/*
* @(#)NativeSeedGenerator.java 1.6 06/10/10
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
package sun.security.provider;
import java.io.IOException;
/**
* Seed generator for Windows making use of MS CryptoAPI using native code.
*
* @version 1.6, 10/10/06
*/
class NativeSeedGenerator extends SeedGenerator {
/**
* Create a new CryptoAPI seed generator instances.
*
* @exception IOException if CryptoAPI seeds are not available
* on this platform.
*/
NativeSeedGenerator() throws IOException {
super();
// try generating two random bytes to see if CAPI is available
if (!nativeGenerateSeed(new byte[2])) {
throw new IOException("Required native CryptoAPI features not "
+ " available on this machine");
}
}
/**
* Native method to do the actual work.
*/
private static native boolean nativeGenerateSeed(byte[] result);
void getSeedBytes(byte[] result) {
// fill array as a side effect
if (nativeGenerateSeed(result) == false) {
// should never happen if constructor check succeeds
throw new InternalError
("Unexpected CryptoAPI failure generating seed");
}
}
byte getSeedByte() {
byte[] b = new byte[1];
getSeedBytes(b);
return b[0];
}
}