/*

 * Copyright (c) 2003, 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 sun.security.ssl;

import java.io.IOException;

import java.nio.ByteBuffer;

import java.security.AlgorithmConstraints;

import java.security.CryptoPrimitive;

import java.security.GeneralSecurityException;

import java.security.KeyFactory;

import java.security.PrivateKey;

import java.security.PublicKey;

import java.security.interfaces.ECPrivateKey;

import java.security.interfaces.ECPublicKey;

import java.security.spec.ECParameterSpec;

import java.security.spec.ECPoint;

import java.security.spec.ECPublicKeySpec;

import java.text.MessageFormat;

import java.util.EnumSet;

import java.util.Locale;

import javax.crypto.SecretKey;

import javax.net.ssl.SSLHandshakeException;

import sun.security.ssl.ECDHKeyExchange.ECDHECredentials;

import sun.security.ssl.ECDHKeyExchange.ECDHEPossession;

import sun.security.ssl.SSLHandshake.HandshakeMessage;

import sun.security.ssl.SupportedGroupsExtension.NamedGroup;

import sun.security.ssl.X509Authentication.X509Credentials;

import sun.security.ssl.X509Authentication.X509Possession;

import sun.security.util.HexDumpEncoder;

/**

 * Pack of the "ClientKeyExchange" handshake message.

 */

final class ECDHClientKeyExchange {

    static final SSLConsumer ecdhHandshakeConsumer =

            new ECDHClientKeyExchangeConsumer();

    static final HandshakeProducer ecdhHandshakeProducer =

            new ECDHClientKeyExchangeProducer();

    static final SSLConsumer ecdheHandshakeConsumer =

            new ECDHEClientKeyExchangeConsumer();

    static final HandshakeProducer ecdheHandshakeProducer =

            new ECDHEClientKeyExchangeProducer();

    /**

     * The ECDH/ECDHE ClientKeyExchange handshake message.

     */

    private static final

            class ECDHClientKeyExchangeMessage extends HandshakeMessage {

        private final byte[] encodedPoint;

        ECDHClientKeyExchangeMessage(HandshakeContext handshakeContext,

                ECPublicKey publicKey) {

            super(handshakeContext);

            ECPoint point = publicKey.getW();

            ECParameterSpec params = publicKey.getParams();

            encodedPoint = JsseJce.encodePoint(point, params.getCurve());

        }

        ECDHClientKeyExchangeMessage(HandshakeContext handshakeContext,

                ByteBuffer m) throws IOException {

            super(handshakeContext);

            if (m.remaining() != 0) {       // explicit PublicValueEncoding

                this.encodedPoint = Record.getBytes8(m);

            } else {

                this.encodedPoint = new byte[0];

            }

        }

        // Check constraints of the specified EC public key.

        static void checkConstraints(AlgorithmConstraints constraints,

                ECPublicKey publicKey,

                byte[] encodedPoint) throws SSLHandshakeException {

            try {

                ECParameterSpec params = publicKey.getParams();

                ECPoint point =

                        JsseJce.decodePoint(encodedPoint, params.getCurve());

                ECPublicKeySpec spec = new ECPublicKeySpec(point, params);

                KeyFactory kf = JsseJce.getKeyFactory("EC");

                ECPublicKey peerPublicKey =

                        (ECPublicKey)kf.generatePublic(spec);

                // check constraints of ECPublicKey

                if (!constraints.permits(

                        EnumSet.of(CryptoPrimitive.KEY_AGREEMENT),

                        peerPublicKey)) {

                    throw new SSLHandshakeException(

                        "ECPublicKey does not comply to algorithm constraints");

                }

            } catch (GeneralSecurityException | java.io.IOException e) {

                throw (SSLHandshakeException) new SSLHandshakeException(

                        "Could not generate ECPublicKey").initCause(e);

            }

        }

        @Override

        public SSLHandshake handshakeType() {

            return SSLHandshake.CLIENT_KEY_EXCHANGE;

