org.bouncycastle.tls.TlsDHEKeyExchange Maven / Gradle / Ivy

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The Bouncy Castle Java APIs for the TLS, including a JSSE provider. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.tls;

import java.io.IOException;
import java.io.InputStream;
import java.util.Vector;

import org.bouncycastle.tls.crypto.TlsDHConfig;
import org.bouncycastle.tls.crypto.TlsVerifier;
import org.bouncycastle.util.io.TeeInputStream;

public class TlsDHEKeyExchange
    extends TlsDHKeyExchange
{
    private static int checkKeyExchange(int keyExchange)
    {
        switch (keyExchange)
        {
        case KeyExchangeAlgorithm.DHE_DSS:
        case KeyExchangeAlgorithm.DHE_RSA:
            return keyExchange;
        default:
            throw new IllegalArgumentException("unsupported key exchange algorithm");
        }
    }

    protected TlsCredentialedSigner serverCredentials = null;
    protected TlsVerifier verifier = null;

    public TlsDHEKeyExchange(int keyExchange, Vector supportedSignatureAlgorithms, TlsDHConfigVerifier dhConfigVerifier)
    {
        super(checkKeyExchange(keyExchange), supportedSignatureAlgorithms, dhConfigVerifier);
    }

    public TlsDHEKeyExchange(int keyExchange, Vector supportedSignatureAlgorithms, TlsDHConfig dhConfig)
    {
        super(checkKeyExchange(keyExchange), supportedSignatureAlgorithms, dhConfig);
    }

    public void processServerCredentials(TlsCredentials serverCredentials) throws IOException
    {
        if (!(serverCredentials instanceof TlsCredentialedSigner))
        {
            throw new TlsFatalAlert(AlertDescription.internal_error);
        }

        this.serverCredentials = (TlsCredentialedSigner)serverCredentials;
    }

    public void processServerCertificate(Certificate serverCertificate) throws IOException
    {
        if (serverCertificate.isEmpty())
        {
            throw new TlsFatalAlert(AlertDescription.bad_certificate);
        }

        checkServerCertSigAlg(serverCertificate);

        this.verifier = serverCertificate.getCertificateAt(0)
            .createVerifier(TlsUtils.getSignatureAlgorithm(keyExchange));
    }

    public byte[] generateServerKeyExchange() throws IOException
    {
        if (this.dhConfig == null)
        {
            throw new TlsFatalAlert(AlertDescription.internal_error);
        }

        DigestInputBuffer buf = new DigestInputBuffer();

        TlsDHUtils.writeDHConfig(dhConfig, buf);

        this.agreement = context.getCrypto().createDHDomain(dhConfig).createDH();

        generateEphemeral(buf);

        DigitallySigned signedParams = TlsUtils.generateServerKeyExchangeSignature(context, serverCredentials, buf);

        signedParams.encode(buf);

        return buf.toByteArray();
    }

    public void processServerKeyExchange(InputStream input) throws IOException
    {
        DigestInputBuffer buf = new DigestInputBuffer();
        InputStream teeIn = new TeeInputStream(input, buf);

        this.dhConfig = TlsDHUtils.receiveDHConfig(dhConfigVerifier, teeIn);

        byte[] y = TlsUtils.readOpaque16(teeIn);

        DigitallySigned signedParams = parseSignature(input);

        TlsUtils.verifyServerKeyExchangeSignature(context, verifier, buf, signedParams);

        this.agreement = context.getCrypto().createDHDomain(dhConfig).createDH();

        processEphemeral(y);
    }

    public short[] getClientCertificateTypes()
    {
        return new short[]{ ClientCertificateType.dss_sign, ClientCertificateType.ecdsa_sign,
            ClientCertificateType.rsa_sign };
    }

    public void processClientCredentials(TlsCredentials clientCredentials) throws IOException
    {
        if (clientCredentials instanceof TlsCredentialedSigner)
        {
            // OK
        }
        else
        {
            throw new TlsFatalAlert(AlertDescription.internal_error);
        }
    }
}