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package org.bouncycastle.crypto.tls;
import java.io.IOException;
import java.util.Hashtable;
import org.bouncycastle.util.Arrays;
public class SRPTlsClient
extends AbstractTlsClient
{
protected TlsSRPGroupVerifier groupVerifier;
protected byte[] identity;
protected byte[] password;
public SRPTlsClient(byte[] identity, byte[] password)
{
this(new DefaultTlsCipherFactory(), new DefaultTlsSRPGroupVerifier(), identity, password);
}
public SRPTlsClient(TlsCipherFactory cipherFactory, byte[] identity, byte[] password)
{
this(cipherFactory, new DefaultTlsSRPGroupVerifier(), identity, password);
}
public SRPTlsClient(TlsCipherFactory cipherFactory, TlsSRPGroupVerifier groupVerifier,
byte[] identity, byte[] password)
{
super(cipherFactory);
this.groupVerifier = groupVerifier;
this.identity = Arrays.clone(identity);
this.password = Arrays.clone(password);
}
protected boolean requireSRPServerExtension()
{
// No explicit guidance in RFC 5054; by default an (empty) extension from server is optional
return false;
}
public int[] getCipherSuites()
{
return new int[]
{
CipherSuite.TLS_SRP_SHA_RSA_WITH_AES_128_CBC_SHA
};
}
public Hashtable getClientExtensions()
throws IOException
{
Hashtable clientExtensions = TlsExtensionsUtils.ensureExtensionsInitialised(super.getClientExtensions());
TlsSRPUtils.addSRPExtension(clientExtensions, this.identity);
return clientExtensions;
}
public void processServerExtensions(Hashtable serverExtensions)
throws IOException
{
if (!TlsUtils.hasExpectedEmptyExtensionData(serverExtensions, TlsSRPUtils.EXT_SRP,
AlertDescription.illegal_parameter))
{
if (requireSRPServerExtension())
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
}
super.processServerExtensions(serverExtensions);
}
public TlsKeyExchange getKeyExchange()
throws IOException
{
switch (selectedCipherSuite)
{
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 createSRPKeyExchange(KeyExchangeAlgorithm.SRP);
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:
return createSRPKeyExchange(KeyExchangeAlgorithm.SRP_RSA);
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:
return createSRPKeyExchange(KeyExchangeAlgorithm.SRP_DSS);
default:
/*
* Note: internal error here; the TlsProtocol implementation verifies that the
* server-selected cipher suite was in the list of client-offered cipher suites, so if
* we now can't produce an implementation, we shouldn't have offered it!
*/
throw new TlsFatalAlert(AlertDescription.internal_error);
}
}
public TlsAuthentication getAuthentication() throws IOException
{
/*
* Note: This method is not called unless a server certificate is sent, which may be the
* case e.g. for SRP_DSS or SRP_RSA key exchange.
*/
throw new TlsFatalAlert(AlertDescription.internal_error);
}
public TlsCipher getCipher()
throws IOException
{
switch (selectedCipherSuite)
{
case CipherSuite.TLS_SRP_SHA_WITH_3DES_EDE_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_RSA_WITH_3DES_EDE_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_DSS_WITH_3DES_EDE_CBC_SHA:
return cipherFactory.createCipher(context, EncryptionAlgorithm._3DES_EDE_CBC, MACAlgorithm.hmac_sha1);
case CipherSuite.TLS_SRP_SHA_WITH_AES_128_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_RSA_WITH_AES_128_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_DSS_WITH_AES_128_CBC_SHA:
return cipherFactory.createCipher(context, EncryptionAlgorithm.AES_128_CBC, MACAlgorithm.hmac_sha1);
case CipherSuite.TLS_SRP_SHA_WITH_AES_256_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_RSA_WITH_AES_256_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_DSS_WITH_AES_256_CBC_SHA:
return cipherFactory.createCipher(context, EncryptionAlgorithm.AES_256_CBC, MACAlgorithm.hmac_sha1);
default:
/*
* Note: internal error here; the TlsProtocol implementation verifies that the
* server-selected cipher suite was in the list of client-offered cipher suites, so if
* we now can't produce an implementation, we shouldn't have offered it!
*/
throw new TlsFatalAlert(AlertDescription.internal_error);
}
}
protected TlsKeyExchange createSRPKeyExchange(int keyExchange)
{
return new TlsSRPKeyExchange(keyExchange, supportedSignatureAlgorithms, groupVerifier, identity, password);
}
}
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