BlockUpdate(_ServerParams, 0, _ServerParams.Length);
_Signature = signer.GenerateSignature();
}
public static SignatureAlgorithmsExtension Deserialise(Stream stream)
{
SignatureAlgorithmsExtension result = new SignatureAlgorithmsExtension();
ushort length = NetworkByteOrderConverter.ToUInt16(stream);
ushort supportedAlgorithmsLength = (ushort)(length / 2);
if (supportedAlgorithmsLength > 0)
{
for (uint index = 0; index < supportedAlgorithmsLength; index++)
{
THashAlgorithm hash = (THashAlgorithm)stream.ReadByte();
TSignatureAlgorithm signature = (TSignatureAlgorithm)stream.ReadByte();
result.SupportedAlgorithms.Add(new SignatureHashAlgorithm()
{
Hash = hash, Signature = signature
});
}
}
return(result);
}
private IDigest GetDigest(THashAlgorithm hashAlgorithm)
{
IDigest result = null;
switch (hashAlgorithm)
{
case THashAlgorithm.None:
result = new NullDigest();
break;
case THashAlgorithm.MD5:
result = new MD5Digest();
break;
case THashAlgorithm.SHA1:
result = new Sha1Digest();
break;
case THashAlgorithm.SHA224:
result = new Sha224Digest();
break;
case THashAlgorithm.SHA256:
result = new Sha256Digest();
break;
case THashAlgorithm.SHA384:
result = new Sha384Digest();
break;
case THashAlgorithm.SHA512:
result = new Sha512Digest();
break;
default:
break;
}
return(result);
}
public void ProcessHandshake(DTLSRecord record)
{
#if DEBUG
Console.WriteLine($"> ProcessHandshake got {record}");
#endif
SocketAddress address = record.RemoteEndPoint.Serialize();
Session session = Sessions.GetSession(address);
byte[] data;
if ((session != null) && session.IsEncypted(record))
{
int count = 0;
while ((session.Cipher == null) && (count < (HandshakeTimeout / HANDSHAKE_DWELL_TIME)))
{
System.Threading.Thread.Sleep(HANDSHAKE_DWELL_TIME);
count++;
}
if (session.Cipher == null)
{
throw new Exception($"HandshakeTimeout: >{HandshakeTimeout}");
}
if (session.Cipher != null)
{
long sequenceNumber = ((long)record.Epoch << 48) + record.SequenceNumber;
data = session.Cipher.DecodeCiphertext(sequenceNumber, (byte)TRecordType.Handshake, record.Fragment, 0, record.Fragment.Length);
}
else
{
data = record.Fragment;
}
}
else
{
data = record.Fragment;
}
using (MemoryStream stream = new MemoryStream(data))
{
HandshakeRecord handshakeRecord = HandshakeRecord.Deserialise(stream);
if (handshakeRecord != null)
{
#if DEBUG
Console.WriteLine(handshakeRecord.MessageType.ToString());
#endif
switch (handshakeRecord.MessageType)
{
case THandshakeType.HelloRequest:
//HelloReq
break;
case THandshakeType.ClientHello:
ClientHello clientHello = ClientHello.Deserialise(stream);
if (clientHello != null)
{
byte[] cookie = clientHello.CalculateCookie(record.RemoteEndPoint, _HelloSecret);
if (clientHello.Cookie == null)
{
Version version = clientHello.ClientVersion;
if (ServerVersion < version)
{
version = ServerVersion;
}
if (session == null)
{
session = new Session
{
SessionID = Guid.NewGuid(),
RemoteEndPoint = record.RemoteEndPoint,
Version = version
};
Sessions.AddSession(address, session);
}
else
{
session.Reset();
session.Version = version;
}
session.ClientEpoch = record.Epoch;
session.ClientSequenceNumber = record.SequenceNumber;
//session.Handshake.UpdateHandshakeHash(data);
HelloVerifyRequest helloVerifyRequest = new HelloVerifyRequest
{
Cookie = cookie,
ServerVersion = ServerVersion
};
SendResponse(session, (IHandshakeMessage)helloVerifyRequest, 0);
}
else
{
if (session != null && session.Cipher != null && !session.IsEncypted(record))
{
session.Reset();
}