        }

        @Override

        public int messageLength() {

            if (encodedPoint == null || encodedPoint.length == 0) {

                return 0;

            } else {

                return 1 + encodedPoint.length;

            }

        }

        @Override

        public void send(HandshakeOutStream hos) throws IOException {

            if (encodedPoint != null && encodedPoint.length != 0) {

                hos.putBytes8(encodedPoint);

            }

        }

        @Override

        public String toString() {

            MessageFormat messageFormat = new MessageFormat(

                "\"ECDH ClientKeyExchange\": '{'\n" +

                "  \"ecdh public\": '{'\n" +

                "{0}\n" +

                "  '}',\n" +

                "'}'",

                Locale.ENGLISH);

            if (encodedPoint == null || encodedPoint.length == 0) {

                Object[] messageFields = {

                    "    <implicit>"

                };

                return messageFormat.format(messageFields);

            } else {

                HexDumpEncoder hexEncoder = new HexDumpEncoder();

                Object[] messageFields = {

                    Utilities.indent(

                            hexEncoder.encodeBuffer(encodedPoint), "    "),

                };

                return messageFormat.format(messageFields);

            }

        }

    }

    /**

     * The ECDH "ClientKeyExchange" handshake message producer.

     */

    private static final

            class ECDHClientKeyExchangeProducer implements HandshakeProducer {

        // Prevent instantiation of this class.

        private ECDHClientKeyExchangeProducer() {

            // blank

        }

        @Override

        public byte[] produce(ConnectionContext context,

                HandshakeMessage message) throws IOException {

            // The producing happens in client side only.

            ClientHandshakeContext chc = (ClientHandshakeContext)context;

            X509Credentials x509Credentials = null;

            for (SSLCredentials credential : chc.handshakeCredentials) {

                if (credential instanceof X509Credentials) {

                    x509Credentials = (X509Credentials)credential;

                    break;

                }

            }

            if (x509Credentials == null) {

                    "No server certificate for ECDH client key exchange");

            }

            PublicKey publicKey = x509Credentials.popPublicKey;

            if (!publicKey.getAlgorithm().equals("EC")) {

                    "Not EC server certificate for ECDH client key exchange");

            }

            ECParameterSpec params = ((ECPublicKey)publicKey).getParams();

            NamedGroup namedGroup = NamedGroup.valueOf(params);

            if (namedGroup == null) {

                    "Unsupported EC server cert for ECDH client key exchange");

            }

            ECDHEPossession ecdhePossession = new ECDHEPossession(

                    namedGroup, chc.sslContext.getSecureRandom());

            chc.handshakePossessions.add(ecdhePossession);

            ECDHClientKeyExchangeMessage cke =

                    new ECDHClientKeyExchangeMessage(

                            chc, ecdhePossession.publicKey);

            if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {

                SSLLogger.fine(

                    "Produced ECDH ClientKeyExchange handshake message", cke);

            }

            // Output the handshake message.

            cke.write(chc.handshakeOutput);

            chc.handshakeOutput.flush();

            // update the states

            SSLKeyExchange ke = SSLKeyExchange.valueOf(

                    chc.negotiatedCipherSuite.keyExchange,

                    chc.negotiatedProtocol);

            if (ke == null) {

                // unlikely

                        "Not supported key exchange type");

            } else {

                SSLKeyDerivation masterKD = ke.createKeyDerivation(chc);

                SecretKey masterSecret =

                        masterKD.deriveKey("MasterSecret", null);

                chc.handshakeSession.setMasterSecret(masterSecret);

                SSLTrafficKeyDerivation kd =

                        SSLTrafficKeyDerivation.valueOf(chc.negotiatedProtocol);

                if (kd == null) {

                    // unlikely

                            "Not supported key derivation: " +

                            chc.negotiatedProtocol);

                } else {

                    chc.handshakeKeyDerivation =

                        kd.createKeyDerivation(chc, masterSecret);

                }

            }

            // The handshake message has been delivered.

            return null;

        }

    }

    /**

     * The ECDH "ClientKeyExchange" handshake message consumer.

