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/*
* Copyright (c) 2006, 2017, 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.security.*;
import java.security.interfaces.ECPublicKey;
import java.security.spec.*;
import java.util.EnumSet;
import javax.crypto.SecretKey;
import javax.crypto.KeyAgreement;
import javax.net.ssl.SSLHandshakeException;
/**
* Helper class for the ECDH key exchange. It generates the appropriate
* ephemeral keys as necessary and performs the actual shared secret derivation.
*
* @since 1.6
* @author Andreas Sterbenz
*/
final class ECDHCrypt {
// our private key
private PrivateKey privateKey;
// our public key
private ECPublicKey publicKey;
// Called by ServerHandshaker for static ECDH
ECDHCrypt(PrivateKey privateKey, PublicKey publicKey) {
this.privateKey = privateKey;
this.publicKey = (ECPublicKey)publicKey;
}
// Called by ServerHandshaker for ephemeral ECDH
ECDHCrypt(NamedGroup namedGroup, SecureRandom random) {
try {
KeyPairGenerator kpg = JsseJce.getKeyPairGenerator("EC");
ECGenParameterSpec params =
SupportedGroupsExtension.getECGenParamSpec(namedGroup);
kpg.initialize(params, random);
KeyPair kp = kpg.generateKeyPair();
privateKey = kp.getPrivate();
publicKey = (ECPublicKey)kp.getPublic();
} catch (GeneralSecurityException e) {
throw new RuntimeException("Could not generate ECDH keypair", e);
}
}
// Called by ClientHandshaker with params it received from the server
ECDHCrypt(ECParameterSpec params, SecureRandom random) {
try {
KeyPairGenerator kpg = JsseJce.getKeyPairGenerator("EC");
kpg.initialize(params, random);
KeyPair kp = kpg.generateKeyPair();
privateKey = kp.getPrivate();
publicKey = (ECPublicKey)kp.getPublic();
} catch (GeneralSecurityException e) {
throw new RuntimeException("Could not generate ECDH keypair", e);
}
}
/**
* Gets the public key of this end of the key exchange.
*/
PublicKey getPublicKey() {
return publicKey;
}
// called by ClientHandshaker with either the server's static or
// ephemeral public key
SecretKey getAgreedSecret(
PublicKey peerPublicKey) throws SSLHandshakeException {
try {
KeyAgreement ka = JsseJce.getKeyAgreement("ECDH");
ka.init(privateKey);
ka.doPhase(peerPublicKey, true);
return ka.generateSecret("TlsPremasterSecret");
} catch (GeneralSecurityException e) {
throw (SSLHandshakeException) new SSLHandshakeException(
"Could not generate secret").initCause(e);
}
}
// called by ServerHandshaker
SecretKey getAgreedSecret(
byte[] encodedPoint) throws SSLHandshakeException {
try {
ECParameterSpec params = publicKey.getParams();
ECPoint point =
JsseJce.decodePoint(encodedPoint, params.getCurve());
KeyFactory kf = JsseJce.getKeyFactory("EC");
ECPublicKeySpec spec = new ECPublicKeySpec(point, params);
PublicKey peerPublicKey = kf.generatePublic(spec);
return getAgreedSecret(peerPublicKey);
} catch (GeneralSecurityException | java.io.IOException e) {
throw (SSLHandshakeException) new SSLHandshakeException(
"Could not generate secret").initCause(e);
}
}
// Check constraints of the specified EC public key.
void checkConstraints(AlgorithmConstraints constraints,
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 publicKey = (ECPublicKey)kf.generatePublic(spec);
// check constraints of ECPublicKey
if (!constraints.permits(
EnumSet.of(CryptoPrimitive.KEY_AGREEMENT), publicKey)) {
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);
}
}
}