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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 difficulty;
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17
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18 private long number;
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19
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20 private long timestamp;
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21
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22 private long nonce;
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23
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24 HashUtil hashUtil = new HashUtil();
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25
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26 public BlockHeader(byte[] parentHash, long difficulty, long number, long timestamp) {
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27 this.parentHash = parentHash;
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28 this.difficulty = difficulty;
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29 this.number = number;
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30 this.timestamp = timestamp;
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31 }
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32
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33 public byte[] getParamByteArray(boolean withNonce){
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34
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35 ByteArrayOutputStream output = new ByteArrayOutputStream();
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36
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37 byte[] timestampByte = BigInteger.valueOf(this.timestamp).toByteArray();
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38
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39 try {
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40 output.write(parentHash);
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41 output.write(timestampByte);
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42 } catch (IOException e) {
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43 e.printStackTrace();
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44 }
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45
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46 if(withNonce){
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47 byte[] nonceByte = BigInteger.valueOf(this.nonce).toByteArray();
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48 try {
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49 output.write(nonceByte);
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50 } catch (IOException e) {
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51 e.printStackTrace();
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52 }
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53 }
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54
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55 return output.toByteArray();
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56
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57 }
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58
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59 public byte[] getParentHash() {
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60
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61 return parentHash;
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62 }
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63
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64 public byte[] getPresentHash() {
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65
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66 return hashUtil.sha256(getParamByteArray(true));
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67 }
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68
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69 public byte[] getByteArrayWithoutNonce(){
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70
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71 return getParamByteArray(false);
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72 }
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73
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74 public void setTimestamp(long timestamp) {
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75 this.timestamp = timestamp;
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76 }
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77
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78 public long getTimestamp() {
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79 return timestamp;
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80 }
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81
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82 public void setNonce(long nonce) {
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83 this.nonce = nonce;
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84 }
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85
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86 public long getNonce(){
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87 return this.nonce;
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88 }
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89
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90 public void setNumber(long number) {
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91 this.number = number;
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92 }
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93
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94 public long getNumber() {
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95 return number;
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96 }
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97
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98 public void setDifficulty(long difficulty) {
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99 this.difficulty = difficulty;
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100 }
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101
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102 public long getDifficulty() {
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103 return difficulty;
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104 }
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105 }
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