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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 | } | ||