src/java.base/share/classes/sun/security/ssl/SSLBasicKeyDerivation.java - master - githubmirror/riscv-port

src/java.base/share/classes/sun/security/ssl/SSLBasicKeyDerivation.java

76 строк3 KB

Valerie Peng

8353578: Refactor existing usage of internal HKDF impl to use the KDF API

14 май 2025, 01:43

14 май 2025, 01:434c0a0ab

/*
 * Copyright (c) 2018, 2025, 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 sun.security.ssl;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.security.GeneralSecurityException;
import javax.crypto.KDF;
import javax.crypto.SecretKey;
import javax.crypto.spec.HKDFParameterSpec;
import javax.net.ssl.SSLHandshakeException;

import sun.security.ssl.CipherSuite.HashAlg;

final class SSLBasicKeyDerivation implements SSLKeyDerivation {
    private final String hkdfAlg;
    private final SecretKey secret;
    private final byte[] hkdfInfo;
    private final int keyLen;

    SSLBasicKeyDerivation(SecretKey secret, HashAlg hashAlg, byte[] label,
            byte[] context) {
        this.hkdfAlg = hashAlg.hkdfAlgorithm;
        this.secret = secret;
        this.hkdfInfo = createHkdfInfo(label, context, hashAlg.hashLength);
        this.keyLen = hashAlg.hashLength;
    }

    @Override
    public SecretKey deriveKey(String type) throws IOException {
        try {
            KDF hkdf = KDF.getInstance(hkdfAlg);
            return hkdf.deriveKey(type,
                    HKDFParameterSpec.expandOnly(secret, hkdfInfo, keyLen));
        } catch (GeneralSecurityException gse) {
            throw new SSLHandshakeException("Could not generate secret", gse);
        }
    }

    private static byte[] createHkdfInfo(
            byte[] label, byte[] context, int length) {
        byte[] info = new byte[4 + label.length + context.length];
        ByteBuffer m = ByteBuffer.wrap(info);
        try {
            Record.putInt16(m, length);
            Record.putBytes8(m, label);
            Record.putBytes8(m, context);
        } catch (IOException ioe) {
            // unlikely
        }
        return info;
    }
}