Showing the changes to java/pkg/sun/security/pkcs11/P11SecureRandom.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,200 @@ | |||
| 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 | } | ||