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

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bctls-fips Show documentation

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.

There is a newer version: 2.0.19

Show newest version

package org.bouncycastle.tls;

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

import org.bouncycastle.tls.crypto.TlsCertificate;
import org.bouncycastle.tls.crypto.TlsCryptoParameters;
import org.bouncycastle.tls.crypto.TlsSecret;

/**
 * (D)TLS RSA key exchange.
 */
public class TlsRSAKeyExchange
    extends AbstractTlsKeyExchange
{
    protected TlsCredentialedDecryptor serverCredentials = null;
    protected TlsCertificate serverCertificate;
    protected TlsSecret preMasterSecret;

    public TlsRSAKeyExchange(Vector supportedSignatureAlgorithms)
    {
        super(KeyExchangeAlgorithm.RSA, supportedSignatureAlgorithms);
    }

    public void skipServerCredentials()
        throws IOException
    {
        throw new TlsFatalAlert(AlertDescription.internal_error);
    }

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

        this.serverCredentials = (TlsCredentialedDecryptor)serverCredentials;
    }

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

        checkServerCertSigAlg(serverCertificate);

        this.serverCertificate = serverCertificate.getCertificateAt(0).useInRole(ConnectionEnd.server, keyExchange);
    }

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

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

    public void generateClientKeyExchange(OutputStream output)
        throws IOException
    {
        this.preMasterSecret = TlsRSAUtils.generateEncryptedPreMasterSecret(context, serverCertificate, output);
    }

    public void processClientKeyExchange(InputStream input)
        throws IOException
    {
        byte[] encryptedPreMasterSecret = TlsUtils.readOpaque16(input);

        this.preMasterSecret = serverCredentials.decrypt(new TlsCryptoParameters(context), encryptedPreMasterSecret);
    }

    public TlsSecret generatePreMasterSecret()
        throws IOException
    {
        TlsSecret tmp = this.preMasterSecret;
        this.preMasterSecret = null;
        return tmp;
    }
}