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using System;
using System.IO;
using Org.BouncyCastle.Tls.Crypto;
namespace Org.BouncyCastle.Tls
{
public class PskTlsServer
: AbstractTlsServer
{
private static readonly int[] DefaultCipherSuites = new int[]
{
CipherSuite.TLS_ECDHE_PSK_WITH_CHACHA20_POLY1305_SHA256,
CipherSuite.TLS_ECDHE_PSK_WITH_AES_256_CBC_SHA384,
CipherSuite.TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA256,
CipherSuite.TLS_ECDHE_PSK_WITH_AES_256_CBC_SHA,
CipherSuite.TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA,
CipherSuite.TLS_DHE_PSK_WITH_CHACHA20_POLY1305_SHA256,
CipherSuite.TLS_DHE_PSK_WITH_AES_256_GCM_SHA384,
CipherSuite.TLS_DHE_PSK_WITH_AES_128_GCM_SHA256,
CipherSuite.TLS_DHE_PSK_WITH_AES_256_CBC_SHA384,
CipherSuite.TLS_DHE_PSK_WITH_AES_128_CBC_SHA256,
CipherSuite.TLS_DHE_PSK_WITH_AES_256_CBC_SHA,
CipherSuite.TLS_DHE_PSK_WITH_AES_128_CBC_SHA
};
protected readonly TlsPskIdentityManager m_pskIdentityManager;
public PskTlsServer(TlsCrypto crypto, TlsPskIdentityManager pskIdentityManager)
: base(crypto)
{
this.m_pskIdentityManager = pskIdentityManager;
}
/// <exception cref="IOException"/>
protected virtual TlsCredentialedDecryptor GetRsaEncryptionCredentials()
{
throw new TlsFatalAlert(AlertDescription.internal_error);
}
protected override ProtocolVersion[] GetSupportedVersions()
{
return ProtocolVersion.TLSv12.DownTo(ProtocolVersion.TLSv10);
}
protected override int[] GetSupportedCipherSuites()
{
return TlsUtilities.GetSupportedCipherSuites(Crypto, DefaultCipherSuites);
}
public override TlsCredentials GetCredentials()
{
int keyExchangeAlgorithm = m_context.SecurityParameters.KeyExchangeAlgorithm;
switch (keyExchangeAlgorithm)
{
case KeyExchangeAlgorithm.DHE_PSK:
case KeyExchangeAlgorithm.ECDHE_PSK:
case KeyExchangeAlgorithm.PSK:
return null;
case KeyExchangeAlgorithm.RSA_PSK:
return GetRsaEncryptionCredentials();
default:
// Note: internal error here; selected a key exchange we don't implement!
throw new TlsFatalAlert(AlertDescription.internal_error);
}
}
public override TlsPskIdentityManager GetPskIdentityManager()
{
return m_pskIdentityManager;
}
}
}
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