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1 package christie.blockchain;
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2
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3 import org.bouncycastle.util.BigIntegers;
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4
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5 import java.io.ByteArrayOutputStream;
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6 import java.io.IOException;
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7 import java.math.BigInteger;
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8 import java.nio.charset.Charset;
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9
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10 public class BlockHeader {
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11
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12 private byte[] presentHash;
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13
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14 private byte[] parentHash;
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15
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16 private long timestamp;
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17
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18 private long nonce;
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19
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20 HashUtil hashUtil = new HashUtil();
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21
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22 public BlockHeader(byte[] parentHash, long timestamp) {
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23 this.parentHash = parentHash;
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24 this.timestamp = timestamp;
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25 }
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26
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27 public byte[] getHash(boolean withNonce){
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28
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29 ByteArrayOutputStream output = new ByteArrayOutputStream();
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30
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31 byte[] timestampByte = BigInteger.valueOf(this.timestamp).toByteArray();
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32
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33 try {
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34 output.write(parentHash);
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35 output.write(timestampByte);
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36 } catch (IOException e) {
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37 e.printStackTrace();
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38 }
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39
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40 if(withNonce){
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41 byte[] nonceByte = BigInteger.valueOf(this.nonce).toByteArray();
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42 try {
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43 output.write(nonceByte);
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44 } catch (IOException e) {
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45 e.printStackTrace();
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46 }
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47 }
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48
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49 return output.toByteArray();
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50
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51 }
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52
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53 public byte[] getParentHash() {
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54 return parentHash;
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55 }
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56
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57 public byte[] getPresentHash() {
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58 return hashUtil.sha256(getHash(true));
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59 }
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60
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61 public byte[] getPresentHashWithoutNonce(){
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62 return getHash(false);
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63 }
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64
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65 public long getTimestamp() {
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66 return timestamp;
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67 }
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68
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69 public void setTimestamp(long timestamp) {
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70 this.timestamp = timestamp;
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71 }
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72
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73 public void setNonce(long nonce) { this.nonce = nonce; }
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74
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75 public long getNonce(){
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76 return this.nonce;
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77 }
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78
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79 }
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