46 lines
1.5 KiB
Java
46 lines
1.5 KiB
Java
/*
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* Copyright 2015 Christian Basler
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package ch.dissem.bitmessage.ports;
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import ch.dissem.bitmessage.utils.Bytes;
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import java.security.MessageDigest;
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import static ch.dissem.bitmessage.utils.Bytes.inc;
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/**
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* You should really use the MultiThreadedPOWEngine, but this one might help you grok the other one.
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*/
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public class SimplePOWEngine implements ProofOfWorkEngine {
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@Override
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public void calculateNonce(byte[] initialHash, byte[] target, Callback callback) {
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byte[] nonce = new byte[8];
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MessageDigest mda;
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try {
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mda = MessageDigest.getInstance("SHA-512");
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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do {
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inc(nonce);
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mda.update(nonce);
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mda.update(initialHash);
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} while (Bytes.lt(target, mda.digest(mda.digest()), 8));
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callback.onNonceCalculated(initialHash, nonce);
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}
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}
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