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using System;
using System.Collections.Generic;
using System.IO;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Tls
{
public sealed class ServerHello
{
private static readonly byte[] HelloRetryRequestMagic = { 0xCF, 0x21, 0xAD, 0x74, 0xE5, 0x9A, 0x61, 0x11, 0xBE,
0x1D, 0x8C, 0x02, 0x1E, 0x65, 0xB8, 0x91, 0xC2, 0xA2, 0x11, 0x16, 0x7A, 0xBB, 0x8C, 0x5E, 0x07, 0x9E, 0x09,
0xE2, 0xC8, 0xA8, 0x33, 0x9C };
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 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)
{
this.m_version = version;
this.m_random = random;
this.m_sessionID = sessionID;
this.m_cipherSuite = cipherSuite;
this.m_extensions = extensions;
}
public int CipherSuite
{
get { return m_cipherSuite; }
}
public IDictionary<int, byte[]> Extensions
{
get { return m_extensions; }
}
public byte[] Random
{
get { return m_random; }
}
public byte[] SessionID
{
get { return m_sessionID; }
}
public ProtocolVersion Version
{
get { return m_version; }
}
public bool IsHelloRetryRequest()
{
return Arrays.AreEqual(HelloRetryRequestMagic, m_random);
}
/// <summary>Encode this <see cref="ServerHello"/> to a <see cref="Stream"/>.</summary>
/// <param name="context">the <see cref="TlsContext"/> of the current connection.</param>
/// <param name="output">the <see cref="Stream"/> to encode to.</param>
/// <exception cref="IOException"/>
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(CompressionMethod.cls_null, output);
TlsProtocol.WriteExtensions(output, m_extensions);
}
/// <summary>Parse a <see cref="ServerHello"/> from a <see cref="MemoryStream"/>.</summary>
/// <param name="input">the <see cref="MemoryStream"/> to parse from.</param>
/// <returns>a <see cref="ServerHello"/> object.</returns>
/// <exception cref="IOException"/>
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);
short compressionMethod = TlsUtilities.ReadUint8(input);
if (CompressionMethod.cls_null != compressionMethod)
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
var extensions = TlsProtocol.ReadExtensions(input);
return new ServerHello(version, random, sessionID, cipherSuite, extensions);
}
}
}
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