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/*
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* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.security.ssl;
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import javax.crypto.KeyAgreement;
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import javax.crypto.SecretKey;
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import javax.crypto.spec.SecretKeySpec;
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import javax.net.ssl.SSLHandshakeException;
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import java.io.IOException;
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import java.security.GeneralSecurityException;
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import java.security.PrivateKey;
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import java.security.PublicKey;
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import java.security.spec.AlgorithmParameterSpec;
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public class KAKeyDerivation implements SSLKeyDerivation {
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private final String algorithmName;
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private final HandshakeContext context;
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private final PrivateKey localPrivateKey;
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private final PublicKey peerPublicKey;
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KAKeyDerivation(String algorithmName,
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HandshakeContext context,
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PrivateKey localPrivateKey,
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PublicKey peerPublicKey) {
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this.algorithmName = algorithmName;
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this.context = context;
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this.localPrivateKey = localPrivateKey;
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this.peerPublicKey = peerPublicKey;
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}
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@Override
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public SecretKey deriveKey(String algorithm,
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AlgorithmParameterSpec params) throws IOException {
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if (!context.negotiatedProtocol.useTLS13PlusSpec()) {
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return t12DeriveKey(algorithm, params);
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} else {
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return t13DeriveKey(algorithm, params);
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}
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}
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private SecretKey t12DeriveKey(String algorithm,
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AlgorithmParameterSpec params) throws IOException {
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try {
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KeyAgreement ka = JsseJce.getKeyAgreement(algorithmName);
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ka.init(localPrivateKey);
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ka.doPhase(peerPublicKey, true);
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SecretKey preMasterSecret =
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ka.generateSecret("TlsPremasterSecret");
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SSLMasterKeyDerivation mskd =
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SSLMasterKeyDerivation.valueOf(
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context.negotiatedProtocol);
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if (mskd == null) {
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// unlikely
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throw new SSLHandshakeException(
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"No expected master key derivation for protocol: " +
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context.negotiatedProtocol.name);
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}
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SSLKeyDerivation kd = mskd.createKeyDerivation(
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context, preMasterSecret);
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return kd.deriveKey("MasterSecret", params);
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} catch (GeneralSecurityException gse) {
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throw (SSLHandshakeException) new SSLHandshakeException(
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"Could not generate secret").initCause(gse);
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}
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}
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private SecretKey t13DeriveKey(String algorithm,
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AlgorithmParameterSpec params) throws IOException {
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try {
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KeyAgreement ka = JsseJce.getKeyAgreement(algorithmName);
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ka.init(localPrivateKey);
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ka.doPhase(peerPublicKey, true);
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SecretKey sharedSecret =
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ka.generateSecret("TlsPremasterSecret");
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CipherSuite.HashAlg hashAlg = context.negotiatedCipherSuite.hashAlg;
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SSLKeyDerivation kd = context.handshakeKeyDerivation;
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HKDF hkdf = new HKDF(hashAlg.name);
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if (kd == null) { // No PSK is in use.
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// If PSK is not in use Early Secret will still be
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// HKDF-Extract(0, 0).
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byte[] zeros = new byte[hashAlg.hashLength];
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SecretKeySpec ikm =
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new SecretKeySpec(zeros, "TlsPreSharedSecret");
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SecretKey earlySecret =
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hkdf.extract(zeros, ikm, "TlsEarlySecret");
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kd = new SSLSecretDerivation(context, earlySecret);
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}
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// derive salt secret
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SecretKey saltSecret = kd.deriveKey("TlsSaltSecret", null);
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// derive handshake secret
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return hkdf.extract(saltSecret, sharedSecret, algorithm);
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} catch (GeneralSecurityException gse) {
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throw (SSLHandshakeException) new SSLHandshakeException(
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"Could not generate secret").initCause(gse);
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}
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}
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} |