author | plevart |
Wed, 21 Jan 2015 12:49:53 +0100 | |
changeset 28542 | d50a7783fe02 |
parent 25859 | 3317bb8137f4 |
child 30033 | b9c86c17164a |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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||
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package sun.security.provider; |
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import java.io.*; |
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import java.net.*; |
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import java.security.*; |
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import sun.security.util.Debug; |
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/** |
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* Native PRNG implementation for Solaris/Linux/MacOS. |
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* <p> |
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* It obtains seed and random numbers by reading system files such as |
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* the special device files /dev/random and /dev/urandom. This |
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* implementation respects the {@code securerandom.source} Security |
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* property and {@code java.security.egd} System property for obtaining |
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* seed material. If the file specified by the properties does not |
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* exist, /dev/random is the default seed source. /dev/urandom is |
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* the default source of random numbers. |
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* <p> |
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* On some Unix platforms, /dev/random may block until enough entropy is |
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* available, but that may negatively impact the perceived startup |
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* time. By selecting these sources, this implementation tries to |
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* strike a balance between performance and security. |
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* <p> |
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* generateSeed() and setSeed() attempt to directly read/write to the seed |
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* source. However, this file may only be writable by root in many |
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* configurations. Because we cannot just ignore bytes specified via |
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* setSeed(), we keep a SHA1PRNG around in parallel. |
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* <p> |
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* nextBytes() reads the bytes directly from the source of random |
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* numbers (and then mixes them with bytes from the SHA1PRNG for the |
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* reasons explained above). Reading bytes from the random generator means |
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* that we are generally getting entropy from the operating system. This |
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* is a notable advantage over the SHA1PRNG model, which acquires |
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* entropy only initially during startup although the VM may be running |
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* for months. |
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* <p> |
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* Also note for nextBytes() that we do not need any initial pure random |
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* seed from /dev/random. This is an advantage because on some versions |
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* of Linux entropy can be exhausted very quickly and could thus impact |
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* startup time. |
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* <p> |
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* Finally, note that we use a singleton for the actual work (RandomIO) |
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* to avoid having to open and close /dev/[u]random constantly. However, |
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* there may be many NativePRNG instances created by the JCA framework. |
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* |
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* @since 1.5 |
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* @author Andreas Sterbenz |
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*/ |
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public final class NativePRNG extends SecureRandomSpi { |
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private static final long serialVersionUID = -6599091113397072932L; |
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private static final Debug debug = Debug.getInstance("provider"); |
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// name of the pure random file (also used for setSeed()) |
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private static final String NAME_RANDOM = "/dev/random"; |
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// name of the pseudo random file |
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private static final String NAME_URANDOM = "/dev/urandom"; |
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// which kind of RandomIO object are we creating? |
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private enum Variant { |
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MIXED, BLOCKING, NONBLOCKING |
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} |
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// singleton instance or null if not available |
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private static final RandomIO INSTANCE = initIO(Variant.MIXED); |
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/** |
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* Get the System egd source (if defined). We only allow "file:" |
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* URLs for now. If there is a egd value, parse it. |
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* |
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* @return the URL or null if not available. |
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*/ |
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private static URL getEgdUrl() { |
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// This will return "" if nothing was set. |
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String egdSource = SunEntries.getSeedSource(); |
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URL egdUrl; |
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|
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if (egdSource.length() != 0) { |
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if (debug != null) { |
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debug.println("NativePRNG egdUrl: " + egdSource); |
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} |
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try { |
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egdUrl = new URL(egdSource); |
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if (!egdUrl.getProtocol().equalsIgnoreCase("file")) { |
