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| 1 | +/* | |
| 2 | + * Copyright (c) 2009, 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.ec; | |
| 27 | + | |
| 28 | +import java.security.*; | |
| 29 | +import java.security.interfaces.*; | |
| 30 | +import java.security.spec.*; | |
| 31 | + | |
| 32 | +import javax.crypto.*; | |
| 33 | +import javax.crypto.spec.*; | |
| 34 | + | |
| 35 | +/** | |
| 36 | + * KeyAgreement implementation for ECDH. | |
| 37 | + * | |
| 38 | + * @since 1.7 | |
| 39 | + */ | |
| 40 | +public final class ECDHKeyAgreement extends KeyAgreementSpi { | |
| 41 | + | |
| 42 | + // private key, if initialized | |
| 43 | + private ECPrivateKey privateKey; | |
| 44 | + | |
| 45 | + // encoded public point, non-null between doPhase() & generateSecret() only | |
| 46 | + private byte[] publicValue; | |
| 47 | + | |
| 48 | + // length of the secret to be derived | |
| 49 | + private int secretLen; | |
| 50 | + | |
| 51 | + /** | |
| 52 | + * Constructs a new ECDHKeyAgreement. | |
| 53 | + */ | |
| 54 | + public ECDHKeyAgreement() { | |
| 55 | + } | |
| 56 | + | |
| 57 | + // see JCE spec | |
| 58 | + @Override | |
| 59 | + protected void engineInit(Key key, SecureRandom random) | |
| 60 | + throws InvalidKeyException { | |
| 61 | + if (!(key instanceof PrivateKey)) { | |
| 62 | + throw new InvalidKeyException | |
| 63 | + ("Key must be instance of PrivateKey"); | |
| 64 | + } | |
| 65 | + privateKey = (ECPrivateKey) ECKeyFactory.toECKey(key); | |
| 66 | + publicValue = null; | |
| 67 | + } | |
| 68 | + | |
| 69 | + // see JCE spec | |
| 70 | + @Override | |
| 71 | + protected void engineInit(Key key, AlgorithmParameterSpec params, | |
| 72 | + SecureRandom random) throws InvalidKeyException, | |
| 73 | + InvalidAlgorithmParameterException { | |
| 74 | + if (params != null) { | |
| 75 | + throw new InvalidAlgorithmParameterException | |
| 76 | + ("Parameters not supported"); | |
| 77 | + } | |
| 78 | + engineInit(key, random); | |
| 79 | + } | |
| 80 | + | |
| 81 | + // see JCE spec | |
| 82 | + @Override | |
| 83 | + protected Key engineDoPhase(Key key, boolean lastPhase) | |
| 84 | + throws InvalidKeyException, IllegalStateException { | |
| 85 | + if (privateKey == null) { | |
| 86 | + throw new IllegalStateException("Not initialized"); | |
| 87 | + } | |
| 88 | + if (publicValue != null) { | |
| 89 | + throw new IllegalStateException("Phase already executed"); | |
| 90 | + } | |
| 91 | + if (!lastPhase) { | |
| 92 | + throw new IllegalStateException | |
| 93 | + ("Only two party agreement supported, lastPhase must be true"); | |
| 94 | + } | |
| 95 | + if (!(key instanceof ECPublicKey)) { | |
| 96 | + throw new InvalidKeyException | |
| 97 | + ("Key must be a PublicKey with algorithm EC"); | |
| 98 | + } | |
| 99 | + | |
| 100 | + ECPublicKey ecKey = (ECPublicKey)key; | |
| 101 | + ECParameterSpec params = ecKey.getParams(); | |
| 102 | + | |
| 103 | + if (ecKey instanceof ECPublicKeyImpl) { | |
| 104 | + publicValue = ((ECPublicKeyImpl)ecKey).getEncodedPublicValue(); | |
| 105 | + } else { // instanceof ECPublicKey | |
| 106 | + publicValue = | |
| 107 | + ECParameters.encodePoint(ecKey.getW(), params.getCurve()); | |
| 108 | + } | |
| 109 | + int keyLenBits = params.getCurve().getField().getFieldSize(); | |
| 110 | + secretLen = (keyLenBits + 7) >> 3; | |
| 111 | + | |
| 112 | + return null; | |
| 113 | + } | |
| 114 | + | |
| 115 | + // see JCE spec | |
| 116 | + @Override | |
| 117 | + protected byte[] engineGenerateSecret() throws IllegalStateException { | |
| 118 | + if ((privateKey == null) || (publicValue == null)) { | |
| 119 | + throw new IllegalStateException("Not initialized correctly"); | |
| 120 | + } | |
| 121 | + | |
| 122 | + byte[] s = privateKey.getS().toByteArray(); | |
| 123 | + byte[] encodedParams = | |
| 124 | + ECParameters.encodeParameters(privateKey.getParams()); // DER OID | |
| 125 | + | |
| 126 | + try { | |
| 127 | + | |
| 128 | + return deriveKey(s, publicValue, encodedParams); | |
| 129 | + | |
| 130 | + } catch (GeneralSecurityException e) { | |
| 131 | + throw new ProviderException("Could not derive key", e); | |
| 132 | + } | |
| 133 | + | |
| 134 | + } | |
| 135 | + | |
| 136 | + // see JCE spec | |
| 137 | + @Override | |
| 138 | + protected int engineGenerateSecret(byte[] sharedSecret, int | |
| 139 | + offset) throws IllegalStateException, ShortBufferException { | |
| 140 | + if (offset + secretLen > sharedSecret.length) { | |
| 141 | + throw new ShortBufferException("Need " + secretLen | |
| 142 | + + " bytes, only " + (sharedSecret.length - offset) + " available"); | |
| 143 | + } | |
| 144 | + byte[] secret = engineGenerateSecret(); | |
| 145 | + System.arraycopy(secret, 0, sharedSecret, offset, secret.length); | |
| 146 | + return secret.length; | |
| 147 | + } | |
| 148 | + | |
| 149 | + // see JCE spec | |
| 150 | + @Override | |
| 151 | + protected SecretKey engineGenerateSecret(String algorithm) | |
| 152 | + throws IllegalStateException, NoSuchAlgorithmException, | |
| 153 | + InvalidKeyException { | |
| 154 | + if (algorithm == null) { | |
| 155 | + throw new NoSuchAlgorithmException("Algorithm must not be null"); | |
| 156 | + } | |
| 157 | + if (!(algorithm.equals("TlsPremasterSecret"))) { | |
| 158 | + throw new NoSuchAlgorithmException | |
| 159 | + ("Only supported for algorithm TlsPremasterSecret"); | |
| 160 | + } | |
| 161 | + return new SecretKeySpec(engineGenerateSecret(), "TlsPremasterSecret"); | |
| 162 | + } | |
| 163 | + | |
| 164 | + /** | |
| 165 | + * Generates a secret key using the public and private keys. | |
| 166 | + * | |
| 167 | + * @param s the private key's S value. | |
| 168 | + * @param w the public key's W point (in uncompressed form). | |
| 169 | + * @param encodedParams the curve's DER encoded object identifier. | |
| 170 | + * | |
| 171 | + * @return byte[] the secret key. | |
| 172 | + */ | |
| 173 | + private static native byte[] deriveKey(byte[] s, byte[] w, | |
| 174 | + byte[] encodedParams) throws GeneralSecurityException; | |
| 175 | +} | |