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package org.bouncycastle.crypto.tls;
import java.io.IOException;
import java.io.InputStream;
import java.util.Vector;
public abstract class AbstractTlsKeyExchange
implements TlsKeyExchange
{
protected int keyExchange;
protected Vector supportedSignatureAlgorithms;
protected TlsContext context;
protected AbstractTlsKeyExchange(int keyExchange, Vector supportedSignatureAlgorithms)
{
this.keyExchange = keyExchange;
this.supportedSignatureAlgorithms = supportedSignatureAlgorithms;
}
public void init(TlsContext context)
{
this.context = context;
ProtocolVersion clientVersion = context.getClientVersion();
if (TlsUtils.isSignatureAlgorithmsExtensionAllowed(clientVersion))
{
/*
* RFC 5264 7.4.1.4.1. If the client does not send the signature_algorithms extension,
* the server MUST do the following:
*
* - If the negotiated key exchange algorithm is one of (RSA, DHE_RSA, DH_RSA, RSA_PSK,
* ECDH_RSA, ECDHE_RSA), behave as if client had sent the value {sha1,rsa}.
*
* - If the negotiated key exchange algorithm is one of (DHE_DSS, DH_DSS), behave as if
* the client had sent the value {sha1,dsa}.
*
* - If the negotiated key exchange algorithm is one of (ECDH_ECDSA, ECDHE_ECDSA),
* behave as if the client had sent value {sha1,ecdsa}.
*/
if (this.supportedSignatureAlgorithms == null)
{
switch (keyExchange)
{
case KeyExchangeAlgorithm.DH_DSS:
case KeyExchangeAlgorithm.DHE_DSS:
case KeyExchangeAlgorithm.SRP_DSS:
{
this.supportedSignatureAlgorithms = TlsUtils.getDefaultDSSSignatureAlgorithms();
break;
}
case KeyExchangeAlgorithm.ECDH_ECDSA:
case KeyExchangeAlgorithm.ECDHE_ECDSA:
{
this.supportedSignatureAlgorithms = TlsUtils.getDefaultECDSASignatureAlgorithms();
break;
}
case KeyExchangeAlgorithm.DH_RSA:
case KeyExchangeAlgorithm.DHE_RSA:
case KeyExchangeAlgorithm.ECDH_RSA:
case KeyExchangeAlgorithm.ECDHE_RSA:
case KeyExchangeAlgorithm.RSA:
case KeyExchangeAlgorithm.RSA_PSK:
case KeyExchangeAlgorithm.SRP_RSA:
{
this.supportedSignatureAlgorithms = TlsUtils.getDefaultRSASignatureAlgorithms();
break;
}
case KeyExchangeAlgorithm.DHE_PSK:
case KeyExchangeAlgorithm.ECDHE_PSK:
case KeyExchangeAlgorithm.PSK:
case KeyExchangeAlgorithm.SRP:
break;
default:
throw new IllegalStateException("unsupported key exchange algorithm");
}
}
}
else if (this.supportedSignatureAlgorithms != null)
{
throw new IllegalStateException("supported_signature_algorithms not allowed for " + clientVersion);
}
}
public void processServerCertificate(Certificate serverCertificate)
throws IOException
{
if (supportedSignatureAlgorithms == null)
{
/*
* TODO RFC 2264 7.4.2. Unless otherwise specified, the signing algorithm for the
* certificate must be the same as the algorithm for the certificate key.
*/
}
else
{
/*
* TODO RFC 5264 7.4.2. If the client provided a "signature_algorithms" extension, then
* all certificates provided by the server MUST be signed by a hash/signature algorithm
* pair that appears in that extension.
*/
}
}
public void processServerCredentials(TlsCredentials serverCredentials)
throws IOException
{
processServerCertificate(serverCredentials.getCertificate());
}
public boolean requiresServerKeyExchange()
{
return false;
}
public byte[] generateServerKeyExchange()
throws IOException
{
if (requiresServerKeyExchange())
{
throw new TlsFatalAlert(AlertDescription.internal_error);
}
return null;
}
public void skipServerKeyExchange()
throws IOException
{
if (requiresServerKeyExchange())
{
throw new TlsFatalAlert(AlertDescription.unexpected_message);
}
}
public void processServerKeyExchange(InputStream input)
throws IOException
{
if (!requiresServerKeyExchange())
{
throw new TlsFatalAlert(AlertDescription.unexpected_message);
}
}
public void skipClientCredentials()
throws IOException
{
}
public void processClientCertificate(Certificate clientCertificate)
throws IOException
{
}
public void processClientKeyExchange(InputStream input)
throws IOException
{
// Key exchange implementation MUST support client key exchange
throw new TlsFatalAlert(AlertDescription.internal_error);
}
}
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