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return null; |
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} |
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} catch (MalformedURLException e) { |
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return null; |
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} |
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} else { |
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egdUrl = null; |
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} |
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|
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return egdUrl; |
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} |
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|
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/** |
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* Create a RandomIO object for all I/O of this Variant type. |
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*/ |
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private static RandomIO initIO(final Variant v) { |
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return AccessController.doPrivileged( |
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new PrivilegedAction<RandomIO>() { |
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@Override |
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public RandomIO run() { |
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|
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File seedFile; |
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File nextFile; |
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|
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switch(v) { |
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case MIXED: |
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URL egdUrl; |
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File egdFile = null; |
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if ((egdUrl = getEgdUrl()) != null) { |
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try { |
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egdFile = SunEntries.getDeviceFile(egdUrl); |
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} catch (IOException e) { |
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// Swallow, seedFile is still null |
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} |
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} |
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// Try egd first. |
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if ((egdFile != null) && egdFile.canRead()) { |
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seedFile = egdFile; |
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} else { |
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// fall back to /dev/random. |
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seedFile = new File(NAME_RANDOM); |
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} |
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nextFile = new File(NAME_URANDOM); |
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break; |
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case BLOCKING: |
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seedFile = new File(NAME_RANDOM); |
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nextFile = new File(NAME_RANDOM); |
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break; |
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case NONBLOCKING: |
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seedFile = new File(NAME_URANDOM); |
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nextFile = new File(NAME_URANDOM); |
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break; |
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|
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default: |
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// Shouldn't happen! |
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return null; |
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} |
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|
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if (debug != null) { |
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debug.println("NativePRNG." + v + |
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" seedFile: " + seedFile + |
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" nextFile: " + nextFile); |
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} |
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|
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if (!seedFile.canRead() || !nextFile.canRead()) { |
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if (debug != null) { |
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debug.println("NativePRNG." + v + |
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" Couldn't read Files."); |
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} |
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return null; |
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} |
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|
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try { |
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return new RandomIO(seedFile, nextFile); |
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} catch (Exception e) { |
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return null; |
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} |
2 | 192 |
} |
193 |
}); |
|
194 |
} |
|
195 |
||
196 |
// return whether the NativePRNG is available |
|
197 |
static boolean isAvailable() { |
|
198 |
return INSTANCE != null; |
|
199 |
} |
|
200 |
||
201 |
// constructor, called by the JCA framework |
|
202 |
public NativePRNG() { |
|
203 |
super(); |
|
204 |
if (INSTANCE == null) { |
|
205 |
throw new AssertionError("NativePRNG not available"); |
|
206 |
} |
|
207 |
} |
|
208 |
||
209 |
// set the seed |
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@Override |
2 | 211 |
protected void engineSetSeed(byte[] seed) { |
212 |
INSTANCE.implSetSeed(seed); |
|
213 |
} |
|
214 |
||
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// get pseudo random bytes |
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@Override |
2 | 217 |
protected void engineNextBytes(byte[] bytes) { |
218 |
INSTANCE.implNextBytes(bytes); |
|
219 |
} |
|
220 |
||
221 |
// get true random bytes |
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@Override |
2 | 223 |
protected byte[] engineGenerateSeed(int numBytes) { |
224 |
return INSTANCE.implGenerateSeed(numBytes); |
|
225 |
} |
|
226 |
||
227 |
/** |
|
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* A NativePRNG-like class that uses /dev/random for both |
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* seed and random material. |
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* |
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* Note that it does not respect the egd properties, since we have |
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* no way of knowing what those qualities are. |
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* |
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* This is very similar to the outer NativePRNG class, minimizing any |
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* breakage to the serialization of the existing implementation. |
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* |
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* @since 1.8 |
