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Tweaked port of SunPKCS11 security provider
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/*
 * Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * 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,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package com.github.kwart.jsign.pkcs11;

import java.security.*;
import java.security.spec.AlgorithmParameterSpec;

import javax.crypto.*;
import javax.crypto.spec.*;

import sun.security.internal.spec.TlsRsaPremasterSecretParameterSpec;
import sun.security.pkcs11.wrapper.*;

import static com.github.kwart.jsign.pkcs11.TemplateManager.*;
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);
        }
    }

}