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using System;
using System.Collections;
using System.IO;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Crypto.Tls
{
public abstract class TlsSrpUtilities
{
public static void AddSrpExtension(IDictionary extensions, byte[] identity)
{
extensions[ExtensionType.srp] = CreateSrpExtension(identity);
}
public static byte[] GetSrpExtension(IDictionary extensions)
{
byte[] extensionData = TlsUtilities.GetExtensionData(extensions, ExtensionType.srp);
return extensionData == null ? null : ReadSrpExtension(extensionData);
}
public static byte[] CreateSrpExtension(byte[] identity)
{
if (identity == null)
throw new TlsFatalAlert(AlertDescription.internal_error);
return TlsUtilities.EncodeOpaque8(identity);
}
public static byte[] ReadSrpExtension(byte[] extensionData)
{
if (extensionData == null)
throw new ArgumentNullException("extensionData");
MemoryStream buf = new MemoryStream(extensionData, false);
byte[] identity = TlsUtilities.ReadOpaque8(buf);
TlsProtocol.AssertEmpty(buf);
return identity;
}
public static BigInteger ReadSrpParameter(Stream input)
{
return new BigInteger(1, TlsUtilities.ReadOpaque16(input));
}
public static void WriteSrpParameter(BigInteger x, Stream output)
{
TlsUtilities.WriteOpaque16(BigIntegers.AsUnsignedByteArray(x), output);
}
public static bool IsSrpCipherSuite(int cipherSuite)
{
switch (cipherSuite)
{
case CipherSuite.TLS_SRP_SHA_DSS_WITH_3DES_EDE_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_DSS_WITH_AES_128_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_DSS_WITH_AES_256_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_RSA_WITH_3DES_EDE_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_RSA_WITH_AES_128_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_RSA_WITH_AES_256_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_WITH_3DES_EDE_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_WITH_AES_128_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_WITH_AES_256_CBC_SHA:
return true;
default:
return false;
}
}
}
}
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