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*/ |
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public static final class Blocking extends SecureRandomSpi { |
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private static final long serialVersionUID = -6396183145759983347L; |
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|
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private static final RandomIO INSTANCE = initIO(Variant.BLOCKING); |
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|
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// return whether this is available |
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static boolean isAvailable() { |
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return INSTANCE != null; |
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} |
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|
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// constructor, called by the JCA framework |
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public Blocking() { |
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super(); |
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if (INSTANCE == null) { |
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throw new AssertionError("NativePRNG$Blocking not available"); |
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254 |
} |
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255 |
} |
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256 |
|
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// set the seed |
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@Override |
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protected void engineSetSeed(byte[] seed) { |
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INSTANCE.implSetSeed(seed); |
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261 |
} |
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262 |
|
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263 |
// get pseudo random bytes |
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264 |
@Override |
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protected void engineNextBytes(byte[] bytes) { |
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266 |
INSTANCE.implNextBytes(bytes); |
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267 |
} |
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268 |
|
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// get true random bytes |
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270 |
@Override |
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protected byte[] engineGenerateSeed(int numBytes) { |
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return INSTANCE.implGenerateSeed(numBytes); |
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273 |
} |
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274 |
} |
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|
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276 |
/** |
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* A NativePRNG-like class that uses /dev/urandom for both |
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* seed and random material. |
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279 |
* |
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280 |
* Note that it does not respect the egd properties, since we have |
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281 |
* no way of knowing what those qualities are. |
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282 |
* |
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283 |
* This is very similar to the outer NativePRNG class, minimizing any |
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284 |
* breakage to the serialization of the existing implementation. |
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285 |
* |
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286 |
* @since 1.8 |
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287 |
*/ |
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public static final class NonBlocking extends SecureRandomSpi { |
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private static final long serialVersionUID = -1102062982994105487L; |
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290 |
|
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private static final RandomIO INSTANCE = initIO(Variant.NONBLOCKING); |
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292 |
|
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293 |
// return whether this is available |
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294 |
static boolean isAvailable() { |
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295 |
return INSTANCE != null; |
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296 |
} |
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297 |
|
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298 |
// constructor, called by the JCA framework |
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299 |
public NonBlocking() { |
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300 |
super(); |
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301 |
if (INSTANCE == null) { |
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302 |
throw new AssertionError( |
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303 |
"NativePRNG$NonBlocking not available"); |
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304 |
} |
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305 |
} |
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306 |
|
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307 |
// set the seed |
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308 |
@Override |
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309 |
protected void engineSetSeed(byte[] seed) { |
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310 |
INSTANCE.implSetSeed(seed); |
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311 |
} |
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312 |
|
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313 |
// get pseudo random bytes |
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314 |
@Override |
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315 |
protected void engineNextBytes(byte[] bytes) { |
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316 |
INSTANCE.implNextBytes(bytes); |
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317 |
} |
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318 |
|
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319 |
// get true random bytes |
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320 |
@Override |
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321 |
protected byte[] engineGenerateSeed(int numBytes) { |
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322 |
return INSTANCE.implGenerateSeed(numBytes); |
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323 |
} |
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324 |
} |
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325 |
|
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326 |
/** |
2 | 327 |
* Nested class doing the actual work. Singleton, see INSTANCE above. |
328 |
*/ |
|
329 |
private static class RandomIO { |
|
330 |
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331 |
// we buffer data we read from the "next" file for efficiency, |
2 | 332 |
// but we limit the lifetime to avoid using stale bits |
333 |
// lifetime in ms, currently 100 ms (0.1 s) |
|
334 |
