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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.
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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);
    }
}