     */

    private static final

            class ECDHClientKeyExchangeConsumer implements SSLConsumer {

        // Prevent instantiation of this class.

        private ECDHClientKeyExchangeConsumer() {

            // blank

        }

        @Override

        public void consume(ConnectionContext context,

                ByteBuffer message) throws IOException {

            // The consuming happens in server side only.

            ServerHandshakeContext shc = (ServerHandshakeContext)context;

            X509Possession x509Possession = null;

            for (SSLPossession possession : shc.handshakePossessions) {

                if (possession instanceof X509Possession) {

                    x509Possession = (X509Possession)possession;

                    break;

                }

            }

            if (x509Possession == null) {

                // unlikely, have been checked during cipher suite negotiation.

                    "No expected EC server cert for ECDH client key exchange");

            }

            PrivateKey privateKey = x509Possession.popPrivateKey;

            if (!privateKey.getAlgorithm().equals("EC")) {

                // unlikely, have been checked during cipher suite negotiation.

                    "Not EC server cert for ECDH client key exchange");

            }

            ECParameterSpec params = ((ECPrivateKey)privateKey).getParams();

            NamedGroup namedGroup = NamedGroup.valueOf(params);

            if (namedGroup == null) {

                // unlikely, have been checked during cipher suite negotiation.

                    "Unsupported EC server cert for ECDH client key exchange");

            }

            SSLKeyExchange ke = SSLKeyExchange.valueOf(

                    shc.negotiatedCipherSuite.keyExchange,

                    shc.negotiatedProtocol);

            if (ke == null) {

                // unlikely

                        "Not supported key exchange type");

            }

            // parse the handshake message

            ECDHClientKeyExchangeMessage cke =

                    new ECDHClientKeyExchangeMessage(shc, message);

            if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {

                SSLLogger.fine(

                    "Consuming ECDH ClientKeyExchange handshake message", cke);

            }

            // create the credentials

            try {

                ECPoint point =

                    JsseJce.decodePoint(cke.encodedPoint, params.getCurve());

                ECPublicKeySpec spec = new ECPublicKeySpec(point, params);

                KeyFactory kf = JsseJce.getKeyFactory("EC");

                ECPublicKey peerPublicKey =

                        (ECPublicKey)kf.generatePublic(spec);

                // check constraints of peer ECPublicKey

                if (!shc.algorithmConstraints.permits(

                        EnumSet.of(CryptoPrimitive.KEY_AGREEMENT),

                        peerPublicKey)) {

                    throw new SSLHandshakeException(

                        "ECPublicKey does not comply to algorithm constraints");

                }

                shc.handshakeCredentials.add(new ECDHECredentials(

                        peerPublicKey, namedGroup));

            } catch (GeneralSecurityException | java.io.IOException e) {

                throw (SSLHandshakeException)(new SSLHandshakeException(

                        "Could not generate ECPublicKey").initCause(e));

            }

            // update the states

            SSLKeyDerivation masterKD = ke.createKeyDerivation(shc);

            SecretKey masterSecret =

                    masterKD.deriveKey("MasterSecret", null);

            shc.handshakeSession.setMasterSecret(masterSecret);

            SSLTrafficKeyDerivation kd =

                    SSLTrafficKeyDerivation.valueOf(shc.negotiatedProtocol);

            if (kd == null) {

                // unlikely

                    "Not supported key derivation: " + shc.negotiatedProtocol);

            } else {

                shc.handshakeKeyDerivation =

                    kd.createKeyDerivation(shc, masterSecret);

            }

        }

    }

    /**

     * The ECDHE "ClientKeyExchange" handshake message producer.

