前端页面计算SHA256（模拟区块链货币挖矿过程）

技术
字数统计: 1.1k字   |   阅读时长≈ 6分钟

前端页面计算SHA256

模拟计算区块链货币的“挖矿”过程。参考课程：https://www.icourse163.org/learn/NJU-1449346161

使用了CryptoJS计算SHA256，使用bootstrap框架。

HTML

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
<body onload="onLoad()">
  <div class="container">
    <div class="line">
      <div class="label">区块: </div>
      <div class="input-group">
        <div class="input-group-prepend">
          <span class="input-group-text" id="basic-addon1">#</span>
        </div>
        <input id="block" type="number" class="form-control" placeholder="block number" aria-label="block" value="1" onchange="calc()">
      </div>
    </div>
    <div class="line">
      <div class="label">随机数: </div>
      <div class="input-group">
        <input id="random" type="number" class="form-control" placeholder="random number" aria-label="random" value="0" onchange="calc()">
      </div>
    </div>
    <div class="line" style="align-items: flex-start;">
      <div class="label">数据: </div>
      <textarea id="data" class="form-control" aria-label="With textarea" style="min-height: 150px;" onchange="calc()"></textarea>
    </div>
    <div class="line">
      <div class="label">SHA256: </div>
      <div class="input-group">
        <textarea id="hash" type="text" class="form-control" placeholder="hash number" aria-label="hash" disabled="true" style="word-break:break-all;word-wrap:break-all;resize:unset;"></textarea>
      </div>
    </div>
    <div class="line">
      <div class="label">前几位为0？</div>
      <div class="input-group">
        <input id="int" type="number" class="form-control" placeholder="int" aria-label="int" value="3">
      </div>
    </div>
    <div class="btn-area">
      <button id="btn" onclick="start()" type="button" class="btn btn-success">Start!</button>
    </div>
  </div>
</body>

CSS

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
.container {
  height: auto;
  min-width: 420px;
  background-color: rgba(226, 240, 220, 200);
  margin-top: 4rem;
  margin-bottom: 4rem;
  border-radius: 5px;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
}

.line {
  width: 95%;
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  margin-top: 15px;
}

.label {
  width: 100px;
  margin-right: 10px;
  text-align: right;
}

.btn-area {
  width: 90%;
  display: flex;
  flex-direction: row;
  justify-content: left;
  align-items: center;
  margin-top: 15px;
  margin-bottom: 20px;
}

JS

格式化的字符串为：block=${block};random=${random};data=${data}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
var block = 1;
var random = 0;
var data = "Hello World";
var int = 3;
var hash = "NULL";

function repeat(src, n) {
  return (new Array(n + 1)).join(src);
}

function writeLocal() {
  json = `{"block": "${block}", "random": "${random}", "data": "${data}", "int": "${int}", "hash": "${hash}"}`;
  localStorage.calc_hash = json;
  document.getElementById('block').value = block;
  document.getElementById('random').value = random;
  document.getElementById('data').value = data;
  document.getElementById('int').value = int;
  document.getElementById('hash').value = hash;
}

function readLocal() {
  json = localStorage.calc_hash;
  if (json != null) {
    json = JSON.parse(json);
  } else {
    json = null;
  }
  console.log(json);
  return json;
}

function calc() {
  block = document.getElementById('block').value;
  random = document.getElementById('random').value;
  data = document.getElementById('data').value;
  var input = `block=${block};random=${random};data=${data}`;
  var output = CryptoJS.SHA256(input);
  hash = output.toString(CryptoJS.enc.Hex).toUpperCase();
  document.getElementById('block').value = block;
  document.getElementById('random').value = random;
  document.getElementById('data').value = data;
  document.getElementById('hash').value = hash;
}

function start() {
  block = document.getElementById('block').value;
  random = document.getElementById('random').value;
  data = document.getElementById('data').value;
  int = Number(document.getElementById('int').value);
  if (int < 2) {
    alert("取0的个数太少了！");
    int = 2;
    document.getElementById('int').value = int;
    return;
  } else if (int > 9) {
    alert("取0的个数太多了！\n你想让你的电脑燃烧吗？？");
    int = 4;
    document.getElementById('int').value = int;
    return;
  }
  random = 0;
  var now, target, input, output;
  target = repeat('0', int);
  document.getElementById('random').value = '0';
  document.getElementById('hash').value = '计算中...';
  setTimeout(() => {
    while (now != target) {
      input = `block=${block};random=${random};data=${data}`;
      output = CryptoJS.SHA256(input);
      hash = output.toString(CryptoJS.enc.Hex);
      now = hash.slice(0, int);
      console.log(now);
      random += 1;
    }
    random -= 1;
    hash = hash.toUpperCase();
    writeLocal();
  }, 500);
}

function onLoad() {
  localData = readLocal();
  if (localData != null) {
    block = localData.block;
    random = localData.random;
    data = localData.data;
    int = localData.int;
    hash = localData.hash;
    document.getElementById('block').value = block;
    document.getElementById('random').value = random;
    document.getElementById('data').value = data;
    document.getElementById('int').value = int;
    document.getElementById('hash').value = hash;
  } else {
    writeLocal();
    calc();
  }
}

CodePen 预览

https://codepen.io/irispro/full/jOrKodY

打赏
  • 版权声明： 本博客采用 Apache License 2.0 许可协议。
    转载请注明出处： https://ryzenx.com/2020/11/Front_Calc_SHA265/

谢谢你的喜欢~

支付宝
微信