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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

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package sun.security.pkcs11;

import java.security.*;

import java.security.spec.AlgorithmParameterSpec;

import javax.crypto.*;

import javax.crypto.spec.*;

import sun.security.internal.spec.TlsRsaPremasterSecretParameterSpec;

import static sun.security.pkcs11.TemplateManager.*;

import sun.security.pkcs11.wrapper.*;

import static sun.security.pkcs11.wrapper.PKCS11Constants.*;

/**

 * KeyGenerator for the SSL/TLS RSA premaster secret.

 *

 * @author  Andreas Sterbenz

 * @since   1.6

 */

final class P11TlsRsaPremasterSecretGenerator extends KeyGeneratorSpi {

    private final static String MSG = "TlsRsaPremasterSecretGenerator must be "

        + "initialized using a TlsRsaPremasterSecretParameterSpec";

    // token instance

    private final Token token;

    // algorithm name

    private final String algorithm;

    // mechanism id

    private long mechanism;

    private int version;

    private TlsRsaPremasterSecretParameterSpec spec;

    P11TlsRsaPremasterSecretGenerator(Token token, String algorithm, long mechanism)

            throws PKCS11Exception {

        super();

        this.token = token;

        this.algorithm = algorithm;

        this.mechanism = mechanism;

    }

    protected void engineInit(SecureRandom random) {

        throw new InvalidParameterException(MSG);

    }

    protected void engineInit(AlgorithmParameterSpec params,

            SecureRandom random) throws InvalidAlgorithmParameterException {

        if (!(params instanceof TlsRsaPremasterSecretParameterSpec)) {

            throw new InvalidAlgorithmParameterException(MSG);

        }

        this.spec = (TlsRsaPremasterSecretParameterSpec)params;

        version = (spec.getMajorVersion() << 8) | spec.getMinorVersion();

        if ((version < 0x0300) && (version > 0x0303)) {

            throw new InvalidAlgorithmParameterException

                ("Only SSL 3.0, TLS 1.0, TLS 1.1, and TLS 1.2 are supported");

        }

    }

    protected void engineInit(int keysize, SecureRandom random) {

        throw new InvalidParameterException(MSG);

    }

    // Only can be used in client side to generate TLS RSA premaster secret.

    protected SecretKey engineGenerateKey() {

        if (spec == null) {

            throw new IllegalStateException

                        ("TlsRsaPremasterSecretGenerator must be initialized");

        }

        CK_VERSION version = new CK_VERSION(

                        spec.getMajorVersion(), spec.getMinorVersion());

        Session session = null;

        try {

            session = token.getObjSession();

            CK_ATTRIBUTE[] attributes = token.getAttributes(

                    O_GENERATE, CKO_SECRET_KEY,

                    CKK_GENERIC_SECRET, new CK_ATTRIBUTE[0]);

            long keyID = token.p11.C_GenerateKey(session.id(),

                    new CK_MECHANISM(mechanism, version), attributes);

            SecretKey key = P11Key.secretKey(session,

                    keyID, "TlsRsaPremasterSecret", 48 << 3, attributes);

            return key;

        } catch (PKCS11Exception e) {

            throw new ProviderException(

                    "Could not generate premaster secret", e);

        } finally {

            token.releaseSession(session);

        }

    }

}