111 lines
3.0 KiB
Java
111 lines
3.0 KiB
Java
/* Rng.java
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*
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* Copyright (C) 2006-2016 wolfSSL Inc.
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*
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* This file is part of wolfSSL. (formerly known as CyaSSL)
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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 02110-1301, USA
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*/
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package com.wolfssl.wolfcrypt;
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import java.nio.ByteBuffer;
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import javax.crypto.ShortBufferException;
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/**
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* Wrapper for the native WolfCrypt Rng implementation.
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*
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* @author Moisés Guimarães
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* @version 1.0, March 2015
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*/
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public class Rng extends NativeStruct {
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protected native long mallocNativeStruct() throws OutOfMemoryError;
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private WolfCryptState state = WolfCryptState.UNINITIALIZED;
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/* native wrappers called by public functions below */
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private native void initRng();
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private native void freeRng();
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private native void rngGenerateBlock(ByteBuffer buf, int position, int sz);
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private native void rngGenerateBlock(byte[] buf);
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public void init() {
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if (state == WolfCryptState.UNINITIALIZED) {
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initRng();
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state = WolfCryptState.INITIALIZED;
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} else {
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throw new IllegalStateException(
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"Object has already been initialized");
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}
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}
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public void free() {
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if (state == WolfCryptState.INITIALIZED) {
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freeRng();
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state = WolfCryptState.UNINITIALIZED;
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} else {
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throw new IllegalStateException(
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"Object has been freed");
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}
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}
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public void generateBlock(ByteBuffer buf) {
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if (state == WolfCryptState.INITIALIZED) {
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rngGenerateBlock(buf, buf.position(), buf.remaining());
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buf.position(buf.position() + buf.remaining());
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} else {
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throw new IllegalStateException(
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"Object must be initialized before use");
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}
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}
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public void generateBlock(byte[] buf) {
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if (state == WolfCryptState.INITIALIZED) {
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rngGenerateBlock(buf);
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} else {
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throw new IllegalStateException(
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"Object must be initialized before use");
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}
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}
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public byte[] generateBlock(int size) {
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if (state == WolfCryptState.INITIALIZED) {
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byte[] buffer = new byte[size];
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rngGenerateBlock(buffer);
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return buffer;
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} else {
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throw new IllegalStateException(
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"Object must be initialized before use");
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}
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}
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}
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