区块链模子原理入门学习1——简易模子 - ToB企服应用市场:ToB评测及商务社交产业平台

1 using System;
2 using System.Collections.Generic;
3 using System.Security.Cryptography;
4 using System.Text;
5
6 namespace TestPrj
7 {
8 class Program
9 {
10 static void Main(string[] args)
11 {
12 Chain chain = new Chain();
13
14 Block block1 = new Block("转账10元");
15 chain.AddNewBlock(block1);
16 Block block2 = new Block("转账30元");
17 chain.AddNewBlock(block2);
18
19
20 //查看当前数据链总共数据快数
21 chain.ViewBlockCount();
22
23 //查看所有数据链
24 chain.ViewAllBlocks();
25
26 //验证数据链
27 Console.WriteLine(chain.Validate());
28
29 //模拟篡改数据
30 chain.Blocks[1].Prehash = "";
31
32 //验证数据链
33 Console.WriteLine(chain.Validate());
34 }
35 }
36 }
37
38 //数据块
39 public class Block
40 {
41 //数据
42 private string data;
43 //前一个Block的hash
44 private string prehash;
45 //当前Block的hash
46 private string curhash;
47 public Block(string data)
48 {
49 this.prehash = "";
50 this.data = data;
51 this.curhash = "";
52 }
53
54 //注意:这里为了模拟篡改数据专门封装的字段
55 public string Data { get => data; set => data = value; }
56 public string Prehash { get => prehash; set => prehash = value; }
57 public string Curhash { get => curhash; set => curhash = value; }
58
59 //计算当前Block的Hash
60 public string ComputeHash(string prehash)
61 {
62 this.prehash = prehash;
63 return SHA256(this.data + this.prehash);
64 }
65
66 //Hash256计算
67 public string SHA256(string str)
68 {
69 //如果str有中文，不同Encoding的sha是不同的！！
70 byte[] SHA256Data = Encoding.UTF8.GetBytes(str);
71
72 SHA256Managed Sha256 = new SHA256Managed();
73 byte[] by = Sha256.ComputeHash(SHA256Data);
74
75 return BitConverter.ToString(by).Replace("-", "").ToLower();
76 }
77
78 //显示Block数据
79 public void ViewInfo()
80 {
81 Console.WriteLine("====");
82 Console.WriteLine("[prehash]->" + this.prehash);
83 Console.WriteLine("[data]->" + this.data);
84 Console.WriteLine("[hash]->" + this.curhash);
85 }
86 }
87
88 public class Chain
89 {
90 private List<Block> blocks;
91
92 public List<Block> Blocks { get => blocks; set => blocks = value; }
93
94 public Chain()
95 {
96 this.blocks = new List<Block>();
97 Block genesisBloc = new Block("源数据块");
98 genesisBloc.Curhash = genesisBloc.ComputeHash("genesis");
99 AddNewBlock(genesisBloc);
100 }
101
102 public void ViewBlockCount()
103 {
104 Console.WriteLine("当前数据块总数->" + this.blocks.Count);
105 }
106
107 //添加Block
108 public void AddNewBlock(Block newblock)
109 {
110 //空链的情况
111 if (this.blocks.Count == 0)
112 {
113 this.blocks.Add(newblock);
114 newblock.Curhash = newblock.ComputeHash(newblock.Prehash);
115 return;
116 }
117 /*链接新Block*/
118 //新的Block的prehash是上一个block的curhash
119 newblock.Prehash = this.blocks[this.blocks.Count - 1].Curhash;
120 newblock.Curhash = newblock.ComputeHash(newblock.Prehash);
121 /*添加新Block*/
122 this.blocks.Add(newblock);
123 }
124
125 //查看所有Block
126 public void ViewAllBlocks()
127 {
128 foreach (var item in this.blocks)
129 {
130 item.ViewInfo();
131 }
132 }
133
134 //验证Chain
135 public bool Validate()
136 {
137 //无任何数据块的情况
138 if (this.blocks.Count == 0)
139 {
140 Console.WriteLine("[数据链异常]->数据链为空！");
141 return false;
142 }
143 //只有源数据块的情况
144 else if (this.blocks.Count == 1)
145 {
146 Console.WriteLine("验证完毕！");
147 return true;
148 }
149
150 //遍历校验标志
151 bool checkBlockSign = true;
152
153 //遍历检查数据块，因为不检查源数据块，下标从1开始
154 for (int checkBlockIndex = 1; checkBlockIndex < this.blocks.Count; checkBlockIndex++)
155 {
156 //检验curhash
157 var checkBlock = this.blocks[checkBlockIndex];
158 if (checkBlock.Curhash != checkBlock.ComputeHash(checkBlock.Prehash))
159 {
160 Console.WriteLine("[数据被篡改]->" + checkBlockIndex);
161 checkBlockSign = false;
162 break;
163 }
164 /* //验证prehash
165 if (checkBlock.Prehash != this.blocks[checkBlockIndex - 1].Curhash)
166 {
167 Console.WriteLine("[数据链断裂]->" + checkBlockIndex);
168 checkBlockSign = false;
169 break;
170 }*/
171 }
172 Console.WriteLine("验证完毕！");
173 return checkBlockSign;
174 }
175 }

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