Showing the changes to java/pkg/sun/security/ec/ECKeyPairGenerator.java (1 of 18352 files). Show all
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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 | +} | |