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| 1 | +/* | |
| 2 | + * Copyright (c) 1997, 2005, 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.provider; | |
| 27 | + | |
| 28 | +import java.math.BigInteger; | |
| 29 | + | |
| 30 | +import java.security.*; | |
| 31 | +import java.security.SecureRandom; | |
| 32 | +import java.security.interfaces.DSAParams; | |
| 33 | +import java.security.spec.AlgorithmParameterSpec; | |
| 34 | +import java.security.spec.InvalidParameterSpecException; | |
| 35 | +import java.security.spec.DSAParameterSpec; | |
| 36 | + | |
| 37 | +import sun.security.jca.JCAUtil; | |
| 38 | + | |
| 39 | +/** | |
| 40 | + * This class generates DSA key parameters and public/private key | |
| 41 | + * pairs according to the DSS standard NIST FIPS 186. It uses the | |
| 42 | + * updated version of SHA, SHA-1 as described in FIPS 180-1. | |
| 43 | + * | |
| 44 | + * @author Benjamin Renaud | |
| 45 | + * @author Andreas Sterbenz | |
| 46 | + * | |
| 47 | + */ | |
| 48 | +public class DSAKeyPairGenerator extends KeyPairGenerator | |
| 49 | +implements java.security.interfaces.DSAKeyPairGenerator { | |
| 50 | + | |
| 51 | + /* The modulus length */ | |
| 52 | + private int modlen; | |
| 53 | + | |
| 54 | + /* whether to force new parameters to be generated for each KeyPair */ | |
| 55 | + private boolean forceNewParameters; | |
| 56 | + | |
| 57 | + /* preset algorithm parameters. */ | |
| 58 | + private DSAParameterSpec params; | |
| 59 | + | |
| 60 | + /* The source of random bits to use */ | |
| 61 | + private SecureRandom random; | |
| 62 | + | |
| 63 | + public DSAKeyPairGenerator() { | |
| 64 | + super("DSA"); | |
| 65 | + initialize(1024, null); | |
| 66 | + } | |
| 67 | + | |
| 68 | + private static void checkStrength(int strength) { | |
| 69 | + if ((strength < 512) || (strength > 1024) || (strength % 64 != 0)) { | |
| 70 | + throw new InvalidParameterException | |
| 71 | + ("Modulus size must range from 512 to 1024 " | |
| 72 | + + "and be a multiple of 64"); | |
| 73 | + } | |
| 74 | + } | |
| 75 | + | |
| 76 | + public void initialize(int modlen, SecureRandom random) { | |
| 77 | + checkStrength(modlen); | |
| 78 | + this.random = random; | |
| 79 | + this.modlen = modlen; | |
| 80 | + this.params = null; | |
| 81 | + this.forceNewParameters = false; | |
| 82 | + } | |
| 83 | + | |
| 84 | + /** | |
| 85 | + * Initializes the DSA key pair generator. If <code>genParams</code> | |
| 86 | + * is false, a set of pre-computed parameters is used. | |
| 87 | + */ | |
| 88 | + public void initialize(int modlen, boolean genParams, SecureRandom random) { | |
| 89 | + checkStrength(modlen); | |
| 90 | + if (genParams) { | |
| 91 | + params = null; | |
| 92 | + } else { | |
| 93 | + params = ParameterCache.getCachedDSAParameterSpec(modlen); | |
| 94 | + if (params == null) { | |
| 95 | + throw new InvalidParameterException | |
| 96 | + ("No precomputed parameters for requested modulus size " | |
| 97 | + + "available"); | |
| 98 | + } | |
| 99 | + } | |
| 100 | + this.modlen = modlen; | |
| 101 | + this.random = random; | |
| 102 | + this.forceNewParameters = genParams; | |
| 103 | + } | |
| 104 | + | |
| 105 | + /** | |
| 106 | + * Initializes the DSA object using a DSA parameter object. | |
| 107 | + * | |
| 108 | + * @param params a fully initialized DSA parameter object. | |
| 109 | + */ | |
| 110 | + public void initialize(DSAParams params, SecureRandom random) { | |
| 111 | + if (params == null) { | |
| 112 | + throw new InvalidParameterException("Params must not be null"); | |
| 113 | + } | |
| 114 | + DSAParameterSpec spec = new DSAParameterSpec | |
| 115 | + (params.getP(), params.getQ(), params.getG()); | |
| 116 | + initialize0(spec, random); | |
| 117 | + } | |
| 118 | + | |
| 119 | + /** | |
| 120 | + * Initializes the DSA object using a parameter object. | |
| 121 | + * | |
| 122 | + * @param params the parameter set to be used to generate | |
| 123 | + * the keys. | |
| 124 | + * @param random the source of randomness for this generator. | |
| 125 | + * | |
| 126 | + * @exception InvalidAlgorithmParameterException if the given parameters | |
| 127 | + * are inappropriate for this key pair generator | |
| 128 | + */ | |
| 129 | + public void initialize(AlgorithmParameterSpec params, SecureRandom random) | |
| 130 | + throws InvalidAlgorithmParameterException { | |
| 131 | + if (!(params instanceof DSAParameterSpec)) { | |
| 132 | + throw new InvalidAlgorithmParameterException | |
| 133 | + ("Inappropriate parameter"); | |
| 134 | + } | |
