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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.4. Note: this package includes the NTRU encryption algorithms.
package org.bouncycastle.crypto.tls;
import java.io.IOException;
import java.util.Hashtable;
import java.util.Vector;
public abstract class AbstractTlsClient
extends AbstractTlsPeer
implements TlsClient
{
protected TlsCipherFactory cipherFactory;
protected TlsClientContext context;
protected Vector supportedSignatureAlgorithms;
protected int[] namedCurves;
protected short[] clientECPointFormats, serverECPointFormats;
protected int selectedCipherSuite;
protected short selectedCompressionMethod;
public AbstractTlsClient()
{
this(new DefaultTlsCipherFactory());
}
public AbstractTlsClient(TlsCipherFactory cipherFactory)
{
this.cipherFactory = cipherFactory;
}
public void init(TlsClientContext context)
{
this.context = context;
}
public TlsSession getSessionToResume()
{
return null;
}
/**
* RFC 5246 E.1. "TLS clients that wish to negotiate with older servers MAY send any value
* {03,XX} as the record layer version number. Typical values would be {03,00}, the lowest
* version number supported by the client, and the value of ClientHello.client_version. No
* single value will guarantee interoperability with all old servers, but this is a complex
* topic beyond the scope of this document."
*/
public ProtocolVersion getClientHelloRecordLayerVersion()
{
// "{03,00}"
// return ProtocolVersion.SSLv3;
// "the lowest version number supported by the client"
// return getMinimumVersion();
// "the value of ClientHello.client_version"
return getClientVersion();
}
public ProtocolVersion getClientVersion()
{
return ProtocolVersion.TLSv12;
}
public Hashtable getClientExtensions()
throws IOException
{
Hashtable clientExtensions = null;
ProtocolVersion clientVersion = context.getClientVersion();
/*
* RFC 5246 7.4.1.4.1. Note: this extension is not meaningful for TLS versions prior to 1.2.
* Clients MUST NOT offer it if they are offering prior versions.
*/
if (TlsUtils.isSignatureAlgorithmsExtensionAllowed(clientVersion))
{
// TODO Provide a way for the user to specify the acceptable hash/signature algorithms.
short[] hashAlgorithms = new short[]{ HashAlgorithm.sha512, HashAlgorithm.sha384, HashAlgorithm.sha256,
HashAlgorithm.sha224, HashAlgorithm.sha1 };
// TODO Sort out ECDSA signatures and add them as the preferred option here
short[] signatureAlgorithms = new short[]{ SignatureAlgorithm.rsa };
this.supportedSignatureAlgorithms = new Vector();
for (int i = 0; i < hashAlgorithms.length; ++i)
{
for (int j = 0; j < signatureAlgorithms.length; ++j)
{
this.supportedSignatureAlgorithms.addElement(new SignatureAndHashAlgorithm(hashAlgorithms[i],
signatureAlgorithms[j]));
}
}
/*
* RFC 5264 7.4.3. Currently, DSA [DSS] may only be used with SHA-1.
*/
this.supportedSignatureAlgorithms.addElement(new SignatureAndHashAlgorithm(HashAlgorithm.sha1,
SignatureAlgorithm.dsa));
clientExtensions = TlsExtensionsUtils.ensureExtensionsInitialised(clientExtensions);
TlsUtils.addSignatureAlgorithmsExtension(clientExtensions, supportedSignatureAlgorithms);
}
if (TlsECCUtils.containsECCCipherSuites(getCipherSuites()))
{
/*
* RFC 4492 5.1. A client that proposes ECC cipher suites in its ClientHello message
* appends these extensions (along with any others), enumerating the curves it supports
* and the point formats it can parse. Clients SHOULD send both the Supported Elliptic
* Curves Extension and the Supported Point Formats Extension.
*/
/*
* TODO Could just add all the curves since we support them all, but users may not want
* to use unnecessarily large fields. Need configuration options.
*/
this.namedCurves = new int[]{ NamedCurve.secp256r1, NamedCurve.secp384r1 };
this.clientECPointFormats = new short[]{ ECPointFormat.uncompressed,
ECPointFormat.ansiX962_compressed_prime, ECPointFormat.ansiX962_compressed_char2, };
clientExtensions = TlsExtensionsUtils.ensureExtensionsInitialised(clientExtensions);
TlsECCUtils.addSupportedEllipticCurvesExtension(clientExtensions, namedCurves);
TlsECCUtils.addSupportedPointFormatsExtension(clientExtensions, clientECPointFormats);
}
return clientExtensions;
}
public ProtocolVersion getMinimumVersion()
{
return ProtocolVersion.TLSv10;
}
public void notifyServerVersion(ProtocolVersion serverVersion)
throws IOException
{
if (!getMinimumVersion().isEqualOrEarlierVersionOf(serverVersion))
{
throw new TlsFatalAlert(AlertDescription.protocol_version);
}
}
public short[] getCompressionMethods()
{
return new short[]{CompressionMethod._null};
}
public void notifySessionID(byte[] sessionID)
{
// Currently ignored
}
public void notifySelectedCipherSuite(int selectedCipherSuite)
{
this.selectedCipherSuite = selectedCipherSuite;
}
public void notifySelectedCompressionMethod(short selectedCompressionMethod)
{
this.selectedCompressionMethod = selectedCompressionMethod;
}
public void processServerExtensions(Hashtable serverExtensions)
throws IOException
{
/*
* TlsProtocol implementation validates that any server extensions received correspond to
* client extensions sent. By default, we don't send any, and this method is not called.
*/
if (serverExtensions != null)
{
/*
* RFC 5246 7.4.1.4.1. Servers MUST NOT send this extension.
*/
if (serverExtensions.containsKey(TlsUtils.EXT_signature_algorithms))
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
int[] namedCurves = TlsECCUtils.getSupportedEllipticCurvesExtension(serverExtensions);
if (namedCurves != null)
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
this.serverECPointFormats = TlsECCUtils.getSupportedPointFormatsExtension(serverExtensions);
if (this.serverECPointFormats != null && !TlsECCUtils.isECCCipherSuite(this.selectedCipherSuite))
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
}
}
public void processServerSupplementalData(Vector serverSupplementalData)
throws IOException
{
if (serverSupplementalData != null)
{
throw new TlsFatalAlert(AlertDescription.unexpected_message);
}
}
public Vector getClientSupplementalData()
throws IOException
{
return null;
}
public TlsCompression getCompression()
throws IOException
{
switch (selectedCompressionMethod)
{
case CompressionMethod._null:
return new TlsNullCompression();
default:
/*
* Note: internal error here; the TlsProtocol implementation verifies that the
* server-selected compression method was in the list of client-offered compression
* methods, so if we now can't produce an implementation, we shouldn't have offered it!
*/
throw new TlsFatalAlert(AlertDescription.internal_error);
}
}
public void notifyNewSessionTicket(NewSessionTicket newSessionTicket)
throws IOException
{
}
}