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[] GetRenegotiateBytes()
{
if (IsNegotiating())
{
return(null);
}
HandshakeMessage hm = new HandshakeMessage(HandshakeType.HelloRequest, new byte[0]);
return(m_RecordLayer.EncryptBytes(hm.ToBytes(), 0, 4, ContentType.Handshake));
}
protected override byte[] GetFinishedMessage() {
byte[] temp, hash = new byte[36];
m_LocalMD5Hash.TransformFinalBlock(new byte[0], 0, 0);
m_LocalSHA1Hash.TransformFinalBlock(new byte[0], 0, 0);
Array.Copy(m_LocalMD5Hash.Hash, 0, hash, 0, 16);
Array.Copy(m_LocalSHA1Hash.Hash, 0, hash, 16, 20);
PseudoRandomDeriveBytes prf = new PseudoRandomDeriveBytes(m_MasterSecret, "server finished", hash);
HandshakeMessage hm = new HandshakeMessage(HandshakeType.Finished, prf.GetBytes(12));
temp = hm.ToBytes();
prf.Dispose();
return temp;
}
protected override byte[] GetFinishedMessage() {
HandshakeMessage hm = new HandshakeMessage(HandshakeType.Finished, null);
byte[] hash = new byte[36];
m_LocalMD5Hash.TransformFinalBlock(new byte[0], 0, 0);
m_LocalSHA1Hash.TransformFinalBlock(new byte[0], 0, 0);
Array.Copy(m_LocalMD5Hash.Hash, 0, hash, 0, 16);
Array.Copy(m_LocalSHA1Hash.Hash, 0, hash, 16, 20);
PseudoRandomDeriveBytes prf = new PseudoRandomDeriveBytes(m_MasterSecret, "client finished", hash);
hm.fragment = prf.GetBytes(12);
prf.Dispose();
return hm.ToBytes();
}
protected override byte[] GetFinishedMessage() {
HandshakeMessage hm = new HandshakeMessage(HandshakeType.Finished, new byte[36]);
Ssl3HandshakeMac md5 = new Ssl3HandshakeMac(HashType.MD5, m_LocalMD5Hash, m_MasterSecret);
Ssl3HandshakeMac sha1 = new Ssl3HandshakeMac(HashType.SHA1, m_LocalSHA1Hash, m_MasterSecret);
md5.TransformFinalBlock(new byte[]{0x53, 0x52, 0x56, 0x52}, 0, 4);
sha1.TransformFinalBlock(new byte[]{0x53, 0x52, 0x56, 0x52}, 0, 4);
Array.Copy(md5.Hash, 0, hm.fragment, 0, 16);
Array.Copy(sha1.Hash, 0, hm.fragment, 16, 20);
md5.Clear();
sha1.Clear();
return hm.ToBytes();
}
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);
}
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));
}
protected override byte[] GetRenegotiateBytes() {
if (IsNegotiating())
return null;
HandshakeMessage hm = new HandshakeMessage(HandshakeType.HelloRequest, new byte[0]);
return m_RecordLayer.EncryptBytes(hm.ToBytes(), 0, 4, ContentType.Handshake);
}
protected SslHandshakeStatus GetClientHelloResult() {
MemoryStream retMessage = new MemoryStream();
SslHandshakeStatus ret = new SslHandshakeStatus();
HandshakeMessage temp;
byte[] bytes;
// ServerHello message
temp = new HandshakeMessage(HandshakeType.ServerHello, new byte[38]);
m_ServerTime = GetUnixTime();
m_ServerRandom = new byte[28];
m_RNG.GetBytes(m_ServerRandom);
temp.fragment[0] = GetVersion().major;
temp.fragment[1] = GetVersion().minor;
Array.Copy(m_ServerTime, 0, temp.fragment, 2, 4);
Array.Copy(m_ServerRandom, 0, temp.fragment, 6, 28);
temp.fragment[34] = 0; // do not resume a session, and do not let the other side cache it
Array.Copy(CipherSuites.GetCipherAlgorithmBytes(m_EncryptionScheme), 0, temp.fragment, 35, 2);
temp.fragment[37] = CompressionAlgorithm.GetAlgorithmByte(m_CompressionMethod);
bytes = temp.ToBytes();
retMessage.Write(bytes, 0, bytes.Length);
// Certificate message
byte[] certs = GetCertificateList(m_Options.Certificate);
temp.type = HandshakeType.Certificate;
temp.fragment = certs;
bytes = temp.ToBytes();
retMessage.Write(bytes, 0, bytes.Length);