private final static long MAX_BUFFER_TIME = 100; |
|
335 |
||
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336 |
// size of the "next" buffer |
2 | 337 |
private final static int BUFFER_SIZE = 32; |
338 |
||
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339 |
// Holder for the seedFile. Used if we ever add seed material. |
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340 |
File seedFile; |
2 | 341 |
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342 |
// In/OutputStream for "seed" and "next" |
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343 |
private final InputStream seedIn, nextIn; |
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344 |
private OutputStream seedOut; |
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345 |
|
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346 |
// flag indicating if we have tried to open seedOut yet |
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347 |
private boolean seedOutInitialized; |
2 | 348 |
|
349 |
// SHA1PRNG instance for mixing |
|
350 |
// initialized lazily on demand to avoid problems during startup |
|
351 |
private volatile sun.security.provider.SecureRandom mixRandom; |
|
352 |
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353 |
// buffer for next bits |
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354 |
private final byte[] nextBuffer; |
2 | 355 |
|
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356 |
// number of bytes left in nextBuffer |
2 | 357 |
private int buffered; |
358 |
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359 |
// time we read the data into the nextBuffer |
2 | 360 |
private long lastRead; |
361 |
||
362 |
// mutex lock for nextBytes() |
|
363 |
private final Object LOCK_GET_BYTES = new Object(); |
|
364 |
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365 |
// mutex lock for generateSeed() |
2 | 366 |
private final Object LOCK_GET_SEED = new Object(); |
367 |
||
368 |
// mutex lock for setSeed() |
|
369 |
private final Object LOCK_SET_SEED = new Object(); |
|
370 |
||
371 |
// constructor, called only once from initIO() |
|
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372 |
private RandomIO(File seedFile, File nextFile) throws IOException { |
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373 |
this.seedFile = seedFile; |
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374 |
seedIn = FileInputStreamPool.getInputStream(seedFile); |
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375 |
nextIn = FileInputStreamPool.getInputStream(nextFile); |
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376 |
nextBuffer = new byte[BUFFER_SIZE]; |
2 | 377 |
} |
378 |
||
379 |
// get the SHA1PRNG for mixing |
|
380 |
// initialize if not yet created |
|
381 |
private sun.security.provider.SecureRandom getMixRandom() { |
|
382 |
sun.security.provider.SecureRandom r = mixRandom; |
|
383 |
if (r == null) { |
|
384 |
synchronized (LOCK_GET_BYTES) { |
|
385 |
r = mixRandom; |
|
386 |
if (r == null) { |
|
387 |
r = new sun.security.provider.SecureRandom(); |
|
388 |
try { |
|
389 |
byte[] b = new byte[20]; |
|
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390 |
readFully(nextIn, b); |
2 | 391 |
r.engineSetSeed(b); |
392 |
} catch (IOException e) { |
|
393 |
throw new ProviderException("init failed", e); |
|
394 |
} |
|
395 |
mixRandom = r; |
|
396 |
} |
|
397 |
} |
|
398 |
} |
|
399 |
return r; |
|
400 |
} |
|
401 |
||
402 |
// read data.length bytes from in |
|
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403 |
// These are not normal files, so we need to loop the read. |
2 | 404 |
// just keep trying as long as we are making progress |
405 |
private static void readFully(InputStream in, byte[] data) |
|
406 |
throws IOException { |
|
407 |
int len = data.length; |
|
408 |
int ofs = 0; |
|
409 |
while (len > 0) { |
|
410 |
int k = in.read(data, ofs, len); |
|
411 |
if (k <= 0) { |
|
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412 |
throw new EOFException("File(s) closed?"); |
2 | 413 |
} |
414 |
ofs += k; |
|
415 |
len -= k; |
|
416 |
} |
|
417 |
if (len > 0) { |
|
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|
418 |
throw new IOException("Could not read from file(s)"); |
2 | 419 |
} |
420 |
} |
|
421 |
||
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422 |
// get true random bytes, just read from "seed" |
2 | 423 |
private byte[] implGenerateSeed(int numBytes) { |
424 |
synchronized (LOCK_GET_SEED) { |
|
425 |
try { |
|
426 |
byte[] b = new byte[numBytes]; |
|
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|
427 |
readFully(seedIn, b); |
2 | 428 |
return b; |
429 |
} catch (IOException e) { |
|
430 |
throw new ProviderException("generateSeed() failed", e); |
|
431 |
} |
|
432 |
} |
|
433 |
} |
|
434 |
||
435 |
// supply random bytes to the OS |
|
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436 |
// write to "seed" if possible |
2 | 437 |
// always add the seed to our mixing random |
438 |
private void implSetSeed(byte[] seed) { |
|
439 |
synchronized (LOCK_SET_SEED) { |
|
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440 |
if (seedOutInitialized == false) { |
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441 |
seedOutInitialized = true; |
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442 |
seedOut = AccessController.doPrivileged( |
2 | 443 |
new PrivilegedAction<OutputStream>() { |
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444 |
@Override |
2 | 445 |
public OutputStream run() { |
446 |
try { |
|
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447 |
return new FileOutputStream(seedFile, true); |
2 | 448 |
} catch (Exception e) { |
449 |
return null; |
|
450 |
} |
|
451 |
} |
|
452 |
}); |
|
453 |
} |
|
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454 |
if (seedOut != null) { |
2 | 455 |
try { |
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|
456 |
seedOut.write(seed); |
2 | 457 |
} catch (IOException e) { |
458 |
throw new ProviderException("setSeed() failed", e); |
|
459 |
} |
|
460 |
} |
|
461 |
getMixRandom().engineSetSeed(seed); |
|
462 |
} |
|
463 |
} |
|
464 |
||
465 |
// ensure that there is at least one valid byte in the buffer |
|
466 |
// if not, read new bytes |
|
467 |
private void ensureBufferValid() throws IOException { |
|
468 |
long time = System.currentTimeMillis(); |
|
469 |
if ((buffered > 0) && (time - lastRead < MAX_BUFFER_TIME)) { |
|
470 |
return; |
|
471 |
} |
|
472 |
lastRead = time; |
|
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|
473 |
readFully(nextIn, nextBuffer); |
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|
474 |
buffered = nextBuffer.length; |
2 | 475 |
} |
476 |
||
477 |
// get pseudo random bytes |
|
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|
478 |
// read from "next" and XOR with bytes generated by the |
2 | 479 |
// mixing SHA1PRNG |
480 |
private void implNextBytes(byte[] data) { |
|
481 |
synchronized (LOCK_GET_BYTES) { |
|
482 |
try { |
|
483 |
getMixRandom().engineNextBytes(data); |
|
484 |
int len = data.length; |
|
485 |
int ofs = 0; |
|
486 |
while (len > 0) { |
|
487 |
ensureBufferValid(); |
|
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|
488 |
int bufferOfs = nextBuffer.length - buffered; |
2 | 489 |
while ((len > 0) && (buffered > 0)) { |
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|
490 |
data[ofs++] ^= nextBuffer[bufferOfs++]; |
2 | 491 |
len--; |
492 |
buffered--; |
|
493 |
} |
|
494 |
} |
|
495 |
} catch (IOException e) { |
|
496 |
throw new ProviderException("nextBytes() failed", e); |
|
497 |
} |
|
498 |
} |
|
499 |
} |
|
500 |
} |
|
501 |
} |