134 lines
3.6 KiB
Java
134 lines
3.6 KiB
Java
/* WolfCryptRandom.java
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*
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* Copyright (C) 2006-2025 wolfSSL Inc.
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*
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* This file is part of wolfSSL.
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*
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* wolfSSL is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* wolfSSL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
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*/
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package com.wolfssl.provider.jce;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.io.IOException;
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import java.security.SecureRandomSpi;
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import com.wolfssl.wolfcrypt.Rng;
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import com.wolfssl.provider.jce.WolfCryptDebug;
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/**
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* wolfCrypt JCE RNG/SecureRandom wrapper
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*/
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public final class WolfCryptRandom extends SecureRandomSpi {
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private static final long serialVersionUID = 1L;
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/** Internal reference to wolfCrypt JNI RNG object.
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* Marked as transient since this is not serializable. When class
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* is reloaded, this object will be initialized back to null. */
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private transient Rng rng = null;
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/**
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* Create new WolfCryptRandom object
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*/
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public WolfCryptRandom() {
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this.rng = new Rng();
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this.rng.init();
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log("initialized new object");
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}
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@Override
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protected byte[] engineGenerateSeed(int numBytes) {
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return rng.generateBlock(numBytes);
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}
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@Override
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protected void engineNextBytes(byte[] bytes) {
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rng.generateBlock(bytes);
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}
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@Override
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protected void engineSetSeed(byte[] seed) {
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/* wolfCrypt reseeds internally automatically */
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log("setSeed() not supported by wolfJCE");
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}
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private void log(String msg) {
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WolfCryptDebug.print("[Random] " + msg);
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}
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@SuppressWarnings("deprecation")
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@Override
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protected void finalize() throws Throwable {
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try {
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if (this.rng != null) {
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this.rng.free();
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this.rng.releaseNativeStruct();
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}
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} finally {
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super.finalize();
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}
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}
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/**
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* Called when object is being serialized.
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*
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* Since Rng class variable is transient, we want to free that memory
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* before serializaing.
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*
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* @param out output stream written to during serialization of this object
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*
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* @throws IOException on error writing to ObjectOutputStream
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*/
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private void writeObject(ObjectOutputStream out) throws IOException {
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if (this.rng != null) {
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this.rng.free();
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this.rng.releaseNativeStruct();
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this.rng = null;
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}
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out.defaultWriteObject();
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}
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/**
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* Called when object is being deserialized.
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*
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* When loading back in, we want to instantiate the Rng class variable
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* again.
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*
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* @param in input stream read during deserialization of this object
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* @throws IOException on error reading from ObjectInputStream
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* @throws ClassNotFoundException if object class not found
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*/
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private void readObject(ObjectInputStream in)
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throws IOException, ClassNotFoundException {
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if (rng == null) {
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this.rng = new Rng();
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this.rng.init();
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}
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in.defaultReadObject();
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}
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}
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