72 lines
3.4 KiB
Java
72 lines
3.4 KiB
Java
/*
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* Copyright 2013, 2014 Megion Research and Development GmbH
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*
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* Licensed under the Microsoft Reference Source License (MS-RSL)
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*
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* This license governs use of the accompanying software. If you use the software, you accept this license.
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* If you do not accept the license, do not use the software.
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*
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* 1. Definitions
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* The terms "reproduce," "reproduction," and "distribution" have the same meaning here as under U.S. copyright law.
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* "You" means the licensee of the software.
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* "Your company" means the company you worked for when you downloaded the software.
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* "Reference use" means use of the software within your company as a reference, in read only form, for the sole purposes
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* of debugging your products, maintaining your products, or enhancing the interoperability of your products with the
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* software, and specifically excludes the right to distribute the software outside of your company.
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* "Licensed patents" means any Licensor patent claims which read directly on the software as distributed by the Licensor
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* under this license.
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*
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* 2. Grant of Rights
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* (A) Copyright Grant- Subject to the terms of this license, the Licensor grants you a non-transferable, non-exclusive,
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* worldwide, royalty-free copyright license to reproduce the software for reference use.
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* (B) Patent Grant- Subject to the terms of this license, the Licensor grants you a non-transferable, non-exclusive,
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* worldwide, royalty-free patent license under licensed patents for reference use.
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*
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* 3. Limitations
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* (A) No Trademark License- This license does not grant you any rights to use the Licensor’s name, logo, or trademarks.
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* (B) If you begin patent litigation against the Licensor over patents that you think may apply to the software
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* (including a cross-claim or counterclaim in a lawsuit), your license to the software ends automatically.
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* (C) The software is licensed "as-is." You bear the risk of using it. The Licensor gives no express warranties,
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* guarantees or conditions. You may have additional consumer rights under your local laws which this license cannot
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* change. To the extent permitted under your local laws, the Licensor excludes the implied warranties of merchantability,
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* fitness for a particular purpose and non-infringement.
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*/
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package de.bitsharesmunich.graphenej.crypto;
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import java.io.DataInputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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public class AndroidRandomSource implements RandomSource, EntropySource {
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@Override
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public synchronized void nextBytes(byte[] bytes) {
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// On Android we use /dev/urandom for providing random data
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File file = new File("/dev/urandom");
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if (!file.exists()) {
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throw new RuntimeException("Unable to generate random bytes on this Android device");
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}
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try {
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FileInputStream stream = new FileInputStream(file);
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DataInputStream dis = new DataInputStream(stream);
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dis.readFully(bytes);
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dis.close();
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} catch (IOException e) {
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throw new RuntimeException("Unable to generate random bytes on this Android device", e);
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}
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}
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@Override
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public ByteBuffer provideEntropy() {
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byte[] buffer = new byte[ 256 / 8];
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nextBytes(buffer);
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ByteBuffer byteBuffer = ByteBuffer.allocate(buffer.length);
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byteBuffer.put(buffer, 0, buffer.length);
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return byteBuffer;
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}
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}
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