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| 1 | /* | ||
| 2 | * Copyright (c) 2009, 2011, 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.math.BigInteger; | ||
| 29 | import java.security.*; | ||
| 30 | import java.security.spec.AlgorithmParameterSpec; | ||
| 31 | import java.security.spec.ECGenParameterSpec; | ||
| 32 | import java.security.spec.ECParameterSpec; | ||
| 33 | import java.security.spec.ECPoint; | ||
| 34 | |||
| 35 | import sun.security.ec.NamedCurve; | ||
| 36 | import sun.security.ec.ECParameters; | ||
| 37 | import sun.security.ec.ECPrivateKeyImpl; | ||
| 38 | import sun.security.ec.ECPublicKeyImpl; | ||
| 39 | import sun.security.jca.JCAUtil; | ||
| 40 | |||
| 41 | /** | ||
| 42 | * EC keypair generator. | ||
| 43 | * Standard algorithm, minimum key length is 112 bits, maximum is 571 bits. | ||
| 44 | * | ||
| 45 | * @since 1.7 | ||
| 46 | */ | ||
| 47 | public final class ECKeyPairGenerator extends KeyPairGeneratorSpi { | ||
| 48 | |||
| 49 | private static final int KEY_SIZE_MIN = 112; // min bits (see ecc_impl.h) | ||
| 50 | private static final int KEY_SIZE_MAX = 571; // max bits (see ecc_impl.h) | ||
| 51 | private static final int KEY_SIZE_DEFAULT = 256; | ||
| 52 | |||
| 53 | // used to seed the keypair generator | ||
| 54 | private SecureRandom random; | ||
| 55 | |||
| 56 | // size of the key to generate, KEY_SIZE_MIN <= keySize <= KEY_SIZE_MAX | ||
| 57 | private int keySize; | ||
| 58 | |||
| 59 | // parameters specified via init, if any | ||
| 60 | private AlgorithmParameterSpec params = null; | ||
| 61 | |||
| 62 | /** | ||
| 63 | * Constructs a new ECKeyPairGenerator. | ||
| 64 | */ | ||
| 65 | public ECKeyPairGenerator() { | ||
| 66 | // initialize to default in case the app does not call initialize() | ||
| 67 | initialize(KEY_SIZE_DEFAULT, null); | ||
| 68 | } | ||
| 69 | |||
| 70 | // initialize the generator. See JCA doc | ||
| 71 | @Override | ||
| 72 | public void initialize(int keySize, SecureRandom random) { | ||
| 73 | |||
| 74 | checkKeySize(keySize); | ||
| 75 | this.params = NamedCurve.getECParameterSpec(keySize); | ||
| 76 | if (params == null) { | ||
| 77 | throw new InvalidParameterException( | ||
| 78 | "No EC parameters available for key size " + keySize + " bits"); | ||
| 79 | } | ||
| 80 | this.random = random; | ||
| 81 | } | ||
| 82 | |||
| 83 | // second initialize method. See JCA doc | ||
| 84 | @Override | ||
| 85 | public void initialize(AlgorithmParameterSpec params, SecureRandom random) | ||
| 86 | throws InvalidAlgorithmParameterException { | ||
| 87 | |||
| 88 | if (params instanceof ECParameterSpec) { | ||
| 89 | this.params = ECParameters.getNamedCurve((ECParameterSpec)params); | ||
| 90 | if (this.params == null) { | ||
| 91 | throw new InvalidAlgorithmParameterException( | ||
| 92 | "Unsupported curve: " + params); | ||
| 93 | } | ||
| 94 | } else if (params instanceof ECGenParameterSpec) { | ||
| 95 | String name = ((ECGenParameterSpec)params).getName(); | ||
| 96 | this.params = NamedCurve.getECParameterSpec(name); | ||
| 97 | if (this.params == null) { | ||
| 98 | throw new InvalidAlgorithmParameterException( | ||
| 99 | "Unknown curve name: " + name); | ||
| 100 | } | ||
| 101 | } else { | ||
| 102 | throw new InvalidAlgorithmParameterException( | ||
| 103 | "ECParameterSpec or ECGenParameterSpec required for EC"); | ||
| 104 | } | ||
| 105 | this.keySize = | ||
| 106 | ((ECParameterSpec)this.params).getCurve().getField().getFieldSize(); | ||
| 107 | this.random = random; | ||
| 108 | } | ||
| 109 | |||
| 110 | // generate the keypair. See JCA doc | ||
| 111 | @Override | ||
| 112 | public KeyPair generateKeyPair() { | ||
| 113 | |||
| 114 | byte[] encodedParams = | ||
| 115 | ECParameters.encodeParameters((ECParameterSpec)params); | ||
| 116 | |||
| 117 | // seed is twice the key size (in bytes) plus 1 | ||
| 118 | byte[] seed = new byte[(((keySize + 7) >> 3) + 1) * 2]; | ||
| 119 | if (random == null) { | ||
| 120 | random = JCAUtil.getSecureRandom(); | ||
| 121 | } | ||
| 122 | random.nextBytes(seed); | ||
| 123 | |||
| 124 | try { | ||
| 125 | |||
| 126 | long[] handles = generateECKeyPair(keySize, encodedParams, seed); | ||
| 127 | |||
| 128 | // The 'params' object supplied above is equivalent to the native | ||
| 129 | // one so there is no need to fetch it. | ||
| 130 | |||
| 131 | // handles[0] points to the native private key | ||
| 132 | BigInteger s = new BigInteger(1, getEncodedBytes(handles[0])); | ||
| 133 | |||
| 134 | PrivateKey privateKey = | ||
| 135 | new ECPrivateKeyImpl(s, (ECParameterSpec)params); | ||
| 136 | |||
| 137 | // handles[1] points to the native public key | ||
| 138 | ECPoint w = ECParameters.decodePoint(getEncodedBytes(handles[1]), | ||
| 139 | ((ECParameterSpec)params).getCurve()); | ||
| 140 | PublicKey publicKey = | ||
| 141 | new ECPublicKeyImpl(w, (ECParameterSpec)params); | ||
| 142 | |||
| 143 | return new KeyPair(publicKey, privateKey); | ||
| 144 | |||
| 145 | } catch (Exception e) { | ||
| 146 | throw new ProviderException(e); | ||
| 147 | } | ||
| 148 | } | ||
| 149 | |||
| 150 | private void checkKeySize(int keySize) throws InvalidParameterException { | ||
| 151 | if (keySize < KEY_SIZE_MIN) { | ||
| 152 | throw new InvalidParameterException | ||
| 153 | ("Key size must be at least " + KEY_SIZE_MIN + " bits"); | ||
| 154 | } | ||
| 155 | if (keySize > KEY_SIZE_MAX) { | ||
| 156 | throw new InvalidParameterException | ||
| 157 | ("Key size must be at most " + KEY_SIZE_MAX + " bits"); | ||
| 158 | } | ||
| 159 | this.keySize = keySize; | ||
| 160 | } | ||
| 161 | |||
| 162 | /* | ||
| 163 | * Generates the keypair and returns a 2-element array of handles. | ||
| 164 | * The first handle points to the private key, the second to the public key. | ||
| 165 | */ | ||
| 166 | private static native long[] generateECKeyPair(int keySize, | ||
| 167 | byte[] encodedParams, byte[] seed) throws GeneralSecurityException; | ||
| 168 | |||
| 169 | /* | ||
| 170 | * Extracts the encoded key data using the supplied handle. | ||
| 171 | */ | ||
| 172 | private static native byte[] getEncodedBytes(long handle); | ||
| 173 | } | ||