ServerHello
using Org.BouncyCastle.Utilities;
using System.Collections.Generic;
using System.IO;
namespace Org.BouncyCastle.Tls
{
public sealed class ServerHello
{
private static readonly byte[] HelloRetryRequestMagic = new byte[32] {
207,
33,
173,
116,
229,
154,
97,
17,
190,
29,
140,
2,
30,
101,
184,
145,
194,
162,
17,
22,
122,
187,
140,
94,
7,
158,
9,
226,
200,
168,
51,
156
};
private readonly ProtocolVersion m_version;
private readonly byte[] m_random;
private readonly byte[] m_sessionID;
private readonly int m_cipherSuite;
private readonly IDictionary<int, byte[]> m_extensions;
public int CipherSuite => m_cipherSuite;
public IDictionary<int, byte[]> Extensions => m_extensions;
public byte[] Random => m_random;
public byte[] SessionID => m_sessionID;
public ProtocolVersion Version => m_version;
public ServerHello(byte[] sessionID, int cipherSuite, IDictionary<int, byte[]> extensions)
: this(ProtocolVersion.TLSv12, Arrays.Clone(HelloRetryRequestMagic), sessionID, cipherSuite, extensions)
{
}
public ServerHello(ProtocolVersion version, byte[] random, byte[] sessionID, int cipherSuite, IDictionary<int, byte[]> extensions)
{
m_version = version;
m_random = random;
m_sessionID = sessionID;
m_cipherSuite = cipherSuite;
m_extensions = extensions;
}
public bool IsHelloRetryRequest()
{
return Arrays.AreEqual(HelloRetryRequestMagic, m_random);
}
public void Encode(TlsContext context, Stream output)
{
TlsUtilities.WriteVersion(m_version, output);
output.Write(m_random, 0, m_random.Length);
TlsUtilities.WriteOpaque8(m_sessionID, output);
TlsUtilities.WriteUint16(m_cipherSuite, output);
TlsUtilities.WriteUint8((short)0, output);
TlsProtocol.WriteExtensions(output, m_extensions);
}
public static ServerHello Parse(MemoryStream input)
{
ProtocolVersion version = TlsUtilities.ReadVersion(input);
byte[] random = TlsUtilities.ReadFully(32, input);
byte[] sessionID = TlsUtilities.ReadOpaque8(input, 0, 32);
int cipherSuite = TlsUtilities.ReadUint16(input);
if (TlsUtilities.ReadUint8(input) != 0)
throw new TlsFatalAlert(47);
IDictionary<int, byte[]> extensions = TlsProtocol.ReadExtensions(input);
return new ServerHello(version, random, sessionID, cipherSuite, extensions);
}
}
}