if (TLSUtils.ByteArrayCompare(clientHello.Cookie, cookie))
{
Version version = clientHello.ClientVersion;
if (ServerVersion < version)
{
version = ServerVersion;
}
if (clientHello.SessionID == null)
{
if (session == null)
{
session = new Session();
session.NextSequenceNumber();
session.SessionID = Guid.NewGuid();
session.RemoteEndPoint = record.RemoteEndPoint;
Sessions.AddSession(address, session);
}
}
else
{
Guid sessionID = Guid.Empty;
if (clientHello.SessionID.Length >= 16)
{
byte[] receivedSessionID = new byte[16];
Buffer.BlockCopy(clientHello.SessionID, 0, receivedSessionID, 0, 16);
sessionID = new Guid(receivedSessionID);
}
if (sessionID != Guid.Empty)
{
session = Sessions.GetSession(sessionID);
}
if (session == null)
{
//need to Find Session
session = new Session
{
SessionID = Guid.NewGuid()
};
session.NextSequenceNumber();
session.RemoteEndPoint = record.RemoteEndPoint;
Sessions.AddSession(address, session);
//session.Version = clientHello.ClientVersion;
}
}
session.Version = version;
session.Handshake.InitaliseHandshakeHash(version < DTLSRecord.Version1_2);
session.Handshake.UpdateHandshakeHash(data);
TCipherSuite cipherSuite = TCipherSuite.TLS_NULL_WITH_NULL_NULL;
foreach (TCipherSuite item in clientHello.CipherSuites)
{
if (_SupportedCipherSuites.ContainsKey(item) && CipherSuites.SupportedVersion(item, session.Version) && CipherSuites.SuiteUsable(item, PrivateKey, _PSKIdentities, _ValidatePSK != null))
{
cipherSuite = item;
break;
}
}
TKeyExchangeAlgorithm keyExchangeAlgorithm = CipherSuites.GetKeyExchangeAlgorithm(cipherSuite);
ServerHello serverHello = new ServerHello();
byte[] clientSessionID = new byte[32];
byte[] temp = session.SessionID.ToByteArray();
Buffer.BlockCopy(temp, 0, clientSessionID, 0, 16);
Buffer.BlockCopy(temp, 0, clientSessionID, 16, 16);
serverHello.SessionID = clientSessionID; // session.SessionID.ToByteArray();
serverHello.Random = new RandomData();
serverHello.Random.Generate();
serverHello.CipherSuite = (ushort)cipherSuite;
serverHello.ServerVersion = session.Version;
THashAlgorithm hash = THashAlgorithm.SHA256;
TEllipticCurve curve = TEllipticCurve.secp521r1;
if (clientHello.Extensions != null)
{
foreach (Extension extension in clientHello.Extensions)
{
if (extension.SpecifcExtension is ClientCertificateTypeExtension)
{
ClientCertificateTypeExtension clientCertificateType = extension.SpecifcExtension as ClientCertificateTypeExtension;
//TCertificateType certificateType = TCertificateType.Unknown;
//foreach (TCertificateType item in clientCertificateType.CertificateTypes)
//{
//}
//serverHello.AddExtension(new ClientCertificateTypeExtension(certificateType));
}
else if (extension.SpecifcExtension is EllipticCurvesExtension)
{
EllipticCurvesExtension ellipticCurves = extension.SpecifcExtension as EllipticCurvesExtension;
foreach (TEllipticCurve item in ellipticCurves.SupportedCurves)
{
if (EllipticCurveFactory.SupportedCurve(item))
{
curve = item;
break;
}
}
}
else if (extension.SpecifcExtension is ServerCertificateTypeExtension)
{
//serverHello.AddExtension();
}
else if (extension.SpecifcExtension is SignatureAlgorithmsExtension)
{
SignatureAlgorithmsExtension signatureAlgorithms = extension.SpecifcExtension as SignatureAlgorithmsExtension;
foreach (SignatureHashAlgorithm item in signatureAlgorithms.SupportedAlgorithms)
{
if (item.Signature == TSignatureAlgorithm.ECDSA)
{
hash = item.Hash;
break;
}
}
}
}
}
session.Handshake.CipherSuite = cipherSuite;
session.Handshake.ClientRandom = clientHello.Random;