// ServerKeyExchange message [optional] => only with RSA_EXPORT and public key > 512 bits
if (m_Options.Certificate.GetPublicKeyLength() > 512 && CipherSuites.GetCipherDefinition(m_EncryptionScheme).Exportable) {
MemoryStream kes = new MemoryStream();
MD5SHA1CryptoServiceProvider mscsp = new MD5SHA1CryptoServiceProvider();
// hash the client and server random values
mscsp.TransformBlock(m_ClientTime, 0, 4, m_ClientTime, 0);
mscsp.TransformBlock(m_ClientRandom, 0, 28, m_ClientRandom, 0);
mscsp.TransformBlock(m_ServerTime, 0, 4, m_ServerTime, 0);
mscsp.TransformBlock(m_ServerRandom, 0, 28, m_ServerRandom, 0);
// create a new 512 bit RSA key
m_KeyCipher = new RSACryptoServiceProvider(512);
RSAParameters p = m_KeyCipher.ExportParameters(false);
// write the key parameters to the output stream
bytes = new byte[]{(byte)(p.Modulus.Length / 256), (byte)(p.Modulus.Length % 256)};
kes.Write(bytes, 0, 2);
kes.Write(p.Modulus, 0, p.Modulus.Length);
mscsp.TransformBlock(bytes, 0, 2, bytes, 0);
mscsp.TransformBlock(p.Modulus, 0, p.Modulus.Length, p.Modulus, 0);
bytes = new byte[]{(byte)(p.Exponent.Length / 256), (byte)(p.Exponent.Length % 256)};
kes.Write(bytes, 0, 2);
kes.Write(p.Exponent, 0, p.Exponent.Length);
mscsp.TransformBlock(bytes, 0, 2, bytes, 0);
mscsp.TransformFinalBlock(p.Exponent, 0, p.Exponent.Length);
// create signature
bytes = mscsp.CreateSignature(m_Options.Certificate);
kes.Write(new byte[]{(byte)(bytes.Length / 256), (byte)(bytes.Length % 256)}, 0, 2);
kes.Write(bytes, 0, bytes.Length);
// write to output
temp.type = HandshakeType.ServerKeyExchange;
temp.fragment = kes.ToArray();
bytes = temp.ToBytes();
retMessage.Write(bytes, 0, bytes.Length);
kes.Close();
} else {
m_KeyCipher = (RSACryptoServiceProvider)m_Options.Certificate.PrivateKey;
}
// CertificateRequest message [optional]
if (m_MutualAuthentication) {
bytes = GetDistinguishedNames();
if (bytes.Length != 0) { // make sure at least one certificate is returned
temp.type = HandshakeType.CertificateRequest;
temp.fragment = new byte[bytes.Length + 4];
temp.fragment[0] = 1; // one certificate type supported
temp.fragment[1] = 1; // cert type RSA
temp.fragment[2] = (byte)(bytes.Length / 256);
temp.fragment[3] = (byte)(bytes.Length % 256);
Array.Copy(bytes, 0, temp.fragment, 4, bytes.Length);
bytes = temp.ToBytes();
retMessage.Write(bytes, 0, bytes.Length);
}
}
// ServerHelloDone message
temp.type = HandshakeType.ServerHelloDone;
temp.fragment = new byte[0];
bytes = temp.ToBytes();
retMessage.Write(bytes, 0, bytes.Length);
// final adjustments
ret.Status = SslStatus.ContinueNeeded;
ret.Message = retMessage.ToArray();
retMessage.Close();
UpdateHashes(ret.Message, HashUpdate.All); // output message
ret.Message = m_RecordLayer.EncryptBytes(ret.Message, 0, ret.Message.Length, ContentType.Handshake);
return ret;
}
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 SslHandshakeStatus GetClientHelloResult()
{
MemoryStream retMessage = new MemoryStream();
SslHandshakeStatus ret = new SslHandshakeStatus();
HandshakeMessage temp;
byte[] bytes;
// ServerHello message
temp = new HandshakeMessage(HandshakeType.ServerHello, new byte[38]);
m_ServerTime = GetUnixTime();
m_ServerRandom = new byte[28];
m_RNG.GetBytes(m_ServerRandom);
temp.fragment[0] = GetVersion().major;
temp.fragment[1] = GetVersion().minor;
Array.Copy(m_ServerTime, 0, temp.fragment, 2, 4);
