01: /*
02: * Copyright 2002 Sun Microsystems, Inc. All Rights Reserved.
03: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04: *
05: * This code is free software; you can redistribute it and/or modify it
06: * under the terms of the GNU General Public License version 2 only, as
07: * published by the Free Software Foundation. Sun designates this
08: * particular file as subject to the "Classpath" exception as provided
09: * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22: * CA 95054 USA or visit www.sun.com if you need additional information or
23: * have any questions.
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: * @version 1.10, 05/05/07
34: */
35: class NativeSeedGenerator extends SeedGenerator {
36:
37: /**
38: * Create a new CryptoAPI seed generator instances.
39: *
40: * @exception IOException if CryptoAPI seeds are not available
41: * on this platform.
42: */
43: NativeSeedGenerator() throws IOException {
44: super ();
45: // try generating two random bytes to see if CAPI is available
46: if (!nativeGenerateSeed(new byte[2])) {
47: throw new IOException(
48: "Required native CryptoAPI features not "
49: + " available on this machine");
50: }
51: }
52:
53: /**
54: * Native method to do the actual work.
55: */
56: private static native boolean nativeGenerateSeed(byte[] result);
57:
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: byte getSeedByte() {
68: byte[] b = new byte[1];
69: getSeedBytes(b);
70: return b[0];
71: }
72: }
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