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| 1 | +/* | |
| 2 | + * Copyright (c) 2006, 2007, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.security.ssl; | |
| 27 | + | |
| 28 | +import java.security.*; | |
| 29 | +import java.security.interfaces.ECPublicKey; | |
| 30 | +import java.security.spec.*; | |
| 31 | + | |
| 32 | +import javax.crypto.SecretKey; | |
| 33 | +import javax.crypto.KeyAgreement; | |
| 34 | +import javax.crypto.spec.*; | |
| 35 | + | |
| 36 | +/** | |
| 37 | + * Helper class for the ECDH key exchange. It generates the appropriate | |
| 38 | + * ephemeral keys as necessary and performs the actual shared secret derivation. | |
| 39 | + * | |
| 40 | + * @since 1.6 | |
| 41 | + * @author Andreas Sterbenz | |
| 42 | + */ | |
| 43 | +final class ECDHCrypt { | |
| 44 | + | |
| 45 | + // our private key | |
| 46 | + private PrivateKey privateKey; | |
| 47 | + | |
| 48 | + // our public key | |
| 49 | + private ECPublicKey publicKey; | |
| 50 | + | |
| 51 | + // Called by ServerHandshaker for static ECDH | |
| 52 | + ECDHCrypt(PrivateKey privateKey, PublicKey publicKey) { | |
| 53 | + this.privateKey = privateKey; | |
| 54 | + this.publicKey = (ECPublicKey)publicKey; | |
| 55 | + } | |
| 56 | + | |
| 57 | + // Called by ServerHandshaker for ephemeral ECDH | |
| 58 | + ECDHCrypt(String curveName, SecureRandom random) { | |
| 59 | + try { | |
| 60 | + KeyPairGenerator kpg = JsseJce.getKeyPairGenerator("EC"); | |
| 61 | + ECGenParameterSpec params = new ECGenParameterSpec(curveName); | |
| 62 | + kpg.initialize(params, random); | |
| 63 | + KeyPair kp = kpg.generateKeyPair(); | |
| 64 | + privateKey = kp.getPrivate(); | |
| 65 | + publicKey = (ECPublicKey)kp.getPublic(); | |
| 66 | + } catch (GeneralSecurityException e) { | |
| 67 | + throw new RuntimeException("Could not generate DH keypair", e); | |
| 68 | + } | |
| 69 | + } | |
| 70 | + | |
| 71 | + // Called by ClientHandshaker with params it received from the server | |
| 72 | + ECDHCrypt(ECParameterSpec params, SecureRandom random) { | |
| 73 | + try { | |
| 74 | + KeyPairGenerator kpg = JsseJce.getKeyPairGenerator("EC"); | |
| 75 | + kpg.initialize(params, random); | |
| 76 | + KeyPair kp = kpg.generateKeyPair(); | |
| 77 | + privateKey = kp.getPrivate(); | |
| 78 | + publicKey = (ECPublicKey)kp.getPublic(); | |
| 79 | + } catch (GeneralSecurityException e) { | |
| 80 | + throw new RuntimeException("Could not generate DH keypair", e); | |
| 81 | + } | |
| 82 | + } | |
| 83 | + | |
| 84 | + /** | |
| 85 | + * Gets the public key of this end of the key exchange. | |
| 86 | + */ | |
| 87 | + PublicKey getPublicKey() { | |
| 88 | + return publicKey; | |
| 89 | + } | |
| 90 | + | |
| 91 | + // called by ClientHandshaker with either the server's static or ephemeral public key | |
| 92 | + SecretKey getAgreedSecret(PublicKey peerPublicKey) { | |
| 93 | + try { | |
| 94 | + KeyAgreement ka = JsseJce.getKeyAgreement("ECDH"); | |
| 95 | + ka.init(privateKey); | |
| 96 | + ka.doPhase(peerPublicKey, true); | |
| 97 | + return ka.generateSecret("TlsPremasterSecret"); | |
| 98 | + } catch (GeneralSecurityException e) { | |
| 99 | + throw new RuntimeException("Could not generate secret", e); | |
| 100 | + } | |
| 101 | + } | |
| 102 | + | |
| 103 | + // called by ServerHandshaker | |
| 104 | + SecretKey getAgreedSecret(byte[] encodedPoint) { | |
| 105 | + try { | |
| 106 | + ECParameterSpec params = publicKey.getParams(); | |
| 107 | + ECPoint point = JsseJce.decodePoint(encodedPoint, params.getCurve()); | |
| 108 | + KeyFactory kf = JsseJce.getKeyFactory("EC"); | |
| 109 | + ECPublicKeySpec spec = new ECPublicKeySpec(point, params); | |
| 110 | + PublicKey peerPublicKey = kf.generatePublic(spec); | |
| 111 | + return getAgreedSecret(peerPublicKey); | |
| 112 | + } catch (GeneralSecurityException e) { | |
| 113 | + throw new RuntimeException("Could not generate secret", e); | |
| 114 | + } catch (java.io.IOException e) { | |
| 115 | + throw new RuntimeException("Could not generate secret", e); | |
| 116 | + } | |
| 117 | + } | |
| 118 | + | |
| 119 | +} | |