session.Handshake.ServerRandom = serverHello.Random;
if (keyExchangeAlgorithm == TKeyExchangeAlgorithm.ECDHE_ECDSA)
{
EllipticCurvePointFormatsExtension pointFormatsExtension = new EllipticCurvePointFormatsExtension();
pointFormatsExtension.SupportedPointFormats.Add(TEllipticCurvePointFormat.Uncompressed);
serverHello.AddExtension(pointFormatsExtension);
}
session.Handshake.MessageSequence = 1;
SendResponse(session, serverHello, session.Handshake.MessageSequence);
session.Handshake.MessageSequence++;
if (keyExchangeAlgorithm == TKeyExchangeAlgorithm.ECDHE_ECDSA)
{
if (Certificate != null)
{
SendResponse(session, Certificate, session.Handshake.MessageSequence);
session.Handshake.MessageSequence++;
}
ECDHEKeyExchange keyExchange = new ECDHEKeyExchange
{
Curve = curve,
KeyExchangeAlgorithm = keyExchangeAlgorithm,
ClientRandom = clientHello.Random,
ServerRandom = serverHello.Random
};
keyExchange.GenerateEphemeralKey();
session.Handshake.KeyExchange = keyExchange;
if (session.Version == DTLSRecord.DefaultVersion)
{
hash = THashAlgorithm.SHA1;
}
ECDHEServerKeyExchange serverKeyExchange = new ECDHEServerKeyExchange(keyExchange, hash, TSignatureAlgorithm.ECDSA, PrivateKey);
SendResponse(session, serverKeyExchange, session.Handshake.MessageSequence);
session.Handshake.MessageSequence++;
if (_RequireClientCertificate)
{
CertificateRequest certificateRequest = new CertificateRequest();
certificateRequest.CertificateTypes.Add(TClientCertificateType.ECDSASign);
certificateRequest.SupportedAlgorithms.Add(new SignatureHashAlgorithm()
{
Hash = THashAlgorithm.SHA256, Signature = TSignatureAlgorithm.ECDSA
});
SendResponse(session, certificateRequest, session.Handshake.MessageSequence);
session.Handshake.MessageSequence++;
}
}
else if (keyExchangeAlgorithm == TKeyExchangeAlgorithm.ECDHE_PSK)
{
ECDHEKeyExchange keyExchange = new ECDHEKeyExchange
{
Curve = curve,
KeyExchangeAlgorithm = keyExchangeAlgorithm,
ClientRandom = clientHello.Random,
ServerRandom = serverHello.Random
};
keyExchange.GenerateEphemeralKey();
session.Handshake.KeyExchange = keyExchange;
ECDHEPSKServerKeyExchange serverKeyExchange = new ECDHEPSKServerKeyExchange(keyExchange);
SendResponse(session, serverKeyExchange, session.Handshake.MessageSequence);
session.Handshake.MessageSequence++;
}
else if (keyExchangeAlgorithm == TKeyExchangeAlgorithm.PSK)
{
PSKKeyExchange keyExchange = new PSKKeyExchange
{
KeyExchangeAlgorithm = keyExchangeAlgorithm,
ClientRandom = clientHello.Random,
ServerRandom = serverHello.Random
};
session.Handshake.KeyExchange = keyExchange;
//Need to be able to hint identity?? for PSK if not hinting don't really need key exchange message
//PSKServerKeyExchange serverKeyExchange = new PSKServerKeyExchange();
//SendResponse(session, serverKeyExchange, session.Handshake.MessageSequence);
//session.Handshake.MessageSequence++;
}
SendResponse(session, new ServerHelloDone(), session.Handshake.MessageSequence);
session.Handshake.MessageSequence++;
}
}
}
break;
case THandshakeType.ServerHello:
break;
case THandshakeType.HelloVerifyRequest:
break;
case THandshakeType.Certificate:
Certificate clientCertificate = Certificate.Deserialise(stream, TCertificateType.X509);
if (clientCertificate.CertChain.Count > 0)
{
session.CertificateInfo = Certificates.GetCertificateInfo(clientCertificate.CertChain[0], TCertificateFormat.CER);
}
session.Handshake.UpdateHandshakeHash(data);
break;
case THandshakeType.ServerKeyExchange:
break;
