--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/share/classes/sun/security/ssl/SSLSecretDerivation.java Mon Jun 25 13:41:39 2018 -0700
@@ -0,0 +1,152 @@
+/*
+ * Copyright (c) 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
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package sun.security.ssl;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.security.GeneralSecurityException;
+import java.security.spec.AlgorithmParameterSpec;
+import javax.crypto.SecretKey;
+import javax.net.ssl.SSLHandshakeException;
+import sun.security.ssl.CipherSuite.HashAlg;
+
+final class SSLSecretDerivation implements SSLKeyDerivation {
+ private static final byte[] sha256EmptyDigest = new byte[] {
+ (byte)0xE3, (byte)0xB0, (byte)0xC4, (byte)0x42,
+ (byte)0x98, (byte)0xFC, (byte)0x1C, (byte)0x14,
+ (byte)0x9A, (byte)0xFB, (byte)0xF4, (byte)0xC8,
+ (byte)0x99, (byte)0x6F, (byte)0xB9, (byte)0x24,
+ (byte)0x27, (byte)0xAE, (byte)0x41, (byte)0xE4,
+ (byte)0x64, (byte)0x9B, (byte)0x93, (byte)0x4C,
+ (byte)0xA4, (byte)0x95, (byte)0x99, (byte)0x1B,
+ (byte)0x78, (byte)0x52, (byte)0xB8, (byte)0x55
+ };
+
+ private static final byte[] sha384EmptyDigest = new byte[] {
+ (byte)0x38, (byte)0xB0, (byte)0x60, (byte)0xA7,
+ (byte)0x51, (byte)0xAC, (byte)0x96, (byte)0x38,
+ (byte)0x4C, (byte)0xD9, (byte)0x32, (byte)0x7E,
+ (byte)0xB1, (byte)0xB1, (byte)0xE3, (byte)0x6A,
+ (byte)0x21, (byte)0xFD, (byte)0xB7, (byte)0x11,
+ (byte)0x14, (byte)0xBE, (byte)0x07, (byte)0x43,
+ (byte)0x4C, (byte)0x0C, (byte)0xC7, (byte)0xBF,
+ (byte)0x63, (byte)0xF6, (byte)0xE1, (byte)0xDA,
+ (byte)0x27, (byte)0x4E, (byte)0xDE, (byte)0xBF,
+ (byte)0xE7, (byte)0x6F, (byte)0x65, (byte)0xFB,
+ (byte)0xD5, (byte)0x1A, (byte)0xD2, (byte)0xF1,
+ (byte)0x48, (byte)0x98, (byte)0xB9, (byte)0x5B
+ };
+
+ private final HandshakeContext context;
+ private final String hkdfAlg;
+ private final HashAlg hashAlg;
+ private final SecretKey secret;
+ private final byte[] transcriptHash; // handshake messages transcript hash
+
+ SSLSecretDerivation(
+ HandshakeContext context, SecretKey secret) {
+ this.context = context;
+ this.secret = secret;
+ this.hashAlg = context.negotiatedCipherSuite.hashAlg;
+ this.hkdfAlg =
+ "HKDF-Expand/Hmac" + hashAlg.name.replace("-", "");
+ context.handshakeHash.update();
+ this.transcriptHash = context.handshakeHash.digest();
+ }
+
+ SSLSecretDerivation forContext(HandshakeContext context) {
+ return new SSLSecretDerivation(context, secret);
+ }
+
+ @Override
+ public SecretKey deriveKey(String algorithm,
+ AlgorithmParameterSpec params) throws IOException {
+ SecretSchedule ks = SecretSchedule.valueOf(algorithm);
+ try {
+ byte[] expandContext;
+ if (ks == SecretSchedule.TlsSaltSecret) {
+ if (hashAlg == HashAlg.H_SHA256) {
+ expandContext = sha256EmptyDigest;
+ } else if (hashAlg == HashAlg.H_SHA384) {
+ expandContext = sha384EmptyDigest;
+ } else {
+ // unlikely, but please update if more hash algorithm
+ // get supported in the future.
+ throw new SSLHandshakeException(
+ "Unexpected unsupported hash algorithm: " +
+ algorithm);
+ }
+ } else {
+ expandContext = transcriptHash;
+ }
+ byte[] hkdfInfo = createHkdfInfo(ks.label,
+ expandContext, hashAlg.hashLength);
+
+ HKDF hkdf = new HKDF(hashAlg.name);
+ return hkdf.expand(secret, hkdfInfo, hashAlg.hashLength, algorithm);
+ } catch (GeneralSecurityException gse) {
+ throw (SSLHandshakeException) new SSLHandshakeException(
+ "Could not generate secret").initCause(gse);
+ }
+ }
+
+ public 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
+ throw new RuntimeException("Unexpected exception", ioe);
+ }
+
+ return info;
+ }
+
+ private enum SecretSchedule {
+ // Note that we use enum name as the key/secret name.
+ TlsSaltSecret ("derived"),
+ TlsExtBinderKey ("ext binder"),
+ TlsResBinderKey ("res binder"),
+ TlsClientEarlyTrafficSecret ("c e traffic"),
+ TlsEarlyExporterMasterSecret ("e exp master"),
+ TlsClientHandshakeTrafficSecret ("c hs traffic"),
+ TlsServerHandshakeTrafficSecret ("s hs traffic"),
+ TlsClientAppTrafficSecret ("c ap traffic"),
+ TlsServerAppTrafficSecret ("s ap traffic"),
+ TlsExporterMasterSecret ("exp master"),
+ TlsResumptionMasterSecret ("res master");
+
+ private final byte[] label;
+
+ private SecretSchedule(String label) {
+ this.label = ("tls13 " + label).getBytes();
+ }
+ }
+}