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using System;
using System.Collections;
using System.IO;
using Org.BouncyCastle.Tls.Crypto;
namespace Org.BouncyCastle.Tls
{
public class SrpTlsServer
: AbstractTlsServer
{
private static readonly int[] DefaultCipherSuites = new int[]
{
CipherSuite.TLS_SRP_SHA_DSS_WITH_AES_256_CBC_SHA,
CipherSuite.TLS_SRP_SHA_DSS_WITH_AES_128_CBC_SHA,
CipherSuite.TLS_SRP_SHA_RSA_WITH_AES_256_CBC_SHA,
CipherSuite.TLS_SRP_SHA_RSA_WITH_AES_128_CBC_SHA,
CipherSuite.TLS_SRP_SHA_WITH_AES_256_CBC_SHA,
CipherSuite.TLS_SRP_SHA_WITH_AES_128_CBC_SHA
};
protected readonly TlsSrpIdentityManager m_srpIdentityManager;
protected byte[] m_srpIdentity = null;
protected TlsSrpLoginParameters m_srpLoginParameters = null;
public SrpTlsServer(TlsCrypto crypto, TlsSrpIdentityManager srpIdentityManager)
: base(crypto)
{
this.m_srpIdentityManager = srpIdentityManager;
}
/// <exception cref="IOException"/>
protected virtual TlsCredentialedSigner GetDsaSignerCredentials()
{
throw new TlsFatalAlert(AlertDescription.internal_error);
}
/// <exception cref="IOException"/>
protected virtual TlsCredentialedSigner GetRsaSignerCredentials()
{
throw new TlsFatalAlert(AlertDescription.internal_error);
}
protected override ProtocolVersion[] GetSupportedVersions()
{
return ProtocolVersion.TLSv12.Only();
}
protected override int[] GetSupportedCipherSuites()
{
return TlsUtilities.GetSupportedCipherSuites(Crypto, DefaultCipherSuites);
}
public override void ProcessClientExtensions(IDictionary clientExtensions)
{
base.ProcessClientExtensions(clientExtensions);
this.m_srpIdentity = TlsSrpUtilities.GetSrpExtension(clientExtensions);
}
public override int GetSelectedCipherSuite()
{
int cipherSuite = base.GetSelectedCipherSuite();
if (TlsSrpUtilities.IsSrpCipherSuite(cipherSuite))
{
if (m_srpIdentity != null)
{
this.m_srpLoginParameters = m_srpIdentityManager.GetLoginParameters(m_srpIdentity);
}
if (m_srpLoginParameters == null)
throw new TlsFatalAlert(AlertDescription.unknown_psk_identity);
}
return cipherSuite;
}
public override TlsCredentials GetCredentials()
{
int keyExchangeAlgorithm = m_context.SecurityParameters.KeyExchangeAlgorithm;
switch (keyExchangeAlgorithm)
{
case KeyExchangeAlgorithm.SRP:
return null;
case KeyExchangeAlgorithm.SRP_DSS:
return GetDsaSignerCredentials();
case KeyExchangeAlgorithm.SRP_RSA:
return GetRsaSignerCredentials();
default:
// Note: internal error here; selected a key exchange we don't implement!
throw new TlsFatalAlert(AlertDescription.internal_error);
}
}
public override TlsSrpLoginParameters GetSrpLoginParameters()
{
return m_srpLoginParameters;
}
}
}
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