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