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| 1 | +/* | |
| 2 | + * Copyright (c) 2003, 2010, 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.pkcs11; | |
| 27 | + | |
| 28 | +import java.util.*; | |
| 29 | +import java.io.*; | |
| 30 | +import java.security.*; | |
| 31 | + | |
| 32 | +import sun.security.pkcs11.wrapper.*; | |
| 33 | +import sun.security.pkcs11.wrapper.PKCS11Constants.*; | |
| 34 | + | |
| 35 | +/** | |
| 36 | + * SecureRandom implementation class. Some tokens support only | |
| 37 | + * C_GenerateRandom() and not C_SeedRandom(). In order not to lose an | |
| 38 | + * application specified seed, we create a SHA1PRNG that we mix with in that | |
| 39 | + * case. | |
| 40 | + * | |
| 41 | + * Note that since SecureRandom is thread safe, we only need one | |
| 42 | + * instance per PKCS#11 token instance. It is created on demand and cached | |
| 43 | + * in the SunPKCS11 class. | |
| 44 | + * | |
| 45 | + * Also note that we obtain the PKCS#11 session on demand, no need to tie one | |
| 46 | + * up. | |
| 47 | + * | |
| 48 | + * @author Andreas Sterbenz | |
| 49 | + * @since 1.5 | |
| 50 | + */ | |
| 51 | +final class P11SecureRandom extends SecureRandomSpi { | |
| 52 | + | |
| 53 | + private static final long serialVersionUID = -8939510236124553291L; | |
| 54 | + | |
| 55 | + // token instance | |
| 56 | + private final Token token; | |
| 57 | + | |
| 58 | + // PRNG for mixing, non-null if active (i.e. setSeed() has been called) | |
| 59 | + private volatile SecureRandom mixRandom; | |
| 60 | + | |
| 61 | + // buffer, if mixing is used | |
| 62 | + private byte[] mixBuffer; | |
| 63 | + | |
| 64 | + // bytes remaining in mixBuffer, if mixing is used | |
| 65 | + private int buffered; | |
| 66 | + | |
| 67 | + /* | |
| 68 | + * we buffer data internally for efficiency but limit the lifetime | |
| 69 | + * to avoid using stale bits. | |
| 70 | + */ | |
| 71 | + // lifetime in ms, currently 100 ms (0.1 s) | |
| 72 | + private static final long MAX_IBUFFER_TIME = 100; | |
| 73 | + | |
| 74 | + // size of the internal buffer | |
| 75 | + private static final int IBUFFER_SIZE = 32; | |
| 76 | + | |
| 77 | + // internal buffer for the random bits | |
| 78 | + private transient byte[] iBuffer = new byte[IBUFFER_SIZE]; | |
| 79 | + | |
| 80 | + // number of bytes remain in iBuffer | |
| 81 | + private transient int ibuffered = 0; | |
| 82 | + | |
| 83 | + // time that data was read into iBuffer | |
| 84 | + private transient long lastRead = 0L; | |
| 85 | + | |
| 86 | + P11SecureRandom(Token token) { | |
| 87 | + this.token = token; | |
| 88 | + } | |
| 89 | + | |
| 90 | + // see JCA spec | |
| 91 | + protected synchronized void engineSetSeed(byte[] seed) { | |
| 92 | + if (seed == null) { | |
| 93 | + throw new NullPointerException("seed must not be null"); | |
| 94 | + } | |
| 95 | + Session session = null; | |
| 96 | + try { | |
| 97 | + session = token.getOpSession(); | |
| 98 | + token.p11.C_SeedRandom(session.id(), seed); | |
| 99 | + } catch (PKCS11Exception e) { | |
| 100 | + // cannot set seed | |
| 101 | + // let a SHA1PRNG use that seed instead | |
| 102 | + SecureRandom random = mixRandom; | |
| 103 | + if (random != null) { | |
| 104 | + random.setSeed(seed); | |
| 105 | + } else { | |
| 106 | + try { | |
| 107 | + mixBuffer = new byte[20]; | |
