mirror of https://github.com/GeyserMC/Geyser.git
75 lines
2.9 KiB
Java
75 lines
2.9 KiB
Java
/*
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* Copyright (c) 2019-2020 GeyserMC. http://geysermc.org
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @author GeyserMC
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* @link https://github.com/GeyserMC/Floodgate
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*
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*/
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package org.geysermc.floodgate.crypto;
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import javax.crypto.KeyGenerator;
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import javax.crypto.SecretKey;
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import javax.crypto.spec.SecretKeySpec;
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import java.security.NoSuchAlgorithmException;
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import java.security.SecureRandom;
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public final class AesKeyProducer implements KeyProducer {
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public static int KEY_SIZE = 128;
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@Override
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public SecretKey produce() {
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try {
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KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
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keyGenerator.init(KEY_SIZE, secureRandom());
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return keyGenerator.generateKey();
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} catch (Exception exception) {
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throw new RuntimeException(exception);
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}
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}
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@Override
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public SecretKey produceFrom(byte[] keyFileData) {
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try {
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return new SecretKeySpec(keyFileData, "AES");
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} catch (Exception exception) {
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throw new RuntimeException(exception);
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}
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}
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private SecureRandom secureRandom() throws NoSuchAlgorithmException {
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// use Windows-PRNG for windows (default impl is SHA1PRNG)
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if (System.getProperty("os.name").startsWith("Windows")) {
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return SecureRandom.getInstance("Windows-PRNG");
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} else {
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try {
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// NativePRNG (which should be the default on unix-systems) can still block your
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// system. Even though it isn't as bad as NativePRNGBlocking, we still try to
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// prevent that if possible
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return SecureRandom.getInstance("NativePRNGNonBlocking");
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} catch (NoSuchAlgorithmException ignored) {
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// at this point we just have to go with the default impl even if it blocks
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return new SecureRandom();
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}
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}
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}
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}
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