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package org.bouncycastle.crypto.tls;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Hashtable;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.Integers;
public abstract class SRPTlsClient extends AbstractTlsClient {
public static final Integer EXT_SRP = Integers.valueOf(ExtensionType.srp);
protected byte[] identity;
protected byte[] password;
public SRPTlsClient(byte[] identity, byte[] password) {
super();
this.identity = Arrays.clone(identity);
this.password = Arrays.clone(password);
}
public SRPTlsClient(TlsCipherFactory cipherFactory, byte[] identity, byte[] password) {
super(cipherFactory);
this.identity = Arrays.clone(identity);
this.password = Arrays.clone(password);
}
public int[] getCipherSuites() {
return new int[] { CipherSuite.TLS_SRP_SHA_RSA_WITH_AES_256_CBC_SHA,
CipherSuite.TLS_SRP_SHA_RSA_WITH_AES_128_CBC_SHA, CipherSuite.TLS_SRP_SHA_RSA_WITH_3DES_EDE_CBC_SHA,
CipherSuite.TLS_SRP_SHA_WITH_AES_256_CBC_SHA, CipherSuite.TLS_SRP_SHA_WITH_AES_128_CBC_SHA,
CipherSuite.TLS_SRP_SHA_WITH_3DES_EDE_CBC_SHA, };
}
public Hashtable getClientExtensions() throws IOException {
Hashtable clientExtensions = super.getClientExtensions();
if (clientExtensions == null) {
clientExtensions = new Hashtable();
}
ByteArrayOutputStream srpData = new ByteArrayOutputStream();
TlsUtils.writeOpaque8(this.identity, srpData);
clientExtensions.put(EXT_SRP, srpData.toByteArray());
return clientExtensions;
}
public void processServerExtensions(Hashtable serverExtensions) throws IOException {
// No explicit guidance in RFC 5054 here; we allow an optional empty extension from server
if (serverExtensions != null) {
byte[] extValue = (byte[]) serverExtensions.get(EXT_SRP);
if (extValue != null && extValue.length > 0) {
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
}
}
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 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, identity, password);
}
}
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