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using System;
using System.Collections;
using System.IO;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Crypto.Tls
{
public abstract class TlsExtensionsUtilities
{
public static IDictionary EnsureExtensionsInitialised(IDictionary extensions)
{
return extensions == null ? Platform.CreateHashtable() : extensions;
}
public static void AddEncryptThenMacExtension(IDictionary extensions)
{
extensions[ExtensionType.encrypt_then_mac] = CreateEncryptThenMacExtension();
}
public static void AddExtendedMasterSecretExtension(IDictionary extensions)
{
extensions[ExtensionType.extended_master_secret] = CreateExtendedMasterSecretExtension();
}
/// <exception cref="IOException"></exception>
public static void AddHeartbeatExtension(IDictionary extensions, HeartbeatExtension heartbeatExtension)
{
extensions[ExtensionType.heartbeat] = CreateHeartbeatExtension(heartbeatExtension);
}
/// <exception cref="IOException"></exception>
public static void AddMaxFragmentLengthExtension(IDictionary extensions, byte maxFragmentLength)
{
extensions[ExtensionType.max_fragment_length] = CreateMaxFragmentLengthExtension(maxFragmentLength);
}
/// <exception cref="IOException"></exception>
public static void AddPaddingExtension(IDictionary extensions, int dataLength)
{
extensions[ExtensionType.padding] = CreatePaddingExtension(dataLength);
}
/// <exception cref="IOException"></exception>
public static void AddServerNameExtension(IDictionary extensions, ServerNameList serverNameList)
{
extensions[ExtensionType.server_name] = CreateServerNameExtension(serverNameList);
}
/// <exception cref="IOException"></exception>
public static void AddStatusRequestExtension(IDictionary extensions, CertificateStatusRequest statusRequest)
{
extensions[ExtensionType.status_request] = CreateStatusRequestExtension(statusRequest);
}
public static void AddTruncatedHMacExtension(IDictionary extensions)
{
extensions[ExtensionType.truncated_hmac] = CreateTruncatedHMacExtension();
}
/// <exception cref="IOException"></exception>
public static HeartbeatExtension GetHeartbeatExtension(IDictionary extensions)
{
byte[] extensionData = TlsUtilities.GetExtensionData(extensions, ExtensionType.heartbeat);
return extensionData == null ? null : ReadHeartbeatExtension(extensionData);
}
/// <exception cref="IOException"></exception>
public static short GetMaxFragmentLengthExtension(IDictionary extensions)
{
byte[] extensionData = TlsUtilities.GetExtensionData(extensions, ExtensionType.max_fragment_length);
return extensionData == null ? (short)-1 : (short)ReadMaxFragmentLengthExtension(extensionData);
}
/// <exception cref="IOException"></exception>
public static int GetPaddingExtension(IDictionary extensions)
{
byte[] extensionData = TlsUtilities.GetExtensionData(extensions, ExtensionType.padding);
return extensionData == null ? -1 : ReadPaddingExtension(extensionData);
}
/// <exception cref="IOException"></exception>
public static ServerNameList GetServerNameExtension(IDictionary extensions)
{
byte[] extensionData = TlsUtilities.GetExtensionData(extensions, ExtensionType.server_name);
return extensionData == null ? null : ReadServerNameExtension(extensionData);
}
/// <exception cref="IOException"></exception>
public static CertificateStatusRequest GetStatusRequestExtension(IDictionary extensions)
{
byte[] extensionData = TlsUtilities.GetExtensionData(extensions, ExtensionType.status_request);
return extensionData == null ? null : ReadStatusRequestExtension(extensionData);
}
/// <exception cref="IOException"></exception>
public static bool HasEncryptThenMacExtension(IDictionary extensions)
{
byte[] extensionData = TlsUtilities.GetExtensionData(extensions, ExtensionType.encrypt_then_mac);
return extensionData == null ? false : ReadEncryptThenMacExtension(extensionData);
}
/// <exception cref="IOException"></exception>
public static bool HasExtendedMasterSecretExtension(IDictionary extensions)
{
byte[] extensionData = TlsUtilities.GetExtensionData(extensions, ExtensionType.extended_master_secret);
return extensionData == null ? false : ReadExtendedMasterSecretExtension(extensionData);
}
/// <exception cref="IOException"></exception>
public static bool HasTruncatedHMacExtension(IDictionary extensions)
{
byte[] extensionData = TlsUtilities.GetExtensionData(extensions, ExtensionType.truncated_hmac);