     */

    private static final

            class ECDHEClientKeyExchangeProducer implements HandshakeProducer {

        // Prevent instantiation of this class.

        private ECDHEClientKeyExchangeProducer() {

            // blank

        }

        @Override

        public byte[] produce(ConnectionContext context,

                HandshakeMessage message) throws IOException {

            // The producing happens in client side only.

            ClientHandshakeContext chc = (ClientHandshakeContext)context;

            ECDHECredentials ecdheCredentials = null;

            for (SSLCredentials cd : chc.handshakeCredentials) {

                if (cd instanceof ECDHECredentials) {

                    ecdheCredentials = (ECDHECredentials)cd;

                    break;

                }

            }

            if (ecdheCredentials == null) {

                    "No ECDHE credentials negotiated for client key exchange");

            }

            ECDHEPossession ecdhePossession = new ECDHEPossession(

                    ecdheCredentials, chc.sslContext.getSecureRandom());

            chc.handshakePossessions.add(ecdhePossession);

            ECDHClientKeyExchangeMessage cke =

                    new ECDHClientKeyExchangeMessage(

                            chc, ecdhePossession.publicKey);

            if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {

                SSLLogger.fine(

                    "Produced ECDHE ClientKeyExchange handshake message", cke);

            }

            // Output the handshake message.

            cke.write(chc.handshakeOutput);

            chc.handshakeOutput.flush();

            // update the states

            SSLKeyExchange ke = SSLKeyExchange.valueOf(

                    chc.negotiatedCipherSuite.keyExchange,

                    chc.negotiatedProtocol);

            if (ke == null) {

                // unlikely

                        "Not supported key exchange type");

            } else {

                SSLKeyDerivation masterKD = ke.createKeyDerivation(chc);

                SecretKey masterSecret =

                        masterKD.deriveKey("MasterSecret", null);

                chc.handshakeSession.setMasterSecret(masterSecret);

                SSLTrafficKeyDerivation kd =

                        SSLTrafficKeyDerivation.valueOf(chc.negotiatedProtocol);

                if (kd == null) {

                    // unlikely

                            "Not supported key derivation: " +

                            chc.negotiatedProtocol);

                } else {

                    chc.handshakeKeyDerivation =

                        kd.createKeyDerivation(chc, masterSecret);

                }

            }

            // The handshake message has been delivered.

            return null;

        }

    }

    /**

     * The ECDHE "ClientKeyExchange" handshake message consumer.

     */

    private static final

            class ECDHEClientKeyExchangeConsumer implements SSLConsumer {

        // Prevent instantiation of this class.

        private ECDHEClientKeyExchangeConsumer() {

            // blank

        }

        @Override

        public void consume(ConnectionContext context,

                ByteBuffer message) throws IOException {

            // The consuming happens in server side only.

            ServerHandshakeContext shc = (ServerHandshakeContext)context;

            ECDHEPossession ecdhePossession = null;

            for (SSLPossession possession : shc.handshakePossessions) {

                if (possession instanceof ECDHEPossession) {

                    ecdhePossession = (ECDHEPossession)possession;

                    break;

                }

            }

            if (ecdhePossession == null) {

                // unlikely

                    "No expected ECDHE possessions for client key exchange");

            }

            ECParameterSpec params = ecdhePossession.publicKey.getParams();

            NamedGroup namedGroup = NamedGroup.valueOf(params);

            if (namedGroup == null) {

                // unlikely, have been checked during cipher suite negotiation.

                    "Unsupported EC server cert for ECDHE client key exchange");

            }

            SSLKeyExchange ke = SSLKeyExchange.valueOf(

                    shc.negotiatedCipherSuite.keyExchange,

                    shc.negotiatedProtocol);

            if (ke == null) {

                // unlikely

                        "Not supported key exchange type");

            }

            // parse the handshake message

            ECDHClientKeyExchangeMessage cke =

                    new ECDHClientKeyExchangeMessage(shc, message);

            if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {

                SSLLogger.fine(

                    "Consuming ECDHE ClientKeyExchange handshake message", cke);

            }

            // create the credentials

            try {