0N/A/*
2362N/A * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
2362N/A * published by the Free Software Foundation. Oracle designates this
0N/A * particular file as subject to the "Classpath" exception as provided
2362N/A * by Oracle in the LICENSE file that accompanied this code.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
0N/A *
2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
2362N/A * or visit www.oracle.com if you need additional information or have any
2362N/A * questions.
0N/A */
0N/A
0N/Apackage sun.security.mscapi;
0N/A
0N/Aimport java.security.ProviderException;
0N/Aimport java.security.SecureRandomSpi;
0N/A
0N/A/**
0N/A * Native PRNG implementation for Windows using the Microsoft Crypto API.
0N/A *
0N/A * @since 1.6
0N/A */
0N/A
0N/Apublic final class PRNG extends SecureRandomSpi
0N/A implements java.io.Serializable {
0N/A
0N/A // TODO - generate the serialVersionUID
0N/A //private static final long serialVersionUID = XXX;
0N/A
0N/A /*
0N/A * The CryptGenRandom function fills a buffer with cryptographically random
0N/A * bytes.
0N/A */
0N/A private static native byte[] generateSeed(int length, byte[] seed);
0N/A
0N/A /**
0N/A * Creates a random number generator.
0N/A */
0N/A public PRNG() {
0N/A }
0N/A
0N/A /**
0N/A * Reseeds this random object. The given seed supplements, rather than
0N/A * replaces, the existing seed. Thus, repeated calls are guaranteed
0N/A * never to reduce randomness.
0N/A *
0N/A * @param seed the seed.
0N/A */
0N/A protected void engineSetSeed(byte[] seed) {
0N/A if (seed != null) {
0N/A generateSeed(-1, seed);
0N/A }
0N/A }
0N/A
0N/A /**
0N/A * Generates a user-specified number of random bytes.
0N/A *
0N/A * @param bytes the array to be filled in with random bytes.
0N/A */
0N/A protected void engineNextBytes(byte[] bytes) {
0N/A if (bytes != null) {
0N/A if (generateSeed(0, bytes) == null) {
0N/A throw new ProviderException("Error generating random bytes");
0N/A }
0N/A }
0N/A }
0N/A
0N/A /**
0N/A * Returns the given number of seed bytes. This call may be used to
0N/A * seed other random number generators.
0N/A *
0N/A * @param numBytes the number of seed bytes to generate.
0N/A *
0N/A * @return the seed bytes.
0N/A */
0N/A protected byte[] engineGenerateSeed(int numBytes) {
0N/A byte[] seed = generateSeed(numBytes, null);
0N/A
0N/A if (seed == null) {
0N/A throw new ProviderException("Error generating seed bytes");
0N/A }
0N/A return seed;
0N/A }
0N/A}