case THandshakeType.CertificateRequest:
break;
case THandshakeType.ServerHelloDone:
break;
case THandshakeType.CertificateVerify:
CertificateVerify certificateVerify = CertificateVerify.Deserialise(stream, session.Version);
session.Handshake.UpdateHandshakeHash(data);
break;
case THandshakeType.ClientKeyExchange:
if ((session == null) || (session.Handshake.KeyExchange == null))
{
}
else
{
session.Handshake.UpdateHandshakeHash(data);
byte[] preMasterSecret = null;
if (session.Handshake.KeyExchange.KeyExchangeAlgorithm == TKeyExchangeAlgorithm.ECDHE_ECDSA)
{
ECDHEClientKeyExchange clientKeyExchange = ECDHEClientKeyExchange.Deserialise(stream);
if (clientKeyExchange != null)
{
ECDHEKeyExchange ecKeyExchange = session.Handshake.KeyExchange as ECDHEKeyExchange;
preMasterSecret = ecKeyExchange.GetPreMasterSecret(clientKeyExchange.PublicKeyBytes);
}
}
else if (session.Handshake.KeyExchange.KeyExchangeAlgorithm == TKeyExchangeAlgorithm.ECDHE_PSK)
{
ECDHEPSKClientKeyExchange clientKeyExchange = ECDHEPSKClientKeyExchange.Deserialise(stream);
if (clientKeyExchange != null)
{
session.PSKIdentity = Encoding.UTF8.GetString(clientKeyExchange.PSKIdentity);
byte[] psk = _PSKIdentities.GetKey(clientKeyExchange.PSKIdentity);
if (psk == null)
{
psk = _ValidatePSK(clientKeyExchange.PSKIdentity);
if (psk != null)
{
_PSKIdentities.AddIdentity(clientKeyExchange.PSKIdentity, psk);
}
}
if (psk != null)
{
ECDHEKeyExchange ecKeyExchange = session.Handshake.KeyExchange as ECDHEKeyExchange;
byte[] otherSecret = ecKeyExchange.GetPreMasterSecret(clientKeyExchange.PublicKeyBytes);
preMasterSecret = TLSUtils.GetPSKPreMasterSecret(otherSecret, psk);
}
}
}
else if (session.Handshake.KeyExchange.KeyExchangeAlgorithm == TKeyExchangeAlgorithm.PSK)
{
PSKClientKeyExchange clientKeyExchange = PSKClientKeyExchange.Deserialise(stream);
if (clientKeyExchange != null)
{
session.PSKIdentity = Encoding.UTF8.GetString(clientKeyExchange.PSKIdentity);
byte[] psk = _PSKIdentities.GetKey(clientKeyExchange.PSKIdentity);
if (psk == null)
{
psk = _ValidatePSK(clientKeyExchange.PSKIdentity);
if (psk != null)
{
_PSKIdentities.AddIdentity(clientKeyExchange.PSKIdentity, psk);
}
}
if (psk != null)
{
ECDHEKeyExchange ecKeyExchange = session.Handshake.KeyExchange as ECDHEKeyExchange;
byte[] otherSecret = new byte[psk.Length];
preMasterSecret = TLSUtils.GetPSKPreMasterSecret(otherSecret, psk);
}
}
}
if (preMasterSecret != null)
{
//session.MasterSecret = TLSUtils.CalculateMasterSecret(preMasterSecret, session.KeyExchange);
//TLSUtils.AssignCipher(session);
session.Cipher = TLSUtils.AssignCipher(preMasterSecret, false, session.Version, session.Handshake);
}
else
{
Console.WriteLine($"preMasterSecret is null!");
}
}
break;
case THandshakeType.Finished:
Finished finished = Finished.Deserialise(stream);
if (session != null)
{
byte[] handshakeHash = session.Handshake.GetHash();
byte[] calculatedVerifyData = TLSUtils.GetVerifyData(session.Version, session.Handshake, false, true, handshakeHash);
#if DEBUG
Console.Write($"Handshake Hash: {TLSUtils.WriteToString(handshakeHash)}");
Console.Write($"Sent Verify: {TLSUtils.WriteToString(finished.VerifyData)}");
Console.Write($"Calc Verify: {TLSUtils.WriteToString(calculatedVerifyData)}");
#endif
if (TLSUtils.ByteArrayCompare(finished.VerifyData, calculatedVerifyData))
{
SendChangeCipherSpec(session);
session.Handshake.UpdateHandshakeHash(data);
handshakeHash = session.Handshake.GetHash();
Finished serverFinished = new Finished
{