| 108 | + random = SecureRandom.getInstance("SHA1PRNG"); | |
| 109 | + // initialize object before assigning to class field | |
| 110 | + random.setSeed(seed); | |
| 111 | + mixRandom = random; | |
| 112 | + } catch (NoSuchAlgorithmException ee) { | |
| 113 | + throw new ProviderException(ee); | |
| 114 | + } | |
| 115 | + } | |
| 116 | + } finally { | |
| 117 | + token.releaseSession(session); | |
| 118 | + } | |
| 119 | + } | |
| 120 | + | |
| 121 | + // see JCA spec | |
| 122 | + protected void engineNextBytes(byte[] bytes) { | |
| 123 | + if ((bytes == null) || (bytes.length == 0)) { | |
| 124 | + return; | |
| 125 | + } | |
| 126 | + if (bytes.length <= IBUFFER_SIZE) { | |
| 127 | + int ofs = 0; | |
| 128 | + synchronized (iBuffer) { | |
| 129 | + while (ofs < bytes.length) { | |
| 130 | + long time = System.currentTimeMillis(); | |
| 131 | + // refill the internal buffer if empty or stale | |
| 132 | + if ((ibuffered == 0) || | |
| 133 | + !(time - lastRead < MAX_IBUFFER_TIME)) { | |
| 134 | + lastRead = time; | |
| 135 | + implNextBytes(iBuffer); | |
| 136 | + ibuffered = IBUFFER_SIZE; | |
| 137 | + } | |
| 138 | + // copy the buffered bytes into 'bytes' | |
| 139 | + while ((ofs < bytes.length) && (ibuffered > 0)) { | |
| 140 | + bytes[ofs++] = iBuffer[IBUFFER_SIZE - ibuffered--]; | |
| 141 | + } | |
| 142 | + } | |
| 143 | + } | |
| 144 | + } else { | |
| 145 | + // avoid using the buffer - just fill bytes directly | |
| 146 | + implNextBytes(bytes); | |
| 147 | + } | |
| 148 | + | |
| 149 | + } | |
| 150 | + | |
| 151 | + // see JCA spec | |
| 152 | + protected byte[] engineGenerateSeed(int numBytes) { | |
| 153 | + byte[] b = new byte[numBytes]; | |
| 154 | + engineNextBytes(b); | |
| 155 | + return b; | |
| 156 | + } | |
| 157 | + | |
| 158 | + private void mix(byte[] b) { | |
| 159 | + SecureRandom random = mixRandom; | |
| 160 | + if (random == null) { | |
| 161 | + // avoid mixing if setSeed() has never been called | |
| 162 | + return; | |
| 163 | + } | |
| 164 | + synchronized (this) { | |
| 165 | + int ofs = 0; | |
| 166 | + int len = b.length; | |
| 167 | + while (len-- > 0) { | |
| 168 | + if (buffered == 0) { | |
| 169 | + random.nextBytes(mixBuffer); | |
| 170 | + buffered = mixBuffer.length; | |
| 171 | + } | |
| 172 | + b[ofs++] ^= mixBuffer[mixBuffer.length - buffered]; | |
| 173 | + buffered--; | |
| 174 | + } | |
| 175 | + } | |
| 176 | + } | |
| 177 | + | |
| 178 | + // fill up the specified buffer with random bytes, and mix them | |
| 179 | + private void implNextBytes(byte[] bytes) { | |
| 180 | + Session session = null; | |
| 181 | + try { | |
| 182 | + session = token.getOpSession(); | |
| 183 | + token.p11.C_GenerateRandom(session.id(), bytes); | |
| 184 | + mix(bytes); | |
| 185 | + } catch (PKCS11Exception e) { | |
| 186 | + throw new ProviderException("nextBytes() failed", e); | |
| 187 | + } finally { | |
| 188 | + token.releaseSession(session); | |
| 189 | + } | |
| 190 | + } | |
| 191 | + | |
| 192 | + private void readObject(ObjectInputStream in) | |
| 193 | + throws IOException, ClassNotFoundException { | |
| 194 | + in.defaultReadObject(); | |
| 195 | + // assign default values to non-null transient fields | |
| 196 | + iBuffer = new byte[IBUFFER_SIZE]; | |
| 197 | + ibuffered = 0; | |
| 198 | + lastRead = 0L; | |
| 199 | + } | |
| 200 | +} | |