author | wetmore |
Thu, 11 Apr 2013 21:03:24 -0700 | |
changeset 16915 | 675d1569af3e |
parent 7546 | c1915029b924 |
permissions | -rw-r--r-- |
2 | 1 |
/* |
16915
675d1569af3e
6425477: Better support for generation of high entropy random numbers
wetmore
parents:
7546
diff
changeset
|
2 |
* Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved. |
2 | 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 |
|
5506 | 7 |
* published by the Free Software Foundation. Oracle designates this |
2 | 8 |
* particular file as subject to the "Classpath" exception as provided |
5506 | 9 |
* by Oracle in the LICENSE file that accompanied this code. |
2 | 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 |
* |
|
5506 | 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. |
|
2 | 24 |
*/ |
25 |
||
26 |
package sun.security.provider; |
|
27 |
||
28 |
import java.io.IOException; |
|
29 |
||
30 |
/** |
|
31 |
* Seed generator for Windows making use of MS CryptoAPI using native code. |
|
32 |
* |
|
33 |
*/ |
|
34 |
class NativeSeedGenerator extends SeedGenerator { |
|
35 |
||
36 |
/** |
|
37 |
* Create a new CryptoAPI seed generator instances. |
|
38 |
* |
|
39 |
* @exception IOException if CryptoAPI seeds are not available |
|
40 |
* on this platform. |
|
41 |
*/ |
|
16915
675d1569af3e
6425477: Better support for generation of high entropy random numbers
wetmore
parents:
7546
diff
changeset
|
42 |
NativeSeedGenerator(String seedFile) throws IOException { |
675d1569af3e
6425477: Better support for generation of high entropy random numbers
wetmore
parents:
7546
diff
changeset
|
43 |
// seedFile is ignored. |
2 | 44 |
super(); |
45 |
// try generating two random bytes to see if CAPI is available |
|
46 |
if (!nativeGenerateSeed(new byte[2])) { |
|
47 |
throw new IOException("Required native CryptoAPI features not " |
|
48 |
+ " available on this machine"); |
|
49 |
} |
|
50 |
} |
|
51 |
||
52 |
/** |
|
53 |
* Native method to do the actual work. |
|
54 |
*/ |
|
55 |
private static native boolean nativeGenerateSeed(byte[] result); |
|
56 |
||
7546
c1915029b924
6998583: NativeSeedGenerator is making 8192 byte read requests from entropy pool on each init.
coffeys
parents:
5506
diff
changeset
|
57 |
@Override |
2 | 58 |
void getSeedBytes(byte[] result) { |
59 |
// fill array as a side effect |
|
60 |
if (nativeGenerateSeed(result) == false) { |
|
61 |
// should never happen if constructor check succeeds |
|
62 |
throw new InternalError |
|
63 |
("Unexpected CryptoAPI failure generating seed"); |
|
64 |
} |
|
65 |
} |
|
66 |
||
67 |
} |