TlsSrpUtilities
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Utilities;
using System;
using System.Collections.Generic;
using System.IO;
namespace Org.BouncyCastle.Tls
{
public abstract class TlsSrpUtilities
{
public static void AddSrpExtension(IDictionary<int, byte[]> extensions, byte[] identity)
{
extensions[12] = CreateSrpExtension(identity);
}
public static byte[] GetSrpExtension(IDictionary<int, byte[]> extensions)
{
byte[] extensionData = TlsUtilities.GetExtensionData(extensions, 12);
if (extensionData != null)
return ReadSrpExtension(extensionData);
return null;
}
public static byte[] CreateSrpExtension(byte[] identity)
{
if (identity == null)
throw new TlsFatalAlert(80);
return TlsUtilities.EncodeOpaque8(identity);
}
public static byte[] ReadSrpExtension(byte[] extensionData)
{
if (extensionData == null)
throw new ArgumentNullException("extensionData");
return TlsUtilities.DecodeOpaque8(extensionData, 1);
}
public static BigInteger ReadSrpParameter(Stream input)
{
return new BigInteger(1, TlsUtilities.ReadOpaque16(input, 1));
}
public static void WriteSrpParameter(BigInteger x, Stream output)
{
TlsUtilities.WriteOpaque16(BigIntegers.AsUnsignedByteArray(x), output);
}
public static bool IsSrpCipherSuite(int cipherSuite)
{
int keyExchangeAlgorithm = TlsUtilities.GetKeyExchangeAlgorithm(cipherSuite);
if ((uint)(keyExchangeAlgorithm - 21) <= 2)
return true;
return false;
}
}
}