| /* |
| * 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 |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| 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); |
| } |
| } |
| |
| } |