Array.Copy(m_ServerRandom, 0, temp.fragment, 6, 28);
temp.fragment[34] = 0; // do not resume a session, and do not let the other side cache it
Array.Copy(CipherSuites.GetCipherAlgorithmBytes(m_EncryptionScheme), 0, temp.fragment, 35, 2);
temp.fragment[37] = CompressionAlgorithm.GetAlgorithmByte(m_CompressionMethod);
bytes = temp.ToBytes();
retMessage.Write(bytes, 0, bytes.Length);
// Certificate message
byte[] certs = GetCertificateList(m_Options.Certificate);
temp.type = HandshakeType.Certificate;
temp.fragment = certs;
bytes = temp.ToBytes();
retMessage.Write(bytes, 0, bytes.Length);
// ServerKeyExchange message [optional] => only with RSA_EXPORT and public key > 512 bits
if (m_Options.Certificate.GetPublicKeyLength() > 512 && CipherSuites.GetCipherDefinition(m_EncryptionScheme).Exportable)
{
MemoryStream kes = new MemoryStream();
MD5SHA1CryptoServiceProvider mscsp = new MD5SHA1CryptoServiceProvider();
// hash the client and server random values
mscsp.TransformBlock(m_ClientTime, 0, 4, m_ClientTime, 0);
mscsp.TransformBlock(m_ClientRandom, 0, 28, m_ClientRandom, 0);
mscsp.TransformBlock(m_ServerTime, 0, 4, m_ServerTime, 0);
mscsp.TransformBlock(m_ServerRandom, 0, 28, m_ServerRandom, 0);
// create a new 512 bit RSA key
m_KeyCipher = new RSACryptoServiceProvider(512);
RSAParameters p = m_KeyCipher.ExportParameters(false);
// write the key parameters to the output stream
bytes = new byte[] { (byte)(p.Modulus.Length / 256), (byte)(p.Modulus.Length % 256) };
kes.Write(bytes, 0, 2);
kes.Write(p.Modulus, 0, p.Modulus.Length);
mscsp.TransformBlock(bytes, 0, 2, bytes, 0);
mscsp.TransformBlock(p.Modulus, 0, p.Modulus.Length, p.Modulus, 0);
bytes = new byte[] { (byte)(p.Exponent.Length / 256), (byte)(p.Exponent.Length % 256) };
kes.Write(bytes, 0, 2);
kes.Write(p.Exponent, 0, p.Exponent.Length);
mscsp.TransformBlock(bytes, 0, 2, bytes, 0);
mscsp.TransformFinalBlock(p.Exponent, 0, p.Exponent.Length);
// create signature
bytes = mscsp.CreateSignature(m_Options.Certificate);
kes.Write(new byte[] { (byte)(bytes.Length / 256), (byte)(bytes.Length % 256) }, 0, 2);
kes.Write(bytes, 0, bytes.Length);
// write to output
temp.type = HandshakeType.ServerKeyExchange;
temp.fragment = kes.ToArray();
bytes = temp.ToBytes();
retMessage.Write(bytes, 0, bytes.Length);
kes.Close();
}
else
{
m_KeyCipher = (RSACryptoServiceProvider)m_Options.Certificate.PrivateKey;
}
// CertificateRequest message [optional]
if (m_MutualAuthentication)
{
bytes = GetDistinguishedNames();
if (bytes.Length != 0) // make sure at least one certificate is returned
{
temp.type = HandshakeType.CertificateRequest;
temp.fragment = new byte[bytes.Length + 4];
temp.fragment[0] = 1; // one certificate type supported
temp.fragment[1] = 1; // cert type RSA
temp.fragment[2] = (byte)(bytes.Length / 256);
temp.fragment[3] = (byte)(bytes.Length % 256);
Array.Copy(bytes, 0, temp.fragment, 4, bytes.Length);
bytes = temp.ToBytes();
retMessage.Write(bytes, 0, bytes.Length);
}
}
// ServerHelloDone message
temp.type = HandshakeType.ServerHelloDone;
temp.fragment = new byte[0];
bytes = temp.ToBytes();
retMessage.Write(bytes, 0, bytes.Length);
// final adjustments
ret.Status = SslStatus.ContinueNeeded;
ret.Message = retMessage.ToArray();
retMessage.Close();
UpdateHashes(ret.Message, HashUpdate.All); // output message
ret.Message = m_RecordLayer.EncryptBytes(ret.Message, 0, ret.Message.Length, ContentType.Handshake);
return(ret);
}