| 135 | + initialize0((DSAParameterSpec)params, random); | |
| 136 | + } | |
| 137 | + | |
| 138 | + private void initialize0(DSAParameterSpec params, SecureRandom random) { | |
| 139 | + int modlen = params.getP().bitLength(); | |
| 140 | + checkStrength(modlen); | |
| 141 | + this.modlen = modlen; | |
| 142 | + this.params = params; | |
| 143 | + this.random = random; | |
| 144 | + this.forceNewParameters = false; | |
| 145 | + } | |
| 146 | + | |
| 147 | + /** | |
| 148 | + * Generates a pair of keys usable by any JavaSecurity compliant | |
| 149 | + * DSA implementation. | |
| 150 | + */ | |
| 151 | + public KeyPair generateKeyPair() { | |
| 152 | + if (random == null) { | |
| 153 | + random = JCAUtil.getSecureRandom(); | |
| 154 | + } | |
| 155 | + DSAParameterSpec spec; | |
| 156 | + try { | |
| 157 | + if (forceNewParameters) { | |
| 158 | + // generate new parameters each time | |
| 159 | + spec = ParameterCache.getNewDSAParameterSpec(modlen, random); | |
| 160 | + } else { | |
| 161 | + if (params == null) { | |
| 162 | + params = | |
| 163 | + ParameterCache.getDSAParameterSpec(modlen, random); | |
| 164 | + } | |
| 165 | + spec = params; | |
| 166 | + } | |
| 167 | + } catch (GeneralSecurityException e) { | |
| 168 | + throw new ProviderException(e); | |
| 169 | + } | |
| 170 | + return generateKeyPair(spec.getP(), spec.getQ(), spec.getG(), random); | |
| 171 | + } | |
| 172 | + | |
| 173 | + public KeyPair generateKeyPair(BigInteger p, BigInteger q, BigInteger g, | |
| 174 | + SecureRandom random) { | |
| 175 | + | |
| 176 | + BigInteger x = generateX(random, q); | |
| 177 | + BigInteger y = generateY(x, p, g); | |
| 178 | + | |
| 179 | + try { | |
| 180 | + | |
| 181 | + // See the comments in DSAKeyFactory, 4532506, and 6232513. | |
| 182 | + | |
| 183 | + DSAPublicKey pub; | |
| 184 | + if (DSAKeyFactory.SERIAL_INTEROP) { | |
| 185 | + pub = new DSAPublicKey(y, p, q, g); | |
| 186 | + } else { | |
| 187 | + pub = new DSAPublicKeyImpl(y, p, q, g); | |
| 188 | + } | |
| 189 | + DSAPrivateKey priv = new DSAPrivateKey(x, p, q, g); | |
| 190 | + | |
| 191 | + KeyPair pair = new KeyPair(pub, priv); | |
| 192 | + return pair; | |
| 193 | + } catch (InvalidKeyException e) { | |
| 194 | + throw new ProviderException(e); | |
| 195 | + } | |
| 196 | + } | |
| 197 | + | |
| 198 | + /** | |
| 199 | + * Generate the private key component of the key pair using the | |
| 200 | + * provided source of random bits. This method uses the random but | |
| 201 | + * source passed to generate a seed and then calls the seed-based | |
| 202 | + * generateX method. | |
| 203 | + */ | |
| 204 | + private BigInteger generateX(SecureRandom random, BigInteger q) { | |
| 205 | + BigInteger x = null; | |
| 206 | + while (true) { | |
| 207 | + int[] seed = new int[5]; | |
| 208 | + for (int i = 0; i < 5; i++) { | |
| 209 | + seed[i] = random.nextInt(); | |
| 210 | + } | |
| 211 | + x = generateX(seed, q); | |
| 212 | + if (x.signum() > 0 && (x.compareTo(q) < 0)) { | |
| 213 | + break; | |
| 214 | + } | |
| 215 | + } | |
| 216 | + return x; | |
| 217 | + } | |
| 218 | + | |
| 219 | + /** | |
| 220 | + * Given a seed, generate the private key component of the key | |
| 221 | + * pair. In the terminology used in the DSA specification | |
| 222 | + * (FIPS-186) seed is the XSEED quantity. | |
| 223 | + * | |
| 224 | + * @param seed the seed to use to generate the private key. | |
| 225 | + */ | |
| 226 | + BigInteger generateX(int[] seed, BigInteger q) { | |
| 227 | + | |
| 228 | + // check out t in the spec. | |
| 229 | + int[] t = { 0x67452301, 0xEFCDAB89, 0x98BADCFE, | |
| 230 | + 0x10325476, 0xC3D2E1F0 }; | |
| 231 | + // | |
| 232 | + | |
| 233 | + int[] tmp = DSA.SHA_7(seed, t); | |
| 234 | + byte[] tmpBytes = new byte[tmp.length * 4]; | |
| 235 | + for (int i = 0; i < tmp.length; i++) { | |
| 236 | + int k = tmp[i]; | |
| 237 | + for (int j = 0; j < 4; j++) { | |
| 238 | + tmpBytes[(i * 4) + j] = (byte) (k >>> (24 - (j * 8))); | |
| 239 | + } | |
| 240 | + } | |
| 241 | + BigInteger x = new BigInteger(1, tmpBytes).mod(q); | |
| 242 | + return x; | |
| 243 | + } | |
| 244 | + | |
| 245 | + /** | |
| 246 | + * Generate the public key component y of the key pair. | |
| 247 | + * | |
| 248 | + * @param x the private key component. | |
| 249 | + * | |
| 250 | + * @param p the base parameter. | |
| 251 | + */ | |
| 252 | + BigInteger generateY(BigInteger x, BigInteger p, BigInteger g) { | |
| 253 | + BigInteger y = g.modPow(x, p); | |
| 254 | + return y; | |
| 255 | + } | |
| 256 | + | |
| 257 | +} | |