return extensionData == null ? false : ReadTruncatedHMacExtension(extensionData);
}
public static byte[] CreateEmptyExtensionData()
{
return TlsUtilities.EmptyBytes;
}
public static byte[] CreateEncryptThenMacExtension()
{
return CreateEmptyExtensionData();
}
public static byte[] CreateExtendedMasterSecretExtension()
{
return CreateEmptyExtensionData();
}
/// <exception cref="IOException"></exception>
public static byte[] CreateHeartbeatExtension(HeartbeatExtension heartbeatExtension)
{
if (heartbeatExtension == null)
throw new TlsFatalAlert(AlertDescription.internal_error);
MemoryStream buf = new MemoryStream();
heartbeatExtension.Encode(buf);
return buf.ToArray();
}
/// <exception cref="IOException"></exception>
public static byte[] CreateMaxFragmentLengthExtension(byte maxFragmentLength)
{
return new byte[]{ maxFragmentLength };
}
/// <exception cref="IOException"></exception>
public static byte[] CreatePaddingExtension(int dataLength)
{
TlsUtilities.CheckUint16(dataLength);
return new byte[dataLength];
}
/// <exception cref="IOException"></exception>
public static byte[] CreateServerNameExtension(ServerNameList serverNameList)
{
if (serverNameList == null)
throw new TlsFatalAlert(AlertDescription.internal_error);
MemoryStream buf = new MemoryStream();
serverNameList.Encode(buf);
return buf.ToArray();
}
/// <exception cref="IOException"></exception>
public static byte[] CreateStatusRequestExtension(CertificateStatusRequest statusRequest)
{
if (statusRequest == null)
{
throw new TlsFatalAlert(AlertDescription.internal_error);
}
MemoryStream buf = new MemoryStream();
statusRequest.Encode(buf);
return buf.ToArray();
}
public static byte[] CreateTruncatedHMacExtension()
{
return CreateEmptyExtensionData();
}
/// <exception cref="IOException"></exception>
private static bool ReadEmptyExtensionData(byte[] extensionData)
{
if (extensionData == null)
throw new ArgumentNullException("extensionData");
if (extensionData.Length != 0)
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
return true;
}
/// <exception cref="IOException"></exception>
public static bool ReadEncryptThenMacExtension(byte[] extensionData)
{
return ReadEmptyExtensionData(extensionData);
}
/// <exception cref="IOException"></exception>
public static bool ReadExtendedMasterSecretExtension(byte[] extensionData)
{
return ReadEmptyExtensionData(extensionData);
}
/// <exception cref="IOException"></exception>
public static HeartbeatExtension ReadHeartbeatExtension(byte[] extensionData)
{
if (extensionData == null)
throw new ArgumentNullException("extensionData");
MemoryStream buf = new MemoryStream(extensionData, false);
HeartbeatExtension heartbeatExtension = HeartbeatExtension.Parse(buf);
TlsProtocol.AssertEmpty(buf);
return heartbeatExtension;
}
/// <exception cref="IOException"></exception>
public static short ReadMaxFragmentLengthExtension(byte[] extensionData)
{
if (extensionData == null)
throw new ArgumentNullException("extensionData");
if (extensionData.Length != 1)
throw new TlsFatalAlert(AlertDescription.decode_error);
return extensionData[0];
}
/// <exception cref="IOException"></exception>
public static int ReadPaddingExtension(byte[] extensionData)
{
if (extensionData == null)
throw new ArgumentNullException("extensionData");
for (int i = 0; i < extensionData.Length; ++i)
{
if (extensionData[i] != 0)
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
return extensionData.Length;
}
/// <exception cref="IOException"></exception>
public static ServerNameList ReadServerNameExtension(byte[] extensionData)
{
if (extensionData == null)
throw new ArgumentNullException("extensionData");
MemoryStream buf = new MemoryStream(extensionData, false);
ServerNameList serverNameList = ServerNameList.Parse(buf);
TlsProtocol.AssertEmpty(buf);
return serverNameList;
}
/// <exception cref="IOException"></exception>
public static CertificateStatusRequest ReadStatusRequestExtension(byte[] extensionData)
{
if (extensionData == null)
throw new ArgumentNullException("extensionData");
MemoryStream buf = new MemoryStream(extensionData, false);
CertificateStatusRequest statusRequest = CertificateStatusRequest.Parse(buf);
TlsProtocol.AssertEmpty(buf);
return statusRequest;
}
/// <exception cref="IOException"></exception>
public static bool ReadTruncatedHMacExtension(byte[] extensionData)
{
return ReadEmptyExtensionData(extensionData);
}
}
}
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