VerifyData = TLSUtils.GetVerifyData(session.Version, session.Handshake, false, false, handshakeHash)
};
SendResponse(session, serverFinished, session.Handshake.MessageSequence);
session.Handshake.MessageSequence++;
}
else
{
throw new Exception();
}
}
break;
default:
break;
}
}
}
}
private ISigner GetSigner(TSignatureAlgorithm signatureAlgorithm, THashAlgorithm hashAlgorithm, AsymmetricKeyParameter serverPrivateKey)
{
ISigner result = null;
switch (signatureAlgorithm)
{
case TSignatureAlgorithm.Anonymous:
break;
case TSignatureAlgorithm.RSA:
break;
case TSignatureAlgorithm.DSA:
break;
case TSignatureAlgorithm.ECDSA:
result = new DsaDigestSigner(new ECDsaSigner(), GetDigest(hashAlgorithm));
break;
default:
break;
}
result.Init(true, serverPrivateKey);
//result.Init(true, new ParametersWithRandom(serverPrivateKey, this.mContext.SecureRandom));
return result;
}
private IDigest GetDigest(THashAlgorithm hashAlgorithm)
{
IDigest result = null;
switch (hashAlgorithm)
{
case THashAlgorithm.None:
result = new NullDigest();
break;
case THashAlgorithm.MD5:
result = new MD5Digest();
break;
case THashAlgorithm.SHA1:
result = new Sha1Digest();
break;
case THashAlgorithm.SHA224:
result = new Sha224Digest();
break;
case THashAlgorithm.SHA256:
result = new Sha256Digest();
break;
case THashAlgorithm.SHA384:
result = new Sha384Digest();
break;
case THashAlgorithm.SHA512:
result = new Sha512Digest();
break;
default:
break;
}
return result;
}
public ECDHEServerKeyExchange(ECDHEKeyExchange keyExchange, THashAlgorithm hashAlgorithm, TSignatureAlgorithm signatureAlgorithm, AsymmetricKeyParameter serverPrivateKey)
{
_EllipticCurveType = TEllipticCurveType.NamedCurve;
_EllipticCurve = keyExchange.Curve;
_HashAlgorithm = hashAlgorithm;
_SignatureAlgorithm = signatureAlgorithm;
System.IO.MemoryStream stream = new System.IO.MemoryStream();
stream.WriteByte((byte)_EllipticCurveType);
NetworkByteOrderConverter.WriteUInt16(stream, (ushort)_EllipticCurve);
byte[] pointEncoded = keyExchange.PublicKey.Q.GetEncoded(false);
stream.WriteByte((byte)pointEncoded.Length);
stream.Write(pointEncoded, 0, pointEncoded.Length);
_ServerParams = stream.ToArray();
//IDigest hashMD5 = GetDigest(THashAlgorithm.MD5);
//IDigest hashSHA = GetDigest(THashAlgorithm.SHA1);
//int size = hashMD5.GetDigestSize();
//byte[] hash = new byte[size + hashSHA.GetDigestSize()];
//hashMD5.BlockUpdate(clientRandom.RandomBytes, 0, clientRandom.RandomBytes.Length);
//hashMD5.BlockUpdate(serverRandom.RandomBytes, 0, serverRandom.RandomBytes.Length);
//hashMD5.BlockUpdate(_ServerParams, 0, _ServerParams.Length);
//hashMD5.DoFinal(hash, 0);
//hashSHA.BlockUpdate(clientRandom.RandomBytes, 0, clientRandom.RandomBytes.Length);
//hashSHA.BlockUpdate(serverRandom.RandomBytes, 0, serverRandom.RandomBytes.Length);
//hashSHA.BlockUpdate(_ServerParams, 0, _ServerParams.Length);
//hashSHA.DoFinal(hash, size);
//ISigner signer = GetSigner(signatureAlgorithm, THashAlgorithm.None, serverPrivateKey);
//signer.BlockUpdate(hash, 0, hash.Length);
//_Signature = signer.GenerateSignature();
ISigner signer = GetSigner(signatureAlgorithm, hashAlgorithm, serverPrivateKey);
byte[] clientRandomBytes = keyExchange.ClientRandom.Serialise();
byte[] serverRandomBytes = keyExchange.ServerRandom.Serialise();
signer.BlockUpdate(clientRandomBytes, 0, clientRandomBytes.Length);
signer.BlockUpdate(serverRandomBytes, 0, serverRandomBytes.Length);
signer.BlockUpdate(_ServerParams, 0, _ServerParams.Length);
_Signature = signer.GenerateSignature();
}
