org.bouncycastle.tls.TlsRSAKeyExchange 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.io.OutputStream;

import org.bouncycastle.tls.crypto.TlsCertificateRole;
import org.bouncycastle.tls.crypto.TlsCryptoParameters;
import org.bouncycastle.tls.crypto.TlsEncryptor;
import org.bouncycastle.tls.crypto.TlsSecret;

/**
 * (D)TLS RSA key exchange.
 */
public class TlsRSAKeyExchange
    extends AbstractTlsKeyExchange
{
    private static int checkKeyExchange(int keyExchange)
    {
        switch (keyExchange)
        {
        case KeyExchangeAlgorithm.RSA:
            return keyExchange;
        default:
            throw new IllegalArgumentException("unsupported key exchange algorithm");
        }
    }

    protected TlsCredentialedDecryptor serverCredentials = null;
    protected TlsEncryptor serverEncryptor;
    protected TlsSecret preMasterSecret;

    public TlsRSAKeyExchange(int keyExchange)
    {
        super(checkKeyExchange(keyExchange));
    }

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

    public void processServerCredentials(TlsCredentials serverCredentials)
        throws IOException
    {
        this.serverCredentials = TlsUtils.requireDecryptorCredentials(serverCredentials);
    }

    public void processServerCertificate(Certificate serverCertificate)
        throws IOException
    {
        this.serverEncryptor = serverCertificate.getCertificateAt(0).createEncryptor(
            TlsCertificateRole.RSA_ENCRYPTION);
    }

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

    public void processClientCredentials(TlsCredentials clientCredentials)
        throws IOException
    {
        TlsUtils.requireSignerCredentials(clientCredentials);
    